xref: /aosp_15_r20/external/wuffs-mirror-release-c/release/c/wuffs-v0.2.c (revision 30889fd3ad667d11ca7a90e9af352e217875dd23)

#ifndef WUFFS_INCLUDE_GUARD
#define WUFFS_INCLUDE_GUARD

// Wuffs ships as a "single file C library" or "header file library" as per
// https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
//
// To use that single file as a "foo.c"-like implementation, instead of a
// "foo.h"-like header, #define WUFFS_IMPLEMENTATION before #include'ing or
// compiling it.

// Copyright 2017 The Wuffs Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <stdbool.h>
#include <stdint.h>
#include <string.h>

// GCC does not warn for unused *static inline* functions, but clang does.
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-function"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// Wuffs assumes that:
//  - converting a uint32_t to a size_t will never overflow.
//  - converting a size_t to a uint64_t will never overflow.
#ifdef __WORDSIZE
#if (__WORDSIZE != 32) && (__WORDSIZE != 64)
#error "Wuffs requires a word size of either 32 or 64 bits"
#endif
#endif

// WUFFS_VERSION is the major.minor.patch version, as per https://semver.org/,
// as a uint64_t. The major number is the high 32 bits. The minor number is the
// middle 16 bits. The patch number is the low 16 bits. The pre-release label
// and build metadata are part of the string representation (such as
// "1.2.3-beta+456.20181231") but not the uint64_t representation.
//
// WUFFS_VERSION_PRE_RELEASE_LABEL (such as "", "beta" or "rc.1") being
// non-empty denotes a developer preview, not a release version, and has no
// backwards or forwards compatibility guarantees.
//
// WUFFS_VERSION_BUILD_METADATA_XXX, if non-zero, are the number of commits and
// the last commit date in the repository used to build this library. Within
// each major.minor branch, the commit count should increase monotonically.
//
// WUFFS_VERSION was overridden by "wuffs gen -version" based on revision
// b36c9f019f2908639b0bb4dd5b8337bb3daf3271 committed on 2019-12-19.
#define WUFFS_VERSION ((uint64_t)0x0000000000020000)
#define WUFFS_VERSION_MAJOR ((uint64_t)0x00000000)
#define WUFFS_VERSION_MINOR ((uint64_t)0x0002)
#define WUFFS_VERSION_PATCH ((uint64_t)0x0000)
#define WUFFS_VERSION_PRE_RELEASE_LABEL ""
#define WUFFS_VERSION_BUILD_METADATA_COMMIT_COUNT 2078
#define WUFFS_VERSION_BUILD_METADATA_COMMIT_DATE 20191219
#define WUFFS_VERSION_STRING "0.2.0+2078.20191219"

// Define WUFFS_CONFIG__STATIC_FUNCTIONS to make all of Wuffs' functions have
// static storage. The motivation is discussed in the "ALLOW STATIC
// IMPLEMENTATION" section of
// https://raw.githubusercontent.com/nothings/stb/master/docs/stb_howto.txt
#ifdef WUFFS_CONFIG__STATIC_FUNCTIONS
#define WUFFS_BASE__MAYBE_STATIC static
#else
#define WUFFS_BASE__MAYBE_STATIC
#endif

#if defined(__clang__)
#define WUFFS_BASE__POTENTIALLY_UNUSED_FIELD __attribute__((unused))
#else
#define WUFFS_BASE__POTENTIALLY_UNUSED_FIELD
#endif

// Clang also defines "__GNUC__".
#if defined(__GNUC__)
#define WUFFS_BASE__POTENTIALLY_UNUSED __attribute__((unused))
#define WUFFS_BASE__WARN_UNUSED_RESULT __attribute__((warn_unused_result))
#else
#define WUFFS_BASE__POTENTIALLY_UNUSED
#define WUFFS_BASE__WARN_UNUSED_RESULT
#endif

// Flags for wuffs_foo__bar__initialize functions.

#define WUFFS_INITIALIZE__DEFAULT_OPTIONS ((uint32_t)0x00000000)

// WUFFS_INITIALIZE__ALREADY_ZEROED means that the "self" receiver struct value
// has already been set to all zeroes.
#define WUFFS_INITIALIZE__ALREADY_ZEROED ((uint32_t)0x00000001)

// WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED means that, absent
// WUFFS_INITIALIZE__ALREADY_ZEROED, only some of the "self" receiver struct
// value will be set to all zeroes. Internal buffers, which tend to be a large
// proportion of the struct's size, will be left uninitialized. Internal means
// that the buffer is contained by the receiver struct, as opposed to being
// passed as a separately allocated "work buffer".
//
// For more detail, see:
// https://github.com/google/wuffs/blob/master/doc/note/initialization.md
#define WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED \
  ((uint32_t)0x00000002)

// --------

// wuffs_base__empty_struct is used when a Wuffs function returns an empty
// struct. In C, if a function f returns void, you can't say "x = f()", but in
// Wuffs, if a function g returns empty, you can say "y = g()".
typedef struct {
  // private_impl is a placeholder field. It isn't explicitly used, except that
  // without it, the sizeof a struct with no fields can differ across C/C++
  // compilers, and it is undefined behavior in C99. For example, gcc says that
  // the sizeof an empty struct is 0, and g++ says that it is 1. This leads to
  // ABI incompatibility if a Wuffs .c file is processed by one compiler and
  // its .h file with another compiler.
  //
  // Instead, we explicitly insert an otherwise unused field, so that the
  // sizeof this struct is always 1.
  uint8_t private_impl;
} wuffs_base__empty_struct;

static inline wuffs_base__empty_struct  //
wuffs_base__make_empty_struct() {
  wuffs_base__empty_struct ret;
  ret.private_impl = 0;
  return ret;
}

// wuffs_base__utility is a placeholder receiver type. It enables what Java
// calls static methods, as opposed to regular methods.
typedef struct {
  // private_impl is a placeholder field. It isn't explicitly used, except that
  // without it, the sizeof a struct with no fields can differ across C/C++
  // compilers, and it is undefined behavior in C99. For example, gcc says that
  // the sizeof an empty struct is 0, and g++ says that it is 1. This leads to
  // ABI incompatibility if a Wuffs .c file is processed by one compiler and
  // its .h file with another compiler.
  //
  // Instead, we explicitly insert an otherwise unused field, so that the
  // sizeof this struct is always 1.
  uint8_t private_impl;
} wuffs_base__utility;

// --------

// See https://github.com/google/wuffs/blob/master/doc/note/statuses.md
typedef const char* wuffs_base__status;

extern const char* wuffs_base__warning__end_of_data;
extern const char* wuffs_base__warning__metadata_reported;
extern const char* wuffs_base__suspension__short_read;
extern const char* wuffs_base__suspension__short_write;
extern const char* wuffs_base__error__bad_i_o_position;
extern const char* wuffs_base__error__bad_argument_length_too_short;
extern const char* wuffs_base__error__bad_argument;
extern const char* wuffs_base__error__bad_call_sequence;
extern const char* wuffs_base__error__bad_receiver;
extern const char* wuffs_base__error__bad_restart;
extern const char* wuffs_base__error__bad_sizeof_receiver;
extern const char* wuffs_base__error__bad_workbuf_length;
extern const char* wuffs_base__error__bad_wuffs_version;
extern const char* wuffs_base__error__cannot_return_a_suspension;
extern const char* wuffs_base__error__disabled_by_previous_error;
extern const char* wuffs_base__error__initialize_falsely_claimed_already_zeroed;
extern const char* wuffs_base__error__initialize_not_called;
extern const char* wuffs_base__error__interleaved_coroutine_calls;
extern const char* wuffs_base__error__not_enough_data;
extern const char* wuffs_base__error__unsupported_option;
extern const char* wuffs_base__error__too_much_data;

static inline bool  //
wuffs_base__status__is_complete(wuffs_base__status z) {
  return (z == NULL) || ((*z != '$') && (*z != '#'));
}

static inline bool  //
wuffs_base__status__is_error(wuffs_base__status z) {
  return z && (*z == '#');
}

static inline bool  //
wuffs_base__status__is_ok(wuffs_base__status z) {
  return z == NULL;
}

static inline bool  //
wuffs_base__status__is_suspension(wuffs_base__status z) {
  return z && (*z == '$');
}

static inline bool  //
wuffs_base__status__is_warning(wuffs_base__status z) {
  return z && (*z != '$') && (*z != '#');
}

// wuffs_base__status__message strips the leading '$', '#' or '@'.
static inline const char*  //
wuffs_base__status__message(wuffs_base__status z) {
  if (z) {
    if ((*z == '$') || (*z == '#') || (*z == '@')) {
      return z + 1;
    }
  }
  return z;
}

// --------

// FourCC constants.

// International Color Consortium Profile.
#define WUFFS_BASE__FOURCC__ICCP 0x49434350

// Extensible Metadata Platform.
#define WUFFS_BASE__FOURCC__XMP 0x584D5020

// --------

// Flicks are a unit of time. One flick (frame-tick) is 1 / 705_600_000 of a
// second. See https://github.com/OculusVR/Flicks
typedef int64_t wuffs_base__flicks;

#define WUFFS_BASE__FLICKS_PER_SECOND ((uint64_t)705600000)
#define WUFFS_BASE__FLICKS_PER_MILLISECOND ((uint64_t)705600)

// ---------------- Numeric Types

static inline uint8_t  //
wuffs_base__u8__min(uint8_t x, uint8_t y) {
  return x < y ? x : y;
}

static inline uint8_t  //
wuffs_base__u8__max(uint8_t x, uint8_t y) {
  return x > y ? x : y;
}

static inline uint16_t  //
wuffs_base__u16__min(uint16_t x, uint16_t y) {
  return x < y ? x : y;
}

static inline uint16_t  //
wuffs_base__u16__max(uint16_t x, uint16_t y) {
  return x > y ? x : y;
}

static inline uint32_t  //
wuffs_base__u32__min(uint32_t x, uint32_t y) {
  return x < y ? x : y;
}

static inline uint32_t  //
wuffs_base__u32__max(uint32_t x, uint32_t y) {
  return x > y ? x : y;
}

static inline uint64_t  //
wuffs_base__u64__min(uint64_t x, uint64_t y) {
  return x < y ? x : y;
}

static inline uint64_t  //
wuffs_base__u64__max(uint64_t x, uint64_t y) {
  return x > y ? x : y;
}

// --------

// Saturating arithmetic (sat_add, sat_sub) branchless bit-twiddling algorithms
// are per https://locklessinc.com/articles/sat_arithmetic/
//
// It is important that the underlying types are unsigned integers, as signed
// integer arithmetic overflow is undefined behavior in C.

static inline uint8_t  //
wuffs_base__u8__sat_add(uint8_t x, uint8_t y) {
  uint8_t res = (uint8_t)(x + y);
  res |= (uint8_t)(-(res < x));
  return res;
}

static inline uint8_t  //
wuffs_base__u8__sat_sub(uint8_t x, uint8_t y) {
  uint8_t res = (uint8_t)(x - y);
  res &= (uint8_t)(-(res <= x));
  return res;
}

static inline uint16_t  //
wuffs_base__u16__sat_add(uint16_t x, uint16_t y) {
  uint16_t res = (uint16_t)(x + y);
  res |= (uint16_t)(-(res < x));
  return res;
}

static inline uint16_t  //
wuffs_base__u16__sat_sub(uint16_t x, uint16_t y) {
  uint16_t res = (uint16_t)(x - y);
  res &= (uint16_t)(-(res <= x));
  return res;
}

static inline uint32_t  //
wuffs_base__u32__sat_add(uint32_t x, uint32_t y) {
  uint32_t res = (uint32_t)(x + y);
  res |= (uint32_t)(-(res < x));
  return res;
}

static inline uint32_t  //
wuffs_base__u32__sat_sub(uint32_t x, uint32_t y) {
  uint32_t res = (uint32_t)(x - y);
  res &= (uint32_t)(-(res <= x));
  return res;
}

static inline uint64_t  //
wuffs_base__u64__sat_add(uint64_t x, uint64_t y) {
  uint64_t res = (uint64_t)(x + y);
  res |= (uint64_t)(-(res < x));
  return res;
}

static inline uint64_t  //
wuffs_base__u64__sat_sub(uint64_t x, uint64_t y) {
  uint64_t res = (uint64_t)(x - y);
  res &= (uint64_t)(-(res <= x));
  return res;
}

// ---------------- Slices and Tables

// WUFFS_BASE__SLICE is a 1-dimensional buffer.
//
// len measures a number of elements, not necessarily a size in bytes.
//
// A value with all fields NULL or zero is a valid, empty slice.
#define WUFFS_BASE__SLICE(T) \
  struct {                   \
    T* ptr;                  \
    size_t len;              \
  }

// WUFFS_BASE__TABLE is a 2-dimensional buffer.
//
// width height, and stride measure a number of elements, not necessarily a
// size in bytes.
//
// A value with all fields NULL or zero is a valid, empty table.
#define WUFFS_BASE__TABLE(T) \
  struct {                   \
    T* ptr;                  \
    size_t width;            \
    size_t height;           \
    size_t stride;           \
  }

typedef WUFFS_BASE__SLICE(uint8_t) wuffs_base__slice_u8;
typedef WUFFS_BASE__SLICE(uint16_t) wuffs_base__slice_u16;
typedef WUFFS_BASE__SLICE(uint32_t) wuffs_base__slice_u32;
typedef WUFFS_BASE__SLICE(uint64_t) wuffs_base__slice_u64;

typedef WUFFS_BASE__TABLE(uint8_t) wuffs_base__table_u8;
typedef WUFFS_BASE__TABLE(uint16_t) wuffs_base__table_u16;
typedef WUFFS_BASE__TABLE(uint32_t) wuffs_base__table_u32;
typedef WUFFS_BASE__TABLE(uint64_t) wuffs_base__table_u64;

static inline wuffs_base__slice_u8  //
wuffs_base__make_slice_u8(uint8_t* ptr, size_t len) {
  wuffs_base__slice_u8 ret;
  ret.ptr = ptr;
  ret.len = len;
  return ret;
}

static inline wuffs_base__slice_u16  //
wuffs_base__make_slice_u16(uint16_t* ptr, size_t len) {
  wuffs_base__slice_u16 ret;
  ret.ptr = ptr;
  ret.len = len;
  return ret;
}

static inline wuffs_base__slice_u32  //
wuffs_base__make_slice_u32(uint32_t* ptr, size_t len) {
  wuffs_base__slice_u32 ret;
  ret.ptr = ptr;
  ret.len = len;
  return ret;
}

static inline wuffs_base__slice_u64  //
wuffs_base__make_slice_u64(uint64_t* ptr, size_t len) {
  wuffs_base__slice_u64 ret;
  ret.ptr = ptr;
  ret.len = len;
  return ret;
}

static inline wuffs_base__slice_u8  //
wuffs_base__empty_slice_u8() {
  wuffs_base__slice_u8 ret;
  ret.ptr = NULL;
  ret.len = 0;
  return ret;
}

static inline wuffs_base__table_u8  //
wuffs_base__empty_table_u8() {
  wuffs_base__table_u8 ret;
  ret.ptr = NULL;
  ret.width = 0;
  ret.height = 0;
  ret.stride = 0;
  return ret;
}

// wuffs_base__slice_u8__subslice_i returns s[i:].
//
// It returns an empty slice if i is out of bounds.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__subslice_i(wuffs_base__slice_u8 s, uint64_t i) {
  if ((i <= SIZE_MAX) && (i <= s.len)) {
    return wuffs_base__make_slice_u8(s.ptr + i, s.len - i);
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

// wuffs_base__slice_u8__subslice_j returns s[:j].
//
// It returns an empty slice if j is out of bounds.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__subslice_j(wuffs_base__slice_u8 s, uint64_t j) {
  if ((j <= SIZE_MAX) && (j <= s.len)) {
    return wuffs_base__make_slice_u8(s.ptr, j);
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

// wuffs_base__slice_u8__subslice_ij returns s[i:j].
//
// It returns an empty slice if i or j is out of bounds.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__subslice_ij(wuffs_base__slice_u8 s,
                                  uint64_t i,
                                  uint64_t j) {
  if ((i <= j) && (j <= SIZE_MAX) && (j <= s.len)) {
    return wuffs_base__make_slice_u8(s.ptr + i, j - i);
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

// ---------------- Ranges and Rects

// See https://github.com/google/wuffs/blob/master/doc/note/ranges-and-rects.md

typedef struct wuffs_base__range_ii_u32__struct {
  uint32_t min_incl;
  uint32_t max_incl;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__range_ii_u32__struct s) const;
  inline wuffs_base__range_ii_u32__struct intersect(
      wuffs_base__range_ii_u32__struct s) const;
  inline wuffs_base__range_ii_u32__struct unite(
      wuffs_base__range_ii_u32__struct s) const;
  inline bool contains(uint32_t x) const;
  inline bool contains_range(wuffs_base__range_ii_u32__struct s) const;
#endif  // __cplusplus

} wuffs_base__range_ii_u32;

static inline wuffs_base__range_ii_u32  //
wuffs_base__make_range_ii_u32(uint32_t min_incl, uint32_t max_incl) {
  wuffs_base__range_ii_u32 ret;
  ret.min_incl = min_incl;
  ret.max_incl = max_incl;
  return ret;
}

static inline bool  //
wuffs_base__range_ii_u32__is_empty(const wuffs_base__range_ii_u32* r) {
  return r->min_incl > r->max_incl;
}

static inline bool  //
wuffs_base__range_ii_u32__equals(const wuffs_base__range_ii_u32* r,
                                 wuffs_base__range_ii_u32 s) {
  return (r->min_incl == s.min_incl && r->max_incl == s.max_incl) ||
         (wuffs_base__range_ii_u32__is_empty(r) &&
          wuffs_base__range_ii_u32__is_empty(&s));
}

static inline wuffs_base__range_ii_u32  //
wuffs_base__range_ii_u32__intersect(const wuffs_base__range_ii_u32* r,
                                    wuffs_base__range_ii_u32 s) {
  wuffs_base__range_ii_u32 t;
  t.min_incl = wuffs_base__u32__max(r->min_incl, s.min_incl);
  t.max_incl = wuffs_base__u32__min(r->max_incl, s.max_incl);
  return t;
}

static inline wuffs_base__range_ii_u32  //
wuffs_base__range_ii_u32__unite(const wuffs_base__range_ii_u32* r,
                                wuffs_base__range_ii_u32 s) {
  if (wuffs_base__range_ii_u32__is_empty(r)) {
    return s;
  }
  if (wuffs_base__range_ii_u32__is_empty(&s)) {
    return *r;
  }
  wuffs_base__range_ii_u32 t;
  t.min_incl = wuffs_base__u32__min(r->min_incl, s.min_incl);
  t.max_incl = wuffs_base__u32__max(r->max_incl, s.max_incl);
  return t;
}

static inline bool  //
wuffs_base__range_ii_u32__contains(const wuffs_base__range_ii_u32* r,
                                   uint32_t x) {
  return (r->min_incl <= x) && (x <= r->max_incl);
}

static inline bool  //
wuffs_base__range_ii_u32__contains_range(const wuffs_base__range_ii_u32* r,
                                         wuffs_base__range_ii_u32 s) {
  return wuffs_base__range_ii_u32__equals(
      &s, wuffs_base__range_ii_u32__intersect(r, s));
}

#ifdef __cplusplus

inline bool  //
wuffs_base__range_ii_u32::is_empty() const {
  return wuffs_base__range_ii_u32__is_empty(this);
}

inline bool  //
wuffs_base__range_ii_u32::equals(wuffs_base__range_ii_u32 s) const {
  return wuffs_base__range_ii_u32__equals(this, s);
}

inline wuffs_base__range_ii_u32  //
wuffs_base__range_ii_u32::intersect(wuffs_base__range_ii_u32 s) const {
  return wuffs_base__range_ii_u32__intersect(this, s);
}

inline wuffs_base__range_ii_u32  //
wuffs_base__range_ii_u32::unite(wuffs_base__range_ii_u32 s) const {
  return wuffs_base__range_ii_u32__unite(this, s);
}

inline bool  //
wuffs_base__range_ii_u32::contains(uint32_t x) const {
  return wuffs_base__range_ii_u32__contains(this, x);
}

inline bool  //
wuffs_base__range_ii_u32::contains_range(wuffs_base__range_ii_u32 s) const {
  return wuffs_base__range_ii_u32__contains_range(this, s);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__range_ie_u32__struct {
  uint32_t min_incl;
  uint32_t max_excl;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__range_ie_u32__struct s) const;
  inline wuffs_base__range_ie_u32__struct intersect(
      wuffs_base__range_ie_u32__struct s) const;
  inline wuffs_base__range_ie_u32__struct unite(
      wuffs_base__range_ie_u32__struct s) const;
  inline bool contains(uint32_t x) const;
  inline bool contains_range(wuffs_base__range_ie_u32__struct s) const;
  inline uint32_t length() const;
#endif  // __cplusplus

} wuffs_base__range_ie_u32;

static inline wuffs_base__range_ie_u32  //
wuffs_base__make_range_ie_u32(uint32_t min_incl, uint32_t max_excl) {
  wuffs_base__range_ie_u32 ret;
  ret.min_incl = min_incl;
  ret.max_excl = max_excl;
  return ret;
}

static inline bool  //
wuffs_base__range_ie_u32__is_empty(const wuffs_base__range_ie_u32* r) {
  return r->min_incl >= r->max_excl;
}

static inline bool  //
wuffs_base__range_ie_u32__equals(const wuffs_base__range_ie_u32* r,
                                 wuffs_base__range_ie_u32 s) {
  return (r->min_incl == s.min_incl && r->max_excl == s.max_excl) ||
         (wuffs_base__range_ie_u32__is_empty(r) &&
          wuffs_base__range_ie_u32__is_empty(&s));
}

static inline wuffs_base__range_ie_u32  //
wuffs_base__range_ie_u32__intersect(const wuffs_base__range_ie_u32* r,
                                    wuffs_base__range_ie_u32 s) {
  wuffs_base__range_ie_u32 t;
  t.min_incl = wuffs_base__u32__max(r->min_incl, s.min_incl);
  t.max_excl = wuffs_base__u32__min(r->max_excl, s.max_excl);
  return t;
}

static inline wuffs_base__range_ie_u32  //
wuffs_base__range_ie_u32__unite(const wuffs_base__range_ie_u32* r,
                                wuffs_base__range_ie_u32 s) {
  if (wuffs_base__range_ie_u32__is_empty(r)) {
    return s;
  }
  if (wuffs_base__range_ie_u32__is_empty(&s)) {
    return *r;
  }
  wuffs_base__range_ie_u32 t;
  t.min_incl = wuffs_base__u32__min(r->min_incl, s.min_incl);
  t.max_excl = wuffs_base__u32__max(r->max_excl, s.max_excl);
  return t;
}

static inline bool  //
wuffs_base__range_ie_u32__contains(const wuffs_base__range_ie_u32* r,
                                   uint32_t x) {
  return (r->min_incl <= x) && (x < r->max_excl);
}

static inline bool  //
wuffs_base__range_ie_u32__contains_range(const wuffs_base__range_ie_u32* r,
                                         wuffs_base__range_ie_u32 s) {
  return wuffs_base__range_ie_u32__equals(
      &s, wuffs_base__range_ie_u32__intersect(r, s));
}

static inline uint32_t  //
wuffs_base__range_ie_u32__length(const wuffs_base__range_ie_u32* r) {
  return wuffs_base__u32__sat_sub(r->max_excl, r->min_incl);
}

#ifdef __cplusplus

inline bool  //
wuffs_base__range_ie_u32::is_empty() const {
  return wuffs_base__range_ie_u32__is_empty(this);
}

inline bool  //
wuffs_base__range_ie_u32::equals(wuffs_base__range_ie_u32 s) const {
  return wuffs_base__range_ie_u32__equals(this, s);
}

inline wuffs_base__range_ie_u32  //
wuffs_base__range_ie_u32::intersect(wuffs_base__range_ie_u32 s) const {
  return wuffs_base__range_ie_u32__intersect(this, s);
}

inline wuffs_base__range_ie_u32  //
wuffs_base__range_ie_u32::unite(wuffs_base__range_ie_u32 s) const {
  return wuffs_base__range_ie_u32__unite(this, s);
}

inline bool  //
wuffs_base__range_ie_u32::contains(uint32_t x) const {
  return wuffs_base__range_ie_u32__contains(this, x);
}

inline bool  //
wuffs_base__range_ie_u32::contains_range(wuffs_base__range_ie_u32 s) const {
  return wuffs_base__range_ie_u32__contains_range(this, s);
}

inline uint32_t  //
wuffs_base__range_ie_u32::length() const {
  return wuffs_base__range_ie_u32__length(this);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__range_ii_u64__struct {
  uint64_t min_incl;
  uint64_t max_incl;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__range_ii_u64__struct s) const;
  inline wuffs_base__range_ii_u64__struct intersect(
      wuffs_base__range_ii_u64__struct s) const;
  inline wuffs_base__range_ii_u64__struct unite(
      wuffs_base__range_ii_u64__struct s) const;
  inline bool contains(uint64_t x) const;
  inline bool contains_range(wuffs_base__range_ii_u64__struct s) const;
#endif  // __cplusplus

} wuffs_base__range_ii_u64;

static inline wuffs_base__range_ii_u64  //
wuffs_base__make_range_ii_u64(uint64_t min_incl, uint64_t max_incl) {
  wuffs_base__range_ii_u64 ret;
  ret.min_incl = min_incl;
  ret.max_incl = max_incl;
  return ret;
}

static inline bool  //
wuffs_base__range_ii_u64__is_empty(const wuffs_base__range_ii_u64* r) {
  return r->min_incl > r->max_incl;
}

static inline bool  //
wuffs_base__range_ii_u64__equals(const wuffs_base__range_ii_u64* r,
                                 wuffs_base__range_ii_u64 s) {
  return (r->min_incl == s.min_incl && r->max_incl == s.max_incl) ||
         (wuffs_base__range_ii_u64__is_empty(r) &&
          wuffs_base__range_ii_u64__is_empty(&s));
}

static inline wuffs_base__range_ii_u64  //
wuffs_base__range_ii_u64__intersect(const wuffs_base__range_ii_u64* r,
                                    wuffs_base__range_ii_u64 s) {
  wuffs_base__range_ii_u64 t;
  t.min_incl = wuffs_base__u64__max(r->min_incl, s.min_incl);
  t.max_incl = wuffs_base__u64__min(r->max_incl, s.max_incl);
  return t;
}

static inline wuffs_base__range_ii_u64  //
wuffs_base__range_ii_u64__unite(const wuffs_base__range_ii_u64* r,
                                wuffs_base__range_ii_u64 s) {
  if (wuffs_base__range_ii_u64__is_empty(r)) {
    return s;
  }
  if (wuffs_base__range_ii_u64__is_empty(&s)) {
    return *r;
  }
  wuffs_base__range_ii_u64 t;
  t.min_incl = wuffs_base__u64__min(r->min_incl, s.min_incl);
  t.max_incl = wuffs_base__u64__max(r->max_incl, s.max_incl);
  return t;
}

static inline bool  //
wuffs_base__range_ii_u64__contains(const wuffs_base__range_ii_u64* r,
                                   uint64_t x) {
  return (r->min_incl <= x) && (x <= r->max_incl);
}

static inline bool  //
wuffs_base__range_ii_u64__contains_range(const wuffs_base__range_ii_u64* r,
                                         wuffs_base__range_ii_u64 s) {
  return wuffs_base__range_ii_u64__equals(
      &s, wuffs_base__range_ii_u64__intersect(r, s));
}

#ifdef __cplusplus

inline bool  //
wuffs_base__range_ii_u64::is_empty() const {
  return wuffs_base__range_ii_u64__is_empty(this);
}

inline bool  //
wuffs_base__range_ii_u64::equals(wuffs_base__range_ii_u64 s) const {
  return wuffs_base__range_ii_u64__equals(this, s);
}

inline wuffs_base__range_ii_u64  //
wuffs_base__range_ii_u64::intersect(wuffs_base__range_ii_u64 s) const {
  return wuffs_base__range_ii_u64__intersect(this, s);
}

inline wuffs_base__range_ii_u64  //
wuffs_base__range_ii_u64::unite(wuffs_base__range_ii_u64 s) const {
  return wuffs_base__range_ii_u64__unite(this, s);
}

inline bool  //
wuffs_base__range_ii_u64::contains(uint64_t x) const {
  return wuffs_base__range_ii_u64__contains(this, x);
}

inline bool  //
wuffs_base__range_ii_u64::contains_range(wuffs_base__range_ii_u64 s) const {
  return wuffs_base__range_ii_u64__contains_range(this, s);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__range_ie_u64__struct {
  uint64_t min_incl;
  uint64_t max_excl;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__range_ie_u64__struct s) const;
  inline wuffs_base__range_ie_u64__struct intersect(
      wuffs_base__range_ie_u64__struct s) const;
  inline wuffs_base__range_ie_u64__struct unite(
      wuffs_base__range_ie_u64__struct s) const;
  inline bool contains(uint64_t x) const;
  inline bool contains_range(wuffs_base__range_ie_u64__struct s) const;
  inline uint64_t length() const;
#endif  // __cplusplus

} wuffs_base__range_ie_u64;

static inline wuffs_base__range_ie_u64  //
wuffs_base__make_range_ie_u64(uint64_t min_incl, uint64_t max_excl) {
  wuffs_base__range_ie_u64 ret;
  ret.min_incl = min_incl;
  ret.max_excl = max_excl;
  return ret;
}

static inline bool  //
wuffs_base__range_ie_u64__is_empty(const wuffs_base__range_ie_u64* r) {
  return r->min_incl >= r->max_excl;
}

static inline bool  //
wuffs_base__range_ie_u64__equals(const wuffs_base__range_ie_u64* r,
                                 wuffs_base__range_ie_u64 s) {
  return (r->min_incl == s.min_incl && r->max_excl == s.max_excl) ||
         (wuffs_base__range_ie_u64__is_empty(r) &&
          wuffs_base__range_ie_u64__is_empty(&s));
}

static inline wuffs_base__range_ie_u64  //
wuffs_base__range_ie_u64__intersect(const wuffs_base__range_ie_u64* r,
                                    wuffs_base__range_ie_u64 s) {
  wuffs_base__range_ie_u64 t;
  t.min_incl = wuffs_base__u64__max(r->min_incl, s.min_incl);
  t.max_excl = wuffs_base__u64__min(r->max_excl, s.max_excl);
  return t;
}

static inline wuffs_base__range_ie_u64  //
wuffs_base__range_ie_u64__unite(const wuffs_base__range_ie_u64* r,
                                wuffs_base__range_ie_u64 s) {
  if (wuffs_base__range_ie_u64__is_empty(r)) {
    return s;
  }
  if (wuffs_base__range_ie_u64__is_empty(&s)) {
    return *r;
  }
  wuffs_base__range_ie_u64 t;
  t.min_incl = wuffs_base__u64__min(r->min_incl, s.min_incl);
  t.max_excl = wuffs_base__u64__max(r->max_excl, s.max_excl);
  return t;
}

static inline bool  //
wuffs_base__range_ie_u64__contains(const wuffs_base__range_ie_u64* r,
                                   uint64_t x) {
  return (r->min_incl <= x) && (x < r->max_excl);
}

static inline bool  //
wuffs_base__range_ie_u64__contains_range(const wuffs_base__range_ie_u64* r,
                                         wuffs_base__range_ie_u64 s) {
  return wuffs_base__range_ie_u64__equals(
      &s, wuffs_base__range_ie_u64__intersect(r, s));
}

static inline uint64_t  //
wuffs_base__range_ie_u64__length(const wuffs_base__range_ie_u64* r) {
  return wuffs_base__u64__sat_sub(r->max_excl, r->min_incl);
}

#ifdef __cplusplus

inline bool  //
wuffs_base__range_ie_u64::is_empty() const {
  return wuffs_base__range_ie_u64__is_empty(this);
}

inline bool  //
wuffs_base__range_ie_u64::equals(wuffs_base__range_ie_u64 s) const {
  return wuffs_base__range_ie_u64__equals(this, s);
}

inline wuffs_base__range_ie_u64  //
wuffs_base__range_ie_u64::intersect(wuffs_base__range_ie_u64 s) const {
  return wuffs_base__range_ie_u64__intersect(this, s);
}

inline wuffs_base__range_ie_u64  //
wuffs_base__range_ie_u64::unite(wuffs_base__range_ie_u64 s) const {
  return wuffs_base__range_ie_u64__unite(this, s);
}

inline bool  //
wuffs_base__range_ie_u64::contains(uint64_t x) const {
  return wuffs_base__range_ie_u64__contains(this, x);
}

inline bool  //
wuffs_base__range_ie_u64::contains_range(wuffs_base__range_ie_u64 s) const {
  return wuffs_base__range_ie_u64__contains_range(this, s);
}

inline uint64_t  //
wuffs_base__range_ie_u64::length() const {
  return wuffs_base__range_ie_u64__length(this);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__rect_ii_u32__struct {
  uint32_t min_incl_x;
  uint32_t min_incl_y;
  uint32_t max_incl_x;
  uint32_t max_incl_y;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__rect_ii_u32__struct s) const;
  inline wuffs_base__rect_ii_u32__struct intersect(
      wuffs_base__rect_ii_u32__struct s) const;
  inline wuffs_base__rect_ii_u32__struct unite(
      wuffs_base__rect_ii_u32__struct s) const;
  inline bool contains(uint32_t x, uint32_t y) const;
  inline bool contains_rect(wuffs_base__rect_ii_u32__struct s) const;
#endif  // __cplusplus

} wuffs_base__rect_ii_u32;

static inline wuffs_base__rect_ii_u32  //
wuffs_base__make_rect_ii_u32(uint32_t min_incl_x,
                             uint32_t min_incl_y,
                             uint32_t max_incl_x,
                             uint32_t max_incl_y) {
  wuffs_base__rect_ii_u32 ret;
  ret.min_incl_x = min_incl_x;
  ret.min_incl_y = min_incl_y;
  ret.max_incl_x = max_incl_x;
  ret.max_incl_y = max_incl_y;
  return ret;
}

static inline bool  //
wuffs_base__rect_ii_u32__is_empty(const wuffs_base__rect_ii_u32* r) {
  return (r->min_incl_x > r->max_incl_x) || (r->min_incl_y > r->max_incl_y);
}

static inline bool  //
wuffs_base__rect_ii_u32__equals(const wuffs_base__rect_ii_u32* r,
                                wuffs_base__rect_ii_u32 s) {
  return (r->min_incl_x == s.min_incl_x && r->min_incl_y == s.min_incl_y &&
          r->max_incl_x == s.max_incl_x && r->max_incl_y == s.max_incl_y) ||
         (wuffs_base__rect_ii_u32__is_empty(r) &&
          wuffs_base__rect_ii_u32__is_empty(&s));
}

static inline wuffs_base__rect_ii_u32  //
wuffs_base__rect_ii_u32__intersect(const wuffs_base__rect_ii_u32* r,
                                   wuffs_base__rect_ii_u32 s) {
  wuffs_base__rect_ii_u32 t;
  t.min_incl_x = wuffs_base__u32__max(r->min_incl_x, s.min_incl_x);
  t.min_incl_y = wuffs_base__u32__max(r->min_incl_y, s.min_incl_y);
  t.max_incl_x = wuffs_base__u32__min(r->max_incl_x, s.max_incl_x);
  t.max_incl_y = wuffs_base__u32__min(r->max_incl_y, s.max_incl_y);
  return t;
}

static inline wuffs_base__rect_ii_u32  //
wuffs_base__rect_ii_u32__unite(const wuffs_base__rect_ii_u32* r,
                               wuffs_base__rect_ii_u32 s) {
  if (wuffs_base__rect_ii_u32__is_empty(r)) {
    return s;
  }
  if (wuffs_base__rect_ii_u32__is_empty(&s)) {
    return *r;
  }
  wuffs_base__rect_ii_u32 t;
  t.min_incl_x = wuffs_base__u32__min(r->min_incl_x, s.min_incl_x);
  t.min_incl_y = wuffs_base__u32__min(r->min_incl_y, s.min_incl_y);
  t.max_incl_x = wuffs_base__u32__max(r->max_incl_x, s.max_incl_x);
  t.max_incl_y = wuffs_base__u32__max(r->max_incl_y, s.max_incl_y);
  return t;
}

static inline bool  //
wuffs_base__rect_ii_u32__contains(const wuffs_base__rect_ii_u32* r,
                                  uint32_t x,
                                  uint32_t y) {
  return (r->min_incl_x <= x) && (x <= r->max_incl_x) && (r->min_incl_y <= y) &&
         (y <= r->max_incl_y);
}

static inline bool  //
wuffs_base__rect_ii_u32__contains_rect(const wuffs_base__rect_ii_u32* r,
                                       wuffs_base__rect_ii_u32 s) {
  return wuffs_base__rect_ii_u32__equals(
      &s, wuffs_base__rect_ii_u32__intersect(r, s));
}

#ifdef __cplusplus

inline bool  //
wuffs_base__rect_ii_u32::is_empty() const {
  return wuffs_base__rect_ii_u32__is_empty(this);
}

inline bool  //
wuffs_base__rect_ii_u32::equals(wuffs_base__rect_ii_u32 s) const {
  return wuffs_base__rect_ii_u32__equals(this, s);
}

inline wuffs_base__rect_ii_u32  //
wuffs_base__rect_ii_u32::intersect(wuffs_base__rect_ii_u32 s) const {
  return wuffs_base__rect_ii_u32__intersect(this, s);
}

inline wuffs_base__rect_ii_u32  //
wuffs_base__rect_ii_u32::unite(wuffs_base__rect_ii_u32 s) const {
  return wuffs_base__rect_ii_u32__unite(this, s);
}

inline bool  //
wuffs_base__rect_ii_u32::contains(uint32_t x, uint32_t y) const {
  return wuffs_base__rect_ii_u32__contains(this, x, y);
}

inline bool  //
wuffs_base__rect_ii_u32::contains_rect(wuffs_base__rect_ii_u32 s) const {
  return wuffs_base__rect_ii_u32__contains_rect(this, s);
}

#endif  // __cplusplus

// --------

typedef struct wuffs_base__rect_ie_u32__struct {
  uint32_t min_incl_x;
  uint32_t min_incl_y;
  uint32_t max_excl_x;
  uint32_t max_excl_y;

#ifdef __cplusplus
  inline bool is_empty() const;
  inline bool equals(wuffs_base__rect_ie_u32__struct s) const;
  inline wuffs_base__rect_ie_u32__struct intersect(
      wuffs_base__rect_ie_u32__struct s) const;
  inline wuffs_base__rect_ie_u32__struct unite(
      wuffs_base__rect_ie_u32__struct s) const;
  inline bool contains(uint32_t x, uint32_t y) const;
  inline bool contains_rect(wuffs_base__rect_ie_u32__struct s) const;
  inline uint32_t width() const;
  inline uint32_t height() const;
#endif  // __cplusplus

} wuffs_base__rect_ie_u32;

static inline wuffs_base__rect_ie_u32  //
wuffs_base__make_rect_ie_u32(uint32_t min_incl_x,
                             uint32_t min_incl_y,
                             uint32_t max_excl_x,
                             uint32_t max_excl_y) {
  wuffs_base__rect_ie_u32 ret;
  ret.min_incl_x = min_incl_x;
  ret.min_incl_y = min_incl_y;
  ret.max_excl_x = max_excl_x;
  ret.max_excl_y = max_excl_y;
  return ret;
}

static inline bool  //
wuffs_base__rect_ie_u32__is_empty(const wuffs_base__rect_ie_u32* r) {
  return (r->min_incl_x >= r->max_excl_x) || (r->min_incl_y >= r->max_excl_y);
}

static inline bool  //
wuffs_base__rect_ie_u32__equals(const wuffs_base__rect_ie_u32* r,
                                wuffs_base__rect_ie_u32 s) {
  return (r->min_incl_x == s.min_incl_x && r->min_incl_y == s.min_incl_y &&
          r->max_excl_x == s.max_excl_x && r->max_excl_y == s.max_excl_y) ||
         (wuffs_base__rect_ie_u32__is_empty(r) &&
          wuffs_base__rect_ie_u32__is_empty(&s));
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__rect_ie_u32__intersect(const wuffs_base__rect_ie_u32* r,
                                   wuffs_base__rect_ie_u32 s) {
  wuffs_base__rect_ie_u32 t;
  t.min_incl_x = wuffs_base__u32__max(r->min_incl_x, s.min_incl_x);
  t.min_incl_y = wuffs_base__u32__max(r->min_incl_y, s.min_incl_y);
  t.max_excl_x = wuffs_base__u32__min(r->max_excl_x, s.max_excl_x);
  t.max_excl_y = wuffs_base__u32__min(r->max_excl_y, s.max_excl_y);
  return t;
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__rect_ie_u32__unite(const wuffs_base__rect_ie_u32* r,
                               wuffs_base__rect_ie_u32 s) {
  if (wuffs_base__rect_ie_u32__is_empty(r)) {
    return s;
  }
  if (wuffs_base__rect_ie_u32__is_empty(&s)) {
    return *r;
  }
  wuffs_base__rect_ie_u32 t;
  t.min_incl_x = wuffs_base__u32__min(r->min_incl_x, s.min_incl_x);
  t.min_incl_y = wuffs_base__u32__min(r->min_incl_y, s.min_incl_y);
  t.max_excl_x = wuffs_base__u32__max(r->max_excl_x, s.max_excl_x);
  t.max_excl_y = wuffs_base__u32__max(r->max_excl_y, s.max_excl_y);
  return t;
}

static inline bool  //
wuffs_base__rect_ie_u32__contains(const wuffs_base__rect_ie_u32* r,
                                  uint32_t x,
                                  uint32_t y) {
  return (r->min_incl_x <= x) && (x < r->max_excl_x) && (r->min_incl_y <= y) &&
         (y < r->max_excl_y);
}

static inline bool  //
wuffs_base__rect_ie_u32__contains_rect(const wuffs_base__rect_ie_u32* r,
                                       wuffs_base__rect_ie_u32 s) {
  return wuffs_base__rect_ie_u32__equals(
      &s, wuffs_base__rect_ie_u32__intersect(r, s));
}

static inline uint32_t  //
wuffs_base__rect_ie_u32__width(const wuffs_base__rect_ie_u32* r) {
  return wuffs_base__u32__sat_sub(r->max_excl_x, r->min_incl_x);
}

static inline uint32_t  //
wuffs_base__rect_ie_u32__height(const wuffs_base__rect_ie_u32* r) {
  return wuffs_base__u32__sat_sub(r->max_excl_y, r->min_incl_y);
}

#ifdef __cplusplus

inline bool  //
wuffs_base__rect_ie_u32::is_empty() const {
  return wuffs_base__rect_ie_u32__is_empty(this);
}

inline bool  //
wuffs_base__rect_ie_u32::equals(wuffs_base__rect_ie_u32 s) const {
  return wuffs_base__rect_ie_u32__equals(this, s);
}

inline wuffs_base__rect_ie_u32  //
wuffs_base__rect_ie_u32::intersect(wuffs_base__rect_ie_u32 s) const {
  return wuffs_base__rect_ie_u32__intersect(this, s);
}

inline wuffs_base__rect_ie_u32  //
wuffs_base__rect_ie_u32::unite(wuffs_base__rect_ie_u32 s) const {
  return wuffs_base__rect_ie_u32__unite(this, s);
}

inline bool  //
wuffs_base__rect_ie_u32::contains(uint32_t x, uint32_t y) const {
  return wuffs_base__rect_ie_u32__contains(this, x, y);
}

inline bool  //
wuffs_base__rect_ie_u32::contains_rect(wuffs_base__rect_ie_u32 s) const {
  return wuffs_base__rect_ie_u32__contains_rect(this, s);
}

inline uint32_t  //
wuffs_base__rect_ie_u32::width() const {
  return wuffs_base__rect_ie_u32__width(this);
}

inline uint32_t  //
wuffs_base__rect_ie_u32::height() const {
  return wuffs_base__rect_ie_u32__height(this);
}

#endif  // __cplusplus

// ---------------- I/O
//
// See (/doc/note/io-input-output.md).

// wuffs_base__io_buffer_meta is the metadata for a wuffs_base__io_buffer's
// data.
typedef struct {
  size_t wi;     // Write index. Invariant: wi <= len.
  size_t ri;     // Read  index. Invariant: ri <= wi.
  uint64_t pos;  // Position of the buffer start relative to the stream start.
  bool closed;   // No further writes are expected.
} wuffs_base__io_buffer_meta;

// wuffs_base__io_buffer is a 1-dimensional buffer (a pointer and length) plus
// additional metadata.
//
// A value with all fields zero is a valid, empty buffer.
typedef struct {
  wuffs_base__slice_u8 data;
  wuffs_base__io_buffer_meta meta;

#ifdef __cplusplus
  inline void compact();
  inline uint64_t reader_available() const;
  inline uint64_t reader_io_position() const;
  inline uint64_t writer_available() const;
  inline uint64_t writer_io_position() const;
#endif  // __cplusplus

} wuffs_base__io_buffer;

static inline wuffs_base__io_buffer  //
wuffs_base__make_io_buffer(wuffs_base__slice_u8 data,
                           wuffs_base__io_buffer_meta meta) {
  wuffs_base__io_buffer ret;
  ret.data = data;
  ret.meta = meta;
  return ret;
}

static inline wuffs_base__io_buffer_meta  //
wuffs_base__make_io_buffer_meta(size_t wi,
                                size_t ri,
                                uint64_t pos,
                                bool closed) {
  wuffs_base__io_buffer_meta ret;
  ret.wi = wi;
  ret.ri = ri;
  ret.pos = pos;
  ret.closed = closed;
  return ret;
}

static inline wuffs_base__io_buffer  //
wuffs_base__empty_io_buffer() {
  wuffs_base__io_buffer ret;
  ret.data.ptr = NULL;
  ret.data.len = 0;
  ret.meta.wi = 0;
  ret.meta.ri = 0;
  ret.meta.pos = 0;
  ret.meta.closed = false;
  return ret;
}

static inline wuffs_base__io_buffer_meta  //
wuffs_base__empty_io_buffer_meta() {
  wuffs_base__io_buffer_meta ret;
  ret.wi = 0;
  ret.ri = 0;
  ret.pos = 0;
  ret.closed = false;
  return ret;
}

// wuffs_base__io_buffer__compact moves any written but unread bytes to the
// start of the buffer.
static inline void  //
wuffs_base__io_buffer__compact(wuffs_base__io_buffer* buf) {
  if (!buf || (buf->meta.ri == 0)) {
    return;
  }
  buf->meta.pos = wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri);
  size_t n = buf->meta.wi - buf->meta.ri;
  if (n != 0) {
    memmove(buf->data.ptr, buf->data.ptr + buf->meta.ri, n);
  }
  buf->meta.wi = n;
  buf->meta.ri = 0;
}

static inline uint64_t  //
wuffs_base__io_buffer__reader_available(const wuffs_base__io_buffer* buf) {
  return buf ? buf->meta.wi - buf->meta.ri : 0;
}

static inline uint64_t  //
wuffs_base__io_buffer__reader_io_position(const wuffs_base__io_buffer* buf) {
  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri) : 0;
}

static inline uint64_t  //
wuffs_base__io_buffer__writer_available(const wuffs_base__io_buffer* buf) {
  return buf ? buf->data.len - buf->meta.wi : 0;
}

static inline uint64_t  //
wuffs_base__io_buffer__writer_io_position(const wuffs_base__io_buffer* buf) {
  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.wi) : 0;
}

#ifdef __cplusplus

inline void  //
wuffs_base__io_buffer::compact() {
  wuffs_base__io_buffer__compact(this);
}

inline uint64_t  //
wuffs_base__io_buffer::reader_available() const {
  return wuffs_base__io_buffer__reader_available(this);
}

inline uint64_t  //
wuffs_base__io_buffer::reader_io_position() const {
  return wuffs_base__io_buffer__reader_io_position(this);
}

inline uint64_t  //
wuffs_base__io_buffer::writer_available() const {
  return wuffs_base__io_buffer__writer_available(this);
}

inline uint64_t  //
wuffs_base__io_buffer::writer_io_position() const {
  return wuffs_base__io_buffer__writer_io_position(this);
}

#endif  // __cplusplus

// ---------------- Memory Allocation

// The memory allocation related functions in this section aren't used by Wuffs
// per se, but they may be helpful to the code that uses Wuffs.

// wuffs_base__malloc_slice_uxx wraps calling a malloc-like function, except
// that it takes a uint64_t number of elements instead of a size_t size in
// bytes, and it returns a slice (a pointer and a length) instead of just a
// pointer.
//
// You can pass the C stdlib's malloc as the malloc_func.
//
// It returns an empty slice (containing a NULL ptr field) if (num_uxx *
// sizeof(uintxx_t)) would overflow SIZE_MAX.

static inline wuffs_base__slice_u8  //
wuffs_base__malloc_slice_u8(void* (*malloc_func)(size_t), uint64_t num_u8) {
  if (malloc_func && (num_u8 <= (SIZE_MAX / sizeof(uint8_t)))) {
    void* p = (*malloc_func)(num_u8 * sizeof(uint8_t));
    if (p) {
      return wuffs_base__make_slice_u8((uint8_t*)(p), num_u8);
    }
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

static inline wuffs_base__slice_u16  //
wuffs_base__malloc_slice_u16(void* (*malloc_func)(size_t), uint64_t num_u16) {
  if (malloc_func && (num_u16 <= (SIZE_MAX / sizeof(uint16_t)))) {
    void* p = (*malloc_func)(num_u16 * sizeof(uint16_t));
    if (p) {
      return wuffs_base__make_slice_u16((uint16_t*)(p), num_u16);
    }
  }
  return wuffs_base__make_slice_u16(NULL, 0);
}

static inline wuffs_base__slice_u32  //
wuffs_base__malloc_slice_u32(void* (*malloc_func)(size_t), uint64_t num_u32) {
  if (malloc_func && (num_u32 <= (SIZE_MAX / sizeof(uint32_t)))) {
    void* p = (*malloc_func)(num_u32 * sizeof(uint32_t));
    if (p) {
      return wuffs_base__make_slice_u32((uint32_t*)(p), num_u32);
    }
  }
  return wuffs_base__make_slice_u32(NULL, 0);
}

static inline wuffs_base__slice_u64  //
wuffs_base__malloc_slice_u64(void* (*malloc_func)(size_t), uint64_t num_u64) {
  if (malloc_func && (num_u64 <= (SIZE_MAX / sizeof(uint64_t)))) {
    void* p = (*malloc_func)(num_u64 * sizeof(uint64_t));
    if (p) {
      return wuffs_base__make_slice_u64((uint64_t*)(p), num_u64);
    }
  }
  return wuffs_base__make_slice_u64(NULL, 0);
}

// ---------------- Images

// wuffs_base__color_u32_argb_premul is an 8 bit per channel premultiplied
// Alpha, Red, Green, Blue color, as a uint32_t value. It is in word order, not
// byte order: its value is always 0xAARRGGBB, regardless of endianness.
typedef uint32_t wuffs_base__color_u32_argb_premul;

// --------

// wuffs_base__pixel_format encodes the format of the bytes that constitute an
// image frame's pixel data.
//
// See https://github.com/google/wuffs/blob/master/doc/note/pixel-formats.md
//
// Do not manipulate its bits directly; they are private implementation
// details. Use methods such as wuffs_base__pixel_format__num_planes instead.
typedef uint32_t wuffs_base__pixel_format;

// Common 8-bit-depth pixel formats. This list is not exhaustive; not all valid
// wuffs_base__pixel_format values are present.

#define WUFFS_BASE__PIXEL_FORMAT__INVALID ((wuffs_base__pixel_format)0x00000000)

#define WUFFS_BASE__PIXEL_FORMAT__A ((wuffs_base__pixel_format)0x02000008)

#define WUFFS_BASE__PIXEL_FORMAT__Y ((wuffs_base__pixel_format)0x10000008)
#define WUFFS_BASE__PIXEL_FORMAT__YA_NONPREMUL \
  ((wuffs_base__pixel_format)0x15000008)
#define WUFFS_BASE__PIXEL_FORMAT__YA_PREMUL \
  ((wuffs_base__pixel_format)0x16000008)

#define WUFFS_BASE__PIXEL_FORMAT__YCBCR ((wuffs_base__pixel_format)0x20020888)
#define WUFFS_BASE__PIXEL_FORMAT__YCBCRK ((wuffs_base__pixel_format)0x21038888)
#define WUFFS_BASE__PIXEL_FORMAT__YCBCRA_NONPREMUL \
  ((wuffs_base__pixel_format)0x25038888)

#define WUFFS_BASE__PIXEL_FORMAT__YCOCG ((wuffs_base__pixel_format)0x30020888)
#define WUFFS_BASE__PIXEL_FORMAT__YCOCGK ((wuffs_base__pixel_format)0x31038888)
#define WUFFS_BASE__PIXEL_FORMAT__YCOCGA_NONPREMUL \
  ((wuffs_base__pixel_format)0x35038888)

#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL \
  ((wuffs_base__pixel_format)0x45040008)
#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL \
  ((wuffs_base__pixel_format)0x46040008)
#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY \
  ((wuffs_base__pixel_format)0x47040008)

#define WUFFS_BASE__PIXEL_FORMAT__BGR ((wuffs_base__pixel_format)0x40000888)
#define WUFFS_BASE__PIXEL_FORMAT__BGRX ((wuffs_base__pixel_format)0x41008888)
#define WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL \
  ((wuffs_base__pixel_format)0x45008888)
#define WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL \
  ((wuffs_base__pixel_format)0x46008888)
#define WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY \
  ((wuffs_base__pixel_format)0x47008888)

#define WUFFS_BASE__PIXEL_FORMAT__RGB ((wuffs_base__pixel_format)0x50000888)
#define WUFFS_BASE__PIXEL_FORMAT__RGBX ((wuffs_base__pixel_format)0x51008888)
#define WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL \
  ((wuffs_base__pixel_format)0x55008888)
#define WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL \
  ((wuffs_base__pixel_format)0x56008888)
#define WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY \
  ((wuffs_base__pixel_format)0x57008888)

#define WUFFS_BASE__PIXEL_FORMAT__CMY ((wuffs_base__pixel_format)0x60020888)
#define WUFFS_BASE__PIXEL_FORMAT__CMYK ((wuffs_base__pixel_format)0x61038888)

extern const uint32_t wuffs_base__pixel_format__bits_per_channel[16];

static inline bool  //
wuffs_base__pixel_format__is_valid(wuffs_base__pixel_format f) {
  return f != 0;
}

// wuffs_base__pixel_format__bits_per_pixel returns the number of bits per
// pixel for interleaved pixel formats, and returns 0 for planar pixel formats.
static inline uint32_t  //
wuffs_base__pixel_format__bits_per_pixel(wuffs_base__pixel_format f) {
  if (((f >> 16) & 0x03) != 0) {
    return 0;
  }
  return wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 0)] +
         wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 4)] +
         wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 8)] +
         wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 12)];
}

static inline bool  //
wuffs_base__pixel_format__is_indexed(wuffs_base__pixel_format f) {
  return (f >> 18) & 0x01;
}

static inline bool  //
wuffs_base__pixel_format__is_interleaved(wuffs_base__pixel_format f) {
  return ((f >> 16) & 0x03) == 0;
}

static inline bool  //
wuffs_base__pixel_format__is_planar(wuffs_base__pixel_format f) {
  return ((f >> 16) & 0x03) != 0;
}

static inline uint32_t  //
wuffs_base__pixel_format__num_planes(wuffs_base__pixel_format f) {
  return ((f >> 16) & 0x03) + 1;
}

#define WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX 4

#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__INDEX_PLANE 0
#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE 3

// --------

// wuffs_base__pixel_subsampling encodes whether sample values cover one pixel
// or cover multiple pixels.
//
// See https://github.com/google/wuffs/blob/master/doc/note/pixel-subsampling.md
//
// Do not manipulate its bits directly; they are private implementation
// details. Use methods such as wuffs_base__pixel_subsampling__bias_x instead.
typedef uint32_t wuffs_base__pixel_subsampling;

#define WUFFS_BASE__PIXEL_SUBSAMPLING__NONE ((wuffs_base__pixel_subsampling)0)

#define WUFFS_BASE__PIXEL_SUBSAMPLING__444 \
  ((wuffs_base__pixel_subsampling)0x000000)
#define WUFFS_BASE__PIXEL_SUBSAMPLING__440 \
  ((wuffs_base__pixel_subsampling)0x010100)
#define WUFFS_BASE__PIXEL_SUBSAMPLING__422 \
  ((wuffs_base__pixel_subsampling)0x101000)
#define WUFFS_BASE__PIXEL_SUBSAMPLING__420 \
  ((wuffs_base__pixel_subsampling)0x111100)
#define WUFFS_BASE__PIXEL_SUBSAMPLING__411 \
  ((wuffs_base__pixel_subsampling)0x303000)
#define WUFFS_BASE__PIXEL_SUBSAMPLING__410 \
  ((wuffs_base__pixel_subsampling)0x313100)

static inline uint32_t  //
wuffs_base__pixel_subsampling__bias_x(wuffs_base__pixel_subsampling s,
                                      uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 6;
  return (s >> shift) & 0x03;
}

static inline uint32_t  //
wuffs_base__pixel_subsampling__denominator_x(wuffs_base__pixel_subsampling s,
                                             uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 4;
  return ((s >> shift) & 0x03) + 1;
}

static inline uint32_t  //
wuffs_base__pixel_subsampling__bias_y(wuffs_base__pixel_subsampling s,
                                      uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 2;
  return (s >> shift) & 0x03;
}

static inline uint32_t  //
wuffs_base__pixel_subsampling__denominator_y(wuffs_base__pixel_subsampling s,
                                             uint32_t plane) {
  uint32_t shift = ((plane & 0x03) * 8) + 0;
  return ((s >> shift) & 0x03) + 1;
}

// --------

typedef struct {
  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    wuffs_base__pixel_format pixfmt;
    wuffs_base__pixel_subsampling pixsub;
    uint32_t width;
    uint32_t height;
  } private_impl;

#ifdef __cplusplus
  inline void set(wuffs_base__pixel_format pixfmt,
                  wuffs_base__pixel_subsampling pixsub,
                  uint32_t width,
                  uint32_t height);
  inline void invalidate();
  inline bool is_valid() const;
  inline wuffs_base__pixel_format pixel_format() const;
  inline wuffs_base__pixel_subsampling pixel_subsampling() const;
  inline wuffs_base__rect_ie_u32 bounds() const;
  inline uint32_t width() const;
  inline uint32_t height() const;
  inline uint64_t pixbuf_len() const;
#endif  // __cplusplus

} wuffs_base__pixel_config;

static inline wuffs_base__pixel_config  //
wuffs_base__null_pixel_config() {
  wuffs_base__pixel_config ret;
  ret.private_impl.pixfmt = 0;
  ret.private_impl.pixsub = 0;
  ret.private_impl.width = 0;
  ret.private_impl.height = 0;
  return ret;
}

// TODO: Should this function return bool? An error type?
static inline void  //
wuffs_base__pixel_config__set(wuffs_base__pixel_config* c,
                              wuffs_base__pixel_format pixfmt,
                              wuffs_base__pixel_subsampling pixsub,
                              uint32_t width,
                              uint32_t height) {
  if (!c) {
    return;
  }
  if (pixfmt) {
    uint64_t wh = ((uint64_t)width) * ((uint64_t)height);
    // TODO: handle things other than 1 byte per pixel.
    if (wh <= ((uint64_t)SIZE_MAX)) {
      c->private_impl.pixfmt = pixfmt;
      c->private_impl.pixsub = pixsub;
      c->private_impl.width = width;
      c->private_impl.height = height;
      return;
    }
  }

  c->private_impl.pixfmt = 0;
  c->private_impl.pixsub = 0;
  c->private_impl.width = 0;
  c->private_impl.height = 0;
}

static inline void  //
wuffs_base__pixel_config__invalidate(wuffs_base__pixel_config* c) {
  if (c) {
    c->private_impl.pixfmt = 0;
    c->private_impl.pixsub = 0;
    c->private_impl.width = 0;
    c->private_impl.height = 0;
  }
}

static inline bool  //
wuffs_base__pixel_config__is_valid(const wuffs_base__pixel_config* c) {
  return c && c->private_impl.pixfmt;
}

static inline wuffs_base__pixel_format  //
wuffs_base__pixel_config__pixel_format(const wuffs_base__pixel_config* c) {
  return c ? c->private_impl.pixfmt : 0;
}

static inline wuffs_base__pixel_subsampling  //
wuffs_base__pixel_config__pixel_subsampling(const wuffs_base__pixel_config* c) {
  return c ? c->private_impl.pixsub : 0;
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__pixel_config__bounds(const wuffs_base__pixel_config* c) {
  if (c) {
    wuffs_base__rect_ie_u32 ret;
    ret.min_incl_x = 0;
    ret.min_incl_y = 0;
    ret.max_excl_x = c->private_impl.width;
    ret.max_excl_y = c->private_impl.height;
    return ret;
  }

  wuffs_base__rect_ie_u32 ret;
  ret.min_incl_x = 0;
  ret.min_incl_y = 0;
  ret.max_excl_x = 0;
  ret.max_excl_y = 0;
  return ret;
}

static inline uint32_t  //
wuffs_base__pixel_config__width(const wuffs_base__pixel_config* c) {
  return c ? c->private_impl.width : 0;
}

static inline uint32_t  //
wuffs_base__pixel_config__height(const wuffs_base__pixel_config* c) {
  return c ? c->private_impl.height : 0;
}

// TODO: this is the right API for planar (not interleaved) pixbufs? Should it
// allow decoding into a color model different from the format's intrinsic one?
// For example, decoding a JPEG image straight to RGBA instead of to YCbCr?
static inline uint64_t  //
wuffs_base__pixel_config__pixbuf_len(const wuffs_base__pixel_config* c) {
  if (!c) {
    return 0;
  }
  if (wuffs_base__pixel_format__is_planar(c->private_impl.pixfmt)) {
    // TODO: support planar pixel formats, concious of pixel subsampling.
    return 0;
  }
  uint32_t bits_per_pixel =
      wuffs_base__pixel_format__bits_per_pixel(c->private_impl.pixfmt);
  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
    return 0;
  }
  uint64_t bytes_per_pixel = bits_per_pixel / 8;

  uint64_t n =
      ((uint64_t)c->private_impl.width) * ((uint64_t)c->private_impl.height);
  if (n > (UINT64_MAX / bytes_per_pixel)) {
    return 0;
  }
  n *= bytes_per_pixel;

  if (wuffs_base__pixel_format__is_indexed(c->private_impl.pixfmt)) {
    if (n > (UINT64_MAX - 1024)) {
      return 0;
    }
    n += 1024;
  }

  return n;
}

#ifdef __cplusplus

inline void  //
wuffs_base__pixel_config::set(wuffs_base__pixel_format pixfmt,
                              wuffs_base__pixel_subsampling pixsub,
                              uint32_t width,
                              uint32_t height) {
  wuffs_base__pixel_config__set(this, pixfmt, pixsub, width, height);
}

inline void  //
wuffs_base__pixel_config::invalidate() {
  wuffs_base__pixel_config__invalidate(this);
}

inline bool  //
wuffs_base__pixel_config::is_valid() const {
  return wuffs_base__pixel_config__is_valid(this);
}

inline wuffs_base__pixel_format  //
wuffs_base__pixel_config::pixel_format() const {
  return wuffs_base__pixel_config__pixel_format(this);
}

inline wuffs_base__pixel_subsampling  //
wuffs_base__pixel_config::pixel_subsampling() const {
  return wuffs_base__pixel_config__pixel_subsampling(this);
}

inline wuffs_base__rect_ie_u32  //
wuffs_base__pixel_config::bounds() const {
  return wuffs_base__pixel_config__bounds(this);
}

inline uint32_t  //
wuffs_base__pixel_config::width() const {
  return wuffs_base__pixel_config__width(this);
}

inline uint32_t  //
wuffs_base__pixel_config::height() const {
  return wuffs_base__pixel_config__height(this);
}

inline uint64_t  //
wuffs_base__pixel_config::pixbuf_len() const {
  return wuffs_base__pixel_config__pixbuf_len(this);
}

#endif  // __cplusplus

// --------

typedef struct {
  wuffs_base__pixel_config pixcfg;

  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    uint64_t first_frame_io_position;
    bool first_frame_is_opaque;
  } private_impl;

#ifdef __cplusplus
  inline void set(wuffs_base__pixel_format pixfmt,
                  wuffs_base__pixel_subsampling pixsub,
                  uint32_t width,
                  uint32_t height,
                  uint64_t first_frame_io_position,
                  bool first_frame_is_opaque);
  inline void invalidate();
  inline bool is_valid() const;
  inline uint64_t first_frame_io_position() const;
  inline bool first_frame_is_opaque() const;
#endif  // __cplusplus

} wuffs_base__image_config;

static inline wuffs_base__image_config  //
wuffs_base__null_image_config() {
  wuffs_base__image_config ret;
  ret.pixcfg = wuffs_base__null_pixel_config();
  ret.private_impl.first_frame_io_position = 0;
  ret.private_impl.first_frame_is_opaque = false;
  return ret;
}

// TODO: Should this function return bool? An error type?
static inline void  //
wuffs_base__image_config__set(wuffs_base__image_config* c,
                              wuffs_base__pixel_format pixfmt,
                              wuffs_base__pixel_subsampling pixsub,
                              uint32_t width,
                              uint32_t height,
                              uint64_t first_frame_io_position,
                              bool first_frame_is_opaque) {
  if (!c) {
    return;
  }
  if (wuffs_base__pixel_format__is_valid(pixfmt)) {
    c->pixcfg.private_impl.pixfmt = pixfmt;
    c->pixcfg.private_impl.pixsub = pixsub;
    c->pixcfg.private_impl.width = width;
    c->pixcfg.private_impl.height = height;
    c->private_impl.first_frame_io_position = first_frame_io_position;
    c->private_impl.first_frame_is_opaque = first_frame_is_opaque;
    return;
  }

  c->pixcfg.private_impl.pixfmt = 0;
  c->pixcfg.private_impl.pixsub = 0;
  c->pixcfg.private_impl.width = 0;
  c->pixcfg.private_impl.height = 0;
  c->private_impl.first_frame_io_position = 0;
  c->private_impl.first_frame_is_opaque = 0;
}

static inline void  //
wuffs_base__image_config__invalidate(wuffs_base__image_config* c) {
  if (c) {
    c->pixcfg.private_impl.pixfmt = 0;
    c->pixcfg.private_impl.pixsub = 0;
    c->pixcfg.private_impl.width = 0;
    c->pixcfg.private_impl.height = 0;
    c->private_impl.first_frame_io_position = 0;
    c->private_impl.first_frame_is_opaque = 0;
  }
}

static inline bool  //
wuffs_base__image_config__is_valid(const wuffs_base__image_config* c) {
  return c && wuffs_base__pixel_config__is_valid(&(c->pixcfg));
}

static inline uint64_t  //
wuffs_base__image_config__first_frame_io_position(
    const wuffs_base__image_config* c) {
  return c ? c->private_impl.first_frame_io_position : 0;
}

static inline bool  //
wuffs_base__image_config__first_frame_is_opaque(
    const wuffs_base__image_config* c) {
  return c ? c->private_impl.first_frame_is_opaque : false;
}

#ifdef __cplusplus

inline void  //
wuffs_base__image_config::set(wuffs_base__pixel_format pixfmt,
                              wuffs_base__pixel_subsampling pixsub,
                              uint32_t width,
                              uint32_t height,
                              uint64_t first_frame_io_position,
                              bool first_frame_is_opaque) {
  wuffs_base__image_config__set(this, pixfmt, pixsub, width, height,
                                first_frame_io_position, first_frame_is_opaque);
}

inline void  //
wuffs_base__image_config::invalidate() {
  wuffs_base__image_config__invalidate(this);
}

inline bool  //
wuffs_base__image_config::is_valid() const {
  return wuffs_base__image_config__is_valid(this);
}

inline uint64_t  //
wuffs_base__image_config::first_frame_io_position() const {
  return wuffs_base__image_config__first_frame_io_position(this);
}

inline bool  //
wuffs_base__image_config::first_frame_is_opaque() const {
  return wuffs_base__image_config__first_frame_is_opaque(this);
}

#endif  // __cplusplus

// --------

// wuffs_base__animation_blend encodes, for an animated image, how to blend the
// transparent pixels of this frame with the existing canvas. In Porter-Duff
// compositing operator terminology:
//  - 0 means the frame may be transparent, and should be blended "src over
//    dst", also known as just "over".
//  - 1 means the frame may be transparent, and should be blended "src".
//  - 2 means the frame is completely opaque, so that "src over dst" and "src"
//    are equivalent.
//
// These semantics are conservative. It is valid for a completely opaque frame
// to have a blend value other than 2.
typedef uint8_t wuffs_base__animation_blend;

#define WUFFS_BASE__ANIMATION_BLEND__SRC_OVER_DST \
  ((wuffs_base__animation_blend)0)
#define WUFFS_BASE__ANIMATION_BLEND__SRC ((wuffs_base__animation_blend)1)
#define WUFFS_BASE__ANIMATION_BLEND__OPAQUE ((wuffs_base__animation_blend)2)

// --------

// wuffs_base__animation_disposal encodes, for an animated image, how to
// dispose of a frame after displaying it:
//  - None means to draw the next frame on top of this one.
//  - Restore Background means to clear the frame's dirty rectangle to "the
//    background color" (in practice, this means transparent black) before
//    drawing the next frame.
//  - Restore Previous means to undo the current frame, so that the next frame
//    is drawn on top of the previous one.
typedef uint8_t wuffs_base__animation_disposal;

#define WUFFS_BASE__ANIMATION_DISPOSAL__NONE ((wuffs_base__animation_disposal)0)
#define WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_BACKGROUND \
  ((wuffs_base__animation_disposal)1)
#define WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_PREVIOUS \
  ((wuffs_base__animation_disposal)2)

// --------

typedef struct {
  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    wuffs_base__rect_ie_u32 bounds;
    wuffs_base__flicks duration;
    uint64_t index;
    uint64_t io_position;
    wuffs_base__animation_blend blend;
    wuffs_base__animation_disposal disposal;
    wuffs_base__color_u32_argb_premul background_color;
  } private_impl;

#ifdef __cplusplus
  inline void update(wuffs_base__rect_ie_u32 bounds,
                     wuffs_base__flicks duration,
                     uint64_t index,
                     uint64_t io_position,
                     wuffs_base__animation_blend blend,
                     wuffs_base__animation_disposal disposal,
                     wuffs_base__color_u32_argb_premul background_color);
  inline wuffs_base__rect_ie_u32 bounds() const;
  inline uint32_t width() const;
  inline uint32_t height() const;
  inline wuffs_base__flicks duration() const;
  inline uint64_t index() const;
  inline uint64_t io_position() const;
  inline wuffs_base__animation_blend blend() const;
  inline wuffs_base__animation_disposal disposal() const;
  inline wuffs_base__color_u32_argb_premul background_color() const;
#endif  // __cplusplus

} wuffs_base__frame_config;

static inline wuffs_base__frame_config  //
wuffs_base__null_frame_config() {
  wuffs_base__frame_config ret;
  ret.private_impl.bounds = wuffs_base__make_rect_ie_u32(0, 0, 0, 0);
  ret.private_impl.duration = 0;
  ret.private_impl.index = 0;
  ret.private_impl.io_position = 0;
  ret.private_impl.blend = 0;
  ret.private_impl.disposal = 0;
  return ret;
}

static inline void  //
wuffs_base__frame_config__update(
    wuffs_base__frame_config* c,
    wuffs_base__rect_ie_u32 bounds,
    wuffs_base__flicks duration,
    uint64_t index,
    uint64_t io_position,
    wuffs_base__animation_blend blend,
    wuffs_base__animation_disposal disposal,
    wuffs_base__color_u32_argb_premul background_color) {
  if (!c) {
    return;
  }

  c->private_impl.bounds = bounds;
  c->private_impl.duration = duration;
  c->private_impl.index = index;
  c->private_impl.io_position = io_position;
  c->private_impl.blend = blend;
  c->private_impl.disposal = disposal;
  c->private_impl.background_color = background_color;
}

static inline wuffs_base__rect_ie_u32  //
wuffs_base__frame_config__bounds(const wuffs_base__frame_config* c) {
  if (c) {
    return c->private_impl.bounds;
  }

  wuffs_base__rect_ie_u32 ret;
  ret.min_incl_x = 0;
  ret.min_incl_y = 0;
  ret.max_excl_x = 0;
  ret.max_excl_y = 0;
  return ret;
}

static inline uint32_t  //
wuffs_base__frame_config__width(const wuffs_base__frame_config* c) {
  return c ? wuffs_base__rect_ie_u32__width(&c->private_impl.bounds) : 0;
}

static inline uint32_t  //
wuffs_base__frame_config__height(const wuffs_base__frame_config* c) {
  return c ? wuffs_base__rect_ie_u32__height(&c->private_impl.bounds) : 0;
}

// wuffs_base__frame_config__duration returns the amount of time to display
// this frame. Zero means to display forever - a still (non-animated) image.
static inline wuffs_base__flicks  //
wuffs_base__frame_config__duration(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.duration : 0;
}

// wuffs_base__frame_config__index returns the index of this frame. The first
// frame in an image has index 0, the second frame has index 1, and so on.
static inline uint64_t  //
wuffs_base__frame_config__index(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.index : 0;
}

// wuffs_base__frame_config__io_position returns the I/O stream position before
// the frame config.
static inline uint64_t  //
wuffs_base__frame_config__io_position(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.io_position : 0;
}

// wuffs_base__frame_config__blend returns, for an animated image, how to blend
// the transparent pixels of this frame with the existing canvas.
static inline wuffs_base__animation_blend  //
wuffs_base__frame_config__blend(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.blend : 0;
}

// wuffs_base__frame_config__disposal returns, for an animated image, how to
// dispose of this frame after displaying it.
static inline wuffs_base__animation_disposal  //
wuffs_base__frame_config__disposal(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.disposal : 0;
}

static inline wuffs_base__color_u32_argb_premul  //
wuffs_base__frame_config__background_color(const wuffs_base__frame_config* c) {
  return c ? c->private_impl.background_color : 0;
}

#ifdef __cplusplus

inline void  //
wuffs_base__frame_config::update(
    wuffs_base__rect_ie_u32 bounds,
    wuffs_base__flicks duration,
    uint64_t index,
    uint64_t io_position,
    wuffs_base__animation_blend blend,
    wuffs_base__animation_disposal disposal,
    wuffs_base__color_u32_argb_premul background_color) {
  wuffs_base__frame_config__update(this, bounds, duration, index, io_position,
                                   blend, disposal, background_color);
}

inline wuffs_base__rect_ie_u32  //
wuffs_base__frame_config::bounds() const {
  return wuffs_base__frame_config__bounds(this);
}

inline uint32_t  //
wuffs_base__frame_config::width() const {
  return wuffs_base__frame_config__width(this);
}

inline uint32_t  //
wuffs_base__frame_config::height() const {
  return wuffs_base__frame_config__height(this);
}

inline wuffs_base__flicks  //
wuffs_base__frame_config::duration() const {
  return wuffs_base__frame_config__duration(this);
}

inline uint64_t  //
wuffs_base__frame_config::index() const {
  return wuffs_base__frame_config__index(this);
}

inline uint64_t  //
wuffs_base__frame_config::io_position() const {
  return wuffs_base__frame_config__io_position(this);
}

inline wuffs_base__animation_blend  //
wuffs_base__frame_config::blend() const {
  return wuffs_base__frame_config__blend(this);
}

inline wuffs_base__animation_disposal  //
wuffs_base__frame_config::disposal() const {
  return wuffs_base__frame_config__disposal(this);
}

inline wuffs_base__color_u32_argb_premul  //
wuffs_base__frame_config::background_color() const {
  return wuffs_base__frame_config__background_color(this);
}

#endif  // __cplusplus

// --------

typedef struct {
  wuffs_base__pixel_config pixcfg;

  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    wuffs_base__table_u8 planes[WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX];
    // TODO: color spaces.
  } private_impl;

#ifdef __cplusplus
  inline wuffs_base__status set_from_slice(
      const wuffs_base__pixel_config* pixcfg,
      wuffs_base__slice_u8 pixbuf_memory);
  inline wuffs_base__status set_from_table(
      const wuffs_base__pixel_config* pixcfg,
      wuffs_base__table_u8 pixbuf_memory);
  inline wuffs_base__slice_u8 palette();
  inline wuffs_base__pixel_format pixel_format() const;
  inline wuffs_base__table_u8 plane(uint32_t p);
#endif  // __cplusplus

} wuffs_base__pixel_buffer;

static inline wuffs_base__pixel_buffer  //
wuffs_base__null_pixel_buffer() {
  wuffs_base__pixel_buffer ret;
  ret.pixcfg = wuffs_base__null_pixel_config();
  ret.private_impl.planes[0] = wuffs_base__empty_table_u8();
  ret.private_impl.planes[1] = wuffs_base__empty_table_u8();
  ret.private_impl.planes[2] = wuffs_base__empty_table_u8();
  ret.private_impl.planes[3] = wuffs_base__empty_table_u8();
  return ret;
}

static inline wuffs_base__status  //
wuffs_base__pixel_buffer__set_from_slice(wuffs_base__pixel_buffer* b,
                                         const wuffs_base__pixel_config* pixcfg,
                                         wuffs_base__slice_u8 pixbuf_memory) {
  if (!b) {
    return wuffs_base__error__bad_receiver;
  }
  memset(b, 0, sizeof(*b));
  if (!pixcfg) {
    return wuffs_base__error__bad_argument;
  }
  if (wuffs_base__pixel_format__is_planar(pixcfg->private_impl.pixfmt)) {
    // TODO: support planar pixel formats, concious of pixel subsampling.
    return wuffs_base__error__unsupported_option;
  }
  uint32_t bits_per_pixel =
      wuffs_base__pixel_format__bits_per_pixel(pixcfg->private_impl.pixfmt);
  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
    return wuffs_base__error__unsupported_option;
  }
  uint64_t bytes_per_pixel = bits_per_pixel / 8;

  uint8_t* ptr = pixbuf_memory.ptr;
  uint64_t len = pixbuf_memory.len;
  if (wuffs_base__pixel_format__is_indexed(pixcfg->private_impl.pixfmt)) {
    // Split a 1024 byte chunk (256 palette entries × 4 bytes per entry) from
    // the start of pixbuf_memory. We split from the start, not the end, so
    // that the both chunks' pointers have the same alignment as the original
    // pointer, up to an alignment of 1024.
    if (len < 1024) {
      return wuffs_base__error__bad_argument_length_too_short;
    }
    wuffs_base__table_u8* tab =
        &b->private_impl.planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
    tab->ptr = ptr;
    tab->width = 1024;
    tab->height = 1;
    tab->stride = 1024;
    ptr += 1024;
    len -= 1024;
  }

  uint64_t wh = ((uint64_t)pixcfg->private_impl.width) *
                ((uint64_t)pixcfg->private_impl.height);
  size_t width = (size_t)(pixcfg->private_impl.width);
  if ((wh > (UINT64_MAX / bytes_per_pixel)) ||
      (width > (SIZE_MAX / bytes_per_pixel))) {
    return wuffs_base__error__bad_argument;
  }
  wh *= bytes_per_pixel;
  width *= bytes_per_pixel;
  if (wh > len) {
    return wuffs_base__error__bad_argument_length_too_short;
  }

  b->pixcfg = *pixcfg;
  wuffs_base__table_u8* tab = &b->private_impl.planes[0];
  tab->ptr = ptr;
  tab->width = width;
  tab->height = pixcfg->private_impl.height;
  tab->stride = width;
  return NULL;
}

static inline wuffs_base__status  //
wuffs_base__pixel_buffer__set_from_table(wuffs_base__pixel_buffer* b,
                                         const wuffs_base__pixel_config* pixcfg,
                                         wuffs_base__table_u8 pixbuf_memory) {
  if (!b) {
    return wuffs_base__error__bad_receiver;
  }
  memset(b, 0, sizeof(*b));
  if (!pixcfg ||
      wuffs_base__pixel_format__is_planar(pixcfg->private_impl.pixfmt)) {
    return wuffs_base__error__bad_argument;
  }
  uint32_t bits_per_pixel =
      wuffs_base__pixel_format__bits_per_pixel(pixcfg->private_impl.pixfmt);
  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
    return wuffs_base__error__unsupported_option;
  }
  uint64_t bytes_per_pixel = bits_per_pixel / 8;

  uint64_t width_in_bytes =
      ((uint64_t)pixcfg->private_impl.width) * bytes_per_pixel;
  if ((width_in_bytes > pixbuf_memory.width) ||
      (pixcfg->private_impl.height > pixbuf_memory.height)) {
    return wuffs_base__error__bad_argument;
  }

  b->pixcfg = *pixcfg;
  b->private_impl.planes[0] = pixbuf_memory;
  return NULL;
}

// wuffs_base__pixel_buffer__palette returns the palette color data. If
// non-empty, it will have length 1024.
static inline wuffs_base__slice_u8  //
wuffs_base__pixel_buffer__palette(wuffs_base__pixel_buffer* b) {
  if (b &&
      wuffs_base__pixel_format__is_indexed(b->pixcfg.private_impl.pixfmt)) {
    wuffs_base__table_u8* tab =
        &b->private_impl.planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
    if ((tab->width == 1024) && (tab->height == 1)) {
      return wuffs_base__make_slice_u8(tab->ptr, 1024);
    }
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

static inline wuffs_base__pixel_format  //
wuffs_base__pixel_buffer__pixel_format(const wuffs_base__pixel_buffer* b) {
  if (b) {
    return b->pixcfg.private_impl.pixfmt;
  }
  return WUFFS_BASE__PIXEL_FORMAT__INVALID;
}

static inline wuffs_base__table_u8  //
wuffs_base__pixel_buffer__plane(wuffs_base__pixel_buffer* b, uint32_t p) {
  if (b && (p < WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX)) {
    return b->private_impl.planes[p];
  }

  wuffs_base__table_u8 ret;
  ret.ptr = NULL;
  ret.width = 0;
  ret.height = 0;
  ret.stride = 0;
  return ret;
}

#ifdef __cplusplus

inline wuffs_base__status  //
wuffs_base__pixel_buffer::set_from_slice(const wuffs_base__pixel_config* pixcfg,
                                         wuffs_base__slice_u8 pixbuf_memory) {
  return wuffs_base__pixel_buffer__set_from_slice(this, pixcfg, pixbuf_memory);
}

inline wuffs_base__status  //
wuffs_base__pixel_buffer::set_from_table(const wuffs_base__pixel_config* pixcfg,
                                         wuffs_base__table_u8 pixbuf_memory) {
  return wuffs_base__pixel_buffer__set_from_table(this, pixcfg, pixbuf_memory);
}

inline wuffs_base__slice_u8  //
wuffs_base__pixel_buffer::palette() {
  return wuffs_base__pixel_buffer__palette(this);
}

inline wuffs_base__pixel_format  //
wuffs_base__pixel_buffer::pixel_format() const {
  return wuffs_base__pixel_buffer__pixel_format(this);
}

inline wuffs_base__table_u8  //
wuffs_base__pixel_buffer::plane(uint32_t p) {
  return wuffs_base__pixel_buffer__plane(this, p);
}

#endif  // __cplusplus

// --------

typedef struct {
  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    uint8_t TODO;
  } private_impl;

#ifdef __cplusplus
#endif  // __cplusplus

} wuffs_base__decode_frame_options;

#ifdef __cplusplus

#endif  // __cplusplus

// --------

typedef struct {
  // Do not access the private_impl's fields directly. There is no API/ABI
  // compatibility or safety guarantee if you do so.
  struct {
    // TODO: should the func type take restrict pointers?
    uint64_t (*func)(wuffs_base__slice_u8 dst,
                     wuffs_base__slice_u8 dst_palette,
                     wuffs_base__slice_u8 src);
  } private_impl;

#ifdef __cplusplus
  inline wuffs_base__status prepare(wuffs_base__pixel_format dst_format,
                                    wuffs_base__slice_u8 dst_palette,
                                    wuffs_base__pixel_format src_format,
                                    wuffs_base__slice_u8 src_palette);
  inline uint64_t swizzle_interleaved(wuffs_base__slice_u8 dst,
                                      wuffs_base__slice_u8 dst_palette,
                                      wuffs_base__slice_u8 src) const;
#endif  // __cplusplus

} wuffs_base__pixel_swizzler;

wuffs_base__status  //
wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
                                    wuffs_base__pixel_format dst_format,
                                    wuffs_base__slice_u8 dst_palette,
                                    wuffs_base__pixel_format src_format,
                                    wuffs_base__slice_u8 src_palette);

uint64_t  //
wuffs_base__pixel_swizzler__swizzle_interleaved(
    const wuffs_base__pixel_swizzler* p,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src);

#ifdef __cplusplus

inline wuffs_base__status  //
wuffs_base__pixel_swizzler::prepare(wuffs_base__pixel_format dst_format,
                                    wuffs_base__slice_u8 dst_palette,
                                    wuffs_base__pixel_format src_format,
                                    wuffs_base__slice_u8 src_palette) {
  return wuffs_base__pixel_swizzler__prepare(this, dst_format, dst_palette,
                                             src_format, src_palette);
}

uint64_t  //
wuffs_base__pixel_swizzler::swizzle_interleaved(
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src) const {
  return wuffs_base__pixel_swizzler__swizzle_interleaved(this, dst, dst_palette,
                                                         src);
}

#endif  // __cplusplus

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __clang__
#pragma clang diagnostic pop
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

// ---------------- Public Consts

// ---------------- Struct Declarations

typedef struct wuffs_adler32__hasher__struct wuffs_adler32__hasher;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_adler32__hasher__initialize(wuffs_adler32__hasher* self,
                                  size_t sizeof_star_self,
                                  uint64_t wuffs_version,
                                  uint32_t initialize_flags);

size_t  //
sizeof__wuffs_adler32__hasher();

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_adler32__hasher__update_u32(wuffs_adler32__hasher* self,
                                  wuffs_base__slice_u8 a_x);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_adler32__hasher__struct {
#ifdef WUFFS_IMPLEMENTATION

  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;

    uint32_t f_state;
    bool f_started;

  } private_impl;

#else  // WUFFS_IMPLEMENTATION

  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
  // large enough to discourage trying to allocate one on the stack. The sizeof
  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
  // struct) is not part of the public, stable, memory-safe API. Call
  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
  // first argument) instead of fiddling with bar.private_impl.qux fields.
  //
  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
  // defines C++ convenience methods. These methods forward on "this", so that
  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
 private:
  union {
    uint32_t align_as_per_magic_field;
    uint8_t placeholder[1073741824];  // 1 GiB.
  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;

 public:

#endif  // WUFFS_IMPLEMENTATION

#ifdef __cplusplus

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
  initialize(size_t sizeof_star_self,
             uint64_t wuffs_version,
             uint32_t initialize_flags) {
    return wuffs_adler32__hasher__initialize(this, sizeof_star_self,
                                             wuffs_version, initialize_flags);
  }

  inline uint32_t  //
  update_u32(wuffs_base__slice_u8 a_x) {
    return wuffs_adler32__hasher__update_u32(this, a_x);
  }

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow copy and assign.
  wuffs_adler32__hasher__struct(const wuffs_adler32__hasher__struct&) = delete;
  wuffs_adler32__hasher__struct& operator=(
      const wuffs_adler32__hasher__struct&) = delete;
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

#endif  // __cplusplus

};  // struct wuffs_adler32__hasher__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

// ---------------- Public Consts

// ---------------- Struct Declarations

typedef struct wuffs_crc32__ieee_hasher__struct wuffs_crc32__ieee_hasher;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_crc32__ieee_hasher__initialize(wuffs_crc32__ieee_hasher* self,
                                     size_t sizeof_star_self,
                                     uint64_t wuffs_version,
                                     uint32_t initialize_flags);

size_t  //
sizeof__wuffs_crc32__ieee_hasher();

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_crc32__ieee_hasher__update_u32(wuffs_crc32__ieee_hasher* self,
                                     wuffs_base__slice_u8 a_x);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_crc32__ieee_hasher__struct {
#ifdef WUFFS_IMPLEMENTATION

  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;

    uint32_t f_state;

  } private_impl;

#else  // WUFFS_IMPLEMENTATION

  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
  // large enough to discourage trying to allocate one on the stack. The sizeof
  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
  // struct) is not part of the public, stable, memory-safe API. Call
  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
  // first argument) instead of fiddling with bar.private_impl.qux fields.
  //
  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
  // defines C++ convenience methods. These methods forward on "this", so that
  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
 private:
  union {
    uint32_t align_as_per_magic_field;
    uint8_t placeholder[1073741824];  // 1 GiB.
  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;

 public:

#endif  // WUFFS_IMPLEMENTATION

#ifdef __cplusplus

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
  initialize(size_t sizeof_star_self,
             uint64_t wuffs_version,
             uint32_t initialize_flags) {
    return wuffs_crc32__ieee_hasher__initialize(
        this, sizeof_star_self, wuffs_version, initialize_flags);
  }

  inline uint32_t  //
  update_u32(wuffs_base__slice_u8 a_x) {
    return wuffs_crc32__ieee_hasher__update_u32(this, a_x);
  }

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow copy and assign.
  wuffs_crc32__ieee_hasher__struct(const wuffs_crc32__ieee_hasher__struct&) =
      delete;
  wuffs_crc32__ieee_hasher__struct& operator=(
      const wuffs_crc32__ieee_hasher__struct&) = delete;
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

#endif  // __cplusplus

};  // struct wuffs_crc32__ieee_hasher__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char* wuffs_deflate__error__bad_huffman_code_over_subscribed;
extern const char* wuffs_deflate__error__bad_huffman_code_under_subscribed;
extern const char* wuffs_deflate__error__bad_huffman_code_length_count;
extern const char* wuffs_deflate__error__bad_huffman_code_length_repetition;
extern const char* wuffs_deflate__error__bad_huffman_code;
extern const char* wuffs_deflate__error__bad_huffman_minimum_code_length;
extern const char* wuffs_deflate__error__bad_block;
extern const char* wuffs_deflate__error__bad_distance;
extern const char* wuffs_deflate__error__bad_distance_code_count;
extern const char* wuffs_deflate__error__bad_literal_length_code_count;
extern const char* wuffs_deflate__error__inconsistent_stored_block_length;
extern const char* wuffs_deflate__error__missing_end_of_block_code;
extern const char* wuffs_deflate__error__no_huffman_codes;

// ---------------- Public Consts

#define WUFFS_DEFLATE__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1

// ---------------- Struct Declarations

typedef struct wuffs_deflate__decoder__struct wuffs_deflate__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_deflate__decoder__initialize(wuffs_deflate__decoder* self,
                                   size_t sizeof_star_self,
                                   uint64_t wuffs_version,
                                   uint32_t initialize_flags);

size_t  //
sizeof__wuffs_deflate__decoder();

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_deflate__decoder__add_history(wuffs_deflate__decoder* self,
                                    wuffs_base__slice_u8 a_hist);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_deflate__decoder__workbuf_len(const wuffs_deflate__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_deflate__decoder__decode_io_writer(wuffs_deflate__decoder* self,
                                         wuffs_base__io_buffer* a_dst,
                                         wuffs_base__io_buffer* a_src,
                                         wuffs_base__slice_u8 a_workbuf);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_deflate__decoder__struct {
#ifdef WUFFS_IMPLEMENTATION

  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;

    uint32_t f_bits;
    uint32_t f_n_bits;
    uint32_t f_history_index;
    uint32_t f_n_huffs_bits[2];
    bool f_end_of_block;

    uint32_t p_decode_io_writer[1];
    uint32_t p_decode_blocks[1];
    uint32_t p_decode_uncompressed[1];
    uint32_t p_init_dynamic_huffman[1];
    uint32_t p_decode_huffman_slow[1];
  } private_impl;

  struct {
    uint32_t f_huffs[2][1024];
    uint8_t f_history[32768];
    uint8_t f_code_lengths[320];

    struct {
      uint32_t v_final;
    } s_decode_blocks[1];
    struct {
      uint32_t v_length;
      uint64_t scratch;
    } s_decode_uncompressed[1];
    struct {
      uint32_t v_bits;
      uint32_t v_n_bits;
      uint32_t v_n_lit;
      uint32_t v_n_dist;
      uint32_t v_n_clen;
      uint32_t v_i;
      uint32_t v_mask;
      uint32_t v_table_entry;
      uint32_t v_n_extra_bits;
      uint8_t v_rep_symbol;
      uint32_t v_rep_count;
    } s_init_dynamic_huffman[1];
    struct {
      uint32_t v_bits;
      uint32_t v_n_bits;
      uint32_t v_table_entry;
      uint32_t v_table_entry_n_bits;
      uint32_t v_lmask;
      uint32_t v_dmask;
      uint32_t v_redir_top;
      uint32_t v_redir_mask;
      uint32_t v_length;
      uint32_t v_dist_minus_1;
      uint32_t v_hlen;
      uint32_t v_hdist;
    } s_decode_huffman_slow[1];
  } private_data;

#else  // WUFFS_IMPLEMENTATION

  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
  // large enough to discourage trying to allocate one on the stack. The sizeof
  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
  // struct) is not part of the public, stable, memory-safe API. Call
  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
  // first argument) instead of fiddling with bar.private_impl.qux fields.
  //
  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
  // defines C++ convenience methods. These methods forward on "this", so that
  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
 private:
  union {
    uint32_t align_as_per_magic_field;
    uint8_t placeholder[1073741824];  // 1 GiB.
  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;

 public:

#endif  // WUFFS_IMPLEMENTATION

#ifdef __cplusplus

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
  initialize(size_t sizeof_star_self,
             uint64_t wuffs_version,
             uint32_t initialize_flags) {
    return wuffs_deflate__decoder__initialize(this, sizeof_star_self,
                                              wuffs_version, initialize_flags);
  }

  inline wuffs_base__empty_struct  //
  add_history(wuffs_base__slice_u8 a_hist) {
    return wuffs_deflate__decoder__add_history(this, a_hist);
  }

  inline wuffs_base__range_ii_u64  //
  workbuf_len() const {
    return wuffs_deflate__decoder__workbuf_len(this);
  }

  inline wuffs_base__status  //
  decode_io_writer(wuffs_base__io_buffer* a_dst,
                   wuffs_base__io_buffer* a_src,
                   wuffs_base__slice_u8 a_workbuf) {
    return wuffs_deflate__decoder__decode_io_writer(this, a_dst, a_src,
                                                    a_workbuf);
  }

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow copy and assign.
  wuffs_deflate__decoder__struct(const wuffs_deflate__decoder__struct&) =
      delete;
  wuffs_deflate__decoder__struct& operator=(
      const wuffs_deflate__decoder__struct&) = delete;
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

#endif  // __cplusplus

};  // struct wuffs_deflate__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char* wuffs_lzw__error__bad_code;

// ---------------- Public Consts

#define WUFFS_LZW__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0

// ---------------- Struct Declarations

typedef struct wuffs_lzw__decoder__struct wuffs_lzw__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_lzw__decoder__initialize(wuffs_lzw__decoder* self,
                               size_t sizeof_star_self,
                               uint64_t wuffs_version,
                               uint32_t initialize_flags);

size_t  //
sizeof__wuffs_lzw__decoder();

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_lzw__decoder__set_literal_width(wuffs_lzw__decoder* self, uint32_t a_lw);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_lzw__decoder__workbuf_len(const wuffs_lzw__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_lzw__decoder__decode_io_writer(wuffs_lzw__decoder* self,
                                     wuffs_base__io_buffer* a_dst,
                                     wuffs_base__io_buffer* a_src,
                                     wuffs_base__slice_u8 a_workbuf);

WUFFS_BASE__MAYBE_STATIC wuffs_base__slice_u8  //
wuffs_lzw__decoder__flush(wuffs_lzw__decoder* self);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_lzw__decoder__struct {
#ifdef WUFFS_IMPLEMENTATION

  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;

    uint32_t f_set_literal_width_arg;
    uint32_t f_literal_width;
    uint32_t f_clear_code;
    uint32_t f_end_code;
    uint32_t f_save_code;
    uint32_t f_prev_code;
    uint32_t f_width;
    uint32_t f_bits;
    uint32_t f_n_bits;
    uint32_t f_output_ri;
    uint32_t f_output_wi;
    uint32_t f_read_from_return_value;
    uint16_t f_prefixes[4096];

    uint32_t p_decode_io_writer[1];
    uint32_t p_write_to[1];
  } private_impl;

  struct {
    uint8_t f_suffixes[4096][8];
    uint16_t f_lm1s[4096];
    uint8_t f_output[8199];

  } private_data;

#else  // WUFFS_IMPLEMENTATION

  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
  // large enough to discourage trying to allocate one on the stack. The sizeof
  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
  // struct) is not part of the public, stable, memory-safe API. Call
  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
  // first argument) instead of fiddling with bar.private_impl.qux fields.
  //
  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
  // defines C++ convenience methods. These methods forward on "this", so that
  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
 private:
  union {
    uint32_t align_as_per_magic_field;
    uint8_t placeholder[1073741824];  // 1 GiB.
  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;

 public:

#endif  // WUFFS_IMPLEMENTATION

#ifdef __cplusplus

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
  initialize(size_t sizeof_star_self,
             uint64_t wuffs_version,
             uint32_t initialize_flags) {
    return wuffs_lzw__decoder__initialize(this, sizeof_star_self, wuffs_version,
                                          initialize_flags);
  }

  inline wuffs_base__empty_struct  //
  set_literal_width(uint32_t a_lw) {
    return wuffs_lzw__decoder__set_literal_width(this, a_lw);
  }

  inline wuffs_base__range_ii_u64  //
  workbuf_len() const {
    return wuffs_lzw__decoder__workbuf_len(this);
  }

  inline wuffs_base__status  //
  decode_io_writer(wuffs_base__io_buffer* a_dst,
                   wuffs_base__io_buffer* a_src,
                   wuffs_base__slice_u8 a_workbuf) {
    return wuffs_lzw__decoder__decode_io_writer(this, a_dst, a_src, a_workbuf);
  }

  inline wuffs_base__slice_u8  //
  flush() {
    return wuffs_lzw__decoder__flush(this);
  }

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow copy and assign.
  wuffs_lzw__decoder__struct(const wuffs_lzw__decoder__struct&) = delete;
  wuffs_lzw__decoder__struct& operator=(const wuffs_lzw__decoder__struct&) =
      delete;
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

#endif  // __cplusplus

};  // struct wuffs_lzw__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char* wuffs_gif__error__bad_block;
extern const char* wuffs_gif__error__bad_extension_label;
extern const char* wuffs_gif__error__bad_frame_size;
extern const char* wuffs_gif__error__bad_graphic_control;
extern const char* wuffs_gif__error__bad_header;
extern const char* wuffs_gif__error__bad_literal_width;
extern const char* wuffs_gif__error__bad_palette;

// ---------------- Public Consts

#define WUFFS_GIF__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1

#define WUFFS_GIF__QUIRK_DELAY_NUM_DECODED_FRAMES 1041635328

#define WUFFS_GIF__QUIRK_FIRST_FRAME_LOCAL_PALETTE_MEANS_BLACK_BACKGROUND \
  1041635329

#define WUFFS_GIF__QUIRK_HONOR_BACKGROUND_COLOR 1041635330

#define WUFFS_GIF__QUIRK_IGNORE_TOO_MUCH_PIXEL_DATA 1041635331

#define WUFFS_GIF__QUIRK_IMAGE_BOUNDS_ARE_STRICT 1041635332

#define WUFFS_GIF__QUIRK_REJECT_EMPTY_FRAME 1041635333

#define WUFFS_GIF__QUIRK_REJECT_EMPTY_PALETTE 1041635334

// ---------------- Struct Declarations

typedef struct wuffs_gif__decoder__struct wuffs_gif__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_gif__decoder__initialize(wuffs_gif__decoder* self,
                               size_t sizeof_star_self,
                               uint64_t wuffs_version,
                               uint32_t initialize_flags);

size_t  //
sizeof__wuffs_gif__decoder();

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gif__decoder__set_quirk_enabled(wuffs_gif__decoder* self,
                                      uint32_t a_quirk,
                                      bool a_enabled);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__decode_image_config(wuffs_gif__decoder* self,
                                        wuffs_base__image_config* a_dst,
                                        wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gif__decoder__set_report_metadata(wuffs_gif__decoder* self,
                                        uint32_t a_fourcc,
                                        bool a_report);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__ack_metadata_chunk(wuffs_gif__decoder* self,
                                       wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_gif__decoder__metadata_fourcc(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__metadata_chunk_length(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_gif__decoder__num_animation_loops(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__num_decoded_frame_configs(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__num_decoded_frames(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32  //
wuffs_gif__decoder__frame_dirty_rect(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_gif__decoder__workbuf_len(const wuffs_gif__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__restart_frame(wuffs_gif__decoder* self,
                                  uint64_t a_index,
                                  uint64_t a_io_position);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__decode_frame_config(wuffs_gif__decoder* self,
                                        wuffs_base__frame_config* a_dst,
                                        wuffs_base__io_buffer* a_src);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__decode_frame(wuffs_gif__decoder* self,
                                 wuffs_base__pixel_buffer* a_dst,
                                 wuffs_base__io_buffer* a_src,
                                 wuffs_base__slice_u8 a_workbuf,
                                 wuffs_base__decode_frame_options* a_opts);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_gif__decoder__struct {
#ifdef WUFFS_IMPLEMENTATION

  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;

    uint32_t f_width;
    uint32_t f_height;
    uint8_t f_call_sequence;
    bool f_ignore_metadata;
    bool f_report_metadata_iccp;
    bool f_report_metadata_xmp;
    uint32_t f_metadata_fourcc_value;
    uint64_t f_metadata_chunk_length_value;
    uint64_t f_metadata_io_position;
    bool f_quirk_enabled_delay_num_decoded_frames;
    bool f_quirk_enabled_first_frame_local_palette_means_black_background;
    bool f_quirk_enabled_honor_background_color;
    bool f_quirk_enabled_ignore_too_much_pixel_data;
    bool f_quirk_enabled_image_bounds_are_strict;
    bool f_quirk_enabled_reject_empty_frame;
    bool f_quirk_enabled_reject_empty_palette;
    bool f_delayed_num_decoded_frames;
    bool f_end_of_data;
    bool f_restarted;
    bool f_previous_lzw_decode_ended_abruptly;
    bool f_has_global_palette;
    uint8_t f_interlace;
    bool f_seen_num_loops;
    uint32_t f_num_loops;
    uint32_t f_background_color_u32_argb_premul;
    uint32_t f_black_color_u32_argb_premul;
    bool f_gc_has_transparent_index;
    uint8_t f_gc_transparent_index;
    uint8_t f_gc_disposal;
    uint64_t f_gc_duration;
    uint64_t f_frame_config_io_position;
    uint64_t f_num_decoded_frame_configs_value;
    uint64_t f_num_decoded_frames_value;
    uint32_t f_frame_rect_x0;
    uint32_t f_frame_rect_y0;
    uint32_t f_frame_rect_x1;
    uint32_t f_frame_rect_y1;
    uint32_t f_dst_x;
    uint32_t f_dst_y;
    uint32_t f_dirty_max_excl_y;
    uint64_t f_compressed_ri;
    uint64_t f_compressed_wi;
    wuffs_base__pixel_swizzler f_swizzler;

    uint32_t p_decode_image_config[1];
    uint32_t p_ack_metadata_chunk[1];
    uint32_t p_decode_frame_config[1];
    uint32_t p_skip_frame[1];
    uint32_t p_decode_frame[1];
    uint32_t p_decode_up_to_id_part1[1];
    uint32_t p_decode_header[1];
    uint32_t p_decode_lsd[1];
    uint32_t p_decode_extension[1];
    uint32_t p_skip_blocks[1];
    uint32_t p_decode_ae[1];
    uint32_t p_decode_gc[1];
    uint32_t p_decode_id_part0[1];
    uint32_t p_decode_id_part1[1];
    uint32_t p_decode_id_part2[1];
  } private_impl;

  struct {
    uint8_t f_compressed[4096];
    uint8_t f_palettes[2][1024];
    uint8_t f_dst_palette[1024];
    wuffs_lzw__decoder f_lzw;

    struct {
      uint8_t v_blend;
      uint32_t v_background_color;
    } s_decode_frame_config[1];
    struct {
      uint64_t scratch;
    } s_skip_frame[1];
    struct {
      uint8_t v_c[6];
      uint32_t v_i;
    } s_decode_header[1];
    struct {
      uint8_t v_flags;
      uint8_t v_background_color_index;
      uint32_t v_num_palette_entries;
      uint32_t v_i;
      uint64_t scratch;
    } s_decode_lsd[1];
    struct {
      uint64_t scratch;
    } s_skip_blocks[1];
    struct {
      uint8_t v_block_size;
      bool v_is_animexts;
      bool v_is_netscape;
      bool v_is_iccp;
      bool v_is_xmp;
      uint64_t scratch;
    } s_decode_ae[1];
    struct {
      uint64_t scratch;
    } s_decode_gc[1];
    struct {
      uint64_t scratch;
    } s_decode_id_part0[1];
    struct {
      uint8_t v_which_palette;
      uint32_t v_num_palette_entries;
      uint32_t v_i;
      uint64_t scratch;
    } s_decode_id_part1[1];
    struct {
      uint64_t v_block_size;
      bool v_need_block_size;
      wuffs_base__status v_lzw_status;
      uint64_t scratch;
    } s_decode_id_part2[1];
  } private_data;

#else  // WUFFS_IMPLEMENTATION

  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
  // large enough to discourage trying to allocate one on the stack. The sizeof
  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
  // struct) is not part of the public, stable, memory-safe API. Call
  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
  // first argument) instead of fiddling with bar.private_impl.qux fields.
  //
  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
  // defines C++ convenience methods. These methods forward on "this", so that
  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
 private:
  union {
    uint32_t align_as_per_magic_field;
    uint8_t placeholder[1073741824];  // 1 GiB.
  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;

 public:

#endif  // WUFFS_IMPLEMENTATION

#ifdef __cplusplus

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
  initialize(size_t sizeof_star_self,
             uint64_t wuffs_version,
             uint32_t initialize_flags) {
    return wuffs_gif__decoder__initialize(this, sizeof_star_self, wuffs_version,
                                          initialize_flags);
  }

  inline wuffs_base__empty_struct  //
  set_quirk_enabled(uint32_t a_quirk, bool a_enabled) {
    return wuffs_gif__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
  }

  inline wuffs_base__status  //
  decode_image_config(wuffs_base__image_config* a_dst,
                      wuffs_base__io_buffer* a_src) {
    return wuffs_gif__decoder__decode_image_config(this, a_dst, a_src);
  }

  inline wuffs_base__empty_struct  //
  set_report_metadata(uint32_t a_fourcc, bool a_report) {
    return wuffs_gif__decoder__set_report_metadata(this, a_fourcc, a_report);
  }

  inline wuffs_base__status  //
  ack_metadata_chunk(wuffs_base__io_buffer* a_src) {
    return wuffs_gif__decoder__ack_metadata_chunk(this, a_src);
  }

  inline uint32_t  //
  metadata_fourcc() const {
    return wuffs_gif__decoder__metadata_fourcc(this);
  }

  inline uint64_t  //
  metadata_chunk_length() const {
    return wuffs_gif__decoder__metadata_chunk_length(this);
  }

  inline uint32_t  //
  num_animation_loops() const {
    return wuffs_gif__decoder__num_animation_loops(this);
  }

  inline uint64_t  //
  num_decoded_frame_configs() const {
    return wuffs_gif__decoder__num_decoded_frame_configs(this);
  }

  inline uint64_t  //
  num_decoded_frames() const {
    return wuffs_gif__decoder__num_decoded_frames(this);
  }

  inline wuffs_base__rect_ie_u32  //
  frame_dirty_rect() const {
    return wuffs_gif__decoder__frame_dirty_rect(this);
  }

  inline wuffs_base__range_ii_u64  //
  workbuf_len() const {
    return wuffs_gif__decoder__workbuf_len(this);
  }

  inline wuffs_base__status  //
  restart_frame(uint64_t a_index, uint64_t a_io_position) {
    return wuffs_gif__decoder__restart_frame(this, a_index, a_io_position);
  }

  inline wuffs_base__status  //
  decode_frame_config(wuffs_base__frame_config* a_dst,
                      wuffs_base__io_buffer* a_src) {
    return wuffs_gif__decoder__decode_frame_config(this, a_dst, a_src);
  }

  inline wuffs_base__status  //
  decode_frame(wuffs_base__pixel_buffer* a_dst,
               wuffs_base__io_buffer* a_src,
               wuffs_base__slice_u8 a_workbuf,
               wuffs_base__decode_frame_options* a_opts) {
    return wuffs_gif__decoder__decode_frame(this, a_dst, a_src, a_workbuf,
                                            a_opts);
  }

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow copy and assign.
  wuffs_gif__decoder__struct(const wuffs_gif__decoder__struct&) = delete;
  wuffs_gif__decoder__struct& operator=(const wuffs_gif__decoder__struct&) =
      delete;
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

#endif  // __cplusplus

};  // struct wuffs_gif__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char* wuffs_gzip__error__bad_checksum;
extern const char* wuffs_gzip__error__bad_compression_method;
extern const char* wuffs_gzip__error__bad_encoding_flags;
extern const char* wuffs_gzip__error__bad_header;

// ---------------- Public Consts

#define WUFFS_GZIP__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1

// ---------------- Struct Declarations

typedef struct wuffs_gzip__decoder__struct wuffs_gzip__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_gzip__decoder__initialize(wuffs_gzip__decoder* self,
                                size_t sizeof_star_self,
                                uint64_t wuffs_version,
                                uint32_t initialize_flags);

size_t  //
sizeof__wuffs_gzip__decoder();

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gzip__decoder__set_ignore_checksum(wuffs_gzip__decoder* self, bool a_ic);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_gzip__decoder__workbuf_len(const wuffs_gzip__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gzip__decoder__decode_io_writer(wuffs_gzip__decoder* self,
                                      wuffs_base__io_buffer* a_dst,
                                      wuffs_base__io_buffer* a_src,
                                      wuffs_base__slice_u8 a_workbuf);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_gzip__decoder__struct {
#ifdef WUFFS_IMPLEMENTATION

  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;

    bool f_ignore_checksum;

    uint32_t p_decode_io_writer[1];
  } private_impl;

  struct {
    wuffs_crc32__ieee_hasher f_checksum;
    wuffs_deflate__decoder f_flate;

    struct {
      uint8_t v_flags;
      uint32_t v_checksum_got;
      uint32_t v_decoded_length_got;
      uint32_t v_checksum_want;
      uint64_t scratch;
    } s_decode_io_writer[1];
  } private_data;

#else  // WUFFS_IMPLEMENTATION

  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
  // large enough to discourage trying to allocate one on the stack. The sizeof
  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
  // struct) is not part of the public, stable, memory-safe API. Call
  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
  // first argument) instead of fiddling with bar.private_impl.qux fields.
  //
  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
  // defines C++ convenience methods. These methods forward on "this", so that
  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
 private:
  union {
    uint32_t align_as_per_magic_field;
    uint8_t placeholder[1073741824];  // 1 GiB.
  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;

 public:

#endif  // WUFFS_IMPLEMENTATION

#ifdef __cplusplus

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
  initialize(size_t sizeof_star_self,
             uint64_t wuffs_version,
             uint32_t initialize_flags) {
    return wuffs_gzip__decoder__initialize(this, sizeof_star_self,
                                           wuffs_version, initialize_flags);
  }

  inline wuffs_base__empty_struct  //
  set_ignore_checksum(bool a_ic) {
    return wuffs_gzip__decoder__set_ignore_checksum(this, a_ic);
  }

  inline wuffs_base__range_ii_u64  //
  workbuf_len() const {
    return wuffs_gzip__decoder__workbuf_len(this);
  }

  inline wuffs_base__status  //
  decode_io_writer(wuffs_base__io_buffer* a_dst,
                   wuffs_base__io_buffer* a_src,
                   wuffs_base__slice_u8 a_workbuf) {
    return wuffs_gzip__decoder__decode_io_writer(this, a_dst, a_src, a_workbuf);
  }

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow copy and assign.
  wuffs_gzip__decoder__struct(const wuffs_gzip__decoder__struct&) = delete;
  wuffs_gzip__decoder__struct& operator=(const wuffs_gzip__decoder__struct&) =
      delete;
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

#endif  // __cplusplus

};  // struct wuffs_gzip__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __cplusplus
extern "C" {
#endif

// ---------------- Status Codes

extern const char* wuffs_zlib__warning__dictionary_required;
extern const char* wuffs_zlib__error__bad_checksum;
extern const char* wuffs_zlib__error__bad_compression_method;
extern const char* wuffs_zlib__error__bad_compression_window_size;
extern const char* wuffs_zlib__error__bad_parity_check;
extern const char* wuffs_zlib__error__incorrect_dictionary;

// ---------------- Public Consts

#define WUFFS_ZLIB__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1

// ---------------- Struct Declarations

typedef struct wuffs_zlib__decoder__struct wuffs_zlib__decoder;

// ---------------- Public Initializer Prototypes

// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
//
// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_zlib__decoder__initialize(wuffs_zlib__decoder* self,
                                size_t sizeof_star_self,
                                uint64_t wuffs_version,
                                uint32_t initialize_flags);

size_t  //
sizeof__wuffs_zlib__decoder();

// ---------------- Public Function Prototypes

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_zlib__decoder__dictionary_id(const wuffs_zlib__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_zlib__decoder__add_dictionary(wuffs_zlib__decoder* self,
                                    wuffs_base__slice_u8 a_dict);

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_zlib__decoder__set_ignore_checksum(wuffs_zlib__decoder* self, bool a_ic);

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_zlib__decoder__workbuf_len(const wuffs_zlib__decoder* self);

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_zlib__decoder__decode_io_writer(wuffs_zlib__decoder* self,
                                      wuffs_base__io_buffer* a_dst,
                                      wuffs_base__io_buffer* a_src,
                                      wuffs_base__slice_u8 a_workbuf);

// ---------------- Struct Definitions

// These structs' fields, and the sizeof them, are private implementation
// details that aren't guaranteed to be stable across Wuffs versions.
//
// See https://en.wikipedia.org/wiki/Opaque_pointer#C

#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

struct wuffs_zlib__decoder__struct {
#ifdef WUFFS_IMPLEMENTATION

  // Do not access the private_impl's or private_data's fields directly. There
  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
  // the wuffs_foo__bar__baz functions.
  //
  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.

  struct {
    uint32_t magic;
    uint32_t active_coroutine;

    bool f_bad_call_sequence;
    bool f_header_complete;
    bool f_got_dictionary;
    bool f_want_dictionary;
    bool f_ignore_checksum;
    uint32_t f_dict_id_got;
    uint32_t f_dict_id_want;

    uint32_t p_decode_io_writer[1];
  } private_impl;

  struct {
    wuffs_adler32__hasher f_checksum;
    wuffs_adler32__hasher f_dict_id_hasher;
    wuffs_deflate__decoder f_flate;

    struct {
      uint32_t v_checksum_got;
      uint64_t scratch;
    } s_decode_io_writer[1];
  } private_data;

#else  // WUFFS_IMPLEMENTATION

  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
  // large enough to discourage trying to allocate one on the stack. The sizeof
  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
  // struct) is not part of the public, stable, memory-safe API. Call
  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
  // first argument) instead of fiddling with bar.private_impl.qux fields.
  //
  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
  // defines C++ convenience methods. These methods forward on "this", so that
  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
 private:
  union {
    uint32_t align_as_per_magic_field;
    uint8_t placeholder[1073741824];  // 1 GiB.
  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;

 public:

#endif  // WUFFS_IMPLEMENTATION

#ifdef __cplusplus

  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
  initialize(size_t sizeof_star_self,
             uint64_t wuffs_version,
             uint32_t initialize_flags) {
    return wuffs_zlib__decoder__initialize(this, sizeof_star_self,
                                           wuffs_version, initialize_flags);
  }

  inline uint32_t  //
  dictionary_id() const {
    return wuffs_zlib__decoder__dictionary_id(this);
  }

  inline wuffs_base__empty_struct  //
  add_dictionary(wuffs_base__slice_u8 a_dict) {
    return wuffs_zlib__decoder__add_dictionary(this, a_dict);
  }

  inline wuffs_base__empty_struct  //
  set_ignore_checksum(bool a_ic) {
    return wuffs_zlib__decoder__set_ignore_checksum(this, a_ic);
  }

  inline wuffs_base__range_ii_u64  //
  workbuf_len() const {
    return wuffs_zlib__decoder__workbuf_len(this);
  }

  inline wuffs_base__status  //
  decode_io_writer(wuffs_base__io_buffer* a_dst,
                   wuffs_base__io_buffer* a_src,
                   wuffs_base__slice_u8 a_workbuf) {
    return wuffs_zlib__decoder__decode_io_writer(this, a_dst, a_src, a_workbuf);
  }

#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
  // Disallow copy and assign.
  wuffs_zlib__decoder__struct(const wuffs_zlib__decoder__struct&) = delete;
  wuffs_zlib__decoder__struct& operator=(const wuffs_zlib__decoder__struct&) =
      delete;
#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)

#endif  // __cplusplus

};  // struct wuffs_zlib__decoder__struct

#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)

#ifdef __cplusplus
}  // extern "C"
#endif

// WUFFS C HEADER ENDS HERE.
#ifdef WUFFS_IMPLEMENTATION

// GCC does not warn for unused *static inline* functions, but clang does.
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-function"
#endif

#ifdef __cplusplus
extern "C" {
#endif

static inline wuffs_base__empty_struct  //
wuffs_base__ignore_status(wuffs_base__status z) {
  return wuffs_base__make_empty_struct();
}

// WUFFS_BASE__MAGIC is a magic number to check that initializers are called.
// It's not foolproof, given C doesn't automatically zero memory before use,
// but it should catch 99.99% of cases.
//
// Its (non-zero) value is arbitrary, based on md5sum("wuffs").
#define WUFFS_BASE__MAGIC ((uint32_t)0x3CCB6C71)

// WUFFS_BASE__DISABLED is a magic number to indicate that a non-recoverable
// error was previously encountered.
//
// Its (non-zero) value is arbitrary, based on md5sum("disabled").
#define WUFFS_BASE__DISABLED ((uint32_t)0x075AE3D2)

// Denote intentional fallthroughs for -Wimplicit-fallthrough.
//
// The order matters here. Clang also defines "__GNUC__".
#if defined(__clang__) && defined(__cplusplus) && (__cplusplus >= 201103L)
#define WUFFS_BASE__FALLTHROUGH [[clang::fallthrough]]
#elif !defined(__clang__) && defined(__GNUC__) && (__GNUC__ >= 7)
#define WUFFS_BASE__FALLTHROUGH __attribute__((fallthrough))
#else
#define WUFFS_BASE__FALLTHROUGH
#endif

// Use switch cases for coroutine suspension points, similar to the technique
// in https://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
//
// We use trivial macros instead of an explicit assignment and case statement
// so that clang-format doesn't get confused by the unusual "case"s.
#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0 case 0:;
#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT(n) \
  coro_susp_point = n;                            \
  WUFFS_BASE__FALLTHROUGH;                        \
  case n:;

#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(n) \
  if (!status) {                                                \
    goto ok;                                                    \
  } else if (*status != '$') {                                  \
    goto exit;                                                  \
  }                                                             \
  coro_susp_point = n;                                          \
  goto suspend;                                                 \
  case n:;

// Clang also defines "__GNUC__".
#if defined(__GNUC__)
#define WUFFS_BASE__LIKELY(expr) (__builtin_expect(!!(expr), 1))
#define WUFFS_BASE__UNLIKELY(expr) (__builtin_expect(!!(expr), 0))
#else
#define WUFFS_BASE__LIKELY(expr) (expr)
#define WUFFS_BASE__UNLIKELY(expr) (expr)
#endif

// The helpers below are functions, instead of macros, because their arguments
// can be an expression that we shouldn't evaluate more than once.
//
// They are static, so that linking multiple wuffs .o files won't complain about
// duplicate function definitions.
//
// They are explicitly marked inline, even if modern compilers don't use the
// inline attribute to guide optimizations such as inlining, to avoid the
// -Wunused-function warning, and we like to compile with -Wall -Werror.

// ---------------- Numeric Types

static inline uint8_t  //
wuffs_base__load_u8be(uint8_t* p) {
  return p[0];
}

static inline uint16_t  //
wuffs_base__load_u16be(uint8_t* p) {
  return (uint16_t)(((uint16_t)(p[0]) << 8) | ((uint16_t)(p[1]) << 0));
}

static inline uint16_t  //
wuffs_base__load_u16le(uint8_t* p) {
  return (uint16_t)(((uint16_t)(p[0]) << 0) | ((uint16_t)(p[1]) << 8));
}

static inline uint32_t  //
wuffs_base__load_u24be(uint8_t* p) {
  return ((uint32_t)(p[0]) << 16) | ((uint32_t)(p[1]) << 8) |
         ((uint32_t)(p[2]) << 0);
}

static inline uint32_t  //
wuffs_base__load_u24le(uint8_t* p) {
  return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
         ((uint32_t)(p[2]) << 16);
}

static inline uint32_t  //
wuffs_base__load_u32be(uint8_t* p) {
  return ((uint32_t)(p[0]) << 24) | ((uint32_t)(p[1]) << 16) |
         ((uint32_t)(p[2]) << 8) | ((uint32_t)(p[3]) << 0);
}

static inline uint32_t  //
wuffs_base__load_u32le(uint8_t* p) {
  return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
         ((uint32_t)(p[2]) << 16) | ((uint32_t)(p[3]) << 24);
}

static inline uint64_t  //
wuffs_base__load_u40be(uint8_t* p) {
  return ((uint64_t)(p[0]) << 32) | ((uint64_t)(p[1]) << 24) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 8) |
         ((uint64_t)(p[4]) << 0);
}

static inline uint64_t  //
wuffs_base__load_u40le(uint8_t* p) {
  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 32);
}

static inline uint64_t  //
wuffs_base__load_u48be(uint8_t* p) {
  return ((uint64_t)(p[0]) << 40) | ((uint64_t)(p[1]) << 32) |
         ((uint64_t)(p[2]) << 24) | ((uint64_t)(p[3]) << 16) |
         ((uint64_t)(p[4]) << 8) | ((uint64_t)(p[5]) << 0);
}

static inline uint64_t  //
wuffs_base__load_u48le(uint8_t* p) {
  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40);
}

static inline uint64_t  //
wuffs_base__load_u56be(uint8_t* p) {
  return ((uint64_t)(p[0]) << 48) | ((uint64_t)(p[1]) << 40) |
         ((uint64_t)(p[2]) << 32) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 16) | ((uint64_t)(p[5]) << 8) |
         ((uint64_t)(p[6]) << 0);
}

static inline uint64_t  //
wuffs_base__load_u56le(uint8_t* p) {
  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40) |
         ((uint64_t)(p[6]) << 48);
}

static inline uint64_t  //
wuffs_base__load_u64be(uint8_t* p) {
  return ((uint64_t)(p[0]) << 56) | ((uint64_t)(p[1]) << 48) |
         ((uint64_t)(p[2]) << 40) | ((uint64_t)(p[3]) << 32) |
         ((uint64_t)(p[4]) << 24) | ((uint64_t)(p[5]) << 16) |
         ((uint64_t)(p[6]) << 8) | ((uint64_t)(p[7]) << 0);
}

static inline uint64_t  //
wuffs_base__load_u64le(uint8_t* p) {
  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40) |
         ((uint64_t)(p[6]) << 48) | ((uint64_t)(p[7]) << 56);
}

// --------

static inline void  //
wuffs_base__store_u8be(uint8_t* p, uint8_t x) {
  p[0] = x;
}

static inline void  //
wuffs_base__store_u16be(uint8_t* p, uint16_t x) {
  p[0] = (uint8_t)(x >> 8);
  p[1] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__store_u16le(uint8_t* p, uint16_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
}

static inline void  //
wuffs_base__store_u24be(uint8_t* p, uint32_t x) {
  p[0] = (uint8_t)(x >> 16);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__store_u24le(uint8_t* p, uint32_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
}

static inline void  //
wuffs_base__store_u32be(uint8_t* p, uint32_t x) {
  p[0] = (uint8_t)(x >> 24);
  p[1] = (uint8_t)(x >> 16);
  p[2] = (uint8_t)(x >> 8);
  p[3] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__store_u32le(uint8_t* p, uint32_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
}

static inline void  //
wuffs_base__store_u40be(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 32);
  p[1] = (uint8_t)(x >> 24);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 8);
  p[4] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__store_u40le(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 32);
}

static inline void  //
wuffs_base__store_u48be(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 40);
  p[1] = (uint8_t)(x >> 32);
  p[2] = (uint8_t)(x >> 24);
  p[3] = (uint8_t)(x >> 16);
  p[4] = (uint8_t)(x >> 8);
  p[5] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__store_u48le(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 32);
  p[5] = (uint8_t)(x >> 40);
}

static inline void  //
wuffs_base__store_u56be(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 48);
  p[1] = (uint8_t)(x >> 40);
  p[2] = (uint8_t)(x >> 32);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 16);
  p[5] = (uint8_t)(x >> 8);
  p[6] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__store_u56le(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 32);
  p[5] = (uint8_t)(x >> 40);
  p[6] = (uint8_t)(x >> 48);
}

static inline void  //
wuffs_base__store_u64be(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 56);
  p[1] = (uint8_t)(x >> 48);
  p[2] = (uint8_t)(x >> 40);
  p[3] = (uint8_t)(x >> 32);
  p[4] = (uint8_t)(x >> 24);
  p[5] = (uint8_t)(x >> 16);
  p[6] = (uint8_t)(x >> 8);
  p[7] = (uint8_t)(x >> 0);
}

static inline void  //
wuffs_base__store_u64le(uint8_t* p, uint64_t x) {
  p[0] = (uint8_t)(x >> 0);
  p[1] = (uint8_t)(x >> 8);
  p[2] = (uint8_t)(x >> 16);
  p[3] = (uint8_t)(x >> 24);
  p[4] = (uint8_t)(x >> 32);
  p[5] = (uint8_t)(x >> 40);
  p[6] = (uint8_t)(x >> 48);
  p[7] = (uint8_t)(x >> 56);
}

// --------

extern const uint8_t wuffs_base__low_bits_mask__u8[9];
extern const uint16_t wuffs_base__low_bits_mask__u16[17];
extern const uint32_t wuffs_base__low_bits_mask__u32[33];
extern const uint64_t wuffs_base__low_bits_mask__u64[65];

#define WUFFS_BASE__LOW_BITS_MASK__U8(n) (wuffs_base__low_bits_mask__u8[n])
#define WUFFS_BASE__LOW_BITS_MASK__U16(n) (wuffs_base__low_bits_mask__u16[n])
#define WUFFS_BASE__LOW_BITS_MASK__U32(n) (wuffs_base__low_bits_mask__u32[n])
#define WUFFS_BASE__LOW_BITS_MASK__U64(n) (wuffs_base__low_bits_mask__u64[n])

// --------

static inline void  //
wuffs_base__u8__sat_add_indirect(uint8_t* x, uint8_t y) {
  *x = wuffs_base__u8__sat_add(*x, y);
}

static inline void  //
wuffs_base__u8__sat_sub_indirect(uint8_t* x, uint8_t y) {
  *x = wuffs_base__u8__sat_sub(*x, y);
}

static inline void  //
wuffs_base__u16__sat_add_indirect(uint16_t* x, uint16_t y) {
  *x = wuffs_base__u16__sat_add(*x, y);
}

static inline void  //
wuffs_base__u16__sat_sub_indirect(uint16_t* x, uint16_t y) {
  *x = wuffs_base__u16__sat_sub(*x, y);
}

static inline void  //
wuffs_base__u32__sat_add_indirect(uint32_t* x, uint32_t y) {
  *x = wuffs_base__u32__sat_add(*x, y);
}

static inline void  //
wuffs_base__u32__sat_sub_indirect(uint32_t* x, uint32_t y) {
  *x = wuffs_base__u32__sat_sub(*x, y);
}

static inline void  //
wuffs_base__u64__sat_add_indirect(uint64_t* x, uint64_t y) {
  *x = wuffs_base__u64__sat_add(*x, y);
}

static inline void  //
wuffs_base__u64__sat_sub_indirect(uint64_t* x, uint64_t y) {
  *x = wuffs_base__u64__sat_sub(*x, y);
}

// ---------------- Slices and Tables

// wuffs_base__slice_u8__prefix returns up to the first up_to bytes of s.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__prefix(wuffs_base__slice_u8 s, uint64_t up_to) {
  if ((uint64_t)(s.len) > up_to) {
    s.len = up_to;
  }
  return s;
}

// wuffs_base__slice_u8__suffix returns up to the last up_to bytes of s.
static inline wuffs_base__slice_u8  //
wuffs_base__slice_u8__suffix(wuffs_base__slice_u8 s, uint64_t up_to) {
  if ((uint64_t)(s.len) > up_to) {
    s.ptr += (uint64_t)(s.len) - up_to;
    s.len = up_to;
  }
  return s;
}

// wuffs_base__slice_u8__copy_from_slice calls memmove(dst.ptr, src.ptr, len)
// where len is the minimum of dst.len and src.len.
//
// Passing a wuffs_base__slice_u8 with all fields NULL or zero (a valid, empty
// slice) is valid and results in a no-op.
static inline uint64_t  //
wuffs_base__slice_u8__copy_from_slice(wuffs_base__slice_u8 dst,
                                      wuffs_base__slice_u8 src) {
  size_t len = dst.len < src.len ? dst.len : src.len;
  if (len > 0) {
    memmove(dst.ptr, src.ptr, len);
  }
  return len;
}

// --------

static inline wuffs_base__slice_u8  //
wuffs_base__table_u8__row(wuffs_base__table_u8 t, uint32_t y) {
  if (y < t.height) {
    return wuffs_base__make_slice_u8(t.ptr + (t.stride * y), t.width);
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

  // ---------------- Slices and Tables (Utility)

#define wuffs_base__utility__empty_slice_u8 wuffs_base__empty_slice_u8

// ---------------- Ranges and Rects

static inline uint32_t  //
wuffs_base__range_ii_u32__get_min_incl(const wuffs_base__range_ii_u32* r) {
  return r->min_incl;
}

static inline uint32_t  //
wuffs_base__range_ii_u32__get_max_incl(const wuffs_base__range_ii_u32* r) {
  return r->max_incl;
}

static inline uint32_t  //
wuffs_base__range_ie_u32__get_min_incl(const wuffs_base__range_ie_u32* r) {
  return r->min_incl;
}

static inline uint32_t  //
wuffs_base__range_ie_u32__get_max_excl(const wuffs_base__range_ie_u32* r) {
  return r->max_excl;
}

static inline uint64_t  //
wuffs_base__range_ii_u64__get_min_incl(const wuffs_base__range_ii_u64* r) {
  return r->min_incl;
}

static inline uint64_t  //
wuffs_base__range_ii_u64__get_max_incl(const wuffs_base__range_ii_u64* r) {
  return r->max_incl;
}

static inline uint64_t  //
wuffs_base__range_ie_u64__get_min_incl(const wuffs_base__range_ie_u64* r) {
  return r->min_incl;
}

static inline uint64_t  //
wuffs_base__range_ie_u64__get_max_excl(const wuffs_base__range_ie_u64* r) {
  return r->max_excl;
}

  // ---------------- Ranges and Rects (Utility)

#define wuffs_base__utility__make_range_ii_u32 wuffs_base__make_range_ii_u32
#define wuffs_base__utility__make_range_ie_u32 wuffs_base__make_range_ie_u32
#define wuffs_base__utility__make_range_ii_u64 wuffs_base__make_range_ii_u64
#define wuffs_base__utility__make_range_ie_u64 wuffs_base__make_range_ie_u64
#define wuffs_base__utility__make_rect_ii_u32 wuffs_base__make_rect_ii_u32
#define wuffs_base__utility__make_rect_ie_u32 wuffs_base__make_rect_ie_u32

// ---------------- I/O

static inline uint64_t  //
wuffs_base__io__count_since(uint64_t mark, uint64_t index) {
  if (index >= mark) {
    return index - mark;
  }
  return 0;
}

static inline wuffs_base__slice_u8  //
wuffs_base__io__since(uint64_t mark, uint64_t index, uint8_t* ptr) {
  if (index >= mark) {
    return wuffs_base__make_slice_u8(ptr + mark, index - mark);
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

static inline uint32_t  //
wuffs_base__io_writer__copy_n_from_history(uint8_t** ptr_iop_w,
                                           uint8_t* io1_w,
                                           uint8_t* io2_w,
                                           uint32_t length,
                                           uint32_t distance) {
  if (!distance) {
    return 0;
  }
  uint8_t* p = *ptr_iop_w;
  if ((size_t)(p - io1_w) < (size_t)(distance)) {
    return 0;
  }
  uint8_t* q = p - distance;
  size_t n = (size_t)(io2_w - p);
  if ((size_t)(length) > n) {
    length = (uint32_t)(n);
  } else {
    n = (size_t)(length);
  }
  // TODO: unrolling by 3 seems best for the std/deflate benchmarks, but that
  // is mostly because 3 is the minimum length for the deflate format. This
  // function implementation shouldn't overfit to that one format. Perhaps the
  // copy_n_from_history Wuffs method should also take an unroll hint argument,
  // and the cgen can look if that argument is the constant expression '3'.
  //
  // See also wuffs_base__io_writer__copy_n_from_history_fast below.
  //
  // Alternatively, or additionally, have a sloppy_copy_n_from_history method
  // that copies 8 bytes at a time, possibly writing more than length bytes?
  for (; n >= 3; n -= 3) {
    *p++ = *q++;
    *p++ = *q++;
    *p++ = *q++;
  }
  for (; n; n--) {
    *p++ = *q++;
  }
  *ptr_iop_w = p;
  return length;
}

// wuffs_base__io_writer__copy_n_from_history_fast is like the
// wuffs_base__io_writer__copy_n_from_history function above, but has stronger
// pre-conditions. The caller needs to prove that:
//  - distance >  0
//  - distance <= (*ptr_iop_w - io1_w)
//  - length   <= (io2_w      - *ptr_iop_w)
static inline uint32_t  //
wuffs_base__io_writer__copy_n_from_history_fast(uint8_t** ptr_iop_w,
                                                uint8_t* io1_w,
                                                uint8_t* io2_w,
                                                uint32_t length,
                                                uint32_t distance) {
  uint8_t* p = *ptr_iop_w;
  uint8_t* q = p - distance;
  uint32_t n = length;
  for (; n >= 3; n -= 3) {
    *p++ = *q++;
    *p++ = *q++;
    *p++ = *q++;
  }
  for (; n; n--) {
    *p++ = *q++;
  }
  *ptr_iop_w = p;
  return length;
}

static inline uint32_t  //
wuffs_base__io_writer__copy_n_from_reader(uint8_t** ptr_iop_w,
                                          uint8_t* io2_w,
                                          uint32_t length,
                                          uint8_t** ptr_iop_r,
                                          uint8_t* io2_r) {
  uint8_t* iop_w = *ptr_iop_w;
  size_t n = length;
  if (n > ((size_t)(io2_w - iop_w))) {
    n = (size_t)(io2_w - iop_w);
  }
  uint8_t* iop_r = *ptr_iop_r;
  if (n > ((size_t)(io2_r - iop_r))) {
    n = (size_t)(io2_r - iop_r);
  }
  if (n > 0) {
    memmove(iop_w, iop_r, n);
    *ptr_iop_w += n;
    *ptr_iop_r += n;
  }
  return (uint32_t)(n);
}

static inline uint64_t  //
wuffs_base__io_writer__copy_from_slice(uint8_t** ptr_iop_w,
                                       uint8_t* io2_w,
                                       wuffs_base__slice_u8 src) {
  uint8_t* iop_w = *ptr_iop_w;
  size_t n = src.len;
  if (n > ((size_t)(io2_w - iop_w))) {
    n = (size_t)(io2_w - iop_w);
  }
  if (n > 0) {
    memmove(iop_w, src.ptr, n);
    *ptr_iop_w += n;
  }
  return (uint64_t)(n);
}

static inline uint32_t  //
wuffs_base__io_writer__copy_n_from_slice(uint8_t** ptr_iop_w,
                                         uint8_t* io2_w,
                                         uint32_t length,
                                         wuffs_base__slice_u8 src) {
  uint8_t* iop_w = *ptr_iop_w;
  size_t n = src.len;
  if (n > length) {
    n = length;
  }
  if (n > ((size_t)(io2_w - iop_w))) {
    n = (size_t)(io2_w - iop_w);
  }
  if (n > 0) {
    memmove(iop_w, src.ptr, n);
    *ptr_iop_w += n;
  }
  return (uint32_t)(n);
}

static inline wuffs_base__io_buffer*  //
wuffs_base__io_reader__set(wuffs_base__io_buffer* b,
                           uint8_t** ptr_iop_r,
                           uint8_t** ptr_io0_r,
                           uint8_t** ptr_io1_r,
                           uint8_t** ptr_io2_r,
                           wuffs_base__slice_u8 data) {
  b->data = data;
  b->meta.wi = data.len;
  b->meta.ri = 0;
  b->meta.pos = 0;
  b->meta.closed = false;

  *ptr_iop_r = data.ptr;
  *ptr_io0_r = data.ptr;
  *ptr_io1_r = data.ptr;
  *ptr_io2_r = data.ptr + data.len;

  return b;
}

static inline wuffs_base__slice_u8  //
wuffs_base__io_reader__take(uint8_t** ptr_iop_r, uint8_t* io2_r, uint64_t n) {
  if (n <= ((size_t)(io2_r - *ptr_iop_r))) {
    uint8_t* p = *ptr_iop_r;
    *ptr_iop_r += n;
    return wuffs_base__make_slice_u8(p, n);
  }
  return wuffs_base__make_slice_u8(NULL, 0);
}

static inline wuffs_base__io_buffer*  //
wuffs_base__io_writer__set(wuffs_base__io_buffer* b,
                           uint8_t** ptr_iop_w,
                           uint8_t** ptr_io0_w,
                           uint8_t** ptr_io1_w,
                           uint8_t** ptr_io2_w,
                           wuffs_base__slice_u8 data) {
  b->data = data;
  b->meta.wi = 0;
  b->meta.ri = 0;
  b->meta.pos = 0;
  b->meta.closed = false;

  *ptr_iop_w = data.ptr;
  *ptr_io0_w = data.ptr;
  *ptr_io1_w = data.ptr;
  *ptr_io2_w = data.ptr + data.len;

  return b;
}

  // ---------------- I/O (Utility)

#define wuffs_base__utility__empty_io_reader wuffs_base__empty_io_reader
#define wuffs_base__utility__empty_io_writer wuffs_base__empty_io_writer

  // ---------------- Memory Allocation

  // ---------------- Images

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE)

const uint8_t wuffs_base__low_bits_mask__u8[9] = {
    0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF,
};

const uint16_t wuffs_base__low_bits_mask__u16[17] = {
    0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF,
    0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF,
};

const uint32_t wuffs_base__low_bits_mask__u32[33] = {
    0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000F, 0x0000001F,
    0x0000003F, 0x0000007F, 0x000000FF, 0x000001FF, 0x000003FF, 0x000007FF,
    0x00000FFF, 0x00001FFF, 0x00003FFF, 0x00007FFF, 0x0000FFFF, 0x0001FFFF,
    0x0003FFFF, 0x0007FFFF, 0x000FFFFF, 0x001FFFFF, 0x003FFFFF, 0x007FFFFF,
    0x00FFFFFF, 0x01FFFFFF, 0x03FFFFFF, 0x07FFFFFF, 0x0FFFFFFF, 0x1FFFFFFF,
    0x3FFFFFFF, 0x7FFFFFFF, 0xFFFFFFFF,
};

const uint64_t wuffs_base__low_bits_mask__u64[65] = {
    0x0000000000000000, 0x0000000000000001, 0x0000000000000003,
    0x0000000000000007, 0x000000000000000F, 0x000000000000001F,
    0x000000000000003F, 0x000000000000007F, 0x00000000000000FF,
    0x00000000000001FF, 0x00000000000003FF, 0x00000000000007FF,
    0x0000000000000FFF, 0x0000000000001FFF, 0x0000000000003FFF,
    0x0000000000007FFF, 0x000000000000FFFF, 0x000000000001FFFF,
    0x000000000003FFFF, 0x000000000007FFFF, 0x00000000000FFFFF,
    0x00000000001FFFFF, 0x00000000003FFFFF, 0x00000000007FFFFF,
    0x0000000000FFFFFF, 0x0000000001FFFFFF, 0x0000000003FFFFFF,
    0x0000000007FFFFFF, 0x000000000FFFFFFF, 0x000000001FFFFFFF,
    0x000000003FFFFFFF, 0x000000007FFFFFFF, 0x00000000FFFFFFFF,
    0x00000001FFFFFFFF, 0x00000003FFFFFFFF, 0x00000007FFFFFFFF,
    0x0000000FFFFFFFFF, 0x0000001FFFFFFFFF, 0x0000003FFFFFFFFF,
    0x0000007FFFFFFFFF, 0x000000FFFFFFFFFF, 0x000001FFFFFFFFFF,
    0x000003FFFFFFFFFF, 0x000007FFFFFFFFFF, 0x00000FFFFFFFFFFF,
    0x00001FFFFFFFFFFF, 0x00003FFFFFFFFFFF, 0x00007FFFFFFFFFFF,
    0x0000FFFFFFFFFFFF, 0x0001FFFFFFFFFFFF, 0x0003FFFFFFFFFFFF,
    0x0007FFFFFFFFFFFF, 0x000FFFFFFFFFFFFF, 0x001FFFFFFFFFFFFF,
    0x003FFFFFFFFFFFFF, 0x007FFFFFFFFFFFFF, 0x00FFFFFFFFFFFFFF,
    0x01FFFFFFFFFFFFFF, 0x03FFFFFFFFFFFFFF, 0x07FFFFFFFFFFFFFF,
    0x0FFFFFFFFFFFFFFF, 0x1FFFFFFFFFFFFFFF, 0x3FFFFFFFFFFFFFFF,
    0x7FFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF,
};

const char* wuffs_base__warning__end_of_data = "@base: end of data";
const char* wuffs_base__warning__metadata_reported = "@base: metadata reported";
const char* wuffs_base__suspension__short_read = "$base: short read";
const char* wuffs_base__suspension__short_write = "$base: short write";
const char* wuffs_base__error__bad_i_o_position = "#base: bad I/O position";
const char* wuffs_base__error__bad_argument_length_too_short =
    "#base: bad argument (length too short)";
const char* wuffs_base__error__bad_argument = "#base: bad argument";
const char* wuffs_base__error__bad_call_sequence = "#base: bad call sequence";
const char* wuffs_base__error__bad_receiver = "#base: bad receiver";
const char* wuffs_base__error__bad_restart = "#base: bad restart";
const char* wuffs_base__error__bad_sizeof_receiver =
    "#base: bad sizeof receiver";
const char* wuffs_base__error__bad_workbuf_length = "#base: bad workbuf length";
const char* wuffs_base__error__bad_wuffs_version = "#base: bad wuffs version";
const char* wuffs_base__error__cannot_return_a_suspension =
    "#base: cannot return a suspension";
const char* wuffs_base__error__disabled_by_previous_error =
    "#base: disabled by previous error";
const char* wuffs_base__error__initialize_falsely_claimed_already_zeroed =
    "#base: initialize falsely claimed already zeroed";
const char* wuffs_base__error__initialize_not_called =
    "#base: initialize not called";
const char* wuffs_base__error__interleaved_coroutine_calls =
    "#base: interleaved coroutine calls";
const char* wuffs_base__error__not_enough_data = "#base: not enough data";
const char* wuffs_base__error__unsupported_option = "#base: unsupported option";
const char* wuffs_base__error__too_much_data = "#base: too much data";

// ---------------- Images

const uint32_t wuffs_base__pixel_format__bits_per_channel[16] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    0x08, 0x0A, 0x0C, 0x10, 0x18, 0x20, 0x30, 0x40,
};

static uint64_t  //
wuffs_base__pixel_swizzler__copy_1_1(wuffs_base__slice_u8 dst,
                                     wuffs_base__slice_u8 dst_palette,
                                     wuffs_base__slice_u8 src) {
  return wuffs_base__slice_u8__copy_from_slice(dst, src);
}

static uint64_t  //
wuffs_base__pixel_swizzler__copy_3_1(wuffs_base__slice_u8 dst,
                                     wuffs_base__slice_u8 dst_palette,
                                     wuffs_base__slice_u8 src) {
  if (dst_palette.len != 1024) {
    return 0;
  }
  size_t dst_len3 = dst.len / 3;
  size_t len = dst_len3 < src.len ? dst_len3 : src.len;
  uint8_t* d = dst.ptr;
  uint8_t* s = src.ptr;
  size_t n = len;

  // N is the loop unroll count.
  const int N = 4;

  // The comparison in the while condition is ">", not ">=", because with ">=",
  // the last 4-byte store could write past the end of the dst slice.
  //
  // Each 4-byte store writes one too many bytes, but a subsequent store will
  // overwrite that with the correct byte. There is always another store,
  // whether a 4-byte store in this loop or a 1-byte store in the next loop.
  while (n > N) {
    wuffs_base__store_u32le(
        d + (0 * 3),
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4)));
    wuffs_base__store_u32le(
        d + (1 * 3),
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[1]) * 4)));
    wuffs_base__store_u32le(
        d + (2 * 3),
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[2]) * 4)));
    wuffs_base__store_u32le(
        d + (3 * 3),
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[3]) * 4)));

    s += 1 * N;
    d += 3 * N;
    n -= (size_t)(1 * N);
  }

  while (n >= 1) {
    uint32_t color =
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4));
    d[0] = (uint8_t)(color >> 0);
    d[1] = (uint8_t)(color >> 8);
    d[2] = (uint8_t)(color >> 16);

    s += 1 * 1;
    d += 3 * 1;
    n -= (size_t)(1 * 1);
  }

  return len;
}
static uint64_t  //
wuffs_base__pixel_swizzler__copy_4_1(wuffs_base__slice_u8 dst,
                                     wuffs_base__slice_u8 dst_palette,
                                     wuffs_base__slice_u8 src) {
  if (dst_palette.len != 1024) {
    return 0;
  }
  size_t dst_len4 = dst.len / 4;
  size_t len = dst_len4 < src.len ? dst_len4 : src.len;
  uint8_t* d = dst.ptr;
  uint8_t* s = src.ptr;
  size_t n = len;

  // N is the loop unroll count.
  const int N = 4;

  while (n >= N) {
    wuffs_base__store_u32le(
        d + (0 * 4),
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4)));
    wuffs_base__store_u32le(
        d + (1 * 4),
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[1]) * 4)));
    wuffs_base__store_u32le(
        d + (2 * 4),
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[2]) * 4)));
    wuffs_base__store_u32le(
        d + (3 * 4),
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[3]) * 4)));

    s += 1 * N;
    d += 4 * N;
    n -= (size_t)(1 * N);
  }

  while (n >= 1) {
    wuffs_base__store_u32le(
        d + (0 * 4),
        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4)));

    s += 1 * 1;
    d += 4 * 1;
    n -= (size_t)(1 * 1);
  }

  return len;
}

static uint64_t  //
wuffs_base__pixel_swizzler__swap_rgbx_bgrx(wuffs_base__slice_u8 dst,
                                           wuffs_base__slice_u8 src) {
  size_t len4 = (dst.len < src.len ? dst.len : src.len) / 4;
  uint8_t* d = dst.ptr;
  uint8_t* s = src.ptr;

  size_t n = len4;
  while (n--) {
    uint8_t b0 = s[0];
    uint8_t b1 = s[1];
    uint8_t b2 = s[2];
    uint8_t b3 = s[3];
    d[0] = b2;
    d[1] = b1;
    d[2] = b0;
    d[3] = b3;
    s += 4;
    d += 4;
  }
  return len4 * 4;
}

wuffs_base__status  //
wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
                                    wuffs_base__pixel_format dst_format,
                                    wuffs_base__slice_u8 dst_palette,
                                    wuffs_base__pixel_format src_format,
                                    wuffs_base__slice_u8 src_palette) {
  if (!p) {
    return wuffs_base__error__bad_receiver;
  }

  // TODO: support many more formats.

  uint64_t (*func)(wuffs_base__slice_u8 dst, wuffs_base__slice_u8 dst_palette,
                   wuffs_base__slice_u8 src) = NULL;

  switch (src_format) {
    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
      switch (dst_format) {
        case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
        case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
        case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
              1024) {
            break;
          }
          func = wuffs_base__pixel_swizzler__copy_1_1;
          break;
        case WUFFS_BASE__PIXEL_FORMAT__BGR:
          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
              1024) {
            break;
          }
          func = wuffs_base__pixel_swizzler__copy_3_1;
          break;
        case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
        case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
        case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
              1024) {
            break;
          }
          func = wuffs_base__pixel_swizzler__copy_4_1;
          break;
        case WUFFS_BASE__PIXEL_FORMAT__RGB:
          if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(dst_palette,
                                                         src_palette) != 1024) {
            break;
          }
          func = wuffs_base__pixel_swizzler__copy_3_1;
          break;
        case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
        case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
        case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
          if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(dst_palette,
                                                         src_palette) != 1024) {
            break;
          }
          func = wuffs_base__pixel_swizzler__copy_4_1;
          break;
        default:
          break;
      }
      break;

    default:
      break;
  }

  p->private_impl.func = func;
  return func ? NULL : wuffs_base__error__unsupported_option;
}

uint64_t  //
wuffs_base__pixel_swizzler__swizzle_interleaved(
    const wuffs_base__pixel_swizzler* p,
    wuffs_base__slice_u8 dst,
    wuffs_base__slice_u8 dst_palette,
    wuffs_base__slice_u8 src) {
  if (p && p->private_impl.func) {
    return (*(p->private_impl.func))(dst, dst_palette, src);
  }
  return 0;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__BASE)

#ifdef __cplusplus
}  // extern "C"
#endif

#ifdef __clang__
#pragma clang diagnostic pop
#endif

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ADLER32)

// ---------------- Status Codes Implementations

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_adler32__hasher__initialize(wuffs_adler32__hasher* self,
                                  size_t sizeof_star_self,
                                  uint64_t wuffs_version,
                                  uint32_t initialize_flags) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__error__bad_sizeof_receiver;
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__error__bad_wuffs_version;
  }

  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
// The whole point of this if-check is to detect an uninitialized *self.
// We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  return NULL;
}

size_t  //
sizeof__wuffs_adler32__hasher() {
  return sizeof(wuffs_adler32__hasher);
}

// ---------------- Function Implementations

// -------- func adler32.hasher.update_u32

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_adler32__hasher__update_u32(wuffs_adler32__hasher* self,
                                  wuffs_base__slice_u8 a_x) {
  if (!self) {
    return 0;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return 0;
  }

  uint32_t v_s1 = 0;
  uint32_t v_s2 = 0;
  wuffs_base__slice_u8 v_remaining = {0};
  wuffs_base__slice_u8 v_p = {0};

  if (!self->private_impl.f_started) {
    self->private_impl.f_started = true;
    self->private_impl.f_state = 1;
  }
  v_s1 = ((self->private_impl.f_state) & 0xFFFF);
  v_s2 = ((self->private_impl.f_state) >> (32 - (16)));
  while (((uint64_t)(a_x.len)) > 0) {
    v_remaining = wuffs_base__slice_u8__subslice_j(a_x, 0);
    if (((uint64_t)(a_x.len)) > 5552) {
      v_remaining = wuffs_base__slice_u8__subslice_i(a_x, 5552);
      a_x = wuffs_base__slice_u8__subslice_j(a_x, 5552);
    }
    {
      wuffs_base__slice_u8 i_slice_p = a_x;
      v_p = i_slice_p;
      v_p.len = 1;
      uint8_t* i_end0_p = i_slice_p.ptr + (i_slice_p.len / 8) * 8;
      while (v_p.ptr < i_end0_p) {
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
      }
      v_p.len = 1;
      uint8_t* i_end1_p = i_slice_p.ptr + (i_slice_p.len / 1) * 1;
      while (v_p.ptr < i_end1_p) {
        v_s1 += ((uint32_t)(v_p.ptr[0]));
        v_s2 += v_s1;
        v_p.ptr += 1;
      }
    }
    v_s1 %= 65521;
    v_s2 %= 65521;
    a_x = v_remaining;
  }
  self->private_impl.f_state = (((v_s2 & 65535) << 16) | (v_s1 & 65535));
  return self->private_impl.f_state;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__ADLER32)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CRC32)

// ---------------- Status Codes Implementations

// ---------------- Private Consts

static const uint32_t                 //
    wuffs_crc32__ieee_table[16][256]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        {
            0,          1996959894, 3993919788, 2567524794, 124634137,
            1886057615, 3915621685, 2657392035, 249268274,  2044508324,
            3772115230, 2547177864, 162941995,  2125561021, 3887607047,
            2428444049, 498536548,  1789927666, 4089016648, 2227061214,
            450548861,  1843258603, 4107580753, 2211677639, 325883990,
            1684777152, 4251122042, 2321926636, 335633487,  1661365465,
            4195302755, 2366115317, 997073096,  1281953886, 3579855332,
            2724688242, 1006888145, 1258607687, 3524101629, 2768942443,
            901097722,  1119000684, 3686517206, 2898065728, 853044451,
            1172266101, 3705015759, 2882616665, 651767980,  1373503546,
            3369554304, 3218104598, 565507253,  1454621731, 3485111705,
            3099436303, 671266974,  1594198024, 3322730930, 2970347812,
            795835527,  1483230225, 3244367275, 3060149565, 1994146192,
            31158534,   2563907772, 4023717930, 1907459465, 112637215,
            2680153253, 3904427059, 2013776290, 251722036,  2517215374,
            3775830040, 2137656763, 141376813,  2439277719, 3865271297,
            1802195444, 476864866,  2238001368, 4066508878, 1812370925,
            453092731,  2181625025, 4111451223, 1706088902, 314042704,
            2344532202, 4240017532, 1658658271, 366619977,  2362670323,
            4224994405, 1303535960, 984961486,  2747007092, 3569037538,
            1256170817, 1037604311, 2765210733, 3554079995, 1131014506,
            879679996,  2909243462, 3663771856, 1141124467, 855842277,
            2852801631, 3708648649, 1342533948, 654459306,  3188396048,
            3373015174, 1466479909, 544179635,  3110523913, 3462522015,
            1591671054, 702138776,  2966460450, 3352799412, 1504918807,
            783551873,  3082640443, 3233442989, 3988292384, 2596254646,
            62317068,   1957810842, 3939845945, 2647816111, 81470997,
            1943803523, 3814918930, 2489596804, 225274430,  2053790376,
            3826175755, 2466906013, 167816743,  2097651377, 4027552580,
            2265490386, 503444072,  1762050814, 4150417245, 2154129355,
            426522225,  1852507879, 4275313526, 2312317920, 282753626,
            1742555852, 4189708143, 2394877945, 397917763,  1622183637,
            3604390888, 2714866558, 953729732,  1340076626, 3518719985,
            2797360999, 1068828381, 1219638859, 3624741850, 2936675148,
            906185462,  1090812512, 3747672003, 2825379669, 829329135,
            1181335161, 3412177804, 3160834842, 628085408,  1382605366,
            3423369109, 3138078467, 570562233,  1426400815, 3317316542,
            2998733608, 733239954,  1555261956, 3268935591, 3050360625,
            752459403,  1541320221, 2607071920, 3965973030, 1969922972,
            40735498,   2617837225, 3943577151, 1913087877, 83908371,
            2512341634, 3803740692, 2075208622, 213261112,  2463272603,
            3855990285, 2094854071, 198958881,  2262029012, 4057260610,
            1759359992, 534414190,  2176718541, 4139329115, 1873836001,
            414664567,  2282248934, 4279200368, 1711684554, 285281116,
            2405801727, 4167216745, 1634467795, 376229701,  2685067896,
            3608007406, 1308918612, 956543938,  2808555105, 3495958263,
            1231636301, 1047427035, 2932959818, 3654703836, 1088359270,
            936918000,  2847714899, 3736837829, 1202900863, 817233897,
            3183342108, 3401237130, 1404277552, 615818150,  3134207493,
            3453421203, 1423857449, 601450431,  3009837614, 3294710456,
            1567103746, 711928724,  3020668471, 3272380065, 1510334235,
            755167117,
        },
        {
            0,          421212481,  842424962,  724390851,  1684849924,
            2105013317, 1448781702, 1329698503, 3369699848, 3519200073,
            4210026634, 3824474571, 2897563404, 3048111693, 2659397006,
            2274893007, 1254232657, 1406739216, 2029285587, 1643069842,
            783210325,  934667796,  479770071,  92505238,   2182846553,
            2600511768, 2955803355, 2838940570, 3866582365, 4285295644,
            3561045983, 3445231262, 2508465314, 2359236067, 2813478432,
            3198777185, 4058571174, 3908292839, 3286139684, 3670389349,
            1566420650, 1145479147, 1869335592, 1987116393, 959540142,
            539646703,  185010476,  303839341,  3745920755, 3327985586,
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            2812847624, 1007544935, 1318679830, 3577493881, 2728586121,
            956803046,  1302285929, 3594125830, 2711933174, 973184153,
            1150152212, 3743982203, 2830528651, 856898788,  1200346475,
            3694041348, 2880457716, 806684571,  1115789546, 3643069573,
            2931426933, 891243034,  1099408277, 3659722746, 2914794762,
            907637093,
        },
        {
            0,          3717650821, 1616688459, 3184159950, 3233376918,
            489665299,  2699419613, 2104690264, 1510200173, 2274691816,
            979330598,  3888758691, 2595928571, 1194090622, 4209380528,
            661706037,  3020400346, 1771143007, 3562738577, 164481556,
            1958661196, 2837976521, 350386439,  3379863682, 3993269687,
            865250354,  2388181244, 1406015865, 784146209,  4079732388,
            1323412074, 2474079215, 3011398645, 1860735600, 3542286014,
            246687547,  1942430051, 2924607718, 328963112,  3456978349,
            3917322392, 887832861,  2300653011, 1421341782, 700772878,
            4099025803, 1234716485, 2483986112, 125431087,  3673109674,
            1730500708, 3132326369, 3351283641, 441867836,  2812031730,
            2047535991, 1568292418, 2163009479, 1025936137, 3769651852,
            2646824148, 1079348561, 4255113631, 537475098,  3180171691,
            1612400686, 3721471200, 4717925,    2100624189, 2694980280,
            493375094,  3237910515, 3884860102, 974691139,  2278750093,
            1514417672, 657926224,  4204917205, 1198234907, 2600289438,
            160053105,  3558665972, 1775665722, 3024116671, 3375586791,
            346391650,  2842683564, 1962488105, 1401545756, 2384412057,
            869618007,  3997403346, 2469432970, 1319524111, 4083956673,
            788193860,  250862174,  3546612699, 1856990997, 3006903952,
            3461001416, 333211981,  2920678787, 1937824774, 1425017139,
            2305216694, 883735672,  3912918525, 2487837605, 1239398944,
            4095071982, 696455019,  3136584836, 1734518017, 3668494799,
            121507914,  2051872274, 2816200599, 437363545,  3347544796,
            3774328809, 1029797484, 2158697122, 1564328743, 542033279,
            4258798842, 1074950196, 2642717105, 2691310871, 2113731730,
            3224801372, 497043929,  1624461185, 3175454212, 9435850,
            3709412175, 4201248378, 671035391,  2587181873, 1201904308,
            986750188,  3880142185, 1519135143, 2266689570, 342721485,
            3388693064, 1949382278, 2846355203, 3570723163, 155332830,
            3028835344, 1763607957, 1315852448, 2482538789, 775087595,
            4087626862, 2396469814, 1396827059, 4002123645, 857560824,
            320106210,  3464673127, 1934154665, 2933785132, 3551331444,
            238804465,  3018961215, 1852270778, 1226292623, 2491507722,
            692783300,  4108177729, 2309936921, 1412959900, 3924976210,
            879016919,  2803091512, 2055541181, 3343875443, 450471158,
            1739236014, 3124525867, 133568485,  3663777376, 4245691221,
            545702608,  2639048222, 1088059291, 1034514883, 3762268230,
            1576387720, 2153979149, 501724348,  3228659001, 2109407735,
            2687359090, 3713981994, 13109167,   3171052385, 1620357860,
            1206151121, 2591211092, 666423962,  4197321503, 2271022407,
            1523307714, 3875649548, 982999433,  2850034278, 1953942499,
            3384583981, 338329256,  1767471344, 3033506165, 151375291,
            3566408766, 4091789579, 779425934,  2478797888, 1311354309,
            861580189,  4006375960, 1392910038, 2391852883, 2929327945,
            1930372812, 3469036034, 324244359,  1847629279, 3015068762,
            243015828,  3555391761, 4103744548, 688715169,  2496043375,
            1229996266, 874727090,  3920994103, 1417671673, 2313759356,
            446585235,  3339223062, 2059594968, 2807313757, 3660002053,
            129100416,  3128657486, 1743609803, 1084066558, 2634765179,
            549535669,  4250396208, 2149900392, 1571961325, 3765982499,
            1039043750,
        },
        {
            0,          2635063670, 3782132909, 2086741467, 430739227,
            2225303149, 4173482934, 1707977408, 861478454,  2924937024,
            3526875803, 1329085421, 720736557,  3086643291, 3415954816,
            1452586230, 1722956908, 4223524122, 2279405761, 450042295,
            2132718455, 3792785921, 2658170842, 58693292,   1441473114,
            3370435372, 3028674295, 696911745,  1279765825, 3511176247,
            2905172460, 807831706,  3445913816, 1349228974, 738901109,
            2969918723, 3569940419, 1237784245, 900084590,  2829701656,
            4265436910, 1664255896, 525574723,  2187084597, 3885099509,
            2057177219, 117386584,  2616249390, 2882946228, 920233410,
            1253605401, 3619119471, 2994391983, 796207833,  1393823490,
            3457937012, 2559531650, 92322804,   2044829231, 3840835417,
            2166609305, 472659183,  1615663412, 4249022530, 1102706673,
            3702920839, 2698457948, 1037619754, 1477802218, 3306854812,
            3111894087, 611605809,  1927342535, 4025419953, 2475568490,
            243387420,  1800169180, 4131620778, 2317525617, 388842247,
            655084445,  3120835307, 3328511792, 1533734470, 1051149446,
            2745738736, 3754524715, 1120297309, 340972971,  2304586973,
            4114354438, 1748234352, 234773168,  2431761350, 3968900637,
            1906278251, 2363330345, 299003487,  1840466820, 4038896370,
            2507210802, 142532932,  1948239007, 3910149609, 3213136159,
            579563625,  1592415666, 3286611140, 2787646980, 992477042,
            1195825833, 3662232543, 3933188933, 2002801203, 184645608,
            2517538462, 4089658462, 1858919720, 313391347,  2409765253,
            3644239219, 1144605701, 945318366,  2773977256, 3231326824,
            1570095902, 569697989,  3170568115, 2205413346, 511446676,
            1646078799, 4279421497, 2598330617, 131105167,  2075239508,
            3871229218, 2955604436, 757403810,  1363424633, 3427521551,
            2844163791, 881434553,  1223211618, 3588709140, 3854685070,
            2026779384, 78583587,   2577462869, 4235025557, 1633861091,
            486774840,  2148301134, 3600338360, 1268198606, 938871061,
            2868504675, 3476308643, 1379640277, 777684494,  3008718712,
            1310168890, 3541595724, 2943964055, 846639841,  1471879201,
            3400857943, 3067468940, 735723002,  2102298892, 3762382970,
            2619362721, 19901655,   1692534295, 4193118049, 2240594618,
            411247564,  681945942,  3047836192, 3385552891, 1422167693,
            822682701,  2886124859, 3496468704, 1298661782, 469546336,
            2264093718, 4203901389, 1738379451, 38812283,   2673859341,
            3812556502, 2117148576, 3268024339, 1606809957, 598006974,
            3198893512, 3680933640, 1181316734, 973624229,  2802299603,
            4052944421, 1822222163, 285065864,  2381456382, 3896478014,
            1966106696, 156323219,  2489232613, 2759337087, 964150537,
            1159127250, 3625517476, 3184831332, 551242258,  1555722185,
            3249901247, 2535537225, 170842943,  1984954084, 3946848146,
            2391651666, 327308324,  1877176831, 4075589769, 263086283,
            2460058045, 4005602406, 1942963472, 369291216,  2332888742,
            4151061373, 1784924683, 1022852861, 2717425547, 3717839440,
            1083595558, 626782694,  3092517008, 3291821387, 1497027645,
            1763466407, 4094934481, 2289211402, 360544636,  1890636732,
            3988730570, 2447251217, 215086695,  1514488465, 3343557607,
            3140191804, 639919946,  1139395978, 3739626748, 2726758695,
            1065936977,
        },
        {
            0,          3120290792, 2827399569, 293431929,  2323408227,
            864534155,  586863858,  2600537882, 3481914503, 1987188591,
            1729068310, 3740575486, 1173727716, 4228805132, 3983743093,
            1418249117, 1147313999, 4254680231, 3974377182, 1428157750,
            3458136620, 2011505092, 1721256893, 3747844181, 2347455432,
            839944224,  594403929,  2593536433, 26687147,   3094146371,
            2836498234, 283794642,  2294627998, 826205558,  541298447,
            2578994407, 45702141,   3141697557, 2856315500, 331624836,
            1196225049, 4273416689, 4023010184, 1446090848, 3442513786,
            1959480466, 1706436331, 3696098563, 3433538001, 1968994873,
            1679888448, 3722103720, 1188807858, 4280295258, 3999102243,
            1470541515, 53374294,   3134568126, 2879970503, 307431215,
            2303854645, 816436189,  567589284,  2553242188, 3405478781,
            1929420949, 1652411116, 3682996484, 1082596894, 4185703926,
            3892424591, 1375368295, 91404282,   3163122706, 2918450795,
            336584067,  2400113305, 922028401,  663249672,  2658384096,
            2392450098, 929185754,  639587747,  2682555979, 82149713,
            3172883129, 2892181696, 362343208,  1091578037, 4176212829,
            3918960932, 1349337804, 3412872662, 1922537022, 1676344391,
            3658557359, 1111377379, 4224032267, 3937989746, 1396912026,
            3359776896, 1908013928, 1623494929, 3644803833, 2377615716,
            877417100,  623982837,  2630542109, 130804743,  3190831087,
            2941083030, 381060734,  106748588,  3215393092, 2933549885,
            388083925,  2350956495, 903570471,  614862430,  2640172470,
            3386185259, 1882115523, 1632872378, 3634920530, 1135178568,
            4199721120, 3945775833, 1389631793, 1317531835, 4152109907,
            3858841898, 1610259138, 3304822232, 2097172016, 1820140617,
            3582394273, 2165193788, 955639764,  696815021,  2423477829,
            192043359,  2995356343, 2750736590, 437203750,  182808564,
            3005133852, 2724453989, 462947725,  2157513367, 962777471,
            673168134,  2447663342, 3312231283, 2090301595, 1844056802,
            3557935370, 1326499344, 4142603768, 3885397889, 1584245865,
            3326266917, 2142836173, 1858371508, 3611272284, 1279175494,
            4123357358, 3837270743, 1564721471, 164299426,  2955991370,
            2706223923, 414607579,  2209834945, 978107433,  724686416,
            2462715320, 2183156074, 1004243586, 715579643,  2472360723,
            140260361,  2980573153, 2698675608, 421617264,  1302961645,
            4099032581, 3845074044, 1557460884, 3352688782, 2116952934,
            1867729183, 3601371895, 2222754758, 1032278062, 754596439,
            2499928511, 234942117,  3086693709, 2793824052, 528319708,
            1274365761, 4061043881, 3816027856, 1518873912, 3246989858,
            2020800970, 1762628531, 3505670235, 3223196809, 2045103969,
            1754834200, 3512958704, 1247965674, 4086934018, 3806642299,
            1528765331, 261609486,  3060532198, 2802936223, 518697591,
            2246819181, 1007707781, 762121468,  2492913428, 213497176,
            3041029808, 2755593417, 499441441,  2261110843, 1061030867,
            776167850,  2545465922, 3274734047, 2060165687, 1807140942,
            3528266662, 1229724860, 4038575956, 3788156205, 1479636677,
            1222322711, 4045468159, 3764231046, 1504067694, 3265744756,
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            802445057,  2519698665, 221152243,  3033880603, 2779263586,
            475261322,
        },
        {
            0,          2926088593, 2275419491, 701019378,  3560000647,
            2052709654, 1402038756, 4261017717, 1930665807, 3715829470,
            4105419308, 1524313021, 2804077512, 155861593,  545453739,
            2397726522, 3861331614, 1213181711, 1636244477, 3488582252,
            840331801,  2625561480, 3048626042, 467584747,  2503254481,
            995897408,  311723186,  3170637091, 1090907478, 4016929991,
            3332753461, 1758288292, 390036349,  3109546732, 2426363422,
            1056427919, 3272488954, 1835443819, 1152258713, 3938878216,
            1680663602, 3393484195, 3817652561, 1306808512, 2954733749,
            510998820,  935169494,  2580880455, 4044899811, 1601229938,
            1991794816, 3637571857, 623446372,  2336332021, 2726898695,
            216120726,  2181814956, 744704829,  95158223,   2881711710,
            1446680107, 4166125498, 3516576584, 2146575065, 780072698,
            2148951915, 2849952665, 129384968,  4199529085, 1411853292,
            2112855838, 3548843663, 1567451573, 4077254692, 3670887638,
            1957027143, 2304517426, 657765539,  251396177,  2694091200,
            3361327204, 1714510325, 1341779207, 3784408214, 476611811,
            2986349938, 2613617024, 899690513,  3142211371, 354600634,
            1021997640, 2458051545, 1870338988, 3239283261, 3906682575,
            1186180958, 960597383,  2536053782, 3202459876, 277428597,
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            3829039961, 3455203243, 1671079482, 2657312335, 806080478,
            432241452,  3081497277, 3748049689, 1896751752, 1489409658,
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            3680356503, 1966430470, 2295112051, 648294626,  258769936,
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            3307794867, 2917509143, 59586950,   709201268,  2217549029,
            2043995280, 3619452161, 4269064691, 1344032866, 3740677976,
            1889445577, 1498812987, 4148069290, 180845535,  2762992206,
            2372361916, 588238637,  1921194766, 3706423967, 4112727661,
            1531686908, 2796705673, 148555288,  554857194,  2407195515,
            26248257,   2952271312, 2251333922, 676868275,  3584149702,
            2076793175, 1375858085, 4234771508, 2493785488, 986493953,
            319029491,  3178008930, 1083533591, 4009621638, 3342158964,
            1767759333, 3887577823, 1239362382, 1612160956, 3464433197,
            864482904,  2649647049, 3022443323, 441336490,  1706844275,
            3419730402, 3793503504, 1282724993, 2978819316, 535149925,
            908921239,  2554697734, 380632892,  3100077741, 2433735263,
            1063734222, 3265180603, 1828069930, 1161729752, 3948283721,
            2207997677, 770953084,  71007118,   2857626143, 1470763626,
            4190274555, 3490330377, 2120394392, 4035494306, 1591758899,
            1999168705, 3644880208, 616140069,  2328960180, 2736367686,
            225524183,
        },
};

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_crc32__ieee_hasher__initialize(wuffs_crc32__ieee_hasher* self,
                                     size_t sizeof_star_self,
                                     uint64_t wuffs_version,
                                     uint32_t initialize_flags) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__error__bad_sizeof_receiver;
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__error__bad_wuffs_version;
  }

  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
// The whole point of this if-check is to detect an uninitialized *self.
// We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  return NULL;
}

size_t  //
sizeof__wuffs_crc32__ieee_hasher() {
  return sizeof(wuffs_crc32__ieee_hasher);
}

// ---------------- Function Implementations

// -------- func crc32.ieee_hasher.update_u32

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_crc32__ieee_hasher__update_u32(wuffs_crc32__ieee_hasher* self,
                                     wuffs_base__slice_u8 a_x) {
  if (!self) {
    return 0;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return 0;
  }

  uint32_t v_s = 0;
  wuffs_base__slice_u8 v_p = {0};

  v_s = (4294967295 ^ self->private_impl.f_state);
  {
    wuffs_base__slice_u8 i_slice_p = a_x;
    v_p = i_slice_p;
    v_p.len = 16;
    uint8_t* i_end0_p = i_slice_p.ptr + (i_slice_p.len / 32) * 32;
    while (v_p.ptr < i_end0_p) {
      v_s ^=
          ((((uint32_t)(v_p.ptr[0])) << 0) | (((uint32_t)(v_p.ptr[1])) << 8) |
           (((uint32_t)(v_p.ptr[2])) << 16) | (((uint32_t)(v_p.ptr[3])) << 24));
      v_s = (wuffs_crc32__ieee_table[0][v_p.ptr[15]] ^
             wuffs_crc32__ieee_table[1][v_p.ptr[14]] ^
             wuffs_crc32__ieee_table[2][v_p.ptr[13]] ^
             wuffs_crc32__ieee_table[3][v_p.ptr[12]] ^
             wuffs_crc32__ieee_table[4][v_p.ptr[11]] ^
             wuffs_crc32__ieee_table[5][v_p.ptr[10]] ^
             wuffs_crc32__ieee_table[6][v_p.ptr[9]] ^
             wuffs_crc32__ieee_table[7][v_p.ptr[8]] ^
             wuffs_crc32__ieee_table[8][v_p.ptr[7]] ^
             wuffs_crc32__ieee_table[9][v_p.ptr[6]] ^
             wuffs_crc32__ieee_table[10][v_p.ptr[5]] ^
             wuffs_crc32__ieee_table[11][v_p.ptr[4]] ^
             wuffs_crc32__ieee_table[12][(255 & (v_s >> 24))] ^
             wuffs_crc32__ieee_table[13][(255 & (v_s >> 16))] ^
             wuffs_crc32__ieee_table[14][(255 & (v_s >> 8))] ^
             wuffs_crc32__ieee_table[15][(255 & (v_s >> 0))]);
      v_p.ptr += 16;
      v_s ^=
          ((((uint32_t)(v_p.ptr[0])) << 0) | (((uint32_t)(v_p.ptr[1])) << 8) |
           (((uint32_t)(v_p.ptr[2])) << 16) | (((uint32_t)(v_p.ptr[3])) << 24));
      v_s = (wuffs_crc32__ieee_table[0][v_p.ptr[15]] ^
             wuffs_crc32__ieee_table[1][v_p.ptr[14]] ^
             wuffs_crc32__ieee_table[2][v_p.ptr[13]] ^
             wuffs_crc32__ieee_table[3][v_p.ptr[12]] ^
             wuffs_crc32__ieee_table[4][v_p.ptr[11]] ^
             wuffs_crc32__ieee_table[5][v_p.ptr[10]] ^
             wuffs_crc32__ieee_table[6][v_p.ptr[9]] ^
             wuffs_crc32__ieee_table[7][v_p.ptr[8]] ^
             wuffs_crc32__ieee_table[8][v_p.ptr[7]] ^
             wuffs_crc32__ieee_table[9][v_p.ptr[6]] ^
             wuffs_crc32__ieee_table[10][v_p.ptr[5]] ^
             wuffs_crc32__ieee_table[11][v_p.ptr[4]] ^
             wuffs_crc32__ieee_table[12][(255 & (v_s >> 24))] ^
             wuffs_crc32__ieee_table[13][(255 & (v_s >> 16))] ^
             wuffs_crc32__ieee_table[14][(255 & (v_s >> 8))] ^
             wuffs_crc32__ieee_table[15][(255 & (v_s >> 0))]);
      v_p.ptr += 16;
    }
    v_p.len = 16;
    uint8_t* i_end1_p = i_slice_p.ptr + (i_slice_p.len / 16) * 16;
    while (v_p.ptr < i_end1_p) {
      v_s ^=
          ((((uint32_t)(v_p.ptr[0])) << 0) | (((uint32_t)(v_p.ptr[1])) << 8) |
           (((uint32_t)(v_p.ptr[2])) << 16) | (((uint32_t)(v_p.ptr[3])) << 24));
      v_s = (wuffs_crc32__ieee_table[0][v_p.ptr[15]] ^
             wuffs_crc32__ieee_table[1][v_p.ptr[14]] ^
             wuffs_crc32__ieee_table[2][v_p.ptr[13]] ^
             wuffs_crc32__ieee_table[3][v_p.ptr[12]] ^
             wuffs_crc32__ieee_table[4][v_p.ptr[11]] ^
             wuffs_crc32__ieee_table[5][v_p.ptr[10]] ^
             wuffs_crc32__ieee_table[6][v_p.ptr[9]] ^
             wuffs_crc32__ieee_table[7][v_p.ptr[8]] ^
             wuffs_crc32__ieee_table[8][v_p.ptr[7]] ^
             wuffs_crc32__ieee_table[9][v_p.ptr[6]] ^
             wuffs_crc32__ieee_table[10][v_p.ptr[5]] ^
             wuffs_crc32__ieee_table[11][v_p.ptr[4]] ^
             wuffs_crc32__ieee_table[12][(255 & (v_s >> 24))] ^
             wuffs_crc32__ieee_table[13][(255 & (v_s >> 16))] ^
             wuffs_crc32__ieee_table[14][(255 & (v_s >> 8))] ^
             wuffs_crc32__ieee_table[15][(255 & (v_s >> 0))]);
      v_p.ptr += 16;
    }
    v_p.len = 1;
    uint8_t* i_end2_p = i_slice_p.ptr + (i_slice_p.len / 1) * 1;
    while (v_p.ptr < i_end2_p) {
      v_s =
          (wuffs_crc32__ieee_table[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^
           (v_s >> 8));
      v_p.ptr += 1;
    }
  }
  self->private_impl.f_state = (4294967295 ^ v_s);
  return self->private_impl.f_state;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__CRC32)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__DEFLATE)

// ---------------- Status Codes Implementations

const char* wuffs_deflate__error__bad_huffman_code_over_subscribed =
    "#deflate: bad Huffman code (over-subscribed)";
const char* wuffs_deflate__error__bad_huffman_code_under_subscribed =
    "#deflate: bad Huffman code (under-subscribed)";
const char* wuffs_deflate__error__bad_huffman_code_length_count =
    "#deflate: bad Huffman code length count";
const char* wuffs_deflate__error__bad_huffman_code_length_repetition =
    "#deflate: bad Huffman code length repetition";
const char* wuffs_deflate__error__bad_huffman_code =
    "#deflate: bad Huffman code";
const char* wuffs_deflate__error__bad_huffman_minimum_code_length =
    "#deflate: bad Huffman minimum code length";
const char* wuffs_deflate__error__bad_block = "#deflate: bad block";
const char* wuffs_deflate__error__bad_distance = "#deflate: bad distance";
const char* wuffs_deflate__error__bad_distance_code_count =
    "#deflate: bad distance code count";
const char* wuffs_deflate__error__bad_literal_length_code_count =
    "#deflate: bad literal/length code count";
const char* wuffs_deflate__error__inconsistent_stored_block_length =
    "#deflate: inconsistent stored block length";
const char* wuffs_deflate__error__missing_end_of_block_code =
    "#deflate: missing end-of-block code";
const char* wuffs_deflate__error__no_huffman_codes =
    "#deflate: no Huffman codes";
const char*
    wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state =
        "#deflate: internal error: inconsistent Huffman decoder state";
const char* wuffs_deflate__error__internal_error_inconsistent_i_o =
    "#deflate: internal error: inconsistent I/O";
const char* wuffs_deflate__error__internal_error_inconsistent_distance =
    "#deflate: internal error: inconsistent distance";
const char* wuffs_deflate__error__internal_error_inconsistent_n_bits =
    "#deflate: internal error: inconsistent n_bits";

// ---------------- Private Consts

static const uint8_t               //
    wuffs_deflate__code_order[19]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15,
};

static const uint8_t              //
    wuffs_deflate__reverse8[256]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        0,   128, 64,  192, 32,  160, 96,  224, 16,  144, 80,  208, 48,  176,
        112, 240, 8,   136, 72,  200, 40,  168, 104, 232, 24,  152, 88,  216,
        56,  184, 120, 248, 4,   132, 68,  196, 36,  164, 100, 228, 20,  148,
        84,  212, 52,  180, 116, 244, 12,  140, 76,  204, 44,  172, 108, 236,
        28,  156, 92,  220, 60,  188, 124, 252, 2,   130, 66,  194, 34,  162,
        98,  226, 18,  146, 82,  210, 50,  178, 114, 242, 10,  138, 74,  202,
        42,  170, 106, 234, 26,  154, 90,  218, 58,  186, 122, 250, 6,   134,
        70,  198, 38,  166, 102, 230, 22,  150, 86,  214, 54,  182, 118, 246,
        14,  142, 78,  206, 46,  174, 110, 238, 30,  158, 94,  222, 62,  190,
        126, 254, 1,   129, 65,  193, 33,  161, 97,  225, 17,  145, 81,  209,
        49,  177, 113, 241, 9,   137, 73,  201, 41,  169, 105, 233, 25,  153,
        89,  217, 57,  185, 121, 249, 5,   133, 69,  197, 37,  165, 101, 229,
        21,  149, 85,  213, 53,  181, 117, 245, 13,  141, 77,  205, 45,  173,
        109, 237, 29,  157, 93,  221, 61,  189, 125, 253, 3,   131, 67,  195,
        35,  163, 99,  227, 19,  147, 83,  211, 51,  179, 115, 243, 11,  139,
        75,  203, 43,  171, 107, 235, 27,  155, 91,  219, 59,  187, 123, 251,
        7,   135, 71,  199, 39,  167, 103, 231, 23,  151, 87,  215, 55,  183,
        119, 247, 15,  143, 79,  207, 47,  175, 111, 239, 31,  159, 95,  223,
        63,  191, 127, 255,
};

static const uint32_t                       //
    wuffs_deflate__lcode_magic_numbers[32]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        1073741824, 1073742080, 1073742336, 1073742592, 1073742848, 1073743104,
        1073743360, 1073743616, 1073743888, 1073744400, 1073744912, 1073745424,
        1073745952, 1073746976, 1073748000, 1073749024, 1073750064, 1073752112,
        1073754160, 1073756208, 1073758272, 1073762368, 1073766464, 1073770560,
        1073774672, 1073782864, 1073791056, 1073799248, 1073807104, 134217728,
        134217728,  134217728,
};

static const uint32_t                       //
    wuffs_deflate__dcode_magic_numbers[32]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        1073741824, 1073742080, 1073742336, 1073742592, 1073742864, 1073743376,
        1073743904, 1073744928, 1073745968, 1073748016, 1073750080, 1073754176,
        1073758288, 1073766480, 1073774688, 1073791072, 1073807472, 1073840240,
        1073873024, 1073938560, 1074004112, 1074135184, 1074266272, 1074528416,
        1074790576, 1075314864, 1075839168, 1076887744, 1077936336, 1080033488,
        134217728,  134217728,
};

#define WUFFS_DEFLATE__HUFFS_TABLE_SIZE 1024

#define WUFFS_DEFLATE__HUFFS_TABLE_MASK 1023

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__status  //
wuffs_deflate__decoder__decode_blocks(wuffs_deflate__decoder* self,
                                      wuffs_base__io_buffer* a_dst,
                                      wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_deflate__decoder__decode_uncompressed(wuffs_deflate__decoder* self,
                                            wuffs_base__io_buffer* a_dst,
                                            wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_deflate__decoder__init_fixed_huffman(wuffs_deflate__decoder* self);

static wuffs_base__status  //
wuffs_deflate__decoder__init_dynamic_huffman(wuffs_deflate__decoder* self,
                                             wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_deflate__decoder__init_huff(wuffs_deflate__decoder* self,
                                  uint32_t a_which,
                                  uint32_t a_n_codes0,
                                  uint32_t a_n_codes1,
                                  uint32_t a_base_symbol);

static wuffs_base__status  //
wuffs_deflate__decoder__decode_huffman_fast(wuffs_deflate__decoder* self,
                                            wuffs_base__io_buffer* a_dst,
                                            wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_deflate__decoder__decode_huffman_slow(wuffs_deflate__decoder* self,
                                            wuffs_base__io_buffer* a_dst,
                                            wuffs_base__io_buffer* a_src);

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_deflate__decoder__initialize(wuffs_deflate__decoder* self,
                                   size_t sizeof_star_self,
                                   uint64_t wuffs_version,
                                   uint32_t initialize_flags) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__error__bad_sizeof_receiver;
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__error__bad_wuffs_version;
  }

  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
// The whole point of this if-check is to detect an uninitialized *self.
// We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  return NULL;
}

size_t  //
sizeof__wuffs_deflate__decoder() {
  return sizeof(wuffs_deflate__decoder);
}

// ---------------- Function Implementations

// -------- func deflate.decoder.add_history

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_deflate__decoder__add_history(wuffs_deflate__decoder* self,
                                    wuffs_base__slice_u8 a_hist) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  wuffs_base__slice_u8 v_s = {0};
  uint64_t v_n_copied = 0;
  uint32_t v_already_full = 0;

  v_s = a_hist;
  if (((uint64_t)(v_s.len)) >= 32768) {
    v_s = wuffs_base__slice_u8__suffix(v_s, 32768);
    wuffs_base__slice_u8__copy_from_slice(
        wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
    self->private_impl.f_history_index = 32768;
  } else {
    v_n_copied = wuffs_base__slice_u8__copy_from_slice(
        wuffs_base__slice_u8__subslice_i(
            wuffs_base__make_slice_u8(self->private_data.f_history, 32768),
            (self->private_impl.f_history_index & 32767)),
        v_s);
    if (v_n_copied < ((uint64_t)(v_s.len))) {
      v_s = wuffs_base__slice_u8__subslice_i(v_s, v_n_copied);
      v_n_copied = wuffs_base__slice_u8__copy_from_slice(
          wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
      self->private_impl.f_history_index =
          (((uint32_t)((v_n_copied & 32767))) + 32768);
    } else {
      v_already_full = 0;
      if (self->private_impl.f_history_index >= 32768) {
        v_already_full = 32768;
      }
      self->private_impl.f_history_index =
          ((self->private_impl.f_history_index & 32767) +
           ((uint32_t)((v_n_copied & 32767))) + v_already_full);
    }
  }
  return wuffs_base__make_empty_struct();
}

// -------- func deflate.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_deflate__decoder__workbuf_len(const wuffs_deflate__decoder* self) {
  if (!self) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }

  return wuffs_base__utility__make_range_ii_u64(1, 1);
}

// -------- func deflate.decoder.decode_io_writer

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_deflate__decoder__decode_io_writer(wuffs_deflate__decoder* self,
                                         wuffs_base__io_buffer* a_dst,
                                         wuffs_base__io_buffer* a_src,
                                         wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
               ? wuffs_base__error__disabled_by_previous_error
               : wuffs_base__error__initialize_not_called;
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__bad_argument;
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__interleaved_coroutine_calls;
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = NULL;

  uint64_t v_mark = 0;
  wuffs_base__status v_status = NULL;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_io_writer[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (true) {
      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
      {
        if (a_dst) {
          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
        }
        wuffs_base__status t_0 =
            wuffs_deflate__decoder__decode_blocks(self, a_dst, a_src);
        if (a_dst) {
          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
        }
        v_status = t_0;
      }
      if (!wuffs_base__status__is_suspension(v_status)) {
        status = v_status;
        if (wuffs_base__status__is_error(status)) {
          goto exit;
        } else if (wuffs_base__status__is_suspension(status)) {
          status = wuffs_base__error__cannot_return_a_suspension;
          goto exit;
        }
        goto ok;
      }
      wuffs_deflate__decoder__add_history(
          self, wuffs_base__io__since(
                    v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)), io0_a_dst));
      status = v_status;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
    }

    goto ok;
  ok:
    self->private_impl.p_decode_io_writer[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_io_writer[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine =
      wuffs_base__status__is_suspension(status) ? 1 : 0;

  goto exit;
exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }

  if (wuffs_base__status__is_error(status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func deflate.decoder.decode_blocks

static wuffs_base__status  //
wuffs_deflate__decoder__decode_blocks(wuffs_deflate__decoder* self,
                                      wuffs_base__io_buffer* a_dst,
                                      wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint32_t v_final = 0;
  uint32_t v_b0 = 0;
  uint32_t v_type = 0;
  wuffs_base__status v_status = NULL;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_blocks[0];
  if (coro_susp_point) {
    v_final = self->private_data.s_decode_blocks[0].v_final;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

  label_0_continue:;
    while (v_final == 0) {
      while (self->private_impl.f_n_bits < 3) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint32_t t_0 = *iop_a_src++;
          v_b0 = t_0;
        }
        self->private_impl.f_bits |= (v_b0 << self->private_impl.f_n_bits);
        self->private_impl.f_n_bits += 8;
      }
      v_final = (self->private_impl.f_bits & 1);
      v_type = ((self->private_impl.f_bits >> 1) & 3);
      self->private_impl.f_bits >>= 3;
      self->private_impl.f_n_bits -= 3;
      if (v_type == 0) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        status =
            wuffs_deflate__decoder__decode_uncompressed(self, a_dst, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status) {
          goto suspend;
        }
        goto label_0_continue;
      } else if (v_type == 1) {
        v_status = wuffs_deflate__decoder__init_fixed_huffman(self);
        if (!wuffs_base__status__is_ok(v_status)) {
          status = v_status;
          if (wuffs_base__status__is_error(status)) {
            goto exit;
          } else if (wuffs_base__status__is_suspension(status)) {
            status = wuffs_base__error__cannot_return_a_suspension;
            goto exit;
          }
          goto ok;
        }
      } else if (v_type == 2) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
        status = wuffs_deflate__decoder__init_dynamic_huffman(self, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status) {
          goto suspend;
        }
      } else {
        status = wuffs_deflate__error__bad_block;
        goto exit;
      }
      self->private_impl.f_end_of_block = false;
      while (true) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        v_status =
            wuffs_deflate__decoder__decode_huffman_fast(self, a_dst, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (wuffs_base__status__is_error(v_status)) {
          status = v_status;
          goto exit;
        }
        if (self->private_impl.f_end_of_block) {
          goto label_0_continue;
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        status =
            wuffs_deflate__decoder__decode_huffman_slow(self, a_dst, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status) {
          goto suspend;
        }
        if (self->private_impl.f_end_of_block) {
          goto label_0_continue;
        }
      }
    }

    goto ok;
  ok:
    self->private_impl.p_decode_blocks[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_blocks[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_data.s_decode_blocks[0].v_final = v_final;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func deflate.decoder.decode_uncompressed

static wuffs_base__status  //
wuffs_deflate__decoder__decode_uncompressed(wuffs_deflate__decoder* self,
                                            wuffs_base__io_buffer* a_dst,
                                            wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint32_t v_length = 0;
  uint32_t v_n_copied = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_uncompressed[0];
  if (coro_susp_point) {
    v_length = self->private_data.s_decode_uncompressed[0].v_length;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if ((self->private_impl.f_n_bits >= 8) ||
        ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) !=
         0)) {
      status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
      goto exit;
    }
    self->private_impl.f_n_bits = 0;
    self->private_impl.f_bits = 0;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint32_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_0 = wuffs_base__load_u32le(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_uncompressed[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch =
              &self->private_data.s_decode_uncompressed[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
          if (num_bits_0 == 24) {
            t_0 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0)) << 56;
        }
      }
      v_length = t_0;
    }
    if ((((v_length)&0xFFFF) + ((v_length) >> (32 - (16)))) != 65535) {
      status = wuffs_deflate__error__inconsistent_stored_block_length;
      goto exit;
    }
    v_length = ((v_length)&0xFFFF);
    while (true) {
      v_n_copied = wuffs_base__io_writer__copy_n_from_reader(
          &iop_a_dst, io2_a_dst, v_length, &iop_a_src, io2_a_src);
      if (v_length <= v_n_copied) {
        status = NULL;
        goto ok;
      }
      v_length -= v_n_copied;
      if (((uint64_t)(io2_a_dst - iop_a_dst)) == 0) {
        status = wuffs_base__suspension__short_write;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
      } else {
        status = wuffs_base__suspension__short_read;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
      }
    }

    goto ok;
  ok:
    self->private_impl.p_decode_uncompressed[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_uncompressed[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_data.s_decode_uncompressed[0].v_length = v_length;

  goto exit;
exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func deflate.decoder.init_fixed_huffman

static wuffs_base__status  //
wuffs_deflate__decoder__init_fixed_huffman(wuffs_deflate__decoder* self) {
  uint32_t v_i = 0;
  wuffs_base__status v_status = NULL;

  while (v_i < 144) {
    self->private_data.f_code_lengths[v_i] = 8;
    v_i += 1;
  }
  while (v_i < 256) {
    self->private_data.f_code_lengths[v_i] = 9;
    v_i += 1;
  }
  while (v_i < 280) {
    self->private_data.f_code_lengths[v_i] = 7;
    v_i += 1;
  }
  while (v_i < 288) {
    self->private_data.f_code_lengths[v_i] = 8;
    v_i += 1;
  }
  while (v_i < 320) {
    self->private_data.f_code_lengths[v_i] = 5;
    v_i += 1;
  }
  v_status = wuffs_deflate__decoder__init_huff(self, 0, 0, 288, 257);
  if (wuffs_base__status__is_error(v_status)) {
    return v_status;
  }
  v_status = wuffs_deflate__decoder__init_huff(self, 1, 288, 320, 0);
  if (wuffs_base__status__is_error(v_status)) {
    return v_status;
  }
  return NULL;
}

// -------- func deflate.decoder.init_dynamic_huffman

static wuffs_base__status  //
wuffs_deflate__decoder__init_dynamic_huffman(wuffs_deflate__decoder* self,
                                             wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint32_t v_bits = 0;
  uint32_t v_n_bits = 0;
  uint32_t v_b0 = 0;
  uint32_t v_n_lit = 0;
  uint32_t v_n_dist = 0;
  uint32_t v_n_clen = 0;
  uint32_t v_i = 0;
  uint32_t v_b1 = 0;
  wuffs_base__status v_status = NULL;
  uint32_t v_mask = 0;
  uint32_t v_table_entry = 0;
  uint32_t v_table_entry_n_bits = 0;
  uint32_t v_b2 = 0;
  uint32_t v_n_extra_bits = 0;
  uint8_t v_rep_symbol = 0;
  uint32_t v_rep_count = 0;
  uint32_t v_b3 = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_init_dynamic_huffman[0];
  if (coro_susp_point) {
    v_bits = self->private_data.s_init_dynamic_huffman[0].v_bits;
    v_n_bits = self->private_data.s_init_dynamic_huffman[0].v_n_bits;
    v_n_lit = self->private_data.s_init_dynamic_huffman[0].v_n_lit;
    v_n_dist = self->private_data.s_init_dynamic_huffman[0].v_n_dist;
    v_n_clen = self->private_data.s_init_dynamic_huffman[0].v_n_clen;
    v_i = self->private_data.s_init_dynamic_huffman[0].v_i;
    v_mask = self->private_data.s_init_dynamic_huffman[0].v_mask;
    v_table_entry = self->private_data.s_init_dynamic_huffman[0].v_table_entry;
    v_n_extra_bits =
        self->private_data.s_init_dynamic_huffman[0].v_n_extra_bits;
    v_rep_symbol = self->private_data.s_init_dynamic_huffman[0].v_rep_symbol;
    v_rep_count = self->private_data.s_init_dynamic_huffman[0].v_rep_count;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    v_bits = self->private_impl.f_bits;
    v_n_bits = self->private_impl.f_n_bits;
    while (v_n_bits < 14) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__suspension__short_read;
          goto suspend;
        }
        uint32_t t_0 = *iop_a_src++;
        v_b0 = t_0;
      }
      v_bits |= (v_b0 << v_n_bits);
      v_n_bits += 8;
    }
    v_n_lit = (((v_bits)&0x1F) + 257);
    if (v_n_lit > 286) {
      status = wuffs_deflate__error__bad_literal_length_code_count;
      goto exit;
    }
    v_bits >>= 5;
    v_n_dist = (((v_bits)&0x1F) + 1);
    if (v_n_dist > 30) {
      status = wuffs_deflate__error__bad_distance_code_count;
      goto exit;
    }
    v_bits >>= 5;
    v_n_clen = (((v_bits)&0xF) + 4);
    v_bits >>= 4;
    v_n_bits -= 14;
    v_i = 0;
    while (v_i < v_n_clen) {
      while (v_n_bits < 3) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint32_t t_1 = *iop_a_src++;
          v_b1 = t_1;
        }
        v_bits |= (v_b1 << v_n_bits);
        v_n_bits += 8;
      }
      self->private_data.f_code_lengths[wuffs_deflate__code_order[v_i]] =
          ((uint8_t)((v_bits & 7)));
      v_bits >>= 3;
      v_n_bits -= 3;
      v_i += 1;
    }
    while (v_i < 19) {
      self->private_data.f_code_lengths[wuffs_deflate__code_order[v_i]] = 0;
      v_i += 1;
    }
    v_status = wuffs_deflate__decoder__init_huff(self, 0, 0, 19, 4095);
    if (wuffs_base__status__is_error(v_status)) {
      status = v_status;
      goto exit;
    }
    v_mask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
    v_i = 0;
  label_0_continue:;
    while (v_i < (v_n_lit + v_n_dist)) {
      while (true) {
        v_table_entry = self->private_data.f_huffs[0][(v_bits & v_mask)];
        v_table_entry_n_bits = (v_table_entry & 15);
        if (v_n_bits >= v_table_entry_n_bits) {
          v_bits >>= v_table_entry_n_bits;
          v_n_bits -= v_table_entry_n_bits;
          goto label_1_break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint32_t t_2 = *iop_a_src++;
          v_b2 = t_2;
        }
        v_bits |= (v_b2 << v_n_bits);
        v_n_bits += 8;
      }
    label_1_break:;
      if ((v_table_entry >> 24) != 128) {
        status =
            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
        goto exit;
      }
      v_table_entry = ((v_table_entry >> 8) & 255);
      if (v_table_entry < 16) {
        self->private_data.f_code_lengths[v_i] = ((uint8_t)(v_table_entry));
        v_i += 1;
        goto label_0_continue;
      }
      v_n_extra_bits = 0;
      v_rep_symbol = 0;
      v_rep_count = 0;
      if (v_table_entry == 16) {
        v_n_extra_bits = 2;
        if (v_i <= 0) {
          status = wuffs_deflate__error__bad_huffman_code_length_repetition;
          goto exit;
        }
        v_rep_symbol = (self->private_data.f_code_lengths[(v_i - 1)] & 15);
        v_rep_count = 3;
      } else if (v_table_entry == 17) {
        v_n_extra_bits = 3;
        v_rep_symbol = 0;
        v_rep_count = 3;
      } else if (v_table_entry == 18) {
        v_n_extra_bits = 7;
        v_rep_symbol = 0;
        v_rep_count = 11;
      } else {
        status =
            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
        goto exit;
      }
      while (v_n_bits < v_n_extra_bits) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint32_t t_3 = *iop_a_src++;
          v_b3 = t_3;
        }
        v_bits |= (v_b3 << v_n_bits);
        v_n_bits += 8;
      }
      v_rep_count += ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_n_extra_bits));
      v_bits >>= v_n_extra_bits;
      v_n_bits -= v_n_extra_bits;
      while (v_rep_count > 0) {
        if (v_i >= (v_n_lit + v_n_dist)) {
          status = wuffs_deflate__error__bad_huffman_code_length_count;
          goto exit;
        }
        self->private_data.f_code_lengths[v_i] = v_rep_symbol;
        v_i += 1;
        v_rep_count -= 1;
      }
    }
    if (v_i != (v_n_lit + v_n_dist)) {
      status = wuffs_deflate__error__bad_huffman_code_length_count;
      goto exit;
    }
    if (self->private_data.f_code_lengths[256] == 0) {
      status = wuffs_deflate__error__missing_end_of_block_code;
      goto exit;
    }
    v_status = wuffs_deflate__decoder__init_huff(self, 0, 0, v_n_lit, 257);
    if (wuffs_base__status__is_error(v_status)) {
      status = v_status;
      goto exit;
    }
    v_status = wuffs_deflate__decoder__init_huff(self, 1, v_n_lit,
                                                 (v_n_lit + v_n_dist), 0);
    if (wuffs_base__status__is_error(v_status)) {
      status = v_status;
      goto exit;
    }
    self->private_impl.f_bits = v_bits;
    self->private_impl.f_n_bits = v_n_bits;

    goto ok;
  ok:
    self->private_impl.p_init_dynamic_huffman[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_init_dynamic_huffman[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_data.s_init_dynamic_huffman[0].v_bits = v_bits;
  self->private_data.s_init_dynamic_huffman[0].v_n_bits = v_n_bits;
  self->private_data.s_init_dynamic_huffman[0].v_n_lit = v_n_lit;
  self->private_data.s_init_dynamic_huffman[0].v_n_dist = v_n_dist;
  self->private_data.s_init_dynamic_huffman[0].v_n_clen = v_n_clen;
  self->private_data.s_init_dynamic_huffman[0].v_i = v_i;
  self->private_data.s_init_dynamic_huffman[0].v_mask = v_mask;
  self->private_data.s_init_dynamic_huffman[0].v_table_entry = v_table_entry;
  self->private_data.s_init_dynamic_huffman[0].v_n_extra_bits = v_n_extra_bits;
  self->private_data.s_init_dynamic_huffman[0].v_rep_symbol = v_rep_symbol;
  self->private_data.s_init_dynamic_huffman[0].v_rep_count = v_rep_count;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func deflate.decoder.init_huff

static wuffs_base__status  //
wuffs_deflate__decoder__init_huff(wuffs_deflate__decoder* self,
                                  uint32_t a_which,
                                  uint32_t a_n_codes0,
                                  uint32_t a_n_codes1,
                                  uint32_t a_base_symbol) {
  uint16_t v_counts[16] = {0};
  uint32_t v_i = 0;
  uint32_t v_remaining = 0;
  uint16_t v_offsets[16] = {0};
  uint32_t v_n_symbols = 0;
  uint32_t v_count = 0;
  uint16_t v_symbols[320] = {0};
  uint32_t v_min_cl = 0;
  uint32_t v_max_cl = 0;
  uint32_t v_initial_high_bits = 0;
  uint32_t v_prev_cl = 0;
  uint32_t v_prev_redirect_key = 0;
  uint32_t v_top = 0;
  uint32_t v_next_top = 0;
  uint32_t v_code = 0;
  uint32_t v_key = 0;
  uint32_t v_value = 0;
  uint32_t v_cl = 0;
  uint32_t v_redirect_key = 0;
  uint32_t v_j = 0;
  uint32_t v_reversed_key = 0;
  uint32_t v_symbol = 0;
  uint32_t v_high_bits = 0;
  uint32_t v_delta = 0;

  v_i = a_n_codes0;
  while (v_i < a_n_codes1) {
    if (v_counts[(self->private_data.f_code_lengths[v_i] & 15)] >= 320) {
      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
    }
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
    v_counts[(self->private_data.f_code_lengths[v_i] & 15)] += 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
    v_i += 1;
  }
  if ((((uint32_t)(v_counts[0])) + a_n_codes0) == a_n_codes1) {
    return wuffs_deflate__error__no_huffman_codes;
  }
  v_remaining = 1;
  v_i = 1;
  while (v_i <= 15) {
    if (v_remaining > 1073741824) {
      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
    }
    v_remaining <<= 1;
    if (v_remaining < ((uint32_t)(v_counts[v_i]))) {
      return wuffs_deflate__error__bad_huffman_code_over_subscribed;
    }
    v_remaining -= ((uint32_t)(v_counts[v_i]));
    v_i += 1;
  }
  if (v_remaining != 0) {
    if ((a_which == 1) && (v_counts[1] == 1) &&
        (self->private_data.f_code_lengths[a_n_codes0] == 1) &&
        ((((uint32_t)(v_counts[0])) + a_n_codes0 + 1) == a_n_codes1)) {
      self->private_impl.f_n_huffs_bits[1] = 1;
      self->private_data.f_huffs[1][0] =
          (wuffs_deflate__dcode_magic_numbers[0] | 1);
      self->private_data.f_huffs[1][1] =
          (wuffs_deflate__dcode_magic_numbers[31] | 1);
      return NULL;
    }
    return wuffs_deflate__error__bad_huffman_code_under_subscribed;
  }
  v_i = 1;
  while (v_i <= 15) {
    v_offsets[v_i] = ((uint16_t)(v_n_symbols));
    v_count = ((uint32_t)(v_counts[v_i]));
    if (v_n_symbols > (320 - v_count)) {
      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
    }
    v_n_symbols = (v_n_symbols + v_count);
    v_i += 1;
  }
  if (v_n_symbols > 288) {
    return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
  }
  v_i = a_n_codes0;
  while (v_i < a_n_codes1) {
    if (v_i < a_n_codes0) {
      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
    }
    if (self->private_data.f_code_lengths[v_i] != 0) {
      if (v_offsets[(self->private_data.f_code_lengths[v_i] & 15)] >= 320) {
        return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
      }
      v_symbols[v_offsets[(self->private_data.f_code_lengths[v_i] & 15)]] =
          ((uint16_t)((v_i - a_n_codes0)));
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
      v_offsets[(self->private_data.f_code_lengths[v_i] & 15)] += 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
    }
    v_i += 1;
  }
  v_min_cl = 1;
  while (true) {
    if (v_counts[v_min_cl] != 0) {
      goto label_0_break;
    }
    if (v_min_cl >= 9) {
      return wuffs_deflate__error__bad_huffman_minimum_code_length;
    }
    v_min_cl += 1;
  }
label_0_break:;
  v_max_cl = 15;
  while (true) {
    if (v_counts[v_max_cl] != 0) {
      goto label_1_break;
    }
    if (v_max_cl <= 1) {
      return wuffs_deflate__error__no_huffman_codes;
    }
    v_max_cl -= 1;
  }
label_1_break:;
  if (v_max_cl <= 9) {
    self->private_impl.f_n_huffs_bits[a_which] = v_max_cl;
  } else {
    self->private_impl.f_n_huffs_bits[a_which] = 9;
  }
  v_i = 0;
  if ((v_n_symbols != ((uint32_t)(v_offsets[v_max_cl]))) ||
      (v_n_symbols != ((uint32_t)(v_offsets[15])))) {
    return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
  }
  if ((a_n_codes0 + ((uint32_t)(v_symbols[0]))) >= 320) {
    return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
  }
  v_initial_high_bits = 512;
  if (v_max_cl < 9) {
    v_initial_high_bits = (((uint32_t)(1)) << v_max_cl);
  }
  v_prev_cl = ((uint32_t)((self->private_data.f_code_lengths[(
                               a_n_codes0 + ((uint32_t)(v_symbols[0])))] &
                           15)));
  v_prev_redirect_key = 4294967295;
  v_top = 0;
  v_next_top = 512;
  v_code = 0;
  v_key = 0;
  v_value = 0;
  while (true) {
    if ((a_n_codes0 + ((uint32_t)(v_symbols[v_i]))) >= 320) {
      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
    }
    v_cl = ((uint32_t)((self->private_data.f_code_lengths[(
                            a_n_codes0 + ((uint32_t)(v_symbols[v_i])))] &
                        15)));
    if (v_cl > v_prev_cl) {
      v_code <<= (v_cl - v_prev_cl);
      if (v_code >= 32768) {
        return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
      }
    }
    v_prev_cl = v_cl;
    v_key = v_code;
    if (v_cl > 9) {
      v_cl -= 9;
      v_redirect_key = ((v_key >> v_cl) & 511);
      v_key = ((v_key)&WUFFS_BASE__LOW_BITS_MASK__U32(v_cl));
      if (v_prev_redirect_key != v_redirect_key) {
        v_prev_redirect_key = v_redirect_key;
        v_remaining = (((uint32_t)(1)) << v_cl);
        v_j = v_prev_cl;
        while (v_j <= 15) {
          if (v_remaining <= ((uint32_t)(v_counts[v_j]))) {
            goto label_2_break;
          }
          v_remaining -= ((uint32_t)(v_counts[v_j]));
          if (v_remaining > 1073741824) {
            return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
          }
          v_remaining <<= 1;
          v_j += 1;
        }
      label_2_break:;
        if ((v_j <= 9) || (15 < v_j)) {
          return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
        }
        v_j -= 9;
        v_initial_high_bits = (((uint32_t)(1)) << v_j);
        v_top = v_next_top;
        if ((v_top + (((uint32_t)(1)) << v_j)) > 1024) {
          return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
        }
        v_next_top = (v_top + (((uint32_t)(1)) << v_j));
        v_redirect_key =
            (((uint32_t)(wuffs_deflate__reverse8[(v_redirect_key >> 1)])) |
             ((v_redirect_key & 1) << 8));
        self->private_data.f_huffs[a_which][v_redirect_key] =
            (268435465 | (v_top << 8) | (v_j << 4));
      }
    }
    if ((v_key >= 512) || (v_counts[v_prev_cl] <= 0)) {
      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
    }
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
    v_counts[v_prev_cl] -= 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
    v_reversed_key = (((uint32_t)(wuffs_deflate__reverse8[(v_key >> 1)])) |
                      ((v_key & 1) << 8));
    v_reversed_key >>= (9 - v_cl);
    v_symbol = ((uint32_t)(v_symbols[v_i]));
    if (v_symbol == 256) {
      v_value = (536870912 | v_cl);
    } else if ((v_symbol < 256) && (a_which == 0)) {
      v_value = (2147483648 | (v_symbol << 8) | v_cl);
    } else if (v_symbol >= a_base_symbol) {
      v_symbol -= a_base_symbol;
      if (a_which == 0) {
        v_value = (wuffs_deflate__lcode_magic_numbers[(v_symbol & 31)] | v_cl);
      } else {
        v_value = (wuffs_deflate__dcode_magic_numbers[(v_symbol & 31)] | v_cl);
      }
    } else {
      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
    }
    v_high_bits = v_initial_high_bits;
    v_delta = (((uint32_t)(1)) << v_cl);
    while (v_high_bits >= v_delta) {
      v_high_bits -= v_delta;
      if ((v_top + ((v_high_bits | v_reversed_key) & 511)) >= 1024) {
        return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
      }
      self->private_data
          .f_huffs[a_which][(v_top + ((v_high_bits | v_reversed_key) & 511))] =
          v_value;
    }
    v_i += 1;
    if (v_i >= v_n_symbols) {
      goto label_3_break;
    }
    v_code += 1;
    if (v_code >= 32768) {
      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
    }
  }
label_3_break:;
  return NULL;
}

// -------- func deflate.decoder.decode_huffman_fast

static wuffs_base__status  //
wuffs_deflate__decoder__decode_huffman_fast(wuffs_deflate__decoder* self,
                                            wuffs_base__io_buffer* a_dst,
                                            wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint32_t v_bits = 0;
  uint32_t v_n_bits = 0;
  uint32_t v_table_entry = 0;
  uint32_t v_table_entry_n_bits = 0;
  uint32_t v_lmask = 0;
  uint32_t v_dmask = 0;
  uint32_t v_redir_top = 0;
  uint32_t v_redir_mask = 0;
  uint32_t v_length = 0;
  uint32_t v_dist_minus_1 = 0;
  uint32_t v_n_copied = 0;
  uint32_t v_hlen = 0;
  uint32_t v_hdist = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  if ((self->private_impl.f_n_bits >= 8) ||
      ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
    status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
    goto exit;
  }
  v_bits = self->private_impl.f_bits;
  v_n_bits = self->private_impl.f_n_bits;
  v_lmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
  v_dmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
label_0_continue:;
  while ((((uint64_t)(io2_a_dst - iop_a_dst)) >= 258) &&
         (((uint64_t)(io2_a_src - iop_a_src)) >= 12)) {
    if (v_n_bits < 15) {
      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      v_n_bits += 8;
      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      v_n_bits += 8;
    } else {
    }
    v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
    v_table_entry_n_bits = (v_table_entry & 15);
    v_bits >>= v_table_entry_n_bits;
    v_n_bits -= v_table_entry_n_bits;
    if ((v_table_entry >> 31) != 0) {
      (wuffs_base__store_u8be(iop_a_dst,
                              ((uint8_t)(((v_table_entry >> 8) & 255)))),
       iop_a_dst += 1, wuffs_base__make_empty_struct());
      goto label_0_continue;
    } else if ((v_table_entry >> 30) != 0) {
    } else if ((v_table_entry >> 29) != 0) {
      self->private_impl.f_end_of_block = true;
      goto label_0_break;
    } else if ((v_table_entry >> 28) != 0) {
      if (v_n_bits < 15) {
        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
      } else {
      }
      v_redir_top = ((v_table_entry >> 8) & 65535);
      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
      v_table_entry =
          self->private_data
              .f_huffs[0][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
      v_table_entry_n_bits = (v_table_entry & 15);
      v_bits >>= v_table_entry_n_bits;
      v_n_bits -= v_table_entry_n_bits;
      if ((v_table_entry >> 31) != 0) {
        (wuffs_base__store_u8be(iop_a_dst,
                                ((uint8_t)(((v_table_entry >> 8) & 255)))),
         iop_a_dst += 1, wuffs_base__make_empty_struct());
        goto label_0_continue;
      } else if ((v_table_entry >> 30) != 0) {
      } else if ((v_table_entry >> 29) != 0) {
        self->private_impl.f_end_of_block = true;
        goto label_0_break;
      } else if ((v_table_entry >> 28) != 0) {
        status =
            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
        goto exit;
      } else if ((v_table_entry >> 27) != 0) {
        status = wuffs_deflate__error__bad_huffman_code;
        goto exit;
      } else {
        status =
            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
        goto exit;
      }
    } else if ((v_table_entry >> 27) != 0) {
      status = wuffs_deflate__error__bad_huffman_code;
      goto exit;
    } else {
      status =
          wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
      goto exit;
    }
    v_length = (((v_table_entry >> 8) & 255) + 3);
    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
    if (v_table_entry_n_bits > 0) {
      if (v_n_bits < 15) {
        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
      } else {
      }
      v_length =
          (((v_length + 253 +
             ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) &
            255) +
           3);
      v_bits >>= v_table_entry_n_bits;
      v_n_bits -= v_table_entry_n_bits;
    } else {
    }
    if (v_n_bits < 15) {
      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      v_n_bits += 8;
      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      v_n_bits += 8;
    } else {
    }
    v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
    v_table_entry_n_bits = (v_table_entry & 15);
    v_bits >>= v_table_entry_n_bits;
    v_n_bits -= v_table_entry_n_bits;
    if ((v_table_entry >> 28) == 1) {
      if (v_n_bits < 15) {
        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
      } else {
      }
      v_redir_top = ((v_table_entry >> 8) & 65535);
      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
      v_table_entry =
          self->private_data
              .f_huffs[1][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
      v_table_entry_n_bits = (v_table_entry & 15);
      v_bits >>= v_table_entry_n_bits;
      v_n_bits -= v_table_entry_n_bits;
    } else {
    }
    if ((v_table_entry >> 24) != 64) {
      if ((v_table_entry >> 24) == 8) {
        status = wuffs_deflate__error__bad_huffman_code;
        goto exit;
      }
      status =
          wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
      goto exit;
    }
    v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
    if (v_n_bits < v_table_entry_n_bits) {
      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      v_n_bits += 8;
      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
      (iop_a_src += 1, wuffs_base__make_empty_struct());
      v_n_bits += 8;
    }
    v_dist_minus_1 =
        ((v_dist_minus_1 +
          ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) &
         32767);
    v_bits >>= v_table_entry_n_bits;
    v_n_bits -= v_table_entry_n_bits;
    v_n_copied = 0;
    while (true) {
      if (((uint64_t)((v_dist_minus_1 + 1))) >
          ((uint64_t)(iop_a_dst - io0_a_dst))) {
        v_hlen = 0;
        v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) -
                               ((uint64_t)(iop_a_dst - io0_a_dst)))));
        if (v_length > v_hdist) {
          v_length -= v_hdist;
          v_hlen = v_hdist;
        } else {
          v_hlen = v_length;
          v_length = 0;
        }
        if (self->private_impl.f_history_index < v_hdist) {
          status = wuffs_deflate__error__bad_distance;
          goto exit;
        }
        v_hdist = (self->private_impl.f_history_index - v_hdist);
        while (true) {
          v_n_copied = wuffs_base__io_writer__copy_n_from_slice(
              &iop_a_dst, io2_a_dst, v_hlen,
              wuffs_base__slice_u8__subslice_i(
                  wuffs_base__make_slice_u8(self->private_data.f_history,
                                            32768),
                  (v_hdist & 32767)));
          if (v_hlen <= v_n_copied) {
            goto label_1_break;
          }
          v_hlen -= v_n_copied;
          wuffs_base__io_writer__copy_n_from_slice(
              &iop_a_dst, io2_a_dst, v_hlen,
              wuffs_base__make_slice_u8(self->private_data.f_history, 32768));
          goto label_1_break;
        }
      label_1_break:;
        if (v_length == 0) {
          goto label_0_continue;
        }
        if (((uint64_t)((v_dist_minus_1 + 1))) >
            ((uint64_t)(iop_a_dst - io0_a_dst))) {
          status = wuffs_deflate__error__internal_error_inconsistent_distance;
          goto exit;
        }
      }
      wuffs_base__io_writer__copy_n_from_history_fast(
          &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
      goto label_2_break;
    }
  label_2_break:;
  }
label_0_break:;
  while (v_n_bits >= 8) {
    v_n_bits -= 8;
    if (iop_a_src > io1_a_src) {
      (iop_a_src--, wuffs_base__make_empty_struct());
    } else {
      status = wuffs_deflate__error__internal_error_inconsistent_i_o;
      goto exit;
    }
  }
  self->private_impl.f_bits = (v_bits & ((((uint32_t)(1)) << v_n_bits) - 1));
  self->private_impl.f_n_bits = v_n_bits;
  if ((self->private_impl.f_n_bits >= 8) ||
      ((self->private_impl.f_bits >> self->private_impl.f_n_bits) != 0)) {
    status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
    goto exit;
  }
  goto exit;
exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func deflate.decoder.decode_huffman_slow

static wuffs_base__status  //
wuffs_deflate__decoder__decode_huffman_slow(wuffs_deflate__decoder* self,
                                            wuffs_base__io_buffer* a_dst,
                                            wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint32_t v_bits = 0;
  uint32_t v_n_bits = 0;
  uint32_t v_table_entry = 0;
  uint32_t v_table_entry_n_bits = 0;
  uint32_t v_lmask = 0;
  uint32_t v_dmask = 0;
  uint32_t v_b0 = 0;
  uint32_t v_redir_top = 0;
  uint32_t v_redir_mask = 0;
  uint32_t v_b1 = 0;
  uint32_t v_length = 0;
  uint32_t v_b2 = 0;
  uint32_t v_b3 = 0;
  uint32_t v_b4 = 0;
  uint32_t v_dist_minus_1 = 0;
  uint32_t v_b5 = 0;
  uint32_t v_n_copied = 0;
  uint32_t v_hlen = 0;
  uint32_t v_hdist = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_huffman_slow[0];
  if (coro_susp_point) {
    v_bits = self->private_data.s_decode_huffman_slow[0].v_bits;
    v_n_bits = self->private_data.s_decode_huffman_slow[0].v_n_bits;
    v_table_entry = self->private_data.s_decode_huffman_slow[0].v_table_entry;
    v_table_entry_n_bits =
        self->private_data.s_decode_huffman_slow[0].v_table_entry_n_bits;
    v_lmask = self->private_data.s_decode_huffman_slow[0].v_lmask;
    v_dmask = self->private_data.s_decode_huffman_slow[0].v_dmask;
    v_redir_top = self->private_data.s_decode_huffman_slow[0].v_redir_top;
    v_redir_mask = self->private_data.s_decode_huffman_slow[0].v_redir_mask;
    v_length = self->private_data.s_decode_huffman_slow[0].v_length;
    v_dist_minus_1 = self->private_data.s_decode_huffman_slow[0].v_dist_minus_1;
    v_hlen = self->private_data.s_decode_huffman_slow[0].v_hlen;
    v_hdist = self->private_data.s_decode_huffman_slow[0].v_hdist;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if ((self->private_impl.f_n_bits >= 8) ||
        ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) !=
         0)) {
      status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
      goto exit;
    }
    v_bits = self->private_impl.f_bits;
    v_n_bits = self->private_impl.f_n_bits;
    v_lmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
    v_dmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
  label_0_continue:;
    while (!(self->private_impl.p_decode_huffman_slow[0] != 0)) {
      while (true) {
        v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
        v_table_entry_n_bits = (v_table_entry & 15);
        if (v_n_bits >= v_table_entry_n_bits) {
          v_bits >>= v_table_entry_n_bits;
          v_n_bits -= v_table_entry_n_bits;
          goto label_1_break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint32_t t_0 = *iop_a_src++;
          v_b0 = t_0;
        }
        v_bits |= (v_b0 << v_n_bits);
        v_n_bits += 8;
      }
    label_1_break:;
      if ((v_table_entry >> 31) != 0) {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        if (iop_a_dst == io2_a_dst) {
          status = wuffs_base__suspension__short_write;
          goto suspend;
        }
        *iop_a_dst++ = ((uint8_t)(((v_table_entry >> 8) & 255)));
        goto label_0_continue;
      } else if ((v_table_entry >> 30) != 0) {
      } else if ((v_table_entry >> 29) != 0) {
        self->private_impl.f_end_of_block = true;
        goto label_0_break;
      } else if ((v_table_entry >> 28) != 0) {
        v_redir_top = ((v_table_entry >> 8) & 65535);
        v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
        while (true) {
          v_table_entry =
              self->private_data
                  .f_huffs[0][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
          v_table_entry_n_bits = (v_table_entry & 15);
          if (v_n_bits >= v_table_entry_n_bits) {
            v_bits >>= v_table_entry_n_bits;
            v_n_bits -= v_table_entry_n_bits;
            goto label_2_break;
          }
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__suspension__short_read;
              goto suspend;
            }
            uint32_t t_1 = *iop_a_src++;
            v_b1 = t_1;
          }
          v_bits |= (v_b1 << v_n_bits);
          v_n_bits += 8;
        }
      label_2_break:;
        if ((v_table_entry >> 31) != 0) {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
          if (iop_a_dst == io2_a_dst) {
            status = wuffs_base__suspension__short_write;
            goto suspend;
          }
          *iop_a_dst++ = ((uint8_t)(((v_table_entry >> 8) & 255)));
          goto label_0_continue;
        } else if ((v_table_entry >> 30) != 0) {
        } else if ((v_table_entry >> 29) != 0) {
          self->private_impl.f_end_of_block = true;
          goto label_0_break;
        } else if ((v_table_entry >> 28) != 0) {
          status =
              wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
          goto exit;
        } else if ((v_table_entry >> 27) != 0) {
          status = wuffs_deflate__error__bad_huffman_code;
          goto exit;
        } else {
          status =
              wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
          goto exit;
        }
      } else if ((v_table_entry >> 27) != 0) {
        status = wuffs_deflate__error__bad_huffman_code;
        goto exit;
      } else {
        status =
            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
        goto exit;
      }
      v_length = (((v_table_entry >> 8) & 255) + 3);
      v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
      if (v_table_entry_n_bits > 0) {
        while (v_n_bits < v_table_entry_n_bits) {
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__suspension__short_read;
              goto suspend;
            }
            uint32_t t_2 = *iop_a_src++;
            v_b2 = t_2;
          }
          v_bits |= (v_b2 << v_n_bits);
          v_n_bits += 8;
        }
        v_length = (((v_length + 253 +
                      ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(
                          v_table_entry_n_bits))) &
                     255) +
                    3);
        v_bits >>= v_table_entry_n_bits;
        v_n_bits -= v_table_entry_n_bits;
      }
      while (true) {
        v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
        v_table_entry_n_bits = (v_table_entry & 15);
        if (v_n_bits >= v_table_entry_n_bits) {
          v_bits >>= v_table_entry_n_bits;
          v_n_bits -= v_table_entry_n_bits;
          goto label_3_break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint32_t t_3 = *iop_a_src++;
          v_b3 = t_3;
        }
        v_bits |= (v_b3 << v_n_bits);
        v_n_bits += 8;
      }
    label_3_break:;
      if ((v_table_entry >> 28) == 1) {
        v_redir_top = ((v_table_entry >> 8) & 65535);
        v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
        while (true) {
          v_table_entry =
              self->private_data
                  .f_huffs[1][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
          v_table_entry_n_bits = (v_table_entry & 15);
          if (v_n_bits >= v_table_entry_n_bits) {
            v_bits >>= v_table_entry_n_bits;
            v_n_bits -= v_table_entry_n_bits;
            goto label_4_break;
          }
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__suspension__short_read;
              goto suspend;
            }
            uint32_t t_4 = *iop_a_src++;
            v_b4 = t_4;
          }
          v_bits |= (v_b4 << v_n_bits);
          v_n_bits += 8;
        }
      label_4_break:;
      }
      if ((v_table_entry >> 24) != 64) {
        if ((v_table_entry >> 24) == 8) {
          status = wuffs_deflate__error__bad_huffman_code;
          goto exit;
        }
        status =
            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
        goto exit;
      }
      v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
      v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
      if (v_table_entry_n_bits > 0) {
        while (v_n_bits < v_table_entry_n_bits) {
          {
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__suspension__short_read;
              goto suspend;
            }
            uint32_t t_5 = *iop_a_src++;
            v_b5 = t_5;
          }
          v_bits |= (v_b5 << v_n_bits);
          v_n_bits += 8;
        }
        v_dist_minus_1 =
            ((v_dist_minus_1 +
              ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) &
             32767);
        v_bits >>= v_table_entry_n_bits;
        v_n_bits -= v_table_entry_n_bits;
      }
      while (true) {
        if (((uint64_t)((v_dist_minus_1 + 1))) >
            ((uint64_t)(iop_a_dst - io0_a_dst))) {
          v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) -
                                 ((uint64_t)(iop_a_dst - io0_a_dst)))));
          if (v_length > v_hdist) {
            v_length -= v_hdist;
            v_hlen = v_hdist;
          } else {
            v_hlen = v_length;
            v_length = 0;
          }
          if (self->private_impl.f_history_index < v_hdist) {
            status = wuffs_deflate__error__bad_distance;
            goto exit;
          }
          v_hdist = (self->private_impl.f_history_index - v_hdist);
          while (true) {
            v_n_copied = wuffs_base__io_writer__copy_n_from_slice(
                &iop_a_dst, io2_a_dst, v_hlen,
                wuffs_base__slice_u8__subslice_i(
                    wuffs_base__make_slice_u8(self->private_data.f_history,
                                              32768),
                    (v_hdist & 32767)));
            if (v_hlen <= v_n_copied) {
              v_hlen = 0;
              goto label_5_break;
            }
            if (v_n_copied > 0) {
              v_hlen -= v_n_copied;
              v_hdist = ((v_hdist + v_n_copied) & 32767);
              if (v_hdist == 0) {
                goto label_5_break;
              }
            }
            status = wuffs_base__suspension__short_write;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
          }
        label_5_break:;
          if (v_hlen > 0) {
            while (true) {
              v_n_copied = wuffs_base__io_writer__copy_n_from_slice(
                  &iop_a_dst, io2_a_dst, v_hlen,
                  wuffs_base__slice_u8__subslice_i(
                      wuffs_base__make_slice_u8(self->private_data.f_history,
                                                32768),
                      (v_hdist & 32767)));
              if (v_hlen <= v_n_copied) {
                v_hlen = 0;
                goto label_6_break;
              }
              v_hlen -= v_n_copied;
              v_hdist += v_n_copied;
              status = wuffs_base__suspension__short_write;
              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
            }
          label_6_break:;
          }
          if (v_length == 0) {
            goto label_0_continue;
          }
        }
        v_n_copied = wuffs_base__io_writer__copy_n_from_history(
            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
        if (v_length <= v_n_copied) {
          v_length = 0;
          goto label_7_break;
        }
        v_length -= v_n_copied;
        status = wuffs_base__suspension__short_write;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
      }
    label_7_break:;
    }
  label_0_break:;
    self->private_impl.f_bits = v_bits;
    self->private_impl.f_n_bits = v_n_bits;
    if ((self->private_impl.f_n_bits >= 8) ||
        ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) !=
         0)) {
      status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
      goto exit;
    }

    goto ok;
  ok:
    self->private_impl.p_decode_huffman_slow[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_huffman_slow[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_data.s_decode_huffman_slow[0].v_bits = v_bits;
  self->private_data.s_decode_huffman_slow[0].v_n_bits = v_n_bits;
  self->private_data.s_decode_huffman_slow[0].v_table_entry = v_table_entry;
  self->private_data.s_decode_huffman_slow[0].v_table_entry_n_bits =
      v_table_entry_n_bits;
  self->private_data.s_decode_huffman_slow[0].v_lmask = v_lmask;
  self->private_data.s_decode_huffman_slow[0].v_dmask = v_dmask;
  self->private_data.s_decode_huffman_slow[0].v_redir_top = v_redir_top;
  self->private_data.s_decode_huffman_slow[0].v_redir_mask = v_redir_mask;
  self->private_data.s_decode_huffman_slow[0].v_length = v_length;
  self->private_data.s_decode_huffman_slow[0].v_dist_minus_1 = v_dist_minus_1;
  self->private_data.s_decode_huffman_slow[0].v_hlen = v_hlen;
  self->private_data.s_decode_huffman_slow[0].v_hdist = v_hdist;

  goto exit;
exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__DEFLATE)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__LZW)

// ---------------- Status Codes Implementations

const char* wuffs_lzw__error__bad_code = "#lzw: bad code";
const char* wuffs_lzw__error__internal_error_inconsistent_i_o =
    "#lzw: internal error: inconsistent I/O";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__empty_struct  //
wuffs_lzw__decoder__read_from(wuffs_lzw__decoder* self,
                              wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_lzw__decoder__write_to(wuffs_lzw__decoder* self,
                             wuffs_base__io_buffer* a_dst);

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_lzw__decoder__initialize(wuffs_lzw__decoder* self,
                               size_t sizeof_star_self,
                               uint64_t wuffs_version,
                               uint32_t initialize_flags) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__error__bad_sizeof_receiver;
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__error__bad_wuffs_version;
  }

  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
// The whole point of this if-check is to detect an uninitialized *self.
// We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  self->private_impl.magic = WUFFS_BASE__MAGIC;
  return NULL;
}

size_t  //
sizeof__wuffs_lzw__decoder() {
  return sizeof(wuffs_lzw__decoder);
}

// ---------------- Function Implementations

// -------- func lzw.decoder.set_literal_width

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_lzw__decoder__set_literal_width(wuffs_lzw__decoder* self, uint32_t a_lw) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }
  if (a_lw > 8) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__make_empty_struct();
  }

  self->private_impl.f_set_literal_width_arg = (a_lw + 1);
  return wuffs_base__make_empty_struct();
}

// -------- func lzw.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_lzw__decoder__workbuf_len(const wuffs_lzw__decoder* self) {
  if (!self) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }

  return wuffs_base__utility__make_range_ii_u64(0, 0);
}

// -------- func lzw.decoder.decode_io_writer

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_lzw__decoder__decode_io_writer(wuffs_lzw__decoder* self,
                                     wuffs_base__io_buffer* a_dst,
                                     wuffs_base__io_buffer* a_src,
                                     wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
               ? wuffs_base__error__disabled_by_previous_error
               : wuffs_base__error__initialize_not_called;
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__bad_argument;
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__interleaved_coroutine_calls;
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = NULL;

  uint32_t v_i = 0;

  uint32_t coro_susp_point = self->private_impl.p_decode_io_writer[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_impl.f_literal_width = 8;
    if (self->private_impl.f_set_literal_width_arg > 0) {
      self->private_impl.f_literal_width =
          (self->private_impl.f_set_literal_width_arg - 1);
    }
    self->private_impl.f_clear_code =
        (((uint32_t)(1)) << self->private_impl.f_literal_width);
    self->private_impl.f_end_code = (self->private_impl.f_clear_code + 1);
    self->private_impl.f_save_code = self->private_impl.f_end_code;
    self->private_impl.f_prev_code = self->private_impl.f_end_code;
    self->private_impl.f_width = (self->private_impl.f_literal_width + 1);
    self->private_impl.f_bits = 0;
    self->private_impl.f_n_bits = 0;
    self->private_impl.f_output_ri = 0;
    self->private_impl.f_output_wi = 0;
    v_i = 0;
    while (v_i < self->private_impl.f_clear_code) {
      self->private_data.f_lm1s[v_i] = 0;
      self->private_data.f_suffixes[v_i][0] = ((uint8_t)(v_i));
      v_i += 1;
    }
  label_0_continue:;
    while (true) {
      wuffs_lzw__decoder__read_from(self, a_src);
      if (self->private_impl.f_output_wi > 0) {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        status = wuffs_lzw__decoder__write_to(self, a_dst);
        if (status) {
          goto suspend;
        }
      }
      if (self->private_impl.f_read_from_return_value == 0) {
        goto label_0_break;
      } else if (self->private_impl.f_read_from_return_value == 1) {
        goto label_0_continue;
      } else if (self->private_impl.f_read_from_return_value == 2) {
        status = wuffs_base__suspension__short_read;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
      } else if (self->private_impl.f_read_from_return_value == 3) {
        status = wuffs_lzw__error__bad_code;
        goto exit;
      } else {
        status = wuffs_lzw__error__internal_error_inconsistent_i_o;
        goto exit;
      }
    }
  label_0_break:;

    goto ok;
  ok:
    self->private_impl.p_decode_io_writer[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_io_writer[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine =
      wuffs_base__status__is_suspension(status) ? 1 : 0;

  goto exit;
exit:
  if (wuffs_base__status__is_error(status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func lzw.decoder.read_from

static wuffs_base__empty_struct  //
wuffs_lzw__decoder__read_from(wuffs_lzw__decoder* self,
                              wuffs_base__io_buffer* a_src) {
  uint32_t v_clear_code = 0;
  uint32_t v_end_code = 0;
  uint32_t v_save_code = 0;
  uint32_t v_prev_code = 0;
  uint32_t v_width = 0;
  uint32_t v_bits = 0;
  uint32_t v_n_bits = 0;
  uint32_t v_output_wi = 0;
  uint32_t v_code = 0;
  uint32_t v_c = 0;
  uint32_t v_o = 0;
  uint32_t v_steps = 0;
  uint8_t v_first_byte = 0;
  uint16_t v_lm1_b = 0;
  uint16_t v_lm1_a = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  v_clear_code = self->private_impl.f_clear_code;
  v_end_code = self->private_impl.f_end_code;
  v_save_code = self->private_impl.f_save_code;
  v_prev_code = self->private_impl.f_prev_code;
  v_width = self->private_impl.f_width;
  v_bits = self->private_impl.f_bits;
  v_n_bits = self->private_impl.f_n_bits;
  v_output_wi = self->private_impl.f_output_wi;
  while (true) {
    if (v_n_bits < v_width) {
      if (((uint64_t)(io2_a_src - iop_a_src)) >= 4) {
        v_bits |= (wuffs_base__load_u32le(iop_a_src) << v_n_bits);
        (iop_a_src += ((31 - v_n_bits) >> 3), wuffs_base__make_empty_struct());
        v_n_bits |= 24;
      } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
        self->private_impl.f_read_from_return_value = 2;
        goto label_0_break;
      } else {
        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        v_n_bits += 8;
        if (v_n_bits >= v_width) {
        } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          self->private_impl.f_read_from_return_value = 2;
          goto label_0_break;
        } else {
          v_bits |=
              (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
          (iop_a_src += 1, wuffs_base__make_empty_struct());
          v_n_bits += 8;
          if (v_n_bits < v_width) {
            self->private_impl.f_read_from_return_value = 4;
            goto label_0_break;
          }
        }
      }
    }
    v_code = ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_width));
    v_bits >>= v_width;
    v_n_bits -= v_width;
    if (v_code < v_clear_code) {
      self->private_data.f_output[v_output_wi] = ((uint8_t)(v_code));
      v_output_wi = ((v_output_wi + 1) & 8191);
      if (v_save_code <= 4095) {
        v_lm1_a = ((self->private_data.f_lm1s[v_prev_code] + 1) & 4095);
        self->private_data.f_lm1s[v_save_code] = v_lm1_a;
        if ((v_lm1_a % 8) != 0) {
          self->private_impl.f_prefixes[v_save_code] =
              self->private_impl.f_prefixes[v_prev_code];
          memcpy(self->private_data.f_suffixes[v_save_code],
                 self->private_data.f_suffixes[v_prev_code],
                 sizeof(self->private_data.f_suffixes[v_save_code]));
          self->private_data.f_suffixes[v_save_code][(v_lm1_a % 8)] =
              ((uint8_t)(v_code));
        } else {
          self->private_impl.f_prefixes[v_save_code] =
              ((uint16_t)(v_prev_code));
          self->private_data.f_suffixes[v_save_code][0] = ((uint8_t)(v_code));
        }
        v_save_code += 1;
        if (v_width < 12) {
          v_width += (1 & (v_save_code >> v_width));
        }
        v_prev_code = v_code;
      }
    } else if (v_code <= v_end_code) {
      if (v_code == v_end_code) {
        self->private_impl.f_read_from_return_value = 0;
        goto label_0_break;
      }
      v_save_code = v_end_code;
      v_prev_code = v_end_code;
      v_width = (self->private_impl.f_literal_width + 1);
    } else if (v_code <= v_save_code) {
      v_c = v_code;
      if (v_code == v_save_code) {
        v_c = v_prev_code;
      }
      v_o = ((v_output_wi +
              (((uint32_t)(self->private_data.f_lm1s[v_c])) & 4294967288)) &
             8191);
      v_output_wi =
          ((v_output_wi + 1 + ((uint32_t)(self->private_data.f_lm1s[v_c]))) &
           8191);
      v_steps = (((uint32_t)(self->private_data.f_lm1s[v_c])) >> 3);
      while (true) {
        memcpy((self->private_data.f_output) + (v_o),
               (self->private_data.f_suffixes[v_c]), 8);
        if (v_steps <= 0) {
          goto label_1_break;
        }
        v_steps -= 1;
        v_o = ((v_o - 8) & 8191);
        v_c = ((uint32_t)(self->private_impl.f_prefixes[v_c]));
      }
    label_1_break:;
      v_first_byte = self->private_data.f_suffixes[v_c][0];
      if (v_code == v_save_code) {
        self->private_data.f_output[v_output_wi] = v_first_byte;
        v_output_wi = ((v_output_wi + 1) & 8191);
      }
      if (v_save_code <= 4095) {
        v_lm1_b = ((self->private_data.f_lm1s[v_prev_code] + 1) & 4095);
        self->private_data.f_lm1s[v_save_code] = v_lm1_b;
        if ((v_lm1_b % 8) != 0) {
          self->private_impl.f_prefixes[v_save_code] =
              self->private_impl.f_prefixes[v_prev_code];
          memcpy(self->private_data.f_suffixes[v_save_code],
                 self->private_data.f_suffixes[v_prev_code],
                 sizeof(self->private_data.f_suffixes[v_save_code]));
          self->private_data.f_suffixes[v_save_code][(v_lm1_b % 8)] =
              v_first_byte;
        } else {
          self->private_impl.f_prefixes[v_save_code] =
              ((uint16_t)(v_prev_code));
          self->private_data.f_suffixes[v_save_code][0] =
              ((uint8_t)(v_first_byte));
        }
        v_save_code += 1;
        if (v_width < 12) {
          v_width += (1 & (v_save_code >> v_width));
        }
        v_prev_code = v_code;
      }
    } else {
      self->private_impl.f_read_from_return_value = 3;
      goto label_0_break;
    }
    if (v_output_wi > 4095) {
      self->private_impl.f_read_from_return_value = 1;
      goto label_0_break;
    }
  }
label_0_break:;
  if (self->private_impl.f_read_from_return_value != 2) {
    while (v_n_bits >= 8) {
      v_n_bits -= 8;
      if (iop_a_src > io1_a_src) {
        (iop_a_src--, wuffs_base__make_empty_struct());
      } else {
        self->private_impl.f_read_from_return_value = 4;
        goto label_2_break;
      }
    }
  label_2_break:;
  }
  self->private_impl.f_save_code = v_save_code;
  self->private_impl.f_prev_code = v_prev_code;
  self->private_impl.f_width = v_width;
  self->private_impl.f_bits = v_bits;
  self->private_impl.f_n_bits = v_n_bits;
  self->private_impl.f_output_wi = v_output_wi;
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return wuffs_base__make_empty_struct();
}

// -------- func lzw.decoder.write_to

static wuffs_base__status  //
wuffs_lzw__decoder__write_to(wuffs_lzw__decoder* self,
                             wuffs_base__io_buffer* a_dst) {
  wuffs_base__status status = NULL;

  wuffs_base__slice_u8 v_s = {0};
  uint64_t v_n = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }

  uint32_t coro_susp_point = self->private_impl.p_write_to[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (self->private_impl.f_output_wi > 0) {
      if (self->private_impl.f_output_ri > self->private_impl.f_output_wi) {
        status = wuffs_lzw__error__internal_error_inconsistent_i_o;
        goto exit;
      }
      v_s = wuffs_base__slice_u8__subslice_ij(
          wuffs_base__make_slice_u8(self->private_data.f_output, 8199),
          self->private_impl.f_output_ri, self->private_impl.f_output_wi);
      v_n = wuffs_base__io_writer__copy_from_slice(&iop_a_dst, io2_a_dst, v_s);
      if (v_n == ((uint64_t)(v_s.len))) {
        self->private_impl.f_output_ri = 0;
        self->private_impl.f_output_wi = 0;
        status = NULL;
        goto ok;
      }
      self->private_impl.f_output_ri =
          ((self->private_impl.f_output_ri + ((uint32_t)((v_n & 4294967295)))) &
           8191);
      status = wuffs_base__suspension__short_write;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
    }

    goto ok;
  ok:
    self->private_impl.p_write_to[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_write_to[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;

  goto exit;
exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }

  return status;
}

// -------- func lzw.decoder.flush

WUFFS_BASE__MAYBE_STATIC wuffs_base__slice_u8  //
wuffs_lzw__decoder__flush(wuffs_lzw__decoder* self) {
  if (!self) {
    return wuffs_base__make_slice_u8(NULL, 0);
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_slice_u8(NULL, 0);
  }

  wuffs_base__slice_u8 v_s = {0};

  if (self->private_impl.f_output_ri <= self->private_impl.f_output_wi) {
    v_s = wuffs_base__slice_u8__subslice_ij(
        wuffs_base__make_slice_u8(self->private_data.f_output, 8199),
        self->private_impl.f_output_ri, self->private_impl.f_output_wi);
  }
  self->private_impl.f_output_ri = 0;
  self->private_impl.f_output_wi = 0;
  return v_s;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__LZW)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GIF)

// ---------------- Status Codes Implementations

const char* wuffs_gif__error__bad_block = "#gif: bad block";
const char* wuffs_gif__error__bad_extension_label = "#gif: bad extension label";
const char* wuffs_gif__error__bad_frame_size = "#gif: bad frame size";
const char* wuffs_gif__error__bad_graphic_control = "#gif: bad graphic control";
const char* wuffs_gif__error__bad_header = "#gif: bad header";
const char* wuffs_gif__error__bad_literal_width = "#gif: bad literal width";
const char* wuffs_gif__error__bad_palette = "#gif: bad palette";
const char* wuffs_gif__error__internal_error_inconsistent_ri_wi =
    "#gif: internal error: inconsistent ri/wi";

// ---------------- Private Consts

static const uint32_t              //
    wuffs_gif__interlace_start[5]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        4294967295, 1, 2, 4, 0,
};

static const uint8_t               //
    wuffs_gif__interlace_delta[5]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        1, 2, 4, 8, 8,
};

static const uint8_t               //
    wuffs_gif__interlace_count[5]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        0, 1, 2, 4, 8,
};

static const uint8_t              //
    wuffs_gif__animexts1dot0[11]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        65, 78, 73, 77, 69, 88, 84, 83, 49, 46, 48,
};

static const uint8_t              //
    wuffs_gif__netscape2dot0[11]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        78, 69, 84, 83, 67, 65, 80, 69, 50, 46, 48,
};

static const uint8_t            //
    wuffs_gif__iccrgbg1012[11]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        73, 67, 67, 82, 71, 66, 71, 49, 48, 49, 50,
};

static const uint8_t           //
    wuffs_gif__xmpdataxmp[11]  //
    WUFFS_BASE__POTENTIALLY_UNUSED = {
        88, 77, 80, 32, 68, 97, 116, 97, 88, 77, 80,
};

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

static wuffs_base__status  //
wuffs_gif__decoder__skip_frame(wuffs_gif__decoder* self,
                               wuffs_base__io_buffer* a_src);

static wuffs_base__empty_struct  //
wuffs_gif__decoder__reset_gc(wuffs_gif__decoder* self);

static wuffs_base__status  //
wuffs_gif__decoder__decode_up_to_id_part1(wuffs_gif__decoder* self,
                                          wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_header(wuffs_gif__decoder* self,
                                  wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_lsd(wuffs_gif__decoder* self,
                               wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_extension(wuffs_gif__decoder* self,
                                     wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__decoder__skip_blocks(wuffs_gif__decoder* self,
                                wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_ae(wuffs_gif__decoder* self,
                              wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_gc(wuffs_gif__decoder* self,
                              wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_id_part0(wuffs_gif__decoder* self,
                                    wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_id_part1(wuffs_gif__decoder* self,
                                    wuffs_base__pixel_buffer* a_dst,
                                    wuffs_base__io_buffer* a_src);

static wuffs_base__status  //
wuffs_gif__decoder__decode_id_part2(wuffs_gif__decoder* self,
                                    wuffs_base__pixel_buffer* a_dst,
                                    wuffs_base__io_buffer* a_src,
                                    wuffs_base__slice_u8 a_workbuf);

static wuffs_base__status  //
wuffs_gif__decoder__copy_to_image_buffer(wuffs_gif__decoder* self,
                                         wuffs_base__pixel_buffer* a_pb,
                                         wuffs_base__slice_u8 a_src);

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_gif__decoder__initialize(wuffs_gif__decoder* self,
                               size_t sizeof_star_self,
                               uint64_t wuffs_version,
                               uint32_t initialize_flags) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__error__bad_sizeof_receiver;
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__error__bad_wuffs_version;
  }

  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
// The whole point of this if-check is to detect an uninitialized *self.
// We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  {
    wuffs_base__status z = wuffs_lzw__decoder__initialize(
        &self->private_data.f_lzw, sizeof(self->private_data.f_lzw),
        WUFFS_VERSION, initialize_flags);
    if (z) {
      return z;
    }
  }
  self->private_impl.magic = WUFFS_BASE__MAGIC;
  return NULL;
}

size_t  //
sizeof__wuffs_gif__decoder() {
  return sizeof(wuffs_gif__decoder);
}

// ---------------- Function Implementations

// -------- func gif.decoder.set_quirk_enabled

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gif__decoder__set_quirk_enabled(wuffs_gif__decoder* self,
                                      uint32_t a_quirk,
                                      bool a_enabled) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if (self->private_impl.f_call_sequence == 0) {
    if (a_quirk == 1041635328) {
      self->private_impl.f_quirk_enabled_delay_num_decoded_frames = a_enabled;
    } else if (a_quirk == 1041635329) {
      self->private_impl
          .f_quirk_enabled_first_frame_local_palette_means_black_background =
          a_enabled;
    } else if (a_quirk == 1041635330) {
      self->private_impl.f_quirk_enabled_honor_background_color = a_enabled;
    } else if (a_quirk == 1041635331) {
      self->private_impl.f_quirk_enabled_ignore_too_much_pixel_data = a_enabled;
    } else if (a_quirk == 1041635332) {
      self->private_impl.f_quirk_enabled_image_bounds_are_strict = a_enabled;
    } else if (a_quirk == 1041635333) {
      self->private_impl.f_quirk_enabled_reject_empty_frame = a_enabled;
    } else if (a_quirk == 1041635334) {
      self->private_impl.f_quirk_enabled_reject_empty_palette = a_enabled;
    }
  }
  return wuffs_base__make_empty_struct();
}

// -------- func gif.decoder.decode_image_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__decode_image_config(wuffs_gif__decoder* self,
                                        wuffs_base__image_config* a_dst,
                                        wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
               ? wuffs_base__error__disabled_by_previous_error
               : wuffs_base__error__initialize_not_called;
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__bad_argument;
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__interleaved_coroutine_calls;
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = NULL;

  bool v_ffio = false;

  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence == 0) {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_gif__decoder__decode_header(self, a_src);
      if (status) {
        goto suspend;
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      status = wuffs_gif__decoder__decode_lsd(self, a_src);
      if (status) {
        goto suspend;
      }
    } else if (self->private_impl.f_call_sequence != 2) {
      status = wuffs_base__error__bad_call_sequence;
      goto exit;
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
    status = wuffs_gif__decoder__decode_up_to_id_part1(self, a_src);
    if (status) {
      goto suspend;
    }
    v_ffio = !self->private_impl.f_gc_has_transparent_index;
    if (!self->private_impl.f_quirk_enabled_honor_background_color) {
      v_ffio =
          (v_ffio && (self->private_impl.f_frame_rect_x0 == 0) &&
           (self->private_impl.f_frame_rect_y0 == 0) &&
           (self->private_impl.f_frame_rect_x1 == self->private_impl.f_width) &&
           (self->private_impl.f_frame_rect_y1 == self->private_impl.f_height));
    } else if (v_ffio) {
      self->private_impl.f_black_color_u32_argb_premul = 4278190080;
    }
    if (self->private_impl.f_background_color_u32_argb_premul == 77) {
      self->private_impl.f_background_color_u32_argb_premul =
          self->private_impl.f_black_color_u32_argb_premul;
    }
    if (a_dst != NULL) {
      wuffs_base__image_config__set(
          a_dst, 1191444488, 0, self->private_impl.f_width,
          self->private_impl.f_height,
          self->private_impl.f_frame_config_io_position, v_ffio);
    }
    self->private_impl.f_call_sequence = 3;

    goto ok;
  ok:
    self->private_impl.p_decode_image_config[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_image_config[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine =
      wuffs_base__status__is_suspension(status) ? 1 : 0;

  goto exit;
exit:
  if (wuffs_base__status__is_error(status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func gif.decoder.set_report_metadata

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gif__decoder__set_report_metadata(wuffs_gif__decoder* self,
                                        uint32_t a_fourcc,
                                        bool a_report) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if (a_fourcc == 1229144912) {
    self->private_impl.f_report_metadata_iccp = a_report;
  } else if (a_fourcc == 1481461792) {
    self->private_impl.f_report_metadata_xmp = a_report;
  }
  return wuffs_base__make_empty_struct();
}

// -------- func gif.decoder.ack_metadata_chunk

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__ack_metadata_chunk(wuffs_gif__decoder* self,
                                       wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
               ? wuffs_base__error__disabled_by_previous_error
               : wuffs_base__error__initialize_not_called;
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__bad_argument;
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 2)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__interleaved_coroutine_calls;
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = NULL;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_ack_metadata_chunk[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_call_sequence != 1) {
      status = wuffs_base__error__bad_call_sequence;
      goto exit;
    }
    if (wuffs_base__u64__sat_add(a_src->meta.pos,
                                 ((uint64_t)(iop_a_src - io0_a_src))) !=
        self->private_impl.f_metadata_io_position) {
      status = wuffs_base__error__bad_i_o_position;
      goto exit;
    }
    if (self->private_impl.f_metadata_chunk_length_value > 0) {
      while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
        status = wuffs_base__suspension__short_read;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
      }
      self->private_impl.f_metadata_chunk_length_value =
          ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
      if (self->private_impl.f_metadata_chunk_length_value > 0) {
        if (self->private_impl.f_metadata_fourcc_value == 1481461792) {
          self->private_impl.f_metadata_chunk_length_value += 1;
        } else {
          (iop_a_src += 1, wuffs_base__make_empty_struct());
        }
        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(
            wuffs_base__u64__sat_add(a_src->meta.pos,
                                     ((uint64_t)(iop_a_src - io0_a_src))),
            self->private_impl.f_metadata_chunk_length_value);
        status = wuffs_base__warning__metadata_reported;
        goto ok;
      }
      (iop_a_src += 1, wuffs_base__make_empty_struct());
    }
    self->private_impl.f_call_sequence = 2;
    self->private_impl.f_metadata_fourcc_value = 0;
    self->private_impl.f_metadata_io_position = 0;
    status = NULL;
    goto ok;
    goto ok;
  ok:
    self->private_impl.p_ack_metadata_chunk[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_ack_metadata_chunk[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine =
      wuffs_base__status__is_suspension(status) ? 2 : 0;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func gif.decoder.metadata_fourcc

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_gif__decoder__metadata_fourcc(const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_metadata_fourcc_value;
}

// -------- func gif.decoder.metadata_chunk_length

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__metadata_chunk_length(const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_metadata_chunk_length_value;
}

// -------- func gif.decoder.num_animation_loops

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_gif__decoder__num_animation_loops(const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  if (self->private_impl.f_seen_num_loops) {
    return self->private_impl.f_num_loops;
  }
  return 1;
}

// -------- func gif.decoder.num_decoded_frame_configs

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__num_decoded_frame_configs(const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_num_decoded_frame_configs_value;
}

// -------- func gif.decoder.num_decoded_frames

WUFFS_BASE__MAYBE_STATIC uint64_t  //
wuffs_gif__decoder__num_decoded_frames(const wuffs_gif__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_num_decoded_frames_value;
}

// -------- func gif.decoder.frame_dirty_rect

WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32  //
wuffs_gif__decoder__frame_dirty_rect(const wuffs_gif__decoder* self) {
  if (!self) {
    return wuffs_base__utility__make_rect_ie_u32(0, 0, 0, 0);
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__make_rect_ie_u32(0, 0, 0, 0);
  }

  return wuffs_base__utility__make_rect_ie_u32(
      wuffs_base__u32__min(self->private_impl.f_frame_rect_x0,
                           self->private_impl.f_width),
      wuffs_base__u32__min(self->private_impl.f_frame_rect_y0,
                           self->private_impl.f_height),
      wuffs_base__u32__min(self->private_impl.f_frame_rect_x1,
                           self->private_impl.f_width),
      wuffs_base__u32__min(self->private_impl.f_dirty_max_excl_y,
                           self->private_impl.f_height));
}

// -------- func gif.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_gif__decoder__workbuf_len(const wuffs_gif__decoder* self) {
  if (!self) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }

  return wuffs_base__utility__make_range_ii_u64(1, 1);
}

// -------- func gif.decoder.restart_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__restart_frame(wuffs_gif__decoder* self,
                                  uint64_t a_index,
                                  uint64_t a_io_position) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
               ? wuffs_base__error__disabled_by_previous_error
               : wuffs_base__error__initialize_not_called;
  }

  if (self->private_impl.f_call_sequence == 0) {
    return wuffs_base__error__bad_call_sequence;
  }
  self->private_impl.f_delayed_num_decoded_frames = false;
  self->private_impl.f_end_of_data = false;
  self->private_impl.f_restarted = true;
  self->private_impl.f_frame_config_io_position = a_io_position;
  self->private_impl.f_num_decoded_frame_configs_value = a_index;
  self->private_impl.f_num_decoded_frames_value = a_index;
  wuffs_gif__decoder__reset_gc(self);
  return NULL;
}

// -------- func gif.decoder.decode_frame_config

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__decode_frame_config(wuffs_gif__decoder* self,
                                        wuffs_base__frame_config* a_dst,
                                        wuffs_base__io_buffer* a_src) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
               ? wuffs_base__error__disabled_by_previous_error
               : wuffs_base__error__initialize_not_called;
  }
  if (!a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__bad_argument;
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 3)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__interleaved_coroutine_calls;
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = NULL;

  uint8_t v_blend = 0;
  uint32_t v_background_color = 0;
  uint8_t v_flags = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
  if (coro_susp_point) {
    v_blend = self->private_data.s_decode_frame_config[0].v_blend;
    v_background_color =
        self->private_data.s_decode_frame_config[0].v_background_color;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_impl.f_ignore_metadata = true;
    self->private_impl.f_dirty_max_excl_y = 0;
    if (!self->private_impl.f_end_of_data) {
      if (self->private_impl.f_call_sequence == 0) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        status = wuffs_gif__decoder__decode_image_config(self, NULL, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status) {
          goto suspend;
        }
      } else if (self->private_impl.f_call_sequence != 3) {
        if (self->private_impl.f_call_sequence == 4) {
          if (a_src) {
            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
          }
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          status = wuffs_gif__decoder__skip_frame(self, a_src);
          if (a_src) {
            iop_a_src = a_src->data.ptr + a_src->meta.ri;
          }
          if (status) {
            goto suspend;
          }
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
        status = wuffs_gif__decoder__decode_up_to_id_part1(self, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status) {
          goto suspend;
        }
      }
    }
    if (self->private_impl.f_end_of_data) {
      status = wuffs_base__warning__end_of_data;
      goto ok;
    }
    v_blend = 0;
    v_background_color = self->private_impl.f_black_color_u32_argb_premul;
    if (!self->private_impl.f_gc_has_transparent_index) {
      v_blend = 2;
      v_background_color =
          self->private_impl.f_background_color_u32_argb_premul;
      if (self->private_impl
              .f_quirk_enabled_first_frame_local_palette_means_black_background &&
          (self->private_impl.f_num_decoded_frame_configs_value == 0)) {
        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          status = wuffs_base__suspension__short_read;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
        }
        v_flags = wuffs_base__load_u8be(iop_a_src);
        if ((v_flags & 128) != 0) {
          v_background_color = self->private_impl.f_black_color_u32_argb_premul;
        }
      }
    }
    if (a_dst != NULL) {
      wuffs_base__frame_config__update(
          a_dst,
          wuffs_base__utility__make_rect_ie_u32(
              wuffs_base__u32__min(self->private_impl.f_frame_rect_x0,
                                   self->private_impl.f_width),
              wuffs_base__u32__min(self->private_impl.f_frame_rect_y0,
                                   self->private_impl.f_height),
              wuffs_base__u32__min(self->private_impl.f_frame_rect_x1,
                                   self->private_impl.f_width),
              wuffs_base__u32__min(self->private_impl.f_frame_rect_y1,
                                   self->private_impl.f_height)),
          ((wuffs_base__flicks)(self->private_impl.f_gc_duration)),
          self->private_impl.f_num_decoded_frame_configs_value,
          self->private_impl.f_frame_config_io_position, v_blend,
          self->private_impl.f_gc_disposal, v_background_color);
    }
    wuffs_base__u64__sat_add_indirect(
        &self->private_impl.f_num_decoded_frame_configs_value, 1);
    self->private_impl.f_call_sequence = 4;

    goto ok;
  ok:
    self->private_impl.p_decode_frame_config[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_frame_config[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine =
      wuffs_base__status__is_suspension(status) ? 3 : 0;
  self->private_data.s_decode_frame_config[0].v_blend = v_blend;
  self->private_data.s_decode_frame_config[0].v_background_color =
      v_background_color;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func gif.decoder.skip_frame

static wuffs_base__status  //
wuffs_gif__decoder__skip_frame(wuffs_gif__decoder* self,
                               wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_flags = 0;
  uint8_t v_lw = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_skip_frame[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_flags = t_0;
    }
    if ((v_flags & 128) != 0) {
      self->private_data.s_skip_frame[0].scratch =
          (((uint32_t)(3)) << (1 + (v_flags & 7)));
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      if (self->private_data.s_skip_frame[0].scratch >
          ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_skip_frame[0].scratch -=
            ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      iop_a_src += self->private_data.s_skip_frame[0].scratch;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_1 = *iop_a_src++;
      v_lw = t_1;
    }
    if (v_lw > 8) {
      status = wuffs_gif__error__bad_literal_width;
      goto exit;
    }
    if (a_src) {
      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
    status = wuffs_gif__decoder__skip_blocks(self, a_src);
    if (a_src) {
      iop_a_src = a_src->data.ptr + a_src->meta.ri;
    }
    if (status) {
      goto suspend;
    }
    if (self->private_impl.f_quirk_enabled_delay_num_decoded_frames) {
      self->private_impl.f_delayed_num_decoded_frames = true;
    } else {
      wuffs_base__u64__sat_add_indirect(
          &self->private_impl.f_num_decoded_frames_value, 1);
    }
    wuffs_gif__decoder__reset_gc(self);

    goto ok;
  ok:
    self->private_impl.p_skip_frame[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_skip_frame[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_frame

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gif__decoder__decode_frame(wuffs_gif__decoder* self,
                                 wuffs_base__pixel_buffer* a_dst,
                                 wuffs_base__io_buffer* a_src,
                                 wuffs_base__slice_u8 a_workbuf,
                                 wuffs_base__decode_frame_options* a_opts) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
               ? wuffs_base__error__disabled_by_previous_error
               : wuffs_base__error__initialize_not_called;
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__bad_argument;
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 4)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__interleaved_coroutine_calls;
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = NULL;

  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    self->private_impl.f_ignore_metadata = true;
    if (self->private_impl.f_call_sequence != 4) {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      status = wuffs_gif__decoder__decode_frame_config(self, NULL, a_src);
      if (status) {
        goto suspend;
      }
    }
    if (self->private_impl.f_quirk_enabled_reject_empty_frame &&
        ((self->private_impl.f_frame_rect_x0 ==
          self->private_impl.f_frame_rect_x1) ||
         (self->private_impl.f_frame_rect_y0 ==
          self->private_impl.f_frame_rect_y1))) {
      status = wuffs_gif__error__bad_frame_size;
      goto exit;
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
    status = wuffs_gif__decoder__decode_id_part1(self, a_dst, a_src);
    if (status) {
      goto suspend;
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
    status = wuffs_gif__decoder__decode_id_part2(self, a_dst, a_src, a_workbuf);
    if (status) {
      goto suspend;
    }
    wuffs_base__u64__sat_add_indirect(
        &self->private_impl.f_num_decoded_frames_value, 1);
    wuffs_gif__decoder__reset_gc(self);

    goto ok;
  ok:
    self->private_impl.p_decode_frame[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_frame[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine =
      wuffs_base__status__is_suspension(status) ? 4 : 0;

  goto exit;
exit:
  if (wuffs_base__status__is_error(status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

// -------- func gif.decoder.reset_gc

static wuffs_base__empty_struct  //
wuffs_gif__decoder__reset_gc(wuffs_gif__decoder* self) {
  self->private_impl.f_call_sequence = 5;
  self->private_impl.f_gc_has_transparent_index = false;
  self->private_impl.f_gc_transparent_index = 0;
  self->private_impl.f_gc_disposal = 0;
  self->private_impl.f_gc_duration = 0;
  return wuffs_base__make_empty_struct();
}

// -------- func gif.decoder.decode_up_to_id_part1

static wuffs_base__status  //
wuffs_gif__decoder__decode_up_to_id_part1(wuffs_gif__decoder* self,
                                          wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_block_type = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_up_to_id_part1[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (!self->private_impl.f_restarted) {
      if (self->private_impl.f_call_sequence != 2) {
        self->private_impl.f_frame_config_io_position =
            wuffs_base__u64__sat_add(a_src->meta.pos,
                                     ((uint64_t)(iop_a_src - io0_a_src)));
      }
    } else if (self->private_impl.f_frame_config_io_position !=
               wuffs_base__u64__sat_add(a_src->meta.pos,
                                        ((uint64_t)(iop_a_src - io0_a_src)))) {
      status = wuffs_base__error__bad_restart;
      goto exit;
    } else {
      self->private_impl.f_restarted = false;
    }
    while (true) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__suspension__short_read;
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        v_block_type = t_0;
      }
      if (v_block_type == 33) {
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        status = wuffs_gif__decoder__decode_extension(self, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status) {
          goto suspend;
        }
      } else if (v_block_type == 44) {
        if (self->private_impl.f_delayed_num_decoded_frames) {
          self->private_impl.f_delayed_num_decoded_frames = false;
          wuffs_base__u64__sat_add_indirect(
              &self->private_impl.f_num_decoded_frames_value, 1);
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
        status = wuffs_gif__decoder__decode_id_part0(self, a_src);
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        if (status) {
          goto suspend;
        }
        goto label_0_break;
      } else if (v_block_type == 59) {
        if (self->private_impl.f_delayed_num_decoded_frames) {
          self->private_impl.f_delayed_num_decoded_frames = false;
          wuffs_base__u64__sat_add_indirect(
              &self->private_impl.f_num_decoded_frames_value, 1);
        }
        self->private_impl.f_end_of_data = true;
        goto label_0_break;
      } else {
        status = wuffs_gif__error__bad_block;
        goto exit;
      }
    }
  label_0_break:;

    goto ok;
  ok:
    self->private_impl.p_decode_up_to_id_part1[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_up_to_id_part1[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_header

static wuffs_base__status  //
wuffs_gif__decoder__decode_header(wuffs_gif__decoder* self,
                                  wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_c[6] = {0};
  uint32_t v_i = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_header[0];
  if (coro_susp_point) {
    memcpy(v_c, self->private_data.s_decode_header[0].v_c, sizeof(v_c));
    v_i = self->private_data.s_decode_header[0].v_i;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (v_i < 6) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__suspension__short_read;
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        v_c[v_i] = t_0;
      }
      v_i += 1;
    }
    if ((v_c[0] != 71) || (v_c[1] != 73) || (v_c[2] != 70) || (v_c[3] != 56) ||
        ((v_c[4] != 55) && (v_c[4] != 57)) || (v_c[5] != 97)) {
      status = wuffs_gif__error__bad_header;
      goto exit;
    }

    goto ok;
  ok:
    self->private_impl.p_decode_header[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_header[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  memcpy(self->private_data.s_decode_header[0].v_c, v_c, sizeof(v_c));
  self->private_data.s_decode_header[0].v_i = v_i;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_lsd

static wuffs_base__status  //
wuffs_gif__decoder__decode_lsd(wuffs_gif__decoder* self,
                               wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_flags = 0;
  uint8_t v_background_color_index = 0;
  uint32_t v_num_palette_entries = 0;
  uint32_t v_i = 0;
  uint32_t v_j = 0;
  uint32_t v_argb = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_lsd[0];
  if (coro_susp_point) {
    v_flags = self->private_data.s_decode_lsd[0].v_flags;
    v_background_color_index =
        self->private_data.s_decode_lsd[0].v_background_color_index;
    v_num_palette_entries =
        self->private_data.s_decode_lsd[0].v_num_palette_entries;
    v_i = self->private_data.s_decode_lsd[0].v_i;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint32_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_0 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_lsd[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
          if (num_bits_0 == 8) {
            t_0 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0)) << 56;
        }
      }
      self->private_impl.f_width = t_0;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      uint32_t t_1;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_1 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_lsd[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
          if (num_bits_1 == 8) {
            t_1 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_1 += 8;
          *scratch |= ((uint64_t)(num_bits_1)) << 56;
        }
      }
      self->private_impl.f_height = t_1;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_2 = *iop_a_src++;
      v_flags = t_2;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_3 = *iop_a_src++;
      v_background_color_index = t_3;
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
    if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
      status = wuffs_base__suspension__short_read;
      goto suspend;
    }
    iop_a_src++;
    v_i = 0;
    self->private_impl.f_has_global_palette = ((v_flags & 128) != 0);
    if (self->private_impl.f_has_global_palette) {
      v_num_palette_entries = (((uint32_t)(1)) << (1 + (v_flags & 7)));
      while (v_i < v_num_palette_entries) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
          uint32_t t_4;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
            t_4 = ((uint32_t)(wuffs_base__load_u24be(iop_a_src)));
            iop_a_src += 3;
          } else {
            self->private_data.s_decode_lsd[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__suspension__short_read;
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
              uint32_t num_bits_4 = ((uint32_t)(*scratch & 0xFF));
              *scratch >>= 8;
              *scratch <<= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_4);
              if (num_bits_4 == 16) {
                t_4 = ((uint32_t)(*scratch >> 40));
                break;
              }
              num_bits_4 += 8;
              *scratch |= ((uint64_t)(num_bits_4));
            }
          }
          v_argb = t_4;
        }
        v_argb |= 4278190080;
        self->private_data.f_palettes[0][((4 * v_i) + 0)] =
            ((uint8_t)(((v_argb >> 0) & 255)));
        self->private_data.f_palettes[0][((4 * v_i) + 1)] =
            ((uint8_t)(((v_argb >> 8) & 255)));
        self->private_data.f_palettes[0][((4 * v_i) + 2)] =
            ((uint8_t)(((v_argb >> 16) & 255)));
        self->private_data.f_palettes[0][((4 * v_i) + 3)] =
            ((uint8_t)(((v_argb >> 24) & 255)));
        v_i += 1;
      }
      if (self->private_impl.f_quirk_enabled_honor_background_color) {
        if ((v_background_color_index != 0) &&
            (((uint32_t)(v_background_color_index)) < v_num_palette_entries)) {
          v_j = (4 * ((uint32_t)(v_background_color_index)));
          self->private_impl.f_background_color_u32_argb_premul =
              ((((uint32_t)(self->private_data.f_palettes[0][(v_j + 0)]))
                << 0) |
               (((uint32_t)(self->private_data.f_palettes[0][(v_j + 1)]))
                << 8) |
               (((uint32_t)(self->private_data.f_palettes[0][(v_j + 2)]))
                << 16) |
               (((uint32_t)(self->private_data.f_palettes[0][(v_j + 3)]))
                << 24));
        } else {
          self->private_impl.f_background_color_u32_argb_premul = 77;
        }
      }
    }
    while (v_i < 256) {
      self->private_data.f_palettes[0][((4 * v_i) + 0)] = 0;
      self->private_data.f_palettes[0][((4 * v_i) + 1)] = 0;
      self->private_data.f_palettes[0][((4 * v_i) + 2)] = 0;
      self->private_data.f_palettes[0][((4 * v_i) + 3)] = 255;
      v_i += 1;
    }

    goto ok;
  ok:
    self->private_impl.p_decode_lsd[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_lsd[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_data.s_decode_lsd[0].v_flags = v_flags;
  self->private_data.s_decode_lsd[0].v_background_color_index =
      v_background_color_index;
  self->private_data.s_decode_lsd[0].v_num_palette_entries =
      v_num_palette_entries;
  self->private_data.s_decode_lsd[0].v_i = v_i;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_extension

static wuffs_base__status  //
wuffs_gif__decoder__decode_extension(wuffs_gif__decoder* self,
                                     wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_label = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_extension[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_label = t_0;
    }
    if (v_label == 249) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      status = wuffs_gif__decoder__decode_gc(self, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status) {
        goto suspend;
      }
      status = NULL;
      goto ok;
    } else if (v_label == 255) {
      if (a_src) {
        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
      }
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      status = wuffs_gif__decoder__decode_ae(self, a_src);
      if (a_src) {
        iop_a_src = a_src->data.ptr + a_src->meta.ri;
      }
      if (status) {
        goto suspend;
      }
      status = NULL;
      goto ok;
    }
    if (a_src) {
      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
    status = wuffs_gif__decoder__skip_blocks(self, a_src);
    if (a_src) {
      iop_a_src = a_src->data.ptr + a_src->meta.ri;
    }
    if (status) {
      goto suspend;
    }

    goto ok;
  ok:
    self->private_impl.p_decode_extension[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_extension[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.skip_blocks

static wuffs_base__status  //
wuffs_gif__decoder__skip_blocks(wuffs_gif__decoder* self,
                                wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_block_size = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_skip_blocks[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (true) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__suspension__short_read;
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        v_block_size = t_0;
      }
      if (v_block_size == 0) {
        status = NULL;
        goto ok;
      }
      self->private_data.s_skip_blocks[0].scratch = ((uint32_t)(v_block_size));
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      if (self->private_data.s_skip_blocks[0].scratch >
          ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_skip_blocks[0].scratch -=
            ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      iop_a_src += self->private_data.s_skip_blocks[0].scratch;
    }

    goto ok;
  ok:
    self->private_impl.p_skip_blocks[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_skip_blocks[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_ae

static wuffs_base__status  //
wuffs_gif__decoder__decode_ae(wuffs_gif__decoder* self,
                              wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_c = 0;
  uint8_t v_block_size = 0;
  bool v_is_animexts = false;
  bool v_is_netscape = false;
  bool v_is_iccp = false;
  bool v_is_xmp = false;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_ae[0];
  if (coro_susp_point) {
    v_block_size = self->private_data.s_decode_ae[0].v_block_size;
    v_is_animexts = self->private_data.s_decode_ae[0].v_is_animexts;
    v_is_netscape = self->private_data.s_decode_ae[0].v_is_netscape;
    v_is_iccp = self->private_data.s_decode_ae[0].v_is_iccp;
    v_is_xmp = self->private_data.s_decode_ae[0].v_is_xmp;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    while (true) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
          status = wuffs_base__suspension__short_read;
          goto suspend;
        }
        uint8_t t_0 = *iop_a_src++;
        v_block_size = t_0;
      }
      if (v_block_size == 0) {
        status = NULL;
        goto ok;
      }
      if (v_block_size != 11) {
        self->private_data.s_decode_ae[0].scratch = ((uint32_t)(v_block_size));
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        if (self->private_data.s_decode_ae[0].scratch >
            ((uint64_t)(io2_a_src - iop_a_src))) {
          self->private_data.s_decode_ae[0].scratch -=
              ((uint64_t)(io2_a_src - iop_a_src));
          iop_a_src = io2_a_src;
          status = wuffs_base__suspension__short_read;
          goto suspend;
        }
        iop_a_src += self->private_data.s_decode_ae[0].scratch;
        goto label_0_break;
      }
      v_is_animexts = true;
      v_is_netscape = true;
      v_is_iccp = true;
      v_is_xmp = true;
      v_block_size = 0;
      while (v_block_size < 11) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint8_t t_1 = *iop_a_src++;
          v_c = t_1;
        }
        v_is_animexts =
            (v_is_animexts && (v_c == wuffs_gif__animexts1dot0[v_block_size]));
        v_is_netscape =
            (v_is_netscape && (v_c == wuffs_gif__netscape2dot0[v_block_size]));
        v_is_iccp =
            (v_is_iccp && (v_c == wuffs_gif__iccrgbg1012[v_block_size]));
        v_is_xmp = (v_is_xmp && (v_c == wuffs_gif__xmpdataxmp[v_block_size]));
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
        v_block_size += 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
      }
      if (v_is_animexts || v_is_netscape) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint8_t t_2 = *iop_a_src++;
          v_block_size = t_2;
        }
        if (v_block_size != 3) {
          self->private_data.s_decode_ae[0].scratch =
              ((uint32_t)(v_block_size));
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
          if (self->private_data.s_decode_ae[0].scratch >
              ((uint64_t)(io2_a_src - iop_a_src))) {
            self->private_data.s_decode_ae[0].scratch -=
                ((uint64_t)(io2_a_src - iop_a_src));
            iop_a_src = io2_a_src;
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          iop_a_src += self->private_data.s_decode_ae[0].scratch;
          goto label_0_break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint8_t t_3 = *iop_a_src++;
          v_c = t_3;
        }
        if (v_c != 1) {
          self->private_data.s_decode_ae[0].scratch = 2;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
          if (self->private_data.s_decode_ae[0].scratch >
              ((uint64_t)(io2_a_src - iop_a_src))) {
            self->private_data.s_decode_ae[0].scratch -=
                ((uint64_t)(io2_a_src - iop_a_src));
            iop_a_src = io2_a_src;
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          iop_a_src += self->private_data.s_decode_ae[0].scratch;
          goto label_0_break;
        }
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
          uint32_t t_4;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
            t_4 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
            iop_a_src += 2;
          } else {
            self->private_data.s_decode_ae[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__suspension__short_read;
                goto suspend;
              }
              uint64_t* scratch = &self->private_data.s_decode_ae[0].scratch;
              uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
              *scratch <<= 8;
              *scratch >>= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
              if (num_bits_4 == 8) {
                t_4 = ((uint32_t)(*scratch));
                break;
              }
              num_bits_4 += 8;
              *scratch |= ((uint64_t)(num_bits_4)) << 56;
            }
          }
          self->private_impl.f_num_loops = t_4;
        }
        self->private_impl.f_seen_num_loops = true;
        if ((0 < self->private_impl.f_num_loops) &&
            (self->private_impl.f_num_loops <= 65535)) {
          self->private_impl.f_num_loops += 1;
        }
      } else if (self->private_impl.f_ignore_metadata) {
      } else if (v_is_iccp && self->private_impl.f_report_metadata_iccp) {
        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          status = wuffs_base__suspension__short_read;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
        }
        self->private_impl.f_metadata_chunk_length_value =
            ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
        (iop_a_src += 1, wuffs_base__make_empty_struct());
        self->private_impl.f_metadata_fourcc_value = 1229144912;
        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(
            wuffs_base__u64__sat_add(a_src->meta.pos,
                                     ((uint64_t)(iop_a_src - io0_a_src))),
            self->private_impl.f_metadata_chunk_length_value);
        self->private_impl.f_call_sequence = 1;
        status = wuffs_base__warning__metadata_reported;
        goto ok;
      } else if (v_is_xmp && self->private_impl.f_report_metadata_xmp) {
        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          status = wuffs_base__suspension__short_read;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
        }
        self->private_impl.f_metadata_chunk_length_value =
            ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
        if (self->private_impl.f_metadata_chunk_length_value > 0) {
          self->private_impl.f_metadata_chunk_length_value += 1;
        } else {
          (iop_a_src += 1, wuffs_base__make_empty_struct());
        }
        self->private_impl.f_metadata_fourcc_value = 1481461792;
        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(
            wuffs_base__u64__sat_add(a_src->meta.pos,
                                     ((uint64_t)(iop_a_src - io0_a_src))),
            self->private_impl.f_metadata_chunk_length_value);
        self->private_impl.f_call_sequence = 1;
        status = wuffs_base__warning__metadata_reported;
        goto ok;
      }
      goto label_0_break;
    }
  label_0_break:;
    if (a_src) {
      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
    }
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(12);
    status = wuffs_gif__decoder__skip_blocks(self, a_src);
    if (a_src) {
      iop_a_src = a_src->data.ptr + a_src->meta.ri;
    }
    if (status) {
      goto suspend;
    }

    goto ok;
  ok:
    self->private_impl.p_decode_ae[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_ae[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_data.s_decode_ae[0].v_block_size = v_block_size;
  self->private_data.s_decode_ae[0].v_is_animexts = v_is_animexts;
  self->private_data.s_decode_ae[0].v_is_netscape = v_is_netscape;
  self->private_data.s_decode_ae[0].v_is_iccp = v_is_iccp;
  self->private_data.s_decode_ae[0].v_is_xmp = v_is_xmp;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_gc

static wuffs_base__status  //
wuffs_gif__decoder__decode_gc(wuffs_gif__decoder* self,
                              wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_c = 0;
  uint8_t v_flags = 0;
  uint16_t v_gc_duration_centiseconds = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_gc[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_c = t_0;
    }
    if (v_c != 4) {
      status = wuffs_gif__error__bad_graphic_control;
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_1 = *iop_a_src++;
      v_flags = t_1;
    }
    self->private_impl.f_gc_has_transparent_index = ((v_flags & 1) != 0);
    v_flags = ((v_flags >> 2) & 7);
    if (v_flags == 2) {
      self->private_impl.f_gc_disposal = 1;
    } else if ((v_flags == 3) || (v_flags == 4)) {
      self->private_impl.f_gc_disposal = 2;
    } else {
      self->private_impl.f_gc_disposal = 0;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      uint16_t t_2;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_2 = wuffs_base__load_u16le(iop_a_src);
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_gc[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_gc[0].scratch;
          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
          if (num_bits_2 == 8) {
            t_2 = ((uint16_t)(*scratch));
            break;
          }
          num_bits_2 += 8;
          *scratch |= ((uint64_t)(num_bits_2)) << 56;
        }
      }
      v_gc_duration_centiseconds = t_2;
    }
    self->private_impl.f_gc_duration =
        (((uint64_t)(v_gc_duration_centiseconds)) * 7056000);
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_3 = *iop_a_src++;
      self->private_impl.f_gc_transparent_index = t_3;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_4 = *iop_a_src++;
      v_c = t_4;
    }
    if (v_c != 0) {
      status = wuffs_gif__error__bad_graphic_control;
      goto exit;
    }

    goto ok;
  ok:
    self->private_impl.p_decode_gc[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_gc[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_id_part0

static wuffs_base__status  //
wuffs_gif__decoder__decode_id_part0(wuffs_gif__decoder* self,
                                    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_id_part0[0];
  if (coro_susp_point) {
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      uint32_t t_0;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_0 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_id_part0[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
          if (num_bits_0 == 8) {
            t_0 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_0 += 8;
          *scratch |= ((uint64_t)(num_bits_0)) << 56;
        }
      }
      self->private_impl.f_frame_rect_x0 = t_0;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      uint32_t t_1;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_1 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_id_part0[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
          if (num_bits_1 == 8) {
            t_1 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_1 += 8;
          *scratch |= ((uint64_t)(num_bits_1)) << 56;
        }
      }
      self->private_impl.f_frame_rect_y0 = t_1;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
      uint32_t t_2;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_2 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_id_part0[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
          if (num_bits_2 == 8) {
            t_2 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_2 += 8;
          *scratch |= ((uint64_t)(num_bits_2)) << 56;
        }
      }
      self->private_impl.f_frame_rect_x1 = t_2;
    }
    self->private_impl.f_frame_rect_x1 += self->private_impl.f_frame_rect_x0;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
      uint32_t t_3;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
        t_3 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
        iop_a_src += 2;
      } else {
        self->private_data.s_decode_id_part0[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
          uint32_t num_bits_3 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_3;
          if (num_bits_3 == 8) {
            t_3 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_3 += 8;
          *scratch |= ((uint64_t)(num_bits_3)) << 56;
        }
      }
      self->private_impl.f_frame_rect_y1 = t_3;
    }
    self->private_impl.f_frame_rect_y1 += self->private_impl.f_frame_rect_y0;
    self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
    self->private_impl.f_dst_y = self->private_impl.f_frame_rect_y0;
    if ((self->private_impl.f_call_sequence == 0) &&
        !self->private_impl.f_quirk_enabled_image_bounds_are_strict) {
      self->private_impl.f_width = wuffs_base__u32__max(
          self->private_impl.f_width, self->private_impl.f_frame_rect_x1);
      self->private_impl.f_height = wuffs_base__u32__max(
          self->private_impl.f_height, self->private_impl.f_frame_rect_y1);
    }

    goto ok;
  ok:
    self->private_impl.p_decode_id_part0[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_id_part0[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_id_part1

static wuffs_base__status  //
wuffs_gif__decoder__decode_id_part1(wuffs_gif__decoder* self,
                                    wuffs_base__pixel_buffer* a_dst,
                                    wuffs_base__io_buffer* a_src) {
  wuffs_base__status status = NULL;

  uint8_t v_flags = 0;
  uint8_t v_which_palette = 0;
  uint32_t v_num_palette_entries = 0;
  uint32_t v_i = 0;
  uint32_t v_argb = 0;
  wuffs_base__slice_u8 v_dst_palette = {0};
  wuffs_base__status v_status = NULL;
  uint8_t v_lw = 0;

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_id_part1[0];
  if (coro_susp_point) {
    v_which_palette = self->private_data.s_decode_id_part1[0].v_which_palette;
    v_num_palette_entries =
        self->private_data.s_decode_id_part1[0].v_num_palette_entries;
    v_i = self->private_data.s_decode_id_part1[0].v_i;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_flags = t_0;
    }
    if ((v_flags & 64) != 0) {
      self->private_impl.f_interlace = 4;
    } else {
      self->private_impl.f_interlace = 0;
    }
    v_which_palette = 1;
    if ((v_flags & 128) != 0) {
      v_num_palette_entries = (((uint32_t)(1)) << (1 + (v_flags & 7)));
      v_i = 0;
      while (v_i < v_num_palette_entries) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          uint32_t t_1;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
            t_1 = ((uint32_t)(wuffs_base__load_u24be(iop_a_src)));
            iop_a_src += 3;
          } else {
            self->private_data.s_decode_id_part1[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__suspension__short_read;
                goto suspend;
              }
              uint64_t* scratch =
                  &self->private_data.s_decode_id_part1[0].scratch;
              uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
              *scratch >>= 8;
              *scratch <<= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
              if (num_bits_1 == 16) {
                t_1 = ((uint32_t)(*scratch >> 40));
                break;
              }
              num_bits_1 += 8;
              *scratch |= ((uint64_t)(num_bits_1));
            }
          }
          v_argb = t_1;
        }
        v_argb |= 4278190080;
        self->private_data.f_palettes[1][((4 * v_i) + 0)] =
            ((uint8_t)(((v_argb >> 0) & 255)));
        self->private_data.f_palettes[1][((4 * v_i) + 1)] =
            ((uint8_t)(((v_argb >> 8) & 255)));
        self->private_data.f_palettes[1][((4 * v_i) + 2)] =
            ((uint8_t)(((v_argb >> 16) & 255)));
        self->private_data.f_palettes[1][((4 * v_i) + 3)] =
            ((uint8_t)(((v_argb >> 24) & 255)));
        v_i += 1;
      }
      while (v_i < 256) {
        self->private_data.f_palettes[1][((4 * v_i) + 0)] = 0;
        self->private_data.f_palettes[1][((4 * v_i) + 1)] = 0;
        self->private_data.f_palettes[1][((4 * v_i) + 2)] = 0;
        self->private_data.f_palettes[1][((4 * v_i) + 3)] = 255;
        v_i += 1;
      }
    } else if (self->private_impl.f_quirk_enabled_reject_empty_palette &&
               !self->private_impl.f_has_global_palette) {
      status = wuffs_gif__error__bad_palette;
      goto exit;
    } else if (self->private_impl.f_gc_has_transparent_index) {
      wuffs_base__slice_u8__copy_from_slice(
          wuffs_base__make_slice_u8(self->private_data.f_palettes[1], 1024),
          wuffs_base__make_slice_u8(self->private_data.f_palettes[0], 1024));
    } else {
      v_which_palette = 0;
    }
    if (self->private_impl.f_gc_has_transparent_index) {
      self->private_data.f_palettes[1][(
          (4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 0)] =
          0;
      self->private_data.f_palettes[1][(
          (4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 1)] =
          0;
      self->private_data.f_palettes[1][(
          (4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 2)] =
          0;
      self->private_data.f_palettes[1][(
          (4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 3)] =
          0;
    }
    v_dst_palette = wuffs_base__pixel_buffer__palette(a_dst);
    if (((uint64_t)(v_dst_palette.len)) == 0) {
      v_dst_palette =
          wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024);
    }
    v_status = wuffs_base__pixel_swizzler__prepare(
        &self->private_impl.f_swizzler,
        wuffs_base__pixel_buffer__pixel_format(a_dst), v_dst_palette,
        1191444488,
        wuffs_base__make_slice_u8(
            self->private_data.f_palettes[v_which_palette], 1024));
    if (!wuffs_base__status__is_ok(v_status)) {
      status = v_status;
      if (wuffs_base__status__is_error(status)) {
        goto exit;
      } else if (wuffs_base__status__is_suspension(status)) {
        status = wuffs_base__error__cannot_return_a_suspension;
        goto exit;
      }
      goto ok;
    }
    if (self->private_impl.f_previous_lzw_decode_ended_abruptly) {
      wuffs_base__ignore_status(wuffs_lzw__decoder__initialize(
          &self->private_data.f_lzw, sizeof(wuffs_lzw__decoder), WUFFS_VERSION,
          0));
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_2 = *iop_a_src++;
      v_lw = t_2;
    }
    if (v_lw > 8) {
      status = wuffs_gif__error__bad_literal_width;
      goto exit;
    }
    wuffs_lzw__decoder__set_literal_width(&self->private_data.f_lzw,
                                          ((uint32_t)(v_lw)));
    self->private_impl.f_previous_lzw_decode_ended_abruptly = true;

    goto ok;
  ok:
    self->private_impl.p_decode_id_part1[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_id_part1[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_data.s_decode_id_part1[0].v_which_palette = v_which_palette;
  self->private_data.s_decode_id_part1[0].v_num_palette_entries =
      v_num_palette_entries;
  self->private_data.s_decode_id_part1[0].v_i = v_i;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.decode_id_part2

static wuffs_base__status  //
wuffs_gif__decoder__decode_id_part2(wuffs_gif__decoder* self,
                                    wuffs_base__pixel_buffer* a_dst,
                                    wuffs_base__io_buffer* a_src,
                                    wuffs_base__slice_u8 a_workbuf) {
  wuffs_base__status status = NULL;

  uint64_t v_block_size = 0;
  bool v_need_block_size = false;
  uint64_t v_n_compressed = 0;
  wuffs_base__slice_u8 v_compressed = {0};
  wuffs_base__io_buffer u_r = wuffs_base__empty_io_buffer();
  wuffs_base__io_buffer* v_r = &u_r;
  uint8_t* iop_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io0_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint64_t v_mark = 0;
  wuffs_base__status v_lzw_status = NULL;
  wuffs_base__status v_copy_status = NULL;
  wuffs_base__slice_u8 v_uncompressed = {0};

  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  wuffs_base__io_buffer empty_io_buffer = wuffs_base__empty_io_buffer();

  uint32_t coro_susp_point = self->private_impl.p_decode_id_part2[0];
  if (coro_susp_point) {
    v_block_size = self->private_data.s_decode_id_part2[0].v_block_size;
    v_need_block_size =
        self->private_data.s_decode_id_part2[0].v_need_block_size;
    v_lzw_status = self->private_data.s_decode_id_part2[0].v_lzw_status;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    v_need_block_size = true;
  label_0_continue:;
    while (true) {
      if (v_need_block_size) {
        v_need_block_size = false;
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t t_0 = *iop_a_src++;
          v_block_size = t_0;
        }
      }
      if (v_block_size == 0) {
        goto label_0_break;
      }
      while (((uint64_t)(io2_a_src - iop_a_src)) == 0) {
        status = wuffs_base__suspension__short_read;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
      }
      if (self->private_impl.f_compressed_ri ==
          self->private_impl.f_compressed_wi) {
        self->private_impl.f_compressed_ri = 0;
        self->private_impl.f_compressed_wi = 0;
      }
      while (self->private_impl.f_compressed_wi <= 3841) {
        v_n_compressed = wuffs_base__u64__min(
            v_block_size, ((uint64_t)(io2_a_src - iop_a_src)));
        if (v_n_compressed <= 0) {
          goto label_1_break;
        }
        v_compressed =
            wuffs_base__io_reader__take(&iop_a_src, io2_a_src, v_n_compressed);
        wuffs_base__slice_u8__copy_from_slice(
            wuffs_base__slice_u8__subslice_i(
                wuffs_base__make_slice_u8(self->private_data.f_compressed,
                                          4096),
                self->private_impl.f_compressed_wi),
            v_compressed);
        wuffs_base__u64__sat_add_indirect(&self->private_impl.f_compressed_wi,
                                          v_n_compressed);
        wuffs_base__u64__sat_sub_indirect(&v_block_size, v_n_compressed);
        if (v_block_size > 0) {
          goto label_1_break;
        }
        if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
          v_need_block_size = true;
          goto label_1_break;
        }
        v_block_size = ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
        (iop_a_src += 1, wuffs_base__make_empty_struct());
      }
    label_1_break:;
      if (1 > ((uint64_t)(a_workbuf.len))) {
        status = wuffs_base__error__bad_workbuf_length;
        goto exit;
      }
    label_2_continue:;
      while (true) {
        if ((self->private_impl.f_compressed_ri >
             self->private_impl.f_compressed_wi) ||
            (self->private_impl.f_compressed_wi > 4096)) {
          status = wuffs_gif__error__internal_error_inconsistent_ri_wi;
          goto exit;
        }
        {
          wuffs_base__io_buffer* o_0_v_r = v_r;
          uint8_t* o_0_iop_v_r = iop_v_r;
          uint8_t* o_0_io0_v_r = io0_v_r;
          uint8_t* o_0_io1_v_r = io1_v_r;
          uint8_t* o_0_io2_v_r = io2_v_r;
          v_r = wuffs_base__io_reader__set(
              &u_r, &iop_v_r, &io0_v_r, &io1_v_r, &io2_v_r,
              wuffs_base__slice_u8__subslice_ij(
                  wuffs_base__make_slice_u8(self->private_data.f_compressed,
                                            4096),
                  self->private_impl.f_compressed_ri,
                  self->private_impl.f_compressed_wi));
          v_mark = ((uint64_t)(iop_v_r - io0_v_r));
          {
            u_r.meta.ri = ((size_t)(iop_v_r - u_r.data.ptr));
            wuffs_base__status t_1 = wuffs_lzw__decoder__decode_io_writer(
                &self->private_data.f_lzw, &empty_io_buffer, v_r,
                wuffs_base__utility__empty_slice_u8());
            iop_v_r = u_r.data.ptr + u_r.meta.ri;
            v_lzw_status = t_1;
          }
          wuffs_base__u64__sat_add_indirect(
              &self->private_impl.f_compressed_ri,
              wuffs_base__io__count_since(v_mark,
                                          ((uint64_t)(iop_v_r - io0_v_r))));
          v_r = o_0_v_r;
          iop_v_r = o_0_iop_v_r;
          io0_v_r = o_0_io0_v_r;
          io1_v_r = o_0_io1_v_r;
          io2_v_r = o_0_io2_v_r;
        }
        v_uncompressed = wuffs_lzw__decoder__flush(&self->private_data.f_lzw);
        if (((uint64_t)(v_uncompressed.len)) > 0) {
          v_copy_status = wuffs_gif__decoder__copy_to_image_buffer(
              self, a_dst, v_uncompressed);
          if (wuffs_base__status__is_error(v_copy_status)) {
            status = v_copy_status;
            goto exit;
          }
        }
        if (wuffs_base__status__is_ok(v_lzw_status)) {
          self->private_impl.f_previous_lzw_decode_ended_abruptly = false;
          if (v_need_block_size || (v_block_size > 0)) {
            self->private_data.s_decode_id_part2[0].scratch =
                ((uint32_t)(v_block_size));
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
            if (self->private_data.s_decode_id_part2[0].scratch >
                ((uint64_t)(io2_a_src - iop_a_src))) {
              self->private_data.s_decode_id_part2[0].scratch -=
                  ((uint64_t)(io2_a_src - iop_a_src));
              iop_a_src = io2_a_src;
              status = wuffs_base__suspension__short_read;
              goto suspend;
            }
            iop_a_src += self->private_data.s_decode_id_part2[0].scratch;
            if (a_src) {
              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
            }
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
            status = wuffs_gif__decoder__skip_blocks(self, a_src);
            if (a_src) {
              iop_a_src = a_src->data.ptr + a_src->meta.ri;
            }
            if (status) {
              goto suspend;
            }
          }
          goto label_0_break;
        } else if (v_lzw_status == wuffs_base__suspension__short_read) {
          goto label_0_continue;
        } else if (v_lzw_status == wuffs_base__suspension__short_write) {
          goto label_2_continue;
        }
        status = v_lzw_status;
        if (wuffs_base__status__is_error(status)) {
          goto exit;
        } else if (wuffs_base__status__is_suspension(status)) {
          status = wuffs_base__error__cannot_return_a_suspension;
          goto exit;
        }
        goto ok;
      }
    }
  label_0_break:;
    self->private_impl.f_compressed_ri = 0;
    self->private_impl.f_compressed_wi = 0;
    if ((self->private_impl.f_dst_y < self->private_impl.f_frame_rect_y1) &&
        (self->private_impl.f_frame_rect_x0 !=
         self->private_impl.f_frame_rect_x1) &&
        (self->private_impl.f_frame_rect_y0 !=
         self->private_impl.f_frame_rect_y1)) {
      status = wuffs_base__error__not_enough_data;
      goto exit;
    }

    goto ok;
  ok:
    self->private_impl.p_decode_id_part2[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_id_part2[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_data.s_decode_id_part2[0].v_block_size = v_block_size;
  self->private_data.s_decode_id_part2[0].v_need_block_size = v_need_block_size;
  self->private_data.s_decode_id_part2[0].v_lzw_status = v_lzw_status;

  goto exit;
exit:
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  return status;
}

// -------- func gif.decoder.copy_to_image_buffer

static wuffs_base__status  //
wuffs_gif__decoder__copy_to_image_buffer(wuffs_gif__decoder* self,
                                         wuffs_base__pixel_buffer* a_pb,
                                         wuffs_base__slice_u8 a_src) {
  wuffs_base__slice_u8 v_dst = {0};
  wuffs_base__slice_u8 v_src = {0};
  uint64_t v_width_in_bytes = 0;
  uint64_t v_n = 0;
  uint64_t v_src_ri = 0;
  uint32_t v_bytes_per_pixel = 0;
  uint32_t v_pixfmt_channels = 0;
  wuffs_base__table_u8 v_tab = {0};
  uint64_t v_i = 0;
  uint64_t v_j = 0;
  uint32_t v_replicate_y0 = 0;
  uint32_t v_replicate_y1 = 0;
  wuffs_base__slice_u8 v_replicate_dst = {0};
  wuffs_base__slice_u8 v_replicate_src = {0};

  v_pixfmt_channels = (wuffs_base__pixel_buffer__pixel_format(a_pb) & 65535);
  if (v_pixfmt_channels == 34952) {
    v_bytes_per_pixel = 4;
  } else if (v_pixfmt_channels == 2184) {
    v_bytes_per_pixel = 3;
  } else if (v_pixfmt_channels == 8) {
    v_bytes_per_pixel = 1;
  } else {
    return wuffs_base__error__unsupported_option;
  }
  v_width_in_bytes = (((uint64_t)(self->private_impl.f_width)) *
                      ((uint64_t)(v_bytes_per_pixel)));
  v_tab = wuffs_base__pixel_buffer__plane(a_pb, 0);
label_0_continue:;
  while (v_src_ri < ((uint64_t)(a_src.len))) {
    v_src = wuffs_base__slice_u8__subslice_i(a_src, v_src_ri);
    if (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1) {
      if (self->private_impl.f_quirk_enabled_ignore_too_much_pixel_data) {
        return NULL;
      }
      return wuffs_base__error__too_much_data;
    }
    v_dst = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
    if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, 0);
    } else if (v_width_in_bytes < ((uint64_t)(v_dst.len))) {
      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_width_in_bytes);
    }
    v_i = (((uint64_t)(self->private_impl.f_dst_x)) *
           ((uint64_t)(v_bytes_per_pixel)));
    if (v_i < ((uint64_t)(v_dst.len))) {
      v_j = (((uint64_t)(self->private_impl.f_frame_rect_x1)) *
             ((uint64_t)(v_bytes_per_pixel)));
      if ((v_i <= v_j) && (v_j <= ((uint64_t)(v_dst.len)))) {
        v_dst = wuffs_base__slice_u8__subslice_ij(v_dst, v_i, v_j);
      } else {
        v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_i);
      }
      v_n = wuffs_base__pixel_swizzler__swizzle_interleaved(
          &self->private_impl.f_swizzler, v_dst,
          wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024),
          v_src);
      wuffs_base__u64__sat_add_indirect(&v_src_ri, v_n);
      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x,
                                        ((uint32_t)((v_n & 4294967295))));
      self->private_impl.f_dirty_max_excl_y = wuffs_base__u32__max(
          self->private_impl.f_dirty_max_excl_y,
          wuffs_base__u32__sat_add(self->private_impl.f_dst_y, 1));
    }
    if (self->private_impl.f_frame_rect_x1 <= self->private_impl.f_dst_x) {
      self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
      if (self->private_impl.f_interlace == 0) {
        wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_y, 1);
        goto label_0_continue;
      }
      if ((self->private_impl.f_num_decoded_frames_value == 0) &&
          !self->private_impl.f_gc_has_transparent_index &&
          (self->private_impl.f_interlace > 1)) {
        v_replicate_src =
            wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
        v_replicate_y0 =
            wuffs_base__u32__sat_add(self->private_impl.f_dst_y, 1);
        v_replicate_y1 = wuffs_base__u32__sat_add(
            self->private_impl.f_dst_y,
            ((uint32_t)(
                wuffs_gif__interlace_count[self->private_impl.f_interlace])));
        v_replicate_y1 = wuffs_base__u32__min(
            v_replicate_y1, self->private_impl.f_frame_rect_y1);
        while (v_replicate_y0 < v_replicate_y1) {
          v_replicate_dst = wuffs_base__table_u8__row(v_tab, v_replicate_y0);
          wuffs_base__slice_u8__copy_from_slice(v_replicate_dst,
                                                v_replicate_src);
          v_replicate_y0 += 1;
        }
        self->private_impl.f_dirty_max_excl_y = wuffs_base__u32__max(
            self->private_impl.f_dirty_max_excl_y, v_replicate_y1);
      }
      wuffs_base__u32__sat_add_indirect(
          &self->private_impl.f_dst_y,
          ((uint32_t)(
              wuffs_gif__interlace_delta[self->private_impl.f_interlace])));
      while (
          (self->private_impl.f_interlace > 0) &&
          (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1)) {
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
        self->private_impl.f_interlace -= 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
        self->private_impl.f_dst_y = wuffs_base__u32__sat_add(
            self->private_impl.f_frame_rect_y0,
            wuffs_gif__interlace_start[self->private_impl.f_interlace]);
      }
      goto label_0_continue;
    }
    if (((uint64_t)(a_src.len)) == v_src_ri) {
      goto label_0_break;
    } else if (((uint64_t)(a_src.len)) < v_src_ri) {
      return wuffs_gif__error__internal_error_inconsistent_ri_wi;
    }
    v_n = ((uint64_t)(
        (self->private_impl.f_frame_rect_x1 - self->private_impl.f_dst_x)));
    v_n = wuffs_base__u64__min(v_n, (((uint64_t)(a_src.len)) - v_src_ri));
    wuffs_base__u64__sat_add_indirect(&v_src_ri, v_n);
    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x,
                                      ((uint32_t)((v_n & 4294967295))));
    if (self->private_impl.f_frame_rect_x1 <= self->private_impl.f_dst_x) {
      self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
      wuffs_base__u32__sat_add_indirect(
          &self->private_impl.f_dst_y,
          ((uint32_t)(
              wuffs_gif__interlace_delta[self->private_impl.f_interlace])));
      while (
          (self->private_impl.f_interlace > 0) &&
          (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1)) {
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
        self->private_impl.f_interlace -= 1;
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
        self->private_impl.f_dst_y = wuffs_base__u32__sat_add(
            self->private_impl.f_frame_rect_y0,
            wuffs_gif__interlace_start[self->private_impl.f_interlace]);
      }
      goto label_0_continue;
    }
    if (v_src_ri != ((uint64_t)(a_src.len))) {
      return wuffs_gif__error__internal_error_inconsistent_ri_wi;
    }
    goto label_0_break;
  }
label_0_break:;
  return NULL;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GIF)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GZIP)

// ---------------- Status Codes Implementations

const char* wuffs_gzip__error__bad_checksum = "#gzip: bad checksum";
const char* wuffs_gzip__error__bad_compression_method =
    "#gzip: bad compression method";
const char* wuffs_gzip__error__bad_encoding_flags = "#gzip: bad encoding flags";
const char* wuffs_gzip__error__bad_header = "#gzip: bad header";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_gzip__decoder__initialize(wuffs_gzip__decoder* self,
                                size_t sizeof_star_self,
                                uint64_t wuffs_version,
                                uint32_t initialize_flags) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__error__bad_sizeof_receiver;
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__error__bad_wuffs_version;
  }

  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
// The whole point of this if-check is to detect an uninitialized *self.
// We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  {
    wuffs_base__status z = wuffs_crc32__ieee_hasher__initialize(
        &self->private_data.f_checksum, sizeof(self->private_data.f_checksum),
        WUFFS_VERSION, initialize_flags);
    if (z) {
      return z;
    }
  }
  {
    wuffs_base__status z = wuffs_deflate__decoder__initialize(
        &self->private_data.f_flate, sizeof(self->private_data.f_flate),
        WUFFS_VERSION, initialize_flags);
    if (z) {
      return z;
    }
  }
  self->private_impl.magic = WUFFS_BASE__MAGIC;
  return NULL;
}

size_t  //
sizeof__wuffs_gzip__decoder() {
  return sizeof(wuffs_gzip__decoder);
}

// ---------------- Function Implementations

// -------- func gzip.decoder.set_ignore_checksum

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_gzip__decoder__set_ignore_checksum(wuffs_gzip__decoder* self, bool a_ic) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  self->private_impl.f_ignore_checksum = a_ic;
  return wuffs_base__make_empty_struct();
}

// -------- func gzip.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_gzip__decoder__workbuf_len(const wuffs_gzip__decoder* self) {
  if (!self) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }

  return wuffs_base__utility__make_range_ii_u64(1, 1);
}

// -------- func gzip.decoder.decode_io_writer

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_gzip__decoder__decode_io_writer(wuffs_gzip__decoder* self,
                                      wuffs_base__io_buffer* a_dst,
                                      wuffs_base__io_buffer* a_src,
                                      wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
               ? wuffs_base__error__disabled_by_previous_error
               : wuffs_base__error__initialize_not_called;
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__bad_argument;
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__interleaved_coroutine_calls;
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = NULL;

  uint8_t v_c = 0;
  uint8_t v_flags = 0;
  uint16_t v_xlen = 0;
  uint64_t v_mark = 0;
  uint32_t v_checksum_got = 0;
  uint32_t v_decoded_length_got = 0;
  wuffs_base__status v_status = NULL;
  uint32_t v_checksum_want = 0;
  uint32_t v_decoded_length_want = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_io_writer[0];
  if (coro_susp_point) {
    v_flags = self->private_data.s_decode_io_writer[0].v_flags;
    v_checksum_got = self->private_data.s_decode_io_writer[0].v_checksum_got;
    v_decoded_length_got =
        self->private_data.s_decode_io_writer[0].v_decoded_length_got;
    v_checksum_want = self->private_data.s_decode_io_writer[0].v_checksum_want;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_0 = *iop_a_src++;
      v_c = t_0;
    }
    if (v_c != 31) {
      status = wuffs_gzip__error__bad_header;
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_1 = *iop_a_src++;
      v_c = t_1;
    }
    if (v_c != 139) {
      status = wuffs_gzip__error__bad_header;
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_2 = *iop_a_src++;
      v_c = t_2;
    }
    if (v_c != 8) {
      status = wuffs_gzip__error__bad_compression_method;
      goto exit;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      uint8_t t_3 = *iop_a_src++;
      v_flags = t_3;
    }
    self->private_data.s_decode_io_writer[0].scratch = 6;
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
    if (self->private_data.s_decode_io_writer[0].scratch >
        ((uint64_t)(io2_a_src - iop_a_src))) {
      self->private_data.s_decode_io_writer[0].scratch -=
          ((uint64_t)(io2_a_src - iop_a_src));
      iop_a_src = io2_a_src;
      status = wuffs_base__suspension__short_read;
      goto suspend;
    }
    iop_a_src += self->private_data.s_decode_io_writer[0].scratch;
    if ((v_flags & 4) != 0) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
        uint16_t t_4;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_4 = wuffs_base__load_u16le(iop_a_src);
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_io_writer[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__suspension__short_read;
              goto suspend;
            }
            uint64_t* scratch =
                &self->private_data.s_decode_io_writer[0].scratch;
            uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
            *scratch <<= 8;
            *scratch >>= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
            if (num_bits_4 == 8) {
              t_4 = ((uint16_t)(*scratch));
              break;
            }
            num_bits_4 += 8;
            *scratch |= ((uint64_t)(num_bits_4)) << 56;
          }
        }
        v_xlen = t_4;
      }
      self->private_data.s_decode_io_writer[0].scratch = ((uint32_t)(v_xlen));
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
      if (self->private_data.s_decode_io_writer[0].scratch >
          ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_decode_io_writer[0].scratch -=
            ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      iop_a_src += self->private_data.s_decode_io_writer[0].scratch;
    }
    if ((v_flags & 8) != 0) {
      while (true) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint8_t t_5 = *iop_a_src++;
          v_c = t_5;
        }
        if (v_c == 0) {
          goto label_0_break;
        }
      }
    label_0_break:;
    }
    if ((v_flags & 16) != 0) {
      while (true) {
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint8_t t_6 = *iop_a_src++;
          v_c = t_6;
        }
        if (v_c == 0) {
          goto label_1_break;
        }
      }
    label_1_break:;
    }
    if ((v_flags & 2) != 0) {
      self->private_data.s_decode_io_writer[0].scratch = 2;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
      if (self->private_data.s_decode_io_writer[0].scratch >
          ((uint64_t)(io2_a_src - iop_a_src))) {
        self->private_data.s_decode_io_writer[0].scratch -=
            ((uint64_t)(io2_a_src - iop_a_src));
        iop_a_src = io2_a_src;
        status = wuffs_base__suspension__short_read;
        goto suspend;
      }
      iop_a_src += self->private_data.s_decode_io_writer[0].scratch;
    }
    if ((v_flags & 224) != 0) {
      status = wuffs_gzip__error__bad_encoding_flags;
      goto exit;
    }
    while (true) {
      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
      {
        if (a_dst) {
          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        wuffs_base__status t_7 = wuffs_deflate__decoder__decode_io_writer(
            &self->private_data.f_flate, a_dst, a_src, a_workbuf);
        if (a_dst) {
          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
        }
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        v_status = t_7;
      }
      if (!self->private_impl.f_ignore_checksum) {
        v_checksum_got = wuffs_crc32__ieee_hasher__update_u32(
            &self->private_data.f_checksum,
            wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)),
                                  io0_a_dst));
        v_decoded_length_got +=
            ((uint32_t)((wuffs_base__io__count_since(
                             v_mark, ((uint64_t)(iop_a_dst - io0_a_dst))) &
                         4294967295)));
      }
      if (wuffs_base__status__is_ok(v_status)) {
        goto label_2_break;
      }
      status = v_status;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(12);
    }
  label_2_break:;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
      uint32_t t_8;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_8 = wuffs_base__load_u32le(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_io_writer[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_io_writer[0].scratch;
          uint32_t num_bits_8 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_8;
          if (num_bits_8 == 24) {
            t_8 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_8 += 8;
          *scratch |= ((uint64_t)(num_bits_8)) << 56;
        }
      }
      v_checksum_want = t_8;
    }
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(15);
      uint32_t t_9;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_9 = wuffs_base__load_u32le(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_io_writer[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_io_writer[0].scratch;
          uint32_t num_bits_9 = ((uint32_t)(*scratch >> 56));
          *scratch <<= 8;
          *scratch >>= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_9;
          if (num_bits_9 == 24) {
            t_9 = ((uint32_t)(*scratch));
            break;
          }
          num_bits_9 += 8;
          *scratch |= ((uint64_t)(num_bits_9)) << 56;
        }
      }
      v_decoded_length_want = t_9;
    }
    if (!self->private_impl.f_ignore_checksum &&
        ((v_checksum_got != v_checksum_want) ||
         (v_decoded_length_got != v_decoded_length_want))) {
      status = wuffs_gzip__error__bad_checksum;
      goto exit;
    }

    goto ok;
  ok:
    self->private_impl.p_decode_io_writer[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_io_writer[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine =
      wuffs_base__status__is_suspension(status) ? 1 : 0;
  self->private_data.s_decode_io_writer[0].v_flags = v_flags;
  self->private_data.s_decode_io_writer[0].v_checksum_got = v_checksum_got;
  self->private_data.s_decode_io_writer[0].v_decoded_length_got =
      v_decoded_length_got;
  self->private_data.s_decode_io_writer[0].v_checksum_want = v_checksum_want;

  goto exit;
exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__GZIP)

#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ZLIB)

// ---------------- Status Codes Implementations

const char* wuffs_zlib__warning__dictionary_required =
    "@zlib: dictionary required";
const char* wuffs_zlib__error__bad_checksum = "#zlib: bad checksum";
const char* wuffs_zlib__error__bad_compression_method =
    "#zlib: bad compression method";
const char* wuffs_zlib__error__bad_compression_window_size =
    "#zlib: bad compression window size";
const char* wuffs_zlib__error__bad_parity_check = "#zlib: bad parity check";
const char* wuffs_zlib__error__incorrect_dictionary =
    "#zlib: incorrect dictionary";

// ---------------- Private Consts

// ---------------- Private Initializer Prototypes

// ---------------- Private Function Prototypes

// ---------------- Initializer Implementations

wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
wuffs_zlib__decoder__initialize(wuffs_zlib__decoder* self,
                                size_t sizeof_star_self,
                                uint64_t wuffs_version,
                                uint32_t initialize_flags) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (sizeof(*self) != sizeof_star_self) {
    return wuffs_base__error__bad_sizeof_receiver;
  }
  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
    return wuffs_base__error__bad_wuffs_version;
  }

  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
// The whole point of this if-check is to detect an uninitialized *self.
// We disable the warning on GCC. Clang-5.0 does not have this warning.
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
    if (self->private_impl.magic != 0) {
      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
    }
#if !defined(__clang__) && defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
  } else {
    if ((initialize_flags &
         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
      memset(self, 0, sizeof(*self));
      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
    } else {
      memset(&(self->private_impl), 0, sizeof(self->private_impl));
    }
  }

  {
    wuffs_base__status z = wuffs_adler32__hasher__initialize(
        &self->private_data.f_checksum, sizeof(self->private_data.f_checksum),
        WUFFS_VERSION, initialize_flags);
    if (z) {
      return z;
    }
  }
  {
    wuffs_base__status z = wuffs_adler32__hasher__initialize(
        &self->private_data.f_dict_id_hasher,
        sizeof(self->private_data.f_dict_id_hasher), WUFFS_VERSION,
        initialize_flags);
    if (z) {
      return z;
    }
  }
  {
    wuffs_base__status z = wuffs_deflate__decoder__initialize(
        &self->private_data.f_flate, sizeof(self->private_data.f_flate),
        WUFFS_VERSION, initialize_flags);
    if (z) {
      return z;
    }
  }
  self->private_impl.magic = WUFFS_BASE__MAGIC;
  return NULL;
}

size_t  //
sizeof__wuffs_zlib__decoder() {
  return sizeof(wuffs_zlib__decoder);
}

// ---------------- Function Implementations

// -------- func zlib.decoder.dictionary_id

WUFFS_BASE__MAYBE_STATIC uint32_t  //
wuffs_zlib__decoder__dictionary_id(const wuffs_zlib__decoder* self) {
  if (!self) {
    return 0;
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return 0;
  }

  return self->private_impl.f_dict_id_want;
}

// -------- func zlib.decoder.add_dictionary

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_zlib__decoder__add_dictionary(wuffs_zlib__decoder* self,
                                    wuffs_base__slice_u8 a_dict) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  if (self->private_impl.f_header_complete) {
    self->private_impl.f_bad_call_sequence = true;
  } else {
    self->private_impl.f_dict_id_got = wuffs_adler32__hasher__update_u32(
        &self->private_data.f_dict_id_hasher, a_dict);
    wuffs_deflate__decoder__add_history(&self->private_data.f_flate, a_dict);
  }
  self->private_impl.f_got_dictionary = true;
  return wuffs_base__make_empty_struct();
}

// -------- func zlib.decoder.set_ignore_checksum

WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
wuffs_zlib__decoder__set_ignore_checksum(wuffs_zlib__decoder* self, bool a_ic) {
  if (!self) {
    return wuffs_base__make_empty_struct();
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return wuffs_base__make_empty_struct();
  }

  self->private_impl.f_ignore_checksum = a_ic;
  return wuffs_base__make_empty_struct();
}

// -------- func zlib.decoder.workbuf_len

WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
wuffs_zlib__decoder__workbuf_len(const wuffs_zlib__decoder* self) {
  if (!self) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }
  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
    return wuffs_base__utility__make_range_ii_u64(0, 0);
  }

  return wuffs_base__utility__make_range_ii_u64(1, 1);
}

// -------- func zlib.decoder.decode_io_writer

WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
wuffs_zlib__decoder__decode_io_writer(wuffs_zlib__decoder* self,
                                      wuffs_base__io_buffer* a_dst,
                                      wuffs_base__io_buffer* a_src,
                                      wuffs_base__slice_u8 a_workbuf) {
  if (!self) {
    return wuffs_base__error__bad_receiver;
  }
  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
               ? wuffs_base__error__disabled_by_previous_error
               : wuffs_base__error__initialize_not_called;
  }
  if (!a_dst || !a_src) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__bad_argument;
  }
  if ((self->private_impl.active_coroutine != 0) &&
      (self->private_impl.active_coroutine != 1)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
    return wuffs_base__error__interleaved_coroutine_calls;
  }
  self->private_impl.active_coroutine = 0;
  wuffs_base__status status = NULL;

  uint16_t v_x = 0;
  uint32_t v_checksum_got = 0;
  wuffs_base__status v_status = NULL;
  uint32_t v_checksum_want = 0;
  uint64_t v_mark = 0;

  uint8_t* iop_a_dst = NULL;
  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_dst) {
    io0_a_dst = a_dst->data.ptr;
    io1_a_dst = io0_a_dst + a_dst->meta.wi;
    iop_a_dst = io1_a_dst;
    io2_a_dst = io0_a_dst + a_dst->data.len;
    if (a_dst->meta.closed) {
      io2_a_dst = iop_a_dst;
    }
  }
  uint8_t* iop_a_src = NULL;
  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
  if (a_src) {
    io0_a_src = a_src->data.ptr;
    io1_a_src = io0_a_src + a_src->meta.ri;
    iop_a_src = io1_a_src;
    io2_a_src = io0_a_src + a_src->meta.wi;
  }

  uint32_t coro_susp_point = self->private_impl.p_decode_io_writer[0];
  if (coro_susp_point) {
    v_checksum_got = self->private_data.s_decode_io_writer[0].v_checksum_got;
  }
  switch (coro_susp_point) {
    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;

    if (self->private_impl.f_bad_call_sequence) {
      status = wuffs_base__error__bad_call_sequence;
      goto exit;
    } else if (!self->private_impl.f_want_dictionary) {
      {
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
        uint16_t t_0;
        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
          t_0 = wuffs_base__load_u16be(iop_a_src);
          iop_a_src += 2;
        } else {
          self->private_data.s_decode_io_writer[0].scratch = 0;
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
          while (true) {
            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
              status = wuffs_base__suspension__short_read;
              goto suspend;
            }
            uint64_t* scratch =
                &self->private_data.s_decode_io_writer[0].scratch;
            uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
            *scratch >>= 8;
            *scratch <<= 8;
            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
            if (num_bits_0 == 8) {
              t_0 = ((uint16_t)(*scratch >> 48));
              break;
            }
            num_bits_0 += 8;
            *scratch |= ((uint64_t)(num_bits_0));
          }
        }
        v_x = t_0;
      }
      if (((v_x >> 8) & 15) != 8) {
        status = wuffs_zlib__error__bad_compression_method;
        goto exit;
      }
      if ((v_x >> 12) > 7) {
        status = wuffs_zlib__error__bad_compression_window_size;
        goto exit;
      }
      if ((v_x % 31) != 0) {
        status = wuffs_zlib__error__bad_parity_check;
        goto exit;
      }
      self->private_impl.f_want_dictionary = ((v_x & 32) != 0);
      if (self->private_impl.f_want_dictionary) {
        self->private_impl.f_dict_id_got = 1;
        {
          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
          uint32_t t_1;
          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
            t_1 = wuffs_base__load_u32be(iop_a_src);
            iop_a_src += 4;
          } else {
            self->private_data.s_decode_io_writer[0].scratch = 0;
            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
            while (true) {
              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
                status = wuffs_base__suspension__short_read;
                goto suspend;
              }
              uint64_t* scratch =
                  &self->private_data.s_decode_io_writer[0].scratch;
              uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
              *scratch >>= 8;
              *scratch <<= 8;
              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
              if (num_bits_1 == 24) {
                t_1 = ((uint32_t)(*scratch >> 32));
                break;
              }
              num_bits_1 += 8;
              *scratch |= ((uint64_t)(num_bits_1));
            }
          }
          self->private_impl.f_dict_id_want = t_1;
        }
        status = wuffs_zlib__warning__dictionary_required;
        goto ok;
      } else if (self->private_impl.f_got_dictionary) {
        status = wuffs_zlib__error__incorrect_dictionary;
        goto exit;
      }
    } else if (self->private_impl.f_dict_id_got !=
               self->private_impl.f_dict_id_want) {
      if (self->private_impl.f_got_dictionary) {
        status = wuffs_zlib__error__incorrect_dictionary;
        goto exit;
      }
      status = wuffs_zlib__warning__dictionary_required;
      goto ok;
    }
    self->private_impl.f_header_complete = true;
    while (true) {
      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
      {
        if (a_dst) {
          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
        }
        if (a_src) {
          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
        }
        wuffs_base__status t_2 = wuffs_deflate__decoder__decode_io_writer(
            &self->private_data.f_flate, a_dst, a_src, a_workbuf);
        if (a_dst) {
          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
        }
        if (a_src) {
          iop_a_src = a_src->data.ptr + a_src->meta.ri;
        }
        v_status = t_2;
      }
      if (!self->private_impl.f_ignore_checksum) {
        v_checksum_got = wuffs_adler32__hasher__update_u32(
            &self->private_data.f_checksum,
            wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)),
                                  io0_a_dst));
      }
      if (wuffs_base__status__is_ok(v_status)) {
        goto label_0_break;
      }
      status = v_status;
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
    }
  label_0_break:;
    {
      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
      uint32_t t_3;
      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
        t_3 = wuffs_base__load_u32be(iop_a_src);
        iop_a_src += 4;
      } else {
        self->private_data.s_decode_io_writer[0].scratch = 0;
        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
        while (true) {
          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
            status = wuffs_base__suspension__short_read;
            goto suspend;
          }
          uint64_t* scratch = &self->private_data.s_decode_io_writer[0].scratch;
          uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
          *scratch >>= 8;
          *scratch <<= 8;
          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
          if (num_bits_3 == 24) {
            t_3 = ((uint32_t)(*scratch >> 32));
            break;
          }
          num_bits_3 += 8;
          *scratch |= ((uint64_t)(num_bits_3));
        }
      }
      v_checksum_want = t_3;
    }
    if (!self->private_impl.f_ignore_checksum &&
        (v_checksum_got != v_checksum_want)) {
      status = wuffs_zlib__error__bad_checksum;
      goto exit;
    }

    goto ok;
  ok:
    self->private_impl.p_decode_io_writer[0] = 0;
    goto exit;
  }

  goto suspend;
suspend:
  self->private_impl.p_decode_io_writer[0] =
      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
  self->private_impl.active_coroutine =
      wuffs_base__status__is_suspension(status) ? 1 : 0;
  self->private_data.s_decode_io_writer[0].v_checksum_got = v_checksum_got;

  goto exit;
exit:
  if (a_dst) {
    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
  }
  if (a_src) {
    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
  }

  if (wuffs_base__status__is_error(status)) {
    self->private_impl.magic = WUFFS_BASE__DISABLED;
  }
  return status;
}

#endif  // !defined(WUFFS_CONFIG__MODULES) ||
        // defined(WUFFS_CONFIG__MODULE__ZLIB)

#endif  // WUFFS_IMPLEMENTATION

#endif  // WUFFS_INCLUDE_GUARD