xref: /aosp_15_r20/external/flac/src/test_libFLAC++/metadata_manip.cpp (revision 600f14f40d737144c998e2ec7a483122d3776fbc)

/* test_libFLAC++ - Unit tester for libFLAC++
 * Copyright (C) 2002-2009  Josh Coalson
 * Copyright (C) 2011-2023  Xiph.Org Foundation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <stdio.h>
#include <stdlib.h> /* for malloc() */
#include <string.h> /* for memcpy()/memset() */
#include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
#ifdef _MSC_VER
#include <sys/utime.h>
#endif
#if !defined _MSC_VER && !defined __MINGW32__ && !defined __EMX__
#include <unistd.h> /* for chown(), unlink() */
#endif
#include <sys/stat.h> /* for stat(), maybe chmod() */
#include "FLAC/assert.h"
#include "FLAC++/decoder.h"
#include "FLAC++/metadata.h"
#include "share/grabbag.h"
#include "share/compat.h"
#include "share/macros.h"
#include "share/safe_str.h"
extern "C" {
#include "test_libs_common/file_utils_flac.h"
}

/******************************************************************************
	The general strategy of these tests (for interface levels 1 and 2) is
	to create a dummy FLAC file with a known set of initial metadata
	blocks, then keep a mirror locally of what we expect the metadata to be
	after each operation.  Then testing becomes a simple matter of running
	a FLAC::Decoder::File over the dummy file after each operation, comparing
	the decoded metadata to what's in our local copy.  If there are any
	differences in the metadata, or the actual audio data is corrupted, we
	will catch it while decoding.
******************************************************************************/

class OurFileDecoder: public FLAC::Decoder::File {
public:
	inline OurFileDecoder(bool ignore_metadata): ignore_metadata_(ignore_metadata), error_occurred_(false) { }

	bool ignore_metadata_;
	bool error_occurred_;
protected:
	::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
	void metadata_callback(const ::FLAC__StreamMetadata *metadata);
	void error_callback(::FLAC__StreamDecoderErrorStatus status);
};

struct OurMetadata {
	FLAC::Metadata::Prototype *blocks[64];
	uint32_t num_blocks;
};

/* our copy of the metadata in flacfilename() */
static OurMetadata our_metadata_;

/* the current block number that corresponds to the position of the iterator we are testing */
static uint32_t mc_our_block_number_ = 0;

static const char *flacfilename(bool is_ogg)
{
	return is_ogg? "metadata.oga" : "metadata.flac";
}

static bool die_(const char *msg)
{
	printf("ERROR: %s\n", msg);
	return false;
}

static bool die_c_(const char *msg, FLAC::Metadata::Chain::Status status)
{
	printf("ERROR: %s\n", msg);
	printf("       status=%u (%s)\n", (uint32_t)((::FLAC__Metadata_ChainStatus)status), status.as_cstring());
	return false;
}

static bool die_ss_(const char *msg, FLAC::Metadata::SimpleIterator &iterator)
{
	const FLAC::Metadata::SimpleIterator::Status status = iterator.status();
	printf("ERROR: %s\n", msg);
	printf("       status=%u (%s)\n", (uint32_t)((::FLAC__Metadata_SimpleIteratorStatus)status), status.as_cstring());
	return false;
}

static void *malloc_or_die_(size_t size)
{
	void *x = malloc(size);
	if(0 == x) {
		fprintf(stderr, "ERROR: out of memory allocating %u bytes\n", (uint32_t)size);
		exit(1);
	}
	return x;
}

static char *strdup_or_die_(const char *s)
{
	char *x = strdup(s);
	if(0 == x) {
		fprintf(stderr, "ERROR: out of memory copying string \"%s\"\n", s);
		exit(1);
	}
	return x;
}

/* functions for working with our metadata copy */

static bool replace_in_our_metadata_(FLAC::Metadata::Prototype *block, uint32_t position, bool copy)
{
	uint32_t i;
	FLAC::Metadata::Prototype *obj = block;
	FLAC__ASSERT(position < our_metadata_.num_blocks);
	if(copy) {
		if(0 == (obj = FLAC::Metadata::clone(block)))
			return die_("during FLAC::Metadata::clone()");
	}
	delete our_metadata_.blocks[position];
	our_metadata_.blocks[position] = obj;

	/* set the is_last flags */
	for(i = 0; i < our_metadata_.num_blocks - 1; i++)
		our_metadata_.blocks[i]->set_is_last(false);
	our_metadata_.blocks[i]->set_is_last(true);

	return true;
}

static bool insert_to_our_metadata_(FLAC::Metadata::Prototype *block, uint32_t position, bool copy)
{
	uint32_t i;
	FLAC::Metadata::Prototype *obj = block;
	if(copy) {
		if(0 == (obj = FLAC::Metadata::clone(block)))
			return die_("during FLAC::Metadata::clone()");
	}
	if(position > our_metadata_.num_blocks) {
		position = our_metadata_.num_blocks;
	}
	else {
		for(i = our_metadata_.num_blocks; i > position; i--)
			our_metadata_.blocks[i] = our_metadata_.blocks[i-1];
	}
	our_metadata_.blocks[position] = obj;
	our_metadata_.num_blocks++;

	/* set the is_last flags */
	for(i = 0; i < our_metadata_.num_blocks - 1; i++)
		our_metadata_.blocks[i]->set_is_last(false);
	our_metadata_.blocks[i]->set_is_last(true);

	return true;
}

static void delete_from_our_metadata_(uint32_t position)
{
	uint32_t i;
	FLAC__ASSERT(position < our_metadata_.num_blocks);
	delete our_metadata_.blocks[position];
	for(i = position; i < our_metadata_.num_blocks - 1; i++)
		our_metadata_.blocks[i] = our_metadata_.blocks[i+1];
	our_metadata_.num_blocks--;

	/* set the is_last flags */
	if(our_metadata_.num_blocks > 0) {
		for(i = 0; i < our_metadata_.num_blocks - 1; i++)
			our_metadata_.blocks[i]->set_is_last(false);
		our_metadata_.blocks[i]->set_is_last(true);
	}
}

void add_to_padding_length_(uint32_t indx, int delta)
{
	FLAC::Metadata::Padding *padding = dynamic_cast<FLAC::Metadata::Padding *>(our_metadata_.blocks[indx]);
	FLAC__ASSERT(0 != padding);
	padding->set_length((uint32_t)((int)padding->get_length() + delta));
}

/*
 * This wad of functions supports filename- and callback-based chain reading/writing.
 * Everything up to set_file_stats_() is copied from libFLAC/metadata_iterators.c
 */
bool open_tempfile_(const char *filename, FILE **tempfile, char **tempfilename)
{
	static const char *tempfile_suffix = ".metadata_edit";
	size_t destlen = strlen(filename) + strlen(tempfile_suffix) + 1;

	*tempfilename = (char*)malloc(destlen);
	if (*tempfilename == 0)
		return false;
	flac_snprintf(*tempfilename, destlen, "%s%s", filename, tempfile_suffix);

	*tempfile = flac_fopen(*tempfilename, "wb");
	if (*tempfile == 0)
		return false;

	return true;
}

void cleanup_tempfile_(FILE **tempfile, char **tempfilename)
{
	if (*tempfile != 0) {
		(void)fclose(*tempfile);
		*tempfile = 0;
	}

	if (*tempfilename != 0) {
		(void)flac_unlink(*tempfilename);
		free(*tempfilename);
		*tempfilename = 0;
	}
}

bool transport_tempfile_(const char *filename, FILE **tempfile, char **tempfilename)
{
	FLAC__ASSERT(0 != filename);
	FLAC__ASSERT(0 != tempfile);
	FLAC__ASSERT(0 != tempfilename);
	FLAC__ASSERT(0 != *tempfilename);

	if(0 != *tempfile) {
		(void)fclose(*tempfile);
		*tempfile = 0;
	}

#if defined _MSC_VER || defined __MINGW32__ || defined __EMX__
	/* on some flavors of windows, flac_rename() will fail if the destination already exists */
	if(flac_unlink(filename) < 0) {
		cleanup_tempfile_(tempfile, tempfilename);
		return false;
	}
#endif

	if(0 != flac_rename(*tempfilename, filename)) {
		cleanup_tempfile_(tempfile, tempfilename);
		return false;
	}

	cleanup_tempfile_(tempfile, tempfilename);

	return true;
}

bool get_file_stats_(const char *filename, struct flac_stat_s *stats)
{
	FLAC__ASSERT(0 != filename);
	FLAC__ASSERT(0 != stats);
	return (0 == flac_stat(filename, stats));
}

void set_file_stats_(const char *filename, struct flac_stat_s *stats)
{
	FLAC__ASSERT(0 != filename);
	FLAC__ASSERT(0 != stats);

#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200809L) && !defined(_WIN32)
	struct timespec srctime[2] = {};
	srctime[0].tv_sec = stats->st_atime;
	srctime[1].tv_sec = stats->st_mtime;
#else
	struct utimbuf srctime;
	srctime.actime = stats->st_atime;
	srctime.modtime = stats->st_mtime;
#endif
	(void)flac_chmod(filename, stats->st_mode);
	(void)flac_utime(filename, &srctime);
#if !defined _MSC_VER && !defined __MINGW32__ && !defined __EMX__
	FLAC_CHECK_RETURN(chown(filename, stats->st_uid, (gid_t)(-1)));
	FLAC_CHECK_RETURN(chown(filename, (uid_t)(-1), stats->st_gid));
#endif
}

#ifdef FLAC__VALGRIND_TESTING
static size_t chain_write_cb_(const void *ptr, size_t size, size_t nmemb, ::FLAC__IOHandle handle)
{
	FILE *stream = (FILE*)handle;
	size_t ret = fwrite(ptr, size, nmemb, stream);
	if(!ferror(stream))
		fflush(stream);
	return ret;
}
#endif

static int chain_seek_cb_(::FLAC__IOHandle handle, FLAC__int64 offset, int whence)
{
	FLAC__off_t o = (FLAC__off_t)offset;
	FLAC__ASSERT(offset == o);
	return fseeko((FILE*)handle, o, whence);
}

static FLAC__int64 chain_tell_cb_(::FLAC__IOHandle handle)
{
	return ftello((FILE*)handle);
}

static int chain_eof_cb_(::FLAC__IOHandle handle)
{
	return feof((FILE*)handle);
}

static bool write_chain_(FLAC::Metadata::Chain &chain, bool use_padding, bool preserve_file_stats, bool filename_based, const char *filename)
{
	if(filename_based)
		return chain.write(use_padding, preserve_file_stats);
	else {
		::FLAC__IOCallbacks callbacks;

		memset(&callbacks, 0, sizeof(callbacks));
		callbacks.read = (::FLAC__IOCallback_Read)fread;
#ifdef FLAC__VALGRIND_TESTING
		callbacks.write = chain_write_cb_;
#else
		callbacks.write = (::FLAC__IOCallback_Write)fwrite;
#endif
		callbacks.seek = chain_seek_cb_;
		callbacks.eof = chain_eof_cb_;

		if(chain.check_if_tempfile_needed(use_padding)) {
			struct flac_stat_s stats;
			FILE *file, *tempfile;
			char *tempfilename;
			if(preserve_file_stats) {
				if(!get_file_stats_(filename, &stats))
					return false;
			}
			if(0 == (file = flac_fopen(filename, "rb")))
				return false; /*@@@@ chain status still says OK though */
			if(!open_tempfile_(filename, &tempfile, &tempfilename)) {
				fclose(file);
				cleanup_tempfile_(&tempfile, &tempfilename);
				return false; /*@@@@ chain status still says OK though */
			}
			if(!chain.write(use_padding, (::FLAC__IOHandle)file, callbacks, (::FLAC__IOHandle)tempfile, callbacks)) {
				fclose(file);
				fclose(tempfile);
				return false;
			}
			fclose(file);
			fclose(tempfile);
			file = tempfile = 0;
			if(!transport_tempfile_(filename, &tempfile, &tempfilename))
				return false;
			if(preserve_file_stats)
				set_file_stats_(filename, &stats);
		}
		else {
			FILE *file = flac_fopen(filename, "r+b");
			if(0 == file)
				return false; /*@@@@ chain status still says OK though */
			if(!chain.write(use_padding, (::FLAC__IOHandle)file, callbacks)) {
				fclose(file);
				return false;
			}
			fclose(file);
		}
	}

	return true;
}

static bool read_chain_(FLAC::Metadata::Chain &chain, const char *filename, bool filename_based, bool is_ogg)
{
	if(filename_based)
		return chain.read(filename, is_ogg);
	else {
		::FLAC__IOCallbacks callbacks;

		memset(&callbacks, 0, sizeof(callbacks));
		callbacks.read = (::FLAC__IOCallback_Read)fread;
		callbacks.seek = chain_seek_cb_;
		callbacks.tell = chain_tell_cb_;

		{
			bool ret;
			FILE *file = flac_fopen(filename, "rb");
			if(0 == file)
				return false; /*@@@@ chain status still says OK though */
			ret = chain.read((::FLAC__IOHandle)file, callbacks, is_ogg);
			fclose(file);
			return ret;
		}
	}
}

/* function for comparing our metadata to a FLAC::Metadata::Chain */

static bool compare_chain_(FLAC::Metadata::Chain &chain, uint32_t current_position, FLAC::Metadata::Prototype *current_block)
{
	uint32_t i;
	FLAC::Metadata::Iterator iterator;
	bool next_ok = true;

	printf("\tcomparing chain... ");
	fflush(stdout);

	if(!iterator.is_valid())
		return die_("allocating memory for iterator");

	iterator.init(chain);

	i = 0;
	do {
		FLAC::Metadata::Prototype *block;

		printf("%u... ", i);
		fflush(stdout);

		if(0 == (block = iterator.get_block()))
			return die_("getting block from iterator");

		if(*block != *our_metadata_.blocks[i])
			return die_("metadata block mismatch");

		delete block;
		i++;
		next_ok = iterator.next();
	} while(i < our_metadata_.num_blocks && next_ok);

	if(next_ok)
		return die_("chain has more blocks than expected");

	if(i < our_metadata_.num_blocks)
		return die_("short block count in chain");

	if(0 != current_block) {
		printf("CURRENT_POSITION... ");
		fflush(stdout);

		if(*current_block != *our_metadata_.blocks[current_position])
			return die_("metadata block mismatch");
	}

	printf("PASSED\n");

	return true;
}

::FLAC__StreamDecoderWriteStatus OurFileDecoder::write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[])
{
	(void)buffer;

	if(
		(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER && frame->header.number.frame_number == 0) ||
		(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER && frame->header.number.sample_number == 0)
	) {
		printf("content... ");
		fflush(stdout);
	}

	return ::FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}

void OurFileDecoder::metadata_callback(const ::FLAC__StreamMetadata *metadata)
{
	/* don't bother checking if we've already hit an error */
	if(error_occurred_)
		return;

	printf("%u... ", mc_our_block_number_);
	fflush(stdout);

	if(!ignore_metadata_) {
		if(mc_our_block_number_ >= our_metadata_.num_blocks) {
			(void)die_("got more metadata blocks than expected");
			error_occurred_ = true;
		}
		else {
			if(*our_metadata_.blocks[mc_our_block_number_] != metadata) {
				(void)die_("metadata block mismatch");
				error_occurred_ = true;
			}
		}
	}

	mc_our_block_number_++;
}

void OurFileDecoder::error_callback(::FLAC__StreamDecoderErrorStatus status)
{
	error_occurred_ = true;
	printf("ERROR: got error callback, status = %s (%u)\n", FLAC__StreamDecoderErrorStatusString[status], (uint32_t)status);
}

static bool generate_file_(bool include_extras, bool is_ogg)
{
	::FLAC__StreamMetadata streaminfo, vorbiscomment, *cuesheet, picture, padding;
	::FLAC__StreamMetadata *metadata[4];
	uint32_t i = 0, n = 0;

	printf("generating %sFLAC file for test\n", is_ogg? "Ogg " : "");

	while(our_metadata_.num_blocks > 0)
		delete_from_our_metadata_(0);

	streaminfo.is_last = false;
	streaminfo.type = ::FLAC__METADATA_TYPE_STREAMINFO;
	streaminfo.length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
	streaminfo.data.stream_info.min_blocksize = 576;
	streaminfo.data.stream_info.max_blocksize = 576;
	streaminfo.data.stream_info.min_framesize = 0;
	streaminfo.data.stream_info.max_framesize = 0;
	streaminfo.data.stream_info.sample_rate = 44100;
	streaminfo.data.stream_info.channels = 1;
	streaminfo.data.stream_info.bits_per_sample = 8;
	streaminfo.data.stream_info.total_samples = 0;
	memset(streaminfo.data.stream_info.md5sum, 0, 16);

	{
		const uint32_t vendor_string_length = (uint32_t)strlen(FLAC__VENDOR_STRING);
		vorbiscomment.is_last = false;
		vorbiscomment.type = ::FLAC__METADATA_TYPE_VORBIS_COMMENT;
		vorbiscomment.length = (4 + vendor_string_length) + 4;
		vorbiscomment.data.vorbis_comment.vendor_string.length = vendor_string_length;
		vorbiscomment.data.vorbis_comment.vendor_string.entry = (FLAC__byte*)malloc_or_die_(vendor_string_length+1);
		memcpy(vorbiscomment.data.vorbis_comment.vendor_string.entry, FLAC__VENDOR_STRING, vendor_string_length+1);
		vorbiscomment.data.vorbis_comment.num_comments = 0;
		vorbiscomment.data.vorbis_comment.comments = 0;
	}

	{
		if (0 == (cuesheet = ::FLAC__metadata_object_new(::FLAC__METADATA_TYPE_CUESHEET)))
			return die_("priming our metadata");
		cuesheet->is_last = false;
		safe_strncpy(cuesheet->data.cue_sheet.media_catalog_number, "bogo-MCN", sizeof(cuesheet->data.cue_sheet.media_catalog_number));
		cuesheet->data.cue_sheet.lead_in = 123;
		cuesheet->data.cue_sheet.is_cd = false;
		if (!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, 0))
			return die_("priming our metadata");
		cuesheet->data.cue_sheet.tracks[0].number = 1;
		if (!FLAC__metadata_object_cuesheet_track_insert_blank_index(cuesheet, 0, 0))
			return die_("priming our metadata");
	}

	{
		picture.is_last = false;
		picture.type = ::FLAC__METADATA_TYPE_PICTURE;
		picture.length =
			(
				FLAC__STREAM_METADATA_PICTURE_TYPE_LEN +
				FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN + /* will add the length for the string later */
				FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN + /* will add the length for the string later */
				FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN +
				FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN +
				FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN +
				FLAC__STREAM_METADATA_PICTURE_COLORS_LEN +
				FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN /* will add the length for the data later */
			) / 8
		;
		picture.data.picture.type = ::FLAC__STREAM_METADATA_PICTURE_TYPE_FRONT_COVER;
		picture.data.picture.mime_type = strdup_or_die_("image/jpeg");
		picture.length += strlen(picture.data.picture.mime_type);
		picture.data.picture.description = (FLAC__byte*)strdup_or_die_("desc");
		picture.length += strlen((const char *)picture.data.picture.description);
		picture.data.picture.width = 300;
		picture.data.picture.height = 300;
		picture.data.picture.depth = 24;
		picture.data.picture.colors = 0;
		picture.data.picture.data = (FLAC__byte*)strdup_or_die_("SOMEJPEGDATA");
		picture.data.picture.data_length = strlen((const char *)picture.data.picture.data);
		picture.length += picture.data.picture.data_length;
	}

	padding.is_last = true;
	padding.type = ::FLAC__METADATA_TYPE_PADDING;
	padding.length = 1234;

	metadata[n++] = &vorbiscomment;
	if(include_extras) {
		metadata[n++] = cuesheet;
		metadata[n++] = &picture;
	}
	metadata[n++] = &padding;

	FLAC::Metadata::StreamInfo s(&streaminfo);
	FLAC::Metadata::VorbisComment v(&vorbiscomment);
	FLAC::Metadata::CueSheet c(cuesheet, /*copy=*/false);
	FLAC::Metadata::Picture pi(&picture);
	FLAC::Metadata::Padding p(&padding);
	if(
		!insert_to_our_metadata_(&s, i++, /*copy=*/true) ||
		!insert_to_our_metadata_(&v, i++, /*copy=*/true) ||
		(include_extras && !insert_to_our_metadata_(&c, i++, /*copy=*/true)) ||
		(include_extras && !insert_to_our_metadata_(&pi, i++, /*copy=*/true)) ||
		!insert_to_our_metadata_(&p, i++, /*copy=*/true)
	)
		return die_("priming our metadata");

	if(!file_utils__generate_flacfile(is_ogg, flacfilename(is_ogg), 0, 512 * 1024, &streaminfo, metadata, n))
		return die_("creating the encoded file");

	free(vorbiscomment.data.vorbis_comment.vendor_string.entry);
	free(picture.data.picture.mime_type);
	free(picture.data.picture.description);
	free(picture.data.picture.data);

	return true;
}

static bool test_file_(bool is_ogg, bool ignore_metadata)
{
	const char *filename = flacfilename(is_ogg);
	OurFileDecoder decoder(ignore_metadata);

	mc_our_block_number_ = 0;
	decoder.error_occurred_ = false;

	printf("\ttesting '%s'... ", filename);
	fflush(stdout);

	if(!decoder.is_valid())
		return die_("couldn't allocate decoder instance");

	decoder.set_md5_checking(true);
	decoder.set_metadata_respond_all();
	if((is_ogg? decoder.init_ogg(filename) : decoder.init(filename)) != ::FLAC__STREAM_DECODER_INIT_STATUS_OK) {
		(void)decoder.finish();
		return die_("initializing decoder\n");
	}
	if(!decoder.process_until_end_of_stream()) {
		(void)decoder.finish();
		return die_("decoding file\n");
	}

	(void)decoder.finish();

	if(decoder.error_occurred_)
		return false;

	if(mc_our_block_number_ != our_metadata_.num_blocks)
		return die_("short metadata block count");

	printf("PASSED\n");
	return true;
}

static bool change_stats_(const char *filename, bool read_only)
{
	if(!grabbag__file_change_stats(filename, read_only))
		return die_("during grabbag__file_change_stats()");

	return true;
}

static bool remove_file_(const char *filename)
{
	while(our_metadata_.num_blocks > 0)
		delete_from_our_metadata_(0);

	if(!grabbag__file_remove_file(filename))
		return die_("removing file");

	return true;
}

static bool test_level_0_()
{
	FLAC::Metadata::StreamInfo streaminfo;

	printf("\n\n++++++ testing level 0 interface\n");

	if(!generate_file_(/*include_extras=*/true, /*is_ogg=*/false))
		return false;

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/true))
		return false;

	printf("testing FLAC::Metadata::get_streaminfo()... ");

	if(!FLAC::Metadata::get_streaminfo(flacfilename(/*is_ogg=*/false), streaminfo))
		return die_("during FLAC::Metadata::get_streaminfo()");

	/* check to see if some basic data matches (c.f. generate_file_()) */
	if(streaminfo.get_channels() != 1)
		return die_("mismatch in streaminfo.get_channels()");
	if(streaminfo.get_bits_per_sample() != 8)
		return die_("mismatch in streaminfo.get_bits_per_sample()");
	if(streaminfo.get_sample_rate() != 44100)
		return die_("mismatch in streaminfo.get_sample_rate()");
	if(streaminfo.get_min_blocksize() != 576)
		return die_("mismatch in streaminfo.get_min_blocksize()");
	if(streaminfo.get_max_blocksize() != 576)
		return die_("mismatch in streaminfo.get_max_blocksize()");

	printf("OK\n");

	{
		printf("testing FLAC::Metadata::get_tags(VorbisComment *&)... ");

		FLAC::Metadata::VorbisComment *tags = 0;

		if(!FLAC::Metadata::get_tags(flacfilename(/*is_ogg=*/false), tags))
			return die_("during FLAC::Metadata::get_tags()");

		/* check to see if some basic data matches (c.f. generate_file_()) */
		if(tags->get_num_comments() != 0)
			return die_("mismatch in tags->get_num_comments()");

		printf("OK\n");

		delete tags;
	}

	{
		printf("testing FLAC::Metadata::get_tags(VorbisComment &)... ");

		FLAC::Metadata::VorbisComment tags;

		if(!FLAC::Metadata::get_tags(flacfilename(/*is_ogg=*/false), tags))
			return die_("during FLAC::Metadata::get_tags()");

		/* check to see if some basic data matches (c.f. generate_file_()) */
		if(tags.get_num_comments() != 0)
			return die_("mismatch in tags.get_num_comments()");

		printf("OK\n");
	}

	{
		printf("testing FLAC::Metadata::get_cuesheet(CueSheet *&)... ");

		FLAC::Metadata::CueSheet *cuesheet = 0;

		if(!FLAC::Metadata::get_cuesheet(flacfilename(/*is_ogg=*/false), cuesheet))
			return die_("during FLAC::Metadata::get_cuesheet()");

		/* check to see if some basic data matches (c.f. generate_file_()) */
		if(cuesheet->get_lead_in() != 123)
			return die_("mismatch in cuesheet->get_lead_in()");

		printf("OK\n");

		delete cuesheet;
	}

	{
		printf("testing FLAC::Metadata::get_cuesheet(CueSheet &)... ");

		FLAC::Metadata::CueSheet cuesheet;

		if(!FLAC::Metadata::get_cuesheet(flacfilename(/*is_ogg=*/false), cuesheet))
			return die_("during FLAC::Metadata::get_cuesheet()");

		/* check to see if some basic data matches (c.f. generate_file_()) */
		if(cuesheet.get_lead_in() != 123)
			return die_("mismatch in cuesheet.get_lead_in()");

		printf("OK\n");
	}

	{
		printf("testing FLAC::Metadata::get_picture(Picture *&)... ");

		FLAC::Metadata::Picture *picture = 0;

		if(!FLAC::Metadata::get_picture(flacfilename(/*is_ogg=*/false), picture, /*type=*/(::FLAC__StreamMetadata_Picture_Type)(-1), /*mime_type=*/0, /*description=*/0, /*max_width=*/(uint32_t)(-1), /*max_height=*/(uint32_t)(-1), /*max_depth=*/(uint32_t)(-1), /*max_colors=*/(uint32_t)(-1)))
			return die_("during FLAC::Metadata::get_picture()");

		/* check to see if some basic data matches (c.f. generate_file_()) */
		if(picture->get_type () != ::FLAC__STREAM_METADATA_PICTURE_TYPE_FRONT_COVER)
			return die_("mismatch in picture->get_type ()");

		printf("OK\n");

		delete picture;
	}

	{
		printf("testing FLAC::Metadata::get_picture(Picture &)... ");

		FLAC::Metadata::Picture picture;

		if(!FLAC::Metadata::get_picture(flacfilename(/*is_ogg=*/false), picture, /*type=*/(::FLAC__StreamMetadata_Picture_Type)(-1), /*mime_type=*/0, /*description=*/0, /*max_width=*/(uint32_t)(-1), /*max_height=*/(uint32_t)(-1), /*max_depth=*/(uint32_t)(-1), /*max_colors=*/(uint32_t)(-1)))
			return die_("during FLAC::Metadata::get_picture()");

		/* check to see if some basic data matches (c.f. generate_file_()) */
		if(picture.get_type () != ::FLAC__STREAM_METADATA_PICTURE_TYPE_FRONT_COVER)
			return die_("mismatch in picture->get_type ()");

		printf("OK\n");
	}

	if(!remove_file_(flacfilename(/*is_ogg=*/false)))
		return false;

	return true;
}

static bool test_level_1_()
{
	FLAC::Metadata::Prototype *block;
	FLAC::Metadata::StreamInfo *streaminfo;
	FLAC::Metadata::Padding *padding;
	FLAC::Metadata::Application *app;
	FLAC__byte data[1000];
	uint32_t our_current_position = 0;

	// initialize 'data' to avoid Valgrind errors
	memset(data, 0, sizeof(data));

	printf("\n\n++++++ testing level 1 interface\n");

	/************************************************************/
	{
	printf("simple iterator on read-only file\n");

	if(!generate_file_(/*include_extras=*/false, /*is_ogg=*/false))
		return false;

	if(!change_stats_(flacfilename(/*is_ogg=*/false), /*read_only=*/true))
		return false;

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/true))
		return false;

	FLAC::Metadata::SimpleIterator iterator;

	if(!iterator.is_valid())
		return die_("iterator.is_valid() returned false");

	if(!iterator.init(flacfilename(/*is_ogg=*/false), /*read_only=*/false, /*preserve_file_stats=*/false))
		return die_("iterator.init() returned false");

	printf("is writable = %u\n", (uint32_t)iterator.is_writable());
	if(iterator.is_writable())
		return die_("iterator claims file is writable when tester thinks it should not be; are you running as root?\n");

	printf("iterate forwards\n");

	if(iterator.get_block_type() != ::FLAC__METADATA_TYPE_STREAMINFO)
		return die_("expected STREAMINFO type from iterator.get_block_type()");
	if(0 == (block = iterator.get_block()))
		return die_("getting block 0");
	if(block->get_type() != ::FLAC__METADATA_TYPE_STREAMINFO)
		return die_("expected STREAMINFO type");
	if(block->get_is_last())
		return die_("expected is_last to be false");
	if(block->get_length() != FLAC__STREAM_METADATA_STREAMINFO_LENGTH)
		return die_("bad STREAMINFO length");
	/* check to see if some basic data matches (c.f. generate_file_()) */
	streaminfo = dynamic_cast<FLAC::Metadata::StreamInfo *>(block);
	FLAC__ASSERT(0 != streaminfo);
	if(streaminfo->get_channels() != 1)
		return die_("mismatch in channels");
	if(streaminfo->get_bits_per_sample() != 8)
		return die_("mismatch in bits_per_sample");
	if(streaminfo->get_sample_rate() != 44100)
		return die_("mismatch in sample_rate");
	if(streaminfo->get_min_blocksize() != 576)
		return die_("mismatch in min_blocksize");
	if(streaminfo->get_max_blocksize() != 576)
		return die_("mismatch in max_blocksize");
	// we will delete streaminfo a little later when we're really done with it...

	if(!iterator.next())
		return die_("forward iterator ended early");
	our_current_position++;

	if(!iterator.next())
		return die_("forward iterator ended early");
	our_current_position++;

	if(iterator.get_block_type() != ::FLAC__METADATA_TYPE_PADDING)
		return die_("expected PADDING type from iterator.get_block_type()");
	if(0 == (block = iterator.get_block()))
		return die_("getting block 1");
	if(block->get_type() != ::FLAC__METADATA_TYPE_PADDING)
		return die_("expected PADDING type");
	if(!block->get_is_last())
		return die_("expected is_last to be true");
	/* check to see if some basic data matches (c.f. generate_file_()) */
	if(block->get_length() != 1234)
		return die_("bad PADDING length");
	delete block;

	if(iterator.next())
		return die_("forward iterator returned true but should have returned false");

	printf("iterate backwards\n");
	if(!iterator.prev())
		return die_("reverse iterator ended early");
	if(!iterator.prev())
		return die_("reverse iterator ended early");
	if(iterator.prev())
		return die_("reverse iterator returned true but should have returned false");

	printf("testing iterator.set_block() on read-only file...\n");

	if(!iterator.set_block(streaminfo, false))
		printf("PASSED.  iterator.set_block() returned false like it should\n");
	else
		return die_("iterator.set_block() returned true but shouldn't have");
	delete streaminfo;
	}

	/************************************************************/
	{
	printf("simple iterator on writable file\n");

	if(!change_stats_(flacfilename(/*is_ogg=*/false), /*read-only=*/false))
		return false;

	printf("creating APPLICATION block\n");

	if(0 == (app = new FLAC::Metadata::Application()))
		return die_("new FLAC::Metadata::Application()");
	app->set_id((const uint8_t *)"duh");

	printf("creating PADDING block\n");

	if(0 == (padding = new FLAC::Metadata::Padding())) {
		delete app;
		return die_("new FLAC::Metadata::Padding()");
	}
	padding->set_length(20);

	FLAC::Metadata::SimpleIterator iterator;

	if(!iterator.is_valid()) {
		delete app;
		delete padding;
		return die_("iterator.is_valid() returned false");
	}

	if(!iterator.init(flacfilename(/*is_ogg=*/false), /*read_only=*/false, /*preserve_file_stats=*/false)) {
		delete app;
		delete padding;
		return die_("iterator.init() returned false");
	}
	our_current_position = 0;

	printf("is writable = %u\n", (uint32_t)iterator.is_writable());

	printf("[S]VP\ttry to write over STREAMINFO block...\n");
	if(!iterator.set_block(app, false))
		printf("\titerator.set_block() returned false like it should\n");
	else {
		delete app;
		delete padding;
		return die_("iterator.set_block() returned true but shouldn't have");
	}

        if(iterator.status() != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT)
                return die_("iterator.status() should have been FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT");

	printf("[S]VP\tnext\n");
	if(!iterator.next()) {
		delete app;
		delete padding;
		return die_("iterator ended early\n");
	}
	our_current_position++;

	printf("S[V]P\tnext\n");
	if(!iterator.next()) {
		delete app;
		delete padding;
		return die_("iterator ended early\n");
	}
	our_current_position++;

	printf("SV[P]\tinsert PADDING after, don't expand into padding\n");
	padding->set_length(25);
	if(!iterator.insert_block_after(padding, false))
		return die_ss_("iterator.insert_block_after(padding, false)", iterator);
	if(!insert_to_our_metadata_(padding, ++our_current_position, /*copy=*/true))
		return false;

	printf("SVP[P]\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("SV[P]P\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("S[V]PP\tinsert PADDING after, don't expand into padding\n");
	padding->set_length(30);
	if(!iterator.insert_block_after(padding, false))
		return die_ss_("iterator.insert_block_after(padding, false)", iterator);
	if(!insert_to_our_metadata_(padding, ++our_current_position, /*copy=*/true))
		return false;

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[P]PP\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("S[V]PPP\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("[S]VPPP\tdelete (STREAMINFO block), must fail\n");
	if(iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false) should have returned false", iterator);

        if(iterator.status() != FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT)
                return die_("iterator.status() should have been FLAC__METADATA_SIMPLE_ITERATOR_STATUS_ILLEGAL_INPUT");

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("[S]VPPP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("S[V]PPP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SV[P]PP\tdelete (middle block), replace with padding\n");
	if(!iterator.delete_block(true))
		return die_ss_("iterator.delete_block(true)", iterator);
	our_current_position--;

	printf("S[V]PPP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SV[P]PP\tdelete (middle block), don't replace with padding\n");
	if(!iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false)", iterator);
	delete_from_our_metadata_(our_current_position--);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("S[V]PP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SV[P]P\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SVP[P]\tdelete (last block), replace with padding\n");
	if(!iterator.delete_block(true))
		return die_ss_("iterator.delete_block(false)", iterator);
	our_current_position--;

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[P]P\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SVP[P]\tdelete (last block), don't replace with padding\n");
	if(!iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false)", iterator);
	delete_from_our_metadata_(our_current_position--);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[P]\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("S[V]P\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("[S]VP\tset STREAMINFO (change sample rate)\n");
	FLAC__ASSERT(our_current_position == 0);
	block = iterator.get_block();
	streaminfo = dynamic_cast<FLAC::Metadata::StreamInfo *>(block);
	FLAC__ASSERT(0 != streaminfo);
	streaminfo->set_sample_rate(32000);
	if(!replace_in_our_metadata_(block, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(block, false))
		return die_ss_("iterator.set_block(block, false)", iterator);
	delete block;

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("[S]VP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("S[V]P\tinsert APPLICATION after, expand into padding of exceeding size\n");
	app->set_id((const uint8_t *)"euh"); /* twiddle the id so that our comparison doesn't miss transposition */
	if(!iterator.insert_block_after(app, true))
		return die_ss_("iterator.insert_block_after(app, true)", iterator);
	if(!insert_to_our_metadata_(app, ++our_current_position, /*copy=*/true))
		return false;
	add_to_padding_length_(our_current_position+1, -((int)(FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) + (int)app->get_length()));

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]P\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SVA[P]\tset APPLICATION, expand into padding of exceeding size\n");
	app->set_id((const uint8_t *)"fuh"); /* twiddle the id */
	if(!iterator.set_block(app, true))
		return die_ss_("iterator.set_block(app, true)", iterator);
	if(!insert_to_our_metadata_(app, our_current_position, /*copy=*/true))
		return false;
	add_to_padding_length_(our_current_position+1, -((int)(FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) + (int)app->get_length()));

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVA[A]P\tset APPLICATION (grow), don't expand into padding\n");
	app->set_id((const uint8_t *)"guh"); /* twiddle the id */
	if(!app->set_data(data, sizeof(data), true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app, false))
		return die_ss_("iterator.set_block(app, false)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVA[A]P\tset APPLICATION (shrink), don't fill in with padding\n");
	app->set_id((const uint8_t *)"huh"); /* twiddle the id */
	if(!app->set_data(data, 12, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app, false))
		return die_ss_("iterator.set_block(app, false)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVA[A]P\tset APPLICATION (grow), expand into padding of exceeding size\n");
	app->set_id((const uint8_t *)"iuh"); /* twiddle the id */
	if(!app->set_data(data, sizeof(data), true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	add_to_padding_length_(our_current_position+1, -((int)sizeof(data) - 12));
	if(!iterator.set_block(app, true))
		return die_ss_("iterator.set_block(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVA[A]P\tset APPLICATION (shrink), fill in with padding\n");
	app->set_id((const uint8_t *)"juh"); /* twiddle the id */
	if(!app->set_data(data, 23, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!insert_to_our_metadata_(padding, our_current_position+1, /*copy=*/true))
		return die_("copying object");
	dynamic_cast<FLAC::Metadata::Padding *>(our_metadata_.blocks[our_current_position+1])->set_length(sizeof(data) - 23 - FLAC__STREAM_METADATA_HEADER_LENGTH);
	if(!iterator.set_block(app, true))
		return die_ss_("iterator.set_block(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVA[A]PP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SVAA[P]P\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SVAAP[P]\tset PADDING (shrink), don't fill in with padding\n");
	padding->set_length(5);
	if(!replace_in_our_metadata_(padding, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(padding, false))
		return die_ss_("iterator.set_block(padding, false)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVAAP[P]\tset APPLICATION (grow)\n");
	app->set_id((const uint8_t *)"kuh"); /* twiddle the id */
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app, false))
		return die_ss_("iterator.set_block(app, false)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVAAP[A]\tset PADDING (equal)\n");
	padding->set_length(27);
	if(!replace_in_our_metadata_(padding, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(padding, false))
		return die_ss_("iterator.set_block(padding, false)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVAAP[P]\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("SVAA[P]P\tdelete (middle block), don't replace with padding\n");
	if(!iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false)", iterator);
	delete_from_our_metadata_(our_current_position--);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVA[A]P\tdelete (middle block), don't replace with padding\n");
	if(!iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false)", iterator);
	delete_from_our_metadata_(our_current_position--);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]P\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SVA[P]\tinsert PADDING after\n");
	padding->set_length(5);
	if(!iterator.insert_block_after(padding, false))
		return die_ss_("iterator.insert_block_after(padding, false)", iterator);
	if(!insert_to_our_metadata_(padding, ++our_current_position, /*copy=*/true))
		return false;

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVAP[P]\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("SVA[P]P\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("SV[A]PP\tset APPLICATION (grow), try to expand into padding which is too small\n");
	if(!app->set_data(data, 32, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app, true))
		return die_ss_("iterator.set_block(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]PP\tset APPLICATION (grow), try to expand into padding which is 'close' but still too small\n");
	if(!app->set_data(data, 60, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app, true))
		return die_ss_("iterator.set_block(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]PP\tset APPLICATION (grow), expand into padding which will leave 0-length pad\n");
	if(!app->set_data(data, 87, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	dynamic_cast<FLAC::Metadata::Padding *>(our_metadata_.blocks[our_current_position+1])->set_length(0);
	if(!iterator.set_block(app, true))
		return die_ss_("iterator.set_block(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]PP\tset APPLICATION (grow), expand into padding which is exactly consumed\n");
	if(!app->set_data(data, 91, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	delete_from_our_metadata_(our_current_position+1);
	if(!iterator.set_block(app, true))
		return die_ss_("iterator.set_block(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]P\tset APPLICATION (grow), expand into padding which is exactly consumed\n");
	if(!app->set_data(data, 100, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	delete_from_our_metadata_(our_current_position+1);
	our_metadata_.blocks[our_current_position]->set_is_last(true);
	if(!iterator.set_block(app, true))
		return die_ss_("iterator.set_block(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]\tset PADDING (equal size)\n");
	padding->set_length(app->get_length());
	if(!replace_in_our_metadata_(padding, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(padding, true))
		return die_ss_("iterator.set_block(padding, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[P]\tinsert PADDING after\n");
	if(!iterator.insert_block_after(padding, false))
		return die_ss_("iterator.insert_block_after(padding, false)", iterator);
	if(!insert_to_our_metadata_(padding, ++our_current_position, /*copy=*/true))
		return false;

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVP[P]\tinsert PADDING after\n");
	padding->set_length(5);
	if(!iterator.insert_block_after(padding, false))
		return die_ss_("iterator.insert_block_after(padding, false)", iterator);
	if(!insert_to_our_metadata_(padding, ++our_current_position, /*copy=*/true))
		return false;

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SVPP[P]\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("SVP[P]P\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("SV[P]PP\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("S[V]PPP\tinsert APPLICATION after, try to expand into padding which is too small\n");
	if(!app->set_data(data, 101, true))
		return die_("setting APPLICATION data");
	if(!insert_to_our_metadata_(app, ++our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.insert_block_after(app, true))
		return die_ss_("iterator.insert_block_after(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]PPP\tdelete (middle block), don't replace with padding\n");
	if(!iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false)", iterator);
	delete_from_our_metadata_(our_current_position--);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("S[V]PPP\tinsert APPLICATION after, try to expand into padding which is 'close' but still too small\n");
	if(!app->set_data(data, 97, true))
		return die_("setting APPLICATION data");
	if(!insert_to_our_metadata_(app, ++our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.insert_block_after(app, true))
		return die_ss_("iterator.insert_block_after(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]PPP\tdelete (middle block), don't replace with padding\n");
	if(!iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false)", iterator);
	delete_from_our_metadata_(our_current_position--);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("S[V]PPP\tinsert APPLICATION after, expand into padding which is exactly consumed\n");
	if(!app->set_data(data, 100, true))
		return die_("setting APPLICATION data");
	if(!insert_to_our_metadata_(app, ++our_current_position, /*copy=*/true))
		return die_("copying object");
	delete_from_our_metadata_(our_current_position+1);
	if(!iterator.insert_block_after(app, true))
		return die_ss_("iterator.insert_block_after(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]PP\tdelete (middle block), don't replace with padding\n");
	if(!iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false)", iterator);
	delete_from_our_metadata_(our_current_position--);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("S[V]PP\tinsert APPLICATION after, expand into padding which will leave 0-length pad\n");
	if(!app->set_data(data, 96, true))
		return die_("setting APPLICATION data");
	if(!insert_to_our_metadata_(app, ++our_current_position, /*copy=*/true))
		return die_("copying object");
	dynamic_cast<FLAC::Metadata::Padding *>(our_metadata_.blocks[our_current_position+1])->set_length(0);
	if(!iterator.insert_block_after(app, true))
		return die_ss_("iterator.insert_block_after(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]PP\tdelete (middle block), don't replace with padding\n");
	if(!iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false)", iterator);
	delete_from_our_metadata_(our_current_position--);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("S[V]PP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SV[P]P\tdelete (middle block), don't replace with padding\n");
	if(!iterator.delete_block(false))
		return die_ss_("iterator.delete_block(false)", iterator);
	delete_from_our_metadata_(our_current_position--);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;

	printf("S[V]P\tinsert APPLICATION after, expand into padding which is exactly consumed\n");
	if(!app->set_data(data, 1, true))
		return die_("setting APPLICATION data");
	if(!insert_to_our_metadata_(app, ++our_current_position, /*copy=*/true))
		return die_("copying object");
	delete_from_our_metadata_(our_current_position+1);
	if(!iterator.insert_block_after(app, true))
		return die_ss_("iterator.insert_block_after(app, true)", iterator);

	if(!test_file_(/*is_ogg=*/false, /*ignore_metadata=*/false))
		return false;
	}

	delete app;
	delete padding;

	if(!remove_file_(flacfilename(/*is_ogg=*/false)))
		return false;

	return true;
}

static bool test_level_2_(bool filename_based, bool is_ogg)
{
	FLAC::Metadata::Prototype *block;
	FLAC::Metadata::StreamInfo *streaminfo;
	FLAC::Metadata::Application *app;
	FLAC::Metadata::Padding *padding;
	FLAC__byte data[2000];
	uint32_t our_current_position;

	// initialize 'data' to avoid Valgrind errors
	memset(data, 0, sizeof(data));

	printf("\n\n++++++ testing level 2 interface (%s-based, %s FLAC)\n", filename_based? "filename":"callback", is_ogg? "Ogg":"native");

	printf("generate read-only file\n");

	if(!generate_file_(/*include_extras=*/false, is_ogg))
		return false;

	if(!change_stats_(flacfilename(is_ogg), /*read_only=*/true))
		return false;

	printf("create chain\n");
	FLAC::Metadata::Chain chain;
	if(!chain.is_valid())
		return die_("allocating memory for chain");

	printf("read chain\n");

	if(!read_chain_(chain, flacfilename(is_ogg), filename_based, is_ogg))
		return die_c_("reading chain", chain.status());

	printf("[S]VP\ttest initial metadata\n");

	if(!compare_chain_(chain, 0, 0))
		return false;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	if(is_ogg)
		goto end;

	printf("switch file to read-write\n");

	if(!change_stats_(flacfilename(is_ogg), /*read-only=*/false))
		return false;

	printf("create iterator\n");
	{
	FLAC::Metadata::Iterator iterator;
	if(!iterator.is_valid())
		return die_("allocating memory for iterator");

	our_current_position = 0;

	iterator.init(chain);

	if(0 == (block = iterator.get_block()))
		return die_("getting block from iterator");

	FLAC__ASSERT(block->get_type() == FLAC__METADATA_TYPE_STREAMINFO);

	printf("[S]VP\tmodify STREAMINFO, write\n");

	streaminfo = dynamic_cast<FLAC::Metadata::StreamInfo *>(block);
	FLAC__ASSERT(0 != streaminfo);
	streaminfo->set_sample_rate(32000);
	if(!replace_in_our_metadata_(block, our_current_position, /*copy=*/true))
		return die_("copying object");
	delete block;

	if(!write_chain_(chain, /*use_padding=*/false, /*preserve_file_stats=*/true, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(false, true)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("[S]VP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("S[V]P\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SV[P]\treplace PADDING with identical-size APPLICATION\n");
	if(0 == (block = iterator.get_block()))
		return die_("getting block from iterator");
	if(0 == (app = new FLAC::Metadata::Application()))
		return die_("new FLAC::Metadata::Application()");
	app->set_id((const uint8_t *)"duh");
	if(!app->set_data(data, block->get_length()-(FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), true))
		return die_("setting APPLICATION data");
	delete block;
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/false, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(false, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]\tshrink APPLICATION, don't use padding\n");
	if(0 == (app = dynamic_cast<FLAC::Metadata::Application *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("copying object");
	if(!app->set_data(data, 26, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/false, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(false, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]\tgrow APPLICATION, don't use padding\n");
	if(0 == (app = dynamic_cast<FLAC::Metadata::Application *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("copying object");
	if(!app->set_data(data, 28, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/false, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(false, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]\tgrow APPLICATION, use padding, but last block is not padding\n");
	if(0 == (app = dynamic_cast<FLAC::Metadata::Application *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("copying object");
	if(!app->set_data(data, 36, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/false, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(false, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]\tshrink APPLICATION, use padding, last block is not padding, but delta is too small for new PADDING block\n");
	if(0 == (app = dynamic_cast<FLAC::Metadata::Application *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("copying object");
	if(!app->set_data(data, 33, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/true, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(true, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]\tshrink APPLICATION, use padding, last block is not padding, delta is enough for new PADDING block\n");
	if(0 == (padding = new FLAC::Metadata::Padding()))
		return die_("creating PADDING block");
	if(0 == (app = dynamic_cast<FLAC::Metadata::Application *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("copying object");
	if(!app->set_data(data, 29, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	padding->set_length(0);
	if(!insert_to_our_metadata_(padding, our_current_position+1, /*copy=*/false))
		return die_("internal error");
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/true, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(true, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]P\tshrink APPLICATION, use padding, last block is padding\n");
	if(0 == (app = dynamic_cast<FLAC::Metadata::Application *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("copying object");
	if(!app->set_data(data, 16, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	dynamic_cast<FLAC::Metadata::Padding *>(our_metadata_.blocks[our_current_position+1])->set_length(13);
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/true, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(true, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]P\tgrow APPLICATION, use padding, last block is padding, but delta is too small\n");
	if(0 == (app = dynamic_cast<FLAC::Metadata::Application *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("copying object");
	if(!app->set_data(data, 50, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/true, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(true, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]P\tgrow APPLICATION, use padding, last block is padding of exceeding size\n");
	if(0 == (app = dynamic_cast<FLAC::Metadata::Application *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("copying object");
	if(!app->set_data(data, 56, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	add_to_padding_length_(our_current_position+1, -(56 - 50));
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/true, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(true, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]P\tgrow APPLICATION, use padding, last block is padding of exact size\n");
	if(0 == (app = dynamic_cast<FLAC::Metadata::Application *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("copying object");
	if(!app->set_data(data, 67, true))
		return die_("setting APPLICATION data");
	if(!replace_in_our_metadata_(app, our_current_position, /*copy=*/true))
		return die_("copying object");
	delete_from_our_metadata_(our_current_position+1);
	if(!iterator.set_block(app))
		return die_c_("iterator.set_block(app)", chain.status());

	if(!write_chain_(chain, /*use_padding=*/true, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(true, false)", chain.status());
	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV[A]\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("S[V]A\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("[S]VA\tinsert PADDING before STREAMINFO (should fail)\n");
	if(0 == (padding = new FLAC::Metadata::Padding()))
		return die_("creating PADDING block");
	padding->set_length(30);
	if(!iterator.insert_block_before(padding))
		printf("\titerator.insert_block_before() returned false like it should\n");
	else
		return die_("iterator.insert_block_before() should have returned false");

	printf("[S]VA\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("S[V]A\tinsert PADDING after\n");
	if(!insert_to_our_metadata_(padding, ++our_current_position, /*copy=*/true))
		return die_("copying metadata");
	if(!iterator.insert_block_after(padding))
		return die_("iterator.insert_block_after(padding)");

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	printf("SV[P]A\tinsert PADDING before\n");
	if(0 == (padding = dynamic_cast<FLAC::Metadata::Padding *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("creating PADDING block");
	padding->set_length(17);
	if(!insert_to_our_metadata_(padding, our_current_position, /*copy=*/true))
		return die_("copying metadata");
	if(!iterator.insert_block_before(padding))
		return die_("iterator.insert_block_before(padding)");

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	printf("SV[P]PA\tinsert PADDING before\n");
	if(0 == (padding = dynamic_cast<FLAC::Metadata::Padding *>(FLAC::Metadata::clone(our_metadata_.blocks[our_current_position]))))
		return die_("creating PADDING block");
	padding->set_length(0);
	if(!insert_to_our_metadata_(padding, our_current_position, /*copy=*/true))
		return die_("copying metadata");
	if(!iterator.insert_block_before(padding))
		return die_("iterator.insert_block_before(padding)");

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	printf("SV[P]PPA\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SVP[P]PA\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SVPP[P]A\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SVPPP[A]\tinsert PADDING after\n");
	if(0 == (padding = dynamic_cast<FLAC::Metadata::Padding *>(FLAC::Metadata::clone(our_metadata_.blocks[2]))))
		return die_("creating PADDING block");
	padding->set_length(57);
	if(!insert_to_our_metadata_(padding, ++our_current_position, /*copy=*/true))
		return die_("copying metadata");
	if(!iterator.insert_block_after(padding))
		return die_("iterator.insert_block_after(padding)");

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	printf("SVPPPA[P]\tinsert PADDING before\n");
	if(0 == (padding = dynamic_cast<FLAC::Metadata::Padding *>(FLAC::Metadata::clone(our_metadata_.blocks[2]))))
		return die_("creating PADDING block");
	padding->set_length(99);
	if(!insert_to_our_metadata_(padding, our_current_position, /*copy=*/true))
		return die_("copying metadata");
	if(!iterator.insert_block_before(padding))
		return die_("iterator.insert_block_before(padding)");

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	}
	our_current_position = 0;

	printf("SVPPPAPP\tmerge padding\n");
	chain.merge_padding();
	add_to_padding_length_(2, FLAC__STREAM_METADATA_HEADER_LENGTH + our_metadata_.blocks[3]->get_length());
	add_to_padding_length_(2, FLAC__STREAM_METADATA_HEADER_LENGTH + our_metadata_.blocks[4]->get_length());
	add_to_padding_length_(6, FLAC__STREAM_METADATA_HEADER_LENGTH + our_metadata_.blocks[7]->get_length());
	delete_from_our_metadata_(7);
	delete_from_our_metadata_(4);
	delete_from_our_metadata_(3);

	if(!write_chain_(chain, /*use_padding=*/true, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(true, false)", chain.status());
	if(!compare_chain_(chain, 0, 0))
		return false;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SVPAP\tsort padding\n");
	chain.sort_padding();
	add_to_padding_length_(4, FLAC__STREAM_METADATA_HEADER_LENGTH + our_metadata_.blocks[2]->get_length());
	delete_from_our_metadata_(2);

	if(!write_chain_(chain, /*use_padding=*/true, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(true, false)", chain.status());
	if(!compare_chain_(chain, 0, 0))
		return false;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("create iterator\n");
	{
	FLAC::Metadata::Iterator iterator;
	if(!iterator.is_valid())
		return die_("allocating memory for iterator");

	our_current_position = 0;

	iterator.init(chain);

	printf("[S]VAP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("S[V]AP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SV[A]P\tdelete middle block, replace with padding\n");
	if(0 == (padding = new FLAC::Metadata::Padding()))
		return die_("creating PADDING block");
	padding->set_length(71);
	if(!replace_in_our_metadata_(padding, our_current_position--, /*copy=*/false))
		return die_("copying object");
	if(!iterator.delete_block(/*replace_with_padding=*/true))
		return die_c_("iterator.delete_block(true)", chain.status());

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	printf("S[V]PP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SV[P]P\tdelete middle block, don't replace with padding\n");
	delete_from_our_metadata_(our_current_position--);
	if(!iterator.delete_block(/*replace_with_padding=*/false))
		return die_c_("iterator.delete_block(false)", chain.status());

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	printf("S[V]P\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SV[P]\tdelete last block, replace with padding\n");
	if(0 == (padding = new FLAC::Metadata::Padding()))
		return die_("creating PADDING block");
	padding->set_length(219);
	if(!replace_in_our_metadata_(padding, our_current_position--, /*copy=*/false))
		return die_("copying object");
	if(!iterator.delete_block(/*replace_with_padding=*/true))
		return die_c_("iterator.delete_block(true)", chain.status());

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	printf("S[V]P\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");
	our_current_position++;

	printf("SV[P]\tdelete last block, don't replace with padding\n");
	delete_from_our_metadata_(our_current_position--);
	if(!iterator.delete_block(/*replace_with_padding=*/false))
		return die_c_("iterator.delete_block(false)", chain.status());

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	printf("S[V]\tprev\n");
	if(!iterator.prev())
		return die_("iterator ended early\n");
	our_current_position--;

	printf("[S]V\tdelete STREAMINFO block, should fail\n");
	if(iterator.delete_block(/*replace_with_padding=*/false))
		return die_("iterator.delete_block() on STREAMINFO should have failed but didn't");

	block = iterator.get_block();
	if(!compare_chain_(chain, our_current_position, block))
		return false;
	delete block;

	} // delete iterator
	our_current_position = 0;

	printf("SV\tmerge padding\n");
	chain.merge_padding();

	if(!write_chain_(chain, /*use_padding=*/false, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(false, false)", chain.status());
	if(!compare_chain_(chain, 0, 0))
		return false;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

	printf("SV\tsort padding\n");
	chain.sort_padding();

	if(!write_chain_(chain, /*use_padding=*/false, /*preserve_file_stats=*/false, filename_based, flacfilename(is_ogg)))
		return die_c_("during chain.write(false, false)", chain.status());
	if(!compare_chain_(chain, 0, 0))
		return false;
	if(!test_file_(is_ogg, /*ignore_metadata=*/false))
		return false;

end:
	if(!remove_file_(flacfilename(is_ogg)))
		return false;

	return true;
}

static bool test_level_2_misc_(bool is_ogg)
{
	::FLAC__IOCallbacks callbacks;

	memset(&callbacks, 0, sizeof(callbacks));
	callbacks.read = (::FLAC__IOCallback_Read)fread;
#ifdef FLAC__VALGRIND_TESTING
	callbacks.write = chain_write_cb_;
#else
	callbacks.write = (::FLAC__IOCallback_Write)fwrite;
#endif
	callbacks.seek = chain_seek_cb_;
	callbacks.tell = chain_tell_cb_;
	callbacks.eof = chain_eof_cb_;

	printf("\n\n++++++ testing level 2 interface (mismatched read/write protections)\n");

	printf("generate file\n");

	if(!generate_file_(/*include_extras=*/false, is_ogg))
		return false;

	printf("create chain\n");
	FLAC::Metadata::Chain chain;
	if(!chain.is_valid())
		return die_("allocating chain");

	printf("read chain (filename-based)\n");

	if(!chain.read(flacfilename(is_ogg)))
		return die_c_("reading chain", chain.status());

	printf("write chain with wrong method Chain::write(with callbacks)\n");
	{
		if(chain.write(/*use_padding=*/false, 0, callbacks))
			return die_c_("mismatched write should have failed", chain.status());
		if(chain.status() != ::FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH)
			return die_c_("expected FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH", chain.status());
		printf("  OK: Chain::write(with callbacks) returned false,FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH like it should\n");
	}

	printf("read chain (filename-based)\n");

	if(!chain.read(flacfilename(is_ogg)))
		return die_c_("reading chain", chain.status());

	printf("write chain with wrong method Chain::write(with callbacks and tempfile)\n");
	{
		if(chain.write(/*use_padding=*/false, 0, callbacks, 0, callbacks))
			return die_c_("mismatched write should have failed", chain.status());
		if(chain.status() != ::FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH)
			return die_c_("expected FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH", chain.status());
		printf("  OK: Chain::write(with callbacks and tempfile) returned false,FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH like it should\n");
	}

	printf("read chain (callback-based)\n");
	{
		FILE *file = flac_fopen(flacfilename(is_ogg), "rb");
		if(0 == file)
			return die_("opening file");
		if(!chain.read((::FLAC__IOHandle)file, callbacks)) {
			fclose(file);
			return die_c_("reading chain", chain.status());
		}
		fclose(file);
	}

	printf("write chain with wrong method write()\n");
	{
		if(chain.write(/*use_padding=*/false, /*preserve_file_stats=*/false))
			return die_c_("mismatched write should have failed", chain.status());
		if(chain.status() != ::FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH)
			return die_c_("expected FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH", chain.status());
		printf("  OK: write() returned false,FLAC__METADATA_CHAIN_STATUS_READ_WRITE_MISMATCH like it should\n");
	}

	printf("read chain (callback-based)\n");
	{
		FILE *file = flac_fopen(flacfilename(is_ogg), "rb");
		if(0 == file)
			return die_("opening file");
		if(!chain.read((::FLAC__IOHandle)file, callbacks)) {
			fclose(file);
			return die_c_("reading chain", chain.status());
		}
		fclose(file);
	}

	printf("testing Chain::check_if_tempfile_needed()... ");

	if(!chain.check_if_tempfile_needed(/*use_padding=*/false))
		printf("OK: Chain::check_if_tempfile_needed() returned false like it should\n");
	else
		return die_("Chain::check_if_tempfile_needed() returned true but shouldn't have");

	printf("write chain with wrong method Chain::write(with callbacks and tempfile)\n");
	{
		if(chain.write(/*use_padding=*/false, 0, callbacks, 0, callbacks))
			return die_c_("mismatched write should have failed", chain.status());
		if(chain.status() != ::FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL)
			return die_c_("expected FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL", chain.status());
		printf("  OK: Chain::write(with callbacks and tempfile) returned false,FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL like it should\n");
	}

	printf("read chain (callback-based)\n");
	{
		FILE *file = flac_fopen(flacfilename(is_ogg), "rb");
		if(0 == file)
			return die_("opening file");
		if(!chain.read((::FLAC__IOHandle)file, callbacks)) {
			fclose(file);
			return die_c_("reading chain", chain.status());
		}
		fclose(file);
	}

	printf("create iterator\n");
	{
	FLAC::Metadata::Iterator iterator;
	if(!iterator.is_valid())
		return die_("allocating memory for iterator");

	iterator.init(chain);

	printf("[S]VP\tnext\n");
	if(!iterator.next())
		return die_("iterator ended early\n");

	printf("S[V]P\tdelete VORBIS_COMMENT, write\n");
	if(!iterator.delete_block(/*replace_with_padding=*/false))
		return die_c_("block delete failed\n", chain.status());

	printf("testing Chain::check_if_tempfile_needed()... ");

	if(chain.check_if_tempfile_needed(/*use_padding=*/false))
		printf("OK: Chain::check_if_tempfile_needed() returned true like it should\n");
	else
		return die_("Chain::check_if_tempfile_needed() returned false but shouldn't have");

	printf("write chain with wrong method Chain::write(with callbacks)\n");
	{
		if(chain.write(/*use_padding=*/false, 0, callbacks))
			return die_c_("mismatched write should have failed", chain.status());
		if(chain.status() != ::FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL)
			return die_c_("expected FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL", chain.status());
		printf("  OK: Chain::write(with callbacks) returned false,FLAC__METADATA_CHAIN_STATUS_WRONG_WRITE_CALL like it should\n");
	}

	} // delete iterator

	if(!remove_file_(flacfilename(is_ogg)))
		return false;

	return true;
}

bool test_metadata_file_manipulation()
{
	printf("\n+++ libFLAC++ unit test: metadata manipulation\n\n");

	our_metadata_.num_blocks = 0;

	if(!test_level_0_())
		return false;

	if(!test_level_1_())
		return false;

	if(!test_level_2_(/*filename_based=*/true, /*is_ogg=*/false)) /* filename-based */
		return false;
	if(!test_level_2_(/*filename_based=*/false, /*is_ogg=*/false)) /* callback-based */
		return false;
	if(!test_level_2_misc_(/*is_ogg=*/false))
		return false;

	if(FLAC_API_SUPPORTS_OGG_FLAC) {
		if(!test_level_2_(/*filename_based=*/true, /*is_ogg=*/true)) /* filename-based */
			return false;
		if(!test_level_2_(/*filename_based=*/false, /*is_ogg=*/true)) /* callback-based */
			return false;
#if 0
		/* when ogg flac write is supported, will have to add this: */
		if(!test_level_2_misc_(/*is_ogg=*/true))
			return false;
#endif
	}

	return true;
}