1 /* 2 * This file is part of the flashrom project. 3 * 4 * Copyright (C) 2009 Carl-Daniel Hailfinger 5 * Copyright (C) 2022 secunet Security Networks AG 6 * (written by Thomas Heijligen <[email protected]) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; version 2 of the License. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 /* 19 * inline functions and macros shared by endian conversion functions 20 */ 21 22 #ifndef ___SWAP_H___ 23 #define ___SWAP_H___ 1 24 25 #include <stdint.h> 26 27 /* swap bytes */ 28 /* OpenBSD has conflicting definitions for swapX, _swap_X and __swapX */ ___swap8(const uint8_t value)29static inline uint8_t ___swap8(const uint8_t value) 30 { 31 return (value & (uint8_t)0xffU); 32 } 33 ___swap16(const uint16_t value)34static inline uint16_t ___swap16(const uint16_t value) 35 { 36 return ((value & (uint16_t)0x00ffU) << 8) | 37 ((value & (uint16_t)0xff00U) >> 8); 38 } 39 ___swap32(const uint32_t value)40static inline uint32_t ___swap32(const uint32_t value) 41 { 42 return ((value & (uint32_t)0x000000ffUL) << 24) | 43 ((value & (uint32_t)0x0000ff00UL) << 8) | 44 ((value & (uint32_t)0x00ff0000UL) >> 8) | 45 ((value & (uint32_t)0xff000000UL) >> 24); 46 } 47 ___swap64(const uint64_t value)48static inline uint64_t ___swap64(const uint64_t value) 49 { 50 return ((value & (uint64_t)0x00000000000000ffULL) << 56) | 51 ((value & (uint64_t)0x000000000000ff00ULL) << 40) | 52 ((value & (uint64_t)0x0000000000ff0000ULL) << 24) | 53 ((value & (uint64_t)0x00000000ff000000ULL) << 8) | 54 ((value & (uint64_t)0x000000ff00000000ULL) >> 8) | 55 ((value & (uint64_t)0x0000ff0000000000ULL) >> 24) | 56 ((value & (uint64_t)0x00ff000000000000ULL) >> 40) | 57 ((value & (uint64_t)0xff00000000000000ULL) >> 56); 58 } 59 60 /* 61 * macro to return the same value as passed. 62 * 63 * `___return_same(cpu_to_le, 8)` 64 * expands to 65 * `uint8_t cpu_to_le8 (const uint8_t value) { return value; }` 66 */ 67 #define ___return_same(name, bits) \ 68 uint##bits##_t name##bits (const uint##bits##_t value) { return value; } 69 70 /* 71 * macro to return the swapped value as passed. 72 * 73 * `___return_swapped(cpu_to_be, 8)` 74 * expands to 75 * `uint8_t cpu_to_be8 (const uint8_t value) { return ___swap8 (value); }` 76 */ 77 #define ___return_swapped(name, bits) \ 78 uint##bits##_t name##bits (const uint##bits##_t value) { return ___swap##bits (value); } 79 80 #endif /* !___SWAP_H___ */ 81