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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2009 Carl-Daniel Hailfinger
* Copyright (C) 2022 secunet Security Networks AG
* (written by Thomas Heijligen <thomas.heijligen@secunet.com)
*
* 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; version 2 of the License.
*
* 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.
*/
/*
* inline functions and macros shared by endian conversion functions
*/
#ifndef ___SWAP_H___
#define ___SWAP_H___ 1
#include <stdint.h>
/* swap bytes */
/* OpenBSD has conflicting definitions for swapX, _swap_X and __swapX */
static inline uint8_t ___swap8(const uint8_t value)
{
return (value & (uint8_t)0xffU);
}
static inline uint16_t ___swap16(const uint16_t value)
{
return ((value & (uint16_t)0x00ffU) << 8) |
((value & (uint16_t)0xff00U) >> 8);
}
static inline uint32_t ___swap32(const uint32_t value)
{
return ((value & (uint32_t)0x000000ffUL) << 24) |
((value & (uint32_t)0x0000ff00UL) << 8) |
((value & (uint32_t)0x00ff0000UL) >> 8) |
((value & (uint32_t)0xff000000UL) >> 24);
}
static inline uint64_t ___swap64(const uint64_t value)
{
return ((value & (uint64_t)0x00000000000000ffULL) << 56) |
((value & (uint64_t)0x000000000000ff00ULL) << 40) |
((value & (uint64_t)0x0000000000ff0000ULL) << 24) |
((value & (uint64_t)0x00000000ff000000ULL) << 8) |
((value & (uint64_t)0x000000ff00000000ULL) >> 8) |
((value & (uint64_t)0x0000ff0000000000ULL) >> 24) |
((value & (uint64_t)0x00ff000000000000ULL) >> 40) |
((value & (uint64_t)0xff00000000000000ULL) >> 56);
}
/*
* macro to return the same value as passed.
*
* `___return_same(cpu_to_le, 8)`
* expands to
* `uint8_t cpu_to_le8 (const uint8_t value) { return value; }`
*/
#define ___return_same(name, bits) \
uint##bits##_t name##bits (const uint##bits##_t value) { return value; }
/*
* macro to return the swapped value as passed.
*
* `___return_swapped(cpu_to_be, 8)`
* expands to
* `uint8_t cpu_to_be8 (const uint8_t value) { return ___swap8 (value); }`
*/
#define ___return_swapped(name, bits) \
uint##bits##_t name##bits (const uint##bits##_t value) { return ___swap##bits (value); }
#endif /* !___SWAP_H___ */
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