mirror of
https://github.com/libretro/RetroArch.git
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82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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* Copyright (C) 2011-2014 - Daniel De Matteis
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ENDIANNESS_H
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#define __ENDIANNESS_H
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#include <stdint.h>
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#define SWAP32(x) ((uint32_t)( \
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(((uint32_t)(x) & 0x000000ff) << 24) | \
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(((uint32_t)(x) & 0x0000ff00) << 8) | \
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(((uint32_t)(x) & 0x00ff0000) >> 8) | \
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(((uint32_t)(x) & 0xff000000) >> 24) \
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))
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static inline uint8_t is_little_endian(void)
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{
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union
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{
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uint16_t x;
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uint8_t y[2];
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} u;
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u.x = 1;
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return u.y[0];
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}
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static inline uint32_t swap_if_big32(uint32_t val)
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{
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if (is_little_endian())
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return val;
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return (val >> 24) | ((val >> 8) & 0xFF00) |
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((val << 8) & 0xFF0000) | (val << 24);
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}
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static inline uint32_t swap_if_little32(uint32_t val)
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{
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if (is_little_endian())
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return (val >> 24) | ((val >> 8) & 0xFF00) |
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((val << 8) & 0xFF0000) | (val << 24);
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return val;
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}
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static inline uint16_t swap_if_big16(uint16_t val)
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{
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if (is_little_endian())
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return val;
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return (val >> 8) | (val << 8);
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}
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static inline uint16_t swap_if_little16(uint16_t val)
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{
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if (is_little_endian())
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return (val >> 8) | (val << 8);
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return val;
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}
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static inline void store32be(uint32_t *addr, uint32_t data)
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{
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*addr = is_little_endian() ? SWAP32(data) : data;
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}
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static inline uint32_t load32be(const uint32_t *addr)
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{
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return is_little_endian() ? SWAP32(*addr) : *addr;
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}
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#endif
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