mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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247 lines
6.8 KiB
C
247 lines
6.8 KiB
C
/* Copyright (C) 2010-2017 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (retro_endianness.h).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __LIBRETRO_SDK_ENDIANNESS_H
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#define __LIBRETRO_SDK_ENDIANNESS_H
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#include <retro_inline.h>
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#include <stdint.h>
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#include <stdlib.h>
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#if defined(_MSC_VER)
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#define SWAP16 _byteswap_ushort
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#define SWAP32 _byteswap_ulong
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#else
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#define SWAP16(x) ((uint16_t)( \
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(((uint16_t)(x) & 0x00ff) << 8) | \
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(((uint16_t)(x) & 0xff00) >> 8) \
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))
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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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#endif
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#define SWAP64(val) \
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((((uint64_t)(val) & 0x00000000000000ffULL) << 56) \
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| (((uint64_t)(val) & 0x000000000000ff00ULL) << 40) \
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| (((uint64_t)(val) & 0x0000000000ff0000ULL) << 24) \
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| (((uint64_t)(val) & 0x00000000ff000000ULL) << 8) \
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| (((uint64_t)(val) & 0x000000ff00000000ULL) >> 8) \
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| (((uint64_t)(val) & 0x0000ff0000000000ULL) >> 24) \
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| (((uint64_t)(val) & 0x00ff000000000000ULL) >> 40) \
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| (((uint64_t)(val) & 0xff00000000000000ULL) >> 56))
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/**
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* is_little_endian:
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*
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* Checks if the system is little endian or big-endian.
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*
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* Returns: greater than 0 if little-endian,
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* otherwise big-endian.
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**/
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#if defined(MSB_FIRST)
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#define is_little_endian() (0)
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#elif defined(__x86_64) || defined(__i386) || defined(_M_IX86) || defined(_M_X64)
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#define is_little_endian() (1)
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#else
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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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#endif
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/**
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* swap_if_big64:
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* @val : unsigned 64-bit value
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*
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* Byteswap unsigned 64-bit value if system is big-endian.
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*
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* Returns: Byteswapped value in case system is big-endian,
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* otherwise returns same value.
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**/
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#if defined(MSB_FIRST)
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#define swap_if_big64(val) (SWAP64(val))
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#elif defined(__x86_64) || defined(__i386) || defined(_M_IX86) || defined(_M_X64)
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#define swap_if_big64(val) (val)
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#else
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static INLINE uint64_t swap_if_big64(uint64_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 SWAP64(val);
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}
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#endif
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/**
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* swap_if_big32:
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* @val : unsigned 32-bit value
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*
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* Byteswap unsigned 32-bit value if system is big-endian.
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*
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* Returns: Byteswapped value in case system is big-endian,
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* otherwise returns same value.
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**/
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#if defined(MSB_FIRST)
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#define swap_if_big32(val) (SWAP32(val))
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#elif defined(__x86_64) || defined(__i386) || defined(_M_IX86) || defined(_M_X64)
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#define swap_if_big32(val) (val)
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#else
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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 SWAP32(val);
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}
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#endif
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/**
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* swap_if_little64:
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* @val : unsigned 64-bit value
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*
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* Byteswap unsigned 64-bit value if system is little-endian.
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*
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* Returns: Byteswapped value in case system is little-endian,
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* otherwise returns same value.
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**/
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#if defined(MSB_FIRST)
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#define swap_if_little64(val) (val)
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#elif defined(__x86_64) || defined(__i386) || defined(_M_IX86) || defined(_M_X64)
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#define swap_if_little64(val) (SWAP64(val))
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#else
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static INLINE uint64_t swap_if_little64(uint64_t val)
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{
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if (is_little_endian())
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return SWAP64(val);
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return val;
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}
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#endif
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/**
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* swap_if_little32:
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* @val : unsigned 32-bit value
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*
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* Byteswap unsigned 32-bit value if system is little-endian.
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*
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* Returns: Byteswapped value in case system is little-endian,
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* otherwise returns same value.
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**/
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#if defined(MSB_FIRST)
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#define swap_if_little32(val) (val)
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#elif defined(__x86_64) || defined(__i386) || defined(_M_IX86) || defined(_M_X64)
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#define swap_if_little32(val) (SWAP32(val))
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#else
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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 SWAP32(val);
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return val;
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}
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#endif
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/**
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* swap_if_big16:
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* @val : unsigned 16-bit value
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*
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* Byteswap unsigned 16-bit value if system is big-endian.
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*
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* Returns: Byteswapped value in case system is big-endian,
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* otherwise returns same value.
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**/
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#if defined(MSB_FIRST)
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#define swap_if_big16(val) (SWAP16(val))
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#elif defined(__x86_64) || defined(__i386) || defined(_M_IX86) || defined(_M_X64)
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#define swap_if_big16(val) (val)
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#else
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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 SWAP16(val);
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}
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#endif
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/**
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* swap_if_little16:
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* @val : unsigned 16-bit value
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*
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* Byteswap unsigned 16-bit value if system is little-endian.
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*
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* Returns: Byteswapped value in case system is little-endian,
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* otherwise returns same value.
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**/
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#if defined(MSB_FIRST)
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#define swap_if_little16(val) (val)
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#elif defined(__x86_64) || defined(__i386) || defined(_M_IX86) || defined(_M_X64)
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#define swap_if_little16(val) (SWAP16(val))
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#else
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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 SWAP16(val);
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return val;
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}
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#endif
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/**
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* store32be:
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* @addr : pointer to unsigned 32-bit buffer
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* @data : unsigned 32-bit value to write
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*
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* Write data to address. Endian-safe. Byteswaps the data
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* first if necessary before storing it.
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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 = swap_if_little32(data);
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}
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/**
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* load32be:
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* @addr : pointer to unsigned 32-bit buffer
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*
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* Load value from address. Endian-safe.
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*
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* Returns: value from address, byte-swapped if necessary.
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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 swap_if_little32(*addr);
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}
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#endif
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