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579 lines
15 KiB
579 lines
15 KiB
/* Copyright (C) 2010-2020 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) && _MSC_VER > 1200
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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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static INLINE uint16_t SWAP16(uint16_t x)
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{
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return ((x & 0x00ff) << 8) |
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((x & 0xff00) >> 8);
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}
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static INLINE uint32_t SWAP32(uint32_t x)
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{
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return ((x & 0x000000ff) << 24) |
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((x & 0x0000ff00) << 8) |
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((x & 0x00ff0000) >> 8) |
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((x & 0xff000000) >> 24);
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}
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#endif
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#if defined(_MSC_VER) && _MSC_VER <= 1200
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static INLINE uint64_t SWAP64(uint64_t val)
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{
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return
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((val & 0x00000000000000ff) << 56)
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| ((val & 0x000000000000ff00) << 40)
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| ((val & 0x0000000000ff0000) << 24)
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| ((val & 0x00000000ff000000) << 8)
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| ((val & 0x000000ff00000000) >> 8)
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| ((val & 0x0000ff0000000000) >> 24)
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| ((val & 0x00ff000000000000) >> 40)
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| ((val & 0xff00000000000000) >> 56);
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}
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#else
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static INLINE uint64_t SWAP64(uint64_t val)
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{
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return ((val & 0x00000000000000ffULL) << 56)
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| ((val & 0x000000000000ff00ULL) << 40)
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| ((val & 0x0000000000ff0000ULL) << 24)
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| ((val & 0x00000000ff000000ULL) << 8)
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| ((val & 0x000000ff00000000ULL) >> 8)
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| ((val & 0x0000ff0000000000ULL) >> 24)
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| ((val & 0x00ff000000000000ULL) >> 40)
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| ((val & 0xff00000000000000ULL) >> 56);
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}
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#endif
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#if defined (LSB_FIRST) || defined (MSB_FIRST)
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# warning Defining MSB_FIRST and LSB_FIRST in compile options is deprecated
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# undef LSB_FIRST
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# undef MSB_FIRST
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#endif
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#ifdef _MSC_VER
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/* MSVC pre-defines macros depending on target arch */
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#if defined (_M_IX86) || defined (_M_AMD64) || defined (_M_ARM) || defined (_M_ARM64)
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#define LSB_FIRST 1
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#elif _M_PPC
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#define MSB_FIRST 1
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#else
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/* MSVC can run on _M_ALPHA and _M_IA64 too, but they're both bi-endian; need to find what mode MSVC runs them at */
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#error "unknown platform, can't determine endianness"
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#endif
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#else
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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#define MSB_FIRST 1
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#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define LSB_FIRST 1
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#else
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#error "Invalid endianness macros"
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#endif
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#endif
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#if defined(MSB_FIRST) && defined(LSB_FIRST)
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# error "Bug in LSB_FIRST/MSB_FIRST definition"
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#endif
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#if !defined(MSB_FIRST) && !defined(LSB_FIRST)
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# error "Bug in LSB_FIRST/MSB_FIRST definition"
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#endif
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#ifdef MSB_FIRST
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# define RETRO_IS_BIG_ENDIAN 1
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# define RETRO_IS_LITTLE_ENDIAN 0
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/* For compatibility */
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# define WORDS_BIGENDIAN 1
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#else
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# define RETRO_IS_BIG_ENDIAN 0
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# define RETRO_IS_LITTLE_ENDIAN 1
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/* For compatibility */
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# undef WORDS_BIGENDIAN
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#endif
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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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#define is_little_endian() RETRO_IS_LITTLE_ENDIAN
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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 RETRO_IS_BIG_ENDIAN
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#define swap_if_big64(val) (SWAP64(val))
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#elif RETRO_IS_LITTLE_ENDIAN
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#define swap_if_big64(val) (val)
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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 RETRO_IS_BIG_ENDIAN
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#define swap_if_big32(val) (SWAP32(val))
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#elif RETRO_IS_LITTLE_ENDIAN
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#define swap_if_big32(val) (val)
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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 RETRO_IS_BIG_ENDIAN
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#define swap_if_little64(val) (val)
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#elif RETRO_IS_LITTLE_ENDIAN
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#define swap_if_little64(val) (SWAP64(val))
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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 RETRO_IS_BIG_ENDIAN
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#define swap_if_little32(val) (val)
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#elif RETRO_IS_LITTLE_ENDIAN
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#define swap_if_little32(val) (SWAP32(val))
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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 RETRO_IS_BIG_ENDIAN
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#define swap_if_big16(val) (SWAP16(val))
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#elif RETRO_IS_LITTLE_ENDIAN
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#define swap_if_big16(val) (val)
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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 RETRO_IS_BIG_ENDIAN
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#define swap_if_little16(val) (val)
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#elif RETRO_IS_LITTLE_ENDIAN
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#define swap_if_little16(val) (SWAP16(val))
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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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/**
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* retro_cpu_to_le16:
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* @val : unsigned 16-bit value
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*
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* Convert unsigned 16-bit value from system to little-endian.
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*
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* Returns: Little-endian representation of val.
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**/
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#define retro_cpu_to_le16(val) swap_if_big16(val)
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/**
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* retro_cpu_to_le32:
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* @val : unsigned 32-bit value
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*
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* Convert unsigned 32-bit value from system to little-endian.
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*
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* Returns: Little-endian representation of val.
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**/
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#define retro_cpu_to_le32(val) swap_if_big32(val)
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/**
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* retro_cpu_to_le64:
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* @val : unsigned 64-bit value
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*
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* Convert unsigned 64-bit value from system to little-endian.
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*
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* Returns: Little-endian representation of val.
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**/
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#define retro_cpu_to_le64(val) swap_if_big64(val)
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/**
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* retro_le_to_cpu16:
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* @val : unsigned 16-bit value
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*
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* Convert unsigned 16-bit value from little-endian to native.
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*
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* Returns: Native representation of little-endian val.
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**/
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#define retro_le_to_cpu16(val) swap_if_big16(val)
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/**
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* retro_le_to_cpu32:
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* @val : unsigned 32-bit value
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*
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* Convert unsigned 32-bit value from little-endian to native.
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*
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* Returns: Native representation of little-endian val.
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**/
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#define retro_le_to_cpu32(val) swap_if_big32(val)
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/**
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* retro_le_to_cpu16:
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* @val : unsigned 64-bit value
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*
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* Convert unsigned 64-bit value from little-endian to native.
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*
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* Returns: Native representation of little-endian val.
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**/
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#define retro_le_to_cpu64(val) swap_if_big64(val)
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/**
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* retro_cpu_to_be16:
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* @val : unsigned 16-bit value
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*
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* Convert unsigned 16-bit value from system to big-endian.
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*
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* Returns: Big-endian representation of val.
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**/
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#define retro_cpu_to_be16(val) swap_if_little16(val)
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/**
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* retro_cpu_to_be32:
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* @val : unsigned 32-bit value
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*
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* Convert unsigned 32-bit value from system to big-endian.
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*
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* Returns: Big-endian representation of val.
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**/
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#define retro_cpu_to_be32(val) swap_if_little32(val)
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/**
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* retro_cpu_to_be64:
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* @val : unsigned 64-bit value
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*
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* Convert unsigned 64-bit value from system to big-endian.
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*
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* Returns: Big-endian representation of val.
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**/
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#define retro_cpu_to_be64(val) swap_if_little64(val)
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/**
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* retro_be_to_cpu16:
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* @val : unsigned 16-bit value
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*
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* Convert unsigned 16-bit value from big-endian to native.
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*
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* Returns: Native representation of big-endian val.
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**/
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#define retro_be_to_cpu16(val) swap_if_little16(val)
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/**
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* retro_be_to_cpu32:
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* @val : unsigned 32-bit value
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*
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* Convert unsigned 32-bit value from big-endian to native.
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*
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* Returns: Native representation of big-endian val.
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**/
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#define retro_be_to_cpu32(val) swap_if_little32(val)
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/**
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* retro_be_to_cpu64:
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* @val : unsigned 64-bit value
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*
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* Convert unsigned 64-bit value from big-endian to native.
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*
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* Returns: Native representation of big-endian val.
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**/
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#define retro_be_to_cpu64(val) swap_if_little64(val)
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#ifdef __GNUC__
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/* This attribute means that the same memory may be referred through
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pointers to different size of the object (aliasing). E.g. that u8 *
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and u32 * may actually be pointing to the same object. */
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#define MAY_ALIAS __attribute__((__may_alias__))
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#else
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#define MAY_ALIAS
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#endif
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#pragma pack(push, 1)
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struct retro_unaligned_uint16_s
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{
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uint16_t val;
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} MAY_ALIAS;
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struct retro_unaligned_uint32_s
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{
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uint32_t val;
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} MAY_ALIAS;
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struct retro_unaligned_uint64_s
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{
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uint64_t val;
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} MAY_ALIAS;
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#pragma pack(pop)
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typedef struct retro_unaligned_uint16_s retro_unaligned_uint16_t;
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typedef struct retro_unaligned_uint32_s retro_unaligned_uint32_t;
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typedef struct retro_unaligned_uint64_s retro_unaligned_uint64_t;
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/* L-value references to unaligned pointers. */
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#define retro_unaligned16(p) (((retro_unaligned_uint16_t *)p)->val)
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#define retro_unaligned32(p) (((retro_unaligned_uint32_t *)p)->val)
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#define retro_unaligned64(p) (((retro_unaligned_uint64_t *)p)->val)
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/**
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* retro_get_unaligned_16be:
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* @addr : pointer to unsigned 16-bit value
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*
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* Convert unsigned unaligned 16-bit value from big-endian to native.
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*
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* Returns: Native representation of big-endian val.
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**/
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static INLINE uint16_t retro_get_unaligned_16be(void *addr) {
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return retro_be_to_cpu16(retro_unaligned16(addr));
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}
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/**
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* retro_get_unaligned_32be:
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* @addr : pointer to unsigned 32-bit value
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*
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* Convert unsigned unaligned 32-bit value from big-endian to native.
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*
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* Returns: Native representation of big-endian val.
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**/
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static INLINE uint32_t retro_get_unaligned_32be(void *addr) {
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return retro_be_to_cpu32(retro_unaligned32(addr));
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}
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/**
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* retro_get_unaligned_64be:
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* @addr : pointer to unsigned 64-bit value
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*
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* Convert unsigned unaligned 64-bit value from big-endian to native.
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*
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* Returns: Native representation of big-endian val.
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**/
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static INLINE uint64_t retro_get_unaligned_64be(void *addr) {
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return retro_be_to_cpu64(retro_unaligned64(addr));
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}
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/**
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|
* retro_get_unaligned_16le:
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* @addr : pointer to unsigned 16-bit value
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|
*
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* Convert unsigned unaligned 16-bit value from little-endian to native.
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*
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* Returns: Native representation of little-endian val.
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**/
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static INLINE uint16_t retro_get_unaligned_16le(void *addr) {
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return retro_le_to_cpu16(retro_unaligned16(addr));
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}
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/**
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|
* retro_get_unaligned_32le:
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|
* @addr : pointer to unsigned 32-bit value
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|
*
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* Convert unsigned unaligned 32-bit value from little-endian to native.
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*
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* Returns: Native representation of little-endian val.
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|
**/
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static INLINE uint32_t retro_get_unaligned_32le(void *addr) {
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return retro_le_to_cpu32(retro_unaligned32(addr));
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}
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/**
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|
* retro_get_unaligned_64le:
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|
* @addr : pointer to unsigned 64-bit value
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*
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* Convert unsigned unaligned 64-bit value from little-endian to native.
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*
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* Returns: Native representation of little-endian val.
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**/
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static INLINE uint64_t retro_get_unaligned_64le(void *addr) {
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return retro_le_to_cpu64(retro_unaligned64(addr));
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}
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/**
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|
* retro_set_unaligned_16le:
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|
* @addr : pointer to unsigned 16-bit value
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* @val : value to store
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*
|
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* Convert native value to unsigned unaligned 16-bit little-endian value
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*
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|
**/
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static INLINE void retro_set_unaligned_16le(void *addr, uint16_t v) {
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retro_unaligned16(addr) = retro_cpu_to_le16(v);
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}
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/**
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|
* retro_set_unaligned_32le:
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|
* @addr : pointer to unsigned 32-bit value
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|
* @val : value to store
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|
*
|
|
* Convert native value to unsigned unaligned 32-bit little-endian value
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|
*
|
|
**/
|
|
|
|
static INLINE void retro_set_unaligned_32le(void *addr, uint32_t v) {
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retro_unaligned32(addr) = retro_cpu_to_le32(v);
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|
}
|
|
|
|
/**
|
|
* retro_set_unaligned_32le:
|
|
* @addr : pointer to unsigned 32-bit value
|
|
* @val : value to store
|
|
*
|
|
* Convert native value to unsigned unaligned 32-bit little-endian value
|
|
*
|
|
**/
|
|
|
|
static INLINE void retro_set_unaligned_64le(void *addr, uint64_t v) {
|
|
retro_unaligned64(addr) = retro_cpu_to_le64(v);
|
|
}
|
|
|
|
/**
|
|
* retro_set_unaligned_16be:
|
|
* @addr : pointer to unsigned 16-bit value
|
|
* @val : value to store
|
|
*
|
|
* Convert native value to unsigned unaligned 16-bit big-endian value
|
|
*
|
|
**/
|
|
|
|
static INLINE void retro_set_unaligned_16be(void *addr, uint16_t v) {
|
|
retro_unaligned16(addr) = retro_cpu_to_be16(v);
|
|
}
|
|
|
|
/**
|
|
* retro_set_unaligned_32be:
|
|
* @addr : pointer to unsigned 32-bit value
|
|
* @val : value to store
|
|
*
|
|
* Convert native value to unsigned unaligned 32-bit big-endian value
|
|
*
|
|
**/
|
|
|
|
static INLINE void retro_set_unaligned_32be(void *addr, uint32_t v) {
|
|
retro_unaligned32(addr) = retro_cpu_to_be32(v);
|
|
}
|
|
|
|
/**
|
|
* retro_set_unaligned_32be:
|
|
* @addr : pointer to unsigned 32-bit value
|
|
* @val : value to store
|
|
*
|
|
* Convert native value to unsigned unaligned 32-bit big-endian value
|
|
*
|
|
**/
|
|
|
|
static INLINE void retro_set_unaligned_64be(void *addr, uint64_t v) {
|
|
retro_unaligned64(addr) = retro_cpu_to_be64(v);
|
|
}
|
|
|
|
|
|
#endif
|
|
|