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https://github.com/libretro/beetle-psx-libretro.git
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134 lines
2.8 KiB
C++
134 lines
2.8 KiB
C++
/******************************************************************************/
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/* Mednafen - Multi-system Emulator */
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/******************************************************************************/
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/* endian.cpp:
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** Copyright (C) 2006-2016 Mednafen Team
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** 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
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** along with this program; if not, write to the Free Software Foundation, Inc.,
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** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "mednafen.h"
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#include "mednafen-endian.h"
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void Endian_A16_Swap(void *src, uint32 nelements)
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{
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uint32 i;
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uint8 *nsrc = (uint8 *)src;
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for(i = 0; i < nelements; i++)
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{
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uint8 tmp = nsrc[i * 2];
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nsrc[i * 2] = nsrc[i * 2 + 1];
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nsrc[i * 2 + 1] = tmp;
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}
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}
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void Endian_A32_Swap(void *src, uint32 nelements)
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{
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uint32 i;
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uint8 *nsrc = (uint8 *)src;
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for(i = 0; i < nelements; i++)
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{
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uint8 tmp1 = nsrc[i * 4];
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uint8 tmp2 = nsrc[i * 4 + 1];
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nsrc[i * 4] = nsrc[i * 4 + 3];
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nsrc[i * 4 + 1] = nsrc[i * 4 + 2];
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nsrc[i * 4 + 2] = tmp2;
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nsrc[i * 4 + 3] = tmp1;
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}
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}
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void Endian_A64_Swap(void *src, uint32 nelements)
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{
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uint32 i;
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uint8 *nsrc = (uint8 *)src;
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for(i = 0; i < nelements; i++)
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{
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uint8 *base = &nsrc[i * 8];
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for(int z = 0; z < 4; z++)
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{
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uint8 tmp = base[z];
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base[z] = base[7 - z];
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base[7 - z] = tmp;
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}
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}
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}
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void Endian_A16_NE_LE(void *src, uint32 nelements)
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{
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#ifdef MSB_FIRST
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Endian_A16_Swap(src, nelements);
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#endif
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}
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void Endian_A32_NE_LE(void *src, uint32 nelements)
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{
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#ifdef MSB_FIRST
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Endian_A32_Swap(src, nelements);
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#endif
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}
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void Endian_A64_NE_LE(void *src, uint32 nelements)
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{
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#ifdef MSB_FIRST
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Endian_A64_Swap(src, nelements);
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#endif
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}
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//
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//
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//
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void Endian_A16_NE_BE(void *src, uint32 nelements)
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{
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#ifdef LSB_FIRST
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Endian_A16_Swap(src, nelements);
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#endif
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}
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void Endian_A32_NE_BE(void *src, uint32 nelements)
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{
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#ifdef LSB_FIRST
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Endian_A32_Swap(src, nelements);
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#endif
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}
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void Endian_A64_NE_BE(void *src, uint32 nelements)
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{
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#ifdef LSB_FIRST
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Endian_A64_Swap(src, nelements);
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#endif
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}
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void Endian_V_NE_LE(void* p, size_t len)
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{
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#ifdef MSB_FIRST
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std::reverse((uint8*)p, (uint8*)p + len);
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#endif
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}
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void Endian_V_NE_BE(void* p, size_t len)
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{
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#ifdef LSB_FIRST
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std::reverse((uint8*)p, (uint8*)p + len);
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#endif
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}
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