152 lines
2.8 KiB
C++
152 lines
2.8 KiB
C++
/* Mednafen - Multi-system Emulator
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include "octoshock.h"
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#include "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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static void FlipByteOrder(uint8 *src, uint32 count)
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{
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uint8 *start=src;
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uint8 *end=src+count-1;
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if((count&1) || !count) return; /* This shouldn't happen. */
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count >>= 1;
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while(count--)
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{
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uint8 tmp;
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tmp=*end;
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*end=*start;
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*start=tmp;
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end--;
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start++;
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}
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}
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void Endian_V_NE_LE(void *src, uint32 bytesize)
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{
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#ifdef MSB_FIRST
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FlipByteOrder((uint8 *)src, bytesize);
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#endif
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}
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void Endian_V_NE_BE(void *src, uint32 bytesize)
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{
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#ifdef LSB_FIRST
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FlipByteOrder((uint8 *)src, bytesize);
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#endif
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}
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