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https://github.com/dborth/fceugx.git
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104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2002 Xodnizel
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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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/* Contains file I/O functions that write/read data */
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/* LSB first. */
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#include <stdio.h>
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#include "types.h"
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#include "endian.h"
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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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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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int write16le(uint16 b, FILE *fp)
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{
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uint8 s[2];
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s[0]=b;
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s[1]=b>>8;
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return((fwrite(s,1,2,fp)<2)?0:2);
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}
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int write32le(uint32 b, FILE *fp)
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{
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uint8 s[4];
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s[0]=b;
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s[1]=b>>8;
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s[2]=b>>16;
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s[3]=b>>24;
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return((fwrite(s,1,4,fp)<4)?0:4);
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}
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int read32le(uint32 *Bufo, FILE *fp)
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{
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uint32 buf;
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if(fread(&buf,1,4,fp)<4)
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return 0;
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#ifdef LSB_FIRST
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*(uint32*)Bufo=buf;
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#else
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*(uint32*)Bufo=((buf&0xFF)<<24)|((buf&0xFF00)<<8)|((buf&0xFF0000)>>8)|((buf&0xFF000000)>>24);
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#endif
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return 1;
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}
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int read16le(char *d, FILE *fp)
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{
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#ifdef LSB_FIRST
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return((fread(d,1,2,fp)<2)?0:2);
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#else
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int ret;
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ret=fread(d+1,1,1,fp);
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ret+=fread(d,1,1,fp);
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return ret<2?0:2;
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#endif
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}
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void FCEU_en32lsb(uint8 *buf, uint32 morp)
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{
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buf[0]=morp;
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buf[1]=morp>>8;
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buf[2]=morp>>16;
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buf[3]=morp>>24;
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}
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uint32 FCEU_de32lsb(uint8 *morp)
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{
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return(morp[0]|(morp[1]<<8)|(morp[2]<<16)|(morp[3]<<24));
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}
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