104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
/* FCE Ultra - NES/Famicom Emulator
|
|
*
|
|
* Copyright notice for this file:
|
|
* Copyright (C) 2002 Xodnizel
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
/* Contains file I/O functions that write/read data */
|
|
/* LSB first. */
|
|
|
|
|
|
#include <stdio.h>
|
|
#include "types.h"
|
|
#include "endian.h"
|
|
|
|
void FlipByteOrder(uint8 *src, uint32 count)
|
|
{
|
|
uint8 *start=src;
|
|
uint8 *end=src+count-1;
|
|
|
|
if((count&1) || !count) return; /* This shouldn't happen. */
|
|
|
|
while(count--)
|
|
{
|
|
uint8 tmp;
|
|
|
|
tmp=*end;
|
|
*end=*start;
|
|
*start=tmp;
|
|
end--;
|
|
start++;
|
|
}
|
|
}
|
|
|
|
int write16le(uint16 b, FILE *fp)
|
|
{
|
|
uint8 s[2];
|
|
s[0]=b;
|
|
s[1]=b>>8;
|
|
return((fwrite(s,1,2,fp)<2)?0:2);
|
|
}
|
|
|
|
int write32le(uint32 b, FILE *fp)
|
|
{
|
|
uint8 s[4];
|
|
s[0]=b;
|
|
s[1]=b>>8;
|
|
s[2]=b>>16;
|
|
s[3]=b>>24;
|
|
return((fwrite(s,1,4,fp)<4)?0:4);
|
|
}
|
|
|
|
int read32le(uint32 *Bufo, FILE *fp)
|
|
{
|
|
uint32 buf;
|
|
if(fread(&buf,1,4,fp)<4)
|
|
return 0;
|
|
#ifdef LSB_FIRST
|
|
*(uint32*)Bufo=buf;
|
|
#else
|
|
*(uint32*)Bufo=((buf&0xFF)<<24)|((buf&0xFF00)<<8)|((buf&0xFF0000)>>8)|((buf&0xFF000000)>>24);
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
int read16le(char *d, FILE *fp)
|
|
{
|
|
#ifdef LSB_FIRST
|
|
return((fread(d,1,2,fp)<2)?0:2);
|
|
#else
|
|
int ret;
|
|
ret=fread(d+1,1,1,fp);
|
|
ret+=fread(d,1,1,fp);
|
|
return ret<2?0:2;
|
|
#endif
|
|
}
|
|
|
|
void FCEU_en32lsb(uint8 *buf, uint32 morp)
|
|
{
|
|
buf[0]=morp;
|
|
buf[1]=morp>>8;
|
|
buf[2]=morp>>16;
|
|
buf[3]=morp>>24;
|
|
}
|
|
|
|
uint32 FCEU_de32lsb(uint8 *morp)
|
|
{
|
|
return(morp[0]|(morp[1]<<8)|(morp[2]<<16)|(morp[3]<<24));
|
|
}
|
|
|