/* 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

/*  Contains file I/O functions that write/read data    */
/*  LSB first.              */

#include <stdio.h>
#include "fceu-memory.h"
#include "fceu-types.h"
#include "fceu-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 MSB_FIRST
   *(uint32*)Bufo = ((buf & 0xFF) << 24) | ((buf & 0xFF00) << 8) | ((buf & 0xFF0000) >> 8) | ((buf & 0xFF000000) >> 24);
#else
   *(uint32*)Bufo = buf;
#endif
   return 1;
}

int write32le_mem(uint32 b, memstream_t *mem)
{
   uint8 s[4];
   s[0]=b;
   s[1]=b>>8;
   s[2]=b>>16;
   s[3]=b>>24;
   return((memstream_write(mem, s, 4)<4)?0:4);
}

int read32le_mem(uint32 *Bufo, memstream_t *mem)
{
   uint32 buf;
   if(memstream_read(mem, &buf, 4)<4)
      return 0;
#ifdef MSB_FIRST
   *(uint32*)Bufo=((buf&0xFF)<<24)|((buf&0xFF00)<<8)|((buf&0xFF0000)>>8)|((buf&0xFF000000)>>24);
#else
   *(uint32*)Bufo=buf;
#endif
   return 1;
}

int read16le(char *d, FILE *fp)
{
#ifdef MSB_FIRST
   int ret;
   ret = fread(d + 1, 1, 1, fp);
   ret += fread(d, 1, 1, fp);
   return ret < 2 ? 0 : 2;
#else
   return((fread(d, 1, 2, fp) < 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));
}
