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fceux/file.cpp

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/* 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include <unistd.h> //mbg merge 7/17/06 - removed
#include <zlib.h>
#include "unzip.h"
#include "types.h"
#include "file.h"
#include "endian.h"
#include "memory.h"
#include "driver.h"
#include "general.h"
typedef struct {
uint8 *data;
uint32 size;
uint32 location;
} MEMWRAP;
void ApplyIPS(FILE *ips, MEMWRAP *dest)
{
uint8 header[5];
uint32 count=0;
FCEU_printf(" Applying IPS...\n");
if(fread(header,1,5,ips)!=5)
{
fclose(ips);
return;
}
if(memcmp(header,"PATCH",5))
{
fclose(ips);
return;
}
while(fread(header,1,3,ips)==3)
{
uint32 offset=(header[0]<<16)|(header[1]<<8)|header[2];
uint16 size;
if(!memcmp(header,"EOF",3))
{
FCEU_printf(" IPS EOF: Did %d patches\n\n",count);
fclose(ips);
return;
}
size=fgetc(ips)<<8;
size|=fgetc(ips);
if(!size) /* RLE */
{
uint8 *start;
uint8 b;
size=fgetc(ips)<<8;
size|=fgetc(ips);
//FCEU_printf(" Offset: %8d Size: %5d RLE\n",offset,size);
if((offset+size)>dest->size)
{
uint8 *tmp;
// Probably a little slow.
tmp=(uint8 *)realloc(dest->data,offset+size);
if(!tmp)
{
FCEU_printf(" Oops. IPS patch %d(type RLE) goes beyond end of file. Could not allocate memory.\n",count);
fclose(ips);
return;
}
dest->size=offset+size;
dest->data=tmp;
memset(dest->data+dest->size,0,offset+size-dest->size);
}
b=fgetc(ips);
start=dest->data+offset;
do
{
*start=b;
start++;
} while(--size);
}
else /* Normal patch */
{
//FCEU_printf(" Offset: %8d Size: %5d\n",offset,size);
if((offset+size)>dest->size)
{
uint8 *tmp;
// Probably a little slow.
tmp=(uint8 *)realloc(dest->data,offset+size);
if(!tmp)
{
FCEU_printf(" Oops. IPS patch %d(type normal) goes beyond end of file. Could not allocate memory.\n",count);
fclose(ips);
return;
}
dest->data=tmp;
memset(dest->data+dest->size,0,offset+size-dest->size);
}
fread(dest->data+offset,1,size,ips);
}
count++;
}
fclose(ips);
FCEU_printf(" Hard IPS end!\n");
}
static MEMWRAP *MakeMemWrap(void *tz, int type)
{
MEMWRAP *tmp;
if(!(tmp=(MEMWRAP *)FCEU_malloc(sizeof(MEMWRAP))))
goto doret;
tmp->location=0;
if(type==0)
{
fseek((FILE *)tz,0,SEEK_END);
tmp->size=ftell((FILE *)tz);
fseek((FILE *)tz,0,SEEK_SET);
if(!(tmp->data=(uint8*)FCEU_malloc(tmp->size)))
{
free(tmp);
tmp=0;
goto doret;
}
fread(tmp->data,1,tmp->size,(FILE *)tz);
}
else if(type==1)
{
/* Bleck. The gzip file format has the size of the uncompressed data,
but I can't get to the info with the zlib interface(?). */
for(tmp->size=0; gzgetc(tz) != EOF; tmp->size++);
gzseek(tz,0,SEEK_SET);
if(!(tmp->data=(uint8 *)FCEU_malloc(tmp->size)))
{
free(tmp);
tmp=0;
goto doret;
}
gzread(tz,tmp->data,tmp->size);
}
else if(type==2)
{
unz_file_info ufo;
unzGetCurrentFileInfo(tz,&ufo,0,0,0,0,0,0);
tmp->size=ufo.uncompressed_size;
if(!(tmp->data=(uint8 *)FCEU_malloc(ufo.uncompressed_size)))
{
free(tmp);
tmp=0;
goto doret;
}
unzReadCurrentFile(tz,tmp->data,ufo.uncompressed_size);
}
doret:
if(type==0)
{
fclose((FILE *)tz);
}
else if(type==1)
{
gzclose(tz);
}
else if(type==2)
{
unzCloseCurrentFile(tz);
unzClose(tz);
}
return tmp;
}
#ifndef __GNUC__
#define strcasecmp strcmp
#endif
FCEUFILE * FCEU_fopen(const char *path, const char *ipsfn, char *mode, char *ext)
{
FILE *ipsfile=0;
FCEUFILE *fceufp;
void *t;
if(strchr(mode,'r'))
ipsfile=FCEUD_UTF8fopen(ipsfn,"rb");
fceufp=(FCEUFILE *)malloc(sizeof(FCEUFILE));
{
unzFile tz;
if((tz=unzOpen(path))) // If it's not a zip file, use regular file handlers.
// Assuming file type by extension usually works,
// but I don't like it. :)
{
if(unzGoToFirstFile(tz)==UNZ_OK)
{
for(;;)
{
char tempu[512]; // Longer filenames might be possible, but I don't
// think people would name files that long in zip files...
unzGetCurrentFileInfo(tz,0,tempu,512,0,0,0,0);
tempu[511]=0;
if(strlen(tempu)>=4)
{
char *za=tempu+strlen(tempu)-4;
if(!ext)
{
if(!strcasecmp(za,".nes") || !strcasecmp(za,".fds") ||
!strcasecmp(za,".nsf") || !strcasecmp(za,".unf") ||
!strcasecmp(za,".nez"))
break;
}
else if(!strcasecmp(za,ext))
break;
}
if(strlen(tempu)>=5)
{
if(!strcasecmp(tempu+strlen(tempu)-5,".unif"))
break;
}
if(unzGoToNextFile(tz)!=UNZ_OK)
{
if(unzGoToFirstFile(tz)!=UNZ_OK) goto zpfail;
break;
}
}
if(unzOpenCurrentFile(tz)!=UNZ_OK)
goto zpfail;
}
else
{
zpfail:
free(fceufp);
unzClose(tz);
return 0;
}
if(!(fceufp->fp=MakeMemWrap(tz,2)))
{
free(fceufp);
return(0);
}
fceufp->type=2;
if(ipsfile)
ApplyIPS(ipsfile,(MEMWRAP *)fceufp->fp);
return(fceufp);
}
}
if((t=FCEUD_UTF8fopen(path,"rb")))
{
uint32 magic;
magic=fgetc((FILE *)t);
magic|=fgetc((FILE *)t)<<8;
magic|=fgetc((FILE *)t)<<16;
if(magic!=0x088b1f) /* Not gzip... */
fclose((FILE *)t);
else /* Probably gzip */
{
int fd;
fd = dup(fileno( (FILE *)t));
fclose((FILE*)t); //mbg merge 7/17/06 - cast to FILE*
lseek(fd, 0, SEEK_SET);
if((t=gzdopen(fd,mode)))
{
fceufp->type=1;
fceufp->fp=t;
if(ipsfile)
{
fceufp->fp=MakeMemWrap(t,1);
gzclose(t);
if(fceufp->fp)
{
free(fceufp);
return(0);
}
fceufp->type=3;
ApplyIPS(ipsfile,(MEMWRAP *)fceufp->fp);
}
return(fceufp);
}
close(fd);
}
}
if((t=FCEUD_UTF8fopen(path,mode)))
{
fseek((FILE *)t,0,SEEK_SET);
fceufp->type=0;
fceufp->fp=t;
if(ipsfile)
{
if(!(fceufp->fp=MakeMemWrap(t,0)))
{
free(fceufp);
return(0);
}
fceufp->type=3;
ApplyIPS(ipsfile,(MEMWRAP *)fceufp->fp);
}
return(fceufp);
}
free(fceufp);
return 0;
}
int FCEU_fclose(FCEUFILE *fp)
{
if(fp->type==1)
{
gzclose(fp->fp);
}
else if(fp->type>=2)
{
free(((MEMWRAP*)(fp->fp))->data);
free(fp->fp);
}
else
{
fclose((FILE *)fp->fp);
}
free(fp);
return 1;
}
uint64 FCEU_fread(void *ptr, size_t size, size_t nmemb, FCEUFILE *fp)
{
if(fp->type==1)
{
return gzread(fp->fp,ptr,size*nmemb);
}
else if(fp->type>=2)
{
MEMWRAP *wz;
uint32 total=size*nmemb;
wz=(MEMWRAP*)fp->fp;
if(wz->location>=wz->size) return 0;
if((wz->location+total)>wz->size)
{
int ak=wz->size-wz->location;
memcpy((uint8*)ptr,wz->data+wz->location,ak);
wz->location=wz->size;
return(ak/size);
}
else
{
memcpy((uint8*)ptr,wz->data+wz->location,total);
wz->location+=total;
return nmemb;
}
}
else
{
return fread(ptr,size,nmemb,(FILE *)fp->fp);
}
}
uint64 FCEU_fwrite(void *ptr, size_t size, size_t nmemb, FCEUFILE *fp)
{
if(fp->type==1)
{
return gzwrite(fp->fp,ptr,size*nmemb);
}
else if(fp->type>=2)
{
return 0;
}
else
return fwrite(ptr,size,nmemb,(FILE *)fp->fp);
}
int FCEU_fseek(FCEUFILE *fp, long offset, int whence)
{
if(fp->type==1)
{
return( (gzseek(fp->fp,offset,whence)>0)?0:-1);
}
else if(fp->type>=2)
{
MEMWRAP *wz;
wz=(MEMWRAP*)fp->fp;
switch(whence)
{
case SEEK_SET:if(offset>=(long)wz->size) //mbg merge 7/17/06 - added cast to long
return(-1);
wz->location=offset;break;
case SEEK_CUR:if(offset+wz->location>wz->size)
return (-1);
wz->location+=offset;
break;
}
return 0;
}
else
return fseek((FILE *)fp->fp,offset,whence);
}
uint64 FCEU_ftell(FCEUFILE *fp)
{
if(fp->type==1)
{
return gztell(fp->fp);
}
else if(fp->type>=2)
{
return (((MEMWRAP *)(fp->fp))->location);
}
else
return ftell((FILE *)fp->fp);
}
void FCEU_rewind(FCEUFILE *fp)
{
if(fp->type==1)
{
gzrewind(fp->fp);
}
else if(fp->type>=2)
{
((MEMWRAP *)(fp->fp))->location=0;
}
else
/* Rewind */
fseek((FILE*)fp->fp,0,SEEK_SET); //mbg merge 7/17/06 - added cast to FILE*
}
int FCEU_read16le(uint16 *val, FCEUFILE *fp)
{
uint8 t[4]; //mbg merge 7/17/06 - changed size from 2 to 4 to avoid dangerous problem with uint32* poking
if(fp->type>=1)
{
if(fp->type>=2)
{
MEMWRAP *wz;
wz=(MEMWRAP *)fp->fp;
if(wz->location+2>wz->size)
{return 0;}
*(uint32 *)t=*(uint32 *)(wz->data+wz->location);
wz->location+=2;
}
else if(fp->type==1)
if(gzread(fp->fp,&t,2)!=2) return(0);
return(1);
}
else
{
if(fread(t,1,2,(FILE *)fp->fp)!=2) return(0);
}
*val=t[0]|(t[1]<<8);
return(1);
}
int FCEU_read32le(uint32 *Bufo, FCEUFILE *fp)
{
if(fp->type>=1)
{
uint8 t[4];
#ifndef LSB_FIRST
uint8 x[4];
#endif
if(fp->type>=2)
{
MEMWRAP *wz;
wz=(MEMWRAP *)fp->fp;
if(wz->location+4>wz->size)
{return 0;}
*(uint32 *)t=*(uint32 *)(wz->data+wz->location);
wz->location+=4;
}
else if(fp->type==1)
gzread(fp->fp,&t,4);
#ifndef LSB_FIRST
x[0]=t[3];
x[1]=t[2];
x[2]=t[1];
x[3]=t[0];
*(uint32*)Bufo=*(uint32*)x;
#else
*(uint32*)Bufo=*(uint32*)t;
#endif
return 1;
}
else
{
return read32le(Bufo,(FILE *)fp->fp);
}
}
int FCEU_fgetc(FCEUFILE *fp)
{
if(fp->type==1)
return gzgetc(fp->fp);
else if(fp->type>=2)
{
MEMWRAP *wz;
wz=(MEMWRAP *)fp->fp;
if(wz->location<wz->size)
return wz->data[wz->location++];
return EOF;
}
else
return fgetc((FILE *)fp->fp);
}
uint64 FCEU_fgetsize(FCEUFILE *fp)
{
if(fp->type==1)
{
int x,t;
t=gztell(fp->fp);
gzrewind(fp->fp);
for(x=0; gzgetc(fp->fp) != EOF; x++);
gzseek(fp->fp,t,SEEK_SET);
return(x);
}
else if(fp->type>=2)
return ((MEMWRAP*)(fp->fp))->size;
else
{
long t,r;
t=ftell((FILE *)fp->fp);
fseek((FILE *)fp->fp,0,SEEK_END);
r=ftell((FILE *)fp->fp);
fseek((FILE *)fp->fp,t,SEEK_SET);
return r;
}
}
int FCEU_fisarchive(FCEUFILE *fp)
{
if(fp->type==2)
return 1;
return 0;
}
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