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fceux/netplay.c

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C
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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 <sys/types.h>
#include <sys/stat.h>
//#include <unistd.h> //mbg merge 7/17/06 removed
#include <zlib.h>
#include "types.h"
#include "netplay.h"
#include "fceu.h"
#include "general.h"
#include "state.h"
#include "cheat.h"
#include "input.h"
#include "endian.h"
int FCEUnetplay=0;
static uint8 netjoy[4]; /* Controller cache. */
static int numlocal;
static int netdivisor;
static int netdcount;
/* NetError should only be called after a FCEUD_*Data function returned 0, in the function
that called FCEUD_*Data, to prevent it from being called twice.
*/
static void NetError(void)
{
FCEU_DispMessage("Network error/connection lost!");
FCEUD_NetworkClose();
}
void FCEUI_NetplayStop(void)
{
if(FCEUnetplay)
{
FCEUnetplay = 0;
FCEU_FlushGameCheats(0,1); /* Don't save netplay cheats. */
FCEU_LoadGameCheats(0); /* Reload our original cheats. */
}
else puts("Check your code!");
}
int FCEUI_NetplayStart(int nlocal, int divisor)
{
FCEU_FlushGameCheats(0, 0); /* Save our pre-netplay cheats. */
FCEU_LoadGameCheats(0); /* Load them again, for pre-multiplayer
action.
*/
FCEUnetplay = 1;
memset(netjoy,0,sizeof(netjoy));
numlocal = nlocal;
netdivisor = divisor;
netdcount = 0;
return(1);
}
int FCEUNET_SendCommand(uint8 cmd, uint32 len)
{
//mbg merge 7/17/06 changed to alloca
//uint8 buf[numlocal + 1 + 4];
uint8 *buf = (uint8*)_alloca(numlocal+1+4);
buf[0] = 0xFF;
FCEU_en32lsb(&buf[numlocal], len);
buf[numlocal + 4] = cmd;
#ifdef NETWORK
if(!FCEUD_SendData(buf,numlocal + 1 + 4))
{
NetError();
return(0);
}
#endif
return(1);
}
void FCEUI_NetplayText(uint8 *text)
{
uint32 len;
len = strlen((char*)text); //mbg merge 7/17/06 added cast
if(!FCEUNET_SendCommand(FCEUNPCMD_TEXT,len)) return;
if(!FCEUD_SendData(text,len))
NetError();
}
int FCEUNET_SendFile(uint8 cmd, char *fn)
{
uint32 len;
uLongf clen;
char *buf, *cbuf;
FILE *fp;
struct stat sb;
if(!(fp=FCEUD_UTF8fopen(fn,"rb"))) return(0);
fstat(fileno(fp),&sb);
len = sb.st_size;
buf = (char*)malloc(len); //mbg merge 7/17/06 added cast
fread(buf, 1, len, fp);
fclose(fp);
cbuf = (char*)malloc(4 + len + len / 1000 + 12); //mbg merge 7/17/06 added cast
FCEU_en32lsb((uint8*)cbuf, len); //mbg merge 7/17/06 added cast
compress2((uint8*)cbuf + 4, &clen, (uint8*)buf, len, 7); //mbg merge 7/17/06 added casts
free(buf);
//printf("Sending file: %s, %d, %d\n",fn,len,clen);
len = clen + 4;
#ifdef NETWORK
if(!FCEUNET_SendCommand(cmd,len))
{
free(cbuf);
return(0);
}
if(!FCEUD_SendData(cbuf, len))
{
NetError();
free(cbuf);
return(0);
}
#endif
free(cbuf);
return(1);
}
static FILE *FetchFile(uint32 remlen)
{
uint32 clen = remlen;
char *cbuf;
uLongf len;
char *buf;
FILE *fp;
char *fn;
if(clen > 500000) // Sanity check
{
NetError();
return(0);
}
//printf("Receiving file: %d...\n",clen);
fn = FCEU_MakeFName(FCEUMKF_NPTEMP,0,0);
if((fp = fopen(fn,"w+b")))
{
cbuf = (char *)malloc(clen); //mbg merge 7/17/06 added cast
if(!FCEUD_RecvData(cbuf, clen))
{
NetError();
unlink(fn);
fclose(fp);
free(cbuf);
free(fn);
return(0);
}
len = FCEU_de32lsb((uint8*)cbuf); //mbg merge 7/17/06 added cast
if(len > 500000) // Another sanity check
{
NetError();
unlink(fn);
fclose(fp);
free(cbuf);
free(fn);
return(0);
}
buf = (char *)malloc(len); //mbg merge 7/17/06 added cast
uncompress((uint8*)buf, &len, (uint8*)cbuf + 4, clen - 4); //mbg merge 7/17/06 added casts
fwrite(buf, 1, len, fp);
free(buf);
fseek(fp, 0, SEEK_SET);
unlink(fn);
free(fn);
return(fp);
}
free(fn);
return(0);
}
void NetplayUpdate(uint8 *joyp)
{
static uint8 buf[5]; /* 4 play states, + command/extra byte */
static uint8 joypb[4];
memcpy(joypb,joyp,4);
/* This shouldn't happen, but just in case. 0xFF is used as a command escape elsewhere. */
if(joypb[0] == 0xFF)
joypb[0] = 0xF;
#ifdef NETWORK
if(!netdcount)
if(!FCEUD_SendData(joypb,numlocal))
{
NetError();
return;
}
if(!netdcount)
do
{
if(!FCEUD_RecvData(buf,5))
{
NetError();
return;
}
switch(buf[4])
{
default: FCEU_DoSimpleCommand(buf[4]);break;
case FCEUNPCMD_TEXT:
{
uint8 *tbuf;
uint32 len = FCEU_de32lsb(buf);
if(len > 100000) // Insanity check!
{
NetError();
return;
}
tbuf = (uint8*)malloc(len + 1); //mbg merge 7/17/06 added cast
tbuf[len] = 0;
if(!FCEUD_RecvData(tbuf, len))
{
NetError();
free(tbuf);
return;
}
FCEUD_NetplayText(tbuf);
free(tbuf);
}
break;
case FCEUNPCMD_SAVESTATE:
{
char *fn;
FILE *fp;
/* Send the cheats first, then the save state, since
there might be a frame or two in between the two sendfile
commands on the server side.
*/
fn = FCEU_MakeFName(FCEUMKF_CHEAT,0,0);
//if(!
FCEUNET_SendFile(FCEUNPCMD_LOADCHEATS,fn);
// {
// free(fn);
// return;
// }
free(fn);
if(!FCEUnetplay) return;
fn = FCEU_MakeFName(FCEUMKF_NPTEMP,0,0);
fp = fopen(fn, "wb");
if(FCEUSS_SaveFP(fp))
{
fclose(fp);
if(!FCEUNET_SendFile(FCEUNPCMD_LOADSTATE, fn))
{
unlink(fn);
free(fn);
return;
}
unlink(fn);
free(fn);
}
else
{
fclose(fp);
FCEUD_PrintError("File error. (K)ill, (M)aim, (D)estroy? Now!");
unlink(fn);
free(fn);
return;
}
}
break;
case FCEUNPCMD_LOADCHEATS:
{
FILE *fp = FetchFile(FCEU_de32lsb(buf));
if(!fp) return;
FCEU_FlushGameCheats(0,1);
FCEU_LoadGameCheats(fp);
}
break;
case FCEUNPCMD_LOADSTATE:
{
FILE *fp = FetchFile(FCEU_de32lsb(buf));
if(!fp) return;
if(FCEUSS_LoadFP(fp,1))
{
fclose(fp);
FCEU_DispMessage("Remote state loaded.");
} else FCEUD_PrintError("File error. (K)ill, (M)aim, (D)estroy?");
}
break;
}
} while(buf[4]);
#endif
netdcount=(netdcount+1)%netdivisor;
memcpy(netjoy,buf,4);
*(uint32 *)joyp=*(uint32 *)netjoy;
}
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