Function ApplyIPS

src/file.cpp:65–147

void ApplyIPS(FILE *ips, FCEUFILE* fp)
{
	uint8 header[5];
	uint32 count=0;

	if(!ips) return;

	char* buf = (char*)FCEU_malloc(fp->size);
	memcpy(buf,fp->EnsureMemorystream()->buf(),fp->size);


	FCEU_printf(" Applying IPS...\n");
	if(fread(header,1,5,ips)!=5)
	{
		goto end;
	}
	if(memcmp(header,"PATCH",5))
	{
		goto end;
	}

	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);
			goto end;
		}

		size=fgetc(ips)<<8;
		size|=fgetc(ips);
		if(!size)	/* RLE */
		{
			char *start;
			char b;
			size=fgetc(ips)<<8;
			size|=fgetc(ips);

			//FCEU_printf("  Offset: %8d  Size: %5d RLE\n",offset,size);

			if((offset+size)>(uint32)fp->size)
			{
				// Probably a little slow.
				char *newbuf=(char *)FCEU_realloc(buf,offset+size);
				buf=newbuf;
				memset(buf+fp->size,0,offset+size-fp->size);
				fp->size=offset+size;
			}
			b=fgetc(ips);
			start=buf+offset;
			do
			{
				*start=b;
				start++;
			} while(--size);