long GBAMethods::FindFreeSpace(long bNo, u8 bConst){//bNo is how many bytes, bConst is what
	//value to look for 
	
	// returns offset of "free space" block
	//	 or -1 if no such block found
	
	FILE* file = fopen(GBA.FileLoc,"rb");
	if(!file)
		return -1;
	
	
	bNo+=0x100;//Look for an extra free 256 bytes. -- still not sure what this does,
                   // but whatever
	int ch;
	long runstart = -1;
	long runcount = 0;
	while(1)
	{
		ch = fgetc(file);		// get character (byte)
		if(ch == EOF)		// if end of file
		{
		  	runstart = -1;	// eof reached before we found block
			break;
		  
		}
		
		if((u8)ch == bConst)
		{
			if(!runcount)	// start of run
				runstart = (long)ftell(file) - 1;
			
			++runcount;
			if(runcount >= bNo) 	// block found
				break;
		}
		else
		{
			runstart = -1;
			runcount = 0;
		}
	
	}
	
	fclose(file);
	
	return runstart;
}