#include "mess.h"
#include "image.h"
#include "cheatms.h"

static UINT32				* deviceCRCList = NULL;
static INT32				deviceCRCListLength = 0;
UINT32				thisGameCRC = 0;



static void BuildCRCTable(void)
{
	int	deviceType, deviceID, listIdx;

	free(deviceCRCList);

	// allocate list with single member (0x00000000)
	deviceCRCList = calloc(1, sizeof(UINT32));
	deviceCRCListLength = 1;

	for(deviceType = 0; deviceType < IO_COUNT; deviceType++)
	{
		for(deviceID = 0; deviceID < device_count(deviceType); deviceID++)
		{
			mess_image *img = image_from_devtype_and_index(deviceType, deviceID);
			if (image_exists(img))
			{
				UINT32	crc = image_crc(img);
				int		isUnique = 1;

				for(listIdx = 0; listIdx < deviceCRCListLength; listIdx++)
				{
					if(deviceCRCList[listIdx] == crc)
					{
						isUnique = 0;

						break;
					}
				}

				if(isUnique)
				{
					if(!thisGameCRC)
						thisGameCRC = crc;

					deviceCRCList = realloc(deviceCRCList, (deviceCRCListLength + 1) * sizeof(UINT32));

					deviceCRCList[deviceCRCListLength] = crc;
					deviceCRCListLength++;
				}
			}
		}
	}
}


void InitMessCheats(void)
{
	deviceCRCList =			NULL;
	deviceCRCListLength =	0;
	thisGameCRC =			0;

	BuildCRCTable();
}



void StopMessCheats(void)
{
	free(deviceCRCList);
	deviceCRCList = NULL;

	deviceCRCListLength = 0;
	thisGameCRC = 0;
}



int MatchesCRCTable(UINT32 crc)
{
	int	i;

	for(i = 0; i < deviceCRCListLength; i++)
		if(deviceCRCList[i] == crc)
			return 1;

	return 0;
}