DWORD QuickChecksum(DWORD *pData, int size) {
	if(!pData) return 0;

	DWORD sum;
	DWORD tmp;
	sum = *pData;
	for(int i = 1; i < (size/4); i++) {
		tmp = pData[i];
		tmp = (DWORD)(sum >> 29) + tmp;
		tmp = (DWORD)(sum >> 17) + tmp;
		sum = (DWORD)(sum << 3)  ^ tmp;
	}
	return sum;
}