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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;}