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ReactOS Development > Doxygen

USHORT FORCEINLINE ChkSum ( ULONG  Sum,
PUSHORT  Src,
ULONG  Len 
)

Definition at line 25 of file image.c.

Referenced by FF_CreateChkSum().

{
    ULONG i;

    for (i=0; i<Len; i++)
    {
        /* Sum up the current word */
        Sum += Src[i];

        /* Sum up everything above the low word as a carry */
        Sum = (Sum & 0xFFFF) + (Sum >> 16);
    }

    /* Apply carry one more time and clamp to the USHORT */
    return (Sum + (Sum >> 16)) & 0xFFFF;
}

Generated on Sat May 26 2012 04:56:52 for ReactOS by doxygen 1.7.6.1

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