65 lines
801 B
C
65 lines
801 B
C
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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hivesum.c
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Abstract:
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Hive header checksum module.
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Author:
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Bryan M. Willman (bryanwi) 9-Apr-92
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Environment:
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Revision History:
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--*/
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#include "cmp.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,HvpHeaderCheckSum)
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#endif
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ULONG
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HvpHeaderCheckSum(
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PHBASE_BLOCK BaseBlock
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)
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/*++
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Routine Description:
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Compute the checksum for a hive disk header.
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Arguments:
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BaseBlock - supplies pointer to the header to checksum
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Return Value:
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the check sum.
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--*/
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{
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ULONG sum;
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ULONG i;
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sum = 0;
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for (i = 0; i < 127; i++) {
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sum ^= ((PULONG)BaseBlock)[i];
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}
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if (sum == (ULONG)-1) {
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sum = (ULONG)-2;
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}
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if (sum == 0) {
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sum = 1;
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}
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return sum;
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}
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