76 lines
1.2 KiB
C
76 lines
1.2 KiB
C
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/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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cddb.c
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Abstract:
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cddb support
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Environment:
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User mode only
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Revision History:
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05-26-98 : Created
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--*/
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#include "common.h"
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ULONG
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CDDB_ID(
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PCDROM_TOC toc
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)
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{
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ULONG i,n,j;
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ULONG cddbSum;
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ULONG totalLength;
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ULONG totalTracks;
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ULONG finalDiscId;
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i = 0;
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n = 0;
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totalTracks = toc->LastTrack - toc->FirstTrack;
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totalTracks++; // MCI difference
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while (i < totalTracks) {
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// cddb_sum
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cddbSum = 0;
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j = (toc->TrackData[i].Address[1] * 60) +
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(toc->TrackData[i].Address[2]);
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while (j > 0) {
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cddbSum += j % 10;
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j /= 10;
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}
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n += cddbSum;
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i++;
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}
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// compute total cd length in seconds
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totalLength =
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((toc->TrackData[totalTracks].Address[1] * 60) +
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(toc->TrackData[totalTracks].Address[2])
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) -
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((toc->TrackData[0].Address[1] * 60) +
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(toc->TrackData[0].Address[2])
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);
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finalDiscId = (((n % 0xff) << 24) |
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(totalLength << 8) |
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(totalTracks)
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);
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return finalDiscId;
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}
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