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30 lines
1.1 KiB
C
30 lines
1.1 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA */
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/* Calculate a long checksum for a memoryblock. Used to verify pack_isam */
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#include <global.h>
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#include "my_sys.h"
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ulong checksum(const byte *mem, uint count)
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{
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ulong crc;
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for (crc=0; count-- ; mem++)
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crc=((crc << 1) + *((uchar*) mem)) +
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test(crc & ((ulong) 1L << (8*sizeof(ulong)-1)));
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return crc;
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}
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