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42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include <my_global.h>
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#include "my_sys.h"
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/*
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Calculate a long checksum for a memoryblock.
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SYNOPSIS
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my_checksum()
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crc start value for crc
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pos pointer to memory block
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length length of the block
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*/
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ha_checksum my_checksum(ha_checksum crc, const byte *pos, uint length)
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{
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#ifdef NOT_USED
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const byte *end=pos+length;
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for ( ; pos != end ; pos++)
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crc=((crc << 8) + *((uchar*) pos)) + (crc >> (8*sizeof(ha_checksum)-8));
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return crc;
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#else
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return (ha_checksum)crc32((uint)crc, (const uchar *)pos, length);
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#endif
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}
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