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