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/* Copyright (C) 2000 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <my_global.h>
#include <my_sys.h>
#include <zlib.h>
ha_checksum my_crc_dbug_check= 1; /* Unlikely number */
/*
Calculate a long checksum for a memoryblock.
SYNOPSIS
my_checksum()
crc start value for crc
pos pointer to memory block
length length of the block
*/
ha_checksum my_checksum(ha_checksum crc, const uchar *pos, size_t length)
{
#ifdef NOT_USED
const uchar *end=pos+length;
for ( ; pos != end ; pos++)
crc=((crc << 8) + *((uchar*) pos)) + (crc >> (8*sizeof(ha_checksum)-8));
#else
crc= (ha_checksum) crc32((uint)crc, pos, length);
#endif /* NOT_USED */
DBUG_PRINT("info", ("crc: %lu", (ulong) crc));
#ifndef DBUG_OFF
if (crc == my_crc_dbug_check)
my_debug_put_break_here();
#endif
return crc;
}
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