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/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include <my_global.h>
#include <my_sys.h>
#include <zlib.h>
ulong my_crc_dbug_check= ~0; /* Cannot happen */
/*
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)
{
crc= (ha_checksum) crc32((uint)crc, pos, (uint) length);
DBUG_PRINT("info", ("crc: %lu", (ulong) crc));
if ((ulong)crc == my_crc_dbug_check)
my_debug_put_break_here();
return crc;
}
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