mirror of
https://github.com/MariaDB/server.git
synced 2025-01-18 04:53:01 +01:00
79922d946a
my_checksum() mysys function NISAM checksum code moved from mysys to isam/ - it's obsolete MyISAM checksum code moved to mysys table's checksum accessible from sql layer SHOW TABLE STATUS shows checksum (WL#646) code cleanup
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
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 */
|
|
|
|
/* Calculate a checksum for a row */
|
|
|
|
#include "myisamdef.h"
|
|
|
|
ha_checksum mi_checksum(MI_INFO *info, const byte *buf)
|
|
{
|
|
uint i;
|
|
ha_checksum crc=0;
|
|
MI_COLUMNDEF *rec=info->s->rec;
|
|
|
|
for (i=info->s->base.fields ; i-- ; buf+=(rec++)->length)
|
|
{
|
|
const byte *pos;
|
|
const byte *end;
|
|
ulong length;
|
|
switch (rec->type) {
|
|
case FIELD_BLOB:
|
|
{
|
|
length=_mi_calc_blob_length(rec->length-
|
|
mi_portable_sizeof_char_ptr,
|
|
buf);
|
|
memcpy((char*) &pos, buf+rec->length- mi_portable_sizeof_char_ptr,
|
|
sizeof(char*));
|
|
break;
|
|
}
|
|
case FIELD_VARCHAR:
|
|
{
|
|
length=uint2korr(buf);
|
|
pos=buf+2;
|
|
break;
|
|
}
|
|
default:
|
|
length=rec->length;
|
|
pos=buf;
|
|
break;
|
|
}
|
|
crc=my_checksum(crc, pos, length);
|
|
}
|
|
return crc;
|
|
}
|
|
|
|
|
|
ha_checksum mi_static_checksum(MI_INFO *info, const byte *pos)
|
|
{
|
|
return my_checksum(0, pos, info->s->base.reclength);
|
|
}
|