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631ecaabea
BUILD/compile-pentium-debug-max: Added definition after macro was removed from main tree. This will be fixed back in main tree later.
69 lines
2 KiB
C
69 lines
2 KiB
C
/* Copyright (C) 2006 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; version 2 of the License.
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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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/* Calculate a checksum for a row */
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#include "maria_def.h"
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ha_checksum _ma_checksum(MARIA_HA *info, const uchar *record)
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{
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ha_checksum crc=0;
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MARIA_COLUMNDEF *column= info->s->columndef;
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MARIA_COLUMNDEF *column_end= column+ info->s->base.fields;
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if (info->s->base.null_bytes)
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crc= my_checksum(crc, record, info->s->base.null_bytes);
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for ( ; column != column_end ; column++)
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{
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const uchar *pos= record + column->offset;
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ulong length;
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switch (column->type) {
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case FIELD_BLOB:
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{
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uint blob_size_length= column->length- portable_sizeof_char_ptr;
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length= _ma_calc_blob_length(blob_size_length, pos);
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if (length)
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{
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memcpy((char*) &pos, pos + blob_size_length, sizeof(char*));
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crc= my_checksum(crc, pos, length);
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}
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continue;
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}
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case FIELD_VARCHAR:
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{
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uint pack_length= HA_VARCHAR_PACKLENGTH(column->length-1);
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if (pack_length == 1)
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length= (ulong) *(uchar*) pos;
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else
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length= uint2korr(pos);
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pos+= pack_length;
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break;
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}
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default:
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length= column->length;
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break;
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}
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crc= my_checksum(crc, pos, length);
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}
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return crc;
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}
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ha_checksum _ma_static_checksum(MARIA_HA *info, const uchar *pos)
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{
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return my_checksum(0, pos, info->s->base.reclength);
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}
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