mirror of
https://github.com/MariaDB/server.git
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3fb088a075
Add support for VARCHAR with 1 or 2 length bytes Enable VARCHAR packing in MyISAM files (previous patch didn't pack data properly) Give error if we got problems in temporary tables during a SELECT Don't use new table generated by ALTER TABLE if index generation fails Fixed wrong call by range_end() (Could cause an ASSERT in debug mode)
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* Copyright (C) 2000 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; either version 2 of the License, or
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(at your option) any later version.
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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 "myisamdef.h"
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ha_checksum mi_checksum(MI_INFO *info, const byte *buf)
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{
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uint i;
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ha_checksum crc=0;
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MI_COLUMNDEF *rec=info->s->rec;
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for (i=info->s->base.fields ; i-- ; buf+=(rec++)->length)
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{
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const byte *pos;
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ulong length;
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switch (rec->type) {
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case FIELD_BLOB:
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{
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length=_mi_calc_blob_length(rec->length-
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mi_portable_sizeof_char_ptr,
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buf);
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memcpy((char*) &pos, buf+rec->length- mi_portable_sizeof_char_ptr,
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sizeof(char*));
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break;
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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(rec->length-1);
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if (pack_length == 1)
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length= (ulong) *(uchar*) buf;
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else
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length= uint2korr(buf);
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pos= buf+pack_length;
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break;
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}
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default:
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length=rec->length;
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pos=buf;
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break;
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}
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crc=my_checksum(crc, pos ? pos : "", length);
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}
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return crc;
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}
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ha_checksum mi_static_checksum(MI_INFO *info, const byte *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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