mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 13:32:33 +01:00
7887babe69
- Reserver namespace and place in frm for TABLE_CHECKSUM and PAGE_CHECKSUM create options - Added syncing of directory when creating .frm files - Portability fixes - Added missing cast that could cause bugs - Code cleanups - Made some bit functions inline - Moved things out of myisam.h to my_handler.h to make them more accessable - Renamed some myisam variables and defines to make them more globaly usable (as they are used outside of MyISAM) - Fixed bugs in error conditions - Use compiler time asserts instead of run time - Fixed indentation HA_EXTRA_PREPARE_FOR_DELETE -> HA_EXTRA_PREPARE_FOR_DROP as the old name was wrong (Added a define for old value to ensure we don't break any old code) Added HA_EXTRA_PREPARE_FOR_RENAME as a signal for rename (before we used a DROP signal which is wrong) - Initialize error messages early to get better errors when mysqld or an engine fails to start - Fix windows bug that query_performance_frequency was not initialized if registry code failed - thread_stack -> my_thread_stack_size
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/* Copyright (C) 2000-2001, 2003-2004 MySQL 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 "myisamdef.h"
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ha_checksum mi_checksum(MI_INFO *info, const uchar *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 uchar *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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portable_sizeof_char_ptr,
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buf);
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memcpy((char*) &pos, buf+rec->length- 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 : (uchar*) "", 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 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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