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56 lines
2.2 KiB
C
56 lines
2.2 KiB
C
/* Copyright (c) Monty Program Ab; 1991-2011
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; version 2
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of the License.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA */
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#ifndef _my_handler_h
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#define _my_handler_h
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/*
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There is a hard limit for the maximum number of keys as there are only
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8 bits in the index file header for the number of keys in a table.
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This means that 0..255 keys can exist for a table. The idea of
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HA_MAX_POSSIBLE_KEY is to ensure that one can use myisamchk & tools on
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a MyISAM table for which one has more keys than MyISAM is normally
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compiled for. If you don't have this, you will get a core dump when
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running myisamchk compiled for 128 keys on a table with 255 keys.
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*/
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#define HA_MAX_POSSIBLE_KEY 255 /* For myisamchk */
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/*
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The following defines can be increased if necessary.
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But beware the dependency of HA_MAX_POSSIBLE_KEY_BUFF and HA_MAX_KEY_LENGTH.
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*/
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#define HA_MAX_KEY_LENGTH 1000 /* Max length in bytes */
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#define HA_MAX_KEY_SEG 32 /* Max segments for key */
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#define HA_MAX_POSSIBLE_KEY_BUFF (HA_MAX_KEY_LENGTH + 24+ 6+6)
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#define HA_MAX_KEY_BUFF (HA_MAX_KEY_LENGTH+HA_MAX_KEY_SEG*6+8+8)
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#define HA_MAX_MSG_BUF 1024 /* used in CHECK TABLE, REPAIR TABLE */
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/*
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Inside an in-memory data record, memory pointers to pieces of the
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record (like BLOBs) are stored in their native byte order and in
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this amount of bytes.
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*/
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#define portable_sizeof_char_ptr 8
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/* Register / unregister errors for my_error() */
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extern void my_handler_error_register(void);
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extern void my_handler_error_unregister(void);
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#endif /* _my_handler_h */
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