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my_handler.h
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/* Copyright (C) 2002-2006 MySQL AB
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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., 51 Franklin Place - Suite 330, Boston,
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MA 02110-1301, USA */
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#pragma once
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#include <drizzled/charset.h>
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#include <plugin/myisam/myisampack.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 MI_MAX_POSSIBLE_KEY_BUFF and HA_MAX_KEY_LENGTH.
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*/
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#define HA_MAX_KEY_LENGTH 1332
/* Max length in bytes */
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#define HA_MAX_KEY_SEG 16
/* 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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typedef
struct
st_HA_KEYSEG
/* Key-portion */
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{
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const
drizzled::charset_info_st
*charset;
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uint32_t start;
/* Start of key in record */
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uint32_t null_pos;
/* position to NULL indicator */
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uint16_t bit_pos;
/* Position to bit part */
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uint16_t flag;
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uint16_t length;
/* Keylength */
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uint8_t type;
/* Type of key (for sort) */
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uint8_t language;
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uint8_t null_bit;
/* bitmask to test for NULL */
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uint8_t bit_start,bit_end;
/* if bit field */
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uint8_t bit_length;
/* Length of bit part */
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}
HA_KEYSEG
;
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#define get_key_length(length,key) \
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{ if (*(unsigned char*) (key) != 255) \
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length= (uint) *(unsigned char*) ((key)++); \
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else \
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{ length= mi_uint2korr((key)+1); (key)+=3; } \
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}
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#define get_key_length_rdonly(length,key) \
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{ if (*(unsigned char*) (key) != 255) \
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length= ((uint) *(unsigned char*) ((key))); \
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else \
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{ length= mi_uint2korr((key)+1); } \
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}
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#define get_key_pack_length(length,length_pack,key) \
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{ if (*(unsigned char*) (key) != 255) \
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{ length= (uint) *(unsigned char*) ((key)++); length_pack= 1; }\
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else \
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{ length=mi_uint2korr((key)+1); (key)+= 3; length_pack= 3; } \
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}
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#define store_key_length_inc(key,length) \
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{ if ((length) < 255) \
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{ *(key)++= (length); } \
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else \
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{ *(key)=255; mi_int2store((key)+1,(length)); (key)+=3; } \
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}
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#define size_to_store_key_length(length) ((length) < 255 ? 1 : 3)
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#define get_rec_bits(bit_ptr, bit_ofs, bit_len) \
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(((((uint16_t) (bit_ptr)[1] << 8) | (uint16_t) (bit_ptr)[0]) >> (bit_ofs)) & \
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((1 << (bit_len)) - 1))
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#define set_rec_bits(bits, bit_ptr, bit_ofs, bit_len) \
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{ \
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(bit_ptr)[0]= ((bit_ptr)[0] & ~(((1 << (bit_len)) - 1) << (bit_ofs))) | \
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((bits) << (bit_ofs)); \
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if ((bit_ofs) + (bit_len) > 8) \
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(bit_ptr)[1]= ((bit_ptr)[1] & ~((1 << ((bit_len) - 8 + (bit_ofs))) - 1)) | \
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((bits) >> (8 - (bit_ofs))); \
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}
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#define clr_rec_bits(bit_ptr, bit_ofs, bit_len) \
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set_rec_bits(0, bit_ptr, bit_ofs, bit_len)
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extern
int
ha_compare_text(
const
drizzled::charset_info_st
*
const
,
unsigned
char
*, uint,
unsigned
char
*, uint,
bool
,
bool
);
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extern
HA_KEYSEG
*ha_find_null(
HA_KEYSEG
*keyseg,
unsigned
char
*a);
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void
my_handler_error_register(
void
);
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extern
int
ha_key_cmp(
HA_KEYSEG
*keyseg,
unsigned
char
*a,
unsigned
char
*b,
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uint32_t key_length,uint32_t nextflag,uint32_t *diff_length);
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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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drizzled::charset_info_st
Definition:
charset.h:228
st_HA_KEYSEG
Definition:
my_handler.h:45
plugin
myisam
my_handler.h
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