1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA */
/* Dynamic hashing of record with different key-length */
#ifndef _hash_h
#define _hash_h
#ifdef __cplusplus
extern "C" {
#endif
typedef byte *(*hash_get_key)(const byte *,uint*,my_bool);
typedef void (*hash_free_key)(void *);
/* flags for hash_init */
#define HASH_CASE_INSENSITIVE 1
typedef struct st_hash_info {
uint next; /* index to next key */
byte *data; /* data for current entry */
} HASH_LINK;
typedef struct st_hash {
uint key_offset,key_length; /* Length of key if const length */
uint records,blength,current_record;
uint flags;
DYNAMIC_ARRAY array; /* Place for hash_keys */
hash_get_key get_key;
void (*free)(void *);
uint (*calc_hashnr)(const byte *key,uint length);
} HASH;
my_bool hash_init(HASH *hash,uint default_array_elements, uint key_offset,
uint key_length, hash_get_key get_key,
void (*free_element)(void*), uint flags);
void hash_free(HASH *tree);
byte *hash_element(HASH *hash,uint idx);
gptr hash_search(HASH *info,const byte *key,uint length);
gptr hash_next(HASH *info,const byte *key,uint length);
my_bool hash_insert(HASH *info,const byte *data);
my_bool hash_delete(HASH *hash,byte *record);
my_bool hash_update(HASH *hash,byte *record,byte *old_key,uint old_key_length);
my_bool hash_check(HASH *hash); /* Only in debug library */
#define hash_clear(H) bzero((char*) (H),sizeof(*(H)))
#define hash_inited(H) ((H)->array.buffer != 0)
#ifdef __cplusplus
}
#endif
#endif
|
