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src/libmysql_macosx/include/hash.h
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00001 /* Copyright (C) 2000 MySQL AB
00002 
00003    This program is free software; you can redistribute it and/or modify
00004    it under the terms of the GNU General Public License as published by
00005    the Free Software Foundation; either version 2 of the License, or
00006    (at your option) any later version.
00007 
00008    This program is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011    GNU General Public License for more details.
00012 
00013    You should have received a copy of the GNU General Public License
00014    along with this program; if not, write to the Free Software
00015    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
00016 
00017 /* Dynamic hashing of record with different key-length */
00018 
00019 #ifndef _hash_h
00020 #define _hash_h
00021 #ifdef  __cplusplus
00022 extern "C" {
00023 #endif
00024 
00025 /*
00026   Overhead to store an element in hash
00027   Can be used to approximate memory consumption for a hash
00028  */
00029 #define HASH_OVERHEAD (sizeof(char*)*2)
00030 
00031 typedef byte *(*hash_get_key)(const byte *,uint*,my_bool);
00032 typedef void (*hash_free_key)(void *);
00033 
00034 typedef struct st_hash {
00035   uint key_offset,key_length;           /* Length of key if const length */
00036   uint records,blength,current_record;
00037   uint flags;
00038   DYNAMIC_ARRAY array;                          /* Place for hash_keys */
00039   hash_get_key get_key;
00040   void (*free)(void *);
00041   CHARSET_INFO *charset;
00042 } HASH;
00043 
00044 #define hash_init(A,B,C,D,E,F,G,H) _hash_init(A,B,C,D,E,F,G, H CALLER_INFO)
00045 my_bool _hash_init(HASH *hash, CHARSET_INFO *charset,
00046                    uint default_array_elements, uint key_offset,
00047                    uint key_length, hash_get_key get_key,
00048                    void (*free_element)(void*), uint flags CALLER_INFO_PROTO);
00049 void hash_free(HASH *tree);
00050 void my_hash_reset(HASH *hash);
00051 byte *hash_element(HASH *hash,uint idx);
00052 gptr hash_search(HASH *info,const byte *key,uint length);
00053 gptr hash_next(HASH *info,const byte *key,uint length);
00054 my_bool my_hash_insert(HASH *info,const byte *data);
00055 my_bool hash_delete(HASH *hash,byte *record);
00056 my_bool hash_update(HASH *hash,byte *record,byte *old_key,uint old_key_length);
00057 void hash_replace(HASH *hash, uint idx, byte *new_row);
00058 my_bool hash_check(HASH *hash);                 /* Only in debug library */
00059 
00060 #define hash_clear(H) bzero((char*) (H),sizeof(*(H)))
00061 #define hash_inited(H) ((H)->array.buffer != 0)
00062 
00063 #ifdef  __cplusplus
00064 }
00065 #endif
00066 #endif
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