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Diffstat (limited to 'dep/mysqllite/include/hash.h')
| -rw-r--r-- | dep/mysqllite/include/hash.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/dep/mysqllite/include/hash.h b/dep/mysqllite/include/hash.h new file mode 100644 index 00000000000..629b404e8a7 --- /dev/null +++ b/dep/mysqllite/include/hash.h @@ -0,0 +1,116 @@ +/* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; 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 + +/* + There was a problem on MacOSX with a shared object ha_example.so. + It used hash_search(). During build of ha_example.so no libmysys + was specified. Since MacOSX had a hash_search() in the system + library, it built the shared object so that the dynamic linker + linked hash_search() to the system library, which caused a crash + when called. To come around this, we renamed hash_search() to + my_hash_search(), as we did long ago with hash_insert() and + hash_reset(). However, this time we made the move complete with + all names. To keep compatibility, we redefine the old names. + Since every C and C++ file, that uses HASH, needs to include + this file, the change is complete. Both names could be used + in the code, but the my_* versions are recommended now. +*/ +#define hash_get_key my_hash_get_key +#define hash_free_key my_hash_free_key +#define hash_init my_hash_init +#define hash_init2 my_hash_init2 +#define _hash_init _my_hash_init +#define hash_free my_hash_free +#define hash_reset my_hash_reset +#define hash_element my_hash_element +#define hash_search my_hash_search +#define hash_first my_hash_first +#define hash_next my_hash_next +#define hash_insert my_hash_insert +#define hash_delete my_hash_delete +#define hash_update my_hash_update +#define hash_replace my_hash_replace +#define hash_check my_hash_check +#define hash_clear my_hash_clear +#define hash_inited my_hash_inited +#define hash_init_opt my_hash_init_opt + +/* + Overhead to store an element in hash + Can be used to approximate memory consumption for a hash + */ +#define HASH_OVERHEAD (sizeof(char*)*2) + +/* flags for hash_init */ +#define HASH_UNIQUE 1 /* hash_insert fails on duplicate key */ + +typedef uchar *(*my_hash_get_key)(const uchar *,size_t*,my_bool); +typedef void (*my_hash_free_key)(void *); + +typedef struct st_hash { + size_t key_offset,key_length; /* Length of key if const length */ + size_t blength; + ulong records; + uint flags; + DYNAMIC_ARRAY array; /* Place for hash_keys */ + my_hash_get_key get_key; + void (*free)(void *); + CHARSET_INFO *charset; +} HASH; + +/* A search iterator state */ +typedef uint HASH_SEARCH_STATE; + +#define my_hash_init(A,B,C,D,E,F,G,H) \ + _my_hash_init(A,0,B,C,D,E,F,G,H CALLER_INFO) +#define my_hash_init2(A,B,C,D,E,F,G,H,I) \ + _my_hash_init(A,B,C,D,E,F,G,H,I CALLER_INFO) +my_bool _my_hash_init(HASH *hash, uint growth_size, CHARSET_INFO *charset, + ulong default_array_elements, size_t key_offset, + size_t key_length, my_hash_get_key get_key, + void (*free_element)(void*), + uint flags CALLER_INFO_PROTO); +void my_hash_free(HASH *tree); +void my_hash_reset(HASH *hash); +uchar *my_hash_element(HASH *hash, ulong idx); +uchar *my_hash_search(const HASH *info, const uchar *key, size_t length); +uchar *my_hash_first(const HASH *info, const uchar *key, size_t length, + HASH_SEARCH_STATE *state); +uchar *my_hash_next(const HASH *info, const uchar *key, size_t length, + HASH_SEARCH_STATE *state); +my_bool my_hash_insert(HASH *info, const uchar *data); +my_bool my_hash_delete(HASH *hash, uchar *record); +my_bool my_hash_update(HASH *hash, uchar *record, uchar *old_key, + size_t old_key_length); +void my_hash_replace(HASH *hash, HASH_SEARCH_STATE *state, uchar *new_row); +my_bool my_hash_check(HASH *hash); /* Only in debug library */ + +#define my_hash_clear(H) bzero((char*) (H), sizeof(*(H))) +#define my_hash_inited(H) ((H)->blength != 0) +#define my_hash_init_opt(A,B,C,D,E,F,G,H) \ + (!my_hash_inited(A) && _my_hash_init(A,0,B,C,D,E,F,G, H CALLER_INFO)) + +#ifdef __cplusplus +} +#endif +#endif |