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| Rev | Author | Line No. | Line |
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| 996 | cejka | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2006 Jakub Jermar |
| 996 | cejka | 3 | * All rights reserved. |
| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 1866 | jermar | 29 | /** @addtogroup libc |
| 1653 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 1866 | jermar | 35 | #ifndef LIBC_HASH_TABLE_H_ |
| 36 | #define LIBC_HASH_TABLE_H_ |
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| 996 | cejka | 37 | |
| 1335 | jermar | 38 | #include <libadt/list.h> |
| 996 | cejka | 39 | #include <unistd.h> |
| 40 | |||
| 41 | typedef unsigned long hash_count_t; |
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| 42 | typedef unsigned long hash_index_t; |
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| 43 | typedef struct hash_table hash_table_t; |
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| 44 | typedef struct hash_table_operations hash_table_operations_t; |
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| 45 | |||
| 46 | /** Hash table structure. */ |
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| 47 | struct hash_table { |
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| 48 | link_t *entry; |
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| 49 | hash_count_t entries; |
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| 50 | hash_count_t max_keys; |
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| 51 | hash_table_operations_t *op; |
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| 52 | }; |
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| 53 | |||
| 54 | /** Set of operations for hash table. */ |
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| 55 | struct hash_table_operations { |
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| 56 | /** Hash function. |
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| 57 | * |
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| 58 | * @param key Array of keys needed to compute hash index. All keys must be passed. |
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| 59 | * |
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| 60 | * @return Index into hash table. |
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| 61 | */ |
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| 997 | cejka | 62 | hash_index_t (* hash)(unsigned long key[]); |
| 996 | cejka | 63 | |
| 64 | /** Hash table item comparison function. |
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| 65 | * |
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| 66 | * @param key Array of keys that will be compared with item. It is not necessary to pass all keys. |
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| 67 | * |
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| 68 | * @return true if the keys match, false otherwise. |
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| 69 | */ |
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| 997 | cejka | 70 | int (*compare)(unsigned long key[], hash_count_t keys, link_t *item); |
| 996 | cejka | 71 | |
| 72 | /** Hash table item removal callback. |
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| 73 | * |
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| 74 | * @param item Item that was removed from the hash table. |
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| 75 | */ |
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| 76 | void (*remove_callback)(link_t *item); |
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| 77 | }; |
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| 78 | |||
| 79 | #define hash_table_get_instance(item, type, member) list_get_instance((item), type, member) |
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| 80 | |||
| 997 | cejka | 81 | extern int hash_table_create(hash_table_t *h, hash_count_t m, hash_count_t max_keys, hash_table_operations_t *op); |
| 82 | extern void hash_table_insert(hash_table_t *h, unsigned long key[], link_t *item); |
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| 83 | extern link_t *hash_table_find(hash_table_t *h, unsigned long key[]); |
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| 84 | extern void hash_table_remove(hash_table_t *h, unsigned long key[], hash_count_t keys); |
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| 996 | cejka | 85 | |
| 86 | #endif |
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| 1653 | cejka | 87 | |
| 1866 | jermar | 88 | /** @} |
| 1653 | cejka | 89 | */ |