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996 | cejka | 1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
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3 | * All rights reserved. |
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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 | |||
1653 | cejka | 29 | /** @addtogroup libc |
30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
996 | cejka | 35 | #ifndef __HASH_TABLE_H__ |
36 | #define __HASH_TABLE_H__ |
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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 | |
88 | |||
89 | /** @} |
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90 | */ |
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91 | |||
92 |