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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef LIBC_HASH_TABLE_H_
  36. #define LIBC_HASH_TABLE_H_
  37.  
  38. #include <libadt/list.h>
  39. #include <unistd.h>
  40.  
  41. typedef unsigned long hash_count_t;
  42. typedef unsigned long hash_index_t;
  43. typedef struct hash_table hash_table_t;
  44. typedef struct hash_table_operations hash_table_operations_t;
  45.  
  46. /** Hash table structure. */
  47. struct hash_table {
  48.     link_t *entry;
  49.     hash_count_t entries;
  50.     hash_count_t max_keys;
  51.     hash_table_operations_t *op;
  52. };
  53.  
  54. /** Set of operations for hash table. */
  55. struct hash_table_operations {
  56.     /** Hash function.
  57.      *
  58.      * @param key   Array of keys needed to compute hash index. All keys
  59.      *      must be passed.
  60.      *
  61.      * @return  Index into hash table.
  62.      */
  63.     hash_index_t (* hash)(unsigned long key[]);
  64.    
  65.     /** Hash table item comparison function.
  66.      *
  67.      * @param key   Array of keys that will be compared with item. It is
  68.      *      not necessary to pass all keys.
  69.      *
  70.      * @return  true if the keys match, false otherwise.
  71.      */
  72.     int (*compare)(unsigned long key[], hash_count_t keys, link_t *item);
  73.  
  74.     /** Hash table item removal callback.
  75.      *
  76.      * @param item  Item that was removed from the hash table.
  77.      */
  78.     void (*remove_callback)(link_t *item);
  79. };
  80.  
  81. #define hash_table_get_instance(item, type, member) list_get_instance((item), type, member)
  82.  
  83. extern int hash_table_create(hash_table_t *h, hash_count_t m, hash_count_t max_keys, hash_table_operations_t *op);
  84. extern void hash_table_insert(hash_table_t *h, unsigned long key[], link_t *item);
  85. extern link_t *hash_table_find(hash_table_t *h, unsigned long key[]);
  86. extern void hash_table_remove(hash_table_t *h, unsigned long key[], hash_count_t keys);
  87.  
  88. #endif
  89.  
  90. /** @}
  91.  */
  92.