/*
* Copyright (C) 2006 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __HASH_TABLE_H__
#define __HASH_TABLE_H__
#include <arch/types.h>
#include <typedefs.h>
#include <adt/list.h>
/** Hash table structure. */
struct hash_table {
link_t *entry;
count_t entries;
count_t max_keys;
hash_table_operations_t *op;
};
/** Set of operations for hash table. */
struct hash_table_operations {
/** Hash function.
*
* @param key Array of keys needed to compute hash index. All keys must be passed.
*
* @return Index into hash table.
*/
index_t (* hash)(__native key[]);
/** Hash table item comparison function.
*
* @param key Array of keys that will be compared against item. It is not necessary to pass all keys.
*
* @return true if the keys match, false otherwise.
*/
bool (*compare)(__native key[], count_t keys, link_t *item);
/** Hash table item removal callback.
*
* @param item Item that was removed from the hash table.
*/
void (*remove_callback)(link_t *item);
};
#define hash_table_get_instance(item, type, member) list_get_instance((item), (type), (member))
extern void hash_table_create(hash_table_t *h, count_t m, count_t max_keys, hash_table_operations_t *op);
extern bool hash_table_insert(hash_table_t *h, __native key[], link_t *item);
extern link_t *hash_table_find(hash_table_t *h, __native key[]);
extern void hash_table_remove(hash_table_t *h, __native key[], count_t keys);
#endif