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790 jermar 1 
/*
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 * Copyright (c) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genericadt
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_HASH_TABLE_H_
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#define KERN_HASH_TABLE_H_
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#include <adt/list.h>
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#include <arch/types.h>
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/** Set of operations for hash table. */
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typedef struct {
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    /** Hash function.
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     *
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     * @param key   Array of keys needed to compute hash index. All keys must
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     *      be passed.
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     *
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     * @return Index into hash table.
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     */
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    size_t (* hash)(unative_t key[]);
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    /** Hash table item comparison function.
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     *
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     * @param key   Array of keys that will be compared with item. It is not
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     *      necessary to pass all keys.
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     *
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     * @return true if the keys match, false otherwise.
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     */
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    bool (*compare)(unative_t key[], size_t keys, link_t *item);
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    /** Hash table item removal callback.
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     *
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     * @param item Item that was removed from the hash table.
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     */
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    void (*remove_callback)(link_t *item);
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} hash_table_operations_t;
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/** Hash table structure. */
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typedef struct {
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    link_t *entry;
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    size_t entries;
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    size_t max_keys;
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    hash_table_operations_t *op;
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} hash_table_t;
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#define hash_table_get_instance(item, type, member) \
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    list_get_instance((item), type, member)
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extern void hash_table_create(hash_table_t *h, size_t m, size_t max_keys,
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    hash_table_operations_t *op);
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extern void hash_table_insert(hash_table_t *h, unative_t key[], link_t *item);
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extern link_t *hash_table_find(hash_table_t *h, unative_t key[]);
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extern void hash_table_remove(hash_table_t *h, unative_t key[], size_t keys);
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#endif
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/** @}
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 */