101 lines
3.7 KiB
C
101 lines
3.7 KiB
C
/*
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* Copyright (C) 2006-2010 B.A.T.M.A.N. contributors:
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*
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* Simon Wunderlich, Marek Lindner
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#ifndef _NET_BATMAN_ADV_HASH_H_
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#define _NET_BATMAN_ADV_HASH_H_
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#define HASHIT(name) struct hash_it_t name = { \
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.index = -1, .bucket = NULL, \
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.prev_bucket = NULL, \
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.first_bucket = NULL }
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typedef int (*hashdata_compare_cb)(void *, void *);
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typedef int (*hashdata_choose_cb)(void *, int);
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typedef void (*hashdata_free_cb)(void *);
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struct element_t {
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void *data; /* pointer to the data */
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struct element_t *next; /* overflow bucket pointer */
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};
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struct hash_it_t {
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int index;
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struct element_t *bucket;
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struct element_t *prev_bucket;
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struct element_t **first_bucket;
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};
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struct hashtable_t {
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struct element_t **table; /* the hashtable itself, with the buckets */
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int elements; /* number of elements registered */
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int size; /* size of hashtable */
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hashdata_compare_cb compare;/* callback to a compare function. should
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* compare 2 element datas for their keys,
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* return 0 if same and not 0 if not
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* same */
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hashdata_choose_cb choose; /* the hashfunction, should return an index
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* based on the key in the data of the first
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* argument and the size the second */
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};
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/* allocates and clears the hash */
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struct hashtable_t *hash_new(int size, hashdata_compare_cb compare,
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hashdata_choose_cb choose);
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/* remove bucket (this might be used in hash_iterate() if you already found the
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* bucket you want to delete and don't need the overhead to find it again with
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* hash_remove(). But usually, you don't want to use this function, as it
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* fiddles with hash-internals. */
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void *hash_remove_bucket(struct hashtable_t *hash, struct hash_it_t *hash_it_t);
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/* remove the hash structure. if hashdata_free_cb != NULL, this function will be
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* called to remove the elements inside of the hash. if you don't remove the
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* elements, memory might be leaked. */
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void hash_delete(struct hashtable_t *hash, hashdata_free_cb free_cb);
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/* free only the hashtable and the hash itself. */
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void hash_destroy(struct hashtable_t *hash);
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/* adds data to the hashtable. returns 0 on success, -1 on error */
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int hash_add(struct hashtable_t *hash, void *data);
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/* removes data from hash, if found. returns pointer do data on success, so you
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* can remove the used structure yourself, or NULL on error . data could be the
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* structure you use with just the key filled, we just need the key for
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* comparing. */
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void *hash_remove(struct hashtable_t *hash, void *data);
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/* finds data, based on the key in keydata. returns the found data on success,
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* or NULL on error */
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void *hash_find(struct hashtable_t *hash, void *keydata);
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/* resize the hash, returns the pointer to the new hash or NULL on
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* error. removes the old hash on success */
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struct hashtable_t *hash_resize(struct hashtable_t *hash, int size);
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/* iterate though the hash. first element is selected with iter_in NULL. use
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* the returned iterator to access the elements until hash_it_t returns NULL. */
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struct hash_it_t *hash_iterate(struct hashtable_t *hash,
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struct hash_it_t *iter_in);
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#endif /* _NET_BATMAN_ADV_HASH_H_ */
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