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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/* SPDX-FileCopyrightText: 2004-2015 Simon Wunderlich <sw@simonwunderlich.de>
* SPDX-FileCopyrightText: 2004-2015 Marek Lindner <mareklindner@neomailbox.ch>
*/
#ifndef _S3D_HASH_H
#define _S3D_HASH_H
typedef int (*hashdata_compare_cb)(const void *, const void *);
typedef int (*hashdata_choose_cb)(const void *, int);
typedef void (*hashdata_free_cb)(void *);
struct element_t {
void *data; /* pointer to the data */
struct element_t *next; /* overflow bucket pointer */
};
struct hash_it_t {
int index;
struct element_t *bucket;
struct element_t *prev_bucket;
struct element_t **first_bucket;
};
struct hashtable_t {
struct element_t **table; /* the hashtable itself, with the buckets */
int elements; /* number of elements registered */
int size; /* size of hashtable */
hashdata_compare_cb compare; /* callback to a compare function.
* should compare 2 element datas for their keys,
* return 0 if same and not 0 if not same */
hashdata_choose_cb choose; /* the hashfunction, should return an index based
* on the key in the data of the first argument
* and the size the second */
};
/* clears the hash */
void _s3d_hash_init(struct hashtable_t *hash);
/* allocates and clears the hash */
struct hashtable_t *_s3d_hash_new(int size, hashdata_compare_cb compare, hashdata_choose_cb choose);
/* remove bucket (this might be used in hash_iterate() if you already found the bucket
* you want to delete and don't need the overhead to find it again with hash_remove().
* But usually, you don't want to use this function, as it fiddles with hash-internals. */
void *_s3d_hash_remove_bucket(struct hashtable_t *hash, struct hash_it_t *hash_it_t);
/* remove the hash structure. if hashdata_free_cb != NULL,
* this function will be called to remove the elements inside of the hash.
* if you don't remove the elements, memory might be leaked. */
void _s3d_hash_delete(struct hashtable_t *hash, hashdata_free_cb free_cb);
/* free only the hashtable and the hash itself. */
void _s3d_hash_destroy(struct hashtable_t *hash);
/* adds data to the hashtable. returns 0 on success, -1 on error */
int _s3d_hash_add(struct hashtable_t *hash, void *data);
/* removes data from hash, if found. returns pointer do data on success,
* so you can remove the used structure yourself, or NULL on error .
* data could be the structure you use with just the key filled,
* we just need the key for comparing. */
void *_s3d_hash_remove(struct hashtable_t *hash, void *data);
/* finds data, based on the key in keydata. returns the found data on success, or NULL on error */
void *_s3d_hash_find(struct hashtable_t *hash, void *keydata);
/* resize the hash, returns the pointer to the new hash or NULL on error. removes the old hash on success */
struct hashtable_t *_s3d_hash_resize(struct hashtable_t *hash, int size);
/* print the hash table for debugging */
void _s3d_hash_debug(struct hashtable_t *hash);
/* iterate though the hash. first element is selected with iter_in NULL.
* use the returned iterator to access the elements until hash_it_t returns NULL. */
struct hash_it_t *_s3d_hash_iterate(struct hashtable_t *hash, struct hash_it_t *iter_in);
#endif
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