309 lines
6.5 KiB
C
309 lines
6.5 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2003, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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#include "setup.h"
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#include <string.h>
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#include <stdlib.h>
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#include "hash.h"
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#include "llist.h"
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#ifdef MALLOCDEBUG
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/* this must be the last include file */
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#include "memdebug.h"
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#endif
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/* {{{ static unsigned long _hash_str (const char *, size_t)
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*/
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static unsigned long
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_hash_str (const char *key, size_t key_length)
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{
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char *end = (char *) key + key_length;
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unsigned long h = 5381;
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while (key < end) {
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h += h << 5;
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h ^= (unsigned long) *key++;
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}
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return h;
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}
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/* }}} */
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/* {{{ static void _hash_element_dtor (void *, void *)
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*/
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static void
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_hash_element_dtor (void *user, void *element)
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{
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curl_hash *h = (curl_hash *) user;
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curl_hash_element *e = (curl_hash_element *) element;
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if (e->key) {
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free(e->key);
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}
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h->dtor(e->ptr);
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free(e);
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}
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/* }}} */
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/* {{{ void curl_hash_init (curl_hash *, int, curl_hash_dtor)
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*/
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void
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Curl_hash_init (curl_hash *h, int slots, curl_hash_dtor dtor)
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{
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int i;
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h->dtor = dtor;
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h->size = 0;
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h->slots = slots;
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h->table = (curl_llist **) malloc(slots * sizeof(curl_llist *));
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for (i = 0; i < slots; ++i) {
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h->table[i] = Curl_llist_alloc((curl_llist_dtor) _hash_element_dtor);
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}
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}
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/* }}} */
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/* {{{ curl_hash *curl_hash_alloc (int, curl_hash_dtor)
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*/
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curl_hash *
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Curl_hash_alloc (int slots, curl_hash_dtor dtor)
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{
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curl_hash *h;
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h = (curl_hash *) malloc(sizeof(curl_hash));
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if (NULL == h)
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return NULL;
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Curl_hash_init(h, slots, dtor);
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return h;
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}
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/* }}} */
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/* {{{ static int _hash_key_compare (char *, size_t, char *, size_t)
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*/
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static int
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_hash_key_compare (char *key1, size_t key1_len, char *key2, size_t key2_len)
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{
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if (key1_len == key2_len &&
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*key1 == *key2 &&
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memcmp(key1, key2, key1_len) == 0) {
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return 1;
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}
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return 0;
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}
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/* }}} */
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/* {{{ static int _mk_hash_element (curl_hash_element **, char *, size_t, const void *)
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*/
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static int
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_mk_hash_element (curl_hash_element **e, char *key, size_t key_len, const void *p)
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{
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*e = (curl_hash_element *) malloc(sizeof(curl_hash_element));
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(*e)->key = strdup(key);
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(*e)->key_len = key_len;
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(*e)->ptr = (void *) p;
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return 0;
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}
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/* }}} */
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#define find_slot(__h, __k, __k_len) (_hash_str(__k, __k_len) % (__h)->slots)
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#define FETCH_LIST \
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curl_llist *l = h->table[find_slot(h, key, key_len)]
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/* {{{ int curl_hash_add (curl_hash *, char *, size_t, const void *)
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*/
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int
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Curl_hash_add (curl_hash *h, char *key, size_t key_len, const void *p)
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{
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curl_hash_element *he;
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curl_llist_element *le;
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FETCH_LIST;
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for (le = CURL_LLIST_HEAD(l);
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le != NULL;
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le = CURL_LLIST_NEXT(le)) {
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he = (curl_hash_element *) CURL_LLIST_VALP(le);
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if (_hash_key_compare(he->key, he->key_len, key, key_len)) {
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h->dtor(he->ptr);
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he->ptr = (void *) p;
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return 1;
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}
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}
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if (_mk_hash_element(&he, key, key_len, p) != 0)
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return 0;
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if (Curl_llist_insert_next(l, CURL_LLIST_TAIL(l), he)) {
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++h->size;
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return 1;
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}
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return 0;
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}
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/* }}} */
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/* {{{ int curl_hash_delete (curl_hash *, char *, size_t)
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*/
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int
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Curl_hash_delete(curl_hash *h, char *key, size_t key_len)
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{
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curl_hash_element *he;
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curl_llist_element *le;
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FETCH_LIST;
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for (le = CURL_LLIST_HEAD(l);
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le != NULL;
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le = CURL_LLIST_NEXT(le)) {
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he = CURL_LLIST_VALP(le);
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if (_hash_key_compare(he->key, he->key_len, key, key_len)) {
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Curl_llist_remove(l, le, (void *) h);
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--h->size;
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return 1;
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}
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}
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return 0;
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}
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/* }}} */
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/* {{{ int curl_hash_pick (curl_hash *, char *, size_t, void **)
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*/
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void *
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Curl_hash_pick(curl_hash *h, char *key, size_t key_len)
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{
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curl_llist_element *le;
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curl_hash_element *he;
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FETCH_LIST;
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for (le = CURL_LLIST_HEAD(l);
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le != NULL;
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le = CURL_LLIST_NEXT(le)) {
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he = CURL_LLIST_VALP(le);
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if (_hash_key_compare(he->key, he->key_len, key, key_len)) {
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return he->ptr;
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}
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}
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return NULL;
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}
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/* }}} */
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/* {{{ void curl_hash_apply (curl_hash *, void *, void (*)(void *, curl_hash_element *))
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*/
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void
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Curl_hash_apply(curl_hash *h, void *user,
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void (*cb)(void *user, void *ptr))
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{
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curl_llist_element *le;
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int i;
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for (i = 0; i < h->slots; ++i) {
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for (le = CURL_LLIST_HEAD(h->table[i]);
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le != NULL;
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le = CURL_LLIST_NEXT(le)) {
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curl_hash_element *el = CURL_LLIST_VALP(le);
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cb(user, el->ptr);
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}
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}
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}
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/* }}} */
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/* {{{ void curl_hash_clean (curl_hash *)
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*/
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void
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Curl_hash_clean(curl_hash *h)
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{
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int i;
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for (i = 0; i < h->slots; ++i) {
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Curl_llist_destroy(h->table[i], (void *) h);
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}
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free(h->table);
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}
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/* }}} */
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/* {{{ void curl_hash_clean_with_criterium (curl_hash *, void *,
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int (*)(void *, void *))
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*/
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void
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Curl_hash_clean_with_criterium(curl_hash *h, void *user,
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int (*comp)(void *, void *))
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{
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curl_llist_element *le;
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curl_llist_element *lnext;
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int i;
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for (i = 0; i < h->slots; ++i) {
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le = CURL_LLIST_HEAD(h->table[i]);
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while(le != NULL)
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if (comp(user, ((curl_hash_element *) CURL_LLIST_VALP(le))->ptr)) {
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lnext = CURL_LLIST_NEXT(le);
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Curl_llist_remove(h->table[i], le, (void *) h);
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--h->size;
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le = lnext;
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}
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else
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le = CURL_LLIST_NEXT(le);
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}
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}
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/* {{{ int curl_hash_count (curl_hash *)
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*/
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int
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Curl_hash_count(curl_hash *h)
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{
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return h->size;
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}
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/* }}} */
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/* {{{ void curl_hash_destroy (curl_hash *)
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*/
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void
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Curl_hash_destroy(curl_hash *h)
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{
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if (!h)
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return;
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Curl_hash_clean(h);
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free(h);
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}
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/* }}} */
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/*
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* local variables:
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* eval: (load-file "../curl-mode.el")
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* end:
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* vim600: fdm=marker
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* vim: et sw=2 ts=2 sts=2 tw=78
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*/
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