335 строки
7.7 KiB
C
335 строки
7.7 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 - 2007, 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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#include "memory.h"
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/* this must be the last include file */
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#include "memdebug.h"
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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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struct curl_hash *h = (struct curl_hash *) user;
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struct curl_hash_element *e = (struct curl_hash_element *) element;
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if (e->key)
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free(e->key);
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h->dtor(e->ptr);
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free(e);
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}
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/* return 1 on error, 0 is fine */
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int
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Curl_hash_init(struct curl_hash *h,
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int slots,
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hash_function hfunc,
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comp_function comparator,
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curl_hash_dtor dtor)
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{
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int i;
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if (!slots || !hfunc || !comparator ||!dtor) {
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return 1; /* failure */
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}
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h->hash_func = hfunc;
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h->comp_func = comparator;
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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 = (struct curl_llist **) malloc(slots * sizeof(struct curl_llist *));
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if(h->table) {
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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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if(!h->table[i]) {
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while(i--)
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Curl_llist_destroy(h->table[i], NULL);
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free(h->table);
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return 1; /* failure */
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}
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}
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return 0; /* fine */
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}
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else
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return 1; /* failure */
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}
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struct curl_hash *
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Curl_hash_alloc(int slots,
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hash_function hfunc,
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comp_function comparator,
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curl_hash_dtor dtor)
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{
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struct curl_hash *h;
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if (!slots || !hfunc || !comparator ||!dtor) {
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return NULL; /* failure */
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}
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h = (struct curl_hash *) malloc(sizeof(struct curl_hash));
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if (h) {
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if(Curl_hash_init(h, slots, hfunc, comparator, dtor)) {
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/* failure */
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free(h);
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h = NULL;
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}
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}
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return h;
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}
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static struct curl_hash_element *
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mk_hash_element(const void *key, size_t key_len, const void *p)
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{
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struct curl_hash_element *he =
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(struct curl_hash_element *) malloc(sizeof(struct curl_hash_element));
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if(he) {
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void *dupkey = malloc(key_len);
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if(dupkey) {
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/* copy the key */
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memcpy(dupkey, key, key_len);
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he->key = dupkey;
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he->key_len = key_len;
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he->ptr = (void *) p;
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}
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else {
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/* failed to duplicate the key, free memory and fail */
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free(he);
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he = NULL;
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}
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}
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return he;
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}
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#define FETCH_LIST(x,y,z) x->table[x->hash_func(y, z, x->slots)]
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/* Return the data in the hash. If there already was a match in the hash,
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that data is returned. */
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void *
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Curl_hash_add(struct curl_hash *h, void *key, size_t key_len, void *p)
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{
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struct curl_hash_element *he;
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struct curl_llist_element *le;
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struct curl_llist *l = FETCH_LIST (h, key, key_len);
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for (le = l->head; le; le = le->next) {
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he = (struct curl_hash_element *) le->ptr;
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if (h->comp_func(he->key, he->key_len, key, key_len)) {
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h->dtor(p); /* remove the NEW entry */
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return he->ptr; /* return the EXISTING entry */
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}
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}
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he = mk_hash_element(key, key_len, p);
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if (he) {
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if(Curl_llist_insert_next(l, l->tail, he)) {
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++h->size;
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return p; /* return the new entry */
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}
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/*
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* Couldn't insert it, destroy the 'he' element and the key again. We
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* don't call hash_element_dtor() since that would also call the
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* "destructor" for the actual data 'p'. When we fail, we shall not touch
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* that data.
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*/
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free(he->key);
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free(he);
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}
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return NULL; /* failure */
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}
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/* remove the identified hash entry, returns non-zero on failure */
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int Curl_hash_delete(struct curl_hash *h, void *key, size_t key_len)
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{
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struct curl_llist_element *le;
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struct curl_hash_element *he;
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struct curl_llist *l = FETCH_LIST(h, key, key_len);
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for (le = l->head; le; le = le->next) {
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he = le->ptr;
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if (h->comp_func(he->key, he->key_len, key, key_len)) {
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Curl_llist_remove(l, le, (void *) h);
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return 0;
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}
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}
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return 1;
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}
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void *
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Curl_hash_pick(struct curl_hash *h, void *key, size_t key_len)
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{
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struct curl_llist_element *le;
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struct curl_hash_element *he;
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struct curl_llist *l = FETCH_LIST(h, key, key_len);
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for (le = l->head; le; le = le->next) {
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he = le->ptr;
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if (h->comp_func(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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#if defined(CURLDEBUG) && defined(AGGRESIVE_TEST)
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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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struct 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 = (h->table[i])->head;
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le;
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le = le->next) {
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curl_hash_element *el = le->ptr;
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cb(user, el->ptr);
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}
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}
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}
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#endif
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void
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Curl_hash_clean(struct 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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void
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Curl_hash_clean_with_criterium(struct curl_hash *h, void *user,
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int (*comp)(void *, void *))
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{
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struct curl_llist_element *le;
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struct curl_llist_element *lnext;
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struct curl_llist *list;
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int i;
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for (i = 0; i < h->slots; ++i) {
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list = h->table[i];
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le = list->head; /* get first list entry */
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while(le) {
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struct curl_hash_element *he = le->ptr;
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lnext = le->next;
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/* ask the callback function if we shall remove this entry or not */
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if (comp(user, he->ptr)) {
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Curl_llist_remove(list, le, (void *) h);
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--h->size; /* one less entry in the hash now */
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}
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le = lnext;
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}
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}
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}
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void
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Curl_hash_destroy(struct 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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size_t Curl_hash_str(void* key, size_t key_length, size_t slots_num)
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{
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const char* key_str = (const char *) key;
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const char *end = key_str + key_length;
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unsigned long h = 5381;
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while (key_str < end) {
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h += h << 5;
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h ^= (unsigned long) *key_str++;
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}
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return (h % slots_num);
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}
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size_t Curl_str_key_compare(void*k1, size_t key1_len, void*k2, size_t key2_len)
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{
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char *key1 = (char *)k1;
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char *key2 = (char *)k2;
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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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#if 0 /* useful function for debugging hashes and their contents */
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void Curl_hash_print(struct curl_hash *h,
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void (*func)(void *))
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{
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int i;
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struct curl_llist_element *le;
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struct curl_llist *list;
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struct curl_hash_element *he;
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if (!h)
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return;
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fprintf(stderr, "=Hash dump=\n");
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for (i = 0; i < h->slots; i++) {
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list = h->table[i];
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le = list->head; /* get first list entry */
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if(le) {
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fprintf(stderr, "index %d:", i);
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while(le) {
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he = le->ptr;
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if(func)
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func(he->ptr);
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else
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fprintf(stderr, " [%p]", he->ptr);
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le = le->next;
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}
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fprintf(stderr, "\n");
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}
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}
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}
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#endif
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