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/*
* (C) 2006-2009 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Description: generic hash table implementation
*/
#include "hash.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
struct hashtable *
hashtable_create(int hashsize, int limit,
uint32_t (*hash)(const void *data,
const struct hashtable *table),
int (*compare)(const void *data1, const void *data2))
{
int i;
struct hashtable *h;
int size = sizeof(struct hashtable)
+ hashsize * sizeof(struct list_head);
h = (struct hashtable *) calloc(size, 1);
if (h == NULL) {
errno = ENOMEM;
return NULL;
}
for (i=0; i<hashsize; i++)
INIT_LIST_HEAD(&h->members[i]);
h->hashsize = hashsize;
h->limit = limit;
h->hash = hash;
h->compare = compare;
return h;
}
void hashtable_destroy(struct hashtable *h)
{
free(h);
}
int hashtable_hash(const struct hashtable *table, const void *data)
{
return table->hash(data, table);
}
struct hashtable_node *
hashtable_find(const struct hashtable *table, const void *data, int id)
{
struct list_head *e;
struct hashtable_node *n;
list_for_each(e, &table->members[id]) {
n = list_entry(e, struct hashtable_node, head);
if (table->compare(n, data)) {
return n;
}
}
errno = ENOENT;
return NULL;
}
int hashtable_add(struct hashtable *table, struct hashtable_node *n, int id)
{
/* hash table is full */
if (table->count >= table->limit) {
errno = ENOSPC;
return -1;
}
list_add(&n->head, &table->members[id]);
table->count++;
return 0;
}
void hashtable_del(struct hashtable *table, struct hashtable_node *n)
{
list_del(&n->head);
table->count--;
}
int hashtable_flush(struct hashtable *table)
{
uint32_t i;
struct list_head *e, *tmp;
struct hashtable_node *n;
for (i=0; i < table->hashsize; i++) {
list_for_each_safe(e, tmp, &table->members[i]) {
n = list_entry(e, struct hashtable_node, head);
free(n);
}
}
return 0;
}
int hashtable_iterate(struct hashtable *table, void *data,
int (*iterate)(void *data1, struct hashtable_node *n))
{
uint32_t i;
struct list_head *e, *tmp;
struct hashtable_node *n;
for (i=0; i < table->hashsize; i++) {
list_for_each_safe(e, tmp, &table->members[i]) {
n = list_entry(e, struct hashtable_node, head);
if (iterate(data, n) == -1)
return -1;
}
}
return 0;
}
unsigned int hashtable_counter(const struct hashtable *table)
{
return table->count;
}
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