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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
polypaudio 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 Lesser General Public License
along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "hashmap.h"
#include "idxset.h"
#include "xmalloc.h"
#include "log.h"
#define BUCKETS 1023
struct hashmap_entry {
struct hashmap_entry *next, *previous, *bucket_next, *bucket_previous;
unsigned hash;
const void *key;
void *value;
};
struct pa_hashmap {
unsigned size;
struct hashmap_entry **data;
struct hashmap_entry *first_entry;
unsigned n_entries;
unsigned (*hash_func) (const void *p);
int (*compare_func) (const void*a, const void*b);
};
pa_hashmap *pa_hashmap_new(unsigned (*hash_func) (const void *p), int (*compare_func) (const void*a, const void*b)) {
pa_hashmap *h;
h = pa_xmalloc(sizeof(pa_hashmap));
h->data = pa_xmalloc0(sizeof(struct hashmap_entry*)*(h->size = BUCKETS));
h->first_entry = NULL;
h->n_entries = 0;
h->hash_func = hash_func ? hash_func : pa_idxset_trivial_hash_func;
h->compare_func = compare_func ? compare_func : pa_idxset_trivial_compare_func;
return h;
}
static void remove(pa_hashmap *h, struct hashmap_entry *e) {
assert(e);
if (e->next)
e->next->previous = e->previous;
if (e->previous)
e->previous->next = e->next;
else
h->first_entry = e->next;
if (e->bucket_next)
e->bucket_next->bucket_previous = e->bucket_previous;
if (e->bucket_previous)
e->bucket_previous->bucket_next = e->bucket_next;
else {
assert(e->hash < h->size);
h->data[e->hash] = e->bucket_next;
}
pa_xfree(e);
h->n_entries--;
}
void pa_hashmap_free(pa_hashmap*h, void (*free_func)(void *p, void *userdata), void *userdata) {
assert(h);
while (h->first_entry) {
if (free_func)
free_func(h->first_entry->value, userdata);
remove(h, h->first_entry);
}
pa_xfree(h->data);
pa_xfree(h);
}
static struct hashmap_entry *get(pa_hashmap *h, unsigned hash, const void *key) {
struct hashmap_entry *e;
assert(h && hash < h->size);
for (e = h->data[hash]; e; e = e->bucket_next)
if (h->compare_func(e->key, key) == 0)
return e;
return NULL;
}
int pa_hashmap_put(pa_hashmap *h, const void *key, void *value) {
struct hashmap_entry *e;
unsigned hash;
assert(h);
hash = h->hash_func(key) % h->size;
if ((e = get(h, hash, key)))
return -1;
e = pa_xmalloc(sizeof(struct hashmap_entry));
e->hash = hash;
e->key = key;
e->value = value;
e->previous = NULL;
e->next = h->first_entry;
if (h->first_entry)
h->first_entry->previous = e;
h->first_entry = e;
e->bucket_previous = NULL;
e->bucket_next = h->data[hash];
if (h->data[hash])
h->data[hash]->bucket_previous = e;
h->data[hash] = e;
h->n_entries ++;
return 0;
}
void* pa_hashmap_get(pa_hashmap *h, const void *key) {
unsigned hash;
struct hashmap_entry *e;
assert(h && key);
hash = h->hash_func(key) % h->size;
if (!(e = get(h, hash, key)))
return NULL;
return e->value;
}
void* pa_hashmap_remove(pa_hashmap *h, const void *key) {
struct hashmap_entry *e;
unsigned hash;
void *data;
assert(h && key);
hash = h->hash_func(key) % h->size;
if (!(e = get(h, hash, key)))
return NULL;
data = e->value;
remove(h, e);
return data;
}
unsigned pa_hashmap_size(pa_hashmap *h) {
return h->n_entries;
}
void *pa_hashmap_iterate(pa_hashmap *h, void **state, const void **key) {
assert(h && state);
if (!*state)
*state = h->first_entry;
else
*state = ((struct hashmap_entry*) *state)->next;
if (!*state) {
if (key)
*key = NULL;
return NULL;
}
if (key)
*key = ((struct hashmap_entry*) *state)->key;
return ((struct hashmap_entry*) *state)->value;
}
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