diff options
Diffstat (limited to 'polyp/hashmap.c')
-rw-r--r-- | polyp/hashmap.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/polyp/hashmap.c b/polyp/hashmap.c deleted file mode 100644 index a37decb8..00000000 --- a/polyp/hashmap.c +++ /dev/null @@ -1,194 +0,0 @@ -/* $Id$ */ - -/*** - 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; -} |