summaryrefslogtreecommitdiffstats
path: root/src/pulsecore/hashmap.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/pulsecore/hashmap.c')
-rw-r--r--src/pulsecore/hashmap.c342
1 files changed, 342 insertions, 0 deletions
diff --git a/src/pulsecore/hashmap.c b/src/pulsecore/hashmap.c
new file mode 100644
index 0000000..c2fc3f5
--- /dev/null
+++ b/src/pulsecore/hashmap.c
@@ -0,0 +1,342 @@
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2004-2008 Lennart Poettering
+
+ PulseAudio 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 2.1 of the License,
+ or (at your option) any later version.
+
+ PulseAudio 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 PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+
+#include <pulse/xmalloc.h>
+#include <pulsecore/idxset.h>
+#include <pulsecore/flist.h>
+#include <pulsecore/macro.h>
+
+#include "hashmap.h"
+
+#define NBUCKETS 127
+
+struct hashmap_entry {
+ void *key;
+ void *value;
+
+ struct hashmap_entry *bucket_next, *bucket_previous;
+ struct hashmap_entry *iterate_next, *iterate_previous;
+};
+
+struct pa_hashmap {
+ pa_hash_func_t hash_func;
+ pa_compare_func_t compare_func;
+
+ pa_free_cb_t key_free_func;
+ pa_free_cb_t value_free_func;
+
+ struct hashmap_entry *iterate_list_head, *iterate_list_tail;
+ unsigned n_entries;
+};
+
+#define BY_HASH(h) ((struct hashmap_entry**) ((uint8_t*) (h) + PA_ALIGN(sizeof(pa_hashmap))))
+
+PA_STATIC_FLIST_DECLARE(entries, 0, pa_xfree);
+
+pa_hashmap *pa_hashmap_new_full(pa_hash_func_t hash_func, pa_compare_func_t compare_func, pa_free_cb_t key_free_func, pa_free_cb_t value_free_func) {
+ pa_hashmap *h;
+
+ h = pa_xmalloc0(PA_ALIGN(sizeof(pa_hashmap)) + NBUCKETS*sizeof(struct hashmap_entry*));
+
+ h->hash_func = hash_func ? hash_func : pa_idxset_trivial_hash_func;
+ h->compare_func = compare_func ? compare_func : pa_idxset_trivial_compare_func;
+
+ h->key_free_func = key_free_func;
+ h->value_free_func = value_free_func;
+
+ h->n_entries = 0;
+ h->iterate_list_head = h->iterate_list_tail = NULL;
+
+ return h;
+}
+
+pa_hashmap *pa_hashmap_new(pa_hash_func_t hash_func, pa_compare_func_t compare_func) {
+ return pa_hashmap_new_full(hash_func, compare_func, NULL, NULL);
+}
+
+static void remove_entry(pa_hashmap *h, struct hashmap_entry *e) {
+ pa_assert(h);
+ pa_assert(e);
+
+ /* Remove from iteration list */
+ if (e->iterate_next)
+ e->iterate_next->iterate_previous = e->iterate_previous;
+ else
+ h->iterate_list_tail = e->iterate_previous;
+
+ if (e->iterate_previous)
+ e->iterate_previous->iterate_next = e->iterate_next;
+ else
+ h->iterate_list_head = e->iterate_next;
+
+ /* Remove from hash table bucket list */
+ 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 {
+ unsigned hash = h->hash_func(e->key) % NBUCKETS;
+ BY_HASH(h)[hash] = e->bucket_next;
+ }
+
+ if (h->key_free_func)
+ h->key_free_func(e->key);
+
+ if (pa_flist_push(PA_STATIC_FLIST_GET(entries), e) < 0)
+ pa_xfree(e);
+
+ pa_assert(h->n_entries >= 1);
+ h->n_entries--;
+}
+
+void pa_hashmap_free(pa_hashmap *h) {
+ pa_assert(h);
+
+ pa_hashmap_remove_all(h);
+ pa_xfree(h);
+}
+
+static struct hashmap_entry *hash_scan(const pa_hashmap *h, unsigned hash, const void *key) {
+ struct hashmap_entry *e;
+ pa_assert(h);
+ pa_assert(hash < NBUCKETS);
+
+ for (e = BY_HASH(h)[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, void *key, void *value) {
+ struct hashmap_entry *e;
+ unsigned hash;
+
+ pa_assert(h);
+
+ hash = h->hash_func(key) % NBUCKETS;
+
+ if (hash_scan(h, hash, key))
+ return -1;
+
+ if (!(e = pa_flist_pop(PA_STATIC_FLIST_GET(entries))))
+ e = pa_xnew(struct hashmap_entry, 1);
+
+ e->key = key;
+ e->value = value;
+
+ /* Insert into hash table */
+ e->bucket_next = BY_HASH(h)[hash];
+ e->bucket_previous = NULL;
+ if (BY_HASH(h)[hash])
+ BY_HASH(h)[hash]->bucket_previous = e;
+ BY_HASH(h)[hash] = e;
+
+ /* Insert into iteration list */
+ e->iterate_previous = h->iterate_list_tail;
+ e->iterate_next = NULL;
+ if (h->iterate_list_tail) {
+ pa_assert(h->iterate_list_head);
+ h->iterate_list_tail->iterate_next = e;
+ } else {
+ pa_assert(!h->iterate_list_head);
+ h->iterate_list_head = e;
+ }
+ h->iterate_list_tail = e;
+
+ h->n_entries++;
+ pa_assert(h->n_entries >= 1);
+
+ return 0;
+}
+
+void* pa_hashmap_get(const pa_hashmap *h, const void *key) {
+ unsigned hash;
+ struct hashmap_entry *e;
+
+ pa_assert(h);
+
+ hash = h->hash_func(key) % NBUCKETS;
+
+ if (!(e = hash_scan(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;
+
+ pa_assert(h);
+
+ hash = h->hash_func(key) % NBUCKETS;
+
+ if (!(e = hash_scan(h, hash, key)))
+ return NULL;
+
+ data = e->value;
+ remove_entry(h, e);
+
+ return data;
+}
+
+int pa_hashmap_remove_and_free(pa_hashmap *h, const void *key) {
+ void *data;
+
+ pa_assert(h);
+
+ data = pa_hashmap_remove(h, key);
+
+ if (data && h->value_free_func)
+ h->value_free_func(data);
+
+ return data ? 0 : -1;
+}
+
+void pa_hashmap_remove_all(pa_hashmap *h) {
+ pa_assert(h);
+
+ while (h->iterate_list_head) {
+ void *data;
+ data = h->iterate_list_head->value;
+ remove_entry(h, h->iterate_list_head);
+
+ if (h->value_free_func)
+ h->value_free_func(data);
+ }
+}
+
+void *pa_hashmap_iterate(const pa_hashmap *h, void **state, const void **key) {
+ struct hashmap_entry *e;
+
+ pa_assert(h);
+ pa_assert(state);
+
+ if (*state == (void*) -1)
+ goto at_end;
+
+ if (!*state && !h->iterate_list_head)
+ goto at_end;
+
+ e = *state ? *state : h->iterate_list_head;
+
+ if (e->iterate_next)
+ *state = e->iterate_next;
+ else
+ *state = (void*) -1;
+
+ if (key)
+ *key = e->key;
+
+ return e->value;
+
+at_end:
+ *state = (void *) -1;
+
+ if (key)
+ *key = NULL;
+
+ return NULL;
+}
+
+void *pa_hashmap_iterate_backwards(const pa_hashmap *h, void **state, const void **key) {
+ struct hashmap_entry *e;
+
+ pa_assert(h);
+ pa_assert(state);
+
+ if (*state == (void*) -1)
+ goto at_beginning;
+
+ if (!*state && !h->iterate_list_tail)
+ goto at_beginning;
+
+ e = *state ? *state : h->iterate_list_tail;
+
+ if (e->iterate_previous)
+ *state = e->iterate_previous;
+ else
+ *state = (void*) -1;
+
+ if (key)
+ *key = e->key;
+
+ return e->value;
+
+at_beginning:
+ *state = (void *) -1;
+
+ if (key)
+ *key = NULL;
+
+ return NULL;
+}
+
+void* pa_hashmap_first(const pa_hashmap *h) {
+ pa_assert(h);
+
+ if (!h->iterate_list_head)
+ return NULL;
+
+ return h->iterate_list_head->value;
+}
+
+void* pa_hashmap_last(const pa_hashmap *h) {
+ pa_assert(h);
+
+ if (!h->iterate_list_tail)
+ return NULL;
+
+ return h->iterate_list_tail->value;
+}
+
+void* pa_hashmap_steal_first(pa_hashmap *h) {
+ void *data;
+
+ pa_assert(h);
+
+ if (!h->iterate_list_head)
+ return NULL;
+
+ data = h->iterate_list_head->value;
+ remove_entry(h, h->iterate_list_head);
+
+ return data;
+}
+
+unsigned pa_hashmap_size(const pa_hashmap *h) {
+ pa_assert(h);
+
+ return h->n_entries;
+}
+
+bool pa_hashmap_isempty(const pa_hashmap *h) {
+ pa_assert(h);
+
+ return h->n_entries == 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 12:36:50 +0000