X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=src%2Fhashmap.c;fp=src%2Fhashmap.c;h=32f2510d7b31a519f27379323f243a8ebca56819;hb=f1de9dcaab953757252d51b4725cbfa36daa10a5;hp=0000000000000000000000000000000000000000;hpb=7a5b2f69af7d36d6cd4153142f125fa011784e03;p=catta

diff --git a/src/hashmap.c b/src/hashmap.c
new file mode 100644
index 0000000..32f2510
--- /dev/null
+++ b/src/hashmap.c
@@ -0,0 +1,248 @@
+/***
+  This file is part of catta.
+
+  catta 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.
+
+  catta 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 Lesser General
+  Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with catta; 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 <string.h>
+
+#include <catta/llist.h>
+#include <catta/domain.h>
+#include <catta/malloc.h>
+
+#include "hashmap.h"
+#include "util.h"
+
+#define HASH_MAP_SIZE 123
+
+typedef struct Entry Entry;
+struct Entry {
+    CattaHashmap *hashmap;
+    void *key;
+    void *value;
+
+    CATTA_LLIST_FIELDS(Entry, bucket);
+    CATTA_LLIST_FIELDS(Entry, entries);
+};
+
+struct CattaHashmap {
+    CattaHashFunc hash_func;
+    CattaEqualFunc equal_func;
+    CattaFreeFunc key_free_func, value_free_func;
+
+    Entry *entries[HASH_MAP_SIZE];
+    CATTA_LLIST_HEAD(Entry, entries_list);
+};
+
+static Entry* entry_get(CattaHashmap *m, const void *key) {
+    unsigned idx;
+    Entry *e;
+
+    idx = m->hash_func(key) % HASH_MAP_SIZE;
+
+    for (e = m->entries[idx]; e; e = e->bucket_next)
+        if (m->equal_func(key, e->key))
+            return e;
+
+    return NULL;
+}
+
+static void entry_free(CattaHashmap *m, Entry *e, int stolen) {
+    unsigned idx;
+    assert(m);
+    assert(e);
+
+    idx = m->hash_func(e->key) % HASH_MAP_SIZE;
+
+    CATTA_LLIST_REMOVE(Entry, bucket, m->entries[idx], e);
+    CATTA_LLIST_REMOVE(Entry, entries, m->entries_list, e);
+
+    if (m->key_free_func)
+        m->key_free_func(e->key);
+    if (m->value_free_func && !stolen)
+        m->value_free_func(e->value);
+
+    catta_free(e);
+}
+
+CattaHashmap* catta_hashmap_new(CattaHashFunc hash_func, CattaEqualFunc equal_func, CattaFreeFunc key_free_func, CattaFreeFunc value_free_func) {
+    CattaHashmap *m;
+
+    assert(hash_func);
+    assert(equal_func);
+
+    if (!(m = catta_new0(CattaHashmap, 1)))
+        return NULL;
+
+    m->hash_func = hash_func;
+    m->equal_func = equal_func;
+    m->key_free_func = key_free_func;
+    m->value_free_func = value_free_func;
+
+    CATTA_LLIST_HEAD_INIT(Entry, m->entries_list);
+
+    return m;
+}
+
+void catta_hashmap_free(CattaHashmap *m) {
+    assert(m);
+
+    while (m->entries_list)
+        entry_free(m, m->entries_list, 0);
+
+    catta_free(m);
+}
+
+void* catta_hashmap_lookup(CattaHashmap *m, const void *key) {
+    Entry *e;
+
+    assert(m);
+
+    if (!(e = entry_get(m, key)))
+        return NULL;
+
+    return e->value;
+}
+
+int catta_hashmap_insert(CattaHashmap *m, void *key, void *value) {
+    unsigned idx;
+    Entry *e;
+
+    assert(m);
+
+    if ((e = entry_get(m, key))) {
+        if (m->key_free_func)
+            m->key_free_func(key);
+        if (m->value_free_func)
+            m->value_free_func(value);
+
+        return 1;
+    }
+
+    if (!(e = catta_new(Entry, 1)))
+        return -1;
+
+    e->hashmap = m;
+    e->key = key;
+    e->value = value;
+
+    CATTA_LLIST_PREPEND(Entry, entries, m->entries_list, e);
+
+    idx = m->hash_func(key) % HASH_MAP_SIZE;
+    CATTA_LLIST_PREPEND(Entry, bucket, m->entries[idx], e);
+
+    return 0;
+}
+
+
+int catta_hashmap_replace(CattaHashmap *m, void *key, void *value) {
+    unsigned idx;
+    Entry *e;
+
+    assert(m);
+
+    if ((e = entry_get(m, key))) {
+        if (m->key_free_func)
+            m->key_free_func(e->key);
+        if (m->value_free_func)
+            m->value_free_func(e->value);
+
+        e->key = key;
+        e->value = value;
+
+        return 1;
+    }
+
+    if (!(e = catta_new(Entry, 1)))
+        return -1;
+
+    e->hashmap = m;
+    e->key = key;
+    e->value = value;
+
+    CATTA_LLIST_PREPEND(Entry, entries, m->entries_list, e);
+
+    idx = m->hash_func(key) % HASH_MAP_SIZE;
+    CATTA_LLIST_PREPEND(Entry, bucket, m->entries[idx], e);
+
+    return 0;
+}
+
+void catta_hashmap_remove(CattaHashmap *m, const void *key) {
+    Entry *e;
+
+    assert(m);
+
+    if (!(e = entry_get(m, key)))
+        return;
+
+    entry_free(m, e, 0);
+}
+
+void catta_hashmap_foreach(CattaHashmap *m, CattaHashmapForeachCallback callback, void *userdata) {
+    Entry *e, *next;
+    assert(m);
+    assert(callback);
+
+    for (e = m->entries_list; e; e = next) {
+        next = e->entries_next;
+
+        callback(e->key, e->value, userdata);
+    }
+}
+
+unsigned catta_string_hash(const void *data) {
+    const char *p = data;
+    unsigned hash = 0;
+
+    assert(p);
+
+    for (; *p; p++)
+        hash = 31 * hash + *p;
+
+    return hash;
+}
+
+int catta_string_equal(const void *a, const void *b) {
+    const char *p = a, *q = b;
+
+    assert(p);
+    assert(q);
+
+    return strcmp(p, q) == 0;
+}
+
+unsigned catta_int_hash(const void *data) {
+    const int *i = data;
+
+    assert(i);
+
+    return (unsigned) *i;
+}
+
+int catta_int_equal(const void *a, const void *b) {
+    const int *_a = a, *_b = b;
+
+    assert(_a);
+    assert(_b);
+
+    return *_a == *_b;
+}