1 files changed, 127 insertions, 0 deletions
diff --git a/src/dict.c b/src/dict.c
new file mode 100644
index 0000000..a225081
--- /dev/null
+++ b/src/dict.c
@@ -0,0 +1,127 @@
+#include <string.h>
+
+#include <import/eb32tree.h>
+#include <import/ebistree.h>
+#include <haproxy/dict.h>
+#include <haproxy/thread.h>
+
+struct dict *new_dict(const char *name)
+{
+	struct dict *dict;
+
+	dict = malloc(sizeof *dict);
+	if (!dict)
+		return NULL;
+
+	dict->name     = name;
+	dict->values   = EB_ROOT_UNIQUE;
+	HA_RWLOCK_INIT(&dict->rwlock);
+
+	return dict;
+}
+
+/*
+ * Allocate a new dictionary entry with <s> as string value which is strdup()'ed.
+ * Returns the new allocated entry if succeeded, NULL if not.
+ */
+static struct dict_entry *new_dict_entry(char *s)
+{
+	struct dict_entry *de;
+
+	de = calloc(1, sizeof *de);
+	if (!de)
+		return NULL;
+
+	de->value.key = strdup(s);
+	if (!de->value.key)
+		goto err;
+
+	de->len = strlen(s);
+	de->refcount = 1;
+
+	return de;
+
+ err:
+	ha_free(&de->value.key);
+	de->len = 0;
+	free(de);
+	return NULL;
+}
+
+/*
+ * Release the memory allocated for <de> dictionary entry.
+ */
+static void free_dict_entry(struct dict_entry *de)
+{
+	de->refcount = 0;
+	ha_free(&de->value.key);
+	free(de);
+}
+
+/*
+ * Simple function to lookup dictionary entries with <s> as value.
+ */
+static struct dict_entry *__dict_lookup(struct dict *d, const char *s)
+{
+	struct dict_entry *de;
+	struct ebpt_node *node;
+
+	de = NULL;
+	node = ebis_lookup(&d->values, s);
+	if (node)
+		de = container_of(node, struct dict_entry, value);
+
+	return de;
+}
+
+/*
+ * Insert an entry in <d> dictionary with <s> as value. *
+ */
+struct dict_entry *dict_insert(struct dict *d, char *s)
+{
+	struct dict_entry *de;
+	struct ebpt_node *n;
+
+	HA_RWLOCK_RDLOCK(DICT_LOCK, &d->rwlock);
+	de = __dict_lookup(d, s);
+	HA_RWLOCK_RDUNLOCK(DICT_LOCK, &d->rwlock);
+	if (de) {
+		HA_ATOMIC_INC(&de->refcount);
+		return de;
+	}
+
+	de = new_dict_entry(s);
+	if (!de)
+		return NULL;
+
+	HA_RWLOCK_WRLOCK(DICT_LOCK, &d->rwlock);
+	n = ebis_insert(&d->values, &de->value);
+	HA_RWLOCK_WRUNLOCK(DICT_LOCK, &d->rwlock);
+	if (n != &de->value) {
+		free_dict_entry(de);
+		de = container_of(n, struct dict_entry, value);
+	}
+
+	return de;
+}
+
+
+/*
+ * Unreference a dict entry previously acquired with <dict_insert>.
+ * If this is the last live reference to the entry, it is
+ * removed from the dictionary.
+ */
+void dict_entry_unref(struct dict *d, struct dict_entry *de)
+{
+	if (!de)
+		return;
+
+	if (HA_ATOMIC_SUB_FETCH(&de->refcount, 1) != 0)
+		return;
+
+	HA_RWLOCK_WRLOCK(DICT_LOCK, &d->rwlock);
+	ebpt_delete(&de->value);
+	HA_RWLOCK_WRUNLOCK(DICT_LOCK, &d->rwlock);
+
+	free_dict_entry(de);
+}