hashtable: Add destroy_function method

src/libstrongswan/collections/hashtable.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008-2012 Tobias Brunner
+ * Copyright (C) 2008-2014 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -427,8 +427,8 @@ METHOD(hashtable_t, create_enumerator, enumerator_t*,
 	return &enumerator->enumerator;
 }
 
-METHOD(hashtable_t, destroy, void,
+static void destroy_internal(private_hashtable_t *this,
-	   private_hashtable_t *this)
+							 void (*fn)(void*,const void*))
 {
 	pair_t *pair, *next;
 	u_int row;
@@ -438,6 +438,10 @@ METHOD(hashtable_t, destroy, void,
 		pair = this->table[row];
 		while (pair)
 		{
+			if (fn)
+			{
+				fn(pair->value, pair->key);
+			}
 			next = pair->next;
 			free(pair);
 			pair = next;
@@ -447,6 +451,18 @@ METHOD(hashtable_t, destroy, void,
 	free(this);
 }
 
+METHOD(hashtable_t, destroy, void,
+	private_hashtable_t *this)
+{
+	destroy_internal(this, NULL);
+}
+
+METHOD(hashtable_t, destroy_function, void,
+	private_hashtable_t *this, void (*fn)(void*,const void*))
+{
+	destroy_internal(this, fn);
+}
+
 /*
  * Described in header.
  */
@@ -465,6 +481,7 @@ hashtable_t *hashtable_create(hashtable_hash_t hash, hashtable_equals_t equals,
 			.get_count = _get_count,
 			.create_enumerator = _create_enumerator,
 			.destroy = _destroy,
+			.destroy_function = _destroy_function,
 		},
 		.hash = hash,
 		.equals = equals,

src/libstrongswan/collections/hashtable.h

@@ -156,6 +156,15 @@ struct hashtable_t {
 	 * Destroys a hash table object.
 	 */
 	void (*destroy) (hashtable_t *this);
+
+	/**
+	 * Destroys a hash table object and calls the given function for each
+	 * item and its key in the hash table.
+	 *
+	 * @param function	function to call on each item and key
+	 */
+	void (*destroy_function)(hashtable_t *this,
+							 void (*)(void *val, const void *key));
 };
 
 /**