hashtable: add common hashtable hash/equals functions for pointer/string keys

src/libstrongswan/collections/hashtable.c

@@ -16,6 +16,8 @@
 
 #include "hashtable.h"
 
+#include <utils/chunk.h>
+
 /** The maximum capacity of the hash table (MUST be a power of 2) */
 #define MAX_CAPACITY (1 << 30)
 
@@ -146,9 +148,40 @@ struct private_enumerator_t {
 	 * previous pair (used by remove_at)
 	 */
 	pair_t *prev;
-
 };
 
+/*
+ * See header.
+ */
+u_int hashtable_hash_ptr(void *key)
+{
+	return chunk_hash(chunk_from_thing(key));
+}
+
+/*
+ * See header.
+ */
+u_int hashtable_hash_str(void *key)
+{
+	return chunk_hash(chunk_from_str((char*)key));
+}
+
+/*
+ * See header.
+ */
+bool hashtable_equals_ptr(void *key, void *other_key)
+{
+	return key == other_key;
+}
+
+/*
+ * See header.
+ */
+bool hashtable_equals_str(void *key, void *other_key)
+{
+	return streq(key, other_key);
+}
+
 /**
  * This function returns the next-highest power of two for the given number.
  * The algorithm works by setting all bits on the right-hand side of the most
@@ -441,4 +474,3 @@ hashtable_t *hashtable_create(hashtable_hash_t hash, hashtable_equals_t equals,
 
 	return &this->public;
 }
-

src/libstrongswan/collections/hashtable.h

@@ -33,6 +33,22 @@ typedef struct hashtable_t hashtable_t;
  */
 typedef u_int (*hashtable_hash_t)(void *key);
 
+/**
+ * Hashtable hash function calculation the hash solely based on the key pointer.
+ *
+ * @param key			key to hash
+ * @return				hash of key
+ */
+u_int hashtable_hash_ptr(void *key);
+
+/**
+ * Hashtable hash function calculation the hash for char* keys.
+ *
+ * @param key			key to hash, a char*
+ * @return				hash of key
+ */
+u_int hashtable_hash_str(void *key);
+
 /**
  * Prototype for a function that compares the two keys for equality.
  *
@@ -42,6 +58,24 @@ typedef u_int (*hashtable_hash_t)(void *key);
  */
 typedef bool (*hashtable_equals_t)(void *key, void *other_key);
 
+/**
+ * Hashtable equals function comparing pointers.
+ *
+ * @param key			key to compare
+ * @param other_key		other key to compare
+ * @return				TRUE if key == other_key
+ */
+bool hashtable_equals_ptr(void *key, void *other_key);
+
+/**
+ * Hashtable equals function comparing char* keys.
+ *
+ * @param key			key to compare
+ * @param other_key		other key to compare
+ * @return				TRUE if streq(key, other_key)
+ */
+bool hashtable_equals_str(void *key, void *other_key);
+
 /**
  * Class implementing a hash table.
  *
@@ -121,7 +155,6 @@ struct hashtable_t {
 	 * Destroys a hash table object.
 	 */
 	void (*destroy) (hashtable_t *this);
-
 };
 
 /**