Add support for manually freeing repo objects

A new method 'git_repository_object_free' allows to manually force the
freeing of a repository object, even though they are still automatically
managed by the repository and don't need to be freed by the user.

Signed-off-by: Vicent Marti <tanoku@gmail.com>

src/git/repository.h

@@ -49,6 +49,21 @@ GIT_EXTERN(git_repository *) git_repository_alloc(git_odb *odb);
  */
 GIT_EXTERN(git_repository_object *) git_repository_lookup(git_repository *repo, const git_oid *id, git_otype type);
 
+
+/**
+ * Free a reference to one of the objects in the repostory.
+ *
+ * Repository objects are managed automatically by the library,
+ * but this method can be used to force freeing one of the
+ * objects.
+ *
+ * Careful: freeing objects in the middle of a repository
+ * traversal will most likely cause errors.
+ *
+ * @param object the object to free
+ */
+GIT_EXTERN(void) git_repository_object_free(git_repository_object *object);
+
 /**
  * Free a previously allocated repository
  * @param repo repository handle to close. If NULL nothing occurs.

src/hashtable.c

@@ -183,6 +183,37 @@ void *git_hashtable_lookup(git_hashtable *table, const void *key)
 	return NULL;
 }
 
+int git_hashtable_remove(git_hashtable *table, const void *key)
+{
+	git_hashtable_node *node, *prev_node;
+	uint32_t index, hash;
+
+	assert(table);
+
+	hash = table->hash(key);
+	index = (hash & table->size_mask);
+	node = table->nodes[index];
+
+	prev_node = NULL;
+
+	while (node != NULL) {
+		if (node->hash == hash && table->key_equal(node->object, key)) {
+			if (prev_node == NULL)
+				table->nodes[index] = node->next;
+			else
+				prev_node->next = node->next;
+
+			free(node);
+			return GIT_SUCCESS;
+		}
+
+		prev_node = node;
+		node = node->next;
+	}
+
+	return GIT_ENOTFOUND;
+}
+
 
 
 void git_hashtable_iterator_init(git_hashtable *table, git_hashtable_iterator *it)

src/hashtable.h

@@ -42,6 +42,7 @@ git_hashtable *git_hashtable_alloc(unsigned int min_size,
 		git_hash_keyeq_ptr key_eq);
 int git_hashtable_insert(git_hashtable *h, const void *key, void *value);
 void *git_hashtable_lookup(git_hashtable *h, const void *key);
+int git_hashtable_remove(git_hashtable *table, const void *key);
 void git_hashtable_free(git_hashtable *h);
 void git_hashtable_clear(git_hashtable *h);
 

src/repository.c

@@ -83,28 +83,8 @@ void git_repository_free(git_repository *repo)
 	git_hashtable_iterator_init(repo->objects, &it);
 
 	while ((object = (git_repository_object *)
-				git_hashtable_iterator_next(&it)) != NULL) {
-
-		git_obj_close(&object->dbo);
-	
-		switch (object->dbo.type) {
-		case GIT_OBJ_COMMIT:
-			git_commit__free((git_commit *)object);
-			break;
-
-		case GIT_OBJ_TREE:
-			git_tree__free((git_tree *)object);
-			break;
-
-		case GIT_OBJ_TAG:
-			git_tag__free((git_tag *)object);
-			break;
-
-		default:
-			free(object);
-			break;
-		}
-	}
+				git_hashtable_iterator_next(&it)) != NULL)
+		git_repository_object_free(object);
 
 	git_hashtable_free(repo->objects);
 	/* TODO: free odb */
@@ -134,6 +114,30 @@ void git_repository__close_dbo(git_repository_object *object)
 	}
 }
 
+void git_repository_object_free(git_repository_object *object)
+{
+	git_hashtable_remove(object->repo->objects, &object->id);
+	git_obj_close(&object->dbo);
+
+	switch (object->dbo.type) {
+	case GIT_OBJ_COMMIT:
+		git_commit__free((git_commit *)object);
+		break;
+
+	case GIT_OBJ_TREE:
+		git_tree__free((git_tree *)object);
+		break;
+
+	case GIT_OBJ_TAG:
+		git_tag__free((git_tag *)object);
+		break;
+
+	default:
+		free(object);
+		break;
+	}
+}
+
 git_repository_object *git_repository_lookup(git_repository *repo, const git_oid *id, git_otype type)
 {
 	static const size_t object_sizes[] = {