- introduced FindHdbCallbackData

hipadaba.h

@@ -284,6 +284,15 @@ void RemoveHipadabaCallback(pHdb root, int id);
  * @param internalID The internal ID callbacks have to match in order to be removed.
  */
 void InternalRemoveHipadabaCallback(pHdb root, void *internalID);
+/**
+ * find the callback data
+ * @param node the node from where callbacks have to be searched
+ * @param type the type of the callback to be searched
+ * @param func the function registered with the searched callback 
+ * @return the found callback user data or NULL on failure
+ */
+void *FindHdbCallbackData(pHdb node, int type, hdbCallbackFunction func
+                         , void *internalID);
 /**
  * invoke a callback chain.
  * @param root The callback chain to invoke