+ /**
+ * Rewinds to the beginning of the file
+ *
+ * @return void
+ */
+ function rewind ();
+
+ /**
+ * Seeks to given position
+ *
+ * @param $seekPosition Seek position in file
+ * @param $whence "Seek mode" (see http://de.php.net/fseek)
+ * @return void
+ */
+ function seek ($seekPosition, $whence = SEEK_SET);