/**
  * Returns either the name if an id is given or the id if a name is given.
  * @param $mixed
  * @param int $options
  * @return int index , name or FALSE @params mixed, mixed (FL_NODIR, FL_NOCASE)
  */
 function find($mixed, $options = 0)
 {
     if (is_string($mixed)) {
         return $this->zip->locatename($mixed, $options);
     } else {
         return $this->zip->getNameIndex($mixed);
     }
 }