public static function decompressFile($file, $destination = NULL)
 {
     if (!is_file($file)) {
         throw new Exception("{$file} is not a regular file");
     }
     $parser = new self(new ApkStream(fopen($file, 'rd')));
     //TODO : write a method in this class, ->saveToFile();
     file_put_contents($destination === NULL ? $file : $destination, $parser->getXmlString());
 }