public function __construct(Gpf_Io_File $source, Gpf_Io_File $target)
 {
     parent::__construct($source, $target, 0777);
 }
 public function __construct(Gpf_Io_File $source, Gpf_Io_File $target)
 {
     parent::__construct($source, $target, 0777);
     $this->sourceOffset = strlen(rtrim($source->getFileName(), '/\\')) + 1;
 }