lib/magento/Archive/Tar.php
protected function _setCurrentFile($file)
    {
        $this->_currentFile = $file .((!is_link($file) && is_dir($file) && substr($file, -1) != DS) ? DS : '');
        return $this;
    }
protected function _setCurrentFile($file)
    {
        $this->_currentFile = $file .((!is_link($file) && is_dir($file) && substr($file, -1) != DS) ? DS : '');
        return $this;
    }
protected function _setCurrentFile ( $ file ) { $ this -> _currentFile = $ file . ( ( ! is_link ( $ file ) && is_dir ( $ file ) && substr ( $ file , - 1 ) != DS ) ? DS : '' ) ; return $ this ; }
Set file which is packing.

@param string $file
@return Mage_Archive_Tar
Set file which is packing .