lib/magento/Archive/Tar.php
protected function _initReader()
    {
        $this->_reader = new Mage_Archive_Helper_File($this->_getCurrentFile());
        $this->_reader->open('r');

        return $this;
    }
protected function _initReader()
    {
        $this->_reader = new Mage_Archive_Helper_File($this->_getCurrentFile());
        $this->_reader->open('r');

        return $this;
    }
protected function _initReader ( ) { $ this -> _reader = new Mage_Archive_Helper_File ( $ this -> _getCurrentFile ( ) ) ; $ this -> _reader -> open ( 'r' ) ; return $ this ; }
Initialize tarball reader

@return Mage_Archive_Tar
Initialize tarball reader