Archive_Tar::_openReadWrite PHP Method

    function _openReadWrite()
    {
        if ($this->_compress_type == 'gz') {
            $this->_file = @gzopen($this->_tarname, "r+b");
        } else {
            if ($this->_compress_type == 'bz2') {
                $this->_error('Unable to open bz2 in read/write mode \'' . $this->_tarname . '\' (limitation of bz2 extension)');
                return false;
            } else {
                if ($this->_compress_type == 'none') {
                    $this->_file = @fopen($this->_tarname, "r+b");
                } else {
                    $this->_error('Unknown or missing compression type (' . $this->_compress_type . ')');
                }
            }
        }
        if ($this->_file == 0) {
            $this->_error('Unable to open in read/write mode \'' . $this->_tarname . '\'');
            return false;
        }
        return true;
    }