126 ) {
                    $line[] = '.'; // <- unprintable
                }
                else {
                    $line[] = $params->escape($c); // <- printable
                }
                // wrap at cols, and print plain text
                if( ++$i === $cols ){
                    echo '  ', implode('', $line ), "\n";
                    $line = [];
                    $i = 0;
                    $r++;
                }
            }
            if( $line ){
                if( $r ){
                   echo str_repeat( '   ', $cols - $i );
                }
                echo '  ', implode('', $line ), "\n";
            }
            ?>