#!/usr/bin/perl## $Id$## -----------------------------------------------------------------------##   ##   Copyright 2001-2004 H. Peter Anvin - All Rights Reserved####   This program is free software; you can redistribute it and/or modify##   it under the terms of the GNU General Public License as published by##   the Free Software Foundation, Inc., 53 Temple Place Ste 330,##   Boston MA 02111-1307, USA; either version 2 of the License, or##   (at your option) any later version; incorporated herein by reference.#### -----------------------------------------------------------------------#### lss16toppm:## Convert an LSS-16 image to PPM#### Usage:####	lss16toppm [-map] < file.lss > file.ppm#### The -map causes the color map to be output on stderr.##eval { use bytes; };eval { binmode STDIN; };eval { binmode STDOUT; };$map = 0;foreach $arg ( @ARGV ) {    if ( $arg eq '-map' ) {	$map = 1;    } else {	print STDERR "$0: Unknown option: $arg\n";	exit 127;    }}if ( read(STDIN, $header, 56) != 56 ) {    print STDERR "$0: Short file\n";    exit 1;}($magic, $xsize, $ysize, @colorset) = unpack("Vvvc48", $header);if ( $magic != 0x1413f33d ) {    print STDERR "$0: Invalid file format\n";    exit 1;}%color = ();for ( $i = 0 ; $i < 16 ; $i++ ) {    $r = int((shift @colorset) * 255 / 63 + 0.5);    $g = int((shift @colorset) * 255 / 63 + 0.5);    $b = int((shift @colorset) * 255 / 63 + 0.5);    $color{$i} = pack("ccc", $r, $g, $b);    if ( $map ) {	printf STDERR "#%02x%02x%02x=%d\n", $r, $g, $b, $i;    }}sub get_nybble() {    my($ch,$n);    if ( defined($nybble_buf) ) {	$n = $nybble_buf;	undef $nybble_buf;    } else {	if ( read(STDIN, $ch, 1) != 1 ) {	    print STDERR "$0: Short read on input (file corrupt)\n";	    exit 1;	}	$ch = ord($ch);	$nybble_buf = $ch >> 4;	$n = $ch & 0xF;    }    return $n;}print "P6\n";print "$xsize $ysize\n";print "255\n";for ( $y = 0 ; $y < $ysize ; $y++ ) {    $x = 0;    $last = 0;    undef $nybble_buf;		# Nybble buffer starts clear on each line    while ( $x < $xsize ) {	$n = get_nybble();	if ( $n != $last ) {	    print $color{$n};	    $last = $n;	    $x++;	} else {	    $c = get_nybble();	    if ( $c == 0 ) {		# Double-nybble run		$c = get_nybble();		$c += get_nybble() << 4;		$c += 16;	    }	    # Truncate overlong runs	    $c = $xsize-$x if ( $c > $xsize-$x );	    # Output run	    print $color{$n} x $c;	    $x += $c;	}    }}