convert ZPL DG into pbm image

diff --git a/ZPL2pbm.pl b/ZPL2pbm.pl
new file mode 100755 (executable)
index 0000000..89eead4
--- /dev/null
+++ b/ZPL2pbm.pl
@@ -0,0 +1,66 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+use autodie;
+
+my $file = shift @ARGV || die "usage: $0 dump.zpl";
+
+open(my $in, '<', $file);
+
+while(<$in>) {
+       chomp;
+       if ( /~DG(\w):(.+)/ ) {
+               my ( $name, $t,$w ) = split(/,/,$2,4);
+
+               warn "# $_ => [$name] t=$t w=$w\n";
+
+               my $data;
+               read $in, $data, $t;
+
+               my $out;
+               # ZPL decompress
+               my $repeat = 1;
+               foreach my $p ( 0 .. length($data) ) {
+                       my $c = substr($data,$p,1);
+                       if ( $c eq ',' ) {
+                               my $l = ( $w * 2 ) - length($out) % ( $w * 2 );
+                               $l = $w * 2 if $l == 0;
+                               warn "# $p ZERO-to-EOL $c [$l]\n";
+                               $out .= "0" x $l;
+                       } elsif ( $c eq ':' ) {
+                               $out .= length($out) > $w ? substr($out,-$w*2) : "00" x $w;
+                               warn "# $p :\n";
+                       } elsif ( $c eq 'z' ) {
+                               $repeat += 400;
+                       } elsif ( $c ge 'g' && $c le 'y' ) {
+                               $repeat += 20 * ( ord($c) - ord('f') );
+                       } elsif ( $c ge 'G' && $c le 'Y' ) {
+                               $repeat += ord($c) - ord('F');
+                       } elsif ( $c =~ m/[0-9A-F]/ ) {
+                               if ( $repeat ) {
+                                       warn "# $p $repeat $c\n";
+                                       $out .= $c x $repeat;
+                                       $repeat = 0;
+                               } else {
+                                       warn "# $p hex $c\n";
+                                       $out .= $c;
+                               }
+                       } else {
+                               warn "ABORT: offset $p data [$c]";
+                               last;
+                       }
+
+                       warn "## $repeat [$c] out = ",length($out);
+               }
+
+
+               my $bitmap = pack('H*', $out);
+               warn "# graphics of ",length($data)," bytes ZPL decompressed to ",length($out)," hex and ", length($bitmap), " bytes bitmap\n";
+               my $pw = $w * 8;
+               my $ph = int(length($bitmap) / $w);
+               print "P4\n$pw $ph\n", substr($bitmap,0,$ph*$w);
+
+       } else {
+               warn "IGNORED: $_\n";
+       }
+}