warn about extra nulls

diff --git a/evolis-printer.pl b/evolis-printer.pl
index 024c466..d8fea20 100755 (executable)
--- a/evolis-printer.pl
+++ b/evolis-printer.pl
@@ -20,7 +20,8 @@ my $page = 1;
 sub save_pbm;
 
 while(<>) {
-       die "no escape at beginning",dump($_) unless s/^\x1B//;
+       die "no escape at beginning",dump($_) unless s/^(\x00*)\x1B//;
+       warn "WARNING: ", length($1), " extra nulls before ESC\n" if $1;
        chomp;
        my @a = split(/;/,$_);
        my $c = shift @a;
@@ -50,7 +51,7 @@ while(<>) {
                }
                $len == length $comp or warn "wrong length $len != ", length $comp;
 
-               my ( $w, $h ) = ( 646, 1081 );  # from driver
+               my $w = 648 / 2;
 
 =for non-working
 
@@ -73,7 +74,7 @@ while(<>) {
                my $path = "page-Dbc-$color-$page.pbm";
                $page++;
 
-               #$h = int( length($data) * 8 / $w );
+               my $h = int( $len / 128 );
                save_pbm $path, $w, $h, $data;
 
        } else {