syslinux2ansi.pl

   1 #!/usr/bin/perl
   2 #
   3 # Perl script to convert a Syslinux-format screen to PC-ANSI
   4 # to display in a color xterm or on the Linux console
   5 #
   6
   7 @ansicol = (0,4,2,6,1,5,3,7);
   8
   9 $getting_file = 0;
  10 $enable = 1;
  11
  12 while ( read(STDIN, $ch, 1) > 0 ) {
  13     if ( $ch eq "\x1A" ) {      # <SUB> <Ctrl-Z> EOF
  14         last;
  15     } elsif ( $ch eq "\x0C" ) { # <FF>  <Ctrl-L> Clear screen
  16         print "\x1b[2J" if ( $enable && !$getting_file );
  17     } elsif ( $ch eq "\x0F" ) { # <SI>  <Ctrl-O> Attribute change
  18         if ( !$getting_file ) {
  19             if ( read(STDIN, $attr, 2) == 2 ) {
  20                 $attr = hex $attr;
  21                 if ( $enable ) {
  22                     print "\x1b[0;";
  23                     if ( $attr & 0x80 ) {
  24                         print "5;";
  25                         $attr &= ~0x80;
  26                     }
  27                     if ( $attr & 0x08 ) {
  28                         print "1;";
  29                         $attr &= ~0x08;
  30                     }
  31                     printf "%d;%dm",
  32                     $ansicol[$attr >> 4] + 40, $ansicol[$attr & 7] + 30;
  33                 }
  34             }
  35         }
  36     } elsif ( $ch eq "\x18" ) { # <CAN> <Ctrl-X> Display image
  37         # We can't display an image; pretend to be a text screen
  38         # Ignore all input until end of line
  39         $getting_file = 1;
  40     } elsif ( (ord($ch) & ~07) == 0x10 ) { # Mode controls
  41         $enable = (ord($ch) & 0x01); # Emulate the text screen
  42     } elsif ( $ch eq "\x0D" ) { # <CR>  <Ctrl-M> Carriage return
  43         # Ignore
  44     } elsif ( $ch eq "\x0A" ) { # <LF>  <Ctrl-J> Line feed
  45         if ( $getting_file ) {
  46             $getting_file = 0;
  47         } else {
  48             print $ch if ( $enable );
  49         }
  50     } else {
  51         print $ch if ( $enable && !$getting_file );
  52     }
  53 }