tools/gif2xface.pl

   1 #!/usr/bin/perl
   2 #
   3 # gif2xface -- converts a 48x48 GIF file to an X-Face mail header
   4 #
   5 # Author:  Ricardo Mones <ricardo@mones.org>
   6 #
   7 #   This is a hack over the original xbm2face script. The xbm files generated
   8 #   by some graphic tools (notably The Gimp version 1.2.1) aren't suitable to
   9 #   feed the compface program. Starting with a GIF and using some filters does
  10 #   the trick. A little help screen also added.
  11 #   This requieres giftopnm and pbmtoxbm (both in libgr-progs package).
  12 #
  13 #   The original xbm2face author's comment follows:
  14 #
  15 # xbm2xface -- converts a 48x48 xbm file to an X-Face mail header
  16 #
  17 # Author:  Jonathan Stigelman <Stig@hackvan.com>
  18 #
  19 # URL:     http://hackvan.com/pub/stig/src/linux/
  20 # FTP:     hackvan.com:/pub/stig/src/linux/
  21 #
  22 #   This is a Perl script that I wrote to convert 48x48 xbm (X bitmap) files
  23 #   into X-Face: headers suitable for inclusion in RFC822 internet
  24 #   electronic mail.  A 48x48 bitmap is awfully small, but X-Faces are still
  25 #   good enough for other people to visually establish your identity in
  26 #   email without having to carefully read your name.
  27 #
  28 #   Basically, it gets you noticed...either as the person with the cool
  29 #   X-Face or as that jerk with modem noise in all of his email messages.
  30 #
  31 #   People will start looking over your shoulder and say "Hey Cool!  How'd
  32 #   you do that?"  When they do, you just send 'em to my URL for this
  33 #   utility and tell 'em to upgrade to a real mail reader: XEmacs and VM.
  34 #
  35 # It also requires the 'compface' utility.
  36 #
  37
  38 sub check_for_help {
  39   local($param) = @_;
  40
  41   # is a filter, no args must be present
  42   if (defined($param))
  43   {
  44     print "\n", 'gif2xface -- A filter for converting an 48x48 gif into a xface string', "\n\n" ;
  45     print 'Usage:  gif2xface < input.gif > output.xface', "\n\n";
  46     exit;
  47   }
  48 }
  49
  50 sub reverse_byte {
  51     local($byte) = @_;
  52     local($n, $b);
  53     for ( $b= $n= 0; $b<8; ++$b) {
  54         $n |= (($byte & 1) << (7-$b));
  55         $byte >>= 1;
  56     }
  57     return($n);
  58 }
  59
  60
  61 &check_for_help($ARGV[0]);
  62
  63 # printf "0x%02x\n", &reverse_byte(0xF0);
  64
  65 $ra = rand;
  66 $tf = "/tmp/gif2xface.$ra";
  67 open(GP,"|giftopnm|pbmtoxbm>$tf");
  68
  69 while (<>) {
  70   print GP $_;
  71 }
  72 close(GP);
  73 open(GP,"<$tf");
  74 <GP>;
  75 m/^#define \w+_width (\d+)/ && ($width=$1);
  76 <GP>;
  77 m/^#define \w+_height (\d+)/ && ($height=$1);
  78 <GP>;
  79 m/^static.* = \{/ && (( $width == 48 && $height == 48 )
  80                       || die $0, ": sorry, xfaces must be 48x48 pixels" );
  81
  82 $| = 1; print "X-Face:";
  83
  84 open(CF,"|compface");
  85
  86 while (<GP>) {
  87     $st="";
  88     while (s/(0x..)(,|\};)\s*//) {
  89         $st .= sprintf("0x%02x, ", &reverse_byte(eval($1)));
  90     }
  91     $_=$st;
  92     s/(0x..), 0x(..)/\1\2/g;
  93     s/\s*(0x...., 0x...., 0x....)(,|\};)\s/\1,\n/g;
  94     print CF $_;
  95 }
  96 close (CF);
  97 close (GP);
  98 unlink $tf;