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Annotation of loncom/cgi/barcode.png, revision 1.5

1.1       harris41    1: #!/usr/bin/perl
                      2: 
                      3: # The LearningOnline Network with CAPA
1.5     ! harris41    4: # barcode.gif - A CGI script that dynamically outputs a barcode.
        !             5: #
        !             6: # $Id$
        !             7: #
        !             8: # Copyright Michigan State University Board of Trustees
        !             9: #
        !            10: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
        !            11: #
        !            12: # LON-CAPA is free software; you can redistribute it and/or modify
        !            13: # it under the terms of the GNU General Public License as published by
        !            14: # the Free Software Foundation; either version 2 of the License, or
        !            15: # (at your option) any later version.
        !            16: #
        !            17: # LON-CAPA is distributed in the hope that it will be useful,
        !            18: # but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            19: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            20: # GNU General Public License for more details.
        !            21: #
        !            22: # You should have received a copy of the GNU General Public License
        !            23: # along with LON-CAPA; if not, write to the Free Software
        !            24: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
        !            25: #
        !            26: # /home/httpd/html/adm/gpl.txt
        !            27: #
        !            28: # http://www.lon-capa.org/
        !            29: #
1.1       harris41   30: # Scott Harrison
                     31: # YEAR=2001
1.5     ! harris41   32: # 8/15,9/28,12/11
        !            33: #
        !            34: ###
1.1       harris41   35: 
                     36: # I'm using format=Code39.
                     37: # The valid formats are
                     38: # EAN13, EAN8, UPCA, UPCE, NW7, Code39,
                     39: # ITF, IATA2of5, Matrix2of5, and COOP2of5.
                     40: 
1.2       harris41   41: # Example usage: /cgi-bin/barcode.gif?encode=12345*31*MSUL1
                     42: 
1.1       harris41   43: use strict;
                     44: use GD::Barcode::Code39;
                     45: 
                     46: map {
                     47:     my ($name, $value) = split(/=/,$_);
                     48:     $value =~ tr/+/ /;
                     49:     $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                     50:     if ($name eq 'encode') {
                     51: 	$ENV{'form.'.$name}=$value;
                     52:     }
                     53: } (split(/&/,$ENV{'QUERY_STRING'}));
                     54: 
                     55: # Tell the server we are sending a gif graphic
                     56: print <<END;
                     57: Content-type: image/gif
                     58: 
                     59: END
                     60: 
1.3       harris41   61: unless(defined($ENV{'form.encode'}) and length($ENV{'form.encode'})) {
                     62:     $ENV{'form.encode'}='***ERROR***UNDEFINED***';
                     63: }
                     64: 
1.1       harris41   65: my $oGdBar=GD::Barcode::Code39->new($ENV{'form.encode'});
1.3       harris41   66: if ($GD::Barcode::errStr or !defined($oGdBar)) {
                     67:     warn($GD::Barcode::errStr);
                     68:     $oGdBar=GD::Barcode::Code39->new('***ERROR***INVALID***');
                     69: }
1.1       harris41   70: my $bindata=$oGdBar->plot->png; # create barcode image
                     71: undef $oGdBar;
                     72: binmode(STDOUT);
1.3       harris41   73: open OUT,"|pngtopnm|ppmtogif 2>/dev/null"; # convert into gif image
1.1       harris41   74: print OUT $bindata; # output image
                     75: $|=1; # be sure to flush before closing
                     76: close OUT;