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Annotation of loncom/cgi/barcode.png, revision 1.12

1.1       harris41    1: #!/usr/bin/perl
                      2: 
                      3: # The LearningOnline Network with CAPA
1.10      albertel    4: # barcode.png - A CGI script that dynamically outputs a barcode.
1.5       harris41    5: #
1.12    ! albertel    6: # $Id: barcode.png,v 1.11 2003/02/03 18:03:52 harris41 Exp $
1.5       harris41    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: #
                     30: ###
1.1       harris41   31: 
                     32: # I'm using format=Code39.
                     33: # The valid formats are
                     34: # EAN13, EAN8, UPCA, UPCE, NW7, Code39,
                     35: # ITF, IATA2of5, Matrix2of5, and COOP2of5.
                     36: 
1.2       harris41   37: # Example usage: /cgi-bin/barcode.gif?encode=12345*31*MSUL1
                     38: 
1.1       harris41   39: use strict;
                     40: use GD::Barcode::Code39;
                     41: 
1.7       matthew    42: $|=1;   # Autoflush after each print/write
1.12    ! albertel   43: my %env;
1.6       harris41   44: foreach (split(/&/,$ENV{'QUERY_STRING'})) {
1.1       harris41   45:     my ($name, $value) = split(/=/,$_);
                     46:     $value =~ tr/+/ /;
                     47:     $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                     48:     if ($name eq 'encode') {
1.12    ! albertel   49: 	$env{'form.'.$name}=$value;
1.1       harris41   50:     }
1.6       harris41   51: }
1.1       harris41   52: 
1.10      albertel   53: # Tell the server we are sending a png graphic
1.1       harris41   54: print <<END;
1.10      albertel   55: Content-type: image/png
1.1       harris41   56: 
                     57: END
                     58: 
1.12    ! albertel   59: unless(defined($env{'form.encode'}) and length($env{'form.encode'})) {
        !            60:     $env{'form.encode'}='***ERROR***UNDEFINED***';
1.3       harris41   61: }
1.12    ! albertel   62: my $text = '*'.uc($env{'form.encode'}).'*';
1.8       matthew    63: my $oGdBar=GD::Barcode::Code39->new($text);
1.3       harris41   64: if ($GD::Barcode::errStr or !defined($oGdBar)) {
                     65:     warn($GD::Barcode::errStr);
                     66:     $oGdBar=GD::Barcode::Code39->new('***ERROR***INVALID***');
                     67: }
1.1       harris41   68: my $bindata=$oGdBar->plot->png; # create barcode image
                     69: undef $oGdBar;
                     70: binmode(STDOUT);
1.10      albertel   71: #open OUT,"|pngtopnm|ppmtogif 2>/dev/null"; # convert into gif image
                     72: #print OUT $bindata; # output image
                     73: #$|=1; # be sure to flush before closing
                     74: #close OUT;
                     75: print $bindata;

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