/usr/share/perl5/GD/Barcode/EAN8.pm is in libgd-barcode-perl 1.15-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 | package GD::Barcode::EAN8;
use strict;
BEGIN { eval{require 'GD.pm';}; };
use GD::Barcode;
require Exporter;
use vars qw($VERSION @ISA $errStr);
@ISA = qw(GD::Barcode Exporter);
$VERSION=1.10;
my $leftOddBar ={
'0' => '0001101',
'1' => '0011001',
'2' => '0010011',
'3' => '0111101',
'4' => '0100011',
'5' => '0110001',
'6' => '0101111',
'7' => '0111011',
'8' => '0110111',
'9' => '0001011'
};
my $rightBar = {
'0' => '1110010',
'1' => '1100110',
'2' => '1101100',
'3' => '1000010',
'4' => '1011100',
'5' => '1001110',
'6' => '1010000',
'7' => '1000100',
'8' => '1001000',
'9' => '1110100'
};
my $guardBar = 'G0G';
my $centerBar = '0G0G0';
#------------------------------------------------------------------------------
# new (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub new($$) {
my($sClass, $sTxt) = @_;
$errStr ='';
my $oThis = {};
bless $oThis;
return undef if($errStr = $oThis->init($sTxt));
return $oThis;
}
#------------------------------------------------------------------------------
# init (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub init($$){
my($oThis, $sTxt) =@_;
#Check
return 'Invalid Characters' if($sTxt =~ /[^0-9]/);
#CalcCd
if( length($sTxt) == 7 ) {
$sTxt .= calcEAN8CD( $sTxt ) ;
}
elsif(length($sTxt) == 8) {
;
}
else {
return 'Invalid Length';
}
$oThis->{text} = $sTxt;
return '';
}
#------------------------------------------------------------------------------
# calcEAN8CD (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub calcEAN8CD($) {
my( $sTxt ) = @_;
my( $i, $iSum);
my @aWeight = (3, 1, 3, 1, 3, 1, 3);
$iSum = 0;
for( $i = 0; $i < 7; $i++ ){
$iSum += substr($sTxt, $i, 1) * $aWeight[$i];
}
$iSum %= 10;
$iSum = ($iSum == 0)? 0: (10 - $iSum);
return "$iSum";
}
#------------------------------------------------------------------------------
# new (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub barcode($) {
my ($oThis) = @_;
my($i, $sRes);
#(1) Init
my $sTxt = $oThis->{text};
$sRes = $guardBar; #GUARD
#(2) Left 4
for( $i = 0; $i < 4; $i++ ) {
$sRes .= GD::Barcode::barPtn( substr($sTxt, $i, 1), $leftOddBar );
}
#(3) Center
$sRes .= $centerBar;
#(4) Right 4 bytes
for( $i = 4; $i < 8; $i++ ) {
$sRes .= GD::Barcode::barPtn( substr($sTxt, $i, 1), $rightBar );
}
#(5)GUARD
$sRes .= $guardBar;
return $sRes;
}
#------------------------------------------------------------------------------
# plot (for GD::Barcode::EAN8)
#------------------------------------------------------------------------------
sub plot($;%) {
my($oThis, %hParam) =@_;
my $sPtn = $oThis->barcode();
#Create Image
my $iHeight = ($hParam{Height})? $hParam{Height} : 50;
my($oGd, $cBlack);
if($hParam{NoText}) {
($oGd, $cBlack) = GD::Barcode::plot($sPtn, length($sPtn), $iHeight, 0, 0);
}
else {
my($fW,$fH) = (GD::Font->Small->width,GD::Font->Small->height);
my $iWidth = length($sPtn);
#$ ($oGd, $cBlack) = GD::Barcode::plot($sPtn, $iWidth, $iHeight, $fH, $fW+1);
($oGd, $cBlack) = GD::Barcode::plot($sPtn, $iWidth, $iHeight, $fH, 0);
$oGd->string(GD::Font->Small, $fW + 1, $iHeight - $fH, substr($oThis->{text}, 0, 4), $cBlack);
$oGd->string(GD::Font->Small, $fW + 33, $iHeight - $fH, substr($oThis->{text}, 4, 4), $cBlack);
}
return $oGd;
}
1;
__END__
=head1 NAME
GD::Barcode::EAN8 - Create EAN8(JAN8) barcode image with GD
=head1 SYNOPSIS
I<ex. CGI>
use GD::Barcode::EAN8;
binmode(STDOUT);
print "Content-Type: image/png\n\n";
print GD::Barcode::EAN8->new('1234567')->plot->png;
I<with Error Check>
my $oGdBar = GD::Barcode::EAN8->new('123456789');
die $GD::Barcode::EAN8::errStr unless($oGdBar); #Invalid Length
=head1 DESCRIPTION
GD::Barcode::EAN8 is a subclass of GD::Barcode and allows you to
create EAN8(JAN8) barcode image with GD.
This module based on "Generate Barcode Ver 1.02 By Shisei Hanai 97/08/22".
=head2 new
I<$oGdBar> = GD::Barcode::EAN8->new(I<$sTxt>);
Constructor.
Creates a GD::Barcode::EAN8 object for I<$sTxt>.
I<$sTxt> has 7 or 8 numeric characters([0-9]).
If I<$sTxt> has 12 characters, this module calacurates CD for you.
=head2 plot()
I<$oGd> = $oGdBar->plot([Height => I<$iHeight>, NoText => I<0 | 1>]);
creates GD object with barcode image for the I<$sTxt> specified at L<new> method.
I<$iHeight> is height of the image. If I<NoText> is 1, the image has no text image of I<$sTxt>.
ex.
my $oGdB = GD::Barcode::EAN8->new('1234567');
my $oGD = $oGdB->plot(NoText=>1, Height => 20);
# $sGD is a GD image with Height=>20 pixels, with no text.
=head2 barcode()
I<$sPtn> = $oGdBar->barcode();
returns a barcode pattern in string with '1', 'G' and '0'.
'1' means black, 'G' also means black but little bit long,
'0' means white.
ex.
my $oGdB = GD::Barcode::EAN8->new('1234567');
my $sPtn = $oGdB->barcode();
# $sPtn = '';
=head2 $errStr
$GD::Barcode::EAN8::errStr
has error message.
=head2 $text
$oGdBar->{$text}
has barcode text based on I<$sTxt> specified in L<new> method.
=head1 AUTHOR
Kawai Takanori GCD00051@nifty.ne.jp
=head1 COPYRIGHT
The GD::Barocde::EAN8 module is Copyright (c) 2000 Kawai Takanori. Japan.
All rights reserved.
You may distribute under the terms of either the GNU General Public
License or the Artistic License, as specified in the Perl README file.
=head1 SEE ALSO
GD::Barcode
=cut
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