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package GD::Barcode::EAN13; |
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use strict; |
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use warnings; |
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use GD::Barcode; |
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our $VERSION = '1.99_04'; |
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use parent qw(Exporter); |
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use vars qw($VERSION @ISA $errStr); |
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@ISA = qw(GD::Barcode Exporter); |
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my $leftOddBar = { |
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'0' => '0001101', |
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'1' => '0011001', |
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'2' => '0010011', |
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'3' => '0111101', |
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'4' => '0100011', |
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'5' => '0110001', |
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'6' => '0101111', |
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'7' => '0111011', |
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'8' => '0110111', |
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'9' => '0001011' |
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}; |
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my $leftEvenBar = { |
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'0' => '0100111', |
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'1' => '0110011', |
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'2' => '0011011', |
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'3' => '0100001', |
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'4' => '0011101', |
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'5' => '0111001', |
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'6' => '0000101', |
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'7' => '0010001', |
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'8' => '0001001', |
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'9' => '0010111' |
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}; |
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my $rightBar = { |
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'0' => '1110010', |
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'1' => '1100110', |
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'2' => '1101100', |
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'3' => '1000010', |
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'4' => '1011100', |
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'5' => '1001110', |
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'6' => '1010000', |
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'7' => '1000100', |
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'8' => '1001000', |
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'9' => '1110100' |
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}; |
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my $guardBar = 'G0G'; |
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my $centerBar = '0G0G0'; |
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my $oddEven4EAN = { |
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0 => 'OOOOOO', |
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1 => 'OOEOEE', |
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2 => 'OOEEOE', |
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3 => 'OOEEEO', |
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4 => 'OEOOEE', |
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5 => 'OEEOOE', |
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6 => 'OEEEOO', |
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7 => 'OEOEOE', |
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8 => 'OEOEEO', |
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9 => 'OEEOEO' |
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}; |
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sub new { |
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my ( $sClass, $sTxt ) = @_; |
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$errStr = ''; |
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my $oThis = {}; |
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bless $oThis, $sClass; |
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return if ( $errStr = $oThis->init($sTxt) ); |
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return $oThis; |
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} |
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sub init { |
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my ( $oThis, $sTxt ) = @_; |
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#Check |
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return 'Invalid Characters' if ( $sTxt =~ /[^0-9]/ ); |
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#CalcCd |
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if ( length($sTxt) == 12 ) { |
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$sTxt .= calcEAN13CD($sTxt); |
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} |
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elsif ( length($sTxt) == 13 ) { |
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; |
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} |
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else { |
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return 'Invalid Length'; |
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} |
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$oThis->{text} = $sTxt; |
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return ''; |
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} |
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sub calcEAN13CD { |
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my ($sTxt) = @_; |
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my ( $i, $iSum ); |
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my @aWeight = ( 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3 ); |
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$iSum = 0; |
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for ( $i = 0 ; $i < 12 ; $i++ ) { |
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$iSum += substr( $sTxt, $i, 1 ) * $aWeight[$i]; |
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} |
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$iSum %= 10; |
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$iSum = ( $iSum == 0 ) ? 0 : ( 10 - $iSum ); |
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return "$iSum"; |
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} |
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sub barcode { |
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my ($oThis) = @_; |
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my ($sTxt); |
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my ( $oddEven, $i, $sBar ); |
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my ($sRes); |
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#(1)Init |
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$sTxt = $oThis->{text}; |
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$sRes = $guardBar; #GUARD |
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#(2)Left 7 letters |
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$oddEven = $oddEven4EAN->{ substr( $sTxt, 0, 1 ) }; |
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for ( $i = 1 ; $i < 7 ; $i++ ) { |
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$sBar = |
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( substr( $oddEven, $i - 1, 1 ) eq 'O' ) ? $leftOddBar : $leftEvenBar; |
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$sRes .= GD::Barcode::barPtn( substr( $sTxt, $i, 1 ), $sBar ); |
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} |
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#(4)Center |
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$sRes .= $centerBar; |
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#(5)Right |
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for ( $i = 7 ; $i < 13 ; $i++ ) { |
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$sRes .= GD::Barcode::barPtn( substr( $sTxt, $i, 1 ), $rightBar ); |
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} |
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#(6)GUARD |
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$sRes .= $guardBar; |
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return $sRes; |
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} |
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sub plot { |
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my ( $oThis, %hParam ) = @_; |
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#Barcode Pattern |
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my $sPtn = $oThis->barcode(); |
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#Create Image |
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require GD; |
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my $iHeight = ( $hParam{Height} ) ? $hParam{Height} : 50; |
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my ( $oGd, $cBlack ); |
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if ( $hParam{NoText} ) { |
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( $oGd, $cBlack ) = |
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GD::Barcode::plot( $sPtn, length($sPtn), $iHeight, 0, 0 ); |
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} |
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else { |
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my ( $fW, $fH ) = ( GD::Font->Small->width, GD::Font->Small->height ); |
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my $iWidth = length($sPtn) + $fW + 1; |
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( $oGd, $cBlack ) = |
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GD::Barcode::plot( $sPtn, $iWidth, $iHeight, $fH, $fW + 1 ); |
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$oGd->string( |
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GD::Font->Small, 0, |
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$iHeight - $fH, |
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substr( $oThis->{text}, 0, 1 ), $cBlack |
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); |
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$oGd->string( |
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GD::Font->Small, $fW + 8, |
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$iHeight - $fH, |
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substr( $oThis->{text}, 1, 6 ), $cBlack |
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); |
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$oGd->string( |
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GD::Font->Small, $fW + 55, |
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$iHeight - $fH, |
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substr( $oThis->{text}, 7, 6 ), $cBlack |
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); |
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} |
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return $oGd; |
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} |
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1; |
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__END__ |