perl GD-Barcode GD::Barcode GD::Barcode::COOP2of5 GD::Barcode::Code39 GD::Barcode::EAN13 GD::Barcode::EAN8 GD::Barcode::IATA2of5 GD::Barcode::ITF GD::Barcode::Industrial2of5 GD::Barcode::Matrix2of5 GD::Barcode::NW7 GD::Barcode::QRcode GD::Barcode::UPCA GD::Barcode::UPCE