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| // Encoding documentation:
| // https://en.wikipedia.org/wiki/Code_39#Encoding
|
| import Barcode from "../Barcode.js";
|
| class CODE39 extends Barcode {
| constructor(data, options){
| data = data.toUpperCase();
|
| // Calculate mod43 checksum if enabled
| if(options.mod43){
| data += getCharacter(mod43checksum(data));
| }
|
| super(data, options);
| }
|
| encode(){
| // First character is always a *
| var result = getEncoding("*");
|
| // Take every character and add the binary representation to the result
| for(let i = 0; i < this.data.length; i++){
| result += getEncoding(this.data[i]) + "0";
| }
|
| // Last character is always a *
| result += getEncoding("*");
|
| return {
| data: result,
| text: this.text
| };
| }
|
| valid(){
| return this.data.search(/^[0-9A-Z\-\.\ \$\/\+\%]+$/) !== -1;
| }
| }
|
|
|
|
|
|
| // All characters. The position in the array is the (checksum) value
| var characters = [
| "0", "1", "2", "3",
| "4", "5", "6", "7",
| "8", "9", "A", "B",
| "C", "D", "E", "F",
| "G", "H", "I", "J",
| "K", "L", "M", "N",
| "O", "P", "Q", "R",
| "S", "T", "U", "V",
| "W", "X", "Y", "Z",
| "-", ".", " ", "$",
| "/", "+", "%", "*"
| ];
|
| // The decimal representation of the characters, is converted to the
| // corresponding binary with the getEncoding function
| var encodings = [
| 20957, 29783, 23639, 30485,
| 20951, 29813, 23669, 20855,
| 29789, 23645, 29975, 23831,
| 30533, 22295, 30149, 24005,
| 21623, 29981, 23837, 22301,
| 30023, 23879, 30545, 22343,
| 30161, 24017, 21959, 30065,
| 23921, 22385, 29015, 18263,
| 29141, 17879, 29045, 18293,
| 17783, 29021, 18269, 17477,
| 17489, 17681, 20753, 35770
| ];
|
| // Get the binary representation of a character by converting the encodings
| // from decimal to binary
| function getEncoding(character){
| return getBinary(characterValue(character));
| }
|
| function getBinary(characterValue){
| return encodings[characterValue].toString(2);
| }
|
| function getCharacter(characterValue){
| return characters[characterValue];
| }
|
| function characterValue(character){
| return characters.indexOf(character);
| }
|
| function mod43checksum(data){
| var checksum = 0;
| for(let i = 0; i < data.length; i++){
| checksum += characterValue(data[i]);
| }
|
| checksum = checksum % 43;
| return checksum;
| }
|
| export {CODE39};
|
|
