1

2025-08-12 15:04:01 +08:00
parent df3f5f5269
commit 6708fb8eeb
544 changed files with 75169 additions and 17 deletions
@@ -0,0 +1,105 @@
+// 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};