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2025-08-12 15:04:01 +08:00
parent df3f5f5269
commit 6708fb8eeb
544 changed files with 75169 additions and 17 deletions
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+// Encoding documentation:
+// https://en.wikipedia.org/wiki/Code_93#Detailed_outline
+
+import { SYMBOLS, BINARIES, MULTI_SYMBOLS } from './constants';
+import Barcode from "../Barcode.js";
+
+class CODE93 extends Barcode {
+	constructor(data, options){
+		super(data, options);
+	}
+
+	valid(){
+		return /^[0-9A-Z\-. $/+%]+$/.test(this.data);
+	}
+
+	encode(){
+		const symbols = this.data
+			.split('')
+			.flatMap(c => MULTI_SYMBOLS[c] || c);
+		const encoded = symbols
+			.map(s => CODE93.getEncoding(s))
+			.join('');
+
+		// Compute checksum symbols
+		const csumC = CODE93.checksum(symbols, 20);
+		const csumK = CODE93.checksum(symbols.concat(csumC), 15);
+
+		return {
+			text: this.text,
+			data:
+				// Add the start bits
+				CODE93.getEncoding('\xff') +
+				// Add the encoded bits
+				encoded +
+				// Add the checksum
+				CODE93.getEncoding(csumC) + CODE93.getEncoding(csumK) +
+				// Add the stop bits
+				CODE93.getEncoding('\xff') +
+				// Add the termination bit
+				'1'
+		};
+	}
+
+	// Get the binary encoding of a symbol
+	static getEncoding(symbol) {
+		return BINARIES[CODE93.symbolValue(symbol)];
+	}
+
+	// Get the symbol for a symbol value
+	static getSymbol(symbolValue) {
+		return SYMBOLS[symbolValue];
+	}
+
+	// Get the symbol value of a symbol
+	static symbolValue(symbol) {
+		return SYMBOLS.indexOf(symbol);
+	}
+
+	// Calculate a checksum symbol
+	static checksum(symbols, maxWeight) {
+		const csum = symbols
+			.slice()
+			.reverse()
+			.reduce((sum, symbol, idx) => {
+				const weight = (idx % maxWeight) + 1;
+				return sum + (CODE93.symbolValue(symbol) * weight);
+			}, 0);
+
+		return CODE93.getSymbol(csum % 47);
+	}
+}
+
+export default CODE93;