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/var/lang/lib/node_modules/npm/node_modules/qrcode-terminal/vendor/QRCode

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QRPolynomial.js1.3 KB · 67 lines
var QRMath = require('./QRMath'); function QRPolynomial(num, shift) {	if (num.length === undefined) {		throw new Error(num.length + "/" + shift);	} 	var offset = 0; 	while (offset < num.length && num[offset] === 0) {		offset++;	} 	this.num = new Array(num.length - offset + shift);	for (var i = 0; i < num.length - offset; i++) {		this.num[i] = num[i + offset];	}} QRPolynomial.prototype = { 	get : function(index) {		return this.num[index];	},		getLength : function() {		return this.num.length;	},		multiply : function(e) {			var num = new Array(this.getLength() + e.getLength() - 1);			for (var i = 0; i < this.getLength(); i++) {			for (var j = 0; j < e.getLength(); j++) {				num[i + j] ^= QRMath.gexp(QRMath.glog(this.get(i) ) + QRMath.glog(e.get(j) ) );			}		}			return new QRPolynomial(num, 0);	},		mod : function(e) {			if (this.getLength() - e.getLength() < 0) {			return this;		}			var ratio = QRMath.glog(this.get(0) ) - QRMath.glog(e.get(0) );			var num = new Array(this.getLength() );				for (var i = 0; i < this.getLength(); i++) {			num[i] = this.get(i);		}				for (var x = 0; x < e.getLength(); x++) {			num[x] ^= QRMath.gexp(QRMath.glog(e.get(x) ) + ratio);		}			// recursive call		return new QRPolynomial(num, 0).mod(e);	}}; module.exports = QRPolynomial;