diff options
Diffstat (limited to 'deps/node/deps/npm/node_modules/qrcode-terminal/vendor/QRCode/QRPolynomial.js')
-rw-r--r-- | deps/node/deps/npm/node_modules/qrcode-terminal/vendor/QRCode/QRPolynomial.js | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/deps/node/deps/npm/node_modules/qrcode-terminal/vendor/QRCode/QRPolynomial.js b/deps/node/deps/npm/node_modules/qrcode-terminal/vendor/QRCode/QRPolynomial.js new file mode 100644 index 00000000..f8754cbc --- /dev/null +++ b/deps/node/deps/npm/node_modules/qrcode-terminal/vendor/QRCode/QRPolynomial.js @@ -0,0 +1,66 @@ +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; |