更新

TongjiUniApp/node_modules/qrcode-reader/src/gf256.js

@@ -0,0 +1,109 @@
+/*
+  Ported to JavaScript by Lazar Laszlo 2011
+
+  lazarsoft@gmail.com, www.lazarsoft.info
+
+*/
+
+/*
+*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import GF256Poly from './gf256poly';
+
+export default function GF256(primitive) {
+  this.expTable = new Array(256);
+  this.logTable = new Array(256);
+  var x = 1;
+  for (var i = 0; i < 256; i++) {
+    this.expTable[i] = x;
+    x <<= 1; // x = x * 2; we're assuming the generator alpha is 2
+    if (x >= 0x100) {
+      x ^= primitive;
+    }
+  }
+  for (var i = 0; i < 255; i++) {
+    this.logTable[this.expTable[i]] = i;
+  }
+  // logTable[0] == 0 but this should never be used
+  var at0 = new Array(1); at0[0] = 0;
+  this.zero = new GF256Poly(this, new Array(at0));
+  var at1 = new Array(1); at1[0] = 1;
+  this.one = new GF256Poly(this, new Array(at1));
+}
+
+Object.defineProperty(GF256.prototype, "Zero", {
+  get: function() {
+    return this.zero;
+  }
+});
+
+Object.defineProperty(GF256.prototype, "One", {
+  get: function() {
+    return this.one;
+  }
+});
+
+GF256.prototype.buildMonomial = function(degree,  coefficient) {
+  if (degree < 0) {
+    throw "System.ArgumentException";
+  }
+  if (coefficient == 0) {
+    return this.zero;
+  }
+  var coefficients = new Array(degree + 1);
+  for (var i = 0; i < coefficients.length; i++)coefficients[i] = 0;
+  coefficients[0] = coefficient;
+  return new GF256Poly(this, coefficients);
+};
+
+GF256.prototype.exp = function(a) {
+  return this.expTable[a];
+};
+
+GF256.prototype.log = function(a) {
+  if (a == 0) {
+    throw "System.ArgumentException";
+  }
+  return this.logTable[a];
+};
+
+GF256.prototype.inverse = function(a) {
+  if (a == 0) {
+    throw "System.ArithmeticException";
+  }
+  return this.expTable[255 - this.logTable[a]];
+};
+
+GF256.prototype.addOrSubtract = function(a,  b) {
+  return a ^ b;
+};
+
+GF256.prototype.multiply = function(a,  b) {
+  if (a == 0 || b == 0) {
+    return 0;
+  }
+  if (a == 1) {
+    return b;
+  }
+  if (b == 1) {
+    return a;
+  }
+  return this.expTable[(this.logTable[a] + this.logTable[b]) % 255];
+};
+
+GF256.QR_CODE_FIELD = new GF256(0x011D);
+GF256.DATA_MATRIX_FIELD = new GF256(0x012D);