text: /*
   * qrcode,QRCode
   * Version: 3.0.5
   ---
   ## 采用默认方式画二维码"
  引入本js, ./qrcode.js
   ````html
   <div id="qrcodeDefault"></div>
   ````
  
   ````javascript
  
   var qrnode = new QRCode({
       text: 'http://www.alipay.com/'
   });
   document.getElementById('qrcodeDefault').appendChild(qrnode);
   ````
  
   ## 调用table画二维码
  
   ````html
   <div id="qrcodeTable"></div>
   ````
  
   ````javascript
  
   var qrnode = new QRCode({
   render: 'table',
   correctLevel: 0,
   pdground: '#00aaee',
   text: 'http://www.alipay.com/',
   size: 100,
   image : 'https://t.alipayobjects.com/images/rmsweb/T1ZsxhXdxbXXXXXXXX.png'
   });
   document.getElementById('qrcodeTable').appendChild(qrnode);
   ````
  
   ## 调用canvas画二维码
  
   ````html
   <div id="qrcodeCanvas"></div>
   ````
  
   ````javascript
   var qrnode = new QRCode({
   render: 'canvas',
   correctLevel: 0,
   text: 'http://www.alipay.com/',
   size: 300,
   background: '#eeeeee',
   foreground: '#667766',
   pdground: '#00aaee',
   image : 'https://t.alipayobjects.com/images/rmsweb/T1ZsxhXdxbXXXXXXXX.png',
   imageSize : 100
   });
   document.getElementById('qrcodeCanvas').appendChild(qrnode);
   ````
  
   ## 调用svg画二维码
  
   ````html
   <div id="qrcodeSVG"></div>
   ````
  
   ````javascript
   var qrnode = new QRCode({
   correctLevel: 0,
   render: 'svg',
   text: 'http://www.alipay.com/',
   size: 200,
   pdground: '#00aaee',
   image : 'https://t.alipayobjects.com/images/rmsweb/T1ZsxhXdxbXXXXXXXX.png',
   imageSize:30
   });
   document.getElementById('qrcodeSVG').appendChild(qrnode);
   ````
  
   */
   
  
  (function(global){
    'use strict';
    function extend (object) {
      // Takes an unlimited number of extenders.
      var args = Array.prototype.slice.call(arguments, 1);
  
      // For each extender, copy their properties on our object.
      for (var i = 0, source; source = args[i]; i++) {
        if (!source) continue;
        for (var property in source) {
          object[property] = source[property];
        }
      }
  
      return object;
    }
  
    /**
     * module.exports = QRCodeAlg;
     */
  
    /**
     * 获取单个字符的utf8编码
     * unicode BMP平面约65535个字符
     * @param {num} code
     * return {array}
     */
    function unicodeFormat8(code) {
      var c0,c1,c2;
      // 1 byte
      if (code < 128) {
        return [code];
        // 2 bytes
      } else if (code < 2048) {
        c0 = 192 + (code >> 6);
        c1 = 128 + (code & 63);
        return [c0, c1];
        // 3 bytes
      } else {
        c0 = 224 + (code >> 12);
        c1 = 128 + (code >> 6 & 63);
        c2 = 128 + (code & 63);
        return [c0, c1, c2];
      }
    }
  
    /**
     * 获取字符串的utf8编码字节串
     * @param {string} string
     * @return {array}
     */
    function getUTF8Bytes(string) {
      var utf8codes = [];
      for (var i = 0; i < string.length; i++) {
        var code = string.charCodeAt(i);
        var utf8 = unicodeFormat8(code);
        for (var j = 0; j < utf8.length; j++) {
          utf8codes.push(utf8[j]);
        }
      }
      return utf8codes;
    }
  
    /**
     * 二维码算法实现
     * @param {string} data 要编码的信息字符串
     * @param {num} errorCorrectLevel 纠错等级
     */
    function QRCodeAlg(data, errorCorrectLevel) {
      this.typeNumber = -1; //版本
      this.errorCorrectLevel = errorCorrectLevel;
      this.modules = null; //二维矩阵，存放最终结果
      this.moduleCount = 0; //矩阵大小
      this.dataCache = null; //数据缓存
      this.rsBlocks = null; //版本数据信息
      this.totalDataCount = -1; //可使用的数据量
      this.data = data;
      this.utf8bytes = getUTF8Bytes(data);
      this.make();
    }
  
    QRCodeAlg.prototype = {
      constructor: QRCodeAlg,
      /**
       * 获取二维码矩阵大小
       * @return {num} 矩阵大小
       */
      getModuleCount: function getModuleCount() {
        return this.moduleCount;
      },
      /**
       * 编码
       */
      make: function make() {
        this.getRightType();
        this.dataCache = this.createData();
        this.createQrcode();
      },
      /**
       * 设置二位矩阵功能图形
       * @param  {bool} test 表示是否在寻找最好掩膜阶段
       * @param  {num} maskPattern 掩膜的版本
       */
      makeImpl: function makeImpl(maskPattern) {
  
        this.moduleCount = this.typeNumber * 4 + 17;
        this.modules = new Array(this.moduleCount);
  
        for (var row = 0; row < this.moduleCount; row++) {
  
          this.modules[row] = new Array(this.moduleCount);
        }
        this.setupPositionProbePattern(0, 0);
        this.setupPositionProbePattern(this.moduleCount - 7, 0);
        this.setupPositionProbePattern(0, this.moduleCount - 7);
        this.setupPositionAdjustPattern();
        this.setupTimingPattern();
        this.setupTypeInfo(true, maskPattern);
  
        if (this.typeNumber >= 7) {
          this.setupTypeNumber(true);
        }
        this.mapData(this.dataCache, maskPattern);
      },
      /**
       * 设置二维码的位置探测图形
       * @param  {num} row 探测图形的中心横坐标
       * @param  {num} col 探测图形的中心纵坐标
       */
      setupPositionProbePattern: function setupPositionProbePattern(row, col) {
  
        for (var r = -1; r <= 7; r++) {
  
          if (row + r <= -1 || this.moduleCount <= row + r) continue;
  
          for (var c = -1; c <= 7; c++) {
  
            if (col + c <= -1 || this.moduleCount <= col + c) continue;
  
            if (0 <= r && r <= 6 && (c == 0 || c == 6) || 0 <= c && c <= 6 && (r == 0 || r == 6) || 2 <= r && r <= 4 && 2 <= c && c <= 4) {
              this.modules[row + r][col + c] = true;
            } else {
              this.modules[row + r][col + c] = false;
            }
          }
        }
      },
      /**
       * 创建二维码
       * @return {[type]} [description]
       */
      createQrcode: function createQrcode() {
  
        var minLostPoint = 0;
        var pattern = 0;
        var bestModules = null;
  
        for (var i = 0; i < 8; i++) {
  
          this.makeImpl(i);
  
          var lostPoint = QRUtil.getLostPoint(this);
          if (i == 0 || minLostPoint > lostPoint) {
            minLostPoint = lostPoint;
            pattern = i;
            bestModules = this.modules;
          }
        }
        this.modules = bestModules;
        this.setupTypeInfo(false, pattern);
  
        if (this.typeNumber >= 7) {
          this.setupTypeNumber(false);
        }
      },
      /**
       * 设置定位图形
       * @return {[type]} [description]
       */
      setupTimingPattern: function setupTimingPattern() {
  
        for (var r = 8; r < this.moduleCount - 8; r++) {
          if (this.modules[r][6] != null) {
            continue;
          }
          this.modules[r][6] = r % 2 == 0;
  
          if (this.modules[6][r] != null) {
            continue;
          }
          this.modules[6][r] = r % 2 == 0;
        }
      },
      /**
       * 设置矫正图形
       * @return {[type]} [description]
       */
      setupPositionAdjustPattern: function setupPositionAdjustPattern() {
  
        var pos = QRUtil.getPatternPosition(this.typeNumber);
  
        for (var i = 0; i < pos.length; i++) {
  
          for (var j = 0; j < pos.length; j++) {
  
            var row = pos[i];
            var col = pos[j];
  
            if (this.modules[row][col] != null) {
              continue;
            }
  
            for (var r = -2; r <= 2; r++) {
  
              for (var c = -2; c <= 2; c++) {
  
                if (r == -2 || r == 2 || c == -2 || c == 2 || r == 0 && c == 0) {
                  this.modules[row + r][col + c] = true;
                } else {
                  this.modules[row + r][col + c] = false;
                }
              }
            }
          }
        }
      },
      /**
       * 设置版本信息（7以上版本才有）
       * @param  {bool} test 是否处于判断最佳掩膜阶段
       * @return {[type]}      [description]
       */
      setupTypeNumber: function setupTypeNumber(test) {
  
        var bits = QRUtil.getBCHTypeNumber(this.typeNumber);
  
        for (var i = 0; i < 18; i++) {
          var mod = !test && (bits >> i & 1) == 1;
          this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod;
          this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
        }
      },
      /**
       * 设置格式信息（纠错等级和掩膜版本）
       * @param  {bool} test
       * @param  {num} maskPattern 掩膜版本
       * @return {}
       */
      setupTypeInfo: function setupTypeInfo(test, maskPattern) {
  
        var data = QRErrorCorrectLevel[this.errorCorrectLevel] << 3 | maskPattern;
        var bits = QRUtil.getBCHTypeInfo(data);
  
        // vertical
        for (var i = 0; i < 15; i++) {
  
          var mod = !test && (bits >> i & 1) == 1;
  
          if (i < 6) {
            this.modules[i][8] = mod;
          } else if (i < 8) {
            this.modules[i + 1][8] = mod;
          } else {
            this.modules[this.moduleCount - 15 + i][8] = mod;
          }
  
          // horizontal
          var mod = !test && (bits >> i & 1) == 1;
  
          if (i < 8) {
            this.modules[8][this.moduleCount - i - 1] = mod;
          } else if (i < 9) {
            this.modules[8][15 - i - 1 + 1] = mod;
          } else {
            this.modules[8][15 - i - 1] = mod;
          }
        }
  
        // fixed module
        this.modules[this.moduleCount - 8][8] = !test;
      },
      /**
       * 数据编码
       * @return {[type]} [description]
       */
      createData: function createData() {
        var buffer = new QRBitBuffer();
        var lengthBits = this.typeNumber > 9 ? 16 : 8;
        buffer.put(4, 4); //添加模式
        buffer.put(this.utf8bytes.length, lengthBits);
        for (var i = 0, l = this.utf8bytes.length; i < l; i++) {
          buffer.put(this.utf8bytes[i], 8);
        }
        if (buffer.length + 4 <= this.totalDataCount * 8) {
          buffer.put(0, 4);
        }
  
        // padding
        while (buffer.length % 8 != 0) {
          buffer.putBit(false);
        }
  
        // padding
        while (true) {
  
          if (buffer.length >= this.totalDataCount * 8) {
            break;
          }
          buffer.put(QRCodeAlg.PAD0, 8);
  
          if (buffer.length >= this.totalDataCount * 8) {
            break;
          }
          buffer.put(QRCodeAlg.PAD1, 8);
        }
        return this.createBytes(buffer);
      },
      /**
       * 纠错码编码
       * @param  {buffer} buffer 数据编码
       * @return {[type]}
       */
      createBytes: function createBytes(buffer) {
  
        var offset = 0;
  
        var maxDcCount = 0;
        var maxEcCount = 0;
  
        var length = this.rsBlock.length / 3;
  
        var rsBlocks = new Array();
  
        for (var i = 0; i < length; i++) {
  
          var count = this.rsBlock[i * 3 + 0];
          var totalCount = this.rsBlock[i * 3 + 1];
          var dataCount = this.rsBlock[i * 3 + 2];
  
          for (var j = 0; j < count; j++) {
            rsBlocks.push([dataCount, totalCount]);
          }
        }
  
        var dcdata = new Array(rsBlocks.length);
        var ecdata = new Array(rsBlocks.length);
  
        for (var r = 0; r < rsBlocks.length; r++) {
  
          var dcCount = rsBlocks[r][0];
          var ecCount = rsBlocks[r][1] - dcCount;
  
          maxDcCount = Math.max(maxDcCount, dcCount);
          maxEcCount = Math.max(maxEcCount, ecCount);
  
          dcdata[r] = new Array(dcCount);
  
          for (var i = 0; i < dcdata[r].length; i++) {
            dcdata[r][i] = 0xff & buffer.buffer[i + offset];
          }
          offset += dcCount;
  
          var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
          var rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1);
  
          var modPoly = rawPoly.mod(rsPoly);
          ecdata[r] = new Array(rsPoly.getLength() - 1);
          for (var i = 0; i < ecdata[r].length; i++) {
            var modIndex = i + modPoly.getLength() - ecdata[r].length;
            ecdata[r][i] = modIndex >= 0 ? modPoly.get(modIndex) : 0;
          }
        }
  
        var data = new Array(this.totalDataCount);
        var index = 0;
  
        for (var i = 0; i < maxDcCount; i++) {
          for (var r = 0; r < rsBlocks.length; r++) {
            if (i < dcdata[r].length) {
              data[index++] = dcdata[r][i];
            }
          }
        }
  
        for (var i = 0; i < maxEcCount; i++) {
          for (var r = 0; r < rsBlocks.length; r++) {
            if (i < ecdata[r].length) {
              data[index++] = ecdata[r][i];
            }
          }
        }
  
        return data;
      },
      /**
       * 布置模块，构建最终信息
       * @param  {} data
       * @param  {} maskPattern
       * @return {}
       */
      mapData: function mapData(data, maskPattern) {
  
        var inc = -1;
        var row = this.moduleCount - 1;
        var bitIndex = 7;
        var byteIndex = 0;
  
        for (var col = this.moduleCount - 1; col > 0; col -= 2) {
  
          if (col == 6) col--;
  
          while (true) {
  
            for (var c = 0; c < 2; c++) {
  
              if (this.modules[row][col - c] == null) {
  
                var dark = false;
  
                if (byteIndex < data.length) {
                  dark = (data[byteIndex] >>> bitIndex & 1) == 1;
                }
  
                var mask = QRUtil.getMask(maskPattern, row, col - c);
  
                if (mask) {
                  dark = !dark;
                }
  
                this.modules[row][col - c] = dark;
                bitIndex--;
  
                if (bitIndex == -1) {
                  byteIndex++;
                  bitIndex = 7;
                }
              }
            }
  
            row += inc;
  
            if (row < 0 || this.moduleCount <= row) {
              row -= inc;
              inc = -inc;
              break;
            }
          }
        }
      }
  
    };
    /**
     * 填充字段
     */
    QRCodeAlg.PAD0 = 0xEC;
    QRCodeAlg.PAD1 = 0x11;
  
  //---------------------------------------------------------------------
  // 纠错等级对应的编码
  //---------------------------------------------------------------------
  
    var QRErrorCorrectLevel = [1, 0, 3, 2];
  
  //---------------------------------------------------------------------
  // 掩膜版本
  //---------------------------------------------------------------------
  
    var QRMaskPattern = {
      PATTERN000: 0,
      PATTERN001: 1,
      PATTERN010: 2,
      PATTERN011: 3,
      PATTERN100: 4,
      PATTERN101: 5,
      PATTERN110: 6,
      PATTERN111: 7
    };
  
  //---------------------------------------------------------------------
  // 工具类
  //---------------------------------------------------------------------
  
    var QRUtil = {
  
      /*
       每个版本矫正图形的位置
       */
      PATTERN_POSITION_TABLE: [[], [6, 18], [6, 22], [6, 26], [6, 30], [6, 34], [6, 22, 38], [6, 24, 42], [6, 26, 46], [6, 28, 50], [6, 30, 54], [6, 32, 58], [6, 34, 62], [6, 26, 46, 66], [6, 26, 48, 70], [6, 26, 50, 74], [6, 30, 54, 78], [6, 30, 56, 82], [6, 30, 58, 86], [6, 34, 62, 90], [6, 28, 50, 72, 94], [6, 26, 50, 74, 98], [6, 30, 54, 78, 102], [6, 28, 54, 80, 106], [6, 32, 58, 84, 110], [6, 30, 58, 86, 114], [6, 34, 62, 90, 118], [6, 26, 50, 74, 98, 122], [6, 30, 54, 78, 102, 126], [6, 26, 52, 78, 104, 130], [6, 30, 56, 82, 108, 134], [6, 34, 60, 86, 112, 138], [6, 30, 58, 86, 114, 142], [6, 34, 62, 90, 118, 146], [6, 30, 54, 78, 102, 126, 150], [6, 24, 50, 76, 102, 128, 154], [6, 28, 54, 80, 106, 132, 158], [6, 32, 58, 84, 110, 136, 162], [6, 26, 54, 82, 110, 138, 166], [6, 30, 58, 86, 114, 142, 170]],
  
      G15: 1 << 10 | 1 << 8 | 1 << 5 | 1 << 4 | 1 << 2 | 1 << 1 | 1 << 0,
      G18: 1 << 12 | 1 << 11 | 1 << 10 | 1 << 9 | 1 << 8 | 1 << 5 | 1 << 2 | 1 << 0,
      G15_MASK: 1 << 14 | 1 << 12 | 1 << 10 | 1 << 4 | 1 << 1,
  
      /*
       BCH编码格式信息
       */
      getBCHTypeInfo: function getBCHTypeInfo(data) {
        var d = data << 10;
        while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {
          d ^= QRUtil.G15 << QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15);
        }
        return (data << 10 | d) ^ QRUtil.G15_MASK;
      },
      /*
       BCH编码版本信息
       */
      getBCHTypeNumber: function getBCHTypeNumber(data) {
        var d = data << 12;
        while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {
          d ^= QRUtil.G18 << QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18);
        }
        return data << 12 | d;
      },
      /*
       获取BCH位信息
       */
      getBCHDigit: function getBCHDigit(data) {
  
        var digit = 0;
  
        while (data != 0) {
          digit++;
          data >>>= 1;
        }
  
        return digit;
      },
      /*
       获取版本对应的矫正图形位置
       */
      getPatternPosition: function getPatternPosition(typeNumber) {
        return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];
      },
      /*
       掩膜算法
       */
      getMask: function getMask(maskPattern, i, j) {
  
        switch (maskPattern) {
  
          case QRMaskPattern.PATTERN000:
            return (i + j) % 2 == 0;
          case QRMaskPattern.PATTERN001:
            return i % 2 == 0;
          case QRMaskPattern.PATTERN010:
            return j % 3 == 0;
          case QRMaskPattern.PATTERN011:
            return (i + j) % 3 == 0;
          case QRMaskPattern.PATTERN100:
            return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;
          case QRMaskPattern.PATTERN101:
            return i * j % 2 + i * j % 3 == 0;
          case QRMaskPattern.PATTERN110:
            return (i * j % 2 + i * j % 3) % 2 == 0;
          case QRMaskPattern.PATTERN111:
            return (i * j % 3 + (i + j) % 2) % 2 == 0;
  
          default:
            throw new Error("bad maskPattern:" + maskPattern);
        }
      },
      /*
       获取RS的纠错多项式
       */
      getErrorCorrectPolynomial: function getErrorCorrectPolynomial(errorCorrectLength) {
  
        var a = new QRPolynomial([1], 0);
  
        for (var i = 0; i < errorCorrectLength; i++) {
          a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0));
        }
  
        return a;
      },
      /*
       获取评价
       */
      getLostPoint: function getLostPoint(qrCode) {
  
        var moduleCount = qrCode.getModuleCount(),
            lostPoint = 0,
            darkCount = 0;
  
        for (var row = 0; row < moduleCount; row++) {
  
          var sameCount = 0;
          var head = qrCode.modules[row][0];
  
          for (var col = 0; col < moduleCount; col++) {
  
            var current = qrCode.modules[row][col];
  
            //level 3 评价
            if (col < moduleCount - 6) {
              if (current && !qrCode.modules[row][col + 1] && qrCode.modules[row][col + 2] && qrCode.modules[row][col + 3] && qrCode.modules[row][col + 4] && !qrCode.modules[row][col + 5] && qrCode.modules[row][col + 6]) {
                if (col < moduleCount - 10) {
                  if (qrCode.modules[row][col + 7] && qrCode.modules[row][col + 8] && qrCode.modules[row][col + 9] && qrCode.modules[row][col + 10]) {
                    lostPoint += 40;
                  }
                } else if (col > 3) {
                  if (qrCode.modules[row][col - 1] && qrCode.modules[row][col - 2] && qrCode.modules[row][col - 3] && qrCode.modules[row][col - 4]) {
                    lostPoint += 40;
                  }
                }
              }
            }
  
            //level 2 评价
            if (row < moduleCount - 1 && col < moduleCount - 1) {
              var count = 0;
              if (current) count++;
              if (qrCode.modules[row + 1][col]) count++;
              if (qrCode.modules[row][col + 1]) count++;
              if (qrCode.modules[row + 1][col + 1]) count++;
              if (count == 0 || count == 4) {
                lostPoint += 3;
              }
            }
  
            //level 1 评价
            if (head ^ current) {
              sameCount++;
            } else {
              head = current;
              if (sameCount >= 5) {
                lostPoint += 3 + sameCount - 5;
              }
              sameCount = 1;
            }
  
            //level 4 评价
            if (current) {
              darkCount++;
            }
          }
        }
  
        for (var col = 0; col < moduleCount; col++) {
  
          var sameCount = 0;
          var head = qrCode.modules[0][col];
  
          for (var row = 0; row < moduleCount; row++) {
  
            var current = qrCode.modules[row][col];
  
            //level 3 评价
            if (row < moduleCount - 6) {
              if (current && !qrCode.modules[row + 1][col] && qrCode.modules[row + 2][col] && qrCode.modules[row + 3][col] && qrCode.modules[row + 4][col] && !qrCode.modules[row + 5][col] && qrCode.modules[row + 6][col]) {
                if (row < moduleCount - 10) {
                  if (qrCode.modules[row + 7][col] && qrCode.modules[row + 8][col] && qrCode.modules[row + 9][col] && qrCode.modules[row + 10][col]) {
                    lostPoint += 40;
                  }
                } else if (row > 3) {
                  if (qrCode.modules[row - 1][col] && qrCode.modules[row - 2][col] && qrCode.modules[row - 3][col] && qrCode.modules[row - 4][col]) {
                    lostPoint += 40;
                  }
                }
              }
            }
  
            //level 1 评价
            if (head ^ current) {
              sameCount++;
            } else {
              head = current;
              if (sameCount >= 5) {
                lostPoint += 3 + sameCount - 5;
              }
              sameCount = 1;
            }
          }
        }
  
        // LEVEL4
  
        var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
        lostPoint += ratio * 10;
  
        return lostPoint;
      }
  
    };
  
  //---------------------------------------------------------------------
  // QRMath使用的数学工具
  //---------------------------------------------------------------------
  
    var QRMath = {
      /*
       将n转化为a^m
       */
      glog: function glog(n) {
  
        if (n < 1) {
          throw new Error("glog(" + n + ")");
        }
  
        return QRMath.LOG_TABLE[n];
      },
      /*
       将a^m转化为n
       */
      gexp: function gexp(n) {
  
        while (n < 0) {
          n += 255;
        }
  
        while (n >= 256) {
          n -= 255;
        }
  
        return QRMath.EXP_TABLE[n];
      },
  
      EXP_TABLE: new Array(256),
  
      LOG_TABLE: new Array(256)
  
    };
  
    for (var i = 0; i < 8; i++) {
      QRMath.EXP_TABLE[i] = 1 << i;
    }
    for (var i = 8; i < 256; i++) {
      QRMath.EXP_TABLE[i] = QRMath.EXP_TABLE[i - 4] ^ QRMath.EXP_TABLE[i - 5] ^ QRMath.EXP_TABLE[i - 6] ^ QRMath.EXP_TABLE[i - 8];
    }
    for (var i = 0; i < 255; i++) {
      QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i;
    }
  
  //---------------------------------------------------------------------
  // QRPolynomial 多项式
  //---------------------------------------------------------------------
    /**
     * 多项式类
     * @param {Array} num   系数
     * @param {num} shift a^shift
     */
    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 get(index) {
        return this.num[index];
      },
  
      getLength: function getLength() {
        return this.num.length;
      },
      /**
       * 多项式乘法
       * @param  {QRPolynomial} e 被乘多项式
       * @return {[type]}   [description]
       */
      multiply: function multiply(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);
      },
      /**
       * 多项式模运算
       * @param  {QRPolynomial} e 模多项式
       * @return {}
       */
      mod: function mod(e) {
        var tl = this.getLength(),
            el = e.getLength();
        if (tl - el < 0) {
          return this;
        }
        var num = new Array(tl);
        for (var i = 0; i < tl; i++) {
          num[i] = this.get(i);
        }
        while (num.length >= el) {
          var ratio = QRMath.glog(num[0]) - QRMath.glog(e.get(0));
  
          for (var i = 0; i < e.getLength(); i++) {
            num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio);
          }
          while (num[0] == 0) {
            num.shift();
          }
        }
        return new QRPolynomial(num, 0);
      }
    };
  
  //---------------------------------------------------------------------
  // RS_BLOCK_TABLE
  //---------------------------------------------------------------------
    /*
     二维码各个版本信息[块数, 每块中的数据块数, 每块中的信息块数]
     */
    var RS_BLOCK_TABLE = [
  
  // L
  // M
  // Q
  // H
  
  // 1
      [1, 26, 19], [1, 26, 16], [1, 26, 13], [1, 26, 9],
  
  // 2
      [1, 44, 34], [1, 44, 28], [1, 44, 22], [1, 44, 16],
  
  // 3
      [1, 70, 55], [1, 70, 44], [2, 35, 17], [2, 35, 13],
  
  // 4
      [1, 100, 80], [2, 50, 32], [2, 50, 24], [4, 25, 9],
  
  // 5
      [1, 134, 108], [2, 67, 43], [2, 33, 15, 2, 34, 16], [2, 33, 11, 2, 34, 12],
  
  // 6
      [2, 86, 68], [4, 43, 27], [4, 43, 19], [4, 43, 15],
  
  // 7
      [2, 98, 78], [4, 49, 31], [2, 32, 14, 4, 33, 15], [4, 39, 13, 1, 40, 14],
  
  // 8
      [2, 121, 97], [2, 60, 38, 2, 61, 39], [4, 40, 18, 2, 41, 19], [4, 40, 14, 2, 41, 15],
  
  // 9
      [2, 146, 116], [3, 58, 36, 2, 59, 37], [4, 36, 16, 4, 37, 17], [4, 36, 12, 4, 37, 13],
  
  // 10
      [2, 86, 68, 2, 87, 69], [4, 69, 43, 1, 70, 44], [6, 43, 19, 2, 44, 20], [6, 43, 15, 2, 44, 16],
  
  // 11
      [4, 101, 81], [1, 80, 50, 4, 81, 51], [4, 50, 22, 4, 51, 23], [3, 36, 12, 8, 37, 13],
  
  // 12
      [2, 116, 92, 2, 117, 93], [6, 58, 36, 2, 59, 37], [4, 46, 20, 6, 47, 21], [7, 42, 14, 4, 43, 15],
  
  // 13
      [4, 133, 107], [8, 59, 37, 1, 60, 38], [8, 44, 20, 4, 45, 21], [12, 33, 11, 4, 34, 12],
  
  // 14
      [3, 145, 115, 1, 146, 116], [4, 64, 40, 5, 65, 41], [11, 36, 16, 5, 37, 17], [11, 36, 12, 5, 37, 13],
  
  // 15
      [5, 109, 87, 1, 110, 88], [5, 65, 41, 5, 66, 42], [5, 54, 24, 7, 55, 25], [11, 36, 12],
  
  // 16
      [5, 122, 98, 1, 123, 99], [7, 73, 45, 3, 74, 46], [15, 43, 19, 2, 44, 20], [3, 45, 15, 13, 46, 16],
  
  // 17
      [1, 135, 107, 5, 136, 108], [10, 74, 46, 1, 75, 47], [1, 50, 22, 15, 51, 23], [2, 42, 14, 17, 43, 15],
  
  // 18
      [5, 150, 120, 1, 151, 121], [9, 69, 43, 4, 70, 44], [17, 50, 22, 1, 51, 23], [2, 42, 14, 19, 43, 15],
  
  // 19
      [3, 141, 113, 4, 142, 114], [3, 70, 44, 11, 71, 45], [17, 47, 21, 4, 48, 22], [9, 39, 13, 16, 40, 14],
  
  // 20
      [3, 135, 107, 5, 136, 108], [3, 67, 41, 13, 68, 42], [15, 54, 24, 5, 55, 25], [15, 43, 15, 10, 44, 16],
  
  // 21
      [4, 144, 116, 4, 145, 117], [17, 68, 42], [17, 50, 22, 6, 51, 23], [19, 46, 16, 6, 47, 17],
  
  // 22
      [2, 139, 111, 7, 140, 112], [17, 74, 46], [7, 54, 24, 16, 55, 25], [34, 37, 13],
  
  // 23
      [4, 151, 121, 5, 152, 122], [4, 75, 47, 14, 76, 48], [11, 54, 24, 14, 55, 25], [16, 45, 15, 14, 46, 16],
  
  // 24
      [6, 147, 117, 4, 148, 118], [6, 73, 45, 14, 74, 46], [11, 54, 24, 16, 55, 25], [30, 46, 16, 2, 47, 17],
  
  // 25
      [8, 132, 106, 4, 133, 107], [8, 75, 47, 13, 76, 48], [7, 54, 24, 22, 55, 25], [22, 45, 15, 13, 46, 16],
  
  // 26
      [10, 142, 114, 2, 143, 115], [19, 74, 46, 4, 75, 47], [28, 50, 22, 6, 51, 23], [33, 46, 16, 4, 47, 17],
  
  // 27
      [8, 152, 122, 4, 153, 123], [22, 73, 45, 3, 74, 46], [8, 53, 23, 26, 54, 24], [12, 45, 15, 28, 46, 16],
  
  // 28
      [3, 147, 117, 10, 148, 118], [3, 73, 45, 23, 74, 46], [4, 54, 24, 31, 55, 25], [11, 45, 15, 31, 46, 16],
  
  // 29
      [7, 146, 116, 7, 147, 117], [21, 73, 45, 7, 74, 46], [1, 53, 23, 37, 54, 24], [19, 45, 15, 26, 46, 16],
  
  // 30
      [5, 145, 115, 10, 146, 116], [19, 75, 47, 10, 76, 48], [15, 54, 24, 25, 55, 25], [23, 45, 15, 25, 46, 16],
  
  // 31
      [13, 145, 115, 3, 146, 116], [2, 74, 46, 29, 75, 47], [42, 54, 24, 1, 55, 25], [23, 45, 15, 28, 46, 16],
  
  // 32
      [17, 145, 115], [10, 74, 46, 23, 75, 47], [10, 54, 24, 35, 55, 25], [19, 45, 15, 35, 46, 16],
  
  // 33
      [17, 145, 115, 1, 146, 116], [14, 74, 46, 21, 75, 47], [29, 54, 24, 19, 55, 25], [11, 45, 15, 46, 46, 16],
  
  // 34
      [13, 145, 115, 6, 146, 116], [14, 74, 46, 23, 75, 47], [44, 54, 24, 7, 55, 25], [59, 46, 16, 1, 47, 17],
  
  // 35
      [12, 151, 121, 7, 152, 122], [12, 75, 47, 26, 76, 48], [39, 54, 24, 14, 55, 25], [22, 45, 15, 41, 46, 16],
  
  // 36
      [6, 151, 121, 14, 152, 122], [6, 75, 47, 34, 76, 48], [46, 54, 24, 10, 55, 25], [2, 45, 15, 64, 46, 16],
  
  // 37
      [17, 152, 122, 4, 153, 123], [29, 74, 46, 14, 75, 47], [49, 54, 24, 10, 55, 25], [24, 45, 15, 46, 46, 16],
  
  // 38
      [4, 152, 122, 18, 153, 123], [13, 74, 46, 32, 75, 47], [48, 54, 24, 14, 55, 25], [42, 45, 15, 32, 46, 16],
  
  // 39
      [20, 147, 117, 4, 148, 118], [40, 75, 47, 7, 76, 48], [43, 54, 24, 22, 55, 25], [10, 45, 15, 67, 46, 16],
  
  // 40
      [19, 148, 118, 6, 149, 119], [18, 75, 47, 31, 76, 48], [34, 54, 24, 34, 55, 25], [20, 45, 15, 61, 46, 16]];
  
    /**
     * 根据数据获取对应版本
     * @return {[type]} [description]
     */
    QRCodeAlg.prototype.getRightType = function () {
      for (var typeNumber = 1; typeNumber < 41; typeNumber++) {
        var rsBlock = RS_BLOCK_TABLE[(typeNumber - 1) * 4 + this.errorCorrectLevel];
        if (rsBlock == undefined) {
          throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + this.errorCorrectLevel);
        }
        var length = rsBlock.length / 3;
        var totalDataCount = 0;
        for (var i = 0; i < length; i++) {
          var count = rsBlock[i * 3 + 0];
          var dataCount = rsBlock[i * 3 + 2];
          totalDataCount += dataCount * count;
        }
  
        var lengthBytes = typeNumber > 9 ? 2 : 1;
        if (this.utf8bytes.length + lengthBytes < totalDataCount || typeNumber == 40) {
          this.typeNumber = typeNumber;
          this.rsBlock = rsBlock;
          this.totalDataCount = totalDataCount;
          break;
        }
      }
    };
  
  //---------------------------------------------------------------------
  // QRBitBuffer
  //---------------------------------------------------------------------
  
    function QRBitBuffer() {
      this.buffer = new Array();
      this.length = 0;
    }
  
    QRBitBuffer.prototype = {
  
      get: function get(index) {
        var bufIndex = Math.floor(index / 8);
        return this.buffer[bufIndex] >>> 7 - index % 8 & 1;
      },
  
      put: function put(num, length) {
        for (var i = 0; i < length; i++) {
          this.putBit(num >>> length - i - 1 & 1);
        }
      },
  
      putBit: function putBit(bit) {
  
        var bufIndex = Math.floor(this.length / 8);
        if (this.buffer.length <= bufIndex) {
          this.buffer.push(0);
        }
  
        if (bit) {
          this.buffer[bufIndex] |= 0x80 >>> this.length % 8;
        }
  
        this.length++;
      }
    };
  
    var qrcodeAlgObjCache = [];
  
    /**
     * 计算矩阵点的前景色
     * @param {Obj} config
     * @param {Number} config.row 点x坐标
     * @param {Number} config.col 点y坐标
     * @param {Number} config.count 矩阵大小
     * @param {Number} config.options 组件的options
     * @return {String}
     */
    var getForeGround = function getForeGround(config) {
      var options = config.options;
      if (options.pdground && (config.row > 1 && config.row < 5 && config.col > 1 && config.col < 5 || config.row > config.count - 6 && config.row < config.count - 2 && config.col > 1 && config.col < 5 || config.row > 1 && config.row < 5 && config.col > config.count - 6 && config.col < config.count - 2)) {
        return options.pdground;
      }
      return options.foreground;
    };
    /**
     * 点是否在Position Detection
     * @param  {row} 矩阵行
     * @param  {col} 矩阵列
     * @param  {count} 矩阵大小
     * @return {Boolean}
     */
    var inPositionDetection = function inPositionDetection(row, col, count) {
      if (row < 7 && col < 7 || row > count - 8 && col < 7 || row < 7 && col > count - 8) {
        return true;
      }
      return false;
    };
  
    /**
     * 二维码构造函数，主要用于绘制
     * @param  {参数列表} opt 传递参数
     * @return {}
     */
    var qrcode = function qrcode(opt) {
      if (typeof opt === 'string') {
        // 只编码ASCII字符串
        opt = {
          text: opt
        };
      }
      //设置默认参数
      this.options = extend({}, {
        text: '',
        render: '',
        size: 256,
        correctLevel: 3,
        background: '#ffffff',
        foreground: '#000000',
        image: '',
        imageSize: 30
      }, opt);
  
      //使用QRCodeAlg创建二维码结构
      var qrCodeAlg = null;
      for (var i = 0, l = qrcodeAlgObjCache.length; i < l; i++) {
        if (qrcodeAlgObjCache[i].text == this.options.text && qrcodeAlgObjCache[i].text.correctLevel == this.options.correctLevel) {
          qrCodeAlg = qrcodeAlgObjCache[i].obj;
          break;
        }
      }
  
      if (i == l) {
        qrCodeAlg = new QRCodeAlg(this.options.text, this.options.correctLevel);
        qrcodeAlgObjCache.push({ text: this.options.text, correctLevel: this.options.correctLevel, obj: qrCodeAlg });
      }
  
      if (this.options.render) {
        switch (this.options.render) {
          case 'canvas':
            return this.createCanvas(qrCodeAlg);
          case 'table':
            return this.createTable(qrCodeAlg);
          case 'svg':
            return this.createSVG(qrCodeAlg);
          default:
            return this.createDefault(qrCodeAlg);
        }
      }
      return this.createDefault(qrCodeAlg);
    };
  
    extend(qrcode.prototype, {
      // default create  canvas -> svg -> table
      createDefault: function createDefault(qrCodeAlg) {
        var canvas = document.createElement('canvas');
        if (canvas.getContext) {
          return this.createCanvas(qrCodeAlg);
        }
        var SVG_NS = 'http://www.w3.org/2000/svg';
        if (!!document.createElementNS && !!document.createElementNS(SVG_NS, 'svg').createSVGRect) {
          return this.createSVG(qrCodeAlg);
        }
        return this.createTable(qrCodeAlg);
      },
      // canvas create
      createCanvas: function createCanvas(qrCodeAlg) {
        var options = this.options;
        var canvas = document.createElement('canvas');
        var ctx = canvas.getContext('2d');
        var count = qrCodeAlg.getModuleCount();
        // preload photo
        var loadImage = function loadImage(url, callback) {
          var img = new Image();
          img.src = url;
          img.onload = function () {
            callback(this);
            img.onload = null;
          };
        };
  
        //计算每个点的长宽
        var tileW = (options.size / count).toPrecision(4);
        var tileH = (options.size / count).toPrecision(4);
  
        canvas.width = options.size;
        canvas.height = options.size;
  
        //绘制
        for (var row = 0; row < count; row++) {
          for (var col = 0; col < count; col++) {
            var w = Math.ceil((col + 1) * tileW) - Math.floor(col * tileW);
            var h = Math.ceil((row + 1) * tileW) - Math.floor(row * tileW);
            var foreground = getForeGround({
              row: row,
              col: col,
              count: count,
              options: options
            });
            ctx.fillStyle = qrCodeAlg.modules[row][col] ? foreground : options.background;
            ctx.fillRect(Math.round(col * tileW), Math.round(row * tileH), w, h);
          }
        }
        if (options.image) {
          loadImage(options.image, function (img) {
            var x = ((options.size - options.imageSize) / 2).toFixed(2);
            var y = ((options.size - options.imageSize) / 2).toFixed(2);
            ctx.drawImage(img, x, y, options.imageSize, options.imageSize);
          });
        }
        return canvas;
      },
      // table create
      createTable: function createTable(qrCodeAlg) {
        var options = this.options;
        var count = qrCodeAlg.getModuleCount();
  
        // 计算每个节点的长宽；取整，防止点之间出现分离
        var tileW = Math.floor(options.size / count);
        var tileH = Math.floor(options.size / count);
        if (tileW <= 0) {
          tileW = count < 80 ? 2 : 1;
        }
        if (tileH <= 0) {
          tileH = count < 80 ? 2 : 1;
        }
  
        //创建table节点
        //重算码大小
        var s = [];
        s.push('<table style="border:0px; margin:0px; padding:0px; border-collapse:collapse; background-color:' + options.background + ';">');
  
        // 绘制二维码
        for (var row = 0; row < count; row++) {
          s.push('<tr style="border:0px; margin:0px; padding:0px; height:' + tileH + 'px">');
          for (var col = 0; col < count; col++) {
            var foreground = getForeGround({
              row: row,
              col: col,
              count: count,
              options: options
            });
            if (qrCodeAlg.modules[row][col]) {
              s.push('<td style="border:0px; margin:0px; padding:0px; width:' + tileW + 'px; background-color:' + foreground + '"></td>');
            } else {
              s.push('<td style="border:0px; margin:0px; padding:0px; width:' + tileW + 'px; background-color:' + options.background + '"></td>');
            }
          }
          s.push('</tr>');
        }
        s.push('</table>');
  
        if (options.image) {
          // 计算表格的总大小
          var width = tileW * count;
          var height = tileH * count;
          var x = ((width - options.imageSize) / 2).toFixed(2);
          var y = ((height - options.imageSize) / 2).toFixed(2);
          s.unshift('<div style=\'position:relative; \n                        width:' + width + 'px; \n                        height:' + height + 'px;\'>');
          s.push('<photo src=\'' + options.image + '\' \n                        width=\'' + options.imageSize + '\' \n                        height=\'' + options.imageSize + '\' \n                        style=\'position:absolute;left:' + x + 'px; top:' + y + 'px;\'>');
          s.push('</div>');
        }
  
        var span = document.createElement('span');
        span.innerHTML = s.join('');
  
        return span.firstChild;
      },
      // create svg
      createSVG: function createSVG(qrCodeAlg) {
        var options = this.options;
        var count = qrCodeAlg.getModuleCount();
        var scale = count / options.size;
  
        // create svg
        var svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
        svg.setAttribute('width', options.size);
        svg.setAttribute('height', options.size);
        svg.setAttribute('viewBox', '0 0 ' + count + ' ' + count);
  
        for (var row = 0; row < count; row++) {
          for (var col = 0; col < count; col++) {
            var rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
            var foreground = getForeGround({
              row: row,
              col: col,
              count: count,
              options: options
            });
            rect.setAttribute('x', col);
            rect.setAttribute('y', row);
            rect.setAttribute('width', 1);
            rect.setAttribute('height', 1);
            rect.setAttribute('stroke-width', 0);
            if (qrCodeAlg.modules[row][col]) {
              rect.setAttribute('fill', foreground);
            } else {
              rect.setAttribute('fill', options.background);
            }
            svg.appendChild(rect);
          }
        }
  
        // create image
        if (options.image) {
          var img = document.createElementNS('http://www.w3.org/2000/svg', 'image');
          img.setAttributeNS('http://www.w3.org/1999/xlink', 'href', options.image);
          img.setAttribute('x', ((count - options.imageSize * scale) / 2).toFixed(2));
          img.setAttribute('y', ((count - options.imageSize * scale) / 2).toFixed(2));
          img.setAttribute('width', options.imageSize * scale);
          img.setAttribute('height', options.imageSize * scale);
          svg.appendChild(img);
        }
  
        return svg;
      }
    });
  
      window.QRCode = qrcode;
  
      if (typeof define === "function") {
          define(function(require, exports, module) {
              module.exports  = qrcode;
          })
      }
  
  })(window);
  