qrcode_base64/qrcode_base64.js

var globalConfig = {
    colors: [],
    backgrounds: []
  }
  /**
   * qrcode
   * @param typeNumber 1 to 40
   * @param errorCorrectLevel 'L','M','Q','H'
   */
  var qrcode = function (typeNumber, errorCorrectLevel) {
  
    var PAD0 = 0xEC;
    var PAD1 = 0x11;
  
    var _typeNumber = typeNumber;
    var _errorCorrectLevel = QRErrorCorrectLevel[errorCorrectLevel];
    var _modules = null;
    var _moduleCount = 0;
    var _dataCache = null;
    var _dataList = new Array();
  
    var _this = {};
  
    var makeImpl = function (test, maskPattern) {
  
      _moduleCount = _typeNumber * 4 + 17;
      _modules = function (moduleCount) {
        var modules = new Array(moduleCount);
        for (var row = 0; row < moduleCount; row += 1) {
          modules[row] = new Array(moduleCount);
          for (var col = 0; col < moduleCount; col += 1) {
            modules[row][col] = null;
          }
        }
        return modules;
      }(_moduleCount);
  
      setupPositionProbePattern(0, 0);
      setupPositionProbePattern(_moduleCount - 7, 0);
      setupPositionProbePattern(0, _moduleCount - 7);
      setupPositionAdjustPattern();
      setupTimingPattern();
      setupTypeInfo(test, maskPattern);
  
      if (_typeNumber >= 7) {
        setupTypeNumber(test);
      }
  
      if (_dataCache == null) {
        _dataCache = createData(_typeNumber, _errorCorrectLevel, _dataList);
      }
  
      mapData(_dataCache, maskPattern);
    };
  
    var setupPositionProbePattern = function (row, col) {
  
      for (var r = -1; r <= 7; r += 1) {
  
        if (row + r <= -1 || _moduleCount <= row + r) continue;
  
        for (var c = -1; c <= 7; c += 1) {
  
          if (col + c <= -1 || _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)) {
            _modules[row + r][col + c] = true;
          } else {
            _modules[row + r][col + c] = false;
          }
        }
      }
    };
  
    var getBestMaskPattern = function () {
  
      var minLostPoint = 0;
      var pattern = 0;
  
      for (var i = 0; i < 8; i += 1) {
  
        makeImpl(true, i);
  
        var lostPoint = QRUtil.getLostPoint(_this);
  
        if (i == 0 || minLostPoint > lostPoint) {
          minLostPoint = lostPoint;
          pattern = i;
        }
      }
  
      return pattern;
    };
  
    var setupTimingPattern = function () {
  
      for (var r = 8; r < _moduleCount - 8; r += 1) {
        if (_modules[r][6] != null) {
          continue;
        }
        _modules[r][6] = (r % 2 == 0);
      }
  
      for (var c = 8; c < _moduleCount - 8; c += 1) {
        if (_modules[6][c] != null) {
          continue;
        }
        _modules[6][c] = (c % 2 == 0);
      }
    };
  
    var setupPositionAdjustPattern = function () {
  
      var pos = QRUtil.getPatternPosition(_typeNumber);
  
      for (var i = 0; i < pos.length; i += 1) {
  
        for (var j = 0; j < pos.length; j += 1) {
  
          var row = pos[i];
          var col = pos[j];
  
          if (_modules[row][col] != null) {
            continue;
          }
  
          for (var r = -2; r <= 2; r += 1) {
  
            for (var c = -2; c <= 2; c += 1) {
  
              if (r == -2 || r == 2 || c == -2 || c == 2
                || (r == 0 && c == 0)) {
                _modules[row + r][col + c] = true;
              } else {
                _modules[row + r][col + c] = false;
              }
            }
          }
        }
      }
    };
  
    var setupTypeNumber = function (test) {
  
      var bits = QRUtil.getBCHTypeNumber(_typeNumber);
  
      for (var i = 0; i < 18; i += 1) {
        var mod = (!test && ((bits >> i) & 1) == 1);
        _modules[Math.floor(i / 3)][i % 3 + _moduleCount - 8 - 3] = mod;
      }
  
      for (var i = 0; i < 18; i += 1) {
        var mod = (!test && ((bits >> i) & 1) == 1);
        _modules[i % 3 + _moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
      }
    };
  
    var setupTypeInfo = function (test, maskPattern) {
  
      var data = (_errorCorrectLevel << 3) | maskPattern;
      var bits = QRUtil.getBCHTypeInfo(data);
  
      // vertical
      for (var i = 0; i < 15; i += 1) {
  
        var mod = (!test && ((bits >> i) & 1) == 1);
  
        if (i < 6) {
          _modules[i][8] = mod;
        } else if (i < 8) {
          _modules[i + 1][8] = mod;
        } else {
          _modules[_moduleCount - 15 + i][8] = mod;
        }
      }
  
      // horizontal
      for (var i = 0; i < 15; i += 1) {
  
        var mod = (!test && ((bits >> i) & 1) == 1);
  
        if (i < 8) {
          _modules[8][_moduleCount - i - 1] = mod;
        } else if (i < 9) {
          _modules[8][15 - i - 1 + 1] = mod;
        } else {
          _modules[8][15 - i - 1] = mod;
        }
      }
  
      // fixed module
      _modules[_moduleCount - 8][8] = (!test);
    };
  
    var mapData = function (data, maskPattern) {
  
      var inc = -1;
      var row = _moduleCount - 1;
      var bitIndex = 7;
      var byteIndex = 0;
      var maskFunc = QRUtil.getMaskFunction(maskPattern);
  
      for (var col = _moduleCount - 1; col > 0; col -= 2) {
  
        if (col == 6) col -= 1;
  
        while (true) {
  
          for (var c = 0; c < 2; c += 1) {
  
            if (_modules[row][col - c] == null) {
  
              var dark = false;
  
              if (byteIndex < data.length) {
                dark = (((data[byteIndex] >>> bitIndex) & 1) == 1);
              }
  
              var mask = maskFunc(row, col - c);
  
              if (mask) {
                dark = !dark;
              }
  
              _modules[row][col - c] = dark;
              bitIndex -= 1;
  
              if (bitIndex == -1) {
                byteIndex += 1;
                bitIndex = 7;
              }
            }
          }
  
          row += inc;
  
          if (row < 0 || _moduleCount <= row) {
            row -= inc;
            inc = -inc;
            break;
          }
        }
      }
    };
  
    var createBytes = function (buffer, rsBlocks) {
  
      var offset = 0;
  
      var maxDcCount = 0;
      var maxEcCount = 0;
  
      var dcdata = new Array(rsBlocks.length);
      var ecdata = new Array(rsBlocks.length);
  
      for (var r = 0; r < rsBlocks.length; r += 1) {
  
        var dcCount = rsBlocks[r].dataCount;
        var ecCount = rsBlocks[r].totalCount - 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 += 1) {
          dcdata[r][i] = 0xff & buffer.getBuffer()[i + offset];
        }
        offset += dcCount;
  
        var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
        var rawPoly = 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 += 1) {
          var modIndex = i + modPoly.getLength() - ecdata[r].length;
          ecdata[r][i] = (modIndex >= 0) ? modPoly.getAt(modIndex) : 0;
        }
      }
  
      var totalCodeCount = 0;
      for (var i = 0; i < rsBlocks.length; i += 1) {
        totalCodeCount += rsBlocks[i].totalCount;
      }
  
      var data = new Array(totalCodeCount);
      var index = 0;
  
      for (var i = 0; i < maxDcCount; i += 1) {
        for (var r = 0; r < rsBlocks.length; r += 1) {
          if (i < dcdata[r].length) {
            data[index] = dcdata[r][i];
            index += 1;
          }
        }
      }
  
      for (var i = 0; i < maxEcCount; i += 1) {
        for (var r = 0; r < rsBlocks.length; r += 1) {
          if (i < ecdata[r].length) {
            data[index] = ecdata[r][i];
            index += 1;
          }
        }
      }
  
      return data;
    };
  
    var createData = function (typeNumber, errorCorrectLevel, dataList) {
  
      var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);
  
      var buffer = qrBitBuffer();
  
      for (var i = 0; i < dataList.length; i += 1) {
        var data = dataList[i];
        buffer.put(data.getMode(), 4);
        buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber));
        data.write(buffer);
      }
  
      // calc num max data.
      var totalDataCount = 0;
      for (var i = 0; i < rsBlocks.length; i += 1) {
        totalDataCount += rsBlocks[i].dataCount;
      }
  
      if (buffer.getLengthInBits() > totalDataCount * 8) {
        throw new Error('code length overflow. ('
          + buffer.getLengthInBits()
          + '>'
          + totalDataCount * 8
          + ')');
      }
  
      // end code
      if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
        buffer.put(0, 4);
      }
  
      // padding
      while (buffer.getLengthInBits() % 8 != 0) {
        buffer.putBit(false);
      }
  
      // padding
      while (true) {
  
        if (buffer.getLengthInBits() >= totalDataCount * 8) {
          break;
        }
        buffer.put(PAD0, 8);
  
        if (buffer.getLengthInBits() >= totalDataCount * 8) {
          break;
        }
        buffer.put(PAD1, 8);
      }
  
      return createBytes(buffer, rsBlocks);
    };
  
    _this.addData = function (data) {
      var newData = qr8BitByte(data);
      _dataList.push(newData);
      _dataCache = null;
    };
  
    _this.isDark = function (row, col) {
      if (row < 0 || _moduleCount <= row || col < 0 || _moduleCount <= col) {
        throw new Error(row + ',' + col);
      }
      return _modules[row][col];
    };
  
    _this.getModuleCount = function () {
      return _moduleCount;
    };
  
    _this.make = function () {
      makeImpl(false, getBestMaskPattern());
    };
  
    _this.createTableTag = function (cellSize, margin) {
  
      cellSize = cellSize || 2;
      margin = (typeof margin == 'undefined') ? cellSize * 4 : margin;
  
      var qrHtml = '';
  
      qrHtml += '<table style="';
      qrHtml += ' border-width: 0px; border-style: none;';
      qrHtml += ' border-collapse: collapse;';
      qrHtml += ' padding: 0px; margin: ' + margin + 'px;';
      qrHtml += '">';
      qrHtml += '<tbody>';
  
      for (var r = 0; r < _this.getModuleCount(); r += 1) {
  
        qrHtml += '<tr>';
  
        for (var c = 0; c < _this.getModuleCount(); c += 1) {
          qrHtml += '<td style="';
          qrHtml += ' border-width: 0px; border-style: none;';
          qrHtml += ' border-collapse: collapse;';
          qrHtml += ' padding: 0px; margin: 0px;';
          qrHtml += ' width: ' + cellSize + 'px;';
          qrHtml += ' height: ' + cellSize + 'px;';
          qrHtml += ' background-color: ';
          qrHtml += _this.isDark(r, c) ? '#000000' : '#ffffff';
          qrHtml += ';';
          qrHtml += '"/>';
        }
  
        qrHtml += '</tr>';
      }
  
      qrHtml += '</tbody>';
      qrHtml += '</table>';
  
      return qrHtml;
    };
  
    _this.createImgTag = function (cellSize, margin, size) {
  
      cellSize = cellSize || 2;
      margin = (typeof margin == 'undefined') ? cellSize * 4 : margin;
  
      var min = margin;
      var max = _this.getModuleCount() * cellSize + margin;
  
      return createImgTag(size, size, function (x, y) {
        if (min <= x && x < max && min <= y && y < max) {
          var c = Math.floor((x - min) / cellSize);
          var r = Math.floor((y - min) / cellSize);
          return _this.isDark(r, c) ? 0 : 1;
        } else {
          return 1;
        }
      });
    };
  
    return _this;
  };
  
  //---------------------------------------------------------------------
  // qrcode.stringToBytes
  //---------------------------------------------------------------------
  
  qrcode.stringToBytes = function (s) {
    var bytes = new Array();
    for (var i = 0; i < s.length; i += 1) {
      var c = s.charCodeAt(i);
      bytes.push(c & 0xff);
    }
    return bytes;
  };
  
  //---------------------------------------------------------------------
  // qrcode.createStringToBytes
  //---------------------------------------------------------------------
  
  /**
   * @param unicodeData base64 string of byte array.
   * [16bit Unicode],[16bit Bytes], ...
   * @param numChars
   */
  qrcode.createStringToBytes = function (unicodeData, numChars) {
  
    // create conversion map.
  
    var unicodeMap = function () {
  
      var bin = base64DecodeInputStream(unicodeData);
      var read = function () {
        var b = bin.read();
        if (b == -1) throw new Error();
        return b;
      };
  
      var count = 0;
      var unicodeMap = {};
      while (true) {
        var b0 = bin.read();
        if (b0 == -1) break;
        var b1 = read();
        var b2 = read();
        var b3 = read();
        var k = String.fromCharCode((b0 << 8) | b1);
        var v = (b2 << 8) | b3;
        unicodeMap[k] = v;
        count += 1;
      }
      if (count != numChars) {
        throw new Error(count + ' != ' + numChars);
      }
  
      return unicodeMap;
    }();
  
    var unknownChar = '?'.charCodeAt(0);
  
    return function (s) {
      var bytes = new Array();
      for (var i = 0; i < s.length; i += 1) {
        var c = s.charCodeAt(i);
        if (c < 128) {
          bytes.push(c);
        } else {
          var b = unicodeMap[s.charAt(i)];
          if (typeof b == 'number') {
            if ((b & 0xff) == b) {
              // 1byte
              bytes.push(b);
            } else {
              // 2bytes
              bytes.push(b >>> 8);
              bytes.push(b & 0xff);
            }
          } else {
            bytes.push(unknownChar);
          }
        }
      }
      return bytes;
    };
  };
  
  //---------------------------------------------------------------------
  // QRMode
  //---------------------------------------------------------------------
  
  var QRMode = {
    MODE_NUMBER: 1 << 0,
    MODE_ALPHA_NUM: 1 << 1,
    MODE_8BIT_BYTE: 1 << 2,
    MODE_KANJI: 1 << 3
  };
  
  //---------------------------------------------------------------------
  // QRErrorCorrectLevel
  //---------------------------------------------------------------------
  
  var QRErrorCorrectLevel = {
    L: 1,
    M: 0,
    Q: 3,
    H: 2
  };
  
  //---------------------------------------------------------------------
  // QRMaskPattern
  //---------------------------------------------------------------------
  
  var QRMaskPattern = {
    PATTERN000: 0,
    PATTERN001: 1,
    PATTERN010: 2,
    PATTERN011: 3,
    PATTERN100: 4,
    PATTERN101: 5,
    PATTERN110: 6,
    PATTERN111: 7
  };
  
  //---------------------------------------------------------------------
  // QRUtil
  //---------------------------------------------------------------------
  
  var QRUtil = function () {
  
    var 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]
    ];
    var G15 = (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0);
    var G18 = (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0);
    var G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1);
  
    var _this = {};
  
    var getBCHDigit = function (data) {
      var digit = 0;
      while (data != 0) {
        digit += 1;
        data >>>= 1;
      }
      return digit;
    };
  
    _this.getBCHTypeInfo = function (data) {
      var d = data << 10;
      while (getBCHDigit(d) - getBCHDigit(G15) >= 0) {
        d ^= (G15 << (getBCHDigit(d) - getBCHDigit(G15)));
      }
      return ((data << 10) | d) ^ G15_MASK;
    };
  
    _this.getBCHTypeNumber = function (data) {
      var d = data << 12;
      while (getBCHDigit(d) - getBCHDigit(G18) >= 0) {
        d ^= (G18 << (getBCHDigit(d) - getBCHDigit(G18)));
      }
      return (data << 12) | d;
    };
  
    _this.getPatternPosition = function (typeNumber) {
      return PATTERN_POSITION_TABLE[typeNumber - 1];
    };
  
    _this.getMaskFunction = function (maskPattern) {
  
      switch (maskPattern) {
  
        case QRMaskPattern.PATTERN000:
          return function (i, j) { return (i + j) % 2 == 0; };
        case QRMaskPattern.PATTERN001:
          return function (i, j) { return i % 2 == 0; };
        case QRMaskPattern.PATTERN010:
          return function (i, j) { return j % 3 == 0; };
        case QRMaskPattern.PATTERN011:
          return function (i, j) { return (i + j) % 3 == 0; };
        case QRMaskPattern.PATTERN100:
          return function (i, j) { return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0; };
        case QRMaskPattern.PATTERN101:
          return function (i, j) { return (i * j) % 2 + (i * j) % 3 == 0; };
        case QRMaskPattern.PATTERN110:
          return function (i, j) { return ((i * j) % 2 + (i * j) % 3) % 2 == 0; };
        case QRMaskPattern.PATTERN111:
          return function (i, j) { return ((i * j) % 3 + (i + j) % 2) % 2 == 0; };
  
        default:
          throw new Error('bad maskPattern:' + maskPattern);
      }
    };
  
    _this.getErrorCorrectPolynomial = function (errorCorrectLength) {
      var a = qrPolynomial([1], 0);
      for (var i = 0; i < errorCorrectLength; i += 1) {
        a = a.multiply(qrPolynomial([1, QRMath.gexp(i)], 0));
      }
      return a;
    };
  
    _this.getLengthInBits = function (mode, type) {
  
      if (1 <= type && type < 10) {
  
        // 1 - 9
  
        switch (mode) {
          case QRMode.MODE_NUMBER: return 10;
          case QRMode.MODE_ALPHA_NUM: return 9;
          case QRMode.MODE_8BIT_BYTE: return 8;
          case QRMode.MODE_KANJI: return 8;
          default:
            throw new Error('mode:' + mode);
        }
  
      } else if (type < 27) {
  
        // 10 - 26
  
        switch (mode) {
          case QRMode.MODE_NUMBER: return 12;
          case QRMode.MODE_ALPHA_NUM: return 11;
          case QRMode.MODE_8BIT_BYTE: return 16;
          case QRMode.MODE_KANJI: return 10;
          default:
            throw new Error('mode:' + mode);
        }
  
      } else if (type < 41) {
  
        // 27 - 40
  
        switch (mode) {
          case QRMode.MODE_NUMBER: return 14;
          case QRMode.MODE_ALPHA_NUM: return 13;
          case QRMode.MODE_8BIT_BYTE: return 16;
          case QRMode.MODE_KANJI: return 12;
          default:
            throw new Error('mode:' + mode);
        }
  
      } else {
        throw new Error('type:' + type);
      }
    };
  
    _this.getLostPoint = function (qrcode) {
  
      var moduleCount = qrcode.getModuleCount();
  
      var lostPoint = 0;
  
      // LEVEL1
  
      for (var row = 0; row < moduleCount; row += 1) {
        for (var col = 0; col < moduleCount; col += 1) {
  
          var sameCount = 0;
          var dark = qrcode.isDark(row, col);
  
          for (var r = -1; r <= 1; r += 1) {
  
            if (row + r < 0 || moduleCount <= row + r) {
              continue;
            }
  
            for (var c = -1; c <= 1; c += 1) {
  
              if (col + c < 0 || moduleCount <= col + c) {
                continue;
              }
  
              if (r == 0 && c == 0) {
                continue;
              }
  
              if (dark == qrcode.isDark(row + r, col + c)) {
                sameCount += 1;
              }
            }
          }
  
          if (sameCount > 5) {
            lostPoint += (3 + sameCount - 5);
          }
        }
      };
  
      // LEVEL2
  
      for (var row = 0; row < moduleCount - 1; row += 1) {
        for (var col = 0; col < moduleCount - 1; col += 1) {
          var count = 0;
          if (qrcode.isDark(row, col)) count += 1;
          if (qrcode.isDark(row + 1, col)) count += 1;
          if (qrcode.isDark(row, col + 1)) count += 1;
          if (qrcode.isDark(row + 1, col + 1)) count += 1;
          if (count == 0 || count == 4) {
            lostPoint += 3;
          }
        }
      }
  
      // LEVEL3
  
      for (var row = 0; row < moduleCount; row += 1) {
        for (var col = 0; col < moduleCount - 6; col += 1) {
          if (qrcode.isDark(row, col)
            && !qrcode.isDark(row, col + 1)
            && qrcode.isDark(row, col + 2)
            && qrcode.isDark(row, col + 3)
            && qrcode.isDark(row, col + 4)
            && !qrcode.isDark(row, col + 5)
            && qrcode.isDark(row, col + 6)) {
            lostPoint += 40;
          }
        }
      }
  
      for (var col = 0; col < moduleCount; col += 1) {
        for (var row = 0; row < moduleCount - 6; row += 1) {
          if (qrcode.isDark(row, col)
            && !qrcode.isDark(row + 1, col)
            && qrcode.isDark(row + 2, col)
            && qrcode.isDark(row + 3, col)
            && qrcode.isDark(row + 4, col)
            && !qrcode.isDark(row + 5, col)
            && qrcode.isDark(row + 6, col)) {
            lostPoint += 40;
          }
        }
      }
  
      // LEVEL4
  
      var darkCount = 0;
  
      for (var col = 0; col < moduleCount; col += 1) {
        for (var row = 0; row < moduleCount; row += 1) {
          if (qrcode.isDark(row, col)) {
            darkCount += 1;
          }
        }
      }
  
      var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
      lostPoint += ratio * 10;
  
      return lostPoint;
    };
  
    return _this;
  }();
  
  //---------------------------------------------------------------------
  // QRMath
  //---------------------------------------------------------------------
  
  var QRMath = function () {
  
    var EXP_TABLE = new Array(256);
    var LOG_TABLE = new Array(256);
  
    // initialize tables
    for (var i = 0; i < 8; i += 1) {
      EXP_TABLE[i] = 1 << i;
    }
    for (var i = 8; i < 256; i += 1) {
      EXP_TABLE[i] = EXP_TABLE[i - 4]
        ^ EXP_TABLE[i - 5]
        ^ EXP_TABLE[i - 6]
        ^ EXP_TABLE[i - 8];
    }
    for (var i = 0; i < 255; i += 1) {
      LOG_TABLE[EXP_TABLE[i]] = i;
    }
  
    var _this = {};
  
    _this.glog = function (n) {
  
      if (n < 1) {
        throw new Error('glog(' + n + ')');
      }
  
      return LOG_TABLE[n];
    };
  
    _this.gexp = function (n) {
  
      while (n < 0) {
        n += 255;
      }
  
      while (n >= 256) {
        n -= 255;
      }
  
      return EXP_TABLE[n];
    };
  
    return _this;
  }();
  
  //---------------------------------------------------------------------
  // qrPolynomial
  //---------------------------------------------------------------------
  
  function qrPolynomial(num, shift) {
  
    if (typeof num.length == 'undefined') {
      throw new Error(num.length + '/' + shift);
    }
  
    var _num = function () {
      var offset = 0;
      while (offset < num.length && num[offset] == 0) {
        offset += 1;
      }
      var _num = new Array(num.length - offset + shift);
      for (var i = 0; i < num.length - offset; i += 1) {
        _num[i] = num[i + offset];
      }
      return _num;
    }();
  
    var _this = {};
  
    _this.getAt = function (index) {
      return _num[index];
    };
  
    _this.getLength = function () {
      return _num.length;
    };
  
    _this.multiply = function (e) {
  
      var num = new Array(_this.getLength() + e.getLength() - 1);
  
      for (var i = 0; i < _this.getLength(); i += 1) {
        for (var j = 0; j < e.getLength(); j += 1) {
          num[i + j] ^= QRMath.gexp(QRMath.glog(_this.getAt(i)) + QRMath.glog(e.getAt(j)));
        }
      }
  
      return qrPolynomial(num, 0);
    };
  
    _this.mod = function (e) {
  
      if (_this.getLength() - e.getLength() < 0) {
        return _this;
      }
  
      var ratio = QRMath.glog(_this.getAt(0)) - QRMath.glog(e.getAt(0));
  
      var num = new Array(_this.getLength());
      for (var i = 0; i < _this.getLength(); i += 1) {
        num[i] = _this.getAt(i);
      }
  
      for (var i = 0; i < e.getLength(); i += 1) {
        num[i] ^= QRMath.gexp(QRMath.glog(e.getAt(i)) + ratio);
      }
  
      // recursive call
      return qrPolynomial(num, 0).mod(e);
    };
  
    return _this;
  };
  
  //---------------------------------------------------------------------
  // QRRSBlock
  //---------------------------------------------------------------------
  
  var QRRSBlock = function () {
  
  
    // [1: [L, M, Q, H], ..]
    var RS_BLOCK_TABLE = [[1, 26, 19], [1, 26, 16], [1, 26, 13], [1, 26, 9], [1, 44, 34], [1, 44, 28], [1, 44, 22], [1, 44, 16], [1, 70, 55], [1, 70, 44], [2, 35, 17], [2, 35, 13], [1, 100, 80], [2, 50, 32], [2, 50, 24], [4, 25, 9], [1, 134, 108], [2, 67, 43], [2, 33, 15, 2, 34, 16], [2, 33, 11, 2, 34, 12], [2, 86, 68], [4, 43, 27], [4, 43, 19], [4, 43, 15], [2, 98, 78], [4, 49, 31], [2, 32, 14, 4, 33, 15], [4, 39, 13, 1, 40, 14], [2, 121, 97], [2, 60, 38, 2, 61, 39], [4, 40, 18, 2, 41, 19], [4, 40, 14, 2, 41, 15], [2, 146, 116], [3, 58, 36, 2, 59, 37], [4, 36, 16, 4, 37, 17], [4, 36, 12, 4, 37, 13], [2, 86, 68, 2, 87, 69], [4, 69, 43, 1, 70, 44], [6, 43, 19, 2, 44, 20], [6, 43, 15, 2, 44, 16], [4, 101, 81], [1, 80, 50, 4, 81, 51], [4, 50, 22, 4, 51, 23], [3, 36, 12, 8, 37, 13], [2, 116, 92, 2, 117, 93], [6, 58, 36, 2, 59, 37], [4, 46, 20, 6, 47, 21], [7, 42, 14, 4, 43, 15], [4, 133, 107], [8, 59, 37, 1, 60, 38], [8, 44, 20, 4, 45, 21], [12, 33, 11, 4, 34, 12], [3, 145, 115, 1, 146, 116], [4, 64, 40, 5, 65, 41], [11, 36, 16, 5, 37, 17], [11, 36, 12, 5, 37, 13], [5, 109, 87, 1, 110, 88], [5, 65, 41, 5, 66, 42], [5, 54, 24, 7, 55, 25], [11, 36, 12], [5, 122, 98, 1, 123, 99], [7, 73, 45, 3, 74, 46], [15, 43, 19, 2, 44, 20], [3, 45, 15, 13, 46, 16], [1, 135, 107, 5, 136, 108], [10, 74, 46, 1, 75, 47], [1, 50, 22, 15, 51, 23], [2, 42, 14, 17, 43, 15], [5, 150, 120, 1, 151, 121], [9, 69, 43, 4, 70, 44], [17, 50, 22, 1, 51, 23], [2, 42, 14, 19, 43, 15], [3, 141, 113, 4, 142, 114], [3, 70, 44, 11, 71, 45], [17, 47, 21, 4, 48, 22], [9, 39, 13, 16, 40, 14], [3, 135, 107, 5, 136, 108], [3, 67, 41, 13, 68, 42], [15, 54, 24, 5, 55, 25], [15, 43, 15, 10, 44, 16], [4, 144, 116, 4, 145, 117], [17, 68, 42], [17, 50, 22, 6, 51, 23], [19, 46, 16, 6, 47, 17], [2, 139, 111, 7, 140, 112], [17, 74, 46], [7, 54, 24, 16, 55, 25], [34, 37, 13], [4, 151, 121, 5, 152, 122], [4, 75, 47, 14, 76, 48], [11, 54, 24, 14, 55, 25], [16, 45, 15, 14, 46, 16], [6, 147, 117, 4, 148, 118], [6, 73, 45, 14, 74, 46], [11, 54, 24, 16, 55, 25], [30, 46, 16, 2, 47, 17], [8, 132, 106, 4, 133, 107], [8, 75, 47, 13, 76, 48], [7, 54, 24, 22, 55, 25], [22, 45, 15, 13, 46, 16], [10, 142, 114, 2, 143, 115], [19, 74, 46, 4, 75, 47], [28, 50, 22, 6, 51, 23], [33, 46, 16, 4, 47, 17], [8, 152, 122, 4, 153, 123], [22, 73, 45, 3, 74, 46], [8, 53, 23, 26, 54, 24], [12, 45, 15, 28, 46, 16], [3, 147, 117, 10, 148, 118], [3, 73, 45, 23, 74, 46], [4, 54, 24, 31, 55, 25], [11, 45, 15, 31, 46, 16], [7, 146, 116, 7, 147, 117], [21, 73, 45, 7, 74, 46], [1, 53, 23, 37, 54, 24], [19, 45, 15, 26, 46, 16], [5, 145, 115, 10, 146, 116], [19, 75, 47, 10, 76, 48], [15, 54, 24, 25, 55, 25], [23, 45, 15, 25, 46, 16], [13, 145, 115, 3, 146, 116], [2, 74, 46, 29, 75, 47], [42, 54, 24, 1, 55, 25], [23, 45, 15, 28, 46, 16], [17, 145, 115], [10, 74, 46, 23, 75, 47], [10, 54, 24, 35, 55, 25], [19, 45, 15, 35, 46, 16], [17, 145, 115, 1, 146, 116], [14, 74, 46, 21, 75, 47], [29, 54, 24, 19, 55, 25], [11, 45, 15, 46, 46, 16], [13, 145, 115, 6, 146, 116], [14, 74, 46, 23, 75, 47], [44, 54, 24, 7, 55, 25], [59, 46, 16, 1, 47, 17], [12, 151, 121, 7, 152, 122], [12, 75, 47, 26, 76, 48], [39, 54, 24, 14, 55, 25], [22, 45, 15, 41, 46, 16], [6, 151, 121, 14, 152, 122], [6, 75, 47, 34, 76, 48], [46, 54, 24, 10, 55, 25], [2, 45, 15, 64, 46, 16], [17, 152, 122, 4, 153, 123], [29, 74, 46, 14, 75, 47], [49, 54, 24, 10, 55, 25], [24, 45, 15, 46, 46, 16], [4, 152, 122, 18, 153, 123], [13, 74, 46, 32, 75, 47], [48, 54, 24, 14, 55, 25], [42, 45, 15, 32, 46, 16], [20, 147, 117, 4, 148, 118], [40, 75, 47, 7, 76, 48], [43, 54, 24, 22, 55, 25], [10, 45, 15, 67, 46, 16], [19, 148, 118, 6, 149, 119], [18, 75, 47, 31, 76, 48], [34, 54, 24, 34, 55, 25], [20, 45, 15, 61, 46, 16]];
  
    var qrRSBlock = function (totalCount, dataCount) {
      var _this = {};
      _this.totalCount = totalCount;
      _this.dataCount = dataCount;
      return _this;
    };
  
    var _this = {};
  
    var getRsBlockTable = function (typeNumber, errorCorrectLevel) {
  
      switch (errorCorrectLevel) {
        case QRErrorCorrectLevel.L:
          return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
        case QRErrorCorrectLevel.M:
          return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
        case QRErrorCorrectLevel.Q:
          return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
        case QRErrorCorrectLevel.H:
          return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
        default:
          return undefined;
      }
    };
  
    _this.getRSBlocks = function (typeNumber, errorCorrectLevel) {
  
      var rsBlock = getRsBlockTable(typeNumber, errorCorrectLevel);
  
      if (typeof rsBlock == 'undefined') {
        throw new Error('bad rs block @ typeNumber:' + typeNumber +
          '/errorCorrectLevel:' + errorCorrectLevel);
      }
  
      var length = rsBlock.length / 3;
  
      var list = new Array();
  
      for (var i = 0; i < length; i += 1) {
  
        var count = rsBlock[i * 3 + 0];
        var totalCount = rsBlock[i * 3 + 1];
        var dataCount = rsBlock[i * 3 + 2];
  
        for (var j = 0; j < count; j += 1) {
          list.push(qrRSBlock(totalCount, dataCount));
        }
      }
  
      return list;
    };
  
    return _this;
  }();
  
  //---------------------------------------------------------------------
  // qrBitBuffer
  //---------------------------------------------------------------------
  
  var qrBitBuffer = function () {
  
    var _buffer = new Array();
    var _length = 0;
  
    var _this = {};
  
    _this.getBuffer = function () {
      return _buffer;
    };
  
    _this.getAt = function (index) {
      var bufIndex = Math.floor(index / 8);
      return ((_buffer[bufIndex] >>> (7 - index % 8)) & 1) == 1;
    };
  
    _this.put = function (num, length) {
      for (var i = 0; i < length; i += 1) {
        _this.putBit(((num >>> (length - i - 1)) & 1) == 1);
      }
    };
  
    _this.getLengthInBits = function () {
      return _length;
    };
  
    _this.putBit = function (bit) {
  
      var bufIndex = Math.floor(_length / 8);
      if (_buffer.length <= bufIndex) {
        _buffer.push(0);
      }
  
      if (bit) {
        _buffer[bufIndex] |= (0x80 >>> (_length % 8));
      }
  
      _length += 1;
    };
  
    return _this;
  };
  
  //---------------------------------------------------------------------
  // qr8BitByte
  //---------------------------------------------------------------------
  
  var qr8BitByte = function (data) {
  
    var _mode = QRMode.MODE_8BIT_BYTE;
    var _data = data;
    var _parsedData = [];
  
    var _this = {};
  
  
    // Added to support UTF-8 Characters
    for (var i = 0, l = _data.length; i < l; i++) {
      var byteArray = [];
      var code = _data.charCodeAt(i);
  
      if (code > 0x10000) {
        byteArray[0] = 0xF0 | ((code & 0x1C0000) >>> 18);
        byteArray[1] = 0x80 | ((code & 0x3F000) >>> 12);
        byteArray[2] = 0x80 | ((code & 0xFC0) >>> 6);
        byteArray[3] = 0x80 | (code & 0x3F);
      } else if (code > 0x800) {
        byteArray[0] = 0xE0 | ((code & 0xF000) >>> 12);
        byteArray[1] = 0x80 | ((code & 0xFC0) >>> 6);
        byteArray[2] = 0x80 | (code & 0x3F);
      } else if (code > 0x80) {
        byteArray[0] = 0xC0 | ((code & 0x7C0) >>> 6);
        byteArray[1] = 0x80 | (code & 0x3F);
      } else {
        byteArray[0] = code;
      }
  
      // Fix Unicode corruption bug
      _parsedData.push(byteArray);
    }
  
    _parsedData = Array.prototype.concat.apply([], _parsedData);
  
    if (_parsedData.length != _data.length) {
      _parsedData.unshift(191);
      _parsedData.unshift(187);
      _parsedData.unshift(239);
    }
  
    var _bytes = _parsedData;
  
    _this.getMode = function () {
      return _mode;
    };
  
    _this.getLength = function (buffer) {
      return _bytes.length;
    };
  
    _this.write = function (buffer) {
      for (var i = 0; i < _bytes.length; i += 1) {
        buffer.put(_bytes[i], 8);
      }
    };
  
    return _this;
  };
  
  //=====================================================================
  // GIF Support etc.
  //
  
  //---------------------------------------------------------------------
  // byteArrayOutputStream
  //---------------------------------------------------------------------
  
  var byteArrayOutputStream = function () {
  
    var _bytes = new Array();
  
    var _this = {};
  
    _this.writeByte = function (b) {
      _bytes.push(b & 0xff);
    };
  
    _this.writeShort = function (i) {
      _this.writeByte(i);
      _this.writeByte(i >>> 8);
    };
  
    _this.writeBytes = function (b, off, len) {
      off = off || 0;
      len = len || b.length;
      for (var i = 0; i < len; i += 1) {
        _this.writeByte(b[i + off]);
      }
    };
  
    _this.writeString = function (s) {
      for (var i = 0; i < s.length; i += 1) {
        _this.writeByte(s.charCodeAt(i));
      }
    };
  
    _this.toByteArray = function () {
      return _bytes;
    };
  
    _this.toString = function () {
      var s = '';
      s += '[';
      for (var i = 0; i < _bytes.length; i += 1) {
        if (i > 0) {
          s += ',';
        }
        s += _bytes[i];
      }
      s += ']';
      return s;
    };
  
    return _this;
  };
  
  //---------------------------------------------------------------------
  // base64EncodeOutputStream
  //---------------------------------------------------------------------
  
  var base64EncodeOutputStream = function () {
  
    var _buffer = 0;
    var _buflen = 0;
    var _length = 0;
    var _base64 = '';
  
    var _this = {};
  
    var writeEncoded = function (b) {
      _base64 += String.fromCharCode(encode(b & 0x3f));
    };
  
    var encode = function (n) {
      if (n < 0) {
        // error.
      } else if (n < 26) {
        return 0x41 + n;
      } else if (n < 52) {
        return 0x61 + (n - 26);
      } else if (n < 62) {
        return 0x30 + (n - 52);
      } else if (n == 62) {
        return 0x2b;
      } else if (n == 63) {
        return 0x2f;
      }
      throw new Error('n:' + n);
    };
  
    _this.writeByte = function (n) {
  
      _buffer = (_buffer << 8) | (n & 0xff);
      _buflen += 8;
      _length += 1;
  
      while (_buflen >= 6) {
        writeEncoded(_buffer >>> (_buflen - 6));
        _buflen -= 6;
      }
    };
  
    _this.flush = function () {
  
      if (_buflen > 0) {
        writeEncoded(_buffer << (6 - _buflen));
        _buffer = 0;
        _buflen = 0;
      }
  
      if (_length % 3 != 0) {
        // padding
        var padlen = 3 - _length % 3;
        for (var i = 0; i < padlen; i += 1) {
          _base64 += '=';
        }
      }
    };
  
    _this.toString = function () {
      return _base64;
    };
  
    return _this;
  };
  
  //---------------------------------------------------------------------
  // base64DecodeInputStream
  //---------------------------------------------------------------------
  
  var base64DecodeInputStream = function (str) {
  
    var _str = str;
    var _pos = 0;
    var _buffer = 0;
    var _buflen = 0;
  
    var _this = {};
  
    _this.read = function () {
  
      while (_buflen < 8) {
  
        if (_pos >= _str.length) {
          if (_buflen == 0) {
            return -1;
          }
          throw new Error('unexpected end of file./' + _buflen);
        }
  
        var c = _str.charAt(_pos);
        _pos += 1;
  
        if (c == '=') {
          _buflen = 0;
          return -1;
        } else if (c.match(/^\s$/)) {
          // ignore if whitespace.
          continue;
        }
  
        _buffer = (_buffer << 6) | decode(c.charCodeAt(0));
        _buflen += 6;
      }
  
      var n = (_buffer >>> (_buflen - 8)) & 0xff;
      _buflen -= 8;
      return n;
    };
  
    var decode = function (c) {
      if (0x41 <= c && c <= 0x5a) {
        return c - 0x41;
      } else if (0x61 <= c && c <= 0x7a) {
        return c - 0x61 + 26;
      } else if (0x30 <= c && c <= 0x39) {
        return c - 0x30 + 52;
      } else if (c == 0x2b) {
        return 62;
      } else if (c == 0x2f) {
        return 63;
      } else {
        throw new Error('c:' + c);
      }
    };
  
    return _this;
  };
  
  //---------------------------------------------------------------------
  // gifImage (B/W)
  //---------------------------------------------------------------------
  
  var gifImage = function (width, height) {
  
    var _width = width;
    var _height = height;
    var _data = new Array(width * height);
  
    var _this = {};
  
    _this.setPixel = function (x, y, pixel) {
      _data[y * _width + x] = pixel;
    };
  
    _this.write = function (out) {
  
      //---------------------------------
      // GIF Signature
  
      out.writeString('GIF87a');
  
      //---------------------------------
      // Screen Descriptor
  
      out.writeShort(_width);
      out.writeShort(_height);
  
      out.writeByte(0x80); // 2bit
      out.writeByte(0);
      out.writeByte(0);
  
      //---------------------------------
      // Global Color Map
  
      // black
      for (var i = 0; i < 3; i++) {
        out.writeByte(globalConfig.colors[i] || 0x00);
      }
  
      // white
      for (var i = 0; i < 3; i++) {
        var color = globalConfig.backgrounds[i] === 0 ? 0 : (globalConfig.backgrounds[i] || 0xff)
        out.writeByte(color);
      }
      // out.writeByte(0xff);
      // out.writeByte(0xff);
      // out.writeByte(0xff);
  
      //---------------------------------
      // Image Descriptor
  
      out.writeString(',');
      out.writeShort(0);
      out.writeShort(0);
      out.writeShort(_width);
      out.writeShort(_height);
      out.writeByte(0);
  
      //---------------------------------
      // Local Color Map
  
      //---------------------------------
      // Raster Data
  
      var lzwMinCodeSize = 2;
      var raster = getLZWRaster(lzwMinCodeSize);
  
      out.writeByte(lzwMinCodeSize);
  
      var offset = 0;
  
      while (raster.length - offset > 255) {
        out.writeByte(255);
        out.writeBytes(raster, offset, 255);
        offset += 255;
      }
  
      out.writeByte(raster.length - offset);
      out.writeBytes(raster, offset, raster.length - offset);
      out.writeByte(0x00);
  
      //---------------------------------
      // GIF Terminator
      out.writeString(';');
    };
  
    var bitOutputStream = function (out) {
  
      var _out = out;
      var _bitLength = 0;
      var _bitBuffer = 0;
  
      var _this = {};
  
      _this.write = function (data, length) {
  
        if ((data >>> length) != 0) {
          throw new Error('length over');
        }
  
        while (_bitLength + length >= 8) {
          _out.writeByte(0xff & ((data << _bitLength) | _bitBuffer));
          length -= (8 - _bitLength);
          data >>>= (8 - _bitLength);
          _bitBuffer = 0;
          _bitLength = 0;
        }
  
        _bitBuffer = (data << _bitLength) | _bitBuffer;
        _bitLength = _bitLength + length;
      };
  
      _this.flush = function () {
        if (_bitLength > 0) {
          _out.writeByte(_bitBuffer);
        }
      };
  
      return _this;
    };
  
    var getLZWRaster = function (lzwMinCodeSize) {
  
      var clearCode = 1 << lzwMinCodeSize;
      var endCode = (1 << lzwMinCodeSize) + 1;
      var bitLength = lzwMinCodeSize + 1;
  
      // Setup LZWTable
      var table = lzwTable();
  
      for (var i = 0; i < clearCode; i += 1) {
        table.add(String.fromCharCode(i));
      }
      table.add(String.fromCharCode(clearCode));
      table.add(String.fromCharCode(endCode));
  
      var byteOut = byteArrayOutputStream();
      var bitOut = bitOutputStream(byteOut);
  
      // clear code
      bitOut.write(clearCode, bitLength);
  
      var dataIndex = 0;
  
      var s = String.fromCharCode(_data[dataIndex]);
      dataIndex += 1;
  
      while (dataIndex < _data.length) {
  
        var c = String.fromCharCode(_data[dataIndex]);
        dataIndex += 1;
  
        if (table.contains(s + c)) {
  
          s = s + c;
  
        } else {
  
          bitOut.write(table.indexOf(s), bitLength);
  
          if (table.size() < 0xfff) {
  
            if (table.size() == (1 << bitLength)) {
              bitLength += 1;
            }
  
            table.add(s + c);
          }
  
          s = c;
        }
      }
  
      bitOut.write(table.indexOf(s), bitLength);
  
      // end code
      bitOut.write(endCode, bitLength);
  
      bitOut.flush();
  
      return byteOut.toByteArray();
    };
  
    var lzwTable = function () {
  
      var _map = {};
      var _size = 0;
  
      var _this = {};
  
      _this.add = function (key) {
        if (_this.contains(key)) {
          throw new Error('dup key:' + key);
        }
        _map[key] = _size;
        _size += 1;
      };
  
      _this.size = function () {
        return _size;
      };
  
      _this.indexOf = function (key) {
        return _map[key];
      };
  
      _this.contains = function (key) {
        return typeof _map[key] != 'undefined';
      };
  
      return _this;
    };
  
    return _this;
  };
  
  var createImgTag = function (width, height, getPixel, alt) {
  
    var gif = gifImage(width, height);
    for (var y = 0; y < height; y += 1) {
      for (var x = 0; x < width; x += 1) {
        gif.setPixel(x, y, getPixel(x, y));
      }
    }
  
    var b = byteArrayOutputStream();
    gif.write(b);
  
    var base64 = base64EncodeOutputStream();
    var bytes = b.toByteArray();
    for (var i = 0; i < bytes.length; i += 1) {
      base64.writeByte(bytes[i]);
    }
    base64.flush();
  
    var img = '';
    img += 'data:image/png;base64,';
    img += base64;
  
    return img;
  };
  
  var color2hexs = function (colorString) {
    var color = [], rgb = [], hex;
    if (colorString.startsWith('#')) {
      hex = colorString.replace(/#/, "");
      if (hex.length == 3) { // 处理 "#abc" 成 "#aabbcc"
        var tmp = [];
        for (var i = 0; i < 3; i++) {
          tmp.push(hex.charAt(i) + hex.charAt(i));
        }
        hex = tmp.join("");
      }
  
      for (var i = 0; i < 3; i++) {
        color[i] = "0x" + hex.substr(i * 2, 2);
        rgb.push(parseInt(Number(color[i])));
      }
    } else if (colorString.startsWith('rgb')) {
      rgb = colorString.toString().match(/\d+/g);
    }
    return rgb;
  }
  //---------------------------------------------------------------------
  // returns qrcode function.
  
  var drawImg = function (text, options) {
    options = options || {};
    var typeNumber = options.version || 4;
    var errorCorrectLevel = options.errorCorrectLevel || 'M';
    var size = options.size || 500;
    globalConfig.colors = color2hexs(options.color || '#000')
    globalConfig.backgrounds = color2hexs(options.background || '#fff')
    var padding = options.padding || 0
    var qr;
  
    try {
      qr = qrcode(typeNumber, errorCorrectLevel || 'M');
      qr.addData(text);
      qr.make();
    } catch (e) {
      if (typeNumber >= 40) {
        throw new Error('Text too long to encode');
      } else {
        return drawImg(text, {
          size: size,
          errorCorrectLevel: errorCorrectLevel,
          version: typeNumber + 1,
          color: options.color,
          background: options.background,
          padding: options.padding
        });
      }
    }
  
    // calc cellsize and margin
    var cellsize = ((size) / (qr.getModuleCount() + 2 * padding));
    return qr.createImgTag(cellsize, padding * cellsize, size);
  };
  module.exports = {
    drawImg: drawImg
  };