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/home/develito/public_html/media/plg_twofactorauth_totp/js/qrcode.js

//---------------------------------------------------------------------
//
// QR Code Generator for JavaScript
//
// Copyright (c) 2009 Kazuhiko Arase
//
// URL: http://www.d-project.com/
//
// Licensed under the MIT license:
//  http://www.opensource.org/licenses/mit-license.php
//
// The word 'QR Code' is registered trademark of
// DENSO WAVE INCORPORATED
//  http://www.denso-wave.com/qrcode/faqpatent-e.html
//
//---------------------------------------------------------------------

var qrcode = function() {

//---------------------------------------------------------------------
  // qrcode
  //---------------------------------------------------------------------

/**
   * qrcode
   * @param typeNumber 1 to 40
   * @param errorCorrectionLevel 'L','M','Q','H'
   */
  var qrcode = function(typeNumber, errorCorrectionLevel) {

var PAD0 = 0xEC;
    var PAD1 = 0x11;

var _typeNumber = typeNumber;
    var _errorCorrectionLevel = QRErrorCorrectionLevel[errorCorrectionLevel];
    var _modules = null;
    var _moduleCount = 0;
    var _dataCache = null;
    var _dataList = [];

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, _errorCorrectionLevel, _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 = (_errorCorrectionLevel << 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, errorCorrectionLevel, dataList) {

var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectionLevel);

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 '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, mode) {

mode = mode || 'Byte';

var newData = null;

switch(mode) {
      case 'Numeric' :
        newData = qrNumber(data);
        break;
      case 'Alphanumeric' :
        newData = qrAlphaNum(data);
        break;
      case 'Byte' :
        newData = qr8BitByte(data);
        break;
      case 'Kanji' :
        newData = qrKanji(data);
        break;
      default :
        throw 'mode:' + mode;
      }

_dataList.push(newData);
      _dataCache = null;
    };

_this.isDark = function(row, col) {
      if (row < 0 || _moduleCount <= row || col < 0 || _moduleCount <= col) {
        throw row + ',' + col;
      }
      return _modules[row][col];
    };

_this.getModuleCount = function() {
      return _moduleCount;
    };

_this.make = function() {
      if (_typeNumber < 1) {
        var typeNumber = 1;

for (; typeNumber < 40; typeNumber++) {
          var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, _errorCorrectionLevel);
          var buffer = qrBitBuffer();

for (var i = 0; i < _dataList.length; i++) {
            var data = _dataList[i];
            buffer.put(data.getMode(), 4);
            buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber) );
            data.write(buffer);
          }

var totalDataCount = 0;
          for (var i = 0; i < rsBlocks.length; i++) {
            totalDataCount += rsBlocks[i].dataCount;
          }

if (buffer.getLengthInBits() <= totalDataCount * 8) {
            break;
          }
        }

_typeNumber = typeNumber;
      }

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.createSvgTag = function(cellSize, margin) {

var opts = {};
      if (typeof arguments[0] == 'object') {
        // Called by options.
        opts = arguments[0];
        // overwrite cellSize and margin.
        cellSize = opts.cellSize;
        margin = opts.margin;
      }

cellSize = cellSize || 2;
      margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
      var size = _this.getModuleCount() * cellSize + margin * 2;
      var c, mc, r, mr, qrSvg='', rect;

rect = 'l' + cellSize + ',0 0,' + cellSize +
        ' -' + cellSize + ',0 0,-' + cellSize + 'z ';

qrSvg += '<svg version="1.1" xmlns="http://www.w3.org/2000/svg"';
      qrSvg += !opts.scalable ? ' width="' + size + 'px" height="' + size + 'px"' : '';
      qrSvg += ' viewBox="0 0 ' + size + ' ' + size + '" ';
      qrSvg += ' preserveAspectRatio="xMinYMin meet">';
      qrSvg += '<rect width="100%" height="100%" fill="white" cx="0" cy="0"/>';
      qrSvg += '<path d="';

for (r = 0; r < _this.getModuleCount(); r += 1) {
        mr = r * cellSize + margin;
        for (c = 0; c < _this.getModuleCount(); c += 1) {
          if (_this.isDark(r, c) ) {
            mc = c*cellSize+margin;
            qrSvg += 'M' + mc + ',' + mr + rect;
          }
        }
      }

qrSvg += '" stroke="transparent" fill="black"/>';
      qrSvg += '</svg>';

return qrSvg;
    };

_this.createDataURL = function(cellSize, margin) {

cellSize = cellSize || 2;
      margin = (typeof margin == 'undefined')? cellSize * 4 : margin;

var size = _this.getModuleCount() * cellSize + margin * 2;
      var min = margin;
      var max = size - margin;

return createDataURL(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;
        }
      } );
    };

_this.createImgTag = function(cellSize, margin, alt) {

cellSize = cellSize || 2;
      margin = (typeof margin == 'undefined')? cellSize * 4 : margin;

var size = _this.getModuleCount() * cellSize + margin * 2;

var img = '';
      img += '<img';
      img += '\u0020src="';
      img += _this.createDataURL(cellSize, margin);
      img += '"';
      img += '\u0020width="';
      img += size;
      img += '"';
      img += '\u0020height="';
      img += size;
      img += '"';
      if (alt) {
        img += '\u0020alt="';
        img += alt;
        img += '"';
      }
      img += '/>';

return img;
    };

var _createHalfASCII = function(margin) {
      var cellSize = 1;
      margin = (typeof margin == 'undefined')? cellSize * 2 : margin;

var size = _this.getModuleCount() * cellSize + margin * 2;
      var min = margin;
      var max = size - margin;

var y, x, r1, r2, p;

var blocks = {
        '██': '█',
        '█ ': '▀',
        ' █': '▄',
        '  ': ' '
      };

var blocksLastLineNoMargin = {
        '██': '▀',
        '█ ': '▀',
        ' █': ' ',
        '  ': ' '
      };

var ascii = '';
      for (y = 0; y < size; y += 2) {
        r1 = Math.floor((y - min) / cellSize);
        r2 = Math.floor((y + 1 - min) / cellSize);
        for (x = 0; x < size; x += 1) {
          p = '█';

if (min <= x && x < max && min <= y && y < max && _this.isDark(r1, Math.floor((x - min) / cellSize))) {
            p = ' ';
          }

if (min <= x && x < max && min <= y+1 && y+1 < max && _this.isDark(r2, Math.floor((x - min) / cellSize))) {
            p += ' ';
          }
          else {
            p += '█';
          }

// Output 2 characters per pixel, to create full square. 1 character per pixels gives only half width of square.
          ascii += (margin < 1 && y+1 >= max) ? blocksLastLineNoMargin[p] : blocks[p];
        }

ascii += '\n';
      }

if (size % 2 && margin > 0) {
        return ascii.substring(0, ascii.length - size - 1) + Array(size+1).join('▀');
      }

return ascii.substring(0, ascii.length-1);
    };

_this.createASCII = function(cellSize, margin) {
      cellSize = cellSize || 1;

if (cellSize < 2) {
        return _createHalfASCII(margin);
      }

cellSize -= 1;
      margin = (typeof margin == 'undefined')? cellSize * 2 : margin;

var size = _this.getModuleCount() * cellSize + margin * 2;
      var min = margin;
      var max = size - margin;

var y, x, r, p;

var white = Array(cellSize+1).join('██');
      var black = Array(cellSize+1).join('  ');

var ascii = '';
      var line = '';
      for (y = 0; y < size; y += 1) {
        r = Math.floor( (y - min) / cellSize);
        line = '';
        for (x = 0; x < size; x += 1) {
          p = 1;

if (min <= x && x < max && min <= y && y < max && _this.isDark(r, Math.floor((x - min) / cellSize))) {
            p = 0;
          }

// Output 2 characters per pixel, to create full square. 1 character per pixels gives only half width of square.
          line += p ? white : black;
        }

for (r = 0; r < cellSize; r += 1) {
          ascii += line + '\n';
        }
      }

return ascii.substring(0, ascii.length-1);
    };

_this.renderTo2dContext = function(context, cellSize) {
      cellSize = cellSize || 2;
      var length = _this.getModuleCount();
      for (var row = 0; row < length; row++) {
        for (var col = 0; col < length; col++) {
          context.fillStyle = _this.isDark(row, col) ? 'black' : 'white';
          context.fillRect(row * cellSize, col * cellSize, cellSize, cellSize);
        }
      }
    }

return _this;
  };

//---------------------------------------------------------------------
  // qrcode.stringToBytes
  //---------------------------------------------------------------------

qrcode.stringToBytesFuncs = {
    'default' : function(s) {
      var bytes = [];
      for (var i = 0; i < s.length; i += 1) {
        var c = s.charCodeAt(i);
        bytes.push(c & 0xff);
      }
      return bytes;
    }
  };

qrcode.stringToBytes = qrcode.stringToBytesFuncs['default'];

//---------------------------------------------------------------------
  // 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 'eof';
        return b;
      };

return unicodeMap;
    }();

var unknownChar = '?'.charCodeAt(0);

return function(s) {
      var bytes = [];
      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
  };

//---------------------------------------------------------------------
  // QRErrorCorrectionLevel
  //---------------------------------------------------------------------

var QRErrorCorrectionLevel = {
    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 '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 '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 '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 'mode:' + mode;
        }

} else {
        throw '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 '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 num.length + '/' + shift;
    }

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() {

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, 7, 37, 13],

// 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]
    ];

var qrRSBlock = function(totalCount, dataCount) {
      var _this = {};
      _this.totalCount = totalCount;
      _this.dataCount = dataCount;
      return _this;
    };

var _this = {};

var getRsBlockTable = function(typeNumber, errorCorrectionLevel) {

switch(errorCorrectionLevel) {
      case QRErrorCorrectionLevel.L :
        return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
      case QRErrorCorrectionLevel.M :
        return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
      case QRErrorCorrectionLevel.Q :
        return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
      case QRErrorCorrectionLevel.H :
        return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
      default :
        return undefined;
      }
    };

_this.getRSBlocks = function(typeNumber, errorCorrectionLevel) {

var rsBlock = getRsBlockTable(typeNumber, errorCorrectionLevel);

if (typeof rsBlock == 'undefined') {
        throw 'bad rs block @ typeNumber:' + typeNumber +
            '/errorCorrectionLevel:' + errorCorrectionLevel;
      }

var length = rsBlock.length / 3;

var list = [];

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 = [];
    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;
  };

//---------------------------------------------------------------------
  // qrNumber
  //---------------------------------------------------------------------

var qrNumber = function(data) {

var _mode = QRMode.MODE_NUMBER;
    var _data = data;

var _this = {};

_this.getMode = function() {
      return _mode;
    };

_this.getLength = function(buffer) {
      return _data.length;
    };

_this.write = function(buffer) {

var data = _data;

var i = 0;

while (i + 2 < data.length) {
        buffer.put(strToNum(data.substring(i, i + 3) ), 10);
        i += 3;
      }

if (i < data.length) {
        if (data.length - i == 1) {
          buffer.put(strToNum(data.substring(i, i + 1) ), 4);
        } else if (data.length - i == 2) {
          buffer.put(strToNum(data.substring(i, i + 2) ), 7);
        }
      }
    };

var strToNum = function(s) {
      var num = 0;
      for (var i = 0; i < s.length; i += 1) {
        num = num * 10 + chatToNum(s.charAt(i) );
      }
      return num;
    };

var chatToNum = function(c) {
      if ('0' <= c && c <= '9') {
        return c.charCodeAt(0) - '0'.charCodeAt(0);
      }
      throw 'illegal char :' + c;
    };

return _this;
  };

//---------------------------------------------------------------------
  // qrAlphaNum
  //---------------------------------------------------------------------

var qrAlphaNum = function(data) {

var _mode = QRMode.MODE_ALPHA_NUM;
    var _data = data;

var _this = {};

_this.getMode = function() {
      return _mode;
    };

_this.getLength = function(buffer) {
      return _data.length;
    };

_this.write = function(buffer) {

var s = _data;

var i = 0;

while (i + 1 < s.length) {
        buffer.put(
          getCode(s.charAt(i) ) * 45 +
          getCode(s.charAt(i + 1) ), 11);
        i += 2;
      }

if (i < s.length) {
        buffer.put(getCode(s.charAt(i) ), 6);
      }
    };

var getCode = function(c) {

if ('0' <= c && c <= '9') {
        return c.charCodeAt(0) - '0'.charCodeAt(0);
      } else if ('A' <= c && c <= 'Z') {
        return c.charCodeAt(0) - 'A'.charCodeAt(0) + 10;
      } else {
        switch (c) {
        case ' ' : return 36;
        case '$' : return 37;
        case '%' : return 38;
        case '*' : return 39;
        case '+' : return 40;
        case '-' : return 41;
        case '.' : return 42;
        case '/' : return 43;
        case ':' : return 44;
        default :
          throw 'illegal char :' + c;
        }
      }
    };

return _this;
  };

//---------------------------------------------------------------------
  // qr8BitByte
  //---------------------------------------------------------------------

var qr8BitByte = function(data) {

var _mode = QRMode.MODE_8BIT_BYTE;
    var _data = data;
    var _bytes = qrcode.stringToBytes(data);

var _this = {};

_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;
  };

//---------------------------------------------------------------------
  // qrKanji
  //---------------------------------------------------------------------

var qrKanji = function(data) {

var _mode = QRMode.MODE_KANJI;
    var _data = data;

var _bytes = stringToBytes(data);

var _this = {};

_this.getMode = function() {
      return _mode;
    };

_this.getLength = function(buffer) {
      return ~~(_bytes.length / 2);
    };

_this.write = function(buffer) {

var data = _bytes;

var i = 0;

while (i + 1 < data.length) {

var c = ( (0xff & data[i]) << 8) | (0xff & data[i + 1]);

if (0x8140 <= c && c <= 0x9FFC) {
          c -= 0x8140;
        } else if (0xE040 <= c && c <= 0xEBBF) {
          c -= 0xC140;
        } else {
          throw 'illegal char at ' + (i + 1) + '/' + c;
        }

c = ( (c >>> 8) & 0xff) * 0xC0 + (c & 0xff);

buffer.put(c, 13);

i += 2;
      }

if (i < data.length) {
        throw 'illegal char at ' + (i + 1);
      }
    };

return _this;
  };

//=====================================================================
  // GIF Support etc.
  //

//---------------------------------------------------------------------
  // byteArrayOutputStream
  //---------------------------------------------------------------------

var byteArrayOutputStream = function() {

var _bytes = [];

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) );
    };

_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 '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;
    };

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
      out.writeByte(0x00);
      out.writeByte(0x00);
      out.writeByte(0x00);

// white
      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 '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 '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 createDataURL = function(width, height, getPixel) {
    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();

return 'data:image/gif;base64,' + base64;
  };

//---------------------------------------------------------------------
  // returns qrcode function.

return qrcode;
}();

// multibyte support
!function() {

qrcode.stringToBytesFuncs['UTF-8'] = function(s) {
    // http://stackoverflow.com/questions/18729405/how-to-convert-utf8-string-to-byte-array
    function toUTF8Array(str) {
      var utf8 = [];
      for (var i=0; i < str.length; i++) {
        var charcode = str.charCodeAt(i);
        if (charcode < 0x80) utf8.push(charcode);
        else if (charcode < 0x800) {
          utf8.push(0xc0 | (charcode >> 6),
              0x80 | (charcode & 0x3f));
        }
        else if (charcode < 0xd800 || charcode >= 0xe000) {
          utf8.push(0xe0 | (charcode >> 12),
              0x80 | ((charcode>>6) & 0x3f),
              0x80 | (charcode & 0x3f));
        }
        // surrogate pair
        else {
          i++;
          // UTF-16 encodes 0x10000-0x10FFFF by
          // subtracting 0x10000 and splitting the
          // 20 bits of 0x0-0xFFFFF into two halves
          charcode = 0x10000 + (((charcode & 0x3ff)<<10)
            | (str.charCodeAt(i) & 0x3ff));
          utf8.push(0xf0 | (charcode >>18),
              0x80 | ((charcode>>12) & 0x3f),
              0x80 | ((charcode>>6) & 0x3f),
              0x80 | (charcode & 0x3f));
        }
      }
      return utf8;
    }
    return toUTF8Array(s);
  };

}();