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, alt, title) {
  
		var opts = {};
		if (typeof arguments[0] == 'object') {
		  // Called by options.
		  opts = arguments[0];
		  // overwrite cellSize and margin.
		  cellSize = opts.cellSize;
		  margin = opts.margin;
		  alt = opts.alt;
		  title = opts.title;
		}
  
		cellSize = cellSize || 2;
		margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
  
		// Compose alt property surrogate
		alt = (typeof alt === 'string') ? {text: alt} : alt || {};
		alt.text = alt.text || null;
		alt.id = (alt.text) ? alt.id || 'qrcode-description' : null;
  
		// Compose title property surrogate
		title = (typeof title === 'string') ? {text: title} : title || {};
		title.text = title.text || null;
		title.id = (title.text) ? title.id || 'qrcode-title' : null;
  
		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 += (title.text || alt.text) ? ' role="img" aria-labelledby="' +
			escapeXml([title.id, alt.id].join(' ').trim() ) + '"' : '';
		qrSvg += '>';
		qrSvg += (title.text) ? '<title id="' + escapeXml(title.id) + '">' +
			escapeXml(title.text) + '</title>' : '';
		qrSvg += (alt.text) ? '<description id="' + escapeXml(alt.id) + '">' +
			escapeXml(alt.text) + '</description>' : '';
		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 += escapeXml(alt);
		  img += '"';
		}
		img += '/>';
  
		return img;
	  };
  
	  var escapeXml = function(s) {
		var escaped = '';
		for (var i = 0; i < s.length; i += 1) {
		  var c = s.charAt(i);
		  switch(c) {
		  case '<': escaped += '&lt;'; break;
		  case '>': escaped += '&gt;'; break;
		  case '&': escaped += '&amp;'; break;
		  case '"': escaped += '&quot;'; break;
		  default : escaped += c; break;
		  }
		}
		return escaped;
	  };
  
	  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;
		};
  
		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 count + ' != ' + numChars;
		}
  
		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 _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() {
  
	  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 stringToBytes = qrcode.stringToBytesFuncs['SJIS'];
	  if (!stringToBytes) {
		throw 'sjis not supported.';
	  }
	  !function(c, code) {
		// self test for sjis support.
		var test = stringToBytes(c);
		if (test.length != 2 || ( (test[0] << 8) | test[1]) != code) {
		  throw 'sjis not supported.';
		}
	  }('\u53cb', 0x9746);
  
	  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) );
	  };
  
	  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 '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 '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 '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
		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);
	};
  
  }();
  
  (function (factory) {
	if (typeof define === 'function' && define.amd) {
		define([], factory);
	} else if (typeof exports === 'object') {
		module.exports = factory();
	}
  }(function () {
	  return qrcode;
  }));