diff --git a/utils/util.js b/utils/util.js
new file mode 100644
index 0000000..dbadbb8
--- /dev/null
+++ b/utils/util.js
@@ -0,0 +1,19 @@
+const formatTime = date => {
+  const year = date.getFullYear()
+  const month = date.getMonth() + 1
+  const day = date.getDate()
+  const hour = date.getHours()
+  const minute = date.getMinutes()
+  const second = date.getSeconds()
+
+  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
+}
+
+const formatNumber = n => {
+  n = n.toString()
+  return n[1] ? n : '0' + n
+}
+
+module.exports = {
+  formatTime: formatTime
+}
diff --git a/utils/weapp-qrcode.js b/utils/weapp-qrcode.js
new file mode 100644
index 0000000..638cb0c
--- /dev/null
+++ b/utils/weapp-qrcode.js
@@ -0,0 +1,1625 @@
+//---------------------------------------------------------------------
+//
+// 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
+//
+//---------------------------------------------------------------------
+
+//---------------微信小程序基于base64生成二维码插件修改-------------------
+/*
+ * @Modified: Pudon
+ * @demoURL: https://github.com/Pudon/weapp-qrcode
+ * @Date: 2018-09-11 14:00:05 
+ * @Last Modified by: Pudon
+ * @Last Modified time: 2018-09-12 16:33:19
+ */
+//---------------------------------------------------------------------
+
+/**
+ * qrcode
+ * @param typeNumber 1 to 40
+ * @param errorCorrectLevel 'L','M','Q','H'
+ */
+var qrcode = function(typeNumber, errorCorrectLevel) {
+
+    var PAD0 = 0xEC;
+    var PAD1 = 0x11;
+
+    var _typeNumber = typeNumber;
+    var _errorCorrectLevel = QRErrorCorrectLevel[errorCorrectLevel];
+    var _modules = null;
+    var _moduleCount = 0;
+    var _dataCache = null;
+    var _dataList = new Array();
+
+    var _this = {};
+
+    var makeImpl = function(test, maskPattern) {
+
+	_moduleCount = _typeNumber * 4 + 17;
+	_modules = function(moduleCount) {
+	    var modules = new Array(moduleCount);
+	    for (var row = 0; row < moduleCount; row += 1) {
+		modules[row] = new Array(moduleCount);
+		for (var col = 0; col < moduleCount; col += 1) {
+		    modules[row][col] = null;
+		}
+	    }
+	    return modules;
+	}(_moduleCount);
+
+	setupPositionProbePattern(0, 0);
+	setupPositionProbePattern(_moduleCount - 7, 0);
+	setupPositionProbePattern(0, _moduleCount - 7);
+	setupPositionAdjustPattern();
+	setupTimingPattern();
+	setupTypeInfo(test, maskPattern);
+
+	if (_typeNumber >= 7) {
+	    setupTypeNumber(test);
+	}
+
+	if (_dataCache == null) {
+	    _dataCache = createData(_typeNumber, _errorCorrectLevel, _dataList);
+	}
+
+	mapData(_dataCache, maskPattern);
+    };
+
+    var setupPositionProbePattern = function(row, col) {
+
+	for (var r = -1; r <= 7; r += 1) {
+
+	    if (row + r <= -1 || _moduleCount <= row + r) continue;
+
+	    for (var c = -1; c <= 7; c += 1) {
+
+		if (col + c <= -1 || _moduleCount <= col + c) continue;
+
+		if ( (0 <= r && r <= 6 && (c == 0 || c == 6) )
+		     || (0 <= c && c <= 6 && (r == 0 || r == 6) )
+		     || (2 <= r && r <= 4 && 2 <= c && c <= 4) ) {
+		    _modules[row + r][col + c] = true;
+		} else {
+		    _modules[row + r][col + c] = false;
+		}
+	    }
+	}
+    };
+
+    var getBestMaskPattern = function() {
+
+	var minLostPoint = 0;
+	var pattern = 0;
+
+	for (var i = 0; i < 8; i += 1) {
+
+	    makeImpl(true, i);
+
+	    var lostPoint = QRUtil.getLostPoint(_this);
+
+	    if (i == 0 || minLostPoint > lostPoint) {
+		minLostPoint = lostPoint;
+		pattern = i;
+	    }
+	}
+
+	return pattern;
+    };
+
+    var setupTimingPattern = function() {
+
+	for (var r = 8; r < _moduleCount - 8; r += 1) {
+	    if (_modules[r][6] != null) {
+		continue;
+	    }
+	    _modules[r][6] = (r % 2 == 0);
+	}
+
+	for (var c = 8; c < _moduleCount - 8; c += 1) {
+	    if (_modules[6][c] != null) {
+		continue;
+	    }
+	    _modules[6][c] = (c % 2 == 0);
+	}
+    };
+
+    var setupPositionAdjustPattern = function() {
+
+	var pos = QRUtil.getPatternPosition(_typeNumber);
+
+	for (var i = 0; i < pos.length; i += 1) {
+
+	    for (var j = 0; j < pos.length; j += 1) {
+
+		var row = pos[i];
+		var col = pos[j];
+
+		if (_modules[row][col] != null) {
+		    continue;
+		}
+
+		for (var r = -2; r <= 2; r += 1) {
+
+		    for (var c = -2; c <= 2; c += 1) {
+
+			if (r == -2 || r == 2 || c == -2 || c == 2
+			    || (r == 0 && c == 0) ) {
+			    _modules[row + r][col + c] = true;
+			} else {
+			    _modules[row + r][col + c] = false;
+			}
+		    }
+		}
+	    }
+	}
+    };
+
+    var setupTypeNumber = function(test) {
+
+	var bits = QRUtil.getBCHTypeNumber(_typeNumber);
+
+	for (var i = 0; i < 18; i += 1) {
+	    var mod = (!test && ( (bits >> i) & 1) == 1);
+	    _modules[Math.floor(i / 3)][i % 3 + _moduleCount - 8 - 3] = mod;
+	}
+
+	for (var i = 0; i < 18; i += 1) {
+	    var mod = (!test && ( (bits >> i) & 1) == 1);
+	    _modules[i % 3 + _moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
+	}
+    };
+
+    var setupTypeInfo = function(test, maskPattern) {
+
+	var data = (_errorCorrectLevel << 3) | maskPattern;
+	var bits = QRUtil.getBCHTypeInfo(data);
+
+	// vertical
+	for (var i = 0; i < 15; i += 1) {
+
+	    var mod = (!test && ( (bits >> i) & 1) == 1);
+
+	    if (i < 6) {
+		_modules[i][8] = mod;
+	    } else if (i < 8) {
+		_modules[i + 1][8] = mod;
+	    } else {
+		_modules[_moduleCount - 15 + i][8] = mod;
+	    }
+	}
+
+	// horizontal
+	for (var i = 0; i < 15; i += 1) {
+
+	    var mod = (!test && ( (bits >> i) & 1) == 1);
+
+	    if (i < 8) {
+		_modules[8][_moduleCount - i - 1] = mod;
+	    } else if (i < 9) {
+		_modules[8][15 - i - 1 + 1] = mod;
+	    } else {
+		_modules[8][15 - i - 1] = mod;
+	    }
+	}
+
+	// fixed module
+	_modules[_moduleCount - 8][8] = (!test);
+    };
+
+    var mapData = function(data, maskPattern) {
+
+	var inc = -1;
+	var row = _moduleCount - 1;
+	var bitIndex = 7;
+	var byteIndex = 0;
+	var maskFunc = QRUtil.getMaskFunction(maskPattern);
+
+	for (var col = _moduleCount - 1; col > 0; col -= 2) {
+
+	    if (col == 6) col -= 1;
+
+	    while (true) {
+
+		for (var c = 0; c < 2; c += 1) {
+
+		    if (_modules[row][col - c] == null) {
+
+			var dark = false;
+
+			if (byteIndex < data.length) {
+			    dark = ( ( (data[byteIndex] >>> bitIndex) & 1) == 1);
+			}
+
+			var mask = maskFunc(row, col - c);
+
+			if (mask) {
+			    dark = !dark;
+			}
+
+			_modules[row][col - c] = dark;
+			bitIndex -= 1;
+
+			if (bitIndex == -1) {
+			    byteIndex += 1;
+			    bitIndex = 7;
+			}
+		    }
+		}
+
+		row += inc;
+
+		if (row < 0 || _moduleCount <= row) {
+		    row -= inc;
+		    inc = -inc;
+		    break;
+		}
+	    }
+	}
+    };
+
+    var createBytes = function(buffer, rsBlocks) {
+
+	var offset = 0;
+
+	var maxDcCount = 0;
+	var maxEcCount = 0;
+
+	var dcdata = new Array(rsBlocks.length);
+	var ecdata = new Array(rsBlocks.length);
+
+	for (var r = 0; r < rsBlocks.length; r += 1) {
+
+	    var dcCount = rsBlocks[r].dataCount;
+	    var ecCount = rsBlocks[r].totalCount - dcCount;
+
+	    maxDcCount = Math.max(maxDcCount, dcCount);
+	    maxEcCount = Math.max(maxEcCount, ecCount);
+
+	    dcdata[r] = new Array(dcCount);
+
+	    for (var i = 0; i < dcdata[r].length; i += 1) {
+		dcdata[r][i] = 0xff & buffer.getBuffer()[i + offset];
+	    }
+	    offset += dcCount;
+
+	    var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
+	    var rawPoly = qrPolynomial(dcdata[r], rsPoly.getLength() - 1);
+
+	    var modPoly = rawPoly.mod(rsPoly);
+	    ecdata[r] = new Array(rsPoly.getLength() - 1);
+	    for (var i = 0; i < ecdata[r].length; i += 1) {
+		var modIndex = i + modPoly.getLength() - ecdata[r].length;
+		ecdata[r][i] = (modIndex >= 0)? modPoly.getAt(modIndex) : 0;
+	    }
+	}
+
+	var totalCodeCount = 0;
+	for (var i = 0; i < rsBlocks.length; i += 1) {
+	    totalCodeCount += rsBlocks[i].totalCount;
+	}
+
+	var data = new Array(totalCodeCount);
+	var index = 0;
+
+	for (var i = 0; i < maxDcCount; i += 1) {
+	    for (var r = 0; r < rsBlocks.length; r += 1) {
+		if (i < dcdata[r].length) {
+		    data[index] = dcdata[r][i];
+		    index += 1;
+		}
+	    }
+	}
+
+	for (var i = 0; i < maxEcCount; i += 1) {
+	    for (var r = 0; r < rsBlocks.length; r += 1) {
+		if (i < ecdata[r].length) {
+		    data[index] = ecdata[r][i];
+		    index += 1;
+		}
+	    }
+	}
+
+	return data;
+    };
+
+    var createData = function(typeNumber, errorCorrectLevel, dataList) {
+
+	var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);
+
+	var buffer = qrBitBuffer();
+
+	for (var i = 0; i < dataList.length; i += 1) {
+	    var data = dataList[i];
+	    buffer.put(data.getMode(), 4);
+	    buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber) );
+	    data.write(buffer);
+	}
+
+	// calc num max data.
+	var totalDataCount = 0;
+	for (var i = 0; i < rsBlocks.length; i += 1) {
+	    totalDataCount += rsBlocks[i].dataCount;
+	}
+
+	if (buffer.getLengthInBits() > totalDataCount * 8) {
+	    throw new Error('code length overflow. ('
+			    + buffer.getLengthInBits()
+			    + '>'
+			    + totalDataCount * 8
+			    + ')');
+	}
+
+	// end code
+	if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
+	    buffer.put(0, 4);
+	}
+
+	// padding
+	while (buffer.getLengthInBits() % 8 != 0) {
+	    buffer.putBit(false);
+	}
+
+	// padding
+	while (true) {
+
+	    if (buffer.getLengthInBits() >= totalDataCount * 8) {
+		break;
+	    }
+	    buffer.put(PAD0, 8);
+
+	    if (buffer.getLengthInBits() >= totalDataCount * 8) {
+		break;
+	    }
+	    buffer.put(PAD1, 8);
+	}
+
+	return createBytes(buffer, rsBlocks);
+    };
+
+    _this.addData = function(data) {
+	var newData = qr8BitByte(data);
+	_dataList.push(newData);
+	_dataCache = null;
+    };
+
+    _this.isDark = function(row, col) {
+	if (row < 0 || _moduleCount <= row || col < 0 || _moduleCount <= col) {
+	    throw new Error(row + ',' + col);
+	}
+	return _modules[row][col];
+    };
+
+    _this.getModuleCount = function() {
+	return _moduleCount;
+    };
+
+    _this.make = function() {
+	makeImpl(false, getBestMaskPattern() );
+    };
+
+    _this.createTableTag = function(cellSize, margin) {
+
+	cellSize = cellSize || 2;
+	margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
+
+	var qrHtml = '';
+
+	qrHtml += '<table style="';
+	qrHtml += ' border-width: 0px; border-style: none;';
+	qrHtml += ' border-collapse: collapse;';
+	qrHtml += ' padding: 0px; margin: ' + margin + 'px;';
+	qrHtml += '">';
+	qrHtml += '<tbody>';
+
+	for (var r = 0; r < _this.getModuleCount(); r += 1) {
+
+	    qrHtml += '<tr>';
+
+	    for (var c = 0; c < _this.getModuleCount(); c += 1) {
+		qrHtml += '<td style="';
+		qrHtml += ' border-width: 0px; border-style: none;';
+		qrHtml += ' border-collapse: collapse;';
+		qrHtml += ' padding: 0px; margin: 0px;';
+		qrHtml += ' width: ' + cellSize + 'px;';
+		qrHtml += ' height: ' + cellSize + 'px;';
+		qrHtml += ' background-color: ';
+		qrHtml += _this.isDark(r, c)? '#000000' : '#ffffff';
+		qrHtml += ';';
+		qrHtml += '"/>';
+	    }
+
+	    qrHtml += '</tr>';
+	}
+
+	qrHtml += '</tbody>';
+	qrHtml += '</table>';
+
+	return qrHtml;
+    };
+
+    _this.createImgTag = function(cellSize, margin, size) {
+
+	cellSize = cellSize || 2;
+	margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
+
+	var min = margin;
+	var max = _this.getModuleCount() * cellSize + margin;
+
+	return createImgTag(size, size, function(x, y) {
+	    if (min <= x && x < max && min <= y && y < max) {
+		var c = Math.floor( (x - min) / cellSize);
+		var r = Math.floor( (y - min) / cellSize);
+		return _this.isDark(r, c)? 0 : 1;
+	    } else {
+		return 1;
+	    }
+	} );
+    };
+
+    return _this;
+};
+
+//---------------------------------------------------------------------
+// qrcode.stringToBytes
+//---------------------------------------------------------------------
+
+qrcode.stringToBytes = function(s) {
+    var bytes = new Array();
+    for (var i = 0; i < s.length; i += 1) {
+	var c = s.charCodeAt(i);
+	bytes.push(c & 0xff);
+    }
+    return bytes;
+};
+
+//---------------------------------------------------------------------
+// qrcode.createStringToBytes
+//---------------------------------------------------------------------
+
+/**
+ * @param unicodeData base64 string of byte array.
+ * [16bit Unicode],[16bit Bytes], ...
+ * @param numChars
+ */
+qrcode.createStringToBytes = function(unicodeData, numChars) {
+
+    // create conversion map.
+
+    var unicodeMap = function() {
+
+	var bin = base64DecodeInputStream(unicodeData);
+	var read = function() {
+	    var b = bin.read();
+	    if (b == -1) throw new Error();
+	    return b;
+	};
+
+	var count = 0;
+	var unicodeMap = {};
+	while (true) {
+	    var b0 = bin.read();
+	    if (b0 == -1) break;
+	    var b1 = read();
+	    var b2 = read();
+	    var b3 = read();
+	    var k = String.fromCharCode( (b0 << 8) | b1);
+	    var v = (b2 << 8) | b3;
+	    unicodeMap[k] = v;
+	    count += 1;
+	}
+	if (count != numChars) {
+	    throw new Error(count + ' != ' + numChars);
+	}
+
+	return unicodeMap;
+    }();
+
+    var unknownChar = '?'.charCodeAt(0);
+
+    return function(s) {
+	var bytes = new Array();
+	for (var i = 0; i < s.length; i += 1) {
+	    var c = s.charCodeAt(i);
+	    if (c < 128) {
+		bytes.push(c);
+	    } else {
+		var b = unicodeMap[s.charAt(i)];
+		if (typeof b == 'number') {
+		    if ( (b & 0xff) == b) {
+			// 1byte
+			bytes.push(b);
+		    } else {
+			// 2bytes
+			bytes.push(b >>> 8);
+			bytes.push(b & 0xff);
+		    }
+		} else {
+		    bytes.push(unknownChar);
+		}
+	    }
+	}
+	return bytes;
+    };
+};
+
+//---------------------------------------------------------------------
+// QRMode
+//---------------------------------------------------------------------
+
+var QRMode = {
+    MODE_NUMBER :		1 << 0,
+    MODE_ALPHA_NUM : 	1 << 1,
+    MODE_8BIT_BYTE : 	1 << 2,
+    MODE_KANJI :		1 << 3
+};
+
+//---------------------------------------------------------------------
+// QRErrorCorrectLevel
+//---------------------------------------------------------------------
+
+var QRErrorCorrectLevel = {
+    L : 1,
+    M : 0,
+    Q : 3,
+    H : 2
+};
+
+//---------------------------------------------------------------------
+// QRMaskPattern
+//---------------------------------------------------------------------
+
+var QRMaskPattern = {
+    PATTERN000 : 0,
+    PATTERN001 : 1,
+    PATTERN010 : 2,
+    PATTERN011 : 3,
+    PATTERN100 : 4,
+    PATTERN101 : 5,
+    PATTERN110 : 6,
+    PATTERN111 : 7
+};
+
+//---------------------------------------------------------------------
+// QRUtil
+//---------------------------------------------------------------------
+
+var QRUtil = function() {
+
+    var PATTERN_POSITION_TABLE = [
+	[],
+	[6, 18],
+	[6, 22],
+	[6, 26],
+	[6, 30],
+	[6, 34],
+	[6, 22, 38],
+	[6, 24, 42],
+	[6, 26, 46],
+	[6, 28, 50],
+	[6, 30, 54],
+	[6, 32, 58],
+	[6, 34, 62],
+	[6, 26, 46, 66],
+	[6, 26, 48, 70],
+	[6, 26, 50, 74],
+	[6, 30, 54, 78],
+	[6, 30, 56, 82],
+	[6, 30, 58, 86],
+	[6, 34, 62, 90],
+	[6, 28, 50, 72, 94],
+	[6, 26, 50, 74, 98],
+	[6, 30, 54, 78, 102],
+	[6, 28, 54, 80, 106],
+	[6, 32, 58, 84, 110],
+	[6, 30, 58, 86, 114],
+	[6, 34, 62, 90, 118],
+	[6, 26, 50, 74, 98, 122],
+	[6, 30, 54, 78, 102, 126],
+	[6, 26, 52, 78, 104, 130],
+	[6, 30, 56, 82, 108, 134],
+	[6, 34, 60, 86, 112, 138],
+	[6, 30, 58, 86, 114, 142],
+	[6, 34, 62, 90, 118, 146],
+	[6, 30, 54, 78, 102, 126, 150],
+	[6, 24, 50, 76, 102, 128, 154],
+	[6, 28, 54, 80, 106, 132, 158],
+	[6, 32, 58, 84, 110, 136, 162],
+	[6, 26, 54, 82, 110, 138, 166],
+	[6, 30, 58, 86, 114, 142, 170]
+    ];
+    var G15 = (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0);
+    var G18 = (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0);
+    var G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1);
+
+    var _this = {};
+
+    var getBCHDigit = function(data) {
+	var digit = 0;
+	while (data != 0) {
+	    digit += 1;
+	    data >>>= 1;
+	}
+	return digit;
+    };
+
+    _this.getBCHTypeInfo = function(data) {
+	var d = data << 10;
+	while (getBCHDigit(d) - getBCHDigit(G15) >= 0) {
+	    d ^= (G15 << (getBCHDigit(d) - getBCHDigit(G15) ) );
+	}
+	return ( (data << 10) | d) ^ G15_MASK;
+    };
+
+    _this.getBCHTypeNumber = function(data) {
+	var d = data << 12;
+	while (getBCHDigit(d) - getBCHDigit(G18) >= 0) {
+	    d ^= (G18 << (getBCHDigit(d) - getBCHDigit(G18) ) );
+	}
+	return (data << 12) | d;
+    };
+
+    _this.getPatternPosition = function(typeNumber) {
+	return PATTERN_POSITION_TABLE[typeNumber - 1];
+    };
+
+    _this.getMaskFunction = function(maskPattern) {
+
+	switch (maskPattern) {
+
+	    case QRMaskPattern.PATTERN000 :
+		return function(i, j) { return (i + j) % 2 == 0; };
+	    case QRMaskPattern.PATTERN001 :
+		return function(i, j) { return i % 2 == 0; };
+	    case QRMaskPattern.PATTERN010 :
+		return function(i, j) { return j % 3 == 0; };
+	    case QRMaskPattern.PATTERN011 :
+		return function(i, j) { return (i + j) % 3 == 0; };
+	    case QRMaskPattern.PATTERN100 :
+		return function(i, j) { return (Math.floor(i / 2) + Math.floor(j / 3) ) % 2 == 0; };
+	    case QRMaskPattern.PATTERN101 :
+		return function(i, j) { return (i * j) % 2 + (i * j) % 3 == 0; };
+	    case QRMaskPattern.PATTERN110 :
+		return function(i, j) { return ( (i * j) % 2 + (i * j) % 3) % 2 == 0; };
+	    case QRMaskPattern.PATTERN111 :
+		return function(i, j) { return ( (i * j) % 3 + (i + j) % 2) % 2 == 0; };
+
+		default :
+		throw new Error('bad maskPattern:' + maskPattern);
+	}
+    };
+
+    _this.getErrorCorrectPolynomial = function(errorCorrectLength) {
+	var a = qrPolynomial([1], 0);
+	for (var i = 0; i < errorCorrectLength; i += 1) {
+	    a = a.multiply(qrPolynomial([1, QRMath.gexp(i)], 0) );
+	}
+	return a;
+    };
+
+    _this.getLengthInBits = function(mode, type) {
+
+	if (1 <= type && type < 10) {
+
+	    // 1 - 9
+
+	    switch(mode) {
+		case QRMode.MODE_NUMBER 	: return 10;
+		case QRMode.MODE_ALPHA_NUM 	: return 9;
+		case QRMode.MODE_8BIT_BYTE	: return 8;
+		case QRMode.MODE_KANJI		: return 8;
+		    default :
+		    throw new Error('mode:' + mode);
+	    }
+
+	} else if (type < 27) {
+
+	    // 10 - 26
+
+	    switch(mode) {
+		case QRMode.MODE_NUMBER 	: return 12;
+		case QRMode.MODE_ALPHA_NUM 	: return 11;
+		case QRMode.MODE_8BIT_BYTE	: return 16;
+		case QRMode.MODE_KANJI		: return 10;
+		    default :
+		    throw new Error('mode:' + mode);
+	    }
+
+	} else if (type < 41) {
+
+	    // 27 - 40
+
+	    switch(mode) {
+		case QRMode.MODE_NUMBER 	: return 14;
+		case QRMode.MODE_ALPHA_NUM	: return 13;
+		case QRMode.MODE_8BIT_BYTE	: return 16;
+		case QRMode.MODE_KANJI		: return 12;
+		    default :
+		    throw new Error('mode:' + mode);
+	    }
+
+	} else {
+	    throw new Error('type:' + type);
+	}
+    };
+
+    _this.getLostPoint = function(qrcode) {
+
+	var moduleCount = qrcode.getModuleCount();
+
+	var lostPoint = 0;
+
+	// LEVEL1
+
+	for (var row = 0; row < moduleCount; row += 1) {
+	    for (var col = 0; col < moduleCount; col += 1) {
+
+		var sameCount = 0;
+		var dark = qrcode.isDark(row, col);
+
+		for (var r = -1; r <= 1; r += 1) {
+
+		    if (row + r < 0 || moduleCount <= row + r) {
+			continue;
+		    }
+
+		    for (var c = -1; c <= 1; c += 1) {
+
+			if (col + c < 0 || moduleCount <= col + c) {
+			    continue;
+			}
+
+			if (r == 0 && c == 0) {
+			    continue;
+			}
+
+			if (dark == qrcode.isDark(row + r, col + c) ) {
+			    sameCount += 1;
+			}
+		    }
+		}
+
+		if (sameCount > 5) {
+		    lostPoint += (3 + sameCount - 5);
+		}
+	    }
+	};
+
+	// LEVEL2
+
+	for (var row = 0; row < moduleCount - 1; row += 1) {
+	    for (var col = 0; col < moduleCount - 1; col += 1) {
+		var count = 0;
+		if (qrcode.isDark(row, col) ) count += 1;
+		if (qrcode.isDark(row + 1, col) ) count += 1;
+		if (qrcode.isDark(row, col + 1) ) count += 1;
+		if (qrcode.isDark(row + 1, col + 1) ) count += 1;
+		if (count == 0 || count == 4) {
+		    lostPoint += 3;
+		}
+	    }
+	}
+
+	// LEVEL3
+
+	for (var row = 0; row < moduleCount; row += 1) {
+	    for (var col = 0; col < moduleCount - 6; col += 1) {
+		if (qrcode.isDark(row, col)
+		    && !qrcode.isDark(row, col + 1)
+		    &&  qrcode.isDark(row, col + 2)
+		    &&  qrcode.isDark(row, col + 3)
+		    &&  qrcode.isDark(row, col + 4)
+		    && !qrcode.isDark(row, col + 5)
+		    &&  qrcode.isDark(row, col + 6) ) {
+		    lostPoint += 40;
+		}
+	    }
+	}
+
+	for (var col = 0; col < moduleCount; col += 1) {
+	    for (var row = 0; row < moduleCount - 6; row += 1) {
+		if (qrcode.isDark(row, col)
+		    && !qrcode.isDark(row + 1, col)
+		    &&  qrcode.isDark(row + 2, col)
+		    &&  qrcode.isDark(row + 3, col)
+		    &&  qrcode.isDark(row + 4, col)
+		    && !qrcode.isDark(row + 5, col)
+		    &&  qrcode.isDark(row + 6, col) ) {
+		    lostPoint += 40;
+		}
+	    }
+	}
+
+	// LEVEL4
+
+	var darkCount = 0;
+
+	for (var col = 0; col < moduleCount; col += 1) {
+	    for (var row = 0; row < moduleCount; row += 1) {
+		if (qrcode.isDark(row, col) ) {
+		    darkCount += 1;
+		}
+	    }
+	}
+
+	var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
+	lostPoint += ratio * 10;
+
+	return lostPoint;
+    };
+
+    return _this;
+}();
+
+//---------------------------------------------------------------------
+// QRMath
+//---------------------------------------------------------------------
+
+var QRMath = function() {
+
+    var EXP_TABLE = new Array(256);
+    var LOG_TABLE = new Array(256);
+
+    // initialize tables
+    for (var i = 0; i < 8; i += 1) {
+	EXP_TABLE[i] = 1 << i;
+    }
+    for (var i = 8; i < 256; i += 1) {
+	EXP_TABLE[i] = EXP_TABLE[i - 4]
+	    ^ EXP_TABLE[i - 5]
+	    ^ EXP_TABLE[i - 6]
+	    ^ EXP_TABLE[i - 8];
+    }
+    for (var i = 0; i < 255; i += 1) {
+	LOG_TABLE[EXP_TABLE[i] ] = i;
+    }
+
+    var _this = {};
+
+    _this.glog = function(n) {
+
+	if (n < 1) {
+	    throw new Error('glog(' + n + ')');
+	}
+
+	return LOG_TABLE[n];
+    };
+
+    _this.gexp = function(n) {
+
+	while (n < 0) {
+	    n += 255;
+	}
+
+	while (n >= 256) {
+	    n -= 255;
+	}
+
+	return EXP_TABLE[n];
+    };
+
+    return _this;
+}();
+
+//---------------------------------------------------------------------
+// qrPolynomial
+//---------------------------------------------------------------------
+
+function qrPolynomial(num, shift) {
+
+    if (typeof num.length == 'undefined') {
+	throw new Error(num.length + '/' + shift);
+    }
+
+    var _num = function() {
+	var offset = 0;
+	while (offset < num.length && num[offset] == 0) {
+	    offset += 1;
+	}
+	var _num = new Array(num.length - offset + shift);
+	for (var i = 0; i < num.length - offset; i += 1) {
+	    _num[i] = num[i + offset];
+	}
+	return _num;
+    }();
+
+    var _this = {};
+
+    _this.getAt = function(index) {
+	return _num[index];
+    };
+
+    _this.getLength = function() {
+	return _num.length;
+    };
+
+    _this.multiply = function(e) {
+
+	var num = new Array(_this.getLength() + e.getLength() - 1);
+
+	for (var i = 0; i < _this.getLength(); i += 1) {
+	    for (var j = 0; j < e.getLength(); j += 1) {
+		num[i + j] ^= QRMath.gexp(QRMath.glog(_this.getAt(i) ) + QRMath.glog(e.getAt(j) ) );
+	    }
+	}
+
+	return qrPolynomial(num, 0);
+    };
+
+    _this.mod = function(e) {
+
+	if (_this.getLength() - e.getLength() < 0) {
+	    return _this;
+	}
+
+	var ratio = QRMath.glog(_this.getAt(0) ) - QRMath.glog(e.getAt(0) );
+
+	var num = new Array(_this.getLength() );
+	for (var i = 0; i < _this.getLength(); i += 1) {
+	    num[i] = _this.getAt(i);
+	}
+
+	for (var i = 0; i < e.getLength(); i += 1) {
+	    num[i] ^= QRMath.gexp(QRMath.glog(e.getAt(i) ) + ratio);
+	}
+
+	// recursive call
+	return qrPolynomial(num, 0).mod(e);
+    };
+
+    return _this;
+};
+
+//---------------------------------------------------------------------
+// QRRSBlock
+//---------------------------------------------------------------------
+
+var QRRSBlock = function() {
+
+
+    // [1: [L, M, Q, H], ..]
+    var RS_BLOCK_TABLE=[[1,26,19],[1,26,16],[1,26,13],[1,26,9],[1,44,34],[1,44,28],[1,44,22],[1,44,16],[1,70,55],[1,70,44],[2,35,17],[2,35,13],[1,100,80],[2,50,32],[2,50,24],[4,25,9],[1,134,108],[2,67,43],[2,33,15,2,34,16],[2,33,11,2,34,12],[2,86,68],[4,43,27],[4,43,19],[4,43,15],[2,98,78],[4,49,31],[2,32,14,4,33,15],[4,39,13,1,40,14],[2,121,97],[2,60,38,2,61,39],[4,40,18,2,41,19],[4,40,14,2,41,15],[2,146,116],[3,58,36,2,59,37],[4,36,16,4,37,17],[4,36,12,4,37,13],[2,86,68,2,87,69],[4,69,43,1,70,44],[6,43,19,2,44,20],[6,43,15,2,44,16],[4,101,81],[1,80,50,4,81,51],[4,50,22,4,51,23],[3,36,12,8,37,13],[2,116,92,2,117,93],[6,58,36,2,59,37],[4,46,20,6,47,21],[7,42,14,4,43,15],[4,133,107],[8,59,37,1,60,38],[8,44,20,4,45,21],[12,33,11,4,34,12],[3,145,115,1,146,116],[4,64,40,5,65,41],[11,36,16,5,37,17],[11,36,12,5,37,13],[5,109,87,1,110,88],[5,65,41,5,66,42],[5,54,24,7,55,25],[11,36,12],[5,122,98,1,123,99],[7,73,45,3,74,46],[15,43,19,2,44,20],[3,45,15,13,46,16],[1,135,107,5,136,108],[10,74,46,1,75,47],[1,50,22,15,51,23],[2,42,14,17,43,15],[5,150,120,1,151,121],[9,69,43,4,70,44],[17,50,22,1,51,23],[2,42,14,19,43,15],[3,141,113,4,142,114],[3,70,44,11,71,45],[17,47,21,4,48,22],[9,39,13,16,40,14],[3,135,107,5,136,108],[3,67,41,13,68,42],[15,54,24,5,55,25],[15,43,15,10,44,16],[4,144,116,4,145,117],[17,68,42],[17,50,22,6,51,23],[19,46,16,6,47,17],[2,139,111,7,140,112],[17,74,46],[7,54,24,16,55,25],[34,37,13],[4,151,121,5,152,122],[4,75,47,14,76,48],[11,54,24,14,55,25],[16,45,15,14,46,16],[6,147,117,4,148,118],[6,73,45,14,74,46],[11,54,24,16,55,25],[30,46,16,2,47,17],[8,132,106,4,133,107],[8,75,47,13,76,48],[7,54,24,22,55,25],[22,45,15,13,46,16],[10,142,114,2,143,115],[19,74,46,4,75,47],[28,50,22,6,51,23],[33,46,16,4,47,17],[8,152,122,4,153,123],[22,73,45,3,74,46],[8,53,23,26,54,24],[12,45,15,28,46,16],[3,147,117,10,148,118],[3,73,45,23,74,46],[4,54,24,31,55,25],[11,45,15,31,46,16],[7,146,116,7,147,117],[21,73,45,7,74,46],[1,53,23,37,54,24],[19,45,15,26,46,16],[5,145,115,10,146,116],[19,75,47,10,76,48],[15,54,24,25,55,25],[23,45,15,25,46,16],[13,145,115,3,146,116],[2,74,46,29,75,47],[42,54,24,1,55,25],[23,45,15,28,46,16],[17,145,115],[10,74,46,23,75,47],[10,54,24,35,55,25],[19,45,15,35,46,16],[17,145,115,1,146,116],[14,74,46,21,75,47],[29,54,24,19,55,25],[11,45,15,46,46,16],[13,145,115,6,146,116],[14,74,46,23,75,47],[44,54,24,7,55,25],[59,46,16,1,47,17],[12,151,121,7,152,122],[12,75,47,26,76,48],[39,54,24,14,55,25],[22,45,15,41,46,16],[6,151,121,14,152,122],[6,75,47,34,76,48],[46,54,24,10,55,25],[2,45,15,64,46,16],[17,152,122,4,153,123],[29,74,46,14,75,47],[49,54,24,10,55,25],[24,45,15,46,46,16],[4,152,122,18,153,123],[13,74,46,32,75,47],[48,54,24,14,55,25],[42,45,15,32,46,16],[20,147,117,4,148,118],[40,75,47,7,76,48],[43,54,24,22,55,25],[10,45,15,67,46,16],[19,148,118,6,149,119],[18,75,47,31,76,48],[34,54,24,34,55,25],[20,45,15,61,46,16]];
+
+    var qrRSBlock = function(totalCount, dataCount) {
+	var _this = {};
+	_this.totalCount = totalCount;
+	_this.dataCount = dataCount;
+	return _this;
+    };
+
+    var _this = {};
+
+    var getRsBlockTable = function(typeNumber, errorCorrectLevel) {
+
+	switch(errorCorrectLevel) {
+	    case QRErrorCorrectLevel.L :
+		return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
+	    case QRErrorCorrectLevel.M :
+		return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
+	    case QRErrorCorrectLevel.Q :
+		return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
+	    case QRErrorCorrectLevel.H :
+		return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
+		default :
+		return undefined;
+	}
+    };
+
+    _this.getRSBlocks = function(typeNumber, errorCorrectLevel) {
+
+	var rsBlock = getRsBlockTable(typeNumber, errorCorrectLevel);
+
+	if (typeof rsBlock == 'undefined') {
+	    throw new Error('bad rs block @ typeNumber:' + typeNumber +
+			    '/errorCorrectLevel:' + errorCorrectLevel);
+	}
+
+	var length = rsBlock.length / 3;
+
+	var list = new Array();
+
+	for (var i = 0; i < length; i += 1) {
+
+	    var count = rsBlock[i * 3 + 0];
+	    var totalCount = rsBlock[i * 3 + 1];
+	    var dataCount = rsBlock[i * 3 + 2];
+
+	    for (var j = 0; j < count; j += 1) {
+		list.push(qrRSBlock(totalCount, dataCount) );
+	    }
+	}
+
+	return list;
+    };
+
+    return _this;
+}();
+
+//---------------------------------------------------------------------
+// qrBitBuffer
+//---------------------------------------------------------------------
+
+var qrBitBuffer = function() {
+
+    var _buffer = new Array();
+    var _length = 0;
+
+    var _this = {};
+
+    _this.getBuffer = function() {
+	return _buffer;
+    };
+
+    _this.getAt = function(index) {
+	var bufIndex = Math.floor(index / 8);
+	return ( (_buffer[bufIndex] >>> (7 - index % 8) ) & 1) == 1;
+    };
+
+    _this.put = function(num, length) {
+	for (var i = 0; i < length; i += 1) {
+	    _this.putBit( ( (num >>> (length - i - 1) ) & 1) == 1);
+	}
+    };
+
+    _this.getLengthInBits = function() {
+	return _length;
+    };
+
+    _this.putBit = function(bit) {
+
+	var bufIndex = Math.floor(_length / 8);
+	if (_buffer.length <= bufIndex) {
+	    _buffer.push(0);
+	}
+
+	if (bit) {
+	    _buffer[bufIndex] |= (0x80 >>> (_length % 8) );
+	}
+
+	_length += 1;
+    };
+
+    return _this;
+};
+
+//---------------------------------------------------------------------
+// qr8BitByte
+//---------------------------------------------------------------------
+
+var qr8BitByte = function(data) {
+
+    var _mode = QRMode.MODE_8BIT_BYTE;
+    var _data = data;
+    var _parsedData = [];
+
+    var _this = {};
+
+
+    // Added to support UTF-8 Characters
+    for (var i = 0, l = _data.length; i < l; i++) {
+	var byteArray = [];
+	var code = _data.charCodeAt(i);
+
+	if (code > 0x10000) {
+	    byteArray[0] = 0xF0 | ((code & 0x1C0000) >>> 18);
+	    byteArray[1] = 0x80 | ((code & 0x3F000) >>> 12);
+	    byteArray[2] = 0x80 | ((code & 0xFC0) >>> 6);
+	    byteArray[3] = 0x80 | (code & 0x3F);
+	} else if (code > 0x800) {
+	    byteArray[0] = 0xE0 | ((code & 0xF000) >>> 12);
+	    byteArray[1] = 0x80 | ((code & 0xFC0) >>> 6);
+	    byteArray[2] = 0x80 | (code & 0x3F);
+	} else if (code > 0x80) {
+	    byteArray[0] = 0xC0 | ((code & 0x7C0) >>> 6);
+	    byteArray[1] = 0x80 | (code & 0x3F);
+	} else {
+	    byteArray[0] = code;
+	}
+
+        // Fix Unicode corruption bug
+        _parsedData.push(byteArray);
+    }
+
+    _parsedData = Array.prototype.concat.apply([], _parsedData);
+
+    if (_parsedData.length != _data.length) {
+	_parsedData.unshift(191);
+	_parsedData.unshift(187);
+	_parsedData.unshift(239);
+    }
+
+    var _bytes = _parsedData;
+
+    _this.getMode = function() {
+	return _mode;
+    };
+
+    _this.getLength = function(buffer) {
+	return _bytes.length;
+    };
+
+    _this.write = function(buffer) {
+	for (var i = 0; i < _bytes.length; i += 1) {
+	    buffer.put(_bytes[i], 8);
+	}
+    };
+
+    return _this;
+};
+
+//=====================================================================
+// GIF Support etc.
+//
+
+//---------------------------------------------------------------------
+// byteArrayOutputStream
+//---------------------------------------------------------------------
+
+var byteArrayOutputStream = function() {
+
+    var _bytes = new Array();
+
+    var _this = {};
+
+    _this.writeByte = function(b) {
+	_bytes.push(b & 0xff);
+    };
+
+    _this.writeShort = function(i) {
+	_this.writeByte(i);
+	_this.writeByte(i >>> 8);
+    };
+
+    _this.writeBytes = function(b, off, len) {
+	off = off || 0;
+	len = len || b.length;
+	for (var i = 0; i < len; i += 1) {
+	    _this.writeByte(b[i + off]);
+	}
+    };
+
+    _this.writeString = function(s) {
+	for (var i = 0; i < s.length; i += 1) {
+	    _this.writeByte(s.charCodeAt(i) );
+	}
+    };
+
+    _this.toByteArray = function() {
+	return _bytes;
+    };
+
+    _this.toString = function() {
+	var s = '';
+	s += '[';
+	for (var i = 0; i < _bytes.length; i += 1) {
+	    if (i > 0) {
+		s += ',';
+	    }
+	    s += _bytes[i];
+	}
+	s += ']';
+	return s;
+    };
+
+    return _this;
+};
+
+//---------------------------------------------------------------------
+// base64EncodeOutputStream
+//---------------------------------------------------------------------
+
+var base64EncodeOutputStream = function() {
+
+    var _buffer = 0;
+    var _buflen = 0;
+    var _length = 0;
+    var _base64 = '';
+
+    var _this = {};
+
+    var writeEncoded = function(b) {
+	_base64 += String.fromCharCode(encode(b & 0x3f) );
+    };
+
+    var encode = function(n) {
+	if (n < 0) {
+	    // error.
+	} else if (n < 26) {
+	    return 0x41 + n;
+	} else if (n < 52) {
+	    return 0x61 + (n - 26);
+	} else if (n < 62) {
+	    return 0x30 + (n - 52);
+	} else if (n == 62) {
+	    return 0x2b;
+	} else if (n == 63) {
+	    return 0x2f;
+	}
+	throw new Error('n:' + n);
+    };
+
+    _this.writeByte = function(n) {
+
+	_buffer = (_buffer << 8) | (n & 0xff);
+	_buflen += 8;
+	_length += 1;
+
+	while (_buflen >= 6) {
+	    writeEncoded(_buffer >>> (_buflen - 6) );
+	    _buflen -= 6;
+	}
+    };
+
+    _this.flush = function() {
+
+	if (_buflen > 0) {
+	    writeEncoded(_buffer << (6 - _buflen) );
+	    _buffer = 0;
+	    _buflen = 0;
+	}
+
+	if (_length % 3 != 0) {
+	    // padding
+	    var padlen = 3 - _length % 3;
+	    for (var i = 0; i < padlen; i += 1) {
+		_base64 += '=';
+	    }
+	}
+    };
+
+    _this.toString = function() {
+	return _base64;
+    };
+
+    return _this;
+};
+
+//---------------------------------------------------------------------
+// base64DecodeInputStream
+//---------------------------------------------------------------------
+
+var base64DecodeInputStream = function(str) {
+
+    var _str = str;
+    var _pos = 0;
+    var _buffer = 0;
+    var _buflen = 0;
+
+    var _this = {};
+
+    _this.read = function() {
+
+	while (_buflen < 8) {
+
+	    if (_pos >= _str.length) {
+		if (_buflen == 0) {
+		    return -1;
+		}
+		throw new Error('unexpected end of file./' + _buflen);
+	    }
+
+	    var c = _str.charAt(_pos);
+	    _pos += 1;
+
+	    if (c == '=') {
+		_buflen = 0;
+		return -1;
+	    } else if (c.match(/^\s$/) ) {
+		// ignore if whitespace.
+		continue;
+	    }
+
+	    _buffer = (_buffer << 6) | decode(c.charCodeAt(0) );
+	    _buflen += 6;
+	}
+
+	var n = (_buffer >>> (_buflen - 8) ) & 0xff;
+	_buflen -= 8;
+	return n;
+    };
+
+    var decode = function(c) {
+	if (0x41 <= c && c <= 0x5a) {
+	    return c - 0x41;
+	} else if (0x61 <= c && c <= 0x7a) {
+	    return c - 0x61 + 26;
+	} else if (0x30 <= c && c <= 0x39) {
+	    return c - 0x30 + 52;
+	} else if (c == 0x2b) {
+	    return 62;
+	} else if (c == 0x2f) {
+	    return 63;
+	} else {
+	    throw new Error('c:' + c);
+	}
+    };
+
+    return _this;
+};
+
+//---------------------------------------------------------------------
+// gifImage (B/W)
+//---------------------------------------------------------------------
+
+var gifImage = function(width, height) {
+
+    var _width = width;
+    var _height = height;
+    var _data = new Array(width * height);
+
+    var _this = {};
+
+    _this.setPixel = function(x, y, pixel) {
+	_data[y * _width + x] = pixel;
+    };
+
+    _this.write = function(out) {
+
+	//---------------------------------
+	// GIF Signature
+
+	out.writeString('GIF87a');
+
+	//---------------------------------
+	// Screen Descriptor
+
+	out.writeShort(_width);
+	out.writeShort(_height);
+
+	out.writeByte(0x80); // 2bit
+	out.writeByte(0);
+	out.writeByte(0);
+
+	//---------------------------------
+	// Global Color Map
+
+	// black
+	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 new Error('length over');
+	    }
+
+	    while (_bitLength + length >= 8) {
+		_out.writeByte(0xff & ( (data << _bitLength) | _bitBuffer) );
+		length -= (8 - _bitLength);
+		data >>>= (8 - _bitLength);
+		_bitBuffer = 0;
+		_bitLength = 0;
+	    }
+
+	    _bitBuffer = (data << _bitLength) | _bitBuffer;
+	    _bitLength = _bitLength + length;
+	};
+
+	_this.flush = function() {
+	    if (_bitLength > 0) {
+		_out.writeByte(_bitBuffer);
+	    }
+	};
+
+	return _this;
+    };
+
+    var getLZWRaster = function(lzwMinCodeSize) {
+
+	var clearCode = 1 << lzwMinCodeSize;
+	var endCode = (1 << lzwMinCodeSize) + 1;
+	var bitLength = lzwMinCodeSize + 1;
+
+	// Setup LZWTable
+	var table = lzwTable();
+
+	for (var i = 0; i < clearCode; i += 1) {
+	    table.add(String.fromCharCode(i) );
+	}
+	table.add(String.fromCharCode(clearCode) );
+	table.add(String.fromCharCode(endCode) );
+
+	var byteOut = byteArrayOutputStream();
+	var bitOut = bitOutputStream(byteOut);
+
+	// clear code
+	bitOut.write(clearCode, bitLength);
+
+	var dataIndex = 0;
+
+	var s = String.fromCharCode(_data[dataIndex]);
+	dataIndex += 1;
+
+	while (dataIndex < _data.length) {
+
+	    var c = String.fromCharCode(_data[dataIndex]);
+	    dataIndex += 1;
+
+	    if (table.contains(s + c) ) {
+
+		s = s + c;
+
+	    } else {
+
+		bitOut.write(table.indexOf(s), bitLength);
+
+		if (table.size() < 0xfff) {
+
+		    if (table.size() == (1 << bitLength) ) {
+			bitLength += 1;
+		    }
+
+		    table.add(s + c);
+		}
+
+		s = c;
+	    }
+	}
+
+	bitOut.write(table.indexOf(s), bitLength);
+
+	// end code
+	bitOut.write(endCode, bitLength);
+
+	bitOut.flush();
+
+	return byteOut.toByteArray();
+    };
+
+    var lzwTable = function() {
+
+	var _map = {};
+	var _size = 0;
+
+	var _this = {};
+
+	_this.add = function(key) {
+	    if (_this.contains(key) ) {
+		throw new Error('dup key:' + key);
+	    }
+	    _map[key] = _size;
+	    _size += 1;
+	};
+
+	_this.size = function() {
+	    return _size;
+	};
+
+	_this.indexOf = function(key) {
+	    return _map[key];
+	};
+
+	_this.contains = function(key) {
+	    return typeof _map[key] != 'undefined';
+	};
+
+	return _this;
+    };
+
+    return _this;
+};
+
+var createImgTag = function(width, height, getPixel, alt) {
+
+    var gif = gifImage(width, height);
+    for (var y = 0; y < height; y += 1) {
+	for (var x = 0; x < width; x += 1) {
+	    gif.setPixel(x, y, getPixel(x, y) );
+	}
+    }
+
+    var b = byteArrayOutputStream();
+    gif.write(b);
+
+    var base64 = base64EncodeOutputStream();
+    var bytes = b.toByteArray();
+    for (var i = 0; i < bytes.length; i += 1) {
+	base64.writeByte(bytes[i]);
+    }
+    base64.flush();
+
+    var img = '';
+    img += 'data:image/gif;base64,';
+    img += base64;
+
+    return img;
+};
+
+//---------------------------------------------------------------------
+// returns qrcode function.
+
+var drawImg = function(text, options) {
+    options = options || {};
+    var typeNumber = options.typeNumber || 4;
+    var errorCorrectLevel = options.errorCorrectLevel || 'M';
+    var size = options.size || 500;
+
+    var qr;
+
+    try {
+        qr = qrcode(typeNumber, errorCorrectLevel || 'M');
+        qr.addData(text);
+        qr.make();
+    } catch (e) {
+        if(typeNumber >= 40) {
+            throw new Error('Text too long to encode');
+        } else {
+            return drawImg(text, {
+                size: size,
+                errorCorrectLevel: errorCorrectLevel,
+                typeNumber: typeNumber + 1
+            });
+        }
+    }
+
+    // calc cellsize and margin
+    var cellsize = parseInt(size / qr.getModuleCount());
+    var margin = parseInt((size - qr.getModuleCount() * cellsize) / 2);
+
+    return qr.createImgTag(cellsize, margin, size);
+};
+module.exports = {
+	drawImg: drawImg
+};
\ No newline at end of file