/* jQuery.qrcode 0.10.1 - http://larsjung.de/jquery-qrcode/ - uses //github.com/kazuhikoarase/qrcode-generator (MIT) */
(function () {
'use strict';

var $ = jQuery;

    // Wrapper for the original QR code generator.
var QRCode = function (text, level, version, quiet) {

        // `qrcode` is the single public function that will be defined by the `QR Code Generator`
        // at the end of the file.
        var qr = qrcode(version, level);
        qr.addData(text);
        qr.make();

        quiet = quiet || 0;

        var qrModuleCount = qr.getModuleCount(),
            quietModuleCount = qr.getModuleCount() + 2*quiet,
            isDark = function (row, col) {

                row -= quiet;
                col -= quiet;

                if (row < 0 || row >= qrModuleCount || col < 0 || col >= qrModuleCount) {
                    return false;
                }

                return qr.isDark(row, col);
            },
            addBlank = function (l, t, r, b) {

                var prevIsDark = this.isDark,
                    moduleSize = 1 / quietModuleCount;

                this.isDark = function (row, col) {

                    var ml = col * moduleSize,
                        mt = row * moduleSize,
                        mr = ml + moduleSize,
                        mb = mt + moduleSize;

                    return prevIsDark(row, col) && (l > mr || ml > r || t > mb || mt > b);
                };
            };

        this.text = text;
        this.level = level;
        this.version = version;
        this.moduleCount = quietModuleCount;
        this.isDark = isDark;
        this.addBlank = addBlank;
    },

    // Check if canvas is available in the browser (as Modernizr does)
    canvasAvailable = (function () {

        var elem = document.createElement('canvas');
        return !!(elem.getContext && elem.getContext('2d'));
    }()),

    arcToAvailable = Object.prototype.toString.call(window.opera) !== '[object Opera]',

    // Returns a minimal QR code for the given text starting with version `minVersion`.
    // Returns `null` if `text` is too long to be encoded in `maxVersion`.
    createQRCode = function (text, level, minVersion, maxVersion, quiet) {

        minVersion = Math.max(1, minVersion || 1);
        maxVersion = Math.min(40, maxVersion || 40);
        for (var version = minVersion; version <= maxVersion; version += 1) {
            try {
                return new QRCode(text, level, version, quiet);
            } catch (err) {}
        }
    },

    drawBackgroundLabel = function (qr, context, settings) {

        var size = settings.size,
            font = "bold " + (settings.mSize * size) + "px " + settings.fontname,
            ctx = $('<canvas/>')[0].getContext("2d");

        ctx.font = font;

        var w = ctx.measureText(settings.label).width,
            sh = settings.mSize,
            sw = w / size,
            sl = (1 - sw) * settings.mPosX,
            st = (1 - sh) * settings.mPosY,
            sr = sl + sw,
            sb = st + sh,
            pad = 0.01;

        if (settings.mode === 1) {
            // Strip
            qr.addBlank(0, st - pad, size, sb + pad);
        } else {
            // Box
            qr.addBlank(sl - pad, st - pad, sr + pad, sb + pad);
        }

        context.fillStyle = settings.fontcolor;
        context.font = font;
        context.fillText(settings.label, sl*size, st*size + 0.75 * settings.mSize * size);
    },

    drawBackgroundImage = function (qr, context, settings) {

        var size = settings.size,
            w = settings.image.naturalWidth || 1,
            h = settings.image.naturalHeight || 1,
            sh = settings.mSize,
            sw = sh * w / h,
            sl = (1 - sw) * settings.mPosX,
            st = (1 - sh) * settings.mPosY,
            sr = sl + sw,
            sb = st + sh,
            pad = 0.01;

        if (settings.mode === 3) {
            // Strip
            qr.addBlank(0, st - pad, size, sb + pad);
        } else {
            // Box
            qr.addBlank(sl - pad, st - pad, sr + pad, sb + pad);
        }

        context.drawImage(settings.image, sl*size, st*size, sw*size, sh*size);
    },

    drawBackground = function (qr, context, settings) {

        if ($(settings.background).is('img')) {
            context.drawImage(settings.background, 0, 0, settings.size, settings.size);
        } else if (settings.background) {
            context.fillStyle = settings.background;
            context.fillRect(settings.left, settings.top, settings.size, settings.size);
        }

        var mode = settings.mode;
        if (mode === 1 || mode === 2) {
            drawBackgroundLabel(qr, context, settings);
        } else if (mode === 3 || mode === 4) {
            drawBackgroundImage(qr, context, settings);
        }
    },

    drawModuleDefault = function (qr, context, settings, left, top, width, row, col) {

        if (qr.isDark(row, col)) {
            context.rect(left, top, width, width);
        }
    },

    drawModuleRoundedDark = function (ctx, l, t, r, b, rad, nw, ne, se, sw) {

        if (nw) {
            ctx.moveTo(l + rad, t);
        } else {
            ctx.moveTo(l, t);
        }

        if (ne) {
            ctx.lineTo(r - rad, t);
            ctx.arcTo(r, t, r, b, rad);
        } else {
            ctx.lineTo(r, t);
        }

        if (se) {
            ctx.lineTo(r, b - rad);
            ctx.arcTo(r, b, l, b, rad);
        } else {
            ctx.lineTo(r, b);
        }

        if (sw) {
            ctx.lineTo(l + rad, b);
            ctx.arcTo(l, b, l, t, rad);
        } else {
            ctx.lineTo(l, b);
        }

        if (nw) {
            ctx.lineTo(l, t + rad);
            ctx.arcTo(l, t, r, t, rad);
        } else {
            ctx.lineTo(l, t);
        }
    },

    drawModuleRoundendLight = function (ctx, l, t, r, b, rad, nw, ne, se, sw) {

        if (nw) {
            ctx.moveTo(l + rad, t);
            ctx.lineTo(l, t);
            ctx.lineTo(l, t + rad);
            ctx.arcTo(l, t, l + rad, t, rad);
        }

        if (ne) {
            ctx.moveTo(r - rad, t);
            ctx.lineTo(r, t);
            ctx.lineTo(r, t + rad);
            ctx.arcTo(r, t, r - rad, t, rad);
        }

        if (se) {
            ctx.moveTo(r - rad, b);
            ctx.lineTo(r, b);
            ctx.lineTo(r, b - rad);
            ctx.arcTo(r, b, r - rad, b, rad);
        }

        if (sw) {
            ctx.moveTo(l + rad, b);
            ctx.lineTo(l, b);
            ctx.lineTo(l, b - rad);
            ctx.arcTo(l, b, l + rad, b, rad);
        }
    },

    drawModuleRounded = function (qr, context, settings, left, top, width, row, col) {

        var isDark = qr.isDark,
            right = left + width,
            bottom = top + width,
            radius = settings.radius * width,
            rowT = row - 1,
            rowB = row + 1,
            colL = col - 1,
            colR = col + 1,
            center = isDark(row, col),
            northwest = isDark(rowT, colL),
            north = isDark(rowT, col),
            northeast = isDark(rowT, colR),
            east = isDark(row, colR),
            southeast = isDark(rowB, colR),
            south = isDark(rowB, col),
            southwest = isDark(rowB, colL),
            west = isDark(row, colL);

        if (center) {
            drawModuleRoundedDark(context, left, top, right, bottom, radius, !north && !west, !north && !east, !south && !east, !south && !west);
        } else {
            drawModuleRoundendLight(context, left, top, right, bottom, radius, north && west && northwest, north && east && northeast, south && east && southeast, south && west && southwest);
        }
    },

    drawModules = function (qr, context, settings) {

        var moduleCount = qr.moduleCount,
            moduleSize = settings.size / moduleCount,
            fn = drawModuleDefault,
            row, col;

        if (arcToAvailable && settings.radius > 0 && settings.radius <= 0.5) {
            fn = drawModuleRounded;
        }

        context.beginPath();
        for (row = 0; row < moduleCount; row += 1) {
            for (col = 0; col < moduleCount; col += 1) {

                var l = settings.left + col * moduleSize,
                    t = settings.top + row * moduleSize,
                    w = moduleSize;

                fn(qr, context, settings, l, t, w, row, col);
            }
        }
        if ($(settings.fill).is('img')) {
            context.strokeStyle = 'rgba(0,0,0,0.5)';
            context.lineWidth = 2;
            context.stroke();
            var prev = context.globalCompositeOperation;
            context.globalCompositeOperation = "destination-out";
            context.fill();
            context.globalCompositeOperation = prev;

            context.clip();
            context.drawImage(settings.fill, 0, 0, settings.size, settings.size);
            context.restore();
        } else {
            context.fillStyle = settings.fill;
            context.fill();
        }
    },

    // Draws QR code to the given `canvas` and returns it.
    drawOnCanvas = function (canvas, settings) {

        var qr = createQRCode(settings.text, settings.ecLevel, settings.minVersion, settings.maxVersion, settings.quiet);
        if (!qr) {
            return null;
        }

        var $canvas = $(canvas).data('qrcode', qr),
            context = $canvas[0].getContext('2d');

        drawBackground(qr, context, settings);
        drawModules(qr, context, settings);

        return $canvas;
    },

    // Returns a `canvas` element representing the QR code for the given settings.
    createCanvas = function (settings) {

        var $canvas = $('<canvas/>').attr('width', settings.size).attr('height', settings.size);
        return drawOnCanvas($canvas, settings);
    },

    // Returns an `image` element representing the QR code for the given settings.
    createImage = function (settings) {

        return $('<img/>').attr('src', createCanvas(settings)[0].toDataURL('image/png'));
    },

    // Returns a `div` element representing the QR code for the given settings.
    createDiv = function (settings) {

        var qr = createQRCode(settings.text, settings.ecLevel, settings.minVersion, settings.maxVersion, settings.quiet);
        if (!qr) {
            return null;
        }

            // some shortcuts to improve compression
        var settings_size = settings.size,
            settings_bgColor = settings.background,
            math_floor = Math.floor,

            moduleCount = qr.moduleCount,
            moduleSize = math_floor(settings_size / moduleCount),
            offset = math_floor(0.5 * (settings_size - moduleSize * moduleCount)),

            row, col,

            containerCSS = {
                position: 'relative',
                left: 0,
                top: 0,
                padding: 0,
                margin: 0,
                width: settings_size,
                height: settings_size
            },
            darkCSS = {
                position: 'absolute',
                padding: 0,
                margin: 0,
                width: moduleSize,
                height: moduleSize,
                'background-color': settings.fill
            },

            $div = $('<div/>').data('qrcode', qr).css(containerCSS);

        if (settings_bgColor) {
            $div.css('background-color', settings_bgColor);
        }

        for (row = 0; row < moduleCount; row += 1) {
            for (col = 0; col < moduleCount; col += 1) {
                if (qr.isDark(row, col)) {
                    $('<div/>')
                        .css(darkCSS)
                        .css({
                            left: offset + col * moduleSize,
                            top: offset + row * moduleSize
                        })
                        .appendTo($div);
                }
            }
        }

        return $div;
    },

    createHTML = function (settings) {

        if (canvasAvailable && settings.render === 'canvas') {
            return createCanvas(settings);
        } else if (canvasAvailable && settings.render === 'image') {
            return createImage(settings);
        }

        return createDiv(settings);
    },

    // Plugin
    // ======

    // Default settings
    // ----------------
    defaults = {

        // render method: `'canvas'`, `'image'` or `'div'`
        render: 'canvas',

        // version range somewhere in 1 .. 40
        minVersion: 1,
        maxVersion: 40,

        // error correction level: `'L'`, `'M'`, `'Q'` or `'H'`
        ecLevel: 'L',

        // offset in pixel if drawn onto existing canvas
        left: 0,
        top: 0,

        // size in pixel
        size: 200,

        // code color or image element
        fill: '#000',

        // background color or image element, `null` for transparent background
        background: null,

        // content
        text: 'no text',

        // corner radius relative to module width: 0.0 .. 0.5
        radius: 0,

        // quiet zone in modules
        quiet: 0,

        // modes
        // 0: normal
        // 1: label strip
        // 2: label box
        // 3: image strip
        // 4: image box
        mode: 0,

        mSize: 0.1,
        mPosX: 0.5,
        mPosY: 0.5,

        label: 'no label',
        fontname: 'sans',
        fontcolor: '#000',

        image: null
    };

// Register the plugin
// -------------------
$.fn.qrcode = function(options) {

    var settings = $.extend({}, defaults, options);

    return this.each(function () {

        if (this.nodeName.toLowerCase() === 'canvas') {
            drawOnCanvas(this, settings);
        } else {
            $(this).append(createHTML(settings));
        }
    });
};

// jQuery.qrcode plug in code ends here


// QR Code Generator
// =================
//---------------------------------------------------------------------
//
// 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 10
     * @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.get(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) {

            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 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.get = 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.get(i) ) + QRMath.glog(e.get(j) ) );
                }
            }

            return qrPolynomial(num, 0);
        };

        _this.mod = function(e) {

            if (_this.getLength() - e.getLength() < 0) {
                return _this;
            }

            var ratio = QRMath.glog(_this.get(0) ) - QRMath.glog(e.get(0) );

            var num = new Array(_this.getLength() );
            for (var i = 0; i < _this.getLength(); i += 1) {
                num[i] = _this.get(i);
            }

            for (var i = 0; i < e.getLength(); i += 1) {
                num[i] ^= QRMath.gexp(QRMath.glog(e.get(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],

            // 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, 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.get = 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 _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;
    };

    //=====================================================================
    // 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 += '<img';
        img += '\u0020src="';
        img += 'data:image/gif;base64,';
        img += base64;
        img += '"';
        img += '\u0020width="';
        img += width;
        img += '"';
        img += '\u0020height="';
        img += height;
        img += '"';
        if (alt) {
            img += '\u0020alt="';
            img += alt;
            img += '"';
        }
        img += '/>';

        return img;
    };

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

    return qrcode;
}();


}());
