qrcode.js

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

export var qrcode = (function () {
    //---------------------------------------------------------------------
    // qrcode
    //---------------------------------------------------------------------

    /**
     * qrcode
     * @param typeNumber 1 to 40
     * @param errorCorrectionLevel 'L','M','Q','H'
     */
    var qrcode = function (typeNumber, errorCorrectionLevel) {
        var PAD0 = 0xec;
        var PAD1 = 0x11;

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

        var _this = {};

        var makeImpl = function (test, maskPattern) {
            _moduleCount = _typeNumber * 4 + 17;
            _modules = (function (moduleCount) {
                var modules = new Array(moduleCount);
                for (var row = 0; row < moduleCount; row += 1) {
                    modules[row] = new Array(moduleCount);
                    for (var col = 0; col < moduleCount; col += 1) {
                        modules[row][col] = null;
                    }
                }
                return modules;
            })(_moduleCount);

            setupPositionProbePattern(0, 0);
            setupPositionProbePattern(_moduleCount - 7, 0);
            setupPositionProbePattern(0, _moduleCount - 7);
            setupPositionAdjustPattern();
            setupTimingPattern();
            setupTypeInfo(test, maskPattern);

            if (_typeNumber >= 7) {
                setupTypeNumber(test);
            }

            if (_dataCache == null) {
                _dataCache = createData(
                    _typeNumber,
                    _errorCorrectionLevel,
                    _dataList
                );
            }

            mapData(_dataCache, maskPattern);
        };

        var setupPositionProbePattern = function (row, col) {
            for (var r = -1; r <= 7; r += 1) {
                if (row + r <= -1 || _moduleCount <= row + r) continue;

                for (var c = -1; c <= 7; c += 1) {
                    if (col + c <= -1 || _moduleCount <= col + c) continue;

                    if (
                        (0 <= r && r <= 6 && (c == 0 || c == 6)) ||
                        (0 <= c && c <= 6 && (r == 0 || r == 6)) ||
                        (2 <= r && r <= 4 && 2 <= c && c <= 4)
                    ) {
                        _modules[row + r][col + c] = true;
                    } else {
                        _modules[row + r][col + c] = false;
                    }
                }
            }
        };

        var getBestMaskPattern = function () {
            var minLostPoint = 0;
            var pattern = 0;

            for (var i = 0; i < 8; i += 1) {
                makeImpl(true, i);

                var lostPoint = QRUtil.getLostPoint(_this);

                if (i == 0 || minLostPoint > lostPoint) {
                    minLostPoint = lostPoint;
                    pattern = i;
                }
            }

            return pattern;
        };

        var setupTimingPattern = function () {
            for (var r = 8; r < _moduleCount - 8; r += 1) {
                if (_modules[r][6] != null) {
                    continue;
                }
                _modules[r][6] = r % 2 == 0;
            }

            for (var c = 8; c < _moduleCount - 8; c += 1) {
                if (_modules[6][c] != null) {
                    continue;
                }
                _modules[6][c] = c % 2 == 0;
            }
        };

        var setupPositionAdjustPattern = function () {
            var pos = QRUtil.getPatternPosition(_typeNumber);

            for (var i = 0; i < pos.length; i += 1) {
                for (var j = 0; j < pos.length; j += 1) {
                    var row = pos[i];
                    var col = pos[j];

                    if (_modules[row][col] != null) {
                        continue;
                    }

                    for (var r = -2; r <= 2; r += 1) {
                        for (var c = -2; c <= 2; c += 1) {
                            if (
                                r == -2 ||
                                r == 2 ||
                                c == -2 ||
                                c == 2 ||
                                (r == 0 && c == 0)
                            ) {
                                _modules[row + r][col + c] = true;
                            } else {
                                _modules[row + r][col + c] = false;
                            }
                        }
                    }
                }
            }
        };

        var setupTypeNumber = function (test) {
            var bits = QRUtil.getBCHTypeNumber(_typeNumber);

            for (var i = 0; i < 18; i += 1) {
                var mod = !test && ((bits >> i) & 1) == 1;
                _modules[Math.floor(i / 3)][
                    (i % 3) + _moduleCount - 8 - 3
                ] = mod;
            }

            for (var i = 0; i < 18; i += 1) {
                var mod = !test && ((bits >> i) & 1) == 1;
                _modules[(i % 3) + _moduleCount - 8 - 3][
                    Math.floor(i / 3)
                ] = mod;
            }
        };

        var setupTypeInfo = function (test, maskPattern) {
            var data = (_errorCorrectionLevel << 3) | maskPattern;
            var bits = QRUtil.getBCHTypeInfo(data);

            // vertical
            for (var i = 0; i < 15; i += 1) {
                var mod = !test && ((bits >> i) & 1) == 1;

                if (i < 6) {
                    _modules[i][8] = mod;
                } else if (i < 8) {
                    _modules[i + 1][8] = mod;
                } else {
                    _modules[_moduleCount - 15 + i][8] = mod;
                }
            }

            // horizontal
            for (var i = 0; i < 15; i += 1) {
                var mod = !test && ((bits >> i) & 1) == 1;

                if (i < 8) {
                    _modules[8][_moduleCount - i - 1] = mod;
                } else if (i < 9) {
                    _modules[8][15 - i - 1 + 1] = mod;
                } else {
                    _modules[8][15 - i - 1] = mod;
                }
            }

            // fixed module
            _modules[_moduleCount - 8][8] = !test;
        };

        var mapData = function (data, maskPattern) {
            var inc = -1;
            var row = _moduleCount - 1;
            var bitIndex = 7;
            var byteIndex = 0;
            var maskFunc = QRUtil.getMaskFunction(maskPattern);

            for (var col = _moduleCount - 1; col > 0; col -= 2) {
                if (col == 6) col -= 1;

                while (true) {
                    for (var c = 0; c < 2; c += 1) {
                        if (_modules[row][col - c] == null) {
                            var dark = false;

                            if (byteIndex < data.length) {
                                dark =
                                    ((data[byteIndex] >>> bitIndex) & 1) == 1;
                            }

                            var mask = maskFunc(row, col - c);

                            if (mask) {
                                dark = !dark;
                            }

                            _modules[row][col - c] = dark;
                            bitIndex -= 1;

                            if (bitIndex == -1) {
                                byteIndex += 1;
                                bitIndex = 7;
                            }
                        }
                    }

                    row += inc;

                    if (row < 0 || _moduleCount <= row) {
                        row -= inc;
                        inc = -inc;
                        break;
                    }
                }
            }
        };

        var createBytes = function (buffer, rsBlocks) {
            var offset = 0;

            var maxDcCount = 0;
            var maxEcCount = 0;

            var dcdata = new Array(rsBlocks.length);
            var ecdata = new Array(rsBlocks.length);

            for (var r = 0; r < rsBlocks.length; r += 1) {
                var dcCount = rsBlocks[r].dataCount;
                var ecCount = rsBlocks[r].totalCount - dcCount;

                maxDcCount = Math.max(maxDcCount, dcCount);
                maxEcCount = Math.max(maxEcCount, ecCount);

                dcdata[r] = new Array(dcCount);

                for (var i = 0; i < dcdata[r].length; i += 1) {
                    dcdata[r][i] = 0xff & buffer.getBuffer()[i + offset];
                }
                offset += dcCount;

                var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
                var rawPoly = qrPolynomial(dcdata[r], rsPoly.getLength() - 1);

                var modPoly = rawPoly.mod(rsPoly);
                ecdata[r] = new Array(rsPoly.getLength() - 1);
                for (var i = 0; i < ecdata[r].length; i += 1) {
                    var modIndex = i + modPoly.getLength() - ecdata[r].length;
                    ecdata[r][i] = modIndex >= 0 ? modPoly.getAt(modIndex) : 0;
                }
            }

            var totalCodeCount = 0;
            for (var i = 0; i < rsBlocks.length; i += 1) {
                totalCodeCount += rsBlocks[i].totalCount;
            }

            var data = new Array(totalCodeCount);
            var index = 0;

            for (var i = 0; i < maxDcCount; i += 1) {
                for (var r = 0; r < rsBlocks.length; r += 1) {
                    if (i < dcdata[r].length) {
                        data[index] = dcdata[r][i];
                        index += 1;
                    }
                }
            }

            for (var i = 0; i < maxEcCount; i += 1) {
                for (var r = 0; r < rsBlocks.length; r += 1) {
                    if (i < ecdata[r].length) {
                        data[index] = ecdata[r][i];
                        index += 1;
                    }
                }
            }

            return data;
        };

        var createData = function (typeNumber, errorCorrectionLevel, dataList) {
            var rsBlocks = QRRSBlock.getRSBlocks(
                typeNumber,
                errorCorrectionLevel
            );

            var buffer = qrBitBuffer();

            for (var i = 0; i < dataList.length; i += 1) {
                var data = dataList[i];
                buffer.put(data.getMode(), 4);
                buffer.put(
                    data.getLength(),
                    QRUtil.getLengthInBits(data.getMode(), typeNumber)
                );
                data.write(buffer);
            }

            // calc num max data.
            var totalDataCount = 0;
            for (var i = 0; i < rsBlocks.length; i += 1) {
                totalDataCount += rsBlocks[i].dataCount;
            }

            if (buffer.getLengthInBits() > totalDataCount * 8) {
                throw (
                    "code length overflow. (" +
                    buffer.getLengthInBits() +
                    ">" +
                    totalDataCount * 8 +
                    ")"
                );
            }

            // end code
            if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
                buffer.put(0, 4);
            }

            // padding
            while (buffer.getLengthInBits() % 8 != 0) {
                buffer.putBit(false);
            }

            // padding
            while (true) {
                if (buffer.getLengthInBits() >= totalDataCount * 8) {
                    break;
                }
                buffer.put(PAD0, 8);

                if (buffer.getLengthInBits() >= totalDataCount * 8) {
                    break;
                }
                buffer.put(PAD1, 8);
            }

            return createBytes(buffer, rsBlocks);
        };

        _this.addData = function (data, mode) {
            mode = mode || "Byte";

            var newData = null;

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

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

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

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

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

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

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

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

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

                _typeNumber = typeNumber;
            }

            makeImpl(false, getBestMaskPattern());
        };

        _this.createTableTag = function (cellSize, margin) {
            cellSize = cellSize || 2;
            margin = typeof margin == "undefined" ? cellSize * 4 : margin;

            var qrHtml = "";

            qrHtml += '<table style="';
            qrHtml += " border-width: 0px; border-style: none;";
            qrHtml += " border-collapse: collapse;";
            qrHtml += " padding: 0px; margin: " + margin + "px;";
            qrHtml += '">';
            qrHtml += "<tbody>";

            for (var r = 0; r < _this.getModuleCount(); r += 1) {
                qrHtml += "<tr>";

                for (var c = 0; c < _this.getModuleCount(); c += 1) {
                    qrHtml += '<td style="';
                    qrHtml += " border-width: 0px; border-style: none;";
                    qrHtml += " border-collapse: collapse;";
                    qrHtml += " padding: 0px; margin: 0px;";
                    qrHtml += " width: " + cellSize + "px;";
                    qrHtml += " height: " + cellSize + "px;";
                    qrHtml += " background-color: ";
                    qrHtml += _this.isDark(r, c) ? "#000000" : "#ffffff";
                    qrHtml += ";";
                    qrHtml += '"/>';
                }

                qrHtml += "</tr>";
            }

            qrHtml += "</tbody>";
            qrHtml += "</table>";

            return qrHtml;
        };

        _this.createSvgTag = function (cellSize, margin, alt, title) {
            var opts = {};
            if (typeof arguments[0] == "object") {
                // Called by options.
                opts = arguments[0];
                // overwrite cellSize and margin.
                cellSize = opts.cellSize;
                margin = opts.margin;
                alt = opts.alt;
                title = opts.title;
            }

            cellSize = cellSize || 2;
            margin = typeof margin == "undefined" ? cellSize * 4 : margin;

            // Compose alt property surrogate
            alt = typeof alt === "string" ? { text: alt } : alt || {};
            alt.text = alt.text || null;
            alt.id = alt.text ? alt.id || "qrcode-description" : null;

            // Compose title property surrogate
            title = typeof title === "string" ? { text: title } : title || {};
            title.text = title.text || null;
            title.id = title.text ? title.id || "qrcode-title" : null;

            var size = _this.getModuleCount() * cellSize + margin * 2;
            var c,
                mc,
                r,
                mr,
                qrSvg = "",
                rect;

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

            qrSvg += '<svg version="1.1" xmlns="http://www.w3.org/2000/svg"';
            qrSvg += !opts.scalable
                ? ' width="' + size + 'px" height="' + size + 'px"'
                : "";
            qrSvg += ' viewBox="0 0 ' + size + " " + size + '" ';
            qrSvg += ' preserveAspectRatio="xMinYMin meet"';
            qrSvg +=
                title.text || alt.text
                    ? ' role="img" aria-labelledby="' +
                      escapeXml([title.id, alt.id].join(" ").trim()) +
                      '"'
                    : "";
            qrSvg += ">";
            qrSvg += title.text
                ? '<title id="' +
                  escapeXml(title.id) +
                  '">' +
                  escapeXml(title.text) +
                  "</title>"
                : "";
            qrSvg += alt.text
                ? '<description id="' +
                  escapeXml(alt.id) +
                  '">' +
                  escapeXml(alt.text) +
                  "</description>"
                : "";
            qrSvg +=
                '<rect width="100%" height="100%" fill="white" cx="0" cy="0"/>';
            qrSvg += '<path d="';

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

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

            return qrSvg;
        };

        _this.createDataURL = function (cellSize, margin) {
            cellSize = cellSize || 2;
            margin = typeof margin == "undefined" ? cellSize * 4 : margin;

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

            return createDataURL(size, size, function (x, y) {
                if (min <= x && x < max && min <= y && y < max) {
                    var c = Math.floor((x - min) / cellSize);
                    var r = Math.floor((y - min) / cellSize);
                    return _this.isDark(r, c) ? 0 : 1;
                } else {
                    return 1;
                }
            });
        };

        _this.createImgTag = function (cellSize, margin, alt) {
            cellSize = cellSize || 2;
            margin = typeof margin == "undefined" ? cellSize * 4 : margin;

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

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

            return img;
        };

        var escapeXml = function (s) {
            var escaped = "";
            for (var i = 0; i < s.length; i += 1) {
                var c = s.charAt(i);
                switch (c) {
                    case "<":
                        escaped += "&lt;";
                        break;
                    case ">":
                        escaped += "&gt;";
                        break;
                    case "&":
                        escaped += "&amp;";
                        break;
                    case '"':
                        escaped += "&quot;";
                        break;
                    default:
                        escaped += c;
                        break;
                }
            }
            return escaped;
        };

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

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

            var y, x, r1, r2, p;

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

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

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

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

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

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

                ascii += "\n";
            }

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

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

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

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

            cellSize -= 1;
            margin = typeof margin == "undefined" ? cellSize * 2 : margin;

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

            var y, x, r, p;

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

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

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

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

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

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

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

        return _this;
    };

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

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

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

    //---------------------------------------------------------------------
    // qrcode.createStringToBytes
    //---------------------------------------------------------------------

    /**
     * @param unicodeData base64 string of byte array.
     * [16bit Unicode],[16bit Bytes], ...
     * @param numChars
     */
    qrcode.createStringToBytes = function (unicodeData, numChars) {
        // create conversion map.

        var unicodeMap = (function () {
            var bin = base64DecodeInputStream(unicodeData);
            var read = function () {
                var b = bin.read();
                if (b == -1) throw "eof";
                return b;
            };

            var count = 0;
            var unicodeMap = {};
            while (true) {
                var b0 = bin.read();
                if (b0 == -1) break;
                var b1 = read();
                var b2 = read();
                var b3 = read();
                var k = String.fromCharCode((b0 << 8) | b1);
                var v = (b2 << 8) | b3;
                unicodeMap[k] = v;
                count += 1;
            }
            if (count != numChars) {
                throw count + " != " + numChars;
            }

            return unicodeMap;
        })();

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

        return function (s) {
            var bytes = [];
            for (var i = 0; i < s.length; i += 1) {
                var c = s.charCodeAt(i);
                if (c < 128) {
                    bytes.push(c);
                } else {
                    var b = unicodeMap[s.charAt(i)];
                    if (typeof b == "number") {
                        if ((b & 0xff) == b) {
                            // 1byte
                            bytes.push(b);
                        } else {
                            // 2bytes
                            bytes.push(b >>> 8);
                            bytes.push(b & 0xff);
                        }
                    } else {
                        bytes.push(unknownChar);
                    }
                }
            }
            return bytes;
        };
    };

    //---------------------------------------------------------------------
    // QRMode
    //---------------------------------------------------------------------

    var QRMode = {
        MODE_NUMBER: 1 << 0,
        MODE_ALPHA_NUM: 1 << 1,
        MODE_8BIT_BYTE: 1 << 2,
        MODE_KANJI: 1 << 3,
    };

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

    var QRErrorCorrectionLevel = {
        L: 1,
        M: 0,
        Q: 3,
        H: 2,
    };

    //---------------------------------------------------------------------
    // QRMaskPattern
    //---------------------------------------------------------------------

    var QRMaskPattern = {
        PATTERN000: 0,
        PATTERN001: 1,
        PATTERN010: 2,
        PATTERN011: 3,
        PATTERN100: 4,
        PATTERN101: 5,
        PATTERN110: 6,
        PATTERN111: 7,
    };

    //---------------------------------------------------------------------
    // QRUtil
    //---------------------------------------------------------------------

    var QRUtil = (function () {
        var PATTERN_POSITION_TABLE = [
            [],
            [6, 18],
            [6, 22],
            [6, 26],
            [6, 30],
            [6, 34],
            [6, 22, 38],
            [6, 24, 42],
            [6, 26, 46],
            [6, 28, 50],
            [6, 30, 54],
            [6, 32, 58],
            [6, 34, 62],
            [6, 26, 46, 66],
            [6, 26, 48, 70],
            [6, 26, 50, 74],
            [6, 30, 54, 78],
            [6, 30, 56, 82],
            [6, 30, 58, 86],
            [6, 34, 62, 90],
            [6, 28, 50, 72, 94],
            [6, 26, 50, 74, 98],
            [6, 30, 54, 78, 102],
            [6, 28, 54, 80, 106],
            [6, 32, 58, 84, 110],
            [6, 30, 58, 86, 114],
            [6, 34, 62, 90, 118],
            [6, 26, 50, 74, 98, 122],
            [6, 30, 54, 78, 102, 126],
            [6, 26, 52, 78, 104, 130],
            [6, 30, 56, 82, 108, 134],
            [6, 34, 60, 86, 112, 138],
            [6, 30, 58, 86, 114, 142],
            [6, 34, 62, 90, 118, 146],
            [6, 30, 54, 78, 102, 126, 150],
            [6, 24, 50, 76, 102, 128, 154],
            [6, 28, 54, 80, 106, 132, 158],
            [6, 32, 58, 84, 110, 136, 162],
            [6, 26, 54, 82, 110, 138, 166],
            [6, 30, 58, 86, 114, 142, 170],
        ];
        var G15 =
            (1 << 10) |
            (1 << 8) |
            (1 << 5) |
            (1 << 4) |
            (1 << 2) |
            (1 << 1) |
            (1 << 0);
        var G18 =
            (1 << 12) |
            (1 << 11) |
            (1 << 10) |
            (1 << 9) |
            (1 << 8) |
            (1 << 5) |
            (1 << 2) |
            (1 << 0);
        var G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1);

        var _this = {};

        var getBCHDigit = function (data) {
            var digit = 0;
            while (data != 0) {
                digit += 1;
                data >>>= 1;
            }
            return digit;
        };

        _this.getBCHTypeInfo = function (data) {
            var d = data << 10;
            while (getBCHDigit(d) - getBCHDigit(G15) >= 0) {
                d ^= G15 << (getBCHDigit(d) - getBCHDigit(G15));
            }
            return ((data << 10) | d) ^ G15_MASK;
        };

        _this.getBCHTypeNumber = function (data) {
            var d = data << 12;
            while (getBCHDigit(d) - getBCHDigit(G18) >= 0) {
                d ^= G18 << (getBCHDigit(d) - getBCHDigit(G18));
            }
            return (data << 12) | d;
        };

        _this.getPatternPosition = function (typeNumber) {
            return PATTERN_POSITION_TABLE[typeNumber - 1];
        };

        _this.getMaskFunction = function (maskPattern) {
            switch (maskPattern) {
                case QRMaskPattern.PATTERN000:
                    return function (i, j) {
                        return (i + j) % 2 == 0;
                    };
                case QRMaskPattern.PATTERN001:
                    return function (i, j) {
                        return i % 2 == 0;
                    };
                case QRMaskPattern.PATTERN010:
                    return function (i, j) {
                        return j % 3 == 0;
                    };
                case QRMaskPattern.PATTERN011:
                    return function (i, j) {
                        return (i + j) % 3 == 0;
                    };
                case QRMaskPattern.PATTERN100:
                    return function (i, j) {
                        return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;
                    };
                case QRMaskPattern.PATTERN101:
                    return function (i, j) {
                        return ((i * j) % 2) + ((i * j) % 3) == 0;
                    };
                case QRMaskPattern.PATTERN110:
                    return function (i, j) {
                        return (((i * j) % 2) + ((i * j) % 3)) % 2 == 0;
                    };
                case QRMaskPattern.PATTERN111:
                    return function (i, j) {
                        return (((i * j) % 3) + ((i + j) % 2)) % 2 == 0;
                    };

                default:
                    throw "bad maskPattern:" + maskPattern;
            }
        };

        _this.getErrorCorrectPolynomial = function (errorCorrectLength) {
            var a = qrPolynomial([1], 0);
            for (var i = 0; i < errorCorrectLength; i += 1) {
                a = a.multiply(qrPolynomial([1, QRMath.gexp(i)], 0));
            }
            return a;
        };

        _this.getLengthInBits = function (mode, type) {
            if (1 <= type && type < 10) {
                // 1 - 9

                switch (mode) {
                    case QRMode.MODE_NUMBER:
                        return 10;
                    case QRMode.MODE_ALPHA_NUM:
                        return 9;
                    case QRMode.MODE_8BIT_BYTE:
                        return 8;
                    case QRMode.MODE_KANJI:
                        return 8;
                    default:
                        throw "mode:" + mode;
                }
            } else if (type < 27) {
                // 10 - 26

                switch (mode) {
                    case QRMode.MODE_NUMBER:
                        return 12;
                    case QRMode.MODE_ALPHA_NUM:
                        return 11;
                    case QRMode.MODE_8BIT_BYTE:
                        return 16;
                    case QRMode.MODE_KANJI:
                        return 10;
                    default:
                        throw "mode:" + mode;
                }
            } else if (type < 41) {
                // 27 - 40

                switch (mode) {
                    case QRMode.MODE_NUMBER:
                        return 14;
                    case QRMode.MODE_ALPHA_NUM:
                        return 13;
                    case QRMode.MODE_8BIT_BYTE:
                        return 16;
                    case QRMode.MODE_KANJI:
                        return 12;
                    default:
                        throw "mode:" + mode;
                }
            } else {
                throw "type:" + type;
            }
        };

        _this.getLostPoint = function (qrcode) {
            var moduleCount = qrcode.getModuleCount();

            var lostPoint = 0;

            // LEVEL1

            for (var row = 0; row < moduleCount; row += 1) {
                for (var col = 0; col < moduleCount; col += 1) {
                    var sameCount = 0;
                    var dark = qrcode.isDark(row, col);

                    for (var r = -1; r <= 1; r += 1) {
                        if (row + r < 0 || moduleCount <= row + r) {
                            continue;
                        }

                        for (var c = -1; c <= 1; c += 1) {
                            if (col + c < 0 || moduleCount <= col + c) {
                                continue;
                            }

                            if (r == 0 && c == 0) {
                                continue;
                            }

                            if (dark == qrcode.isDark(row + r, col + c)) {
                                sameCount += 1;
                            }
                        }
                    }

                    if (sameCount > 5) {
                        lostPoint += 3 + sameCount - 5;
                    }
                }
            }

            // LEVEL2

            for (var row = 0; row < moduleCount - 1; row += 1) {
                for (var col = 0; col < moduleCount - 1; col += 1) {
                    var count = 0;
                    if (qrcode.isDark(row, col)) count += 1;
                    if (qrcode.isDark(row + 1, col)) count += 1;
                    if (qrcode.isDark(row, col + 1)) count += 1;
                    if (qrcode.isDark(row + 1, col + 1)) count += 1;
                    if (count == 0 || count == 4) {
                        lostPoint += 3;
                    }
                }
            }

            // LEVEL3

            for (var row = 0; row < moduleCount; row += 1) {
                for (var col = 0; col < moduleCount - 6; col += 1) {
                    if (
                        qrcode.isDark(row, col) &&
                        !qrcode.isDark(row, col + 1) &&
                        qrcode.isDark(row, col + 2) &&
                        qrcode.isDark(row, col + 3) &&
                        qrcode.isDark(row, col + 4) &&
                        !qrcode.isDark(row, col + 5) &&
                        qrcode.isDark(row, col + 6)
                    ) {
                        lostPoint += 40;
                    }
                }
            }

            for (var col = 0; col < moduleCount; col += 1) {
                for (var row = 0; row < moduleCount - 6; row += 1) {
                    if (
                        qrcode.isDark(row, col) &&
                        !qrcode.isDark(row + 1, col) &&
                        qrcode.isDark(row + 2, col) &&
                        qrcode.isDark(row + 3, col) &&
                        qrcode.isDark(row + 4, col) &&
                        !qrcode.isDark(row + 5, col) &&
                        qrcode.isDark(row + 6, col)
                    ) {
                        lostPoint += 40;
                    }
                }
            }

            // LEVEL4

            var darkCount = 0;

            for (var col = 0; col < moduleCount; col += 1) {
                for (var row = 0; row < moduleCount; row += 1) {
                    if (qrcode.isDark(row, col)) {
                        darkCount += 1;
                    }
                }
            }

            var ratio =
                Math.abs((100 * darkCount) / moduleCount / moduleCount - 50) /
                5;
            lostPoint += ratio * 10;

            return lostPoint;
        };

        return _this;
    })();

    //---------------------------------------------------------------------
    // QRMath
    //---------------------------------------------------------------------

    var QRMath = (function () {
        var EXP_TABLE = new Array(256);
        var LOG_TABLE = new Array(256);

        // initialize tables
        for (var i = 0; i < 8; i += 1) {
            EXP_TABLE[i] = 1 << i;
        }
        for (var i = 8; i < 256; i += 1) {
            EXP_TABLE[i] =
                EXP_TABLE[i - 4] ^
                EXP_TABLE[i - 5] ^
                EXP_TABLE[i - 6] ^
                EXP_TABLE[i - 8];
        }
        for (var i = 0; i < 255; i += 1) {
            LOG_TABLE[EXP_TABLE[i]] = i;
        }

        var _this = {};

        _this.glog = function (n) {
            if (n < 1) {
                throw "glog(" + n + ")";
            }

            return LOG_TABLE[n];
        };

        _this.gexp = function (n) {
            while (n < 0) {
                n += 255;
            }

            while (n >= 256) {
                n -= 255;
            }

            return EXP_TABLE[n];
        };

        return _this;
    })();

    //---------------------------------------------------------------------
    // qrPolynomial
    //---------------------------------------------------------------------

    function qrPolynomial(num, shift) {
        if (typeof num.length == "undefined") {
            throw num.length + "/" + shift;
        }

        var _num = (function () {
            var offset = 0;
            while (offset < num.length && num[offset] == 0) {
                offset += 1;
            }
            var _num = new Array(num.length - offset + shift);
            for (var i = 0; i < num.length - offset; i += 1) {
                _num[i] = num[i + offset];
            }
            return _num;
        })();

        var _this = {};

        _this.getAt = function (index) {
            return _num[index];
        };

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

        _this.multiply = function (e) {
            var num = new Array(_this.getLength() + e.getLength() - 1);

            for (var i = 0; i < _this.getLength(); i += 1) {
                for (var j = 0; j < e.getLength(); j += 1) {
                    num[i + j] ^= QRMath.gexp(
                        QRMath.glog(_this.getAt(i)) + QRMath.glog(e.getAt(j))
                    );
                }
            }

            return qrPolynomial(num, 0);
        };

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

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

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

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

            // recursive call
            return qrPolynomial(num, 0).mod(e);
        };

        return _this;
    }

    //---------------------------------------------------------------------
    // QRRSBlock
    //---------------------------------------------------------------------

    var QRRSBlock = (function () {
        var RS_BLOCK_TABLE = [
            // L
            // M
            // Q
            // H

            // 1
            [1, 26, 19],
            [1, 26, 16],
            [1, 26, 13],
            [1, 26, 9],

            // 2
            [1, 44, 34],
            [1, 44, 28],
            [1, 44, 22],
            [1, 44, 16],

            // 3
            [1, 70, 55],
            [1, 70, 44],
            [2, 35, 17],
            [2, 35, 13],

            // 4
            [1, 100, 80],
            [2, 50, 32],
            [2, 50, 24],
            [4, 25, 9],

            // 5
            [1, 134, 108],
            [2, 67, 43],
            [2, 33, 15, 2, 34, 16],
            [2, 33, 11, 2, 34, 12],

            // 6
            [2, 86, 68],
            [4, 43, 27],
            [4, 43, 19],
            [4, 43, 15],

            // 7
            [2, 98, 78],
            [4, 49, 31],
            [2, 32, 14, 4, 33, 15],
            [4, 39, 13, 1, 40, 14],

            // 8
            [2, 121, 97],
            [2, 60, 38, 2, 61, 39],
            [4, 40, 18, 2, 41, 19],
            [4, 40, 14, 2, 41, 15],

            // 9
            [2, 146, 116],
            [3, 58, 36, 2, 59, 37],
            [4, 36, 16, 4, 37, 17],
            [4, 36, 12, 4, 37, 13],

            // 10
            [2, 86, 68, 2, 87, 69],
            [4, 69, 43, 1, 70, 44],
            [6, 43, 19, 2, 44, 20],
            [6, 43, 15, 2, 44, 16],

            // 11
            [4, 101, 81],
            [1, 80, 50, 4, 81, 51],
            [4, 50, 22, 4, 51, 23],
            [3, 36, 12, 8, 37, 13],

            // 12
            [2, 116, 92, 2, 117, 93],
            [6, 58, 36, 2, 59, 37],
            [4, 46, 20, 6, 47, 21],
            [7, 42, 14, 4, 43, 15],

            // 13
            [4, 133, 107],
            [8, 59, 37, 1, 60, 38],
            [8, 44, 20, 4, 45, 21],
            [12, 33, 11, 4, 34, 12],

            // 14
            [3, 145, 115, 1, 146, 116],
            [4, 64, 40, 5, 65, 41],
            [11, 36, 16, 5, 37, 17],
            [11, 36, 12, 5, 37, 13],

            // 15
            [5, 109, 87, 1, 110, 88],
            [5, 65, 41, 5, 66, 42],
            [5, 54, 24, 7, 55, 25],
            [11, 36, 12, 7, 37, 13],

            // 16
            [5, 122, 98, 1, 123, 99],
            [7, 73, 45, 3, 74, 46],
            [15, 43, 19, 2, 44, 20],
            [3, 45, 15, 13, 46, 16],

            // 17
            [1, 135, 107, 5, 136, 108],
            [10, 74, 46, 1, 75, 47],
            [1, 50, 22, 15, 51, 23],
            [2, 42, 14, 17, 43, 15],

            // 18
            [5, 150, 120, 1, 151, 121],
            [9, 69, 43, 4, 70, 44],
            [17, 50, 22, 1, 51, 23],
            [2, 42, 14, 19, 43, 15],

            // 19
            [3, 141, 113, 4, 142, 114],
            [3, 70, 44, 11, 71, 45],
            [17, 47, 21, 4, 48, 22],
            [9, 39, 13, 16, 40, 14],

            // 20
            [3, 135, 107, 5, 136, 108],
            [3, 67, 41, 13, 68, 42],
            [15, 54, 24, 5, 55, 25],
            [15, 43, 15, 10, 44, 16],

            // 21
            [4, 144, 116, 4, 145, 117],
            [17, 68, 42],
            [17, 50, 22, 6, 51, 23],
            [19, 46, 16, 6, 47, 17],

            // 22
            [2, 139, 111, 7, 140, 112],
            [17, 74, 46],
            [7, 54, 24, 16, 55, 25],
            [34, 37, 13],

            // 23
            [4, 151, 121, 5, 152, 122],
            [4, 75, 47, 14, 76, 48],
            [11, 54, 24, 14, 55, 25],
            [16, 45, 15, 14, 46, 16],

            // 24
            [6, 147, 117, 4, 148, 118],
            [6, 73, 45, 14, 74, 46],
            [11, 54, 24, 16, 55, 25],
            [30, 46, 16, 2, 47, 17],

            // 25
            [8, 132, 106, 4, 133, 107],
            [8, 75, 47, 13, 76, 48],
            [7, 54, 24, 22, 55, 25],
            [22, 45, 15, 13, 46, 16],

            // 26
            [10, 142, 114, 2, 143, 115],
            [19, 74, 46, 4, 75, 47],
            [28, 50, 22, 6, 51, 23],
            [33, 46, 16, 4, 47, 17],

            // 27
            [8, 152, 122, 4, 153, 123],
            [22, 73, 45, 3, 74, 46],
            [8, 53, 23, 26, 54, 24],
            [12, 45, 15, 28, 46, 16],

            // 28
            [3, 147, 117, 10, 148, 118],
            [3, 73, 45, 23, 74, 46],
            [4, 54, 24, 31, 55, 25],
            [11, 45, 15, 31, 46, 16],

            // 29
            [7, 146, 116, 7, 147, 117],
            [21, 73, 45, 7, 74, 46],
            [1, 53, 23, 37, 54, 24],
            [19, 45, 15, 26, 46, 16],

            // 30
            [5, 145, 115, 10, 146, 116],
            [19, 75, 47, 10, 76, 48],
            [15, 54, 24, 25, 55, 25],
            [23, 45, 15, 25, 46, 16],

            // 31
            [13, 145, 115, 3, 146, 116],
            [2, 74, 46, 29, 75, 47],
            [42, 54, 24, 1, 55, 25],
            [23, 45, 15, 28, 46, 16],

            // 32
            [17, 145, 115],
            [10, 74, 46, 23, 75, 47],
            [10, 54, 24, 35, 55, 25],
            [19, 45, 15, 35, 46, 16],

            // 33
            [17, 145, 115, 1, 146, 116],
            [14, 74, 46, 21, 75, 47],
            [29, 54, 24, 19, 55, 25],
            [11, 45, 15, 46, 46, 16],

            // 34
            [13, 145, 115, 6, 146, 116],
            [14, 74, 46, 23, 75, 47],
            [44, 54, 24, 7, 55, 25],
            [59, 46, 16, 1, 47, 17],

            // 35
            [12, 151, 121, 7, 152, 122],
            [12, 75, 47, 26, 76, 48],
            [39, 54, 24, 14, 55, 25],
            [22, 45, 15, 41, 46, 16],

            // 36
            [6, 151, 121, 14, 152, 122],
            [6, 75, 47, 34, 76, 48],
            [46, 54, 24, 10, 55, 25],
            [2, 45, 15, 64, 46, 16],

            // 37
            [17, 152, 122, 4, 153, 123],
            [29, 74, 46, 14, 75, 47],
            [49, 54, 24, 10, 55, 25],
            [24, 45, 15, 46, 46, 16],

            // 38
            [4, 152, 122, 18, 153, 123],
            [13, 74, 46, 32, 75, 47],
            [48, 54, 24, 14, 55, 25],
            [42, 45, 15, 32, 46, 16],

            // 39
            [20, 147, 117, 4, 148, 118],
            [40, 75, 47, 7, 76, 48],
            [43, 54, 24, 22, 55, 25],
            [10, 45, 15, 67, 46, 16],

            // 40
            [19, 148, 118, 6, 149, 119],
            [18, 75, 47, 31, 76, 48],
            [34, 54, 24, 34, 55, 25],
            [20, 45, 15, 61, 46, 16],
        ];

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

        var _this = {};

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

        _this.getRSBlocks = function (typeNumber, errorCorrectionLevel) {
            var rsBlock = getRsBlockTable(typeNumber, errorCorrectionLevel);

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

            var length = rsBlock.length / 3;

            var list = [];

            for (var i = 0; i < length; i += 1) {
                var count = rsBlock[i * 3 + 0];
                var totalCount = rsBlock[i * 3 + 1];
                var dataCount = rsBlock[i * 3 + 2];

                for (var j = 0; j < count; j += 1) {
                    list.push(qrRSBlock(totalCount, dataCount));
                }
            }

            return list;
        };

        return _this;
    })();

    //---------------------------------------------------------------------
    // qrBitBuffer
    //---------------------------------------------------------------------

    var qrBitBuffer = function () {
        var _buffer = [];
        var _length = 0;

        var _this = {};

        _this.getBuffer = function () {
            return _buffer;
        };

        _this.getAt = function (index) {
            var bufIndex = Math.floor(index / 8);
            return ((_buffer[bufIndex] >>> (7 - (index % 8))) & 1) == 1;
        };

        _this.put = function (num, length) {
            for (var i = 0; i < length; i += 1) {
                _this.putBit(((num >>> (length - i - 1)) & 1) == 1);
            }
        };

        _this.getLengthInBits = function () {
            return _length;
        };

        _this.putBit = function (bit) {
            var bufIndex = Math.floor(_length / 8);
            if (_buffer.length <= bufIndex) {
                _buffer.push(0);
            }

            if (bit) {
                _buffer[bufIndex] |= 0x80 >>> _length % 8;
            }

            _length += 1;
        };

        return _this;
    };

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

    var qrNumber = function (data) {
        var _mode = QRMode.MODE_NUMBER;
        var _data = data;

        var _this = {};

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

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

        _this.write = function (buffer) {
            var data = _data;

            var i = 0;

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

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

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

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

        return _this;
    };

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

    var qrAlphaNum = function (data) {
        var _mode = QRMode.MODE_ALPHA_NUM;
        var _data = data;

        var _this = {};

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

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

        _this.write = function (buffer) {
            var s = _data;

            var i = 0;

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

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

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

        return _this;
    };

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

    var qr8BitByte = function (data) {
        var _mode = QRMode.MODE_8BIT_BYTE;
        var _data = data;
        var _bytes = qrcode.stringToBytes(data);

        var _this = {};

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

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

        _this.write = function (buffer) {
            for (var i = 0; i < _bytes.length; i += 1) {
                buffer.put(_bytes[i], 8);
            }
        };

        return _this;
    };

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

    var qrKanji = function (data) {
        var _mode = QRMode.MODE_KANJI;
        var _data = data;

        var stringToBytes = qrcode.stringToBytesFuncs["SJIS"];
        if (!stringToBytes) {
            throw "sjis not supported.";
        }
        !(function (c, code) {
            // self test for sjis support.
            var test = stringToBytes(c);
            if (test.length != 2 || ((test[0] << 8) | test[1]) != code) {
                throw "sjis not supported.";
            }
        })("\u53cb", 0x9746);

        var _bytes = stringToBytes(data);

        var _this = {};

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

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

        _this.write = function (buffer) {
            var data = _bytes;

            var i = 0;

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

                if (0x8140 <= c && c <= 0x9ffc) {
                    c -= 0x8140;
                } else if (0xe040 <= c && c <= 0xebbf) {
                    c -= 0xc140;
                } else {
                    throw "illegal char at " + (i + 1) + "/" + c;
                }

                c = ((c >>> 8) & 0xff) * 0xc0 + (c & 0xff);

                buffer.put(c, 13);

                i += 2;
            }

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

        return _this;
    };

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

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

    var byteArrayOutputStream = function () {
        var _bytes = [];

        var _this = {};

        _this.writeByte = function (b) {
            _bytes.push(b & 0xff);
        };

        _this.writeShort = function (i) {
            _this.writeByte(i);
            _this.writeByte(i >>> 8);
        };

        _this.writeBytes = function (b, off, len) {
            off = off || 0;
            len = len || b.length;
            for (var i = 0; i < len; i += 1) {
                _this.writeByte(b[i + off]);
            }
        };

        _this.writeString = function (s) {
            for (var i = 0; i < s.length; i += 1) {
                _this.writeByte(s.charCodeAt(i));
            }
        };

        _this.toByteArray = function () {
            return _bytes;
        };

        _this.toString = function () {
            var s = "";
            s += "[";
            for (var i = 0; i < _bytes.length; i += 1) {
                if (i > 0) {
                    s += ",";
                }
                s += _bytes[i];
            }
            s += "]";
            return s;
        };

        return _this;
    };

    //---------------------------------------------------------------------
    // base64EncodeOutputStream
    //---------------------------------------------------------------------

    var base64EncodeOutputStream = function () {
        var _buffer = 0;
        var _buflen = 0;
        var _length = 0;
        var _base64 = "";

        var _this = {};

        var writeEncoded = function (b) {
            _base64 += String.fromCharCode(encode(b & 0x3f));
        };

        var encode = function (n) {
            if (n < 0) {
                // error.
            } else if (n < 26) {
                return 0x41 + n;
            } else if (n < 52) {
                return 0x61 + (n - 26);
            } else if (n < 62) {
                return 0x30 + (n - 52);
            } else if (n == 62) {
                return 0x2b;
            } else if (n == 63) {
                return 0x2f;
            }
            throw "n:" + n;
        };

        _this.writeByte = function (n) {
            _buffer = (_buffer << 8) | (n & 0xff);
            _buflen += 8;
            _length += 1;

            while (_buflen >= 6) {
                writeEncoded(_buffer >>> (_buflen - 6));
                _buflen -= 6;
            }
        };

        _this.flush = function () {
            if (_buflen > 0) {
                writeEncoded(_buffer << (6 - _buflen));
                _buffer = 0;
                _buflen = 0;
            }

            if (_length % 3 != 0) {
                // padding
                var padlen = 3 - (_length % 3);
                for (var i = 0; i < padlen; i += 1) {
                    _base64 += "=";
                }
            }
        };

        _this.toString = function () {
            return _base64;
        };

        return _this;
    };

    //---------------------------------------------------------------------
    // base64DecodeInputStream
    //---------------------------------------------------------------------

    var base64DecodeInputStream = function (str) {
        var _str = str;
        var _pos = 0;
        var _buffer = 0;
        var _buflen = 0;

        var _this = {};

        _this.read = function () {
            while (_buflen < 8) {
                if (_pos >= _str.length) {
                    if (_buflen == 0) {
                        return -1;
                    }
                    throw "unexpected end of file./" + _buflen;
                }

                var c = _str.charAt(_pos);
                _pos += 1;

                if (c == "=") {
                    _buflen = 0;
                    return -1;
                } else if (c.match(/^\s$/)) {
                    // ignore if whitespace.
                    continue;
                }

                _buffer = (_buffer << 6) | decode(c.charCodeAt(0));
                _buflen += 6;
            }

            var n = (_buffer >>> (_buflen - 8)) & 0xff;
            _buflen -= 8;
            return n;
        };

        var decode = function (c) {
            if (0x41 <= c && c <= 0x5a) {
                return c - 0x41;
            } else if (0x61 <= c && c <= 0x7a) {
                return c - 0x61 + 26;
            } else if (0x30 <= c && c <= 0x39) {
                return c - 0x30 + 52;
            } else if (c == 0x2b) {
                return 62;
            } else if (c == 0x2f) {
                return 63;
            } else {
                throw "c:" + c;
            }
        };

        return _this;
    };

    //---------------------------------------------------------------------
    // gifImage (B/W)
    //---------------------------------------------------------------------

    var gifImage = function (width, height) {
        var _width = width;
        var _height = height;
        var _data = new Array(width * height);

        var _this = {};

        _this.setPixel = function (x, y, pixel) {
            _data[y * _width + x] = pixel;
        };

        _this.write = function (out) {
            //---------------------------------
            // GIF Signature

            out.writeString("GIF87a");

            //---------------------------------
            // Screen Descriptor

            out.writeShort(_width);
            out.writeShort(_height);

            out.writeByte(0x80); // 2bit
            out.writeByte(0);
            out.writeByte(0);

            //---------------------------------
            // Global Color Map

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

            // white
            out.writeByte(0xff);
            out.writeByte(0xff);
            out.writeByte(0xff);

            //---------------------------------
            // Image Descriptor

            out.writeString(",");
            out.writeShort(0);
            out.writeShort(0);
            out.writeShort(_width);
            out.writeShort(_height);
            out.writeByte(0);

            //---------------------------------
            // Local Color Map

            //---------------------------------
            // Raster Data

            var lzwMinCodeSize = 2;
            var raster = getLZWRaster(lzwMinCodeSize);

            out.writeByte(lzwMinCodeSize);

            var offset = 0;

            while (raster.length - offset > 255) {
                out.writeByte(255);
                out.writeBytes(raster, offset, 255);
                offset += 255;
            }

            out.writeByte(raster.length - offset);
            out.writeBytes(raster, offset, raster.length - offset);
            out.writeByte(0x00);

            //---------------------------------
            // GIF Terminator
            out.writeString(";");
        };

        var bitOutputStream = function (out) {
            var _out = out;
            var _bitLength = 0;
            var _bitBuffer = 0;

            var _this = {};

            _this.write = function (data, length) {
                if (data >>> length != 0) {
                    throw "length over";
                }

                while (_bitLength + length >= 8) {
                    _out.writeByte(0xff & ((data << _bitLength) | _bitBuffer));
                    length -= 8 - _bitLength;
                    data >>>= 8 - _bitLength;
                    _bitBuffer = 0;
                    _bitLength = 0;
                }

                _bitBuffer = (data << _bitLength) | _bitBuffer;
                _bitLength = _bitLength + length;
            };

            _this.flush = function () {
                if (_bitLength > 0) {
                    _out.writeByte(_bitBuffer);
                }
            };

            return _this;
        };

        var getLZWRaster = function (lzwMinCodeSize) {
            var clearCode = 1 << lzwMinCodeSize;
            var endCode = (1 << lzwMinCodeSize) + 1;
            var bitLength = lzwMinCodeSize + 1;

            // Setup LZWTable
            var table = lzwTable();

            for (var i = 0; i < clearCode; i += 1) {
                table.add(String.fromCharCode(i));
            }
            table.add(String.fromCharCode(clearCode));
            table.add(String.fromCharCode(endCode));

            var byteOut = byteArrayOutputStream();
            var bitOut = bitOutputStream(byteOut);

            // clear code
            bitOut.write(clearCode, bitLength);

            var dataIndex = 0;

            var s = String.fromCharCode(_data[dataIndex]);
            dataIndex += 1;

            while (dataIndex < _data.length) {
                var c = String.fromCharCode(_data[dataIndex]);
                dataIndex += 1;

                if (table.contains(s + c)) {
                    s = s + c;
                } else {
                    bitOut.write(table.indexOf(s), bitLength);

                    if (table.size() < 0xfff) {
                        if (table.size() == 1 << bitLength) {
                            bitLength += 1;
                        }

                        table.add(s + c);
                    }

                    s = c;
                }
            }

            bitOut.write(table.indexOf(s), bitLength);

            // end code
            bitOut.write(endCode, bitLength);

            bitOut.flush();

            return byteOut.toByteArray();
        };

        var lzwTable = function () {
            var _map = {};
            var _size = 0;

            var _this = {};

            _this.add = function (key) {
                if (_this.contains(key)) {
                    throw "dup key:" + key;
                }
                _map[key] = _size;
                _size += 1;
            };

            _this.size = function () {
                return _size;
            };

            _this.indexOf = function (key) {
                return _map[key];
            };

            _this.contains = function (key) {
                return typeof _map[key] != "undefined";
            };

            return _this;
        };

        return _this;
    };

    var createDataURL = function (width, height, getPixel) {
        var gif = gifImage(width, height);
        for (var y = 0; y < height; y += 1) {
            for (var x = 0; x < width; x += 1) {
                gif.setPixel(x, y, getPixel(x, y));
            }
        }

        var b = byteArrayOutputStream();
        gif.write(b);

        var base64 = base64EncodeOutputStream();
        var bytes = b.toByteArray();
        for (var i = 0; i < bytes.length; i += 1) {
            base64.writeByte(bytes[i]);
        }
        base64.flush();

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

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

    return qrcode;
})();

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