OwlCyberSecurity - MANAGER

Edit File: qr.js

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

var qrcode = function() {

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

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

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

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

var _this = {};

var makeImpl = function(test, maskPattern) {

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

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

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

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

mapData(_dataCache, maskPattern);
        };

var setupPositionProbePattern = function(row, col) {

for (var r = -1; r <= 7; r += 1) {

if (row + r <= -1 || _moduleCount <= row + r) continue;

for (var c = -1; c <= 7; c += 1) {

if (col + c <= -1 || _moduleCount <= col + c) continue;

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

var getBestMaskPattern = function() {

var minLostPoint = 0;
            var pattern = 0;

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

makeImpl(true, i);

var lostPoint = QRUtil.getLostPoint(_this);

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

return pattern;
        };

var setupTimingPattern = function() {

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

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

var setupPositionAdjustPattern = function() {

var pos = QRUtil.getPatternPosition(_typeNumber);

for (var i = 0; i < pos.length; i += 1) {

for (var j = 0; j < pos.length; j += 1) {

var row = pos[i];
                    var col = pos[j];

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

for (var r = -2; r <= 2; r += 1) {

for (var c = -2; c <= 2; c += 1) {

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

var setupTypeNumber = function(test) {

var bits = QRUtil.getBCHTypeNumber(_typeNumber);

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

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

var setupTypeInfo = function(test, maskPattern) {

var data = (_errorCorrectionLevel << 3) | maskPattern;
            var bits = QRUtil.getBCHTypeInfo(data);

// vertical
            for (var i = 0; i < 15; i += 1) {

var mod = (!test && ( (bits >> i) & 1) == 1);

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

// horizontal
            for (var i = 0; i < 15; i += 1) {

var mod = (!test && ( (bits >> i) & 1) == 1);

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

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

var mapData = function(data, maskPattern) {

var inc = -1;
            var row = _moduleCount - 1;
            var bitIndex = 7;
            var byteIndex = 0;
            var maskFunc = QRUtil.getMaskFunction(maskPattern);

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

if (col == 6) col -= 1;

while (true) {

for (var c = 0; c < 2; c += 1) {

if (_modules[row][col - c] == null) {

var dark = false;

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

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

if (mask) {
                                dark = !dark;
                            }

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

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

row += inc;

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

var createBytes = function(buffer, rsBlocks) {

var offset = 0;

var maxDcCount = 0;
            var maxEcCount = 0;

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

for (var r = 0; r < rsBlocks.length; r += 1) {

var dcCount = rsBlocks[r].dataCount;
                var ecCount = rsBlocks[r].totalCount - dcCount;

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

dcdata[r] = new Array(dcCount);

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

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

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

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

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

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

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

return data;
        };

var createData = function(typeNumber, errorCorrectionLevel, dataList) {

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

var buffer = qrBitBuffer();

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

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

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

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

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

// padding
            while (true) {

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

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

return createBytes(buffer, rsBlocks);
        };

_this.addData = function(data, mode) {

mode = mode || 'Byte';

var newData = null;

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

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

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

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

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

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

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

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

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

_typeNumber = typeNumber;
            }

makeImpl(false, getBestMaskPattern() );
        };

_this.createTableTag = function(cellSize, margin) {

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

var qrHtml = '';

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

for (var r = 0; r < _this.getModuleCount(); r += 1) {

qrHtml += '<tr>';

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

qrHtml += '</tr>';
            }

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

return qrHtml;
        };

_this.createSvgTag = function(cellSize, margin, alt, title) {

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

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

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

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

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

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

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

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

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

return qrSvg;
        };

_this.createDataURL = function(cellSize, margin) {

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

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

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

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

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

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

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

return img;
        };

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

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

var y, x, r1, r2, p;

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

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

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

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

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

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

ascii += '\n';
            }

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

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

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

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

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

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

var y, x, r, p;

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

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

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

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

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

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

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

return _this;
    };

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

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

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

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

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

// create conversion map.

var unicodeMap = function() {

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

return unicodeMap;
        }();

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

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

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

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

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

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

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

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

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

var QRUtil = function() {

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

var _this = {};

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

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

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

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

_this.getMaskFunction = function(maskPattern) {

switch (maskPattern) {

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

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

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

_this.getLengthInBits = function(mode, type) {

if (1 <= type && type < 10) {

// 1 - 9

switch(mode) {
                    case QRMode.MODE_NUMBER    : return 10;
                    case QRMode.MODE_ALPHA_NUM : return 9;
                    case QRMode.MODE_8BIT_BYTE : return 8;
                    case QRMode.MODE_KANJI     : return 8;
                    default :
                        throw 'mode:' + mode;
                }

} else if (type < 27) {

// 10 - 26

switch(mode) {
                    case QRMode.MODE_NUMBER    : return 12;
                    case QRMode.MODE_ALPHA_NUM : return 11;
                    case QRMode.MODE_8BIT_BYTE : return 16;
                    case QRMode.MODE_KANJI     : return 10;
                    default :
                        throw 'mode:' + mode;
                }

} else if (type < 41) {

// 27 - 40

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

} else {
                throw 'type:' + type;
            }
        };

_this.getLostPoint = function(qrcode) {

var moduleCount = qrcode.getModuleCount();

var lostPoint = 0;

// LEVEL1

for (var row = 0; row < moduleCount; row += 1) {
                for (var col = 0; col < moduleCount; col += 1) {

var sameCount = 0;
                    var dark = qrcode.isDark(row, col);

for (var r = -1; r <= 1; r += 1) {

if (row + r < 0 || moduleCount <= row + r) {
                            continue;
                        }

for (var c = -1; c <= 1; c += 1) {

if (col + c < 0 || moduleCount <= col + c) {
                                continue;
                            }

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

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

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

// LEVEL2

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

// LEVEL3

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

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

// LEVEL4

var darkCount = 0;

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

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

return lostPoint;
        };

return _this;
    }();

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

var QRMath = function() {

var EXP_TABLE = new Array(256);
        var LOG_TABLE = new Array(256);

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

var _this = {};

_this.glog = function(n) {

if (n < 1) {
                throw 'glog(' + n + ')';
            }

return LOG_TABLE[n];
        };

_this.gexp = function(n) {

while (n < 0) {
                n += 255;
            }

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

return EXP_TABLE[n];
        };

return _this;
    }();

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

function qrPolynomial(num, shift) {

if (typeof num.length == 'undefined') {
            throw num.length + '/' + shift;
        }

var _this = {};

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

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

_this.multiply = function(e) {

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

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

return qrPolynomial(num, 0);
        };

_this.mod = function(e) {

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

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

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

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

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

return _this;
    };

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

var QRRSBlock = function() {

var RS_BLOCK_TABLE = [

// L
            // M
            // Q
            // H

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

var _this = {};

var getRsBlockTable = function(typeNumber, errorCorrectionLevel) {

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

_this.getRSBlocks = function(typeNumber, errorCorrectionLevel) {

var rsBlock = getRsBlockTable(typeNumber, errorCorrectionLevel);

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

var length = rsBlock.length / 3;

var list = [];

for (var i = 0; i < length; i += 1) {

var count = rsBlock[i * 3 + 0];
                var totalCount = rsBlock[i * 3 + 1];
                var dataCount = rsBlock[i * 3 + 2];

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

return list;
        };

return _this;
    }();

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

var qrBitBuffer = function() {

var _buffer = [];
        var _length = 0;

var _this = {};

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

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

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

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

_this.putBit = function(bit) {

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

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

_length += 1;
        };

return _this;
    };

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

var qrNumber = function(data) {

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

var _this = {};

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

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

_this.write = function(buffer) {

var data = _data;

var i = 0;

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

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

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

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

return _this;
    };

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

var qrAlphaNum = function(data) {

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

var _this = {};

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

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

_this.write = function(buffer) {

var s = _data;

var i = 0;

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

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

var getCode = function(c) {

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

return _this;
    };

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

var qr8BitByte = function(data) {

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

var _this = {};

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

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

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

return _this;
    };

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

var qrKanji = function(data) {

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

var _bytes = stringToBytes(data);

var _this = {};

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

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

_this.write = function(buffer) {

var data = _bytes;

var i = 0;

while (i + 1 < data.length) {

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

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

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

buffer.put(c, 13);

i += 2;
            }

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

return _this;
    };

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

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

var byteArrayOutputStream = function() {

var _bytes = [];

var _this = {};

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

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

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

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

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

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

return _this;
    };

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

var base64EncodeOutputStream = function() {

var _buffer = 0;
        var _buflen = 0;
        var _length = 0;
        var _base64 = '';

var _this = {};

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

_this.writeByte = function(n) {

_buffer = (_buffer << 8) | (n & 0xff);
            _buflen += 8;
            _length += 1;

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

_this.flush = function() {

if (_buflen > 0) {
                writeEncoded(_buffer << (6 - _buflen) );
                _buffer = 0;
                _buflen = 0;
            }

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

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

return _this;
    };

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

var base64DecodeInputStream = function(str) {

var _str = str;
        var _pos = 0;
        var _buffer = 0;
        var _buflen = 0;

var _this = {};

_this.read = function() {

while (_buflen < 8) {

if (_pos >= _str.length) {
                    if (_buflen == 0) {
                        return -1;
                    }
                    throw 'unexpected end of file./' + _buflen;
                }

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

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

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

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

return _this;
    };

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

var gifImage = function(width, height) {

var _width = width;
        var _height = height;
        var _data = new Array(width * height);

var _this = {};

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

_this.write = function(out) {

//---------------------------------
            // GIF Signature

out.writeString('GIF87a');

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

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

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

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

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

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

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

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

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

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

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

out.writeByte(lzwMinCodeSize);

var offset = 0;

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

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

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

var bitOutputStream = function(out) {

var _out = out;
            var _bitLength = 0;
            var _bitBuffer = 0;

var _this = {};

_this.write = function(data, length) {

if ( (data >>> length) != 0) {
                    throw 'length over';
                }

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

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

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

return _this;
        };

var getLZWRaster = function(lzwMinCodeSize) {

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

// Setup LZWTable
            var table = lzwTable();

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

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

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

var dataIndex = 0;

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

while (dataIndex < _data.length) {

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

if (table.contains(s + c) ) {

s = s + c;

} else {

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

if (table.size() < 0xfff) {

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

table.add(s + c);
                    }

s = c;
                }
            }

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

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

bitOut.flush();

return byteOut.toByteArray();
        };

var lzwTable = function() {

var _map = {};
            var _size = 0;

var _this = {};

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

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

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

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

return _this;
        };

return _this;
    };

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

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

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

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

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

return qrcode;
}();

// multibyte support
!function() {

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

}();