微信小程序使用weapp-qrcode生成二维码

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<canvas style="width:108rpx;height:108rpx; canvas-id='qrcode'></canvas>

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//  weapp-qrcode.js在最后面
const QR = require('../../utils/weapp-qrcode.js');


// 生成二维码createQrcode(qrCodeLink) {var imgData = QR.drawImg(qrCodeLink, {typeNumber: 4,          // 密度errorCorrectLevel: 'L', // 纠错等级size: 800,              // 白色边框})let list = this.data.listlist.forEach(n => {list[this.data.count].path = imgData  //  临时路径存到list里})this.setData({list})this.setData({count: this.data.count+1})var imgUrl = list[this.data.count].urlif (list.length >= this.data.count) {this.createQrcode(imgUrl)}}

weapp-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
//
//---------------------------------------------------------------------//---------------微信小程序基于base64生成二维码插件修改-------------------
/** @Modified: Pudon* @demoURL: https://github.com/Pudon/weapp-qrcode* @Date: 2018-09-11 14:00:05 * @Last Modified by: Pudon* @Last Modified time: 2018-09-12 16:33:19*/
//---------------------------------------------------------------------/*** qrcode* @param typeNumber 1 to 40* @param errorCorrectLevel 'L','M','Q','H'*/
var qrcode = function(typeNumber, errorCorrectLevel) {var PAD0 = 0xEC;var PAD1 = 0x11;var _typeNumber = typeNumber;var _errorCorrectLevel = QRErrorCorrectLevel[errorCorrectLevel];var _modules = null;var _moduleCount = 0;var _dataCache = null;var _dataList = new Array();var _this = {};var makeImpl = function(test, maskPattern) {_moduleCount = _typeNumber * 4 + 17;
_modules = function(moduleCount) {var modules = new Array(moduleCount);for (var row = 0; row < moduleCount; row += 1) {modules[row] = new Array(moduleCount);for (var col = 0; col < moduleCount; col += 1) {modules[row][col] = null;}}return modules;
}(_moduleCount);setupPositionProbePattern(0, 0);
setupPositionProbePattern(_moduleCount - 7, 0);
setupPositionProbePattern(0, _moduleCount - 7);
setupPositionAdjustPattern();
setupTimingPattern();
setupTypeInfo(test, maskPattern);if (_typeNumber >= 7) {setupTypeNumber(test);
}if (_dataCache == null) {_dataCache = createData(_typeNumber, _errorCorrectLevel, _dataList);
}mapData(_dataCache, maskPattern);};var setupPositionProbePattern = function(row, col) {for (var r = -1; r <= 7; r += 1) {if (row + r <= -1 || _moduleCount <= row + r) continue;for (var c = -1; c <= 7; c += 1) {if (col + c <= -1 || _moduleCount <= col + c) continue;if ( (0 <= r && r <= 6 && (c == 0 || c == 6) )|| (0 <= c && c <= 6 && (r == 0 || r == 6) )|| (2 <= r && r <= 4 && 2 <= c && c <= 4) ) {_modules[row + r][col + c] = true;} else {_modules[row + r][col + c] = false;}}
}};var getBestMaskPattern = function() {var minLostPoint = 0;
var pattern = 0;for (var i = 0; i < 8; i += 1) {makeImpl(true, i);var lostPoint = QRUtil.getLostPoint(_this);if (i == 0 || minLostPoint > lostPoint) {minLostPoint = lostPoint;pattern = i;}
}return pattern;};var setupTimingPattern = function() {for (var r = 8; r < _moduleCount - 8; r += 1) {if (_modules[r][6] != null) {continue;}_modules[r][6] = (r % 2 == 0);
}for (var c = 8; c < _moduleCount - 8; c += 1) {if (_modules[6][c] != null) {continue;}_modules[6][c] = (c % 2 == 0);
}};var setupPositionAdjustPattern = function() {var pos = QRUtil.getPatternPosition(_typeNumber);for (var i = 0; i < pos.length; i += 1) {for (var j = 0; j < pos.length; j += 1) {var row = pos[i];var col = pos[j];if (_modules[row][col] != null) {continue;}for (var r = -2; r <= 2; r += 1) {for (var c = -2; c <= 2; c += 1) {if (r == -2 || r == 2 || c == -2 || c == 2|| (r == 0 && c == 0) ) {_modules[row + r][col + c] = true;} else {_modules[row + r][col + c] = false;}}}}
}};var setupTypeNumber = function(test) {var bits = QRUtil.getBCHTypeNumber(_typeNumber);for (var i = 0; i < 18; i += 1) {var mod = (!test && ( (bits >> i) & 1) == 1);_modules[Math.floor(i / 3)][i % 3 + _moduleCount - 8 - 3] = mod;
}for (var i = 0; i < 18; i += 1) {var mod = (!test && ( (bits >> i) & 1) == 1);_modules[i % 3 + _moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
}};var setupTypeInfo = function(test, maskPattern) {var data = (_errorCorrectLevel << 3) | maskPattern;
var bits = QRUtil.getBCHTypeInfo(data);// vertical
for (var i = 0; i < 15; i += 1) {var mod = (!test && ( (bits >> i) & 1) == 1);if (i < 6) {_modules[i][8] = mod;} else if (i < 8) {_modules[i + 1][8] = mod;} else {_modules[_moduleCount - 15 + i][8] = mod;}
}// horizontal
for (var i = 0; i < 15; i += 1) {var mod = (!test && ( (bits >> i) & 1) == 1);if (i < 8) {_modules[8][_moduleCount - i - 1] = mod;} else if (i < 9) {_modules[8][15 - i - 1 + 1] = mod;} else {_modules[8][15 - i - 1] = mod;}
}// fixed module
_modules[_moduleCount - 8][8] = (!test);};var mapData = function(data, maskPattern) {var inc = -1;
var row = _moduleCount - 1;
var bitIndex = 7;
var byteIndex = 0;
var maskFunc = QRUtil.getMaskFunction(maskPattern);for (var col = _moduleCount - 1; col > 0; col -= 2) {if (col == 6) col -= 1;while (true) {for (var c = 0; c < 2; c += 1) {if (_modules[row][col - c] == null) {var dark = false;if (byteIndex < data.length) {dark = ( ( (data[byteIndex] >>> bitIndex) & 1) == 1);}var mask = maskFunc(row, col - c);if (mask) {dark = !dark;}_modules[row][col - c] = dark;bitIndex -= 1;if (bitIndex == -1) {byteIndex += 1;bitIndex = 7;}}}row += inc;if (row < 0 || _moduleCount <= row) {row -= inc;inc = -inc;break;}}
}};var createBytes = function(buffer, rsBlocks) {var offset = 0;var maxDcCount = 0;
var maxEcCount = 0;var dcdata = new Array(rsBlocks.length);
var ecdata = new Array(rsBlocks.length);for (var r = 0; r < rsBlocks.length; r += 1) {var dcCount = rsBlocks[r].dataCount;var ecCount = rsBlocks[r].totalCount - dcCount;maxDcCount = Math.max(maxDcCount, dcCount);maxEcCount = Math.max(maxEcCount, ecCount);dcdata[r] = new Array(dcCount);for (var i = 0; i < dcdata[r].length; i += 1) {dcdata[r][i] = 0xff & buffer.getBuffer()[i + offset];}offset += dcCount;var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);var rawPoly = qrPolynomial(dcdata[r], rsPoly.getLength() - 1);var modPoly = rawPoly.mod(rsPoly);ecdata[r] = new Array(rsPoly.getLength() - 1);for (var i = 0; i < ecdata[r].length; i += 1) {var modIndex = i + modPoly.getLength() - ecdata[r].length;ecdata[r][i] = (modIndex >= 0)? modPoly.getAt(modIndex) : 0;}
}var totalCodeCount = 0;
for (var i = 0; i < rsBlocks.length; i += 1) {totalCodeCount += rsBlocks[i].totalCount;
}var data = new Array(totalCodeCount);
var index = 0;for (var i = 0; i < maxDcCount; i += 1) {for (var r = 0; r < rsBlocks.length; r += 1) {if (i < dcdata[r].length) {data[index] = dcdata[r][i];index += 1;}}
}for (var i = 0; i < maxEcCount; i += 1) {for (var r = 0; r < rsBlocks.length; r += 1) {if (i < ecdata[r].length) {data[index] = ecdata[r][i];index += 1;}}
}return data;};var createData = function(typeNumber, errorCorrectLevel, dataList) {var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);var buffer = qrBitBuffer();for (var i = 0; i < dataList.length; i += 1) {var data = dataList[i];buffer.put(data.getMode(), 4);buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber) );data.write(buffer);
}// calc num max data.
var totalDataCount = 0;
for (var i = 0; i < rsBlocks.length; i += 1) {totalDataCount += rsBlocks[i].dataCount;
}if (buffer.getLengthInBits() > totalDataCount * 8) {throw new Error('code length overflow. ('+ buffer.getLengthInBits()+ '>'+ totalDataCount * 8+ ')');
}// end code
if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {buffer.put(0, 4);
}// padding
while (buffer.getLengthInBits() % 8 != 0) {buffer.putBit(false);
}// padding
while (true) {if (buffer.getLengthInBits() >= totalDataCount * 8) {break;}buffer.put(PAD0, 8);if (buffer.getLengthInBits() >= totalDataCount * 8) {break;}buffer.put(PAD1, 8);
}return createBytes(buffer, rsBlocks);};_this.addData = function(data) {
var newData = qr8BitByte(data);
_dataList.push(newData);
_dataCache = null;};_this.isDark = function(row, col) {
if (row < 0 || _moduleCount <= row || col < 0 || _moduleCount <= col) {throw new Error(row + ',' + col);
}
return _modules[row][col];};_this.getModuleCount = function() {
return _moduleCount;};_this.make = function() {
makeImpl(false, getBestMaskPattern() );};_this.createTableTag = function(cellSize, margin) {cellSize = cellSize || 2;
margin = (typeof margin == 'undefined')? cellSize * 4 : margin;var qrHtml = '';qrHtml += '<table style="';
qrHtml += ' border-width: 0px; border-style: none;';
qrHtml += ' border-collapse: collapse;';
qrHtml += ' padding: 0px; margin: ' + margin + 'px;';
qrHtml += '">';
qrHtml += '<tbody>';for (var r = 0; r < _this.getModuleCount(); r += 1) {qrHtml += '<tr>';for (var c = 0; c < _this.getModuleCount(); c += 1) {qrHtml += '<td style="';qrHtml += ' border-width: 0px; border-style: none;';qrHtml += ' border-collapse: collapse;';qrHtml += ' padding: 0px; margin: 0px;';qrHtml += ' width: ' + cellSize + 'px;';qrHtml += ' height: ' + cellSize + 'px;';qrHtml += ' background-color: ';qrHtml += _this.isDark(r, c)? '#000000' : '#ffffff';qrHtml += ';';qrHtml += '"/>';}qrHtml += '</tr>';
}qrHtml += '</tbody>';
qrHtml += '</table>';return qrHtml;};_this.createImgTag = function(cellSize, margin, size) {cellSize = cellSize || 2;
margin = (typeof margin == 'undefined')? cellSize * 4 : margin;var min = margin;
var max = _this.getModuleCount() * cellSize + margin;return createImgTag(size, size, function(x, y) {if (min <= x && x < max && min <= y && y < max) {var c = Math.floor( (x - min) / cellSize);var r = Math.floor( (y - min) / cellSize);return _this.isDark(r, c)? 0 : 1;} else {return 1;}
} );};return _this;
};//---------------------------------------------------------------------
// qrcode.stringToBytes
//---------------------------------------------------------------------qrcode.stringToBytes = function(s) {var bytes = new Array();for (var i = 0; i < s.length; i += 1) {
var c = s.charCodeAt(i);
bytes.push(c & 0xff);}return bytes;
};//---------------------------------------------------------------------
// qrcode.createStringToBytes
//---------------------------------------------------------------------/**
* @param unicodeData base64 string of byte array.
* [16bit Unicode],[16bit Bytes], ...
* @param numChars
*/
qrcode.createStringToBytes = function(unicodeData, numChars) {// create conversion map.var unicodeMap = function() {var bin = base64DecodeInputStream(unicodeData);
var read = function() {var b = bin.read();if (b == -1) throw new Error();return b;
};var count = 0;
var unicodeMap = {};
while (true) {var b0 = bin.read();if (b0 == -1) break;var b1 = read();var b2 = read();var b3 = read();var k = String.fromCharCode( (b0 << 8) | b1);var v = (b2 << 8) | b3;unicodeMap[k] = v;count += 1;
}
if (count != numChars) {throw new Error(count + ' != ' + numChars);
}return unicodeMap;}();var unknownChar = '?'.charCodeAt(0);return function(s) {
var bytes = new Array();
for (var i = 0; i < s.length; i += 1) {var c = s.charCodeAt(i);if (c < 128) {bytes.push(c);} else {var b = unicodeMap[s.charAt(i)];if (typeof b == 'number') {if ( (b & 0xff) == b) {// 1bytebytes.push(b);} else {// 2bytesbytes.push(b >>> 8);bytes.push(b & 0xff);}} else {bytes.push(unknownChar);}}
}
return bytes;};
};//---------------------------------------------------------------------
// QRMode
//---------------------------------------------------------------------var QRMode = {MODE_NUMBER :		1 << 0,MODE_ALPHA_NUM : 	1 << 1,MODE_8BIT_BYTE : 	1 << 2,MODE_KANJI :		1 << 3
};//---------------------------------------------------------------------
// QRErrorCorrectLevel
//---------------------------------------------------------------------var QRErrorCorrectLevel = {L : 1,M : 0,Q : 3,H : 2
};//---------------------------------------------------------------------
// QRMaskPattern
//---------------------------------------------------------------------var QRMaskPattern = {PATTERN000 : 0,PATTERN001 : 1,PATTERN010 : 2,PATTERN011 : 3,PATTERN100 : 4,PATTERN101 : 5,PATTERN110 : 6,PATTERN111 : 7
};//---------------------------------------------------------------------
// QRUtil
//---------------------------------------------------------------------var QRUtil = function() {var PATTERN_POSITION_TABLE = [
[],
[6, 18],
[6, 22],
[6, 26],
[6, 30],
[6, 34],
[6, 22, 38],
[6, 24, 42],
[6, 26, 46],
[6, 28, 50],
[6, 30, 54],
[6, 32, 58],
[6, 34, 62],
[6, 26, 46, 66],
[6, 26, 48, 70],
[6, 26, 50, 74],
[6, 30, 54, 78],
[6, 30, 56, 82],
[6, 30, 58, 86],
[6, 34, 62, 90],
[6, 28, 50, 72, 94],
[6, 26, 50, 74, 98],
[6, 30, 54, 78, 102],
[6, 28, 54, 80, 106],
[6, 32, 58, 84, 110],
[6, 30, 58, 86, 114],
[6, 34, 62, 90, 118],
[6, 26, 50, 74, 98, 122],
[6, 30, 54, 78, 102, 126],
[6, 26, 52, 78, 104, 130],
[6, 30, 56, 82, 108, 134],
[6, 34, 60, 86, 112, 138],
[6, 30, 58, 86, 114, 142],
[6, 34, 62, 90, 118, 146],
[6, 30, 54, 78, 102, 126, 150],
[6, 24, 50, 76, 102, 128, 154],
[6, 28, 54, 80, 106, 132, 158],
[6, 32, 58, 84, 110, 136, 162],
[6, 26, 54, 82, 110, 138, 166],
[6, 30, 58, 86, 114, 142, 170]];var G15 = (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0);var G18 = (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0);var G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1);var _this = {};var getBCHDigit = function(data) {
var digit = 0;
while (data != 0) {digit += 1;data >>>= 1;
}
return digit;};_this.getBCHTypeInfo = function(data) {
var d = data << 10;
while (getBCHDigit(d) - getBCHDigit(G15) >= 0) {d ^= (G15 << (getBCHDigit(d) - getBCHDigit(G15) ) );
}
return ( (data << 10) | d) ^ G15_MASK;};_this.getBCHTypeNumber = function(data) {
var d = data << 12;
while (getBCHDigit(d) - getBCHDigit(G18) >= 0) {d ^= (G18 << (getBCHDigit(d) - getBCHDigit(G18) ) );
}
return (data << 12) | d;};_this.getPatternPosition = function(typeNumber) {
return PATTERN_POSITION_TABLE[typeNumber - 1];};_this.getMaskFunction = function(maskPattern) {switch (maskPattern) {case QRMaskPattern.PATTERN000 :return function(i, j) { return (i + j) % 2 == 0; };case QRMaskPattern.PATTERN001 :return function(i, j) { return i % 2 == 0; };case QRMaskPattern.PATTERN010 :return function(i, j) { return j % 3 == 0; };case QRMaskPattern.PATTERN011 :return function(i, j) { return (i + j) % 3 == 0; };case QRMaskPattern.PATTERN100 :return function(i, j) { return (Math.floor(i / 2) + Math.floor(j / 3) ) % 2 == 0; };case QRMaskPattern.PATTERN101 :return function(i, j) { return (i * j) % 2 + (i * j) % 3 == 0; };case QRMaskPattern.PATTERN110 :return function(i, j) { return ( (i * j) % 2 + (i * j) % 3) % 2 == 0; };case QRMaskPattern.PATTERN111 :return function(i, j) { return ( (i * j) % 3 + (i + j) % 2) % 2 == 0; };default :throw new Error('bad maskPattern:' + maskPattern);
}};_this.getErrorCorrectPolynomial = function(errorCorrectLength) {
var a = qrPolynomial([1], 0);
for (var i = 0; i < errorCorrectLength; i += 1) {a = a.multiply(qrPolynomial([1, QRMath.gexp(i)], 0) );
}
return a;};_this.getLengthInBits = function(mode, type) {if (1 <= type && type < 10) {// 1 - 9switch(mode) {case QRMode.MODE_NUMBER 	: return 10;case QRMode.MODE_ALPHA_NUM 	: return 9;case QRMode.MODE_8BIT_BYTE	: return 8;case QRMode.MODE_KANJI		: return 8;default :throw new Error('mode:' + mode);}} else if (type < 27) {// 10 - 26switch(mode) {case QRMode.MODE_NUMBER 	: return 12;case QRMode.MODE_ALPHA_NUM 	: return 11;case QRMode.MODE_8BIT_BYTE	: return 16;case QRMode.MODE_KANJI		: return 10;default :throw new Error('mode:' + mode);}} else if (type < 41) {// 27 - 40switch(mode) {case QRMode.MODE_NUMBER 	: return 14;case QRMode.MODE_ALPHA_NUM	: return 13;case QRMode.MODE_8BIT_BYTE	: return 16;case QRMode.MODE_KANJI		: return 12;default :throw new Error('mode:' + mode);}} else {throw new Error('type:' + type);
}};_this.getLostPoint = function(qrcode) {var moduleCount = qrcode.getModuleCount();var lostPoint = 0;// LEVEL1for (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);}}
};// LEVEL2for (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;}}
}// LEVEL3for (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;}}
}// LEVEL4var 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 tablesfor (var i = 0; i < 8; i += 1) {
EXP_TABLE[i] = 1 << i;}for (var i = 8; i < 256; i += 1) {
EXP_TABLE[i] = EXP_TABLE[i - 4]^ EXP_TABLE[i - 5]^ EXP_TABLE[i - 6]^ EXP_TABLE[i - 8];}for (var i = 0; i < 255; i += 1) {
LOG_TABLE[EXP_TABLE[i] ] = i;}var _this = {};_this.glog = function(n) {if (n < 1) {throw new Error('glog(' + n + ')');
}return LOG_TABLE[n];};_this.gexp = function(n) {while (n < 0) {n += 255;
}while (n >= 256) {n -= 255;
}return EXP_TABLE[n];};return _this;
}();//---------------------------------------------------------------------
// qrPolynomial
//---------------------------------------------------------------------function qrPolynomial(num, shift) {if (typeof num.length == 'undefined') {
throw new Error(num.length + '/' + shift);}var _num = function() {
var offset = 0;
while (offset < num.length && num[offset] == 0) {offset += 1;
}
var _num = new Array(num.length - offset + shift);
for (var i = 0; i < num.length - offset; i += 1) {_num[i] = num[i + offset];
}
return _num;}();var _this = {};_this.getAt = function(index) {
return _num[index];};_this.getLength = function() {
return _num.length;};_this.multiply = function(e) {var num = new Array(_this.getLength() + e.getLength() - 1);for (var i = 0; i < _this.getLength(); i += 1) {for (var j = 0; j < e.getLength(); j += 1) {num[i + j] ^= QRMath.gexp(QRMath.glog(_this.getAt(i) ) + QRMath.glog(e.getAt(j) ) );}
}return qrPolynomial(num, 0);};_this.mod = function(e) {if (_this.getLength() - e.getLength() < 0) {return _this;
}var ratio = QRMath.glog(_this.getAt(0) ) - QRMath.glog(e.getAt(0) );var num = new Array(_this.getLength() );
for (var i = 0; i < _this.getLength(); i += 1) {num[i] = _this.getAt(i);
}for (var i = 0; i < e.getLength(); i += 1) {num[i] ^= QRMath.gexp(QRMath.glog(e.getAt(i) ) + ratio);
}// recursive call
return qrPolynomial(num, 0).mod(e);};return _this;
};//---------------------------------------------------------------------
// QRRSBlock
//---------------------------------------------------------------------var QRRSBlock = function() {// [1: [L, M, Q, H], ..]var RS_BLOCK_TABLE=[[1,26,19],[1,26,16],[1,26,13],[1,26,9],[1,44,34],[1,44,28],[1,44,22],[1,44,16],[1,70,55],[1,70,44],[2,35,17],[2,35,13],[1,100,80],[2,50,32],[2,50,24],[4,25,9],[1,134,108],[2,67,43],[2,33,15,2,34,16],[2,33,11,2,34,12],[2,86,68],[4,43,27],[4,43,19],[4,43,15],[2,98,78],[4,49,31],[2,32,14,4,33,15],[4,39,13,1,40,14],[2,121,97],[2,60,38,2,61,39],[4,40,18,2,41,19],[4,40,14,2,41,15],[2,146,116],[3,58,36,2,59,37],[4,36,16,4,37,17],[4,36,12,4,37,13],[2,86,68,2,87,69],[4,69,43,1,70,44],[6,43,19,2,44,20],[6,43,15,2,44,16],[4,101,81],[1,80,50,4,81,51],[4,50,22,4,51,23],[3,36,12,8,37,13],[2,116,92,2,117,93],[6,58,36,2,59,37],[4,46,20,6,47,21],[7,42,14,4,43,15],[4,133,107],[8,59,37,1,60,38],[8,44,20,4,45,21],[12,33,11,4,34,12],[3,145,115,1,146,116],[4,64,40,5,65,41],[11,36,16,5,37,17],[11,36,12,5,37,13],[5,109,87,1,110,88],[5,65,41,5,66,42],[5,54,24,7,55,25],[11,36,12],[5,122,98,1,123,99],[7,73,45,3,74,46],[15,43,19,2,44,20],[3,45,15,13,46,16],[1,135,107,5,136,108],[10,74,46,1,75,47],[1,50,22,15,51,23],[2,42,14,17,43,15],[5,150,120,1,151,121],[9,69,43,4,70,44],[17,50,22,1,51,23],[2,42,14,19,43,15],[3,141,113,4,142,114],[3,70,44,11,71,45],[17,47,21,4,48,22],[9,39,13,16,40,14],[3,135,107,5,136,108],[3,67,41,13,68,42],[15,54,24,5,55,25],[15,43,15,10,44,16],[4,144,116,4,145,117],[17,68,42],[17,50,22,6,51,23],[19,46,16,6,47,17],[2,139,111,7,140,112],[17,74,46],[7,54,24,16,55,25],[34,37,13],[4,151,121,5,152,122],[4,75,47,14,76,48],[11,54,24,14,55,25],[16,45,15,14,46,16],[6,147,117,4,148,118],[6,73,45,14,74,46],[11,54,24,16,55,25],[30,46,16,2,47,17],[8,132,106,4,133,107],[8,75,47,13,76,48],[7,54,24,22,55,25],[22,45,15,13,46,16],[10,142,114,2,143,115],[19,74,46,4,75,47],[28,50,22,6,51,23],[33,46,16,4,47,17],[8,152,122,4,153,123],[22,73,45,3,74,46],[8,53,23,26,54,24],[12,45,15,28,46,16],[3,147,117,10,148,118],[3,73,45,23,74,46],[4,54,24,31,55,25],[11,45,15,31,46,16],[7,146,116,7,147,117],[21,73,45,7,74,46],[1,53,23,37,54,24],[19,45,15,26,46,16],[5,145,115,10,146,116],[19,75,47,10,76,48],[15,54,24,25,55,25],[23,45,15,25,46,16],[13,145,115,3,146,116],[2,74,46,29,75,47],[42,54,24,1,55,25],[23,45,15,28,46,16],[17,145,115],[10,74,46,23,75,47],[10,54,24,35,55,25],[19,45,15,35,46,16],[17,145,115,1,146,116],[14,74,46,21,75,47],[29,54,24,19,55,25],[11,45,15,46,46,16],[13,145,115,6,146,116],[14,74,46,23,75,47],[44,54,24,7,55,25],[59,46,16,1,47,17],[12,151,121,7,152,122],[12,75,47,26,76,48],[39,54,24,14,55,25],[22,45,15,41,46,16],[6,151,121,14,152,122],[6,75,47,34,76,48],[46,54,24,10,55,25],[2,45,15,64,46,16],[17,152,122,4,153,123],[29,74,46,14,75,47],[49,54,24,10,55,25],[24,45,15,46,46,16],[4,152,122,18,153,123],[13,74,46,32,75,47],[48,54,24,14,55,25],[42,45,15,32,46,16],[20,147,117,4,148,118],[40,75,47,7,76,48],[43,54,24,22,55,25],[10,45,15,67,46,16],[19,148,118,6,149,119],[18,75,47,31,76,48],[34,54,24,34,55,25],[20,45,15,61,46,16]];var qrRSBlock = function(totalCount, dataCount) {
var _this = {};
_this.totalCount = totalCount;
_this.dataCount = dataCount;
return _this;};var _this = {};var getRsBlockTable = function(typeNumber, errorCorrectLevel) {switch(errorCorrectLevel) {case QRErrorCorrectLevel.L :return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];case QRErrorCorrectLevel.M :return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];case QRErrorCorrectLevel.Q :return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];case QRErrorCorrectLevel.H :return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];default :return undefined;
}};_this.getRSBlocks = function(typeNumber, errorCorrectLevel) {var rsBlock = getRsBlockTable(typeNumber, errorCorrectLevel);if (typeof rsBlock == 'undefined') {throw new Error('bad rs block @ typeNumber:' + typeNumber +'/errorCorrectLevel:' + errorCorrectLevel);
}var length = rsBlock.length / 3;var list = new Array();for (var i = 0; i < length; i += 1) {var count = rsBlock[i * 3 + 0];var totalCount = rsBlock[i * 3 + 1];var dataCount = rsBlock[i * 3 + 2];for (var j = 0; j < count; j += 1) {list.push(qrRSBlock(totalCount, dataCount) );}
}return list;};return _this;
}();//---------------------------------------------------------------------
// qrBitBuffer
//---------------------------------------------------------------------var qrBitBuffer = function() {var _buffer = new Array();var _length = 0;var _this = {};_this.getBuffer = function() {
return _buffer;};_this.getAt = function(index) {
var bufIndex = Math.floor(index / 8);
return ( (_buffer[bufIndex] >>> (7 - index % 8) ) & 1) == 1;};_this.put = function(num, length) {
for (var i = 0; i < length; i += 1) {_this.putBit( ( (num >>> (length - i - 1) ) & 1) == 1);
}};_this.getLengthInBits = function() {
return _length;};_this.putBit = function(bit) {var bufIndex = Math.floor(_length / 8);
if (_buffer.length <= bufIndex) {_buffer.push(0);
}if (bit) {_buffer[bufIndex] |= (0x80 >>> (_length % 8) );
}_length += 1;};return _this;
};//---------------------------------------------------------------------
// qr8BitByte
//---------------------------------------------------------------------var qr8BitByte = function(data) {var _mode = QRMode.MODE_8BIT_BYTE;var _data = data;var _parsedData = [];var _this = {};// Added to support UTF-8 Charactersfor (var i = 0, l = _data.length; i < l; i++) {
var byteArray = [];
var code = _data.charCodeAt(i);if (code > 0x10000) {byteArray[0] = 0xF0 | ((code & 0x1C0000) >>> 18);byteArray[1] = 0x80 | ((code & 0x3F000) >>> 12);byteArray[2] = 0x80 | ((code & 0xFC0) >>> 6);byteArray[3] = 0x80 | (code & 0x3F);
} else if (code > 0x800) {byteArray[0] = 0xE0 | ((code & 0xF000) >>> 12);byteArray[1] = 0x80 | ((code & 0xFC0) >>> 6);byteArray[2] = 0x80 | (code & 0x3F);
} else if (code > 0x80) {byteArray[0] = 0xC0 | ((code & 0x7C0) >>> 6);byteArray[1] = 0x80 | (code & 0x3F);
} else {byteArray[0] = code;
}// Fix Unicode corruption bug_parsedData.push(byteArray);}_parsedData = Array.prototype.concat.apply([], _parsedData);if (_parsedData.length != _data.length) {
_parsedData.unshift(191);
_parsedData.unshift(187);
_parsedData.unshift(239);}var _bytes = _parsedData;_this.getMode = function() {
return _mode;};_this.getLength = function(buffer) {
return _bytes.length;};_this.write = function(buffer) {
for (var i = 0; i < _bytes.length; i += 1) {buffer.put(_bytes[i], 8);
}};return _this;
};//=====================================================================
// GIF Support etc.
////---------------------------------------------------------------------
// byteArrayOutputStream
//---------------------------------------------------------------------var byteArrayOutputStream = function() {var _bytes = new Array();var _this = {};_this.writeByte = function(b) {
_bytes.push(b & 0xff);};_this.writeShort = function(i) {
_this.writeByte(i);
_this.writeByte(i >>> 8);};_this.writeBytes = function(b, off, len) {
off = off || 0;
len = len || b.length;
for (var i = 0; i < len; i += 1) {_this.writeByte(b[i + off]);
}};_this.writeString = function(s) {
for (var i = 0; i < s.length; i += 1) {_this.writeByte(s.charCodeAt(i) );
}};_this.toByteArray = function() {
return _bytes;};_this.toString = function() {
var s = '';
s += '[';
for (var i = 0; i < _bytes.length; i += 1) {if (i > 0) {s += ',';}s += _bytes[i];
}
s += ']';
return s;};return _this;
};//---------------------------------------------------------------------
// base64EncodeOutputStream
//---------------------------------------------------------------------var base64EncodeOutputStream = function() {var _buffer = 0;var _buflen = 0;var _length = 0;var _base64 = '';var _this = {};var writeEncoded = function(b) {
_base64 += String.fromCharCode(encode(b & 0x3f) );};var encode = function(n) {
if (n < 0) {// error.
} else if (n < 26) {return 0x41 + n;
} else if (n < 52) {return 0x61 + (n - 26);
} else if (n < 62) {return 0x30 + (n - 52);
} else if (n == 62) {return 0x2b;
} else if (n == 63) {return 0x2f;
}
throw new Error('n:' + n);};_this.writeByte = function(n) {_buffer = (_buffer << 8) | (n & 0xff);
_buflen += 8;
_length += 1;while (_buflen >= 6) {writeEncoded(_buffer >>> (_buflen - 6) );_buflen -= 6;
}};_this.flush = function() {if (_buflen > 0) {writeEncoded(_buffer << (6 - _buflen) );_buffer = 0;_buflen = 0;
}if (_length % 3 != 0) {// paddingvar padlen = 3 - _length % 3;for (var i = 0; i < padlen; i += 1) {_base64 += '=';}
}};_this.toString = function() {
return _base64;};return _this;
};//---------------------------------------------------------------------
// base64DecodeInputStream
//---------------------------------------------------------------------var base64DecodeInputStream = function(str) {var _str = str;var _pos = 0;var _buffer = 0;var _buflen = 0;var _this = {};_this.read = function() {while (_buflen < 8) {if (_pos >= _str.length) {if (_buflen == 0) {return -1;}throw new Error('unexpected end of file./' + _buflen);}var c = _str.charAt(_pos);_pos += 1;if (c == '=') {_buflen = 0;return -1;} else if (c.match(/^\s$/) ) {// ignore if whitespace.continue;}_buffer = (_buffer << 6) | decode(c.charCodeAt(0) );_buflen += 6;
}var n = (_buffer >>> (_buflen - 8) ) & 0xff;
_buflen -= 8;
return n;};var decode = function(c) {
if (0x41 <= c && c <= 0x5a) {return c - 0x41;
} else if (0x61 <= c && c <= 0x7a) {return c - 0x61 + 26;
} else if (0x30 <= c && c <= 0x39) {return c - 0x30 + 52;
} else if (c == 0x2b) {return 62;
} else if (c == 0x2f) {return 63;
} else {throw new Error('c:' + c);
}};return _this;
};//---------------------------------------------------------------------
// gifImage (B/W)
//---------------------------------------------------------------------var gifImage = function(width, height) {var _width = width;var _height = height;var _data = new Array(width * height);var _this = {};_this.setPixel = function(x, y, pixel) {
_data[y * _width + x] = pixel;};_this.write = function(out) {//---------------------------------
// GIF Signatureout.writeString('GIF87a');//---------------------------------
// Screen Descriptorout.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 Descriptorout.writeString(',');
out.writeShort(0);
out.writeShort(0);
out.writeShort(_width);
out.writeShort(_height);
out.writeByte(0);//---------------------------------
// Local Color Map//---------------------------------
// Raster Datavar lzwMinCodeSize = 2;
var raster = getLZWRaster(lzwMinCodeSize);out.writeByte(lzwMinCodeSize);var offset = 0;while (raster.length - offset > 255) {out.writeByte(255);out.writeBytes(raster, offset, 255);offset += 255;
}out.writeByte(raster.length - offset);
out.writeBytes(raster, offset, raster.length - offset);
out.writeByte(0x00);//---------------------------------
// GIF Terminator
out.writeString(';');};var bitOutputStream = function(out) {var _out = out;
var _bitLength = 0;
var _bitBuffer = 0;var _this = {};_this.write = function(data, length) {if ( (data >>> length) != 0) {throw new Error('length over');}while (_bitLength + length >= 8) {_out.writeByte(0xff & ( (data << _bitLength) | _bitBuffer) );length -= (8 - _bitLength);data >>>= (8 - _bitLength);_bitBuffer = 0;_bitLength = 0;}_bitBuffer = (data << _bitLength) | _bitBuffer;_bitLength = _bitLength + length;
};_this.flush = function() {if (_bitLength > 0) {_out.writeByte(_bitBuffer);}
};return _this;};var getLZWRaster = function(lzwMinCodeSize) {var clearCode = 1 << lzwMinCodeSize;
var endCode = (1 << lzwMinCodeSize) + 1;
var bitLength = lzwMinCodeSize + 1;// Setup LZWTable
var table = lzwTable();for (var i = 0; i < clearCode; i += 1) {table.add(String.fromCharCode(i) );
}
table.add(String.fromCharCode(clearCode) );
table.add(String.fromCharCode(endCode) );var byteOut = byteArrayOutputStream();
var bitOut = bitOutputStream(byteOut);// clear code
bitOut.write(clearCode, bitLength);var dataIndex = 0;var s = String.fromCharCode(_data[dataIndex]);
dataIndex += 1;while (dataIndex < _data.length) {var c = String.fromCharCode(_data[dataIndex]);dataIndex += 1;if (table.contains(s + c) ) {s = s + c;} else {bitOut.write(table.indexOf(s), bitLength);if (table.size() < 0xfff) {if (table.size() == (1 << bitLength) ) {bitLength += 1;}table.add(s + c);}s = c;}
}bitOut.write(table.indexOf(s), bitLength);// end code
bitOut.write(endCode, bitLength);bitOut.flush();return byteOut.toByteArray();};var lzwTable = function() {var _map = {};
var _size = 0;var _this = {};_this.add = function(key) {if (_this.contains(key) ) {throw new Error('dup key:' + key);}_map[key] = _size;_size += 1;
};_this.size = function() {return _size;
};_this.indexOf = function(key) {return _map[key];
};_this.contains = function(key) {return typeof _map[key] != 'undefined';
};return _this;};return _this;
};var createImgTag = function(width, height, getPixel, alt) {var gif = gifImage(width, height);for (var y = 0; y < height; y += 1) {
for (var x = 0; x < width; x += 1) {gif.setPixel(x, y, getPixel(x, y) );
}}var b = byteArrayOutputStream();gif.write(b);var base64 = base64EncodeOutputStream();var bytes = b.toByteArray();for (var i = 0; i < bytes.length; i += 1) {
base64.writeByte(bytes[i]);}base64.flush();var img = '';img += 'data:image/gif;base64,';img += base64;return img;
};//---------------------------------------------------------------------
// returns qrcode function.var drawImg = function(text, options) {options = options || {};var typeNumber = options.typeNumber || 4;var errorCorrectLevel = options.errorCorrectLevel || 'M';var size = options.size || 500;var qr;try {qr = qrcode(typeNumber, errorCorrectLevel || 'M');qr.addData(text);qr.make();} catch (e) {if(typeNumber >= 40) {throw new Error('Text too long to encode');} else {return drawImg(text, {size: size,errorCorrectLevel: errorCorrectLevel,typeNumber: typeNumber + 1});}}// calc cellsize and marginvar cellsize = parseInt(size / qr.getModuleCount());var margin = parseInt((size - qr.getModuleCount() * cellsize) / 2);return qr.createImgTag(cellsize, margin, size);
};
module.exports = {
drawImg: drawImg
};