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| "use strict";
|
| var encode = require('./encode');
| var calculateEC = require('./errorcode');
| var matrix = require('./matrix');
|
| function _deepCopy(obj) {
| return JSON.parse(JSON.stringify(obj));
| }
|
| var EC_LEVELS = ['L', 'M', 'Q', 'H'];
|
| // {{{1 Versions
| var versions = [
| [], // there is no version 0
| // total number of codewords, (number of ec codewords, number of blocks) * ( L, M, Q, H )
| [26, 7, 1, 10, 1, 13, 1, 17, 1],
| [44, 10, 1, 16, 1, 22, 1, 28, 1],
| [70, 15, 1, 26, 1, 36, 2, 44, 2],
| [100, 20, 1, 36, 2, 52, 2, 64, 4],
| [134, 26, 1, 48, 2, 72, 4, 88, 4], // 5
| [172, 36, 2, 64, 4, 96, 4, 112, 4],
| [196, 40, 2, 72, 4, 108, 6, 130, 5],
| [242, 48, 2, 88, 4, 132, 6, 156, 6],
| [292, 60, 2, 110, 5, 160, 8, 192, 8],
| [346, 72, 4, 130, 5, 192, 8, 224, 8], // 10
| [404, 80, 4, 150, 5, 224, 8, 264, 11],
| [466, 96, 4, 176, 8, 260, 10, 308, 11],
| [532, 104, 4, 198, 9, 288, 12, 352, 16],
| [581, 120, 4, 216, 9, 320, 16, 384, 16],
| [655, 132, 6, 240, 10, 360, 12, 432, 18], // 15
| [733, 144, 6, 280, 10, 408, 17, 480, 16],
| [815, 168, 6, 308, 11, 448, 16, 532, 19],
| [901, 180, 6, 338, 13, 504, 18, 588, 21],
| [991, 196, 7, 364, 14, 546, 21, 650, 25],
| [1085, 224, 8, 416, 16, 600, 20, 700, 25], // 20
| [1156, 224, 8, 442, 17, 644, 23, 750, 25],
| [1258, 252, 9, 476, 17, 690, 23, 816, 34],
| [1364, 270, 9, 504, 18, 750, 25, 900, 30],
| [1474, 300, 10, 560, 20, 810, 27, 960, 32],
| [1588, 312, 12, 588, 21, 870, 29, 1050, 35], // 25
| [1706, 336, 12, 644, 23, 952, 34, 1110, 37],
| [1828, 360, 12, 700, 25, 1020, 34, 1200, 40],
| [1921, 390, 13, 728, 26, 1050, 35, 1260, 42],
| [2051, 420, 14, 784, 28, 1140, 38, 1350, 45],
| [2185, 450, 15, 812, 29, 1200, 40, 1440, 48], // 30
| [2323, 480, 16, 868, 31, 1290, 43, 1530, 51],
| [2465, 510, 17, 924, 33, 1350, 45, 1620, 54],
| [2611, 540, 18, 980, 35, 1440, 48, 1710, 57],
| [2761, 570, 19, 1036, 37, 1530, 51, 1800, 60],
| [2876, 570, 19, 1064, 38, 1590, 53, 1890, 63], // 35
| [3034, 600, 20, 1120, 40, 1680, 56, 1980, 66],
| [3196, 630, 21, 1204, 43, 1770, 59, 2100, 70],
| [3362, 660, 22, 1260, 45, 1860, 62, 2220, 74],
| [3532, 720, 24, 1316, 47, 1950, 65, 2310, 77],
| [3706, 750, 25, 1372, 49, 2040, 68, 2430, 81] // 40
| ];
|
| versions = versions.map(function(v, index) {
| if (!index) return {};
|
| var res = {
| }
| for (var i = 1; i < 8; i += 2) {
| var length = v[0] - v[i];
| var num_template = v[i+1];
| var ec_level = EC_LEVELS[(i/2)|0];
| var level = {
| version: index,
| ec_level: ec_level,
| data_len: length,
| ec_len: v[i] / num_template,
| blocks: [],
| ec: []
| }
|
| for (var k = num_template, n = length; k > 0; k--) {
| var block = (n / k)|0;
| level.blocks.push(block);
| n -= block;
|
| }
| res[ec_level] = level;
| }
| return res;
| });
|
| // {{{1 Get version template
| function getTemplate(message, ec_level) {
| var i = 1;
| var len;
|
| if (message.data1) {
| len = Math.ceil(message.data1.length / 8);
| } else {
| i = 10;
| }
| for (/* i */; i < 10; i++) {
| var version = versions[i][ec_level];
| if (version.data_len >= len) {
| return _deepCopy(version);
| }
| }
|
| if (message.data10) {
| len = Math.ceil(message.data10.length / 8);
| } else {
| i = 27;
| }
| for (/* i */; i < 27; i++) {
| var version = versions[i][ec_level];
| if (version.data_len >= len) {
| return _deepCopy(version);
| }
| }
|
| len = Math.ceil(message.data27.length / 8);
| for (/* i */; i < 41; i++) {
| var version = versions[i][ec_level];
| if (version.data_len >= len) {
| return _deepCopy(version);
| }
| }
| throw new Error("Too much data");
| }
|
| // {{{1 Fill template
| function fillTemplate(message, template) {
| var blocks = new Buffer(template.data_len);
| blocks.fill(0);
|
| if (template.version < 10) {
| message = message.data1;
| } else if (template.version < 27) {
| message = message.data10;
| } else {
| message = message.data27;
| }
|
| var len = message.length;
|
| for (var i = 0; i < len; i += 8) {
| var b = 0;
| for (var j = 0; j < 8; j++) {
| b = (b << 1) | (message[i + j] ? 1 : 0);
| }
| blocks[i / 8] = b;
| }
|
| var pad = 236;
| for (var i = Math.ceil((len + 4) / 8); i < blocks.length; i++) {
| blocks[i] = pad;
| pad = (pad == 236) ? 17 : 236;
| }
|
| var offset = 0;
| template.blocks = template.blocks.map(function(n) {
| var b = blocks.slice(offset, offset + n);
| offset += n;
| template.ec.push(calculateEC(b, template.ec_len));
| return b;
| });
|
| return template;
| }
|
| // {{{1 All-in-one
| function QR(text, ec_level, parse_url) {
| ec_level = EC_LEVELS.indexOf(ec_level) > -1 ? ec_level : 'M';
| var message = encode(text, parse_url);
| var data = fillTemplate(message, getTemplate(message, ec_level));
| return matrix.getMatrix(data);
| }
|
| // {{{1 export functions
| module.exports = {
| QR: QR,
| getTemplate: getTemplate,
| fillTemplate: fillTemplate,
| }
|
|
