qrcode.js 28 KB

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  1. //---------------------------------------------------------------------
  2. // QRCode for JavaScript
  3. //
  4. // Copyright (c) 2009 Kazuhiko Arase
  5. //
  6. // URL: http://www.d-project.com/
  7. //
  8. // Licensed under the MIT license:
  9. // http://www.opensource.org/licenses/mit-license.php
  10. //
  11. // The word "QR Code" is registered trademark of
  12. // DENSO WAVE INCORPORATED
  13. // http://www.denso-wave.com/qrcode/faqpatent-e.html
  14. //
  15. //---------------------------------------------------------------------
  16. //---------------------------------------------------------------------
  17. // QR8bitByte
  18. //---------------------------------------------------------------------
  19. function QR8bitByte(data) {
  20. this.mode = QRMode.MODE_8BIT_BYTE;
  21. this.data = data;
  22. }
  23. QR8bitByte.prototype = {
  24. getLength: function(buffer) {
  25. return this.data.length;
  26. },
  27. write: function(buffer) {
  28. for (var i = 0; i < this.data.length; i++) {
  29. // not JIS ...
  30. buffer.put(this.data.charCodeAt(i), 8);
  31. }
  32. }
  33. };
  34. //---------------------------------------------------------------------
  35. // QRCode
  36. //---------------------------------------------------------------------
  37. function QRCode(typeNumber, errorCorrectLevel) {
  38. this.typeNumber = typeNumber;
  39. this.errorCorrectLevel = errorCorrectLevel;
  40. this.modules = null;
  41. this.moduleCount = 0;
  42. this.dataCache = null;
  43. this.dataList = new Array();
  44. }
  45. QRCode.prototype = {
  46. addData: function(data) {
  47. var newData = new QR8bitByte(data);
  48. this.dataList.push(newData);
  49. this.dataCache = null;
  50. },
  51. isDark: function(row, col) {
  52. if (row < 0 || this.moduleCount <= row || col < 0 || this.moduleCount <= col) {
  53. throw new Error(row + "," + col);
  54. }
  55. return this.modules[row][col];
  56. },
  57. getModuleCount: function() {
  58. return this.moduleCount;
  59. },
  60. make: function() {
  61. // Calculate automatically typeNumber if provided is < 1
  62. if (this.typeNumber < 1) {
  63. var typeNumber = 1;
  64. for (typeNumber = 1; typeNumber < 40; typeNumber++) {
  65. var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, this.errorCorrectLevel);
  66. var buffer = new QRBitBuffer();
  67. var totalDataCount = 0;
  68. for (var i = 0; i < rsBlocks.length; i++) {
  69. totalDataCount += rsBlocks[i].dataCount;
  70. }
  71. for (var i = 0; i < this.dataList.length; i++) {
  72. var data = this.dataList[i];
  73. buffer.put(data.mode, 4);
  74. buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber));
  75. data.write(buffer);
  76. }
  77. if (buffer.getLengthInBits() <= totalDataCount * 8)
  78. break;
  79. }
  80. this.typeNumber = typeNumber;
  81. }
  82. this.makeImpl(false, this.getBestMaskPattern());
  83. },
  84. makeImpl: function(test, maskPattern) {
  85. this.moduleCount = this.typeNumber * 4 + 17;
  86. this.modules = new Array(this.moduleCount);
  87. for (var row = 0; row < this.moduleCount; row++) {
  88. this.modules[row] = new Array(this.moduleCount);
  89. for (var col = 0; col < this.moduleCount; col++) {
  90. this.modules[row][col] = null; //(col + row) % 3;
  91. }
  92. }
  93. this.setupPositionProbePattern(0, 0);
  94. this.setupPositionProbePattern(this.moduleCount - 7, 0);
  95. this.setupPositionProbePattern(0, this.moduleCount - 7);
  96. this.setupPositionAdjustPattern();
  97. this.setupTimingPattern();
  98. this.setupTypeInfo(test, maskPattern);
  99. if (this.typeNumber >= 7) {
  100. this.setupTypeNumber(test);
  101. }
  102. if (this.dataCache == null) {
  103. this.dataCache = QRCode.createData(this.typeNumber, this.errorCorrectLevel, this.dataList);
  104. }
  105. this.mapData(this.dataCache, maskPattern);
  106. },
  107. setupPositionProbePattern: function(row, col) {
  108. for (var r = -1; r <= 7; r++) {
  109. if (row + r <= -1 || this.moduleCount <= row + r) continue;
  110. for (var c = -1; c <= 7; c++) {
  111. if (col + c <= -1 || this.moduleCount <= col + c) continue;
  112. if ((0 <= r && r <= 6 && (c == 0 || c == 6)) ||
  113. (0 <= c && c <= 6 && (r == 0 || r == 6)) ||
  114. (2 <= r && r <= 4 && 2 <= c && c <= 4)) {
  115. this.modules[row + r][col + c] = true;
  116. } else {
  117. this.modules[row + r][col + c] = false;
  118. }
  119. }
  120. }
  121. },
  122. getBestMaskPattern: function() {
  123. var minLostPoint = 0;
  124. var pattern = 0;
  125. for (var i = 0; i < 8; i++) {
  126. this.makeImpl(true, i);
  127. var lostPoint = QRUtil.getLostPoint(this);
  128. if (i == 0 || minLostPoint > lostPoint) {
  129. minLostPoint = lostPoint;
  130. pattern = i;
  131. }
  132. }
  133. return pattern;
  134. },
  135. createMovieClip: function(target_mc, instance_name, depth) {
  136. var qr_mc = target_mc.createEmptyMovieClip(instance_name, depth);
  137. var cs = 1;
  138. this.make();
  139. for (var row = 0; row < this.modules.length; row++) {
  140. var y = row * cs;
  141. for (var col = 0; col < this.modules[row].length; col++) {
  142. var x = col * cs;
  143. var dark = this.modules[row][col];
  144. if (dark) {
  145. qr_mc.beginFill(0, 100);
  146. qr_mc.moveTo(x, y);
  147. qr_mc.lineTo(x + cs, y);
  148. qr_mc.lineTo(x + cs, y + cs);
  149. qr_mc.lineTo(x, y + cs);
  150. qr_mc.endFill();
  151. }
  152. }
  153. }
  154. return qr_mc;
  155. },
  156. setupTimingPattern: function() {
  157. for (var r = 8; r < this.moduleCount - 8; r++) {
  158. if (this.modules[r][6] != null) {
  159. continue;
  160. }
  161. this.modules[r][6] = (r % 2 == 0);
  162. }
  163. for (var c = 8; c < this.moduleCount - 8; c++) {
  164. if (this.modules[6][c] != null) {
  165. continue;
  166. }
  167. this.modules[6][c] = (c % 2 == 0);
  168. }
  169. },
  170. setupPositionAdjustPattern: function() {
  171. var pos = QRUtil.getPatternPosition(this.typeNumber);
  172. for (var i = 0; i < pos.length; i++) {
  173. for (var j = 0; j < pos.length; j++) {
  174. var row = pos[i];
  175. var col = pos[j];
  176. if (this.modules[row][col] != null) {
  177. continue;
  178. }
  179. for (var r = -2; r <= 2; r++) {
  180. for (var c = -2; c <= 2; c++) {
  181. if (r == -2 || r == 2 || c == -2 || c == 2 ||
  182. (r == 0 && c == 0)) {
  183. this.modules[row + r][col + c] = true;
  184. } else {
  185. this.modules[row + r][col + c] = false;
  186. }
  187. }
  188. }
  189. }
  190. }
  191. },
  192. setupTypeNumber: function(test) {
  193. var bits = QRUtil.getBCHTypeNumber(this.typeNumber);
  194. for (var i = 0; i < 18; i++) {
  195. var mod = (!test && ((bits >> i) & 1) == 1);
  196. this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod;
  197. }
  198. for (var i = 0; i < 18; i++) {
  199. var mod = (!test && ((bits >> i) & 1) == 1);
  200. this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
  201. }
  202. },
  203. setupTypeInfo: function(test, maskPattern) {
  204. var data = (this.errorCorrectLevel << 3) | maskPattern;
  205. var bits = QRUtil.getBCHTypeInfo(data);
  206. // vertical
  207. for (var i = 0; i < 15; i++) {
  208. var mod = (!test && ((bits >> i) & 1) == 1);
  209. if (i < 6) {
  210. this.modules[i][8] = mod;
  211. } else if (i < 8) {
  212. this.modules[i + 1][8] = mod;
  213. } else {
  214. this.modules[this.moduleCount - 15 + i][8] = mod;
  215. }
  216. }
  217. // horizontal
  218. for (var i = 0; i < 15; i++) {
  219. var mod = (!test && ((bits >> i) & 1) == 1);
  220. if (i < 8) {
  221. this.modules[8][this.moduleCount - i - 1] = mod;
  222. } else if (i < 9) {
  223. this.modules[8][15 - i - 1 + 1] = mod;
  224. } else {
  225. this.modules[8][15 - i - 1] = mod;
  226. }
  227. }
  228. // fixed module
  229. this.modules[this.moduleCount - 8][8] = (!test);
  230. },
  231. mapData: function(data, maskPattern) {
  232. var inc = -1;
  233. var row = this.moduleCount - 1;
  234. var bitIndex = 7;
  235. var byteIndex = 0;
  236. for (var col = this.moduleCount - 1; col > 0; col -= 2) {
  237. if (col == 6) col--;
  238. while (true) {
  239. for (var c = 0; c < 2; c++) {
  240. if (this.modules[row][col - c] == null) {
  241. var dark = false;
  242. if (byteIndex < data.length) {
  243. dark = (((data[byteIndex] >>> bitIndex) & 1) == 1);
  244. }
  245. var mask = QRUtil.getMask(maskPattern, row, col - c);
  246. if (mask) {
  247. dark = !dark;
  248. }
  249. this.modules[row][col - c] = dark;
  250. bitIndex--;
  251. if (bitIndex == -1) {
  252. byteIndex++;
  253. bitIndex = 7;
  254. }
  255. }
  256. }
  257. row += inc;
  258. if (row < 0 || this.moduleCount <= row) {
  259. row -= inc;
  260. inc = -inc;
  261. break;
  262. }
  263. }
  264. }
  265. }
  266. };
  267. QRCode.PAD0 = 0xEC;
  268. QRCode.PAD1 = 0x11;
  269. QRCode.createData = function(typeNumber, errorCorrectLevel, dataList) {
  270. var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectLevel);
  271. var buffer = new QRBitBuffer();
  272. for (var i = 0; i < dataList.length; i++) {
  273. var data = dataList[i];
  274. buffer.put(data.mode, 4);
  275. buffer.put(data.getLength(), QRUtil.getLengthInBits(data.mode, typeNumber));
  276. data.write(buffer);
  277. }
  278. // calc num max data.
  279. var totalDataCount = 0;
  280. for (var i = 0; i < rsBlocks.length; i++) {
  281. totalDataCount += rsBlocks[i].dataCount;
  282. }
  283. if (buffer.getLengthInBits() > totalDataCount * 8) {
  284. throw new Error("code length overflow. (" +
  285. buffer.getLengthInBits() +
  286. ">" +
  287. totalDataCount * 8 +
  288. ")");
  289. }
  290. // end code
  291. if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
  292. buffer.put(0, 4);
  293. }
  294. // padding
  295. while (buffer.getLengthInBits() % 8 != 0) {
  296. buffer.putBit(false);
  297. }
  298. // padding
  299. while (true) {
  300. if (buffer.getLengthInBits() >= totalDataCount * 8) {
  301. break;
  302. }
  303. buffer.put(QRCode.PAD0, 8);
  304. if (buffer.getLengthInBits() >= totalDataCount * 8) {
  305. break;
  306. }
  307. buffer.put(QRCode.PAD1, 8);
  308. }
  309. return QRCode.createBytes(buffer, rsBlocks);
  310. }
  311. QRCode.createBytes = function(buffer, rsBlocks) {
  312. var offset = 0;
  313. var maxDcCount = 0;
  314. var maxEcCount = 0;
  315. var dcdata = new Array(rsBlocks.length);
  316. var ecdata = new Array(rsBlocks.length);
  317. for (var r = 0; r < rsBlocks.length; r++) {
  318. var dcCount = rsBlocks[r].dataCount;
  319. var ecCount = rsBlocks[r].totalCount - dcCount;
  320. maxDcCount = Math.max(maxDcCount, dcCount);
  321. maxEcCount = Math.max(maxEcCount, ecCount);
  322. dcdata[r] = new Array(dcCount);
  323. for (var i = 0; i < dcdata[r].length; i++) {
  324. dcdata[r][i] = 0xff & buffer.buffer[i + offset];
  325. }
  326. offset += dcCount;
  327. var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
  328. var rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1);
  329. var modPoly = rawPoly.mod(rsPoly);
  330. ecdata[r] = new Array(rsPoly.getLength() - 1);
  331. for (var i = 0; i < ecdata[r].length; i++) {
  332. var modIndex = i + modPoly.getLength() - ecdata[r].length;
  333. ecdata[r][i] = (modIndex >= 0) ? modPoly.get(modIndex) : 0;
  334. }
  335. }
  336. var totalCodeCount = 0;
  337. for (var i = 0; i < rsBlocks.length; i++) {
  338. totalCodeCount += rsBlocks[i].totalCount;
  339. }
  340. var data = new Array(totalCodeCount);
  341. var index = 0;
  342. for (var i = 0; i < maxDcCount; i++) {
  343. for (var r = 0; r < rsBlocks.length; r++) {
  344. if (i < dcdata[r].length) {
  345. data[index++] = dcdata[r][i];
  346. }
  347. }
  348. }
  349. for (var i = 0; i < maxEcCount; i++) {
  350. for (var r = 0; r < rsBlocks.length; r++) {
  351. if (i < ecdata[r].length) {
  352. data[index++] = ecdata[r][i];
  353. }
  354. }
  355. }
  356. return data;
  357. }
  358. //---------------------------------------------------------------------
  359. // QRMode
  360. //---------------------------------------------------------------------
  361. var QRMode = {
  362. MODE_NUMBER: 1 << 0,
  363. MODE_ALPHA_NUM: 1 << 1,
  364. MODE_8BIT_BYTE: 1 << 2,
  365. MODE_KANJI: 1 << 3
  366. };
  367. //---------------------------------------------------------------------
  368. // QRErrorCorrectLevel
  369. //---------------------------------------------------------------------
  370. var QRErrorCorrectLevel = {
  371. L: 1,
  372. M: 0,
  373. Q: 3,
  374. H: 2
  375. };
  376. //---------------------------------------------------------------------
  377. // QRMaskPattern
  378. //---------------------------------------------------------------------
  379. var QRMaskPattern = {
  380. PATTERN000: 0,
  381. PATTERN001: 1,
  382. PATTERN010: 2,
  383. PATTERN011: 3,
  384. PATTERN100: 4,
  385. PATTERN101: 5,
  386. PATTERN110: 6,
  387. PATTERN111: 7
  388. };
  389. //---------------------------------------------------------------------
  390. // QRUtil
  391. //---------------------------------------------------------------------
  392. var QRUtil = {
  393. PATTERN_POSITION_TABLE: [
  394. [],
  395. [6, 18],
  396. [6, 22],
  397. [6, 26],
  398. [6, 30],
  399. [6, 34],
  400. [6, 22, 38],
  401. [6, 24, 42],
  402. [6, 26, 46],
  403. [6, 28, 50],
  404. [6, 30, 54],
  405. [6, 32, 58],
  406. [6, 34, 62],
  407. [6, 26, 46, 66],
  408. [6, 26, 48, 70],
  409. [6, 26, 50, 74],
  410. [6, 30, 54, 78],
  411. [6, 30, 56, 82],
  412. [6, 30, 58, 86],
  413. [6, 34, 62, 90],
  414. [6, 28, 50, 72, 94],
  415. [6, 26, 50, 74, 98],
  416. [6, 30, 54, 78, 102],
  417. [6, 28, 54, 80, 106],
  418. [6, 32, 58, 84, 110],
  419. [6, 30, 58, 86, 114],
  420. [6, 34, 62, 90, 118],
  421. [6, 26, 50, 74, 98, 122],
  422. [6, 30, 54, 78, 102, 126],
  423. [6, 26, 52, 78, 104, 130],
  424. [6, 30, 56, 82, 108, 134],
  425. [6, 34, 60, 86, 112, 138],
  426. [6, 30, 58, 86, 114, 142],
  427. [6, 34, 62, 90, 118, 146],
  428. [6, 30, 54, 78, 102, 126, 150],
  429. [6, 24, 50, 76, 102, 128, 154],
  430. [6, 28, 54, 80, 106, 132, 158],
  431. [6, 32, 58, 84, 110, 136, 162],
  432. [6, 26, 54, 82, 110, 138, 166],
  433. [6, 30, 58, 86, 114, 142, 170]
  434. ],
  435. G15: (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0),
  436. G18: (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0),
  437. G15_MASK: (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1),
  438. getBCHTypeInfo: function(data) {
  439. var d = data << 10;
  440. while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {
  441. d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15)));
  442. }
  443. return ((data << 10) | d) ^ QRUtil.G15_MASK;
  444. },
  445. getBCHTypeNumber: function(data) {
  446. var d = data << 12;
  447. while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {
  448. d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18)));
  449. }
  450. return (data << 12) | d;
  451. },
  452. getBCHDigit: function(data) {
  453. var digit = 0;
  454. while (data != 0) {
  455. digit++;
  456. data >>>= 1;
  457. }
  458. return digit;
  459. },
  460. getPatternPosition: function(typeNumber) {
  461. return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];
  462. },
  463. getMask: function(maskPattern, i, j) {
  464. switch (maskPattern) {
  465. case QRMaskPattern.PATTERN000:
  466. return (i + j) % 2 == 0;
  467. case QRMaskPattern.PATTERN001:
  468. return i % 2 == 0;
  469. case QRMaskPattern.PATTERN010:
  470. return j % 3 == 0;
  471. case QRMaskPattern.PATTERN011:
  472. return (i + j) % 3 == 0;
  473. case QRMaskPattern.PATTERN100:
  474. return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;
  475. case QRMaskPattern.PATTERN101:
  476. return (i * j) % 2 + (i * j) % 3 == 0;
  477. case QRMaskPattern.PATTERN110:
  478. return ((i * j) % 2 + (i * j) % 3) % 2 == 0;
  479. case QRMaskPattern.PATTERN111:
  480. return ((i * j) % 3 + (i + j) % 2) % 2 == 0;
  481. default:
  482. throw new Error("bad maskPattern:" + maskPattern);
  483. }
  484. },
  485. getErrorCorrectPolynomial: function(errorCorrectLength) {
  486. var a = new QRPolynomial([1], 0);
  487. for (var i = 0; i < errorCorrectLength; i++) {
  488. a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0));
  489. }
  490. return a;
  491. },
  492. getLengthInBits: function(mode, type) {
  493. if (1 <= type && type < 10) {
  494. // 1 - 9
  495. switch (mode) {
  496. case QRMode.MODE_NUMBER:
  497. return 10;
  498. case QRMode.MODE_ALPHA_NUM:
  499. return 9;
  500. case QRMode.MODE_8BIT_BYTE:
  501. return 8;
  502. case QRMode.MODE_KANJI:
  503. return 8;
  504. default:
  505. throw new Error("mode:" + mode);
  506. }
  507. } else if (type < 27) {
  508. // 10 - 26
  509. switch (mode) {
  510. case QRMode.MODE_NUMBER:
  511. return 12;
  512. case QRMode.MODE_ALPHA_NUM:
  513. return 11;
  514. case QRMode.MODE_8BIT_BYTE:
  515. return 16;
  516. case QRMode.MODE_KANJI:
  517. return 10;
  518. default:
  519. throw new Error("mode:" + mode);
  520. }
  521. } else if (type < 41) {
  522. // 27 - 40
  523. switch (mode) {
  524. case QRMode.MODE_NUMBER:
  525. return 14;
  526. case QRMode.MODE_ALPHA_NUM:
  527. return 13;
  528. case QRMode.MODE_8BIT_BYTE:
  529. return 16;
  530. case QRMode.MODE_KANJI:
  531. return 12;
  532. default:
  533. throw new Error("mode:" + mode);
  534. }
  535. } else {
  536. throw new Error("type:" + type);
  537. }
  538. },
  539. getLostPoint: function(qrCode) {
  540. var moduleCount = qrCode.getModuleCount();
  541. var lostPoint = 0;
  542. // LEVEL1
  543. for (var row = 0; row < moduleCount; row++) {
  544. for (var col = 0; col < moduleCount; col++) {
  545. var sameCount = 0;
  546. var dark = qrCode.isDark(row, col);
  547. for (var r = -1; r <= 1; r++) {
  548. if (row + r < 0 || moduleCount <= row + r) {
  549. continue;
  550. }
  551. for (var c = -1; c <= 1; c++) {
  552. if (col + c < 0 || moduleCount <= col + c) {
  553. continue;
  554. }
  555. if (r == 0 && c == 0) {
  556. continue;
  557. }
  558. if (dark == qrCode.isDark(row + r, col + c)) {
  559. sameCount++;
  560. }
  561. }
  562. }
  563. if (sameCount > 5) {
  564. lostPoint += (3 + sameCount - 5);
  565. }
  566. }
  567. }
  568. // LEVEL2
  569. for (var row = 0; row < moduleCount - 1; row++) {
  570. for (var col = 0; col < moduleCount - 1; col++) {
  571. var count = 0;
  572. if (qrCode.isDark(row, col)) count++;
  573. if (qrCode.isDark(row + 1, col)) count++;
  574. if (qrCode.isDark(row, col + 1)) count++;
  575. if (qrCode.isDark(row + 1, col + 1)) count++;
  576. if (count == 0 || count == 4) {
  577. lostPoint += 3;
  578. }
  579. }
  580. }
  581. // LEVEL3
  582. for (var row = 0; row < moduleCount; row++) {
  583. for (var col = 0; col < moduleCount - 6; col++) {
  584. if (qrCode.isDark(row, col) &&
  585. !qrCode.isDark(row, col + 1) &&
  586. qrCode.isDark(row, col + 2) &&
  587. qrCode.isDark(row, col + 3) &&
  588. qrCode.isDark(row, col + 4) &&
  589. !qrCode.isDark(row, col + 5) &&
  590. qrCode.isDark(row, col + 6)) {
  591. lostPoint += 40;
  592. }
  593. }
  594. }
  595. for (var col = 0; col < moduleCount; col++) {
  596. for (var row = 0; row < moduleCount - 6; row++) {
  597. if (qrCode.isDark(row, col) &&
  598. !qrCode.isDark(row + 1, col) &&
  599. qrCode.isDark(row + 2, col) &&
  600. qrCode.isDark(row + 3, col) &&
  601. qrCode.isDark(row + 4, col) &&
  602. !qrCode.isDark(row + 5, col) &&
  603. qrCode.isDark(row + 6, col)) {
  604. lostPoint += 40;
  605. }
  606. }
  607. }
  608. // LEVEL4
  609. var darkCount = 0;
  610. for (var col = 0; col < moduleCount; col++) {
  611. for (var row = 0; row < moduleCount; row++) {
  612. if (qrCode.isDark(row, col)) {
  613. darkCount++;
  614. }
  615. }
  616. }
  617. var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
  618. lostPoint += ratio * 10;
  619. return lostPoint;
  620. }
  621. };
  622. //---------------------------------------------------------------------
  623. // QRMath
  624. //---------------------------------------------------------------------
  625. var QRMath = {
  626. glog: function(n) {
  627. if (n < 1) {
  628. throw new Error("glog(" + n + ")");
  629. }
  630. return QRMath.LOG_TABLE[n];
  631. },
  632. gexp: function(n) {
  633. while (n < 0) {
  634. n += 255;
  635. }
  636. while (n >= 256) {
  637. n -= 255;
  638. }
  639. return QRMath.EXP_TABLE[n];
  640. },
  641. EXP_TABLE: new Array(256),
  642. LOG_TABLE: new Array(256)
  643. };
  644. for (var i = 0; i < 8; i++) {
  645. QRMath.EXP_TABLE[i] = 1 << i;
  646. }
  647. for (var i = 8; i < 256; i++) {
  648. QRMath.EXP_TABLE[i] = QRMath.EXP_TABLE[i - 4] ^
  649. QRMath.EXP_TABLE[i - 5] ^
  650. QRMath.EXP_TABLE[i - 6] ^
  651. QRMath.EXP_TABLE[i - 8];
  652. }
  653. for (var i = 0; i < 255; i++) {
  654. QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i;
  655. }
  656. //---------------------------------------------------------------------
  657. // QRPolynomial
  658. //---------------------------------------------------------------------
  659. function QRPolynomial(num, shift) {
  660. if (num.length == undefined) {
  661. throw new Error(num.length + "/" + shift);
  662. }
  663. var offset = 0;
  664. while (offset < num.length && num[offset] == 0) {
  665. offset++;
  666. }
  667. this.num = new Array(num.length - offset + shift);
  668. for (var i = 0; i < num.length - offset; i++) {
  669. this.num[i] = num[i + offset];
  670. }
  671. }
  672. QRPolynomial.prototype = {
  673. get: function(index) {
  674. return this.num[index];
  675. },
  676. getLength: function() {
  677. return this.num.length;
  678. },
  679. multiply: function(e) {
  680. var num = new Array(this.getLength() + e.getLength() - 1);
  681. for (var i = 0; i < this.getLength(); i++) {
  682. for (var j = 0; j < e.getLength(); j++) {
  683. num[i + j] ^= QRMath.gexp(QRMath.glog(this.get(i)) + QRMath.glog(e.get(j)));
  684. }
  685. }
  686. return new QRPolynomial(num, 0);
  687. },
  688. mod: function(e) {
  689. if (this.getLength() - e.getLength() < 0) {
  690. return this;
  691. }
  692. var ratio = QRMath.glog(this.get(0)) - QRMath.glog(e.get(0));
  693. var num = new Array(this.getLength());
  694. for (var i = 0; i < this.getLength(); i++) {
  695. num[i] = this.get(i);
  696. }
  697. for (var i = 0; i < e.getLength(); i++) {
  698. num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio);
  699. }
  700. // recursive call
  701. return new QRPolynomial(num, 0).mod(e);
  702. }
  703. };
  704. //---------------------------------------------------------------------
  705. // QRRSBlock
  706. //---------------------------------------------------------------------
  707. function QRRSBlock(totalCount, dataCount) {
  708. this.totalCount = totalCount;
  709. this.dataCount = dataCount;
  710. }
  711. QRRSBlock.RS_BLOCK_TABLE = [
  712. // L
  713. // M
  714. // Q
  715. // H
  716. // 1
  717. [1, 26, 19],
  718. [1, 26, 16],
  719. [1, 26, 13],
  720. [1, 26, 9],
  721. // 2
  722. [1, 44, 34],
  723. [1, 44, 28],
  724. [1, 44, 22],
  725. [1, 44, 16],
  726. // 3
  727. [1, 70, 55],
  728. [1, 70, 44],
  729. [2, 35, 17],
  730. [2, 35, 13],
  731. // 4
  732. [1, 100, 80],
  733. [2, 50, 32],
  734. [2, 50, 24],
  735. [4, 25, 9],
  736. // 5
  737. [1, 134, 108],
  738. [2, 67, 43],
  739. [2, 33, 15, 2, 34, 16],
  740. [2, 33, 11, 2, 34, 12],
  741. // 6
  742. [2, 86, 68],
  743. [4, 43, 27],
  744. [4, 43, 19],
  745. [4, 43, 15],
  746. // 7
  747. [2, 98, 78],
  748. [4, 49, 31],
  749. [2, 32, 14, 4, 33, 15],
  750. [4, 39, 13, 1, 40, 14],
  751. // 8
  752. [2, 121, 97],
  753. [2, 60, 38, 2, 61, 39],
  754. [4, 40, 18, 2, 41, 19],
  755. [4, 40, 14, 2, 41, 15],
  756. // 9
  757. [2, 146, 116],
  758. [3, 58, 36, 2, 59, 37],
  759. [4, 36, 16, 4, 37, 17],
  760. [4, 36, 12, 4, 37, 13],
  761. // 10
  762. [2, 86, 68, 2, 87, 69],
  763. [4, 69, 43, 1, 70, 44],
  764. [6, 43, 19, 2, 44, 20],
  765. [6, 43, 15, 2, 44, 16],
  766. // 11
  767. [4, 101, 81],
  768. [1, 80, 50, 4, 81, 51],
  769. [4, 50, 22, 4, 51, 23],
  770. [3, 36, 12, 8, 37, 13],
  771. // 12
  772. [2, 116, 92, 2, 117, 93],
  773. [6, 58, 36, 2, 59, 37],
  774. [4, 46, 20, 6, 47, 21],
  775. [7, 42, 14, 4, 43, 15],
  776. // 13
  777. [4, 133, 107],
  778. [8, 59, 37, 1, 60, 38],
  779. [8, 44, 20, 4, 45, 21],
  780. [12, 33, 11, 4, 34, 12],
  781. // 14
  782. [3, 145, 115, 1, 146, 116],
  783. [4, 64, 40, 5, 65, 41],
  784. [11, 36, 16, 5, 37, 17],
  785. [11, 36, 12, 5, 37, 13],
  786. // 15
  787. [5, 109, 87, 1, 110, 88],
  788. [5, 65, 41, 5, 66, 42],
  789. [5, 54, 24, 7, 55, 25],
  790. [11, 36, 12],
  791. // 16
  792. [5, 122, 98, 1, 123, 99],
  793. [7, 73, 45, 3, 74, 46],
  794. [15, 43, 19, 2, 44, 20],
  795. [3, 45, 15, 13, 46, 16],
  796. // 17
  797. [1, 135, 107, 5, 136, 108],
  798. [10, 74, 46, 1, 75, 47],
  799. [1, 50, 22, 15, 51, 23],
  800. [2, 42, 14, 17, 43, 15],
  801. // 18
  802. [5, 150, 120, 1, 151, 121],
  803. [9, 69, 43, 4, 70, 44],
  804. [17, 50, 22, 1, 51, 23],
  805. [2, 42, 14, 19, 43, 15],
  806. // 19
  807. [3, 141, 113, 4, 142, 114],
  808. [3, 70, 44, 11, 71, 45],
  809. [17, 47, 21, 4, 48, 22],
  810. [9, 39, 13, 16, 40, 14],
  811. // 20
  812. [3, 135, 107, 5, 136, 108],
  813. [3, 67, 41, 13, 68, 42],
  814. [15, 54, 24, 5, 55, 25],
  815. [15, 43, 15, 10, 44, 16],
  816. // 21
  817. [4, 144, 116, 4, 145, 117],
  818. [17, 68, 42],
  819. [17, 50, 22, 6, 51, 23],
  820. [19, 46, 16, 6, 47, 17],
  821. // 22
  822. [2, 139, 111, 7, 140, 112],
  823. [17, 74, 46],
  824. [7, 54, 24, 16, 55, 25],
  825. [34, 37, 13],
  826. // 23
  827. [4, 151, 121, 5, 152, 122],
  828. [4, 75, 47, 14, 76, 48],
  829. [11, 54, 24, 14, 55, 25],
  830. [16, 45, 15, 14, 46, 16],
  831. // 24
  832. [6, 147, 117, 4, 148, 118],
  833. [6, 73, 45, 14, 74, 46],
  834. [11, 54, 24, 16, 55, 25],
  835. [30, 46, 16, 2, 47, 17],
  836. // 25
  837. [8, 132, 106, 4, 133, 107],
  838. [8, 75, 47, 13, 76, 48],
  839. [7, 54, 24, 22, 55, 25],
  840. [22, 45, 15, 13, 46, 16],
  841. // 26
  842. [10, 142, 114, 2, 143, 115],
  843. [19, 74, 46, 4, 75, 47],
  844. [28, 50, 22, 6, 51, 23],
  845. [33, 46, 16, 4, 47, 17],
  846. // 27
  847. [8, 152, 122, 4, 153, 123],
  848. [22, 73, 45, 3, 74, 46],
  849. [8, 53, 23, 26, 54, 24],
  850. [12, 45, 15, 28, 46, 16],
  851. // 28
  852. [3, 147, 117, 10, 148, 118],
  853. [3, 73, 45, 23, 74, 46],
  854. [4, 54, 24, 31, 55, 25],
  855. [11, 45, 15, 31, 46, 16],
  856. // 29
  857. [7, 146, 116, 7, 147, 117],
  858. [21, 73, 45, 7, 74, 46],
  859. [1, 53, 23, 37, 54, 24],
  860. [19, 45, 15, 26, 46, 16],
  861. // 30
  862. [5, 145, 115, 10, 146, 116],
  863. [19, 75, 47, 10, 76, 48],
  864. [15, 54, 24, 25, 55, 25],
  865. [23, 45, 15, 25, 46, 16],
  866. // 31
  867. [13, 145, 115, 3, 146, 116],
  868. [2, 74, 46, 29, 75, 47],
  869. [42, 54, 24, 1, 55, 25],
  870. [23, 45, 15, 28, 46, 16],
  871. // 32
  872. [17, 145, 115],
  873. [10, 74, 46, 23, 75, 47],
  874. [10, 54, 24, 35, 55, 25],
  875. [19, 45, 15, 35, 46, 16],
  876. // 33
  877. [17, 145, 115, 1, 146, 116],
  878. [14, 74, 46, 21, 75, 47],
  879. [29, 54, 24, 19, 55, 25],
  880. [11, 45, 15, 46, 46, 16],
  881. // 34
  882. [13, 145, 115, 6, 146, 116],
  883. [14, 74, 46, 23, 75, 47],
  884. [44, 54, 24, 7, 55, 25],
  885. [59, 46, 16, 1, 47, 17],
  886. // 35
  887. [12, 151, 121, 7, 152, 122],
  888. [12, 75, 47, 26, 76, 48],
  889. [39, 54, 24, 14, 55, 25],
  890. [22, 45, 15, 41, 46, 16],
  891. // 36
  892. [6, 151, 121, 14, 152, 122],
  893. [6, 75, 47, 34, 76, 48],
  894. [46, 54, 24, 10, 55, 25],
  895. [2, 45, 15, 64, 46, 16],
  896. // 37
  897. [17, 152, 122, 4, 153, 123],
  898. [29, 74, 46, 14, 75, 47],
  899. [49, 54, 24, 10, 55, 25],
  900. [24, 45, 15, 46, 46, 16],
  901. // 38
  902. [4, 152, 122, 18, 153, 123],
  903. [13, 74, 46, 32, 75, 47],
  904. [48, 54, 24, 14, 55, 25],
  905. [42, 45, 15, 32, 46, 16],
  906. // 39
  907. [20, 147, 117, 4, 148, 118],
  908. [40, 75, 47, 7, 76, 48],
  909. [43, 54, 24, 22, 55, 25],
  910. [10, 45, 15, 67, 46, 16],
  911. // 40
  912. [19, 148, 118, 6, 149, 119],
  913. [18, 75, 47, 31, 76, 48],
  914. [34, 54, 24, 34, 55, 25],
  915. [20, 45, 15, 61, 46, 16]
  916. ];
  917. QRRSBlock.getRSBlocks = function(typeNumber, errorCorrectLevel) {
  918. var rsBlock = QRRSBlock.getRsBlockTable(typeNumber, errorCorrectLevel);
  919. if (rsBlock == undefined) {
  920. throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" +
  921. errorCorrectLevel);
  922. }
  923. var length = rsBlock.length / 3;
  924. var list = new Array();
  925. for (var i = 0; i < length; i++) {
  926. var count = rsBlock[i * 3 + 0];
  927. var totalCount = rsBlock[i * 3 + 1];
  928. var dataCount = rsBlock[i * 3 + 2];
  929. for (var j = 0; j < count; j++) {
  930. list.push(new QRRSBlock(totalCount, dataCount));
  931. }
  932. }
  933. return list;
  934. }
  935. QRRSBlock.getRsBlockTable = function(typeNumber, errorCorrectLevel) {
  936. switch (errorCorrectLevel) {
  937. case QRErrorCorrectLevel.L:
  938. return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
  939. case QRErrorCorrectLevel.M:
  940. return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
  941. case QRErrorCorrectLevel.Q:
  942. return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
  943. case QRErrorCorrectLevel.H:
  944. return QRRSBlock.RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
  945. default:
  946. return undefined;
  947. }
  948. }
  949. //---------------------------------------------------------------------
  950. // QRBitBuffer
  951. //---------------------------------------------------------------------
  952. function QRBitBuffer() {
  953. this.buffer = new Array();
  954. this.length = 0;
  955. }
  956. QRBitBuffer.prototype = {
  957. get: function(index) {
  958. var bufIndex = Math.floor(index / 8);
  959. return ((this.buffer[bufIndex] >>> (7 - index % 8)) & 1) == 1;
  960. },
  961. put: function(num, length) {
  962. for (var i = 0; i < length; i++) {
  963. this.putBit(((num >>> (length - i - 1)) & 1) == 1);
  964. }
  965. },
  966. getLengthInBits: function() {
  967. return this.length;
  968. },
  969. putBit: function(bit) {
  970. var bufIndex = Math.floor(this.length / 8);
  971. if (this.buffer.length <= bufIndex) {
  972. this.buffer.push(0);
  973. }
  974. if (bit) {
  975. this.buffer[bufIndex] |= (0x80 >>> (this.length % 8));
  976. }
  977. this.length++;
  978. }
  979. };
  980. QRCode.errorCorrectLevel = QRErrorCorrectLevel;
  981. export default QRCode;