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Merge branch 'MDL-19391-master-1' of git://git.luns.net.uk/moodle
[moodle.git] / lib / tcpdf / qrcode.php
blob1fab6b58a77d19b9b6d13fb9ec210d461897c89c
1 <?php
2 //============================================================+
3 // File name : qrcode.php
4 // Version : 1.0.009
5 // Begin : 2010-03-22
6 // Last Update : 2010-12-16
7 // Author : Nicola Asuni - Tecnick.com LTD - Manor Coach House, Church Hill, Aldershot, Hants, GU12 4RQ, UK - www.tecnick.com - info@tecnick.com
8 // License : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html)
9 // -------------------------------------------------------------------
10 // Copyright (C) 2010-2012 Nicola Asuni - Tecnick.com LTD
11 //
12 // This file is part of TCPDF software library.
13 //
14 // TCPDF is free software: you can redistribute it and/or modify it
15 // under the terms of the GNU Lesser General Public License as
16 // published by the Free Software Foundation, either version 3 of the
17 // License, or (at your option) any later version.
18 //
19 // TCPDF is distributed in the hope that it will be useful, but
20 // WITHOUT ANY WARRANTY; without even the implied warranty of
21 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
22 // See the GNU Lesser General Public License for more details.
23 //
24 // You should have received a copy of the GNU Lesser General Public License
25 // along with TCPDF. If not, see <http://www.gnu.org/licenses/>.
26 //
27 // See LICENSE.TXT file for more information.
28 // -------------------------------------------------------------------
29 //
30 // DESCRIPTION :
31 //
32 // Class to create QR-code arrays for TCPDF class.
33 // QR Code symbol is a 2D barcode that can be scanned by
34 // handy terminals such as a mobile phone with CCD.
35 // The capacity of QR Code is up to 7000 digits or 4000
36 // characters, and has high robustness.
37 // This class supports QR Code model 2, described in
38 // JIS (Japanese Industrial Standards) X0510:2004
39 // or ISO/IEC 18004.
40 // Currently the following features are not supported:
41 // ECI and FNC1 mode, Micro QR Code, QR Code model 1,
42 // Structured mode.
43 //
44 // This class is derived from the following projects:
45 // ---------------------------------------------------------
46 // "PHP QR Code encoder"
47 // License: GNU-LGPLv3
48 // Copyright (C) 2010 by Dominik Dzienia <deltalab at poczta dot fm>
49 // http://phpqrcode.sourceforge.net/
50 // https://sourceforge.net/projects/phpqrcode/
51 //
52 // The "PHP QR Code encoder" is based on
53 // "C libqrencode library" (ver. 3.1.1)
54 // License: GNU-LGPL 2.1
55 // Copyright (C) 2006-2010 by Kentaro Fukuchi
56 // http://megaui.net/fukuchi/works/qrencode/index.en.html
57 //
58 // Reed-Solomon code encoder is written by Phil Karn, KA9Q.
59 // Copyright (C) 2002-2006 Phil Karn, KA9Q
60 //
61 // QR Code is registered trademark of DENSO WAVE INCORPORATED
62 // http://www.denso-wave.com/qrcode/index-e.html
63 // ---------------------------------------------------------
64 //============================================================+
65
66 /**
67 * @file
68 * Class to create QR-code arrays for TCPDF class.
69 * QR Code symbol is a 2D barcode that can be scanned by handy terminals such as a mobile phone with CCD.
70 * The capacity of QR Code is up to 7000 digits or 4000 characters, and has high robustness.
71 * This class supports QR Code model 2, described in JIS (Japanese Industrial Standards) X0510:2004 or ISO/IEC 18004.
72 * Currently the following features are not supported: ECI and FNC1 mode, Micro QR Code, QR Code model 1, Structured mode.
73 *
74 * This class is derived from "PHP QR Code encoder" by Dominik Dzienia (http://phpqrcode.sourceforge.net/) based on "libqrencode C library 3.1.1." by Kentaro Fukuchi (http://megaui.net/fukuchi/works/qrencode/index.en.html), contains Reed-Solomon code written by Phil Karn, KA9Q. QR Code is registered trademark of DENSO WAVE INCORPORATED (http://www.denso-wave.com/qrcode/index-e.html).
75 * Please read comments on this class source file for full copyright and license information.
76 *
77 * @package com.tecnick.tcpdf
78 * @author Nicola Asuni
79 * @version 1.0.009
80 */
81
82 // definitions
83 if (!defined('QRCODEDEFS')) {
84
85 /**
86 * Indicate that definitions for this class are set
87 */
88 define('QRCODEDEFS', true);
89
90 // -----------------------------------------------------
91
92 // Encoding modes (characters which can be encoded in QRcode)
93
94 /**
95 * Encoding mode
96 */
97 define('QR_MODE_NL', -1);
98
99 /**
100 * Encoding mode numeric (0-9). 3 characters are encoded to 10bit length. In theory, 7089 characters or less can be stored in a QRcode.
101 */
102 define('QR_MODE_NM', 0);
103
104 /**
105 * Encoding mode alphanumeric (0-9A-Z $%*+-./:) 45characters. 2 characters are encoded to 11bit length. In theory, 4296 characters or less can be stored in a QRcode.
106 */
107 define('QR_MODE_AN', 1);
108
109 /**
110 * Encoding mode 8bit byte data. In theory, 2953 characters or less can be stored in a QRcode.
111 */
112 define('QR_MODE_8B', 2);
113
114 /**
115 * Encoding mode KANJI. A KANJI character (multibyte character) is encoded to 13bit length. In theory, 1817 characters or less can be stored in a QRcode.
116 */
117 define('QR_MODE_KJ', 3);
118
119 /**
120 * Encoding mode STRUCTURED (currently unsupported)
121 */
122 define('QR_MODE_ST', 4);
123
124 // -----------------------------------------------------
125
126 // Levels of error correction.
127 // QRcode has a function of an error correcting for miss reading that white is black.
128 // Error correcting is defined in 4 level as below.
129
130 /**
131 * Error correction level L : About 7% or less errors can be corrected.
132 */
133 define('QR_ECLEVEL_L', 0);
134
135 /**
136 * Error correction level M : About 15% or less errors can be corrected.
137 */
138 define('QR_ECLEVEL_M', 1);
139
140 /**
141 * Error correction level Q : About 25% or less errors can be corrected.
142 */
143 define('QR_ECLEVEL_Q', 2);
144
145 /**
146 * Error correction level H : About 30% or less errors can be corrected.
147 */
148 define('QR_ECLEVEL_H', 3);
149
150 // -----------------------------------------------------
151
152 // Version. Size of QRcode is defined as version.
153 // Version is from 1 to 40.
154 // Version 1 is 21*21 matrix. And 4 modules increases whenever 1 version increases.
155 // So version 40 is 177*177 matrix.
156
157 /**
158 * Maximum QR Code version.
159 */
160 define('QRSPEC_VERSION_MAX', 40);
161
162 /**
163 * Maximum matrix size for maximum version (version 40 is 177*177 matrix).
164 */
165 define('QRSPEC_WIDTH_MAX', 177);
166
167 // -----------------------------------------------------
168
169 /**
170 * Matrix index to get width from $capacity array.
171 */
172 define('QRCAP_WIDTH', 0);
173
174 /**
175 * Matrix index to get number of words from $capacity array.
176 */
177 define('QRCAP_WORDS', 1);
178
179 /**
180 * Matrix index to get remainder from $capacity array.
181 */
182 define('QRCAP_REMINDER', 2);
183
184 /**
185 * Matrix index to get error correction level from $capacity array.
186 */
187 define('QRCAP_EC', 3);
188
189 // -----------------------------------------------------
190
191 // Structure (currently usupported)
192
193 /**
194 * Number of header bits for structured mode
195 */
196 define('STRUCTURE_HEADER_BITS', 20);
197
198 /**
199 * Max number of symbols for structured mode
200 */
201 define('MAX_STRUCTURED_SYMBOLS', 16);
202
203 // -----------------------------------------------------
204
205 // Masks
206
207 /**
208 * Down point base value for case 1 mask pattern (concatenation of same color in a line or a column)
209 */
210 define('N1', 3);
211
212 /**
213 * Down point base value for case 2 mask pattern (module block of same color)
214 */
215 define('N2', 3);
216
217 /**
218 * Down point base value for case 3 mask pattern (1:1:3:1:1(dark:bright:dark:bright:dark)pattern in a line or a column)
219 */
220 define('N3', 40);
221
222 /**
223 * Down point base value for case 4 mask pattern (ration of dark modules in whole)
224 */
225 define('N4', 10);
226
227 // -----------------------------------------------------
228
229 // Optimization settings
230
231 /**
232 * if true, estimates best mask (spec. default, but extremally slow; set to false to significant performance boost but (propably) worst quality code
233 */
234 define('QR_FIND_BEST_MASK', true);
235
236 /**
237 * if false, checks all masks available, otherwise value tells count of masks need to be checked, mask id are got randomly
238 */
239 define('QR_FIND_FROM_RANDOM', 2);
240
241 /**
242 * when QR_FIND_BEST_MASK === false
243 */
244 define('QR_DEFAULT_MASK', 2);
245
246 // -----------------------------------------------------
247
248 } // end of definitions
249
250 // #*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#
251
252 // for compatibility with PHP4
253 if (!function_exists('str_split')) {
254 /**
255 * Convert a string to an array (needed for PHP4 compatibility)
256 * @param $string (string) The input string.
257 * @param $split_length (int) Maximum length of the chunk.
258 * @return If the optional split_length parameter is specified, the returned array will be broken down into chunks with each being split_length in length, otherwise each chunk will be one character in length. FALSE is returned if split_length is less than 1. If the split_length length exceeds the length of string , the entire string is returned as the first (and only) array element.
259 */
260 function str_split($string, $split_length=1) {
261 if ((strlen($string) > $split_length) OR (!$split_length)) {
262 do {
263 $c = strlen($string);
264 $parts[] = substr($string, 0, $split_length);
265 $string = substr($string, $split_length);
266 } while ($string !== false);
267 } else {
268 $parts = array($string);
269 }
270 return $parts;
271 }
272 }
273
274 // #####################################################
275
276 /**
277 * @class QRcode
278 * Class to create QR-code arrays for TCPDF class.
279 * QR Code symbol is a 2D barcode that can be scanned by handy terminals such as a mobile phone with CCD.
280 * The capacity of QR Code is up to 7000 digits or 4000 characters, and has high robustness.
281 * This class supports QR Code model 2, described in JIS (Japanese Industrial Standards) X0510:2004 or ISO/IEC 18004.
282 * Currently the following features are not supported: ECI and FNC1 mode, Micro QR Code, QR Code model 1, Structured mode.
283 *
284 * This class is derived from "PHP QR Code encoder" by Dominik Dzienia (http://phpqrcode.sourceforge.net/) based on "libqrencode C library 3.1.1." by Kentaro Fukuchi (http://megaui.net/fukuchi/works/qrencode/index.en.html), contains Reed-Solomon code written by Phil Karn, KA9Q. QR Code is registered trademark of DENSO WAVE INCORPORATED (http://www.denso-wave.com/qrcode/index-e.html).
285 * Please read comments on this class source file for full copyright and license information.
286 *
287 * @package com.tecnick.tcpdf
288 * @author Nicola Asuni
289 * @version 1.0.009
290 */
291 class QRcode {
292
293 /**
294 * Barcode array to be returned which is readable by TCPDF.
295 * @protected
296 */
297 protected $barcode_array = array();
298
299 /**
300 * QR code version. Size of QRcode is defined as version. Version is from 1 to 40. Version 1 is 21*21 matrix. And 4 modules increases whenever 1 version increases. So version 40 is 177*177 matrix.
301 * @protected
302 */
303 protected $version = 0;
304
305 /**
306 * Levels of error correction. See definitions for possible values.
307 * @protected
308 */
309 protected $level = QR_ECLEVEL_L;
310
311 /**
312 * Encoding mode.
313 * @protected
314 */
315 protected $hint = QR_MODE_8B;
316
317 /**
318 * Boolean flag, if true the input string will be converted to uppercase.
319 * @protected
320 */
321 protected $casesensitive = true;
322
323 /**
324 * Structured QR code (not supported yet).
325 * @protected
326 */
327 protected $structured = 0;
328
329 /**
330 * Mask data.
331 * @protected
332 */
333 protected $data;
334
335 // FrameFiller
336
337 /**
338 * Width.
339 * @protected
340 */
341 protected $width;
342
343 /**
344 * Frame.
345 * @protected
346 */
347 protected $frame;
348
349 /**
350 * X position of bit.
351 * @protected
352 */
353 protected $x;
354
355 /**
356 * Y position of bit.
357 * @protected
358 */
359 protected $y;
360
361 /**
362 * Direction.
363 * @protected
364 */
365 protected $dir;
366
367 /**
368 * Single bit value.
369 * @protected
370 */
371 protected $bit;
372
373 // ---- QRrawcode ----
374
375 /**
376 * Data code.
377 * @protected
378 */
379 protected $datacode = array();
380
381 /**
382 * Error correction code.
383 * @protected
384 */
385 protected $ecccode = array();
386
387 /**
388 * Blocks.
389 * @protected
390 */
391 protected $blocks;
392
393 /**
394 * Reed-Solomon blocks.
395 * @protected
396 */
397 protected $rsblocks = array(); //of RSblock
398
399 /**
400 * Counter.
401 * @protected
402 */
403 protected $count;
404
405 /**
406 * Data length.
407 * @protected
408 */
409 protected $dataLength;
410
411 /**
412 * Error correction length.
413 * @protected
414 */
415 protected $eccLength;
416
417 /**
418 * Value b1.
419 * @protected
420 */
421 protected $b1;
422
423 // ---- QRmask ----
424
425 /**
426 * Run length.
427 * @protected
428 */
429 protected $runLength = array();
430
431 // ---- QRsplit ----
432
433 /**
434 * Input data string.
435 * @protected
436 */
437 protected $dataStr = '';
438
439 /**
440 * Input items.
441 * @protected
442 */
443 protected $items;
444
445 // Reed-Solomon items
446
447 /**
448 * Reed-Solomon items.
449 * @protected
450 */
451 protected $rsitems = array();
452
453 /**
454 * Array of frames.
455 * @protected
456 */
457 protected $frames = array();
458
459 /**
460 * Alphabet-numeric convesion table.
461 * @protected
462 */
463 protected $anTable = array(
464 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, //
465 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, //
466 36, -1, -1, -1, 37, 38, -1, -1, -1, -1, 39, 40, -1, 41, 42, 43, //
467 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 44, -1, -1, -1, -1, -1, //
468 -1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, //
469 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1, //
470 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, //
471 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 //
472 );
473
474 /**
475 * Array Table of the capacity of symbols.
476 * See Table 1 (pp.13) and Table 12-16 (pp.30-36), JIS X0510:2004.
477 * @protected
478 */
479 protected $capacity = array(
480 array( 0, 0, 0, array( 0, 0, 0, 0)), //
481 array( 21, 26, 0, array( 7, 10, 13, 17)), // 1
482 array( 25, 44, 7, array( 10, 16, 22, 28)), //
483 array( 29, 70, 7, array( 15, 26, 36, 44)), //
484 array( 33, 100, 7, array( 20, 36, 52, 64)), //
485 array( 37, 134, 7, array( 26, 48, 72, 88)), // 5
486 array( 41, 172, 7, array( 36, 64, 96, 112)), //
487 array( 45, 196, 0, array( 40, 72, 108, 130)), //
488 array( 49, 242, 0, array( 48, 88, 132, 156)), //
489 array( 53, 292, 0, array( 60, 110, 160, 192)), //
490 array( 57, 346, 0, array( 72, 130, 192, 224)), // 10
491 array( 61, 404, 0, array( 80, 150, 224, 264)), //
492 array( 65, 466, 0, array( 96, 176, 260, 308)), //
493 array( 69, 532, 0, array( 104, 198, 288, 352)), //
494 array( 73, 581, 3, array( 120, 216, 320, 384)), //
495 array( 77, 655, 3, array( 132, 240, 360, 432)), // 15
496 array( 81, 733, 3, array( 144, 280, 408, 480)), //
497 array( 85, 815, 3, array( 168, 308, 448, 532)), //
498 array( 89, 901, 3, array( 180, 338, 504, 588)), //
499 array( 93, 991, 3, array( 196, 364, 546, 650)), //
500 array( 97, 1085, 3, array( 224, 416, 600, 700)), // 20
501 array(101, 1156, 4, array( 224, 442, 644, 750)), //
502 array(105, 1258, 4, array( 252, 476, 690, 816)), //
503 array(109, 1364, 4, array( 270, 504, 750, 900)), //
504 array(113, 1474, 4, array( 300, 560, 810, 960)), //
505 array(117, 1588, 4, array( 312, 588, 870, 1050)), // 25
506 array(121, 1706, 4, array( 336, 644, 952, 1110)), //
507 array(125, 1828, 4, array( 360, 700, 1020, 1200)), //
508 array(129, 1921, 3, array( 390, 728, 1050, 1260)), //
509 array(133, 2051, 3, array( 420, 784, 1140, 1350)), //
510 array(137, 2185, 3, array( 450, 812, 1200, 1440)), // 30
511 array(141, 2323, 3, array( 480, 868, 1290, 1530)), //
512 array(145, 2465, 3, array( 510, 924, 1350, 1620)), //
513 array(149, 2611, 3, array( 540, 980, 1440, 1710)), //
514 array(153, 2761, 3, array( 570, 1036, 1530, 1800)), //
515 array(157, 2876, 0, array( 570, 1064, 1590, 1890)), // 35
516 array(161, 3034, 0, array( 600, 1120, 1680, 1980)), //
517 array(165, 3196, 0, array( 630, 1204, 1770, 2100)), //
518 array(169, 3362, 0, array( 660, 1260, 1860, 2220)), //
519 array(173, 3532, 0, array( 720, 1316, 1950, 2310)), //
520 array(177, 3706, 0, array( 750, 1372, 2040, 2430)) // 40
521 );
522
523 /**
524 * Array Length indicator.
525 * @protected
526 */
527 protected $lengthTableBits = array(
528 array(10, 12, 14),
529 array( 9, 11, 13),
530 array( 8, 16, 16),
531 array( 8, 10, 12)
532 );
533
534 /**
535 * Array Table of the error correction code (Reed-Solomon block).
536 * See Table 12-16 (pp.30-36), JIS X0510:2004.
537 * @protected
538 */
539 protected $eccTable = array(
540 array(array( 0, 0), array( 0, 0), array( 0, 0), array( 0, 0)), //
541 array(array( 1, 0), array( 1, 0), array( 1, 0), array( 1, 0)), // 1
542 array(array( 1, 0), array( 1, 0), array( 1, 0), array( 1, 0)), //
543 array(array( 1, 0), array( 1, 0), array( 2, 0), array( 2, 0)), //
544 array(array( 1, 0), array( 2, 0), array( 2, 0), array( 4, 0)), //
545 array(array( 1, 0), array( 2, 0), array( 2, 2), array( 2, 2)), // 5
546 array(array( 2, 0), array( 4, 0), array( 4, 0), array( 4, 0)), //
547 array(array( 2, 0), array( 4, 0), array( 2, 4), array( 4, 1)), //
548 array(array( 2, 0), array( 2, 2), array( 4, 2), array( 4, 2)), //
549 array(array( 2, 0), array( 3, 2), array( 4, 4), array( 4, 4)), //
550 array(array( 2, 2), array( 4, 1), array( 6, 2), array( 6, 2)), // 10
551 array(array( 4, 0), array( 1, 4), array( 4, 4), array( 3, 8)), //
552 array(array( 2, 2), array( 6, 2), array( 4, 6), array( 7, 4)), //
553 array(array( 4, 0), array( 8, 1), array( 8, 4), array(12, 4)), //
554 array(array( 3, 1), array( 4, 5), array(11, 5), array(11, 5)), //
555 array(array( 5, 1), array( 5, 5), array( 5, 7), array(11, 7)), // 15
556 array(array( 5, 1), array( 7, 3), array(15, 2), array( 3, 13)), //
557 array(array( 1, 5), array(10, 1), array( 1, 15), array( 2, 17)), //
558 array(array( 5, 1), array( 9, 4), array(17, 1), array( 2, 19)), //
559 array(array( 3, 4), array( 3, 11), array(17, 4), array( 9, 16)), //
560 array(array( 3, 5), array( 3, 13), array(15, 5), array(15, 10)), // 20
561 array(array( 4, 4), array(17, 0), array(17, 6), array(19, 6)), //
562 array(array( 2, 7), array(17, 0), array( 7, 16), array(34, 0)), //
563 array(array( 4, 5), array( 4, 14), array(11, 14), array(16, 14)), //
564 array(array( 6, 4), array( 6, 14), array(11, 16), array(30, 2)), //
565 array(array( 8, 4), array( 8, 13), array( 7, 22), array(22, 13)), // 25
566 array(array(10, 2), array(19, 4), array(28, 6), array(33, 4)), //
567 array(array( 8, 4), array(22, 3), array( 8, 26), array(12, 28)), //
568 array(array( 3, 10), array( 3, 23), array( 4, 31), array(11, 31)), //
569 array(array( 7, 7), array(21, 7), array( 1, 37), array(19, 26)), //
570 array(array( 5, 10), array(19, 10), array(15, 25), array(23, 25)), // 30
571 array(array(13, 3), array( 2, 29), array(42, 1), array(23, 28)), //
572 array(array(17, 0), array(10, 23), array(10, 35), array(19, 35)), //
573 array(array(17, 1), array(14, 21), array(29, 19), array(11, 46)), //
574 array(array(13, 6), array(14, 23), array(44, 7), array(59, 1)), //
575 array(array(12, 7), array(12, 26), array(39, 14), array(22, 41)), // 35
576 array(array( 6, 14), array( 6, 34), array(46, 10), array( 2, 64)), //
577 array(array(17, 4), array(29, 14), array(49, 10), array(24, 46)), //
578 array(array( 4, 18), array(13, 32), array(48, 14), array(42, 32)), //
579 array(array(20, 4), array(40, 7), array(43, 22), array(10, 67)), //
580 array(array(19, 6), array(18, 31), array(34, 34), array(20, 61)) // 40
581 );
582
583 /**
584 * Array Positions of alignment patterns.
585 * This array includes only the second and the third position of the alignment patterns. Rest of them can be calculated from the distance between them.
586 * See Table 1 in Appendix E (pp.71) of JIS X0510:2004.
587 * @protected
588 */
589 protected $alignmentPattern = array(
590 array( 0, 0),
591 array( 0, 0), array(18, 0), array(22, 0), array(26, 0), array(30, 0), // 1- 5
592 array(34, 0), array(22, 38), array(24, 42), array(26, 46), array(28, 50), // 6-10
593 array(30, 54), array(32, 58), array(34, 62), array(26, 46), array(26, 48), // 11-15
594 array(26, 50), array(30, 54), array(30, 56), array(30, 58), array(34, 62), // 16-20
595 array(28, 50), array(26, 50), array(30, 54), array(28, 54), array(32, 58), // 21-25
596 array(30, 58), array(34, 62), array(26, 50), array(30, 54), array(26, 52), // 26-30
597 array(30, 56), array(34, 60), array(30, 58), array(34, 62), array(30, 54), // 31-35
598 array(24, 50), array(28, 54), array(32, 58), array(26, 54), array(30, 58) // 35-40
599 );
600
601 /**
602 * Array Version information pattern (BCH coded).
603 * See Table 1 in Appendix D (pp.68) of JIS X0510:2004.
604 * size: [QRSPEC_VERSION_MAX - 6]
605 * @protected
606 */
607 protected $versionPattern = array(
608 0x07c94, 0x085bc, 0x09a99, 0x0a4d3, 0x0bbf6, 0x0c762, 0x0d847, 0x0e60d, //
609 0x0f928, 0x10b78, 0x1145d, 0x12a17, 0x13532, 0x149a6, 0x15683, 0x168c9, //
610 0x177ec, 0x18ec4, 0x191e1, 0x1afab, 0x1b08e, 0x1cc1a, 0x1d33f, 0x1ed75, //
611 0x1f250, 0x209d5, 0x216f0, 0x228ba, 0x2379f, 0x24b0b, 0x2542e, 0x26a64, //
612 0x27541, 0x28c69
613 );
614
615 /**
616 * Array Format information
617 * @protected
618 */
619 protected $formatInfo = array(
620 array(0x77c4, 0x72f3, 0x7daa, 0x789d, 0x662f, 0x6318, 0x6c41, 0x6976), //
621 array(0x5412, 0x5125, 0x5e7c, 0x5b4b, 0x45f9, 0x40ce, 0x4f97, 0x4aa0), //
622 array(0x355f, 0x3068, 0x3f31, 0x3a06, 0x24b4, 0x2183, 0x2eda, 0x2bed), //
623 array(0x1689, 0x13be, 0x1ce7, 0x19d0, 0x0762, 0x0255, 0x0d0c, 0x083b) //
624 );
625
626
627 // -------------------------------------------------
628 // -------------------------------------------------
629
630
631 /**
632 * This is the class constructor.
633 * Creates a QRcode object
634 * @param $code (string) code to represent using QRcode
635 * @param $eclevel (string) error level: <ul><li>L : About 7% or less errors can be corrected.</li><li>M : About 15% or less errors can be corrected.</li><li>Q : About 25% or less errors can be corrected.</li><li>H : About 30% or less errors can be corrected.</li></ul>
636 * @public
637 * @since 1.0.000
638 */
639 public function __construct($code, $eclevel = 'L') {
640 $barcode_array = array();
641 if ((is_null($code)) OR ($code == '\0') OR ($code == '')) {
642 return false;
643 }
644 // set error correction level
645 $this->level = array_search($eclevel, array('L', 'M', 'Q', 'H'));
646 if ($this->level === false) {
647 $this->level = QR_ECLEVEL_L;
648 }
649 if (($this->hint != QR_MODE_8B) AND ($this->hint != QR_MODE_KJ)) {
650 return false;
651 }
652 if (($this->version < 0) OR ($this->version > QRSPEC_VERSION_MAX)) {
653 return false;
654 }
655 $this->items = array();
656 $this->encodeString($code);
657 if (is_null($this->data)) {
658 return false;
659 }
660 $qrTab = $this->binarize($this->data);
661 $size = count($qrTab);
662 $barcode_array['num_rows'] = $size;
663 $barcode_array['num_cols'] = $size;
664 $barcode_array['bcode'] = array();
665 foreach ($qrTab as $line) {
666 $arrAdd = array();
667 foreach (str_split($line) as $char) {
668 $arrAdd[] = ($char=='1')?1:0;
669 }
670 $barcode_array['bcode'][] = $arrAdd;
671 }
672 $this->barcode_array = $barcode_array;
673 }
674
675 /**
676 * Returns a barcode array which is readable by TCPDF
677 * @return array barcode array readable by TCPDF;
678 * @public
679 */
680 public function getBarcodeArray() {
681 return $this->barcode_array;
682 }
683
684 /**
685 * Convert the frame in binary form
686 * @param $frame (array) array to binarize
687 * @return array frame in binary form
688 */
689 protected function binarize($frame) {
690 $len = count($frame);
691 // the frame is square (width = height)
692 foreach ($frame as &$frameLine) {
693 for ($i=0; $i<$len; $i++) {
694 $frameLine[$i] = (ord($frameLine[$i])&1)?'1':'0';
695 }
696 }
697 return $frame;
698 }
699
700 /**
701 * Encode the input string to QR code
702 * @param $string (string) input string to encode
703 */
704 protected function encodeString($string) {
705 $this->dataStr = $string;
706 if (!$this->casesensitive) {
707 $this->toUpper();
708 }
709 $ret = $this->splitString();
710 if ($ret < 0) {
711 return NULL;
712 }
713 $this->encodeMask(-1);
714 }
715
716 /**
717 * Encode mask
718 * @param $mask (int) masking mode
719 */
720 protected function encodeMask($mask) {
721 $spec = array(0, 0, 0, 0, 0);
722 $this->datacode = $this->getByteStream($this->items);
723 if (is_null($this->datacode)) {
724 return NULL;
725 }
726 $spec = $this->getEccSpec($this->version, $this->level, $spec);
727 $this->b1 = $this->rsBlockNum1($spec);
728 $this->dataLength = $this->rsDataLength($spec);
729 $this->eccLength = $this->rsEccLength($spec);
730 $this->ecccode = array_fill(0, $this->eccLength, 0);
731 $this->blocks = $this->rsBlockNum($spec);
732 $ret = $this->init($spec);
733 if ($ret < 0) {
734 return NULL;
735 }
736 $this->count = 0;
737 $this->width = $this->getWidth($this->version);
738 $this->frame = $this->newFrame($this->version);
739 $this->x = $this->width - 1;
740 $this->y = $this->width - 1;
741 $this->dir = -1;
742 $this->bit = -1;
743 // inteleaved data and ecc codes
744 for ($i=0; $i < ($this->dataLength + $this->eccLength); $i++) {
745 $code = $this->getCode();
746 $bit = 0x80;
747 for ($j=0; $j<8; $j++) {
748 $addr = $this->getNextPosition();
749 $this->setFrameAt($addr, 0x02 | (($bit & $code) != 0));
750 $bit = $bit >> 1;
751 }
752 }
753 // remainder bits
754 $j = $this->getRemainder($this->version);
755 for ($i=0; $i<$j; $i++) {
756 $addr = $this->getNextPosition();
757 $this->setFrameAt($addr, 0x02);
758 }
759 // masking
760 $this->runLength = array_fill(0, QRSPEC_WIDTH_MAX + 1, 0);
761 if ($mask < 0) {
762 if (QR_FIND_BEST_MASK) {
763 $masked = $this->mask($this->width, $this->frame, $this->level);
764 } else {
765 $masked = $this->makeMask($this->width, $this->frame, (intval(QR_DEFAULT_MASK) % 8), $this->level);
766 }
767 } else {
768 $masked = $this->makeMask($this->width, $this->frame, $mask, $this->level);
769 }
770 if ($masked == NULL) {
771 return NULL;
772 }
773 $this->data = $masked;
774 }
775
776 // - - - - - - - - - - - - - - - - - - - - - - - - -
777
778 // FrameFiller
779
780 /**
781 * Set frame value at specified position
782 * @param $at (array) x,y position
783 * @param $val (int) value of the character to set
784 */
785 protected function setFrameAt($at, $val) {
786 $this->frame[$at['y']][$at['x']] = chr($val);
787 }
788
789 /**
790 * Get frame value at specified position
791 * @param $at (array) x,y position
792 * @return value at specified position
793 */
794 protected function getFrameAt($at) {
795 return ord($this->frame[$at['y']][$at['x']]);
796 }
797
798 /**
799 * Return the next frame position
800 * @return array of x,y coordinates
801 */
802 protected function getNextPosition() {
803 do {
804 if ($this->bit == -1) {
805 $this->bit = 0;
806 return array('x'=>$this->x, 'y'=>$this->y);
807 }
808 $x = $this->x;
809 $y = $this->y;
810 $w = $this->width;
811 if ($this->bit == 0) {
812 $x--;
813 $this->bit++;
814 } else {
815 $x++;
816 $y += $this->dir;
817 $this->bit--;
818 }
819 if ($this->dir < 0) {
820 if ($y < 0) {
821 $y = 0;
822 $x -= 2;
823 $this->dir = 1;
824 if ($x == 6) {
825 $x--;
826 $y = 9;
827 }
828 }
829 } else {
830 if ($y == $w) {
831 $y = $w - 1;
832 $x -= 2;
833 $this->dir = -1;
834 if ($x == 6) {
835 $x--;
836 $y -= 8;
837 }
838 }
839 }
840 if (($x < 0) OR ($y < 0)) {
841 return NULL;
842 }
843 $this->x = $x;
844 $this->y = $y;
845 } while(ord($this->frame[$y][$x]) & 0x80);
846 return array('x'=>$x, 'y'=>$y);
847 }
848
849 // - - - - - - - - - - - - - - - - - - - - - - - - -
850
851 // QRrawcode
852
853 /**
854 * Initialize code.
855 * @param $spec (array) array of ECC specification
856 * @return 0 in case of success, -1 in case of error
857 */
858 protected function init($spec) {
859 $dl = $this->rsDataCodes1($spec);
860 $el = $this->rsEccCodes1($spec);
861 $rs = $this->init_rs(8, 0x11d, 0, 1, $el, 255 - $dl - $el);
862 $blockNo = 0;
863 $dataPos = 0;
864 $eccPos = 0;
865 $endfor = $this->rsBlockNum1($spec);
866 for ($i=0; $i < $endfor; ++$i) {
867 $ecc = array_slice($this->ecccode, $eccPos);
868 $this->rsblocks[$blockNo] = array();
869 $this->rsblocks[$blockNo]['dataLength'] = $dl;
870 $this->rsblocks[$blockNo]['data'] = array_slice($this->datacode, $dataPos);
871 $this->rsblocks[$blockNo]['eccLength'] = $el;
872 $ecc = $this->encode_rs_char($rs, $this->rsblocks[$blockNo]['data'], $ecc);
873 $this->rsblocks[$blockNo]['ecc'] = $ecc;
874 $this->ecccode = array_merge(array_slice($this->ecccode,0, $eccPos), $ecc);
875 $dataPos += $dl;
876 $eccPos += $el;
877 $blockNo++;
878 }
879 if ($this->rsBlockNum2($spec) == 0) {
880 return 0;
881 }
882 $dl = $this->rsDataCodes2($spec);
883 $el = $this->rsEccCodes2($spec);
884 $rs = $this->init_rs(8, 0x11d, 0, 1, $el, 255 - $dl - $el);
885 if ($rs == NULL) {
886 return -1;
887 }
888 $endfor = $this->rsBlockNum2($spec);
889 for ($i=0; $i < $endfor; ++$i) {
890 $ecc = array_slice($this->ecccode, $eccPos);
891 $this->rsblocks[$blockNo] = array();
892 $this->rsblocks[$blockNo]['dataLength'] = $dl;
893 $this->rsblocks[$blockNo]['data'] = array_slice($this->datacode, $dataPos);
894 $this->rsblocks[$blockNo]['eccLength'] = $el;
895 $ecc = $this->encode_rs_char($rs, $this->rsblocks[$blockNo]['data'], $ecc);
896 $this->rsblocks[$blockNo]['ecc'] = $ecc;
897 $this->ecccode = array_merge(array_slice($this->ecccode, 0, $eccPos), $ecc);
898 $dataPos += $dl;
899 $eccPos += $el;
900 $blockNo++;
901 }
902 return 0;
903 }
904
905 /**
906 * Return Reed-Solomon block code.
907 * @return array rsblocks
908 */
909 protected function getCode() {
910 if ($this->count < $this->dataLength) {
911 $row = $this->count % $this->blocks;
912 $col = $this->count / $this->blocks;
913 if ($col >= $this->rsblocks[0]['dataLength']) {
914 $row += $this->b1;
915 }
916 $ret = $this->rsblocks[$row]['data'][$col];
917 } elseif ($this->count < $this->dataLength + $this->eccLength) {
918 $row = ($this->count - $this->dataLength) % $this->blocks;
919 $col = ($this->count - $this->dataLength) / $this->blocks;
920 $ret = $this->rsblocks[$row]['ecc'][$col];
921 } else {
922 return 0;
923 }
924 $this->count++;
925 return $ret;
926 }
927
928 // - - - - - - - - - - - - - - - - - - - - - - - - -
929
930 // QRmask
931
932 /**
933 * Write Format Information on frame and returns the number of black bits
934 * @param $width (int) frame width
935 * @param $frame (array) frame
936 * @param $mask (array) masking mode
937 * @param $level (int) error correction level
938 * @return int blacks
939 */
940 protected function writeFormatInformation($width, &$frame, $mask, $level) {
941 $blacks = 0;
942 $format = $this->getFormatInfo($mask, $level);
943 for ($i=0; $i<8; ++$i) {
944 if ($format & 1) {
945 $blacks += 2;
946 $v = 0x85;
947 } else {
948 $v = 0x84;
949 }
950 $frame[8][$width - 1 - $i] = chr($v);
951 if ($i < 6) {
952 $frame[$i][8] = chr($v);
953 } else {
954 $frame[$i + 1][8] = chr($v);
955 }
956 $format = $format >> 1;
957 }
958 for ($i=0; $i<7; ++$i) {
959 if ($format & 1) {
960 $blacks += 2;
961 $v = 0x85;
962 } else {
963 $v = 0x84;
964 }
965 $frame[$width - 7 + $i][8] = chr($v);
966 if ($i == 0) {
967 $frame[8][7] = chr($v);
968 } else {
969 $frame[8][6 - $i] = chr($v);
970 }
971 $format = $format >> 1;
972 }
973 return $blacks;
974 }
975
976 /**
977 * mask0
978 * @param $x (int) X position
979 * @param $y (int) Y position
980 * @return int mask
981 */
982 protected function mask0($x, $y) {
983 return ($x + $y) & 1;
984 }
985
986 /**
987 * mask1
988 * @param $x (int) X position
989 * @param $y (int) Y position
990 * @return int mask
991 */
992 protected function mask1($x, $y) {
993 return ($y & 1);
994 }
995
996 /**
997 * mask2
998 * @param $x (int) X position
999 * @param $y (int) Y position
1000 * @return int mask
1001 */
1002 protected function mask2($x, $y) {
1003 return ($x % 3);
1004 }
1005
1006 /**
1007 * mask3
1008 * @param $x (int) X position
1009 * @param $y (int) Y position
1010 * @return int mask
1011 */
1012 protected function mask3($x, $y) {
1013 return ($x + $y) % 3;
1014 }
1015
1016 /**
1017 * mask4
1018 * @param $x (int) X position
1019 * @param $y (int) Y position
1020 * @return int mask
1021 */
1022 protected function mask4($x, $y) {
1023 return (((int)($y / 2)) + ((int)($x / 3))) & 1;
1024 }
1025
1026 /**
1027 * mask5
1028 * @param $x (int) X position
1029 * @param $y (int) Y position
1030 * @return int mask
1031 */
1032 protected function mask5($x, $y) {
1033 return (($x * $y) & 1) + ($x * $y) % 3;
1034 }
1035
1036 /**
1037 * mask6
1038 * @param $x (int) X position
1039 * @param $y (int) Y position
1040 * @return int mask
1041 */
1042 protected function mask6($x, $y) {
1043 return ((($x * $y) & 1) + ($x * $y) % 3) & 1;
1044 }
1045
1046 /**
1047 * mask7
1048 * @param $x (int) X position
1049 * @param $y (int) Y position
1050 * @return int mask
1051 */
1052 protected function mask7($x, $y) {
1053 return ((($x * $y) % 3) + (($x + $y) & 1)) & 1;
1054 }
1055
1056 /**
1057 * Return bitmask
1058 * @param $maskNo (int) mask number
1059 * @param $width (int) width
1060 * @param $frame (array) frame
1061 * @return array bitmask
1062 */
1063 protected function generateMaskNo($maskNo, $width, $frame) {
1064 $bitMask = array_fill(0, $width, array_fill(0, $width, 0));
1065 for ($y=0; $y<$width; ++$y) {
1066 for ($x=0; $x<$width; ++$x) {
1067 if (ord($frame[$y][$x]) & 0x80) {
1068 $bitMask[$y][$x] = 0;
1069 } else {
1070 $maskFunc = call_user_func(array($this, 'mask'.$maskNo), $x, $y);
1071 $bitMask[$y][$x] = ($maskFunc == 0)?1:0;
1072 }
1073 }
1074 }
1075 return $bitMask;
1076 }
1077
1078 /**
1079 * makeMaskNo
1080 * @param $maskNo (int)
1081 * @param $width (int)
1082 * @param $s (int)
1083 * @param $d (int)
1084 * @param $maskGenOnly (boolean)
1085 * @return int b
1086 */
1087 protected function makeMaskNo($maskNo, $width, $s, &$d, $maskGenOnly=false) {
1088 $b = 0;
1089 $bitMask = array();
1090 $bitMask = $this->generateMaskNo($maskNo, $width, $s, $d);
1091 if ($maskGenOnly) {
1092 return;
1093 }
1094 $d = $s;
1095 for ($y=0; $y<$width; ++$y) {
1096 for ($x=0; $x<$width; ++$x) {
1097 if ($bitMask[$y][$x] == 1) {
1098 $d[$y][$x] = chr(ord($s[$y][$x]) ^ ((int)($bitMask[$y][$x])));
1099 }
1100 $b += (int)(ord($d[$y][$x]) & 1);
1101 }
1102 }
1103 return $b;
1104 }
1105
1106 /**
1107 * makeMask
1108 * @param $width (int)
1109 * @param $frame (array)
1110 * @param $maskNo (int)
1111 * @param $level (int)
1112 * @return array mask
1113 */
1114 protected function makeMask($width, $frame, $maskNo, $level) {
1115 $masked = array_fill(0, $width, str_repeat("\0", $width));
1116 $this->makeMaskNo($maskNo, $width, $frame, $masked);
1117 $this->writeFormatInformation($width, $masked, $maskNo, $level);
1118 return $masked;
1119 }
1120
1121 /**
1122 * calcN1N3
1123 * @param $length (int)
1124 * @return int demerit
1125 */
1126 protected function calcN1N3($length) {
1127 $demerit = 0;
1128 for ($i=0; $i<$length; ++$i) {
1129 if ($this->runLength[$i] >= 5) {
1130 $demerit += (N1 + ($this->runLength[$i] - 5));
1131 }
1132 if ($i & 1) {
1133 if (($i >= 3) AND ($i < ($length-2)) AND ($this->runLength[$i] % 3 == 0)) {
1134 $fact = (int)($this->runLength[$i] / 3);
1135 if (($this->runLength[$i-2] == $fact)
1136 AND ($this->runLength[$i-1] == $fact)
1137 AND ($this->runLength[$i+1] == $fact)
1138 AND ($this->runLength[$i+2] == $fact)) {
1139 if (($this->runLength[$i-3] < 0) OR ($this->runLength[$i-3] >= (4 * $fact))) {
1140 $demerit += N3;
1141 } elseif ((($i+3) >= $length) OR ($this->runLength[$i+3] >= (4 * $fact))) {
1142 $demerit += N3;
1143 }
1144 }
1145 }
1146 }
1147 }
1148 return $demerit;
1149 }
1150
1151 /**
1152 * evaluateSymbol
1153 * @param $width (int)
1154 * @param $frame (array)
1155 * @return int demerit
1156 */
1157 protected function evaluateSymbol($width, $frame) {
1158 $head = 0;
1159 $demerit = 0;
1160 for ($y=0; $y<$width; ++$y) {
1161 $head = 0;
1162 $this->runLength[0] = 1;
1163 $frameY = $frame[$y];
1164 if ($y > 0) {
1165 $frameYM = $frame[$y-1];
1166 }
1167 for ($x=0; $x<$width; ++$x) {
1168 if (($x > 0) AND ($y > 0)) {
1169 $b22 = ord($frameY[$x]) & ord($frameY[$x-1]) & ord($frameYM[$x]) & ord($frameYM[$x-1]);
1170 $w22 = ord($frameY[$x]) | ord($frameY[$x-1]) | ord($frameYM[$x]) | ord($frameYM[$x-1]);
1171 if (($b22 | ($w22 ^ 1)) & 1) {
1172 $demerit += N2;
1173 }
1174 }
1175 if (($x == 0) AND (ord($frameY[$x]) & 1)) {
1176 $this->runLength[0] = -1;
1177 $head = 1;
1178 $this->runLength[$head] = 1;
1179 } elseif ($x > 0) {
1180 if ((ord($frameY[$x]) ^ ord($frameY[$x-1])) & 1) {
1181 $head++;
1182 $this->runLength[$head] = 1;
1183 } else {
1184 $this->runLength[$head]++;
1185 }
1186 }
1187 }
1188 $demerit += $this->calcN1N3($head+1);
1189 }
1190 for ($x=0; $x<$width; ++$x) {
1191 $head = 0;
1192 $this->runLength[0] = 1;
1193 for ($y=0; $y<$width; ++$y) {
1194 if (($y == 0) AND (ord($frame[$y][$x]) & 1)) {
1195 $this->runLength[0] = -1;
1196 $head = 1;
1197 $this->runLength[$head] = 1;
1198 } elseif ($y > 0) {
1199 if ((ord($frame[$y][$x]) ^ ord($frame[$y-1][$x])) & 1) {
1200 $head++;
1201 $this->runLength[$head] = 1;
1202 } else {
1203 $this->runLength[$head]++;
1204 }
1205 }
1206 }
1207 $demerit += $this->calcN1N3($head+1);
1208 }
1209 return $demerit;
1210 }
1211
1212 /**
1213 * mask
1214 * @param $width (int)
1215 * @param $frame (array)
1216 * @param $level (int)
1217 * @return array best mask
1218 */
1219 protected function mask($width, $frame, $level) {
1220 $minDemerit = PHP_INT_MAX;
1221 $bestMaskNum = 0;
1222 $bestMask = array();
1223 $checked_masks = array(0, 1, 2, 3, 4, 5, 6, 7);
1224 if (QR_FIND_FROM_RANDOM !== false) {
1225 $howManuOut = 8 - (QR_FIND_FROM_RANDOM % 9);
1226 for ($i = 0; $i < $howManuOut; ++$i) {
1227 $remPos = rand (0, count($checked_masks)-1);
1228 unset($checked_masks[$remPos]);
1229 $checked_masks = array_values($checked_masks);
1230 }
1231 }
1232 $bestMask = $frame;
1233 foreach ($checked_masks as $i) {
1234 $mask = array_fill(0, $width, str_repeat("\0", $width));
1235 $demerit = 0;
1236 $blacks = 0;
1237 $blacks = $this->makeMaskNo($i, $width, $frame, $mask);
1238 $blacks += $this->writeFormatInformation($width, $mask, $i, $level);
1239 $blacks = (int)(100 * $blacks / ($width * $width));
1240 $demerit = (int)((int)(abs($blacks - 50) / 5) * N4);
1241 $demerit += $this->evaluateSymbol($width, $mask);
1242 if ($demerit < $minDemerit) {
1243 $minDemerit = $demerit;
1244 $bestMask = $mask;
1245 $bestMaskNum = $i;
1246 }
1247 }
1248 return $bestMask;
1249 }
1250
1251 // - - - - - - - - - - - - - - - - - - - - - - - - -
1252
1253 // QRsplit
1254
1255 /**
1256 * Return true if the character at specified position is a number
1257 * @param $str (string) string
1258 * @param $pos (int) characted position
1259 * @return boolean true of false
1260 */
1261 protected function isdigitat($str, $pos) {
1262 if ($pos >= strlen($str)) {
1263 return false;
1264 }
1265 return ((ord($str[$pos]) >= ord('0'))&&(ord($str[$pos]) <= ord('9')));
1266 }
1267
1268 /**
1269 * Return true if the character at specified position is an alphanumeric character
1270 * @param $str (string) string
1271 * @param $pos (int) characted position
1272 * @return boolean true of false
1273 */
1274 protected function isalnumat($str, $pos) {
1275 if ($pos >= strlen($str)) {
1276 return false;
1277 }
1278 return ($this->lookAnTable(ord($str[$pos])) >= 0);
1279 }
1280
1281 /**
1282 * identifyMode
1283 * @param $pos (int)
1284 * @return int mode
1285 */
1286 protected function identifyMode($pos) {
1287 if ($pos >= strlen($this->dataStr)) {
1288 return QR_MODE_NL;
1289 }
1290 $c = $this->dataStr[$pos];
1291 if ($this->isdigitat($this->dataStr, $pos)) {
1292 return QR_MODE_NM;
1293 } elseif ($this->isalnumat($this->dataStr, $pos)) {
1294 return QR_MODE_AN;
1295 } elseif ($this->hint == QR_MODE_KJ) {
1296 if ($pos+1 < strlen($this->dataStr)) {
1297 $d = $this->dataStr[$pos+1];
1298 $word = (ord($c) << 8) | ord($d);
1299 if (($word >= 0x8140 && $word <= 0x9ffc) OR ($word >= 0xe040 && $word <= 0xebbf)) {
1300 return QR_MODE_KJ;
1301 }
1302 }
1303 }
1304 return QR_MODE_8B;
1305 }
1306
1307 /**
1308 * eatNum
1309 * @return int run
1310 */
1311 protected function eatNum() {
1312 $ln = $this->lengthIndicator(QR_MODE_NM, $this->version);
1313 $p = 0;
1314 while($this->isdigitat($this->dataStr, $p)) {
1315 $p++;
1316 }
1317 $run = $p;
1318 $mode = $this->identifyMode($p);
1319 if ($mode == QR_MODE_8B) {
1320 $dif = $this->estimateBitsModeNum($run) + 4 + $ln
1321 + $this->estimateBitsMode8(1) // + 4 + l8
1322 - $this->estimateBitsMode8($run + 1); // - 4 - l8
1323 if ($dif > 0) {
1324 return $this->eat8();
1325 }
1326 }
1327 if ($mode == QR_MODE_AN) {
1328 $dif = $this->estimateBitsModeNum($run) + 4 + $ln
1329 + $this->estimateBitsModeAn(1) // + 4 + la
1330 - $this->estimateBitsModeAn($run + 1);// - 4 - la
1331 if ($dif > 0) {
1332 return $this->eatAn();
1333 }
1334 }
1335 $this->items = $this->appendNewInputItem($this->items, QR_MODE_NM, $run, str_split($this->dataStr));
1336 return $run;
1337 }
1338
1339 /**
1340 * eatAn
1341 * @return int run
1342 */
1343 protected function eatAn() {
1344 $la = $this->lengthIndicator(QR_MODE_AN, $this->version);
1345 $ln = $this->lengthIndicator(QR_MODE_NM, $this->version);
1346 $p =1 ;
1347 while($this->isalnumat($this->dataStr, $p)) {
1348 if ($this->isdigitat($this->dataStr, $p)) {
1349 $q = $p;
1350 while($this->isdigitat($this->dataStr, $q)) {
1351 $q++;
1352 }
1353 $dif = $this->estimateBitsModeAn($p) // + 4 + la
1354 + $this->estimateBitsModeNum($q - $p) + 4 + $ln
1355 - $this->estimateBitsModeAn($q); // - 4 - la
1356 if ($dif < 0) {
1357 break;
1358 } else {
1359 $p = $q;
1360 }
1361 } else {
1362 $p++;
1363 }
1364 }
1365 $run = $p;
1366 if (!$this->isalnumat($this->dataStr, $p)) {
1367 $dif = $this->estimateBitsModeAn($run) + 4 + $la
1368 + $this->estimateBitsMode8(1) // + 4 + l8
1369 - $this->estimateBitsMode8($run + 1); // - 4 - l8
1370 if ($dif > 0) {
1371 return $this->eat8();
1372 }
1373 }
1374 $this->items = $this->appendNewInputItem($this->items, QR_MODE_AN, $run, str_split($this->dataStr));
1375 return $run;
1376 }
1377
1378 /**
1379 * eatKanji
1380 * @return int run
1381 */
1382 protected function eatKanji() {
1383 $p = 0;
1384 while($this->identifyMode($p) == QR_MODE_KJ) {
1385 $p += 2;
1386 }
1387 $this->items = $this->appendNewInputItem($this->items, QR_MODE_KJ, $p, str_split($this->dataStr));
1388 return $run;
1389 }
1390
1391 /**
1392 * eat8
1393 * @return int run
1394 */
1395 protected function eat8() {
1396 $la = $this->lengthIndicator(QR_MODE_AN, $this->version);
1397 $ln = $this->lengthIndicator(QR_MODE_NM, $this->version);
1398 $p = 1;
1399 $dataStrLen = strlen($this->dataStr);
1400 while($p < $dataStrLen) {
1401 $mode = $this->identifyMode($p);
1402 if ($mode == QR_MODE_KJ) {
1403 break;
1404 }
1405 if ($mode == QR_MODE_NM) {
1406 $q = $p;
1407 while($this->isdigitat($this->dataStr, $q)) {
1408 $q++;
1409 }
1410 $dif = $this->estimateBitsMode8($p) // + 4 + l8
1411 + $this->estimateBitsModeNum($q - $p) + 4 + $ln
1412 - $this->estimateBitsMode8($q); // - 4 - l8
1413 if ($dif < 0) {
1414 break;
1415 } else {
1416 $p = $q;
1417 }
1418 } elseif ($mode == QR_MODE_AN) {
1419 $q = $p;
1420 while($this->isalnumat($this->dataStr, $q)) {
1421 $q++;
1422 }
1423 $dif = $this->estimateBitsMode8($p) // + 4 + l8
1424 + $this->estimateBitsModeAn($q - $p) + 4 + $la
1425 - $this->estimateBitsMode8($q); // - 4 - l8
1426 if ($dif < 0) {
1427 break;
1428 } else {
1429 $p = $q;
1430 }
1431 } else {
1432 $p++;
1433 }
1434 }
1435 $run = $p;
1436 $this->items = $this->appendNewInputItem($this->items, QR_MODE_8B, $run, str_split($this->dataStr));
1437 return $run;
1438 }
1439
1440 /**
1441 * splitString
1442 */
1443 protected function splitString() {
1444 while (strlen($this->dataStr) > 0) {
1445 if ($this->dataStr == '') {
1446 return 0;
1447 }
1448 $mode = $this->identifyMode(0);
1449 switch ($mode) {
1450 case QR_MODE_NM: {
1451 $length = $this->eatNum();
1452 break;
1453 }
1454 case QR_MODE_AN: {
1455 $length = $this->eatAn();
1456 break;
1457 }
1458 case QR_MODE_KJ: {
1459 if ($hint == QR_MODE_KJ) {
1460 $length = $this->eatKanji();
1461 } else {
1462 $length = $this->eat8();
1463 }
1464 break;
1465 }
1466 default: {
1467 $length = $this->eat8();
1468 break;
1469 }
1470 }
1471 if ($length == 0) {
1472 return 0;
1473 }
1474 if ($length < 0) {
1475 return -1;
1476 }
1477 $this->dataStr = substr($this->dataStr, $length);
1478 }
1479 }
1480
1481 /**
1482 * toUpper
1483 */
1484 protected function toUpper() {
1485 $stringLen = strlen($this->dataStr);
1486 $p = 0;
1487 while ($p < $stringLen) {
1488 $mode = $this->identifyMode(substr($this->dataStr, $p), $this->hint);
1489 if ($mode == QR_MODE_KJ) {
1490 $p += 2;
1491 } else {
1492 if ((ord($this->dataStr[$p]) >= ord('a')) AND (ord($this->dataStr[$p]) <= ord('z'))) {
1493 $this->dataStr[$p] = chr(ord($this->dataStr[$p]) - 32);
1494 }
1495 $p++;
1496 }
1497 }
1498 return $this->dataStr;
1499 }
1500
1501 // - - - - - - - - - - - - - - - - - - - - - - - - -
1502
1503 // QRinputItem
1504
1505 /**
1506 * newInputItem
1507 * @param $mode (int)
1508 * @param $size (int)
1509 * @param $data (array)
1510 * @param $bstream (array)
1511 * @return array input item
1512 */
1513 protected function newInputItem($mode, $size, $data, $bstream=null) {
1514 $setData = array_slice($data, 0, $size);
1515 if (count($setData) < $size) {
1516 $setData = array_merge($setData, array_fill(0, ($size - count($setData)), 0));
1517 }
1518 if (!$this->check($mode, $size, $setData)) {
1519 return NULL;
1520 }
1521 $inputitem = array();
1522 $inputitem['mode'] = $mode;
1523 $inputitem['size'] = $size;
1524 $inputitem['data'] = $setData;
1525 $inputitem['bstream'] = $bstream;
1526 return $inputitem;
1527 }
1528
1529 /**
1530 * encodeModeNum
1531 * @param $inputitem (array)
1532 * @param $version (int)
1533 * @return array input item
1534 */
1535 protected function encodeModeNum($inputitem, $version) {
1536 $words = (int)($inputitem['size'] / 3);
1537 $inputitem['bstream'] = array();
1538 $val = 0x1;
1539 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, $val);
1540 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], $this->lengthIndicator(QR_MODE_NM, $version), $inputitem['size']);
1541 for ($i=0; $i < $words; ++$i) {
1542 $val = (ord($inputitem['data'][$i*3 ]) - ord('0')) * 100;
1543 $val += (ord($inputitem['data'][$i*3+1]) - ord('0')) * 10;
1544 $val += (ord($inputitem['data'][$i*3+2]) - ord('0'));
1545 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 10, $val);
1546 }
1547 if ($inputitem['size'] - $words * 3 == 1) {
1548 $val = ord($inputitem['data'][$words*3]) - ord('0');
1549 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, $val);
1550 } elseif (($inputitem['size'] - ($words * 3)) == 2) {
1551 $val = (ord($inputitem['data'][$words*3 ]) - ord('0')) * 10;
1552 $val += (ord($inputitem['data'][$words*3+1]) - ord('0'));
1553 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 7, $val);
1554 }
1555 return $inputitem;
1556 }
1557
1558 /**
1559 * encodeModeAn
1560 * @param $inputitem (array)
1561 * @param $version (int)
1562 * @return array input item
1563 */
1564 protected function encodeModeAn($inputitem, $version) {
1565 $words = (int)($inputitem['size'] / 2);
1566 $inputitem['bstream'] = array();
1567 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, 0x02);
1568 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], $this->lengthIndicator(QR_MODE_AN, $version), $inputitem['size']);
1569 for ($i=0; $i < $words; ++$i) {
1570 $val = (int)($this->lookAnTable(ord($inputitem['data'][$i*2])) * 45);
1571 $val += (int)($this->lookAnTable(ord($inputitem['data'][($i*2)+1])));
1572 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 11, $val);
1573 }
1574 if ($inputitem['size'] & 1) {
1575 $val = $this->lookAnTable(ord($inputitem['data'][($words * 2)]));
1576 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 6, $val);
1577 }
1578 return $inputitem;
1579 }
1580
1581 /**
1582 * encodeMode8
1583 * @param $inputitem (array)
1584 * @param $version (int)
1585 * @return array input item
1586 */
1587 protected function encodeMode8($inputitem, $version) {
1588 $inputitem['bstream'] = array();
1589 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, 0x4);
1590 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], $this->lengthIndicator(QR_MODE_8B, $version), $inputitem['size']);
1591 for ($i=0; $i < $inputitem['size']; ++$i) {
1592 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 8, ord($inputitem['data'][$i]));
1593 }
1594 return $inputitem;
1595 }
1596
1597 /**
1598 * encodeModeKanji
1599 * @param $inputitem (array)
1600 * @param $version (int)
1601 * @return array input item
1602 */
1603 protected function encodeModeKanji($inputitem, $version) {
1604 $inputitem['bstream'] = array();
1605 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, 0x8);
1606 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], $this->lengthIndicator(QR_MODE_KJ, $version), (int)($inputitem['size'] / 2));
1607 for ($i=0; $i<$inputitem['size']; $i+=2) {
1608 $val = (ord($inputitem['data'][$i]) << 8) | ord($inputitem['data'][$i+1]);
1609 if ($val <= 0x9ffc) {
1610 $val -= 0x8140;
1611 } else {
1612 $val -= 0xc140;
1613 }
1614 $h = ($val >> 8) * 0xc0;
1615 $val = ($val & 0xff) + $h;
1616 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 13, $val);
1617 }
1618 return $inputitem;
1619 }
1620
1621 /**
1622 * encodeModeStructure
1623 * @param $inputitem (array)
1624 * @return array input item
1625 */
1626 protected function encodeModeStructure($inputitem) {
1627 $inputitem['bstream'] = array();
1628 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, 0x03);
1629 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, ord($inputitem['data'][1]) - 1);
1630 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, ord($inputitem['data'][0]) - 1);
1631 $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 8, ord($inputitem['data'][2]));
1632 return $inputitem;
1633 }
1634
1635 /**
1636 * encodeBitStream
1637 * @param $inputitem (array)
1638 * @param $version (int)
1639 * @return array input item
1640 */
1641 protected function encodeBitStream($inputitem, $version) {
1642 $inputitem['bstream'] = array();
1643 $words = $this->maximumWords($inputitem['mode'], $version);
1644 if ($inputitem['size'] > $words) {
1645 $st1 = $this->newInputItem($inputitem['mode'], $words, $inputitem['data']);
1646 $st2 = $this->newInputItem($inputitem['mode'], $inputitem['size'] - $words, array_slice($inputitem['data'], $words));
1647 $st1 = $this->encodeBitStream($st1, $version);
1648 $st2 = $this->encodeBitStream($st2, $version);
1649 $inputitem['bstream'] = array();
1650 $inputitem['bstream'] = $this->appendBitstream($inputitem['bstream'], $st1['bstream']);
1651 $inputitem['bstream'] = $this->appendBitstream($inputitem['bstream'], $st2['bstream']);
1652 } else {
1653 switch($inputitem['mode']) {
1654 case QR_MODE_NM: {
1655 $inputitem = $this->encodeModeNum($inputitem, $version);
1656 break;
1657 }
1658 case QR_MODE_AN: {
1659 $inputitem = $this->encodeModeAn($inputitem, $version);
1660 break;
1661 }
1662 case QR_MODE_8B: {
1663 $inputitem = $this->encodeMode8($inputitem, $version);
1664 break;
1665 }
1666 case QR_MODE_KJ: {
1667 $inputitem = $this->encodeModeKanji($inputitem, $version);
1668 break;
1669 }
1670 case QR_MODE_ST: {
1671 $inputitem = $this->encodeModeStructure($inputitem);
1672 break;
1673 }
1674 default: {
1675 break;
1676 }
1677 }
1678 }
1679 return $inputitem;
1680 }
1681
1682 // - - - - - - - - - - - - - - - - - - - - - - - - -
1683
1684 // QRinput
1685
1686 /**
1687 * Append data to an input object.
1688 * The data is copied and appended to the input object.
1689 * @param $items (arrray) input items
1690 * @param $mode (int) encoding mode.
1691 * @param $size (int) size of data (byte).
1692 * @param $data (array) array of input data.
1693 * @return items
1694 *
1695 */
1696 protected function appendNewInputItem($items, $mode, $size, $data) {
1697 $newitem = $this->newInputItem($mode, $size, $data);
1698 if (!empty($newitem)) {
1699 $items[] = $newitem;
1700 }
1701 return $items;
1702 }
1703
1704 /**
1705 * insertStructuredAppendHeader
1706 * @param $items (array)
1707 * @param $size (int)
1708 * @param $index (int)
1709 * @param $parity (int)
1710 * @return array items
1711 */
1712 protected function insertStructuredAppendHeader($items, $size, $index, $parity) {
1713 if ($size > MAX_STRUCTURED_SYMBOLS) {
1714 return -1;
1715 }
1716 if (($index <= 0) OR ($index > MAX_STRUCTURED_SYMBOLS)) {
1717 return -1;
1718 }
1719 $buf = array($size, $index, $parity);
1720 $entry = $this->newInputItem(QR_MODE_ST, 3, buf);
1721 array_unshift($items, $entry);
1722 return $items;
1723 }
1724
1725 /**
1726 * calcParity
1727 * @param $items (array)
1728 * @return int parity
1729 */
1730 protected function calcParity($items) {
1731 $parity = 0;
1732 foreach ($items as $item) {
1733 if ($item['mode'] != QR_MODE_ST) {
1734 for ($i=$item['size']-1; $i>=0; --$i) {
1735 $parity ^= $item['data'][$i];
1736 }
1737 }
1738 }
1739 return $parity;
1740 }
1741
1742 /**
1743 * checkModeNum
1744 * @param $size (int)
1745 * @param $data (array)
1746 * @return boolean true or false
1747 */
1748 protected function checkModeNum($size, $data) {
1749 for ($i=0; $i<$size; ++$i) {
1750 if ((ord($data[$i]) < ord('0')) OR (ord($data[$i]) > ord('9'))){
1751 return false;
1752 }
1753 }
1754 return true;
1755 }
1756
1757 /**
1758 * Look up the alphabet-numeric convesion table (see JIS X0510:2004, pp.19).
1759 * @param $c (int) character value
1760 * @return value
1761 */
1762 protected function lookAnTable($c) {
1763 return (($c > 127)?-1:$this->anTable[$c]);
1764 }
1765
1766 /**
1767 * checkModeAn
1768 * @param $size (int)
1769 * @param $data (array)
1770 * @return boolean true or false
1771 */
1772 protected function checkModeAn($size, $data) {
1773 for ($i=0; $i<$size; ++$i) {
1774 if ($this->lookAnTable(ord($data[$i])) == -1) {
1775 return false;
1776 }
1777 }
1778 return true;
1779 }
1780
1781 /**
1782 * estimateBitsModeNum
1783 * @param $size (int)
1784 * @return int number of bits
1785 */
1786 protected function estimateBitsModeNum($size) {
1787 $w = (int)($size / 3);
1788 $bits = ($w * 10);
1789 switch($size - ($w * 3)) {
1790 case 1: {
1791 $bits += 4;
1792 break;
1793 }
1794 case 2: {
1795 $bits += 7;
1796 break;
1797 }
1798 }
1799 return $bits;
1800 }
1801
1802 /**
1803 * estimateBitsModeAn
1804 * @param $size (int)
1805 * @return int number of bits
1806 */
1807 protected function estimateBitsModeAn($size) {
1808 $bits = (int)($size * 5.5); // (size / 2 ) * 11
1809 if ($size & 1) {
1810 $bits += 6;
1811 }
1812 return $bits;
1813 }
1814
1815 /**
1816 * estimateBitsMode8
1817 * @param $size (int)
1818 * @return int number of bits
1819 */
1820 protected function estimateBitsMode8($size) {
1821 return (int)($size * 8);
1822 }
1823
1824 /**
1825 * estimateBitsModeKanji
1826 * @param $size (int)
1827 * @return int number of bits
1828 */
1829 protected function estimateBitsModeKanji($size) {
1830 return (int)($size * 6.5); // (size / 2 ) * 13
1831 }
1832
1833 /**
1834 * checkModeKanji
1835 * @param $size (int)
1836 * @param $data (array)
1837 * @return boolean true or false
1838 */
1839 protected function checkModeKanji($size, $data) {
1840 if ($size & 1) {
1841 return false;
1842 }
1843 for ($i=0; $i<$size; $i+=2) {
1844 $val = (ord($data[$i]) << 8) | ord($data[$i+1]);
1845 if (($val < 0x8140) OR (($val > 0x9ffc) AND ($val < 0xe040)) OR ($val > 0xebbf)) {
1846 return false;
1847 }
1848 }
1849 return true;
1850 }
1851
1852 /**
1853 * Validate the input data.
1854 * @param $mode (int) encoding mode.
1855 * @param $size (int) size of data (byte).
1856 * @param $data (array) data to validate
1857 * @return boolean true in case of valid data, false otherwise
1858 */
1859 protected function check($mode, $size, $data) {
1860 if ($size <= 0) {
1861 return false;
1862 }
1863 switch($mode) {
1864 case QR_MODE_NM: {
1865 return $this->checkModeNum($size, $data);
1866 }
1867 case QR_MODE_AN: {
1868 return $this->checkModeAn($size, $data);
1869 }
1870 case QR_MODE_KJ: {
1871 return $this->checkModeKanji($size, $data);
1872 }
1873 case QR_MODE_8B: {
1874 return true;
1875 }
1876 case QR_MODE_ST: {
1877 return true;
1878 }
1879 default: {
1880 break;
1881 }
1882 }
1883 return false;
1884 }
1885
1886 /**
1887 * estimateBitStreamSize
1888 * @param $items (array)
1889 * @param $version (int)
1890 * @return int bits
1891 */
1892 protected function estimateBitStreamSize($items, $version) {
1893 $bits = 0;
1894 if ($version == 0) {
1895 $version = 1;
1896 }
1897 foreach ($items as $item) {
1898 switch($item['mode']) {
1899 case QR_MODE_NM: {
1900 $bits = $this->estimateBitsModeNum($item['size']);
1901 break;
1902 }
1903 case QR_MODE_AN: {
1904 $bits = $this->estimateBitsModeAn($item['size']);
1905 break;
1906 }
1907 case QR_MODE_8B: {
1908 $bits = $this->estimateBitsMode8($item['size']);
1909 break;
1910 }
1911 case QR_MODE_KJ: {
1912 $bits = $this->estimateBitsModeKanji($item['size']);
1913 break;
1914 }
1915 case QR_MODE_ST: {
1916 return STRUCTURE_HEADER_BITS;
1917 }
1918 default: {
1919 return 0;
1920 }
1921 }
1922 $l = $this->lengthIndicator($item['mode'], $version);
1923 $m = 1 << $l;
1924 $num = (int)(($item['size'] + $m - 1) / $m);
1925 $bits += $num * (4 + $l);
1926 }
1927 return $bits;
1928 }
1929
1930 /**
1931 * estimateVersion
1932 * @param $items (array)
1933 * @return int version
1934 */
1935 protected function estimateVersion($items) {
1936 $version = 0;
1937 $prev = 0;
1938 do {
1939 $prev = $version;
1940 $bits = $this->estimateBitStreamSize($items, $prev);
1941 $version = $this->getMinimumVersion((int)(($bits + 7) / 8), $this->level);
1942 if ($version < 0) {
1943 return -1;
1944 }
1945 } while ($version > $prev);
1946 return $version;
1947 }
1948
1949 /**
1950 * lengthOfCode
1951 * @param $mode (int)
1952 * @param $version (int)
1953 * @param $bits (int)
1954 * @return int size
1955 */
1956 protected function lengthOfCode($mode, $version, $bits) {
1957 $payload = $bits - 4 - $this->lengthIndicator($mode, $version);
1958 switch($mode) {
1959 case QR_MODE_NM: {
1960 $chunks = (int)($payload / 10);
1961 $remain = $payload - $chunks * 10;
1962 $size = $chunks * 3;
1963 if ($remain >= 7) {
1964 $size += 2;
1965 } elseif ($remain >= 4) {
1966 $size += 1;
1967 }
1968 break;
1969 }
1970 case QR_MODE_AN: {
1971 $chunks = (int)($payload / 11);
1972 $remain = $payload - $chunks * 11;
1973 $size = $chunks * 2;
1974 if ($remain >= 6) {
1975 ++$size;
1976 }
1977 break;
1978 }
1979 case QR_MODE_8B: {
1980 $size = (int)($payload / 8);
1981 break;
1982 }
1983 case QR_MODE_KJ: {
1984 $size = (int)(($payload / 13) * 2);
1985 break;
1986 }
1987 case QR_MODE_ST: {
1988 $size = (int)($payload / 8);
1989 break;
1990 }
1991 default: {
1992 $size = 0;
1993 break;
1994 }
1995 }
1996 $maxsize = $this->maximumWords($mode, $version);
1997 if ($size < 0) {
1998 $size = 0;
1999 }
2000 if ($size > $maxsize) {
2001 $size = $maxsize;
2002 }
2003 return $size;
2004 }
2005
2006 /**
2007 * createBitStream
2008 * @param $items (array)
2009 * @return array of items and total bits
2010 */
2011 protected function createBitStream($items) {
2012 $total = 0;
2013 foreach ($items as $key => $item) {
2014 $items[$key] = $this->encodeBitStream($item, $this->version);
2015 $bits = count($items[$key]['bstream']);
2016 $total += $bits;
2017 }
2018 return array($items, $total);
2019 }
2020
2021 /**
2022 * convertData
2023 * @param $items (array)
2024 * @return array items
2025 */
2026 protected function convertData($items) {
2027 $ver = $this->estimateVersion($items);
2028 if ($ver > $this->version) {
2029 $this->version = $ver;
2030 }
2031 for (;;) {
2032 $cbs = $this->createBitStream($items);
2033 $items = $cbs[0];
2034 $bits = $cbs[1];
2035 if ($bits < 0) {
2036 return -1;
2037 }
2038 $ver = $this->getMinimumVersion((int)(($bits + 7) / 8), $this->level);
2039 if ($ver < 0) {
2040 return -1;
2041 } elseif ($ver > $this->version) {
2042 $this->version = $ver;
2043 } else {
2044 break;
2045 }
2046 }
2047 return $items;
2048 }
2049
2050 /**
2051 * Append Padding Bit to bitstream
2052 * @param $bstream (array)
2053 * @return array bitstream
2054 */
2055 protected function appendPaddingBit($bstream) {
2056 if (is_null($bstream)) {
2057 return null;
2058 }
2059 $bits = count($bstream);
2060 $maxwords = $this->getDataLength($this->version, $this->level);
2061 $maxbits = $maxwords * 8;
2062 if ($maxbits == $bits) {
2063 return $bstream;
2064 }
2065 if ($maxbits - $bits < 5) {
2066 return $this->appendNum($bstream, $maxbits - $bits, 0);
2067 }
2068 $bits += 4;
2069 $words = (int)(($bits + 7) / 8);
2070 $padding = array();
2071 $padding = $this->appendNum($padding, $words * 8 - $bits + 4, 0);
2072 $padlen = $maxwords - $words;
2073 if ($padlen > 0) {
2074 $padbuf = array();
2075 for ($i=0; $i<$padlen; ++$i) {
2076 $padbuf[$i] = ($i&1)?0x11:0xec;
2077 }
2078 $padding = $this->appendBytes($padding, $padlen, $padbuf);
2079 }
2080 return $this->appendBitstream($bstream, $padding);
2081 }
2082
2083 /**
2084 * mergeBitStream
2085 * @param $items (array) items
2086 * @return array bitstream
2087 */
2088 protected function mergeBitStream($items) {
2089 $items = $this->convertData($items);
2090 if (!is_array($items)) {
2091 return null;
2092 }
2093 $bstream = array();
2094 foreach ($items as $item) {
2095 $bstream = $this->appendBitstream($bstream, $item['bstream']);
2096 }
2097 return $bstream;
2098 }
2099
2100 /**
2101 * Returns a stream of bits.
2102 * @param $items (int)
2103 * @return array padded merged byte stream
2104 */
2105 protected function getBitStream($items) {
2106 $bstream = $this->mergeBitStream($items);
2107 return $this->appendPaddingBit($bstream);
2108 }
2109
2110 /**
2111 * Pack all bit streams padding bits into a byte array.
2112 * @param $items (int)
2113 * @return array padded merged byte stream
2114 */
2115 protected function getByteStream($items) {
2116 $bstream = $this->getBitStream($items);
2117 return $this->bitstreamToByte($bstream);
2118 }
2119
2120 // - - - - - - - - - - - - - - - - - - - - - - - - -
2121
2122 // QRbitstream
2123
2124 /**
2125 * Return an array with zeros
2126 * @param $setLength (int) array size
2127 * @return array
2128 */
2129 protected function allocate($setLength) {
2130 return array_fill(0, $setLength, 0);
2131 }
2132
2133 /**
2134 * Return new bitstream from number
2135 * @param $bits (int) number of bits
2136 * @param $num (int) number
2137 * @return array bitstream
2138 */
2139 protected function newFromNum($bits, $num) {
2140 $bstream = $this->allocate($bits);
2141 $mask = 1 << ($bits - 1);
2142 for ($i=0; $i<$bits; ++$i) {
2143 if ($num & $mask) {
2144 $bstream[$i] = 1;
2145 } else {
2146 $bstream[$i] = 0;
2147 }
2148 $mask = $mask >> 1;
2149 }
2150 return $bstream;
2151 }
2152
2153 /**
2154 * Return new bitstream from bytes
2155 * @param $size (int) size
2156 * @param $data (array) bytes
2157 * @return array bitstream
2158 */
2159 protected function newFromBytes($size, $data) {
2160 $bstream = $this->allocate($size * 8);
2161 $p=0;
2162 for ($i=0; $i<$size; ++$i) {
2163 $mask = 0x80;
2164 for ($j=0; $j<8; ++$j) {
2165 if ($data[$i] & $mask) {
2166 $bstream[$p] = 1;
2167 } else {
2168 $bstream[$p] = 0;
2169 }
2170 $p++;
2171 $mask = $mask >> 1;
2172 }
2173 }
2174 return $bstream;
2175 }
2176
2177 /**
2178 * Append one bitstream to another
2179 * @param $bitstream (array) original bitstream
2180 * @param $append (array) bitstream to append
2181 * @return array bitstream
2182 */
2183 protected function appendBitstream($bitstream, $append) {
2184 if ((!is_array($append)) OR (count($append) == 0)) {
2185 return $bitstream;
2186 }
2187 if (count($bitstream) == 0) {
2188 return $append;
2189 }
2190 return array_values(array_merge($bitstream, $append));
2191 }
2192
2193 /**
2194 * Append one bitstream created from number to another
2195 * @param $bitstream (array) original bitstream
2196 * @param $bits (int) number of bits
2197 * @param $num (int) number
2198 * @return array bitstream
2199 */
2200 protected function appendNum($bitstream, $bits, $num) {
2201 if ($bits == 0) {
2202 return 0;
2203 }
2204 $b = $this->newFromNum($bits, $num);
2205 return $this->appendBitstream($bitstream, $b);
2206 }
2207
2208 /**
2209 * Append one bitstream created from bytes to another
2210 * @param $bitstream (array) original bitstream
2211 * @param $size (int) size
2212 * @param $data (array) bytes
2213 * @return array bitstream
2214 */
2215 protected function appendBytes($bitstream, $size, $data) {
2216 if ($size == 0) {
2217 return 0;
2218 }
2219 $b = $this->newFromBytes($size, $data);
2220 return $this->appendBitstream($bitstream, $b);
2221 }
2222
2223 /**
2224 * Convert bitstream to bytes
2225 * @param $bstream (array) original bitstream
2226 * @return array of bytes
2227 */
2228 protected function bitstreamToByte($bstream) {
2229 if (is_null($bstream)) {
2230 return null;
2231 }
2232 $size = count($bstream);
2233 if ($size == 0) {
2234 return array();
2235 }
2236 $data = array_fill(0, (int)(($size + 7) / 8), 0);
2237 $bytes = (int)($size / 8);
2238 $p = 0;
2239 for ($i=0; $i<$bytes; $i++) {
2240 $v = 0;
2241 for ($j=0; $j<8; $j++) {
2242 $v = $v << 1;
2243 $v |= $bstream[$p];
2244 $p++;
2245 }
2246 $data[$i] = $v;
2247 }
2248 if ($size & 7) {
2249 $v = 0;
2250 for ($j=0; $j<($size & 7); $j++) {
2251 $v = $v << 1;
2252 $v |= $bstream[$p];
2253 $p++;
2254 }
2255 $data[$bytes] = $v;
2256 }
2257 return $data;
2258 }
2259
2260 // - - - - - - - - - - - - - - - - - - - - - - - - -
2261
2262 // QRspec
2263
2264 /**
2265 * Replace a value on the array at the specified position
2266 * @param $srctab (array)
2267 * @param $x (int) X position
2268 * @param $y (int) Y position
2269 * @param $repl (string) value to replace
2270 * @param $replLen (int) length of the repl string
2271 * @return array srctab
2272 */
2273 protected function qrstrset($srctab, $x, $y, $repl, $replLen=false) {
2274 $srctab[$y] = substr_replace($srctab[$y], ($replLen !== false)?substr($repl,0,$replLen):$repl, $x, ($replLen !== false)?$replLen:strlen($repl));
2275 return $srctab;
2276 }
2277
2278 /**
2279 * Return maximum data code length (bytes) for the version.
2280 * @param $version (int) version
2281 * @param $level (int) error correction level
2282 * @return int maximum size (bytes)
2283 */
2284 protected function getDataLength($version, $level) {
2285 return $this->capacity[$version][QRCAP_WORDS] - $this->capacity[$version][QRCAP_EC][$level];
2286 }
2287
2288 /**
2289 * Return maximum error correction code length (bytes) for the version.
2290 * @param $version (int) version
2291 * @param $level (int) error correction level
2292 * @return int ECC size (bytes)
2293 */
2294 protected function getECCLength($version, $level){
2295 return $this->capacity[$version][QRCAP_EC][$level];
2296 }
2297
2298 /**
2299 * Return the width of the symbol for the version.
2300 * @param $version (int) version
2301 * @return int width
2302 */
2303 protected function getWidth($version) {
2304 return $this->capacity[$version][QRCAP_WIDTH];
2305 }
2306
2307 /**
2308 * Return the numer of remainder bits.
2309 * @param $version (int) version
2310 * @return int number of remainder bits
2311 */
2312 protected function getRemainder($version) {
2313 return $this->capacity[$version][QRCAP_REMINDER];
2314 }
2315
2316 /**
2317 * Return a version number that satisfies the input code length.
2318 * @param $size (int) input code length (byte)
2319 * @param $level (int) error correction level
2320 * @return int version number
2321 */
2322 protected function getMinimumVersion($size, $level) {
2323 for ($i=1; $i <= QRSPEC_VERSION_MAX; ++$i) {
2324 $words = $this->capacity[$i][QRCAP_WORDS] - $this->capacity[$i][QRCAP_EC][$level];
2325 if ($words >= $size) {
2326 return $i;
2327 }
2328 }
2329 return -1;
2330 }
2331
2332 /**
2333 * Return the size of length indicator for the mode and version.
2334 * @param $mode (int) encoding mode
2335 * @param $version (int) version
2336 * @return int the size of the appropriate length indicator (bits).
2337 */
2338 protected function lengthIndicator($mode, $version) {
2339 if ($mode == QR_MODE_ST) {
2340 return 0;
2341 }
2342 if ($version <= 9) {
2343 $l = 0;
2344 } elseif ($version <= 26) {
2345 $l = 1;
2346 } else {
2347 $l = 2;
2348 }
2349 return $this->lengthTableBits[$mode][$l];
2350 }
2351
2352 /**
2353 * Return the maximum length for the mode and version.
2354 * @param $mode (int) encoding mode
2355 * @param $version (int) version
2356 * @return int the maximum length (bytes)
2357 */
2358 protected function maximumWords($mode, $version) {
2359 if ($mode == QR_MODE_ST) {
2360 return 3;
2361 }
2362 if ($version <= 9) {
2363 $l = 0;
2364 } else if ($version <= 26) {
2365 $l = 1;
2366 } else {
2367 $l = 2;
2368 }
2369 $bits = $this->lengthTableBits[$mode][$l];
2370 $words = (1 << $bits) - 1;
2371 if ($mode == QR_MODE_KJ) {
2372 $words *= 2; // the number of bytes is required
2373 }
2374 return $words;
2375 }
2376
2377 /**
2378 * Return an array of ECC specification.
2379 * @param $version (int) version
2380 * @param $level (int) error correction level
2381 * @param $spec (array) an array of ECC specification contains as following: {# of type1 blocks, # of data code, # of ecc code, # of type2 blocks, # of data code}
2382 * @return array spec
2383 */
2384 protected function getEccSpec($version, $level, $spec) {
2385 if (count($spec) < 5) {
2386 $spec = array(0, 0, 0, 0, 0);
2387 }
2388 $b1 = $this->eccTable[$version][$level][0];
2389 $b2 = $this->eccTable[$version][$level][1];
2390 $data = $this->getDataLength($version, $level);
2391 $ecc = $this->getECCLength($version, $level);
2392 if ($b2 == 0) {
2393 $spec[0] = $b1;
2394 $spec[1] = (int)($data / $b1);
2395 $spec[2] = (int)($ecc / $b1);
2396 $spec[3] = 0;
2397 $spec[4] = 0;
2398 } else {
2399 $spec[0] = $b1;
2400 $spec[1] = (int)($data / ($b1 + $b2));
2401 $spec[2] = (int)($ecc / ($b1 + $b2));
2402 $spec[3] = $b2;
2403 $spec[4] = $spec[1] + 1;
2404 }
2405 return $spec;
2406 }
2407
2408 /**
2409 * Put an alignment marker.
2410 * @param $frame (array) frame
2411 * @param $ox (int) X center coordinate of the pattern
2412 * @param $oy (int) Y center coordinate of the pattern
2413 * @return array frame
2414 */
2415 protected function putAlignmentMarker($frame, $ox, $oy) {
2416 $finder = array(
2417 "\xa1\xa1\xa1\xa1\xa1",
2418 "\xa1\xa0\xa0\xa0\xa1",
2419 "\xa1\xa0\xa1\xa0\xa1",
2420 "\xa1\xa0\xa0\xa0\xa1",
2421 "\xa1\xa1\xa1\xa1\xa1"
2422 );
2423 $yStart = $oy - 2;
2424 $xStart = $ox - 2;
2425 for ($y=0; $y < 5; $y++) {
2426 $frame = $this->qrstrset($frame, $xStart, $yStart+$y, $finder[$y]);
2427 }
2428 return $frame;
2429 }
2430
2431 /**
2432 * Put an alignment pattern.
2433 * @param $version (int) version
2434 * @param $frame (array) frame
2435 * @param $width (int) width
2436 * @return array frame
2437 */
2438 protected function putAlignmentPattern($version, $frame, $width) {
2439 if ($version < 2) {
2440 return $frame;
2441 }
2442 $d = $this->alignmentPattern[$version][1] - $this->alignmentPattern[$version][0];
2443 if ($d < 0) {
2444 $w = 2;
2445 } else {
2446 $w = (int)(($width - $this->alignmentPattern[$version][0]) / $d + 2);
2447 }
2448 if ($w * $w - 3 == 1) {
2449 $x = $this->alignmentPattern[$version][0];
2450 $y = $this->alignmentPattern[$version][0];
2451 $frame = $this->putAlignmentMarker($frame, $x, $y);
2452 return $frame;
2453 }
2454 $cx = $this->alignmentPattern[$version][0];
2455 $wo = $w - 1;
2456 for ($x=1; $x < $wo; ++$x) {
2457 $frame = $this->putAlignmentMarker($frame, 6, $cx);
2458 $frame = $this->putAlignmentMarker($frame, $cx, 6);
2459 $cx += $d;
2460 }
2461 $cy = $this->alignmentPattern[$version][0];
2462 for ($y=0; $y < $wo; ++$y) {
2463 $cx = $this->alignmentPattern[$version][0];
2464 for ($x=0; $x < $wo; ++$x) {
2465 $frame = $this->putAlignmentMarker($frame, $cx, $cy);
2466 $cx += $d;
2467 }
2468 $cy += $d;
2469 }
2470 return $frame;
2471 }
2472
2473 /**
2474 * Return BCH encoded version information pattern that is used for the symbol of version 7 or greater. Use lower 18 bits.
2475 * @param $version (int) version
2476 * @return BCH encoded version information pattern
2477 */
2478 protected function getVersionPattern($version) {
2479 if (($version < 7) OR ($version > QRSPEC_VERSION_MAX)) {
2480 return 0;
2481 }
2482 return $this->versionPattern[($version - 7)];
2483 }
2484
2485 /**
2486 * Return BCH encoded format information pattern.
2487 * @param $mask (array)
2488 * @param $level (int) error correction level
2489 * @return BCH encoded format information pattern
2490 */
2491 protected function getFormatInfo($mask, $level) {
2492 if (($mask < 0) OR ($mask > 7)) {
2493 return 0;
2494 }
2495 if (($level < 0) OR ($level > 3)) {
2496 return 0;
2497 }
2498 return $this->formatInfo[$level][$mask];
2499 }
2500
2501 /**
2502 * Put a finder pattern.
2503 * @param $frame (array) frame
2504 * @param $ox (int) X center coordinate of the pattern
2505 * @param $oy (int) Y center coordinate of the pattern
2506 * @return array frame
2507 */
2508 protected function putFinderPattern($frame, $ox, $oy) {
2509 $finder = array(
2510 "\xc1\xc1\xc1\xc1\xc1\xc1\xc1",
2511 "\xc1\xc0\xc0\xc0\xc0\xc0\xc1",
2512 "\xc1\xc0\xc1\xc1\xc1\xc0\xc1",
2513 "\xc1\xc0\xc1\xc1\xc1\xc0\xc1",
2514 "\xc1\xc0\xc1\xc1\xc1\xc0\xc1",
2515 "\xc1\xc0\xc0\xc0\xc0\xc0\xc1",
2516 "\xc1\xc1\xc1\xc1\xc1\xc1\xc1"
2517 );
2518 for ($y=0; $y < 7; $y++) {
2519 $frame = $this->qrstrset($frame, $ox, ($oy + $y), $finder[$y]);
2520 }
2521 return $frame;
2522 }
2523
2524 /**
2525 * Return a copy of initialized frame.
2526 * @param $version (int) version
2527 * @return Array of unsigned char.
2528 */
2529 protected function createFrame($version) {
2530 $width = $this->capacity[$version][QRCAP_WIDTH];
2531 $frameLine = str_repeat ("\0", $width);
2532 $frame = array_fill(0, $width, $frameLine);
2533 // Finder pattern
2534 $frame = $this->putFinderPattern($frame, 0, 0);
2535 $frame = $this->putFinderPattern($frame, $width - 7, 0);
2536 $frame = $this->putFinderPattern($frame, 0, $width - 7);
2537 // Separator
2538 $yOffset = $width - 7;
2539 for ($y=0; $y < 7; ++$y) {
2540 $frame[$y][7] = "\xc0";
2541 $frame[$y][$width - 8] = "\xc0";
2542 $frame[$yOffset][7] = "\xc0";
2543 ++$yOffset;
2544 }
2545 $setPattern = str_repeat("\xc0", 8);
2546 $frame = $this->qrstrset($frame, 0, 7, $setPattern);
2547 $frame = $this->qrstrset($frame, $width-8, 7, $setPattern);
2548 $frame = $this->qrstrset($frame, 0, $width - 8, $setPattern);
2549 // Format info
2550 $setPattern = str_repeat("\x84", 9);
2551 $frame = $this->qrstrset($frame, 0, 8, $setPattern);
2552 $frame = $this->qrstrset($frame, $width - 8, 8, $setPattern, 8);
2553 $yOffset = $width - 8;
2554 for ($y=0; $y < 8; ++$y,++$yOffset) {
2555 $frame[$y][8] = "\x84";
2556 $frame[$yOffset][8] = "\x84";
2557 }
2558 // Timing pattern
2559 $wo = $width - 15;
2560 for ($i=1; $i < $wo; ++$i) {
2561 $frame[6][7+$i] = chr(0x90 | ($i & 1));
2562 $frame[7+$i][6] = chr(0x90 | ($i & 1));
2563 }
2564 // Alignment pattern
2565 $frame = $this->putAlignmentPattern($version, $frame, $width);
2566 // Version information
2567 if ($version >= 7) {
2568 $vinf = $this->getVersionPattern($version);
2569 $v = $vinf;
2570 for ($x=0; $x<6; ++$x) {
2571 for ($y=0; $y<3; ++$y) {
2572 $frame[($width - 11)+$y][$x] = chr(0x88 | ($v & 1));
2573 $v = $v >> 1;
2574 }
2575 }
2576 $v = $vinf;
2577 for ($y=0; $y<6; ++$y) {
2578 for ($x=0; $x<3; ++$x) {
2579 $frame[$y][$x+($width - 11)] = chr(0x88 | ($v & 1));
2580 $v = $v >> 1;
2581 }
2582 }
2583 }
2584 // and a little bit...
2585 $frame[$width - 8][8] = "\x81";
2586 return $frame;
2587 }
2588
2589 /**
2590 * Set new frame for the specified version.
2591 * @param $version (int) version
2592 * @return Array of unsigned char.
2593 */
2594 protected function newFrame($version) {
2595 if (($version < 1) OR ($version > QRSPEC_VERSION_MAX)) {
2596 return NULL;
2597 }
2598 if (!isset($this->frames[$version])) {
2599 $this->frames[$version] = $this->createFrame($version);
2600 }
2601 if (is_null($this->frames[$version])) {
2602 return NULL;
2603 }
2604 return $this->frames[$version];
2605 }
2606
2607 /**
2608 * Return block number 0
2609 * @param $spec (array)
2610 * @return int value
2611 */
2612 protected function rsBlockNum($spec) {
2613 return ($spec[0] + $spec[3]);
2614 }
2615
2616 /**
2617 * Return block number 1
2618 * @param $spec (array)
2619 * @return int value
2620 */
2621 protected function rsBlockNum1($spec) {
2622 return $spec[0];
2623 }
2624
2625 /**
2626 * Return data codes 1
2627 * @param $spec (array)
2628 * @return int value
2629 */
2630 protected function rsDataCodes1($spec) {
2631 return $spec[1];
2632 }
2633
2634 /**
2635 * Return ecc codes 1
2636 * @param $spec (array)
2637 * @return int value
2638 */
2639 protected function rsEccCodes1($spec) {
2640 return $spec[2];
2641 }
2642
2643 /**
2644 * Return block number 2
2645 * @param $spec (array)
2646 * @return int value
2647 */
2648 protected function rsBlockNum2($spec) {
2649 return $spec[3];
2650 }
2651
2652 /**
2653 * Return data codes 2
2654 * @param $spec (array)
2655 * @return int value
2656 */
2657 protected function rsDataCodes2($spec) {
2658 return $spec[4];
2659 }
2660
2661 /**
2662 * Return ecc codes 2
2663 * @param $spec (array)
2664 * @return int value
2665 */
2666 protected function rsEccCodes2($spec) {
2667 return $spec[2];
2668 }
2669
2670 /**
2671 * Return data length
2672 * @param $spec (array)
2673 * @return int value
2674 */
2675 protected function rsDataLength($spec) {
2676 return ($spec[0] * $spec[1]) + ($spec[3] * $spec[4]);
2677 }
2678
2679 /**
2680 * Return ecc length
2681 * @param $spec (array)
2682 * @return int value
2683 */
2684 protected function rsEccLength($spec) {
2685 return ($spec[0] + $spec[3]) * $spec[2];
2686 }
2687
2688 // - - - - - - - - - - - - - - - - - - - - - - - - -
2689
2690 // QRrs
2691
2692 /**
2693 * Initialize a Reed-Solomon codec and add it to existing rsitems
2694 * @param $symsize (int) symbol size, bits
2695 * @param $gfpoly (int) Field generator polynomial coefficients
2696 * @param $fcr (int) first root of RS code generator polynomial, index form
2697 * @param $prim (int) primitive element to generate polynomial roots
2698 * @param $nroots (int) RS code generator polynomial degree (number of roots)
2699 * @param $pad (int) padding bytes at front of shortened block
2700 * @return array Array of RS values:<ul><li>mm = Bits per symbol;</li><li>nn = Symbols per block;</li><li>alpha_to = log lookup table array;</li><li>index_of = Antilog lookup table array;</li><li>genpoly = Generator polynomial array;</li><li>nroots = Number of generator;</li><li>roots = number of parity symbols;</li><li>fcr = First consecutive root, index form;</li><li>prim = Primitive element, index form;</li><li>iprim = prim-th root of 1, index form;</li><li>pad = Padding bytes in shortened block;</li><li>gfpoly</ul>.
2701 */
2702 protected function init_rs($symsize, $gfpoly, $fcr, $prim, $nroots, $pad) {
2703 foreach ($this->rsitems as $rs) {
2704 if (($rs['pad'] != $pad) OR ($rs['nroots'] != $nroots) OR ($rs['mm'] != $symsize)
2705 OR ($rs['gfpoly'] != $gfpoly) OR ($rs['fcr'] != $fcr) OR ($rs['prim'] != $prim)) {
2706 continue;
2707 }
2708 return $rs;
2709 }
2710 $rs = $this->init_rs_char($symsize, $gfpoly, $fcr, $prim, $nroots, $pad);
2711 array_unshift($this->rsitems, $rs);
2712 return $rs;
2713 }
2714
2715 // - - - - - - - - - - - - - - - - - - - - - - - - -
2716
2717 // QRrsItem
2718
2719 /**
2720 * modnn
2721 * @param $rs (array) RS values
2722 * @param $x (int) X position
2723 * @return int X osition
2724 */
2725 protected function modnn($rs, $x) {
2726 while ($x >= $rs['nn']) {
2727 $x -= $rs['nn'];
2728 $x = ($x >> $rs['mm']) + ($x & $rs['nn']);
2729 }
2730 return $x;
2731 }
2732
2733 /**
2734 * Initialize a Reed-Solomon codec and returns an array of values.
2735 * @param $symsize (int) symbol size, bits
2736 * @param $gfpoly (int) Field generator polynomial coefficients
2737 * @param $fcr (int) first root of RS code generator polynomial, index form
2738 * @param $prim (int) primitive element to generate polynomial roots
2739 * @param $nroots (int) RS code generator polynomial degree (number of roots)
2740 * @param $pad (int) padding bytes at front of shortened block
2741 * @return array Array of RS values:<ul><li>mm = Bits per symbol;</li><li>nn = Symbols per block;</li><li>alpha_to = log lookup table array;</li><li>index_of = Antilog lookup table array;</li><li>genpoly = Generator polynomial array;</li><li>nroots = Number of generator;</li><li>roots = number of parity symbols;</li><li>fcr = First consecutive root, index form;</li><li>prim = Primitive element, index form;</li><li>iprim = prim-th root of 1, index form;</li><li>pad = Padding bytes in shortened block;</li><li>gfpoly</ul>.
2742 */
2743 protected function init_rs_char($symsize, $gfpoly, $fcr, $prim, $nroots, $pad) {
2744 // Based on Reed solomon encoder by Phil Karn, KA9Q (GNU-LGPLv2)
2745 $rs = null;
2746 // Check parameter ranges
2747 if (($symsize < 0) OR ($symsize > 8)) {
2748 return $rs;
2749 }
2750 if (($fcr < 0) OR ($fcr >= (1<<$symsize))) {
2751 return $rs;
2752 }
2753 if (($prim <= 0) OR ($prim >= (1<<$symsize))) {
2754 return $rs;
2755 }
2756 if (($nroots < 0) OR ($nroots >= (1<<$symsize))) {
2757 return $rs;
2758 }
2759 if (($pad < 0) OR ($pad >= ((1<<$symsize) -1 - $nroots))) {
2760 return $rs;
2761 }
2762 $rs = array();
2763 $rs['mm'] = $symsize;
2764 $rs['nn'] = (1 << $symsize) - 1;
2765 $rs['pad'] = $pad;
2766 $rs['alpha_to'] = array_fill(0, ($rs['nn'] + 1), 0);
2767 $rs['index_of'] = array_fill(0, ($rs['nn'] + 1), 0);
2768 // PHP style macro replacement ;)
2769 $NN =& $rs['nn'];
2770 $A0 =& $NN;
2771 // Generate Galois field lookup tables
2772 $rs['index_of'][0] = $A0; // log(zero) = -inf
2773 $rs['alpha_to'][$A0] = 0; // alpha**-inf = 0
2774 $sr = 1;
2775 for ($i=0; $i<$rs['nn']; ++$i) {
2776 $rs['index_of'][$sr] = $i;
2777 $rs['alpha_to'][$i] = $sr;
2778 $sr <<= 1;
2779 if ($sr & (1 << $symsize)) {
2780 $sr ^= $gfpoly;
2781 }
2782 $sr &= $rs['nn'];
2783 }
2784 if ($sr != 1) {
2785 // field generator polynomial is not primitive!
2786 return NULL;
2787 }
2788 // Form RS code generator polynomial from its roots
2789 $rs['genpoly'] = array_fill(0, ($nroots + 1), 0);
2790 $rs['fcr'] = $fcr;
2791 $rs['prim'] = $prim;
2792 $rs['nroots'] = $nroots;
2793 $rs['gfpoly'] = $gfpoly;
2794 // Find prim-th root of 1, used in decoding
2795 for ($iprim=1; ($iprim % $prim) != 0; $iprim += $rs['nn']) {
2796 ; // intentional empty-body loop!
2797 }
2798 $rs['iprim'] = (int)($iprim / $prim);
2799 $rs['genpoly'][0] = 1;
2800 for ($i = 0,$root=$fcr*$prim; $i < $nroots; $i++, $root += $prim) {
2801 $rs['genpoly'][$i+1] = 1;
2802 // Multiply rs->genpoly[] by @**(root + x)
2803 for ($j = $i; $j > 0; --$j) {
2804 if ($rs['genpoly'][$j] != 0) {
2805 $rs['genpoly'][$j] = $rs['genpoly'][$j-1] ^ $rs['alpha_to'][$this->modnn($rs, $rs['index_of'][$rs['genpoly'][$j]] + $root)];
2806 } else {
2807 $rs['genpoly'][$j] = $rs['genpoly'][$j-1];
2808 }
2809 }
2810 // rs->genpoly[0] can never be zero
2811 $rs['genpoly'][0] = $rs['alpha_to'][$this->modnn($rs, $rs['index_of'][$rs['genpoly'][0]] + $root)];
2812 }
2813 // convert rs->genpoly[] to index form for quicker encoding
2814 for ($i = 0; $i <= $nroots; ++$i) {
2815 $rs['genpoly'][$i] = $rs['index_of'][$rs['genpoly'][$i]];
2816 }
2817 return $rs;
2818 }
2819
2820 /**
2821 * Encode a Reed-Solomon codec and returns the parity array
2822 * @param $rs (array) RS values
2823 * @param $data (array) data
2824 * @param $parity (array) parity
2825 * @return parity array
2826 */
2827 protected function encode_rs_char($rs, $data, $parity) {
2828 $MM =& $rs['mm']; // bits per symbol
2829 $NN =& $rs['nn']; // the total number of symbols in a RS block
2830 $ALPHA_TO =& $rs['alpha_to']; // the address of an array of NN elements to convert Galois field elements in index (log) form to polynomial form
2831 $INDEX_OF =& $rs['index_of']; // the address of an array of NN elements to convert Galois field elements in polynomial form to index (log) form
2832 $GENPOLY =& $rs['genpoly']; // an array of NROOTS+1 elements containing the generator polynomial in index form
2833 $NROOTS =& $rs['nroots']; // the number of roots in the RS code generator polynomial, which is the same as the number of parity symbols in a block
2834 $FCR =& $rs['fcr']; // first consecutive root, index form
2835 $PRIM =& $rs['prim']; // primitive element, index form
2836 $IPRIM =& $rs['iprim']; // prim-th root of 1, index form
2837 $PAD =& $rs['pad']; // the number of pad symbols in a block
2838 $A0 =& $NN;
2839 $parity = array_fill(0, $NROOTS, 0);
2840 for ($i=0; $i < ($NN - $NROOTS - $PAD); $i++) {
2841 $feedback = $INDEX_OF[$data[$i] ^ $parity[0]];
2842 if ($feedback != $A0) {
2843 // feedback term is non-zero
2844 // This line is unnecessary when GENPOLY[NROOTS] is unity, as it must
2845 // always be for the polynomials constructed by init_rs()
2846 $feedback = $this->modnn($rs, $NN - $GENPOLY[$NROOTS] + $feedback);
2847 for ($j=1; $j < $NROOTS; ++$j) {
2848 $parity[$j] ^= $ALPHA_TO[$this->modnn($rs, $feedback + $GENPOLY[($NROOTS - $j)])];
2849 }
2850 }
2851 // Shift
2852 array_shift($parity);
2853 if ($feedback != $A0) {
2854 array_push($parity, $ALPHA_TO[$this->modnn($rs, $feedback + $GENPOLY[0])]);
2855 } else {
2856 array_push($parity, 0);
2857 }
2858 }
2859 return $parity;
2860 }
2861
2862 } // end QRcode class
2863
2864 //============================================================+
2865 // END OF FILE
2866 //============================================================+
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