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1<?php
2//============================================================+
3// File name : tcpdf_parser.php
4// Version : 1.0.014
5// Begin : 2011-05-23
6// Last Update : 2014-02-18
7// Author : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com
8// License : http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT GNU-LGPLv3
9// -------------------------------------------------------------------
10// Copyright (C) 2011-2014 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 License
25// along with TCPDF. If not, see
26// <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>.
27//
28// See LICENSE.TXT file for more information.
29// -------------------------------------------------------------------
30//
31// Description : This is a PHP class for parsing PDF documents.
32//
33//============================================================+
34
35/**
36 * @file
37 * This is a PHP class for parsing PDF documents.<br>
38 * @package com.tecnick.tcpdf
39 * @author Nicola Asuni
40 * @version 1.0.014
41 */
42
43// include class for decoding filters
44require_once(dirname(__FILE__).'/include/tcpdf_filters.php');
45
46/**
47 * @class TCPDF_PARSER
48 * This is a PHP class for parsing PDF documents.<br>
49 * @package com.tecnick.tcpdf
50 * @brief This is a PHP class for parsing PDF documents..
51 * @version 1.0.010
52 * @author Nicola Asuni - info@tecnick.com
53 */
54class TCPDF_PARSER {
55
56 /**
57 * Raw content of the PDF document.
58 * @private
59 */
60 private $pdfdata = '';
61
62 /**
63 * XREF data.
64 * @protected
65 */
66 protected $xref = array();
67
68 /**
69 * Array of PDF objects.
70 * @protected
71 */
72 protected $objects = array();
73
74 /**
75 * Class object for decoding filters.
76 * @private
77 */
78 private $FilterDecoders;
79
80 /**
81 * Array of configuration parameters.
82 * @private
83 */
84 private $cfg = array(
85 'die_for_errors' => false,
86 'ignore_filter_decoding_errors' => true,
87 'ignore_missing_filter_decoders' => true,
88 );
89
90// -----------------------------------------------------------------------------
91
92 /**
93 * Parse a PDF document an return an array of objects.
94 * @param $data (string) PDF data to parse.
95 * @param $cfg (array) Array of configuration parameters:
96 * 'die_for_errors' : if true termitate the program execution in case of error, otherwise thows an exception;
97 * 'ignore_filter_decoding_errors' : if true ignore filter decoding errors;
98 * 'ignore_missing_filter_decoders' : if true ignore missing filter decoding errors.
99 * @public
100 * @since 1.0.000 (2011-05-24)
101 */
102 public function __construct($data, $cfg=array()) {
103 if (empty($data)) {
104 $this->Error('Empty PDF data.');
105 }
106 // find the pdf header starting position
107 if (($trimpos = strpos($data, '%PDF-')) === FALSE) {
108 $this->Error('Invalid PDF data: missing %PDF header.');
109 }
110 // get PDF content string
111 $this->pdfdata = substr($data, $trimpos);
112 // get length
113 $pdflen = strlen($this->pdfdata);
114 // set configuration parameters
115 $this->setConfig($cfg);
116 // get xref and trailer data
117 $this->xref = $this->getXrefData();
118 // parse all document objects
119 $this->objects = array();
120 foreach ($this->xref['xref'] as $obj => $offset) {
121 if (!isset($this->objects[$obj]) AND ($offset > 0)) {
122 // decode objects with positive offset
123 $this->objects[$obj] = $this->getIndirectObject($obj, $offset, true);
124 }
125 }
126 // release some memory
127 unset($this->pdfdata);
128 $this->pdfdata = '';
129 }
130
131 /**
132 * Set the configuration parameters.
133 * @param $cfg (array) Array of configuration parameters:
134 * 'die_for_errors' : if true termitate the program execution in case of error, otherwise thows an exception;
135 * 'ignore_filter_decoding_errors' : if true ignore filter decoding errors;
136 * 'ignore_missing_filter_decoders' : if true ignore missing filter decoding errors.
137 * @public
138 */
139 protected function setConfig($cfg) {
140 if (isset($cfg['die_for_errors'])) {
141 $this->cfg['die_for_errors'] = !!$cfg['die_for_errors'];
142 }
143 if (isset($cfg['ignore_filter_decoding_errors'])) {
144 $this->cfg['ignore_filter_decoding_errors'] = !!$cfg['ignore_filter_decoding_errors'];
145 }
146 if (isset($cfg['ignore_missing_filter_decoders'])) {
147 $this->cfg['ignore_missing_filter_decoders'] = !!$cfg['ignore_missing_filter_decoders'];
148 }
149 }
150
151 /**
152 * Return an array of parsed PDF document objects.
153 * @return (array) Array of parsed PDF document objects.
154 * @public
155 * @since 1.0.000 (2011-06-26)
156 */
157 public function getParsedData() {
158 return array($this->xref, $this->objects);
159 }
160
161 /**
162 * Get Cross-Reference (xref) table and trailer data from PDF document data.
163 * @param $offset (int) xref offset (if know).
164 * @param $xref (array) previous xref array (if any).
165 * @return Array containing xref and trailer data.
166 * @protected
167 * @since 1.0.000 (2011-05-24)
168 */
169 protected function getXrefData($offset=0, $xref=array()) {
170 if ($offset == 0) {
171 // find last startxref
172 if (preg_match_all('/[\r\n]startxref[\s]*[\r\n]+([0-9]+)[\s]*[\r\n]+%%EOF/i', $this->pdfdata, $matches, PREG_SET_ORDER, $offset) == 0) {
173 $this->Error('Unable to find startxref');
174 }
175 $matches = array_pop($matches);
176 $startxref = $matches[1];
177 } elseif (strpos($this->pdfdata, 'xref', $offset) == $offset) {
178 // Already pointing at the xref table
179 $startxref = $offset;
180 } elseif (preg_match('/([0-9]+[\s][0-9]+[\s]obj)/i', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset)) {
181 // Cross-Reference Stream object
182 $startxref = $offset;
183 } elseif (preg_match('/[\r\n]startxref[\s]*[\r\n]+([0-9]+)[\s]*[\r\n]+%%EOF/i', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset)) {
184 // startxref found
185 $startxref = $matches[1][0];
186 } else {
187 $this->Error('Unable to find startxref');
188 }
189 // check xref position
190 if (strpos($this->pdfdata, 'xref', $startxref) == $startxref) {
191 // Cross-Reference
192 $xref = $this->decodeXref($startxref, $xref);
193 } else {
194 // Cross-Reference Stream
195 $xref = $this->decodeXrefStream($startxref, $xref);
196 }
197 if (empty($xref)) {
198 $this->Error('Unable to find xref');
199 }
200 return $xref;
201 }
202
203 /**
204 * Decode the Cross-Reference section
205 * @param $startxref (int) Offset at which the xref section starts (position of the 'xref' keyword).
206 * @param $xref (array) Previous xref array (if any).
207 * @return Array containing xref and trailer data.
208 * @protected
209 * @since 1.0.000 (2011-06-20)
210 */
211 protected function decodeXref($startxref, $xref=array()) {
212 $startxref += 4; // 4 is the lenght of the word 'xref'
213 // skip initial white space chars: \x00 null (NUL), \x09 horizontal tab (HT), \x0A line feed (LF), \x0C form feed (FF), \x0D carriage return (CR), \x20 space (SP)
214 $offset = $startxref + strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $startxref);
215 // initialize object number
216 $obj_num = 0;
217 // search for cross-reference entries or subsection
218 while (preg_match('/([0-9]+)[\x20]([0-9]+)[\x20]?([nf]?)(\r\n|[\x20]?[\r\n])/', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
219 if ($matches[0][1] != $offset) {
220 // we are on another section
221 break;
222 }
223 $offset += strlen($matches[0][0]);
224 if ($matches[3][0] == 'n') {
225 // create unique object index: [object number]_[generation number]
226 $index = $obj_num.'_'.intval($matches[2][0]);
227 // check if object already exist
228 if (!isset($xref['xref'][$index])) {
229 // store object offset position
230 $xref['xref'][$index] = intval($matches[1][0]);
231 }
232 ++$obj_num;
233 } elseif ($matches[3][0] == 'f') {
234 ++$obj_num;
235 } else {
236 // object number (index)
237 $obj_num = intval($matches[1][0]);
238 }
239 }
240 // get trailer data
241 if (preg_match('/trailer[\s]*<<(.*)>>/isU', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
242 $trailer_data = $matches[1][0];
243 if (!isset($xref['trailer']) OR empty($xref['trailer'])) {
244 // get only the last updated version
245 $xref['trailer'] = array();
246 // parse trailer_data
247 if (preg_match('/Size[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
248 $xref['trailer']['size'] = intval($matches[1]);
249 }
250 if (preg_match('/Root[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
251 $xref['trailer']['root'] = intval($matches[1]).'_'.intval($matches[2]);
252 }
253 if (preg_match('/Encrypt[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
254 $xref['trailer']['encrypt'] = intval($matches[1]).'_'.intval($matches[2]);
255 }
256 if (preg_match('/Info[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
257 $xref['trailer']['info'] = intval($matches[1]).'_'.intval($matches[2]);
258 }
259 if (preg_match('/ID[\s]*[\[][\s]*[<]([^>]*)[>][\s]*[<]([^>]*)[>]/i', $trailer_data, $matches) > 0) {
260 $xref['trailer']['id'] = array();
261 $xref['trailer']['id'][0] = $matches[1];
262 $xref['trailer']['id'][1] = $matches[2];
263 }
264 }
265 if (preg_match('/Prev[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
266 // get previous xref
267 $xref = $this->getXrefData(intval($matches[1]), $xref);
268 }
269 } else {
270 $this->Error('Unable to find trailer');
271 }
272 return $xref;
273 }
274
275 /**
276 * Decode the Cross-Reference Stream section
277 * @param $startxref (int) Offset at which the xref section starts.
278 * @param $xref (array) Previous xref array (if any).
279 * @return Array containing xref and trailer data.
280 * @protected
281 * @since 1.0.003 (2013-03-16)
282 */
283 protected function decodeXrefStream($startxref, $xref=array()) {
284 // try to read Cross-Reference Stream
285 $xrefobj = $this->getRawObject($startxref);
286 $xrefcrs = $this->getIndirectObject($xrefobj[1], $startxref, true);
287 if (!isset($xref['trailer']) OR empty($xref['trailer'])) {
288 // get only the last updated version
289 $xref['trailer'] = array();
290 $filltrailer = true;
291 } else {
292 $filltrailer = false;
293 }
294 if (!isset($xref['xref'])) {
295 $xref['xref'] = array();
296 }
297 $valid_crs = false;
298 $columns = 0;
299 $sarr = $xrefcrs[0][1];
300 foreach ($sarr as $k => $v) {
301 if (($v[0] == '/') AND ($v[1] == 'Type') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == '/') AND ($sarr[($k +1)][1] == 'XRef'))) {
302 $valid_crs = true;
303 } elseif (($v[0] == '/') AND ($v[1] == 'Index') AND (isset($sarr[($k +1)]))) {
304 // first object number in the subsection
305 $index_first = intval($sarr[($k +1)][1][0][1]);
306 // number of entries in the subsection
307 $index_entries = intval($sarr[($k +1)][1][1][1]);
308 } elseif (($v[0] == '/') AND ($v[1] == 'Prev') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) {
309 // get previous xref offset
310 $prevxref = intval($sarr[($k +1)][1]);
311 } elseif (($v[0] == '/') AND ($v[1] == 'W') AND (isset($sarr[($k +1)]))) {
312 // number of bytes (in the decoded stream) of the corresponding field
313 $wb = array();
314 $wb[0] = intval($sarr[($k +1)][1][0][1]);
315 $wb[1] = intval($sarr[($k +1)][1][1][1]);
316 $wb[2] = intval($sarr[($k +1)][1][2][1]);
317 } elseif (($v[0] == '/') AND ($v[1] == 'DecodeParms') AND (isset($sarr[($k +1)][1]))) {
318 $decpar = $sarr[($k +1)][1];
319 foreach ($decpar as $kdc => $vdc) {
320 if (($vdc[0] == '/') AND ($vdc[1] == 'Columns') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) {
321 $columns = intval($decpar[($kdc +1)][1]);
322 } elseif (($vdc[0] == '/') AND ($vdc[1] == 'Predictor') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) {
323 $predictor = intval($decpar[($kdc +1)][1]);
324 }
325 }
326 } elseif ($filltrailer) {
327 if (($v[0] == '/') AND ($v[1] == 'Size') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) {
328 $xref['trailer']['size'] = $sarr[($k +1)][1];
329 } elseif (($v[0] == '/') AND ($v[1] == 'Root') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) {
330 $xref['trailer']['root'] = $sarr[($k +1)][1];
331 } elseif (($v[0] == '/') AND ($v[1] == 'Info') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) {
332 $xref['trailer']['info'] = $sarr[($k +1)][1];
333 } elseif (($v[0] == '/') AND ($v[1] == 'Encrypt') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) {
334 $xref['trailer']['encrypt'] = $sarr[($k +1)][1];
335 } elseif (($v[0] == '/') AND ($v[1] == 'ID') AND (isset($sarr[($k +1)]))) {
336 $xref['trailer']['id'] = array();
337 $xref['trailer']['id'][0] = $sarr[($k +1)][1][0][1];
338 $xref['trailer']['id'][1] = $sarr[($k +1)][1][1][1];
339 }
340 }
341 }
342 // decode data
343 if ($valid_crs AND isset($xrefcrs[1][3][0])) {
344 // number of bytes in a row
345 $rowlen = ($columns + 1);
346 // convert the stream into an array of integers
347 $sdata = unpack('C*', $xrefcrs[1][3][0]);
348 // split the rows
349 $sdata = array_chunk($sdata, $rowlen);
350 // initialize decoded array
351 $ddata = array();
352 // initialize first row with zeros
353 $prev_row = array_fill (0, $rowlen, 0);
354 // for each row apply PNG unpredictor
355 foreach ($sdata as $k => $row) {
356 // initialize new row
357 $ddata[$k] = array();
358 // get PNG predictor value
359 $predictor = (10 + $row[0]);
360 // for each byte on the row
361 for ($i=1; $i<=$columns; ++$i) {
362 // new index
363 $j = ($i - 1);
364 $row_up = $prev_row[$j];
365 if ($i == 1) {
366 $row_left = 0;
367 $row_upleft = 0;
368 } else {
369 $row_left = $row[($i - 1)];
370 $row_upleft = $prev_row[($j - 1)];
371 }
372 switch ($predictor) {
373 case 10: { // PNG prediction (on encoding, PNG None on all rows)
374 $ddata[$k][$j] = $row[$i];
375 break;
376 }
377 case 11: { // PNG prediction (on encoding, PNG Sub on all rows)
378 $ddata[$k][$j] = (($row[$i] + $row_left) & 0xff);
379 break;
380 }
381 case 12: { // PNG prediction (on encoding, PNG Up on all rows)
382 $ddata[$k][$j] = (($row[$i] + $row_up) & 0xff);
383 break;
384 }
385 case 13: { // PNG prediction (on encoding, PNG Average on all rows)
386 $ddata[$k][$j] = (($row[$i] + (($row_left + $row_up) / 2)) & 0xff);
387 break;
388 }
389 case 14: { // PNG prediction (on encoding, PNG Paeth on all rows)
390 // initial estimate
391 $p = ($row_left + $row_up - $row_upleft);
392 // distances
393 $pa = abs($p - $row_left);
394 $pb = abs($p - $row_up);
395 $pc = abs($p - $row_upleft);
396 $pmin = min($pa, $pb, $pc);
397 // return minumum distance
398 switch ($pmin) {
399 case $pa: {
400 $ddata[$k][$j] = (($row[$i] + $row_left) & 0xff);
401 break;
402 }
403 case $pb: {
404 $ddata[$k][$j] = (($row[$i] + $row_up) & 0xff);
405 break;
406 }
407 case $pc: {
408 $ddata[$k][$j] = (($row[$i] + $row_upleft) & 0xff);
409 break;
410 }
411 }
412 break;
413 }
414 default: { // PNG prediction (on encoding, PNG optimum)
415 $this->Error('Unknown PNG predictor');
416 break;
417 }
418 }
419 }
420 $prev_row = $ddata[$k];
421 } // end for each row
422 // complete decoding
423 $sdata = array();
424 // for every row
425 foreach ($ddata as $k => $row) {
426 // initialize new row
427 $sdata[$k] = array(0, 0, 0);
428 if ($wb[0] == 0) {
429 // default type field
430 $sdata[$k][0] = 1;
431 }
432 $i = 0; // count bytes in the row
433 // for every column
434 for ($c = 0; $c < 3; ++$c) {
435 // for every byte on the column
436 for ($b = 0; $b < $wb[$c]; ++$b) {
437 if (isset($row[$i])) {
438 $sdata[$k][$c] += ($row[$i] << (($wb[$c] - 1 - $b) * 8));
439 }
440 ++$i;
441 }
442 }
443 }
444 $ddata = array();
445 // fill xref
446 if (isset($index_first)) {
447 $obj_num = $index_first;
448 } else {
449 $obj_num = 0;
450 }
451 foreach ($sdata as $k => $row) {
452 switch ($row[0]) {
453 case 0: { // (f) linked list of free objects
454 break;
455 }
456 case 1: { // (n) objects that are in use but are not compressed
457 // create unique object index: [object number]_[generation number]
458 $index = $obj_num.'_'.$row[2];
459 // check if object already exist
460 if (!isset($xref['xref'][$index])) {
461 // store object offset position
462 $xref['xref'][$index] = $row[1];
463 }
464 break;
465 }
466 case 2: { // compressed objects
467 // $row[1] = object number of the object stream in which this object is stored
468 // $row[2] = index of this object within the object stream
469 $index = $row[1].'_0_'.$row[2];
470 $xref['xref'][$index] = -1;
471 break;
472 }
473 default: { // null objects
474 break;
475 }
476 }
477 ++$obj_num;
478 }
479 } // end decoding data
480 if (isset($prevxref)) {
481 // get previous xref
482 $xref = $this->getXrefData($prevxref, $xref);
483 }
484 return $xref;
485 }
486
487 /**
488 * Get object type, raw value and offset to next object
489 * @param $offset (int) Object offset.
490 * @return array containing object type, raw value and offset to next object
491 * @protected
492 * @since 1.0.000 (2011-06-20)
493 */
494 protected function getRawObject($offset=0) {
495 $objtype = ''; // object type to be returned
496 $objval = ''; // object value to be returned
497 // skip initial white space chars: \x00 null (NUL), \x09 horizontal tab (HT), \x0A line feed (LF), \x0C form feed (FF), \x0D carriage return (CR), \x20 space (SP)
498 $offset += strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $offset);
499 // get first char
500 $char = $this->pdfdata[$offset];
501 // get object type
502 switch ($char) {
503 case '%': { // \x25 PERCENT SIGN
504 // skip comment and search for next token
505 $next = strcspn($this->pdfdata, "\r\n", $offset);
506 if ($next > 0) {
507 $offset += $next;
508 return $this->getRawObject($offset);
509 }
510 break;
511 }
512 case '/': { // \x2F SOLIDUS
513 // name object
514 $objtype = $char;
515 ++$offset;
516 if (preg_match('/^([^\x00\x09\x0a\x0c\x0d\x20\s\x28\x29\x3c\x3e\x5b\x5d\x7b\x7d\x2f\x25]+)/', substr($this->pdfdata, $offset, 256), $matches) == 1) {
517 $objval = $matches[1]; // unescaped value
518 $offset += strlen($objval);
519 }
520 break;
521 }
522 case '(': // \x28 LEFT PARENTHESIS
523 case ')': { // \x29 RIGHT PARENTHESIS
524 // literal string object
525 $objtype = $char;
526 ++$offset;
527 $strpos = $offset;
528 if ($char == '(') {
529 $open_bracket = 1;
530 while ($open_bracket > 0) {
531 if (!isset($this->pdfdata{$strpos})) {
532 break;
533 }
534 $ch = $this->pdfdata{$strpos};
535 switch ($ch) {
536 case '\\': { // REVERSE SOLIDUS (5Ch) (Backslash)
537 // skip next character
538 ++$strpos;
539 break;
540 }
541 case '(': { // LEFT PARENHESIS (28h)
542 ++$open_bracket;
543 break;
544 }
545 case ')': { // RIGHT PARENTHESIS (29h)
546 --$open_bracket;
547 break;
548 }
549 }
550 ++$strpos;
551 }
552 $objval = substr($this->pdfdata, $offset, ($strpos - $offset - 1));
553 $offset = $strpos;
554 }
555 break;
556 }
557 case '[': // \x5B LEFT SQUARE BRACKET
558 case ']': { // \x5D RIGHT SQUARE BRACKET
559 // array object
560 $objtype = $char;
561 ++$offset;
562 if ($char == '[') {
563 // get array content
564 $objval = array();
565 do {
566 // get element
567 $element = $this->getRawObject($offset);
568 $offset = $element[2];
569 $objval[] = $element;
570 } while ($element[0] != ']');
571 // remove closing delimiter
572 array_pop($objval);
573 }
574 break;
575 }
576 case '<': // \x3C LESS-THAN SIGN
577 case '>': { // \x3E GREATER-THAN SIGN
578 if (isset($this->pdfdata{($offset + 1)}) AND ($this->pdfdata{($offset + 1)} == $char)) {
579 // dictionary object
580 $objtype = $char.$char;
581 $offset += 2;
582 if ($char == '<') {
583 // get array content
584 $objval = array();
585 do {
586 // get element
587 $element = $this->getRawObject($offset);
588 $offset = $element[2];
589 $objval[] = $element;
590 } while ($element[0] != '>>');
591 // remove closing delimiter
592 array_pop($objval);
593 }
594 } else {
595 // hexadecimal string object
596 $objtype = $char;
597 ++$offset;
598 if (($char == '<') AND (preg_match('/^([0-9A-Fa-f\x09\x0a\x0c\x0d\x20]+)>/iU', substr($this->pdfdata, $offset), $matches) == 1)) {
599 // remove white space characters
600 $objval = strtr($matches[1], "\x09\x0a\x0c\x0d\x20", '');
601 $offset += strlen($matches[0]);
602 } elseif (($endpos = strpos($this->pdfdata, '>', $offset)) !== FALSE) {
603 $offset = $endpos + 1;
604 }
605 }
606 break;
607 }
608 default: {
609 if (substr($this->pdfdata, $offset, 6) == 'endobj') {
610 // indirect object
611 $objtype = 'endobj';
612 $offset += 6;
613 } elseif (substr($this->pdfdata, $offset, 4) == 'null') {
614 // null object
615 $objtype = 'null';
616 $offset += 4;
617 $objval = 'null';
618 } elseif (substr($this->pdfdata, $offset, 4) == 'true') {
619 // boolean true object
620 $objtype = 'boolean';
621 $offset += 4;
622 $objval = 'true';
623 } elseif (substr($this->pdfdata, $offset, 5) == 'false') {
624 // boolean false object
625 $objtype = 'boolean';
626 $offset += 5;
627 $objval = 'false';
628 } elseif (substr($this->pdfdata, $offset, 6) == 'stream') {
629 // start stream object
630 $objtype = 'stream';
631 $offset += 6;
632 if (preg_match('/^([\r]?[\n])/isU', substr($this->pdfdata, $offset), $matches) == 1) {
633 $offset += strlen($matches[0]);
634 if (preg_match('/(endstream)[\x09\x0a\x0c\x0d\x20]/isU', substr($this->pdfdata, $offset), $matches, PREG_OFFSET_CAPTURE) == 1) {
635 $objval = substr($this->pdfdata, $offset, $matches[0][1]);
636 $offset += $matches[1][1];
637 }
638 }
639 } elseif (substr($this->pdfdata, $offset, 9) == 'endstream') {
640 // end stream object
641 $objtype = 'endstream';
642 $offset += 9;
643 } elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+R/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
644 // indirect object reference
645 $objtype = 'objref';
646 $offset += strlen($matches[0]);
647 $objval = intval($matches[1]).'_'.intval($matches[2]);
648 } elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+obj/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
649 // object start
650 $objtype = 'obj';
651 $objval = intval($matches[1]).'_'.intval($matches[2]);
652 $offset += strlen ($matches[0]);
653 } elseif (($numlen = strspn($this->pdfdata, '+-.0123456789', $offset)) > 0) {
654 // numeric object
655 $objtype = 'numeric';
656 $objval = substr($this->pdfdata, $offset, $numlen);
657 $offset += $numlen;
658 }
659 break;
660 }
661 }
662 return array($objtype, $objval, $offset);
663 }
664
665 /**
666 * Get content of indirect object.
667 * @param $obj_ref (string) Object number and generation number separated by underscore character.
668 * @param $offset (int) Object offset.
669 * @param $decoding (boolean) If true decode streams.
670 * @return array containing object data.
671 * @protected
672 * @since 1.0.000 (2011-05-24)
673 */
674 protected function getIndirectObject($obj_ref, $offset=0, $decoding=true) {
675 $obj = explode('_', $obj_ref);
676 if (($obj === false) OR (count($obj) != 2)) {
677 $this->Error('Invalid object reference: '.$obj);
678 return;
679 }
680 $objref = $obj[0].' '.$obj[1].' obj';
681 // ignore leading zeros
682 $offset += strspn($this->pdfdata, '0', $offset);
683 if (strpos($this->pdfdata, $objref, $offset) != $offset) {
684 // an indirect reference to an undefined object shall be considered a reference to the null object
685 return array('null', 'null', $offset);
686 }
687 // starting position of object content
688 $offset += strlen($objref);
689 // get array of object content
690 $objdata = array();
691 $i = 0; // object main index
692 do {
693 // get element
694 $element = $this->getRawObject($offset);
695 $offset = $element[2];
696 // decode stream using stream's dictionary information
697 if ($decoding AND ($element[0] == 'stream') AND (isset($objdata[($i - 1)][0])) AND ($objdata[($i - 1)][0] == '<<')) {
698 $element[3] = $this->decodeStream($objdata[($i - 1)][1], $element[1]);
699 }
700 $objdata[$i] = $element;
701 ++$i;
702 } while ($element[0] != 'endobj');
703 // remove closing delimiter
704 array_pop($objdata);
705 // return raw object content
706 return $objdata;
707 }
708
709 /**
710 * Get the content of object, resolving indect object reference if necessary.
711 * @param $obj (string) Object value.
712 * @return array containing object data.
713 * @protected
714 * @since 1.0.000 (2011-06-26)
715 */
716 protected function getObjectVal($obj) {
717 if ($obj[0] == 'objref') {
718 // reference to indirect object
719 if (isset($this->objects[$obj[1]])) {
720 // this object has been already parsed
721 return $this->objects[$obj[1]];
722 } elseif (isset($this->xref[$obj[1]])) {
723 // parse new object
724 $this->objects[$obj[1]] = $this->getIndirectObject($obj[1], $this->xref[$obj[1]], false);
725 return $this->objects[$obj[1]];
726 }
727 }
728 return $obj;
729 }
730
731 /**
732 * Decode the specified stream.
733 * @param $sdic (array) Stream's dictionary array.
734 * @param $stream (string) Stream to decode.
735 * @return array containing decoded stream data and remaining filters.
736 * @protected
737 * @since 1.0.000 (2011-06-22)
738 */
739 protected function decodeStream($sdic, $stream) {
740 // get stream lenght and filters
741 $slength = strlen($stream);
742 if ($slength <= 0) {
743 return array('', array());
744 }
745 $filters = array();
746 foreach ($sdic as $k => $v) {
747 if ($v[0] == '/') {
748 if (($v[1] == 'Length') AND (isset($sdic[($k + 1)])) AND ($sdic[($k + 1)][0] == 'numeric')) {
749 // get declared stream lenght
750 $declength = intval($sdic[($k + 1)][1]);
751 if ($declength < $slength) {
752 $stream = substr($stream, 0, $declength);
753 $slength = $declength;
754 }
755 } elseif (($v[1] == 'Filter') AND (isset($sdic[($k + 1)]))) {
756 // resolve indirect object
757 $objval = $this->getObjectVal($sdic[($k + 1)]);
758 if ($objval[0] == '/') {
759 // single filter
760 $filters[] = $objval[1];
761 } elseif ($objval[0] == '[') {
762 // array of filters
763 foreach ($objval[1] as $flt) {
764 if ($flt[0] == '/') {
765 $filters[] = $flt[1];
766 }
767 }
768 }
769 }
770 }
771 }
772 // decode the stream
773 $remaining_filters = array();
774 foreach ($filters as $filter) {
775 if (in_array($filter, TCPDF_FILTERS::getAvailableFilters())) {
776 try {
777 $stream = TCPDF_FILTERS::decodeFilter($filter, $stream);
778 } catch (Exception $e) {
779 $emsg = $e->getMessage();
780 if ((($emsg[0] == '~') AND !$this->cfg['ignore_missing_filter_decoders'])
781 OR (($emsg[0] != '~') AND !$this->cfg['ignore_filter_decoding_errors'])) {
782 $this->Error($e->getMessage());
783 }
784 }
785 } else {
786 // add missing filter to array
787 $remaining_filters[] = $filter;
788 }
789 }
790 return array($stream, $remaining_filters);
791 }
792
793 /**
794 * Throw an exception or print an error message and die if the K_TCPDF_PARSER_THROW_EXCEPTION_ERROR constant is set to true.
795 * @param $msg (string) The error message
796 * @public
797 * @since 1.0.000 (2011-05-23)
798 */
799 public function Error($msg) {
800 if ($this->cfg['die_for_errors']) {
801 die('<strong>TCPDF_PARSER ERROR: </strong>'.$msg);
802 } else {
803 throw new Exception('TCPDF_PARSER ERROR: '.$msg);
804 }
805 }
806
807} // END OF TCPDF_PARSER CLASS
808
809//============================================================+
810// END OF FILE
811//============================================================+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 17:02:10 +0000