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tcpdf_parser.php
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1 <?php
2 //============================================================+
3 // File name : tcpdf_parser.php
4 // Version : 1.0.003
5 // Begin : 2011-05-23
6 // Last Update : 2013-03-17
7 // Author : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com
8 // License : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html)
9 // -------------------------------------------------------------------
10 // Copyright (C) 2011-2013 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 
43 // include class for decoding filters
44 require_once(dirname( __FILE__ ) . '/include/tcpdf_filters.php');
45 
54 class TCPDF_PARSER {
55 
60  private $pdfdata = '';
61 
66  protected $xref = array();
67 
72  protected $objects = array();
73 
78  private $FilterDecoders;
79 
80 // -----------------------------------------------------------------------------
81 
88  public function __construct($data) {
89  if (empty($data)) {
90  $this->Error('Empty PDF data.');
91  }
92  $this->pdfdata = $data;
93  // get length
94  $pdflen = strlen($this->pdfdata);
95  // initialize class for decoding filters
96  $this->FilterDecoders = new TCPDF_FILTERS();
97  // get xref and trailer data
98  $this->xref = $this->getXrefData();
99  // parse all document objects
100  $this->objects = array();
101  foreach ($this->xref['xref'] as $obj => $offset) {
102  if (!isset($this->objects[$obj]) AND ($offset > 0)) {
103  // decode only objects with positive offset
104  $this->objects[$obj] = $this->getIndirectObject($obj, $offset, true);
105  }
106  }
107  // release some memory
108  unset($this->pdfdata);
109  $this->pdfdata = '';
110  }
111 
118  public function getParsedData() {
119  return array($this->xref, $this->objects);
120  }
121 
130  protected function getXrefData($offset=0, $xref=array()) {
131  if ($offset == 0) {
132  // find last startxref
133  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) {
134  $this->Error('Unable to find startxref');
135  }
136  $matches = array_pop($matches);
137  $startxref = $matches[1];
138  } else {
139  if (preg_match('/([0-9]+[\s][0-9]+[\s]obj)/i', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset)) {
140  // Cross-Reference Stream object
141  $startxref = $offset;
142  } elseif (preg_match('/[\r\n]startxref[\s]*[\r\n]+([0-9]+)[\s]*[\r\n]+%%EOF/i', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset)) {
143  // startxref found
144  $startxref = $matches[1][0];
145  } else {
146  $this->Error('Unable to find startxref');
147  }
148  }
149  // check xref position
150  if (strpos($this->pdfdata, 'xref', $startxref) == $startxref) {
151  // Cross-Reference
152  $xref = $this->decodeXref($startxref, $xref);
153  } else {
154  // Cross-Reference Stream
155  $xref = $this->decodeXrefStream($startxref, $xref);
156  }
157  if (empty($xref)) {
158  $this->Error('Unable to find xref');
159  }
160  return $xref;
161  }
162 
171  protected function decodeXref($startxref, $xref=array()) {
172  // extract xref data (object indexes and offsets)
173  $xoffset = $startxref + 5;
174  // initialize object number
175  $obj_num = 0;
176  $offset = $xoffset;
177  while (preg_match('/^([0-9]+)[\s]([0-9]+)[\s]?([nf]?)/im', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
178  $offset = (strlen($matches[0][0]) + $matches[0][1]);
179  if ($matches[3][0] == 'n') {
180  // create unique object index: [object number]_[generation number]
181  $index = $obj_num.'_'.intval($matches[2][0]);
182  // check if object already exist
183  if (!isset($xref['xref'][$index])) {
184  // store object offset position
185  $xref['xref'][$index] = intval($matches[1][0]);
186  }
187  ++$obj_num;
188  $offset += 2;
189  } elseif ($matches[3][0] == 'f') {
190  ++$obj_num;
191  $offset += 2;
192  } else {
193  // object number (index)
194  $obj_num = intval($matches[1][0]);
195  }
196  }
197  // get trailer data
198  if (preg_match('/trailer[\s]*<<(.*)>>[\s]*[\r\n]+startxref[\s]*[\r\n]+/isU', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $xoffset) > 0) {
199  $trailer_data = $matches[1][0];
200  if (!isset($xref['trailer']) OR empty($xref['trailer'])) {
201  // get only the last updated version
202  $xref['trailer'] = array();
203  // parse trailer_data
204  if (preg_match('/Size[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
205  $xref['trailer']['size'] = intval($matches[1]);
206  }
207  if (preg_match('/Root[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
208  $xref['trailer']['root'] = intval($matches[1]).'_'.intval($matches[2]);
209  }
210  if (preg_match('/Encrypt[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
211  $xref['trailer']['encrypt'] = intval($matches[1]).'_'.intval($matches[2]);
212  }
213  if (preg_match('/Info[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) {
214  $xref['trailer']['info'] = intval($matches[1]).'_'.intval($matches[2]);
215  }
216  if (preg_match('/ID[\s]*[\[][\s]*[<]([^>]*)[>][\s]*[<]([^>]*)[>]/i', $trailer_data, $matches) > 0) {
217  $xref['trailer']['id'] = array();
218  $xref['trailer']['id'][0] = $matches[1];
219  $xref['trailer']['id'][1] = $matches[2];
220  }
221  }
222  if (preg_match('/Prev[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) {
223  // get previous xref
224  $xref = $this->getXrefData(intval($matches[1]), $xref);
225  }
226  } else {
227  $this->Error('Unable to find trailer');
228  }
229  return $xref;
230  }
231 
240  protected function decodeXrefStream($startxref, $xref=array()) {
241  // try to read Cross-Reference Stream
242  $xrefobj = $this->getRawObject($startxref);
243  $xrefcrs = $this->getIndirectObject($xrefobj[1], $startxref, true);
244  if (!isset($xref['trailer']) OR empty($xref['trailer'])) {
245  // get only the last updated version
246  $xref['trailer'] = array();
247  $filltrailer = true;
248  } else {
249  $filltrailer = false;
250  }
251  $valid_crs = false;
252  $sarr = $xrefcrs[0][1];
253  foreach ($sarr as $k => $v) {
254  if (($v[0] == '/') AND ($v[1] == 'Type') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == '/') AND ($sarr[($k +1)][1] == 'XRef'))) {
255  $valid_crs = true;
256  } elseif (($v[0] == '/') AND ($v[1] == 'Index') AND (isset($sarr[($k +1)]))) {
257  // first object number in the subsection
258  $index_first = intval($sarr[($k +1)][1][0][1]);
259  // number of entries in the subsection
260  $index_entries = intval($sarr[($k +1)][1][1][1]);
261  } elseif (($v[0] == '/') AND ($v[1] == 'Prev') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) {
262  // get previous xref offset
263  $prevxref = intval($sarr[($k +1)][1]);
264  } elseif (($v[0] == '/') AND ($v[1] == 'W') AND (isset($sarr[($k +1)]))) {
265  // number of bytes (in the decoded stream) of the corresponding field
266  $wb = array();
267  $wb[0] = intval($sarr[($k +1)][1][0][1]);
268  $wb[1] = intval($sarr[($k +1)][1][1][1]);
269  $wb[2] = intval($sarr[($k +1)][1][2][1]);
270  } elseif (($v[0] == '/') AND ($v[1] == 'DecodeParms') AND (isset($sarr[($k +1)][1]))) {
271  $decpar = $sarr[($k +1)][1];
272  foreach ($decpar as $kdc => $vdc) {
273  if (($vdc[0] == '/') AND ($vdc[1] == 'Columns') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) {
274  $columns = intval($decpar[($kdc +1)][1]);
275  } elseif (($vdc[0] == '/') AND ($vdc[1] == 'Predictor') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) {
276  $predictor = intval($decpar[($kdc +1)][1]);
277  }
278  }
279  } elseif ($filltrailer) {
280  if (($v[0] == '/') AND ($v[1] == 'Size') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) {
281  $xref['trailer']['size'] = $sarr[($k +1)][1];
282  } elseif (($v[0] == '/') AND ($v[1] == 'Root') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'ojbref'))) {
283  $xref['trailer']['root'] = $sarr[($k +1)][1];
284  } elseif (($v[0] == '/') AND ($v[1] == 'Info') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'ojbref'))) {
285  $xref['trailer']['info'] = $sarr[($k +1)][1];
286  } elseif (($v[0] == '/') AND ($v[1] == 'ID') AND (isset($sarr[($k +1)]))) {
287  $xref['trailer']['id'] = array();
288  $xref['trailer']['id'][0] = $sarr[($k +1)][1][0][1];
289  $xref['trailer']['id'][1] = $sarr[($k +1)][1][1][1];
290  }
291  }
292  }
293  // decode data
294  if ($valid_crs AND isset($xrefcrs[1][3][0])) {
295  // number of bytes in a row
296  $rowlen = ($columns + 1);
297  // convert the stream into an array of integers
298  $sdata = unpack('C*', $xrefcrs[1][3][0]);
299  // split the rows
300  $sdata = array_chunk($sdata, $rowlen);
301  // initialize decoded array
302  $ddata = array();
303  // initialize first row with zeros
304  $prev_row = array_fill (0, $rowlen, 0);
305  // for each row apply PNG unpredictor
306  foreach ($sdata as $k => $row) {
307  // initialize new row
308  $ddata[$k] = array();
309  // get PNG predictor value
310  $predictor = (10 + $row[0]);
311  // for each byte on the row
312  for ($i=1; $i<=$columns; ++$i) {
313  // new index
314  $j = ($i - 1);
315  $row_up = $prev_row[$j];
316  if ($i == 1) {
317  $row_left = 0;
318  $row_upleft = 0;
319  } else {
320  $row_left = $row[($i - 1)];
321  $row_upleft = $prev_row[($j - 1)];
322  }
323  switch ($predictor) {
324  case 10: { // PNG prediction (on encoding, PNG None on all rows)
325  $ddata[$k][$j] = $row[$i];
326  break;
327  }
328  case 11: { // PNG prediction (on encoding, PNG Sub on all rows)
329  $ddata[$k][$j] = (($row[$i] + $row_left) & 0xff);
330  break;
331  }
332  case 12: { // PNG prediction (on encoding, PNG Up on all rows)
333  $ddata[$k][$j] = (($row[$i] + $row_up) & 0xff);
334  break;
335  }
336  case 13: { // PNG prediction (on encoding, PNG Average on all rows)
337  $ddata[$k][$j] = (($row[$i] + (($row_left + $row_up) / 2)) & 0xff);
338  break;
339  }
340  case 14: { // PNG prediction (on encoding, PNG Paeth on all rows)
341  // initial estimate
342  $p = ($row_left + $row_up - $row_upleft);
343  // distances
344  $pa = abs($p - $row_left);
345  $pb = abs($p - $row_up);
346  $pc = abs($p - $row_upleft);
347  $pmin = min($pa, $pb, $pc);
348  // return minumum distance
349  switch ($pmin) {
350  case $pa: {
351  $ddata[$k][$j] = (($row[$i] + $row_left) & 0xff);
352  break;
353  }
354  case $pb: {
355  $ddata[$k][$j] = (($row[$i] + $row_up) & 0xff);
356  break;
357  }
358  case $pc: {
359  $ddata[$k][$j] = (($row[$i] + $row_upleft) & 0xff);
360  break;
361  }
362  }
363  break;
364  }
365  default: { // PNG prediction (on encoding, PNG optimum)
366  $this->Error('Unknown PNG predictor');
367  break;
368  }
369  }
370  }
371  $prev_row = $ddata[$k];
372  } // end for each row
373  // complete decoding
374  $sdata = array();
375  // for every row
376  foreach ($ddata as $k => $row) {
377  // initialize new row
378  $sdata[$k] = array(0, 0, 0);
379  if ($wb[0] == 0) {
380  // default type field
381  $sdata[$k][0] = 1;
382  }
383  $i = 0; // count bytes on the row
384  // for every column
385  for ($c = 0; $c < 3; ++$c) {
386  // for every byte on the column
387  for ($b = 0; $b < $wb[$c]; ++$b) {
388  $sdata[$k][$c] += ($row[$i] << (($wb[$c] - 1 - $b) * 8));
389  ++$i;
390  }
391  }
392  }
393  $ddata = array();
394  // fill xref
395  if (isset($index_first)) {
396  $obj_num = $index_first;
397  } else {
398  $obj_num = 0;
399  }
400  foreach ($sdata as $k => $row) {
401  switch ($row[0]) {
402  case 0: { // (f) linked list of free objects
403  ++$obj_num;
404  break;
405  }
406  case 1: { // (n) objects that are in use but are not compressed
407  // create unique object index: [object number]_[generation number]
408  $index = $obj_num.'_'.$row[2];
409  // check if object already exist
410  if (!isset($xref['xref'][$index])) {
411  // store object offset position
412  $xref['xref'][$index] = $row[1];
413  }
414  ++$obj_num;
415  break;
416  }
417  case 2: { // compressed objects
418  // $row[1] = object number of the object stream in which this object is stored
419  // $row[2] = index of this object within the object stream
420  $index = $row[1].'_0_'.$row[2];
421  $xref['xref'][$index] = -1;
422  break;
423  }
424  default: { // null objects
425  break;
426  }
427  }
428  }
429  } // end decoding data
430  if (isset($prevxref)) {
431  // get previous xref
432  $xref = $this->getXrefData($prevxref, $xref);
433  }
434  return $xref;
435  }
436 
444  protected function getRawObject($offset=0) {
445  $objtype = ''; // object type to be returned
446  $objval = ''; // object value to be returned
447  // 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)
448  $offset += strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $offset);
449  // get first char
450  $char = $this->pdfdata{$offset};
451  // get object type
452  switch ($char) {
453  case '%': { // \x25 PERCENT SIGN
454  // skip comment and search for next token
455  $next = strcspn($this->pdfdata, "\r\n", $offset);
456  if ($next > 0) {
457  $offset += $next;
458  return $this->getRawObject($this->pdfdata, $offset);
459  }
460  break;
461  }
462  case '/': { // \x2F SOLIDUS
463  // name object
464  $objtype = $char;
465  ++$offset;
466  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) {
467  $objval = $matches[1]; // unescaped value
468  $offset += strlen($objval);
469  }
470  break;
471  }
472  case '(': // \x28 LEFT PARENTHESIS
473  case ')': { // \x29 RIGHT PARENTHESIS
474  // literal string object
475  $objtype = $char;
476  ++$offset;
477  $strpos = $offset;
478  if ($char == '(') {
479  $open_bracket = 1;
480  while ($open_bracket > 0) {
481  if (!isset($this->pdfdata{$strpos})) {
482  break;
483  }
484  $ch = $this->pdfdata{$strpos};
485  switch ($ch) {
486  case '\\': { // REVERSE SOLIDUS (5Ch) (Backslash)
487  // skip next character
488  ++$strpos;
489  break;
490  }
491  case '(': { // LEFT PARENHESIS (28h)
492  ++$open_bracket;
493  break;
494  }
495  case ')': { // RIGHT PARENTHESIS (29h)
496  --$open_bracket;
497  break;
498  }
499  }
500  ++$strpos;
501  }
502  $objval = substr($this->pdfdata, $offset, ($strpos - $offset - 1));
503  $offset = $strpos;
504  }
505  break;
506  }
507  case '[': // \x5B LEFT SQUARE BRACKET
508  case ']': { // \x5D RIGHT SQUARE BRACKET
509  // array object
510  $objtype = $char;
511  ++$offset;
512  if ($char == '[') {
513  // get array content
514  $objval = array();
515  do {
516  // get element
517  $element = $this->getRawObject($offset);
518  $offset = $element[2];
519  $objval[] = $element;
520  } while ($element[0] != ']');
521  // remove closing delimiter
522  array_pop($objval);
523  }
524  break;
525  }
526  case '<': // \x3C LESS-THAN SIGN
527  case '>': { // \x3E GREATER-THAN SIGN
528  if (isset($this->pdfdata{($offset + 1)}) AND ($this->pdfdata{($offset + 1)} == $char)) {
529  // dictionary object
530  $objtype = $char.$char;
531  $offset += 2;
532  if ($char == '<') {
533  // get array content
534  $objval = array();
535  do {
536  // get element
537  $element = $this->getRawObject($offset);
538  $offset = $element[2];
539  $objval[] = $element;
540  } while ($element[0] != '>>');
541  // remove closing delimiter
542  array_pop($objval);
543  }
544  } else {
545  // hexadecimal string object
546  $objtype = $char;
547  ++$offset;
548  if (($char == '<') AND (preg_match('/^([0-9A-Fa-f]+)[>]/iU', substr($this->pdfdata, $offset), $matches) == 1)) {
549  $objval = $matches[1];
550  $offset += strlen($matches[0]);
551  }
552  }
553  break;
554  }
555  default: {
556  if (substr($this->pdfdata, $offset, 6) == 'endobj') {
557  // indirect object
558  $objtype = 'endobj';
559  $offset += 6;
560  } elseif (substr($this->pdfdata, $offset, 4) == 'null') {
561  // null object
562  $objtype = 'null';
563  $offset += 4;
564  $objval = 'null';
565  } elseif (substr($this->pdfdata, $offset, 4) == 'true') {
566  // boolean true object
567  $objtype = 'boolean';
568  $offset += 4;
569  $objval = 'true';
570  } elseif (substr($this->pdfdata, $offset, 5) == 'false') {
571  // boolean false object
572  $objtype = 'boolean';
573  $offset += 5;
574  $objval = 'false';
575  } elseif (substr($this->pdfdata, $offset, 6) == 'stream') {
576  // start stream object
577  $objtype = 'stream';
578  $offset += 6;
579  if (preg_match('/^([\r\n]+)/isU', substr($this->pdfdata, $offset), $matches) == 1) {
580  $offset += strlen($matches[0]);
581  }
582  if (preg_match('/([\r\n]*endstream)/isU', substr($this->pdfdata, $offset), $matches, PREG_OFFSET_CAPTURE) == 1) {
583  $objval = substr($this->pdfdata, $offset, $matches[0][1]);
584  $offset += $matches[0][1];
585  }
586  } elseif (substr($this->pdfdata, $offset, 9) == 'endstream') {
587  // end stream object
588  $objtype = 'endstream';
589  $offset += 9;
590  } elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+R/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
591  // indirect object reference
592  $objtype = 'ojbref';
593  $offset += strlen($matches[0]);
594  $objval = intval($matches[1]).'_'.intval($matches[2]);
595  } elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+obj/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
596  // object start
597  $objtype = 'ojb';
598  $objval = intval($matches[1]).'_'.intval($matches[2]);
599  $offset += strlen ($matches[0]);
600  } elseif (($numlen = strspn($this->pdfdata, '+-.0123456789', $offset)) > 0) {
601  // numeric object
602  $objtype = 'numeric';
603  $objval = substr($this->pdfdata, $offset, $numlen);
604  $offset += $numlen;
605  }
606  break;
607  }
608  }
609  return array($objtype, $objval, $offset);
610  }
611 
621  protected function getIndirectObject($obj_ref, $offset=0, $decoding=true) {
622  $obj = explode('_', $obj_ref);
623  if (($obj === false) OR (count($obj) != 2)) {
624  $this->Error('Invalid object reference: '.$obj);
625  return;
626  }
627  $objref = $obj[0].' '.$obj[1].' obj';
628  if (strpos($this->pdfdata, $objref, $offset) != $offset) {
629  // an indirect reference to an undefined object shall be considered a reference to the null object
630  return array('null', 'null', $offset);
631  }
632  // starting position of object content
633  $offset += strlen($objref);
634  // get array of object content
635  $objdata = array();
636  $i = 0; // object main index
637  do {
638  // get element
639  $element = $this->getRawObject($offset);
640  $offset = $element[2];
641  // decode stream using stream's dictionary information
642  if ($decoding AND ($element[0] == 'stream') AND (isset($objdata[($i - 1)][0])) AND ($objdata[($i - 1)][0] == '<<')) {
643  $element[3] = $this->decodeStream($objdata[($i - 1)][1], substr($element[1], 1));
644  }
645  $objdata[$i] = $element;
646  ++$i;
647  } while ($element[0] != 'endobj');
648  // remove closing delimiter
649  array_pop($objdata);
650  // return raw object content
651  return $objdata;
652  }
653 
661  protected function getObjectVal($obj) {
662  if ($obj[0] == 'objref') {
663  // reference to indirect object
664  if (isset($this->objects[$obj[1]])) {
665  // this object has been already parsed
666  return $this->objects[$obj[1]];
667  } elseif (isset($this->xref[$obj[1]])) {
668  // parse new object
669  $this->objects[$obj[1]] = $this->getIndirectObject($obj[1], $this->xref[$obj[1]], false);
670  return $this->objects[$obj[1]];
671  }
672  }
673  return $obj;
674  }
675 
684  protected function decodeStream($sdic, $stream) {
685  // get stream lenght and filters
686  $slength = strlen($stream);
687  if ($slength <= 0) {
688  return array('', array());
689  }
690  $filters = array();
691  foreach ($sdic as $k => $v) {
692  if ($v[0] == '/') {
693  if (($v[1] == 'Length') AND (isset($sdic[($k + 1)])) AND ($sdic[($k + 1)][0] == 'numeric')) {
694  // get declared stream lenght
695  $declength = intval($sdic[($k + 1)][1]);
696  if ($declength < $slength) {
697  $stream = substr($stream, 0, $declength);
698  $slength = $declength;
699  }
700  } elseif (($v[1] == 'Filter') AND (isset($sdic[($k + 1)]))) {
701  // resolve indirect object
702  $objval = $this->getObjectVal($sdic[($k + 1)]);
703  if ($objval[0] == '/') {
704  // single filter
705  $filters[] = $objval[1];
706  } elseif ($objval[0] == '[') {
707  // array of filters
708  foreach ($objval[1] as $flt) {
709  if ($flt[0] == '/') {
710  $filters[] = $flt[1];
711  }
712  }
713  }
714  }
715  }
716  }
717  // decode the stream
718  $remaining_filters = array();
719  foreach ($filters as $filter) {
720  if (in_array($filter, $this->FilterDecoders->getAvailableFilters())) {
721  $stream = $this->FilterDecoders->decodeFilter($filter, $stream);
722  } else {
723  // add missing filter to array
724  $remaining_filters[] = $filter;
725  }
726  }
727  return array($stream, $remaining_filters);
728  }
729 
736  public function Error($msg) {
737  // exit program and print error
738  die('<strong>TCPDF_PARSER ERROR: </strong>'.$msg);
739  }
740 
741 } // END OF TCPDF_PARSER CLASS
742 
743 //============================================================+
744 // END OF FILE
745 //============================================================+