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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 - [email protected] 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 44 require_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 - [email protected] 53 */ 54 class 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 //============================================================+
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| Generated: Fri Nov 28 20:29:05 2014 | Cross-referenced by PHPXref 0.7.1 |