| 1 |
<?php |
| 2 |
// |
| 3 |
// FPDI - Version 1.4.2 |
| 4 |
// |
| 5 |
// Copyright 2004-2011 Setasign - Jan Slabon |
| 6 |
// |
| 7 |
// Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 |
// you may not use this file except in compliance with the License. |
| 9 |
// You may obtain a copy of the License at |
| 10 |
// |
| 11 |
// http://www.apache.org/licenses/LICENSE-2.0 |
| 12 |
// |
| 13 |
// Unless required by applicable law or agreed to in writing, software |
| 14 |
// distributed under the License is distributed on an "AS IS" BASIS, |
| 15 |
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 |
// See the License for the specific language governing permissions and |
| 17 |
// limitations under the License. |
| 18 |
// |
| 19 |
|
| 20 |
if (!defined ('PDF_TYPE_NULL')) |
| 21 |
define ('PDF_TYPE_NULL', 0); |
| 22 |
if (!defined ('PDF_TYPE_NUMERIC')) |
| 23 |
define ('PDF_TYPE_NUMERIC', 1); |
| 24 |
if (!defined ('PDF_TYPE_TOKEN')) |
| 25 |
define ('PDF_TYPE_TOKEN', 2); |
| 26 |
if (!defined ('PDF_TYPE_HEX')) |
| 27 |
define ('PDF_TYPE_HEX', 3); |
| 28 |
if (!defined ('PDF_TYPE_STRING')) |
| 29 |
define ('PDF_TYPE_STRING', 4); |
| 30 |
if (!defined ('PDF_TYPE_DICTIONARY')) |
| 31 |
define ('PDF_TYPE_DICTIONARY', 5); |
| 32 |
if (!defined ('PDF_TYPE_ARRAY')) |
| 33 |
define ('PDF_TYPE_ARRAY', 6); |
| 34 |
if (!defined ('PDF_TYPE_OBJDEC')) |
| 35 |
define ('PDF_TYPE_OBJDEC', 7); |
| 36 |
if (!defined ('PDF_TYPE_OBJREF')) |
| 37 |
define ('PDF_TYPE_OBJREF', 8); |
| 38 |
if (!defined ('PDF_TYPE_OBJECT')) |
| 39 |
define ('PDF_TYPE_OBJECT', 9); |
| 40 |
if (!defined ('PDF_TYPE_STREAM')) |
| 41 |
define ('PDF_TYPE_STREAM', 10); |
| 42 |
if (!defined ('PDF_TYPE_BOOLEAN')) |
| 43 |
define ('PDF_TYPE_BOOLEAN', 11); |
| 44 |
if (!defined ('PDF_TYPE_REAL')) |
| 45 |
define ('PDF_TYPE_REAL', 12); |
| 46 |
|
| 47 |
require_once( USCES_PLUGIN_DIR . '/pdf/fpdi/pdf_context.php'); |
| 48 |
|
| 49 |
if (!class_exists('pdf_parser', false)) { |
| 50 |
|
| 51 |
class pdf_parser { |
| 52 |
|
| 53 |
/** |
| 54 |
* Filename |
| 55 |
* @var string |
| 56 |
*/ |
| 57 |
var $filename; |
| 58 |
|
| 59 |
/** |
| 60 |
* File resource |
| 61 |
* @var resource |
| 62 |
*/ |
| 63 |
var $f; |
| 64 |
|
| 65 |
/** |
| 66 |
* PDF Context |
| 67 |
* @var object pdf_context-Instance |
| 68 |
*/ |
| 69 |
var $c; |
| 70 |
|
| 71 |
/** |
| 72 |
* xref-Data |
| 73 |
* @var array |
| 74 |
*/ |
| 75 |
var $xref; |
| 76 |
|
| 77 |
/** |
| 78 |
* root-Object |
| 79 |
* @var array |
| 80 |
*/ |
| 81 |
var $root; |
| 82 |
|
| 83 |
/** |
| 84 |
* PDF version of the loaded document |
| 85 |
* @var string |
| 86 |
*/ |
| 87 |
var $pdfVersion; |
| 88 |
|
| 89 |
/** |
| 90 |
* For reading encrypted documents and xref/objectstreams are in use |
| 91 |
* |
| 92 |
* @var boolean |
| 93 |
*/ |
| 94 |
var $readPlain = true; |
| 95 |
|
| 96 |
/** |
| 97 |
* Constructor |
| 98 |
* |
| 99 |
* @param string $filename Source-Filename |
| 100 |
*/ |
| 101 |
function pdf_parser($filename) { |
| 102 |
$this->filename = $filename; |
| 103 |
|
| 104 |
$this->f = @fopen($this->filename, 'rb'); |
| 105 |
|
| 106 |
if (!$this->f) |
| 107 |
$this->error(sprintf('Cannot open %s !', $filename)); |
| 108 |
|
| 109 |
$this->getPDFVersion(); |
| 110 |
|
| 111 |
$this->c = new pdf_context($this->f); |
| 112 |
|
| 113 |
// Read xref-Data |
| 114 |
$this->xref = array(); |
| 115 |
$this->pdf_read_xref($this->xref, $this->pdf_find_xref()); |
| 116 |
|
| 117 |
// Check for Encryption |
| 118 |
$this->getEncryption(); |
| 119 |
|
| 120 |
// Read root |
| 121 |
$this->pdf_read_root(); |
| 122 |
} |
| 123 |
|
| 124 |
/** |
| 125 |
* Close the opened file |
| 126 |
*/ |
| 127 |
function closeFile() { |
| 128 |
if (isset($this->f) && is_resource($this->f)) { |
| 129 |
fclose($this->f); |
| 130 |
unset($this->f); |
| 131 |
} |
| 132 |
} |
| 133 |
|
| 134 |
/** |
| 135 |
* Print Error and die |
| 136 |
* |
| 137 |
* @param string $msg Error-Message |
| 138 |
*/ |
| 139 |
function error($msg) { |
| 140 |
die('<b>PDF-Parser Error:</b> ' . $msg); |
| 141 |
} |
| 142 |
|
| 143 |
/** |
| 144 |
* Check Trailer for Encryption |
| 145 |
*/ |
| 146 |
function getEncryption() { |
| 147 |
if (isset($this->xref['trailer'][1]['/Encrypt'])) { |
| 148 |
$this->error('File is encrypted!'); |
| 149 |
} |
| 150 |
} |
| 151 |
|
| 152 |
/** |
| 153 |
* Find/Return /Root |
| 154 |
* |
| 155 |
* @return array |
| 156 |
*/ |
| 157 |
function pdf_find_root() { |
| 158 |
if ($this->xref['trailer'][1]['/Root'][0] != PDF_TYPE_OBJREF) { |
| 159 |
$this->error('Wrong Type of Root-Element! Must be an indirect reference'); |
| 160 |
} |
| 161 |
|
| 162 |
return $this->xref['trailer'][1]['/Root']; |
| 163 |
} |
| 164 |
|
| 165 |
/** |
| 166 |
* Read the /Root |
| 167 |
*/ |
| 168 |
function pdf_read_root() { |
| 169 |
// read root |
| 170 |
$this->root = $this->pdf_resolve_object($this->c, $this->pdf_find_root()); |
| 171 |
} |
| 172 |
|
| 173 |
/** |
| 174 |
* Get PDF-Version |
| 175 |
* |
| 176 |
* And reset the PDF Version used in FPDI if needed |
| 177 |
*/ |
| 178 |
function getPDFVersion() { |
| 179 |
fseek($this->f, 0); |
| 180 |
preg_match('/\d\.\d/',fread($this->f, 16), $m); |
| 181 |
if (isset($m[0])) |
| 182 |
$this->pdfVersion = $m[0]; |
| 183 |
return $this->pdfVersion; |
| 184 |
} |
| 185 |
|
| 186 |
/** |
| 187 |
* Find the xref-Table |
| 188 |
*/ |
| 189 |
function pdf_find_xref() { |
| 190 |
$toRead = 1500; |
| 191 |
|
| 192 |
$stat = fseek ($this->f, -$toRead, SEEK_END); |
| 193 |
if ($stat === -1) { |
| 194 |
fseek ($this->f, 0); |
| 195 |
} |
| 196 |
$data = fread($this->f, $toRead); |
| 197 |
|
| 198 |
$pos = strlen($data) - strpos(strrev($data), strrev('startxref')); |
| 199 |
$data = substr($data, $pos); |
| 200 |
|
| 201 |
if (!preg_match('/\s*(\d+).*$/s', $data, $matches)) { |
| 202 |
$this->error('Unable to find pointer to xref table'); |
| 203 |
} |
| 204 |
|
| 205 |
return (int) $matches[1]; |
| 206 |
} |
| 207 |
|
| 208 |
/** |
| 209 |
* Read xref-table |
| 210 |
* |
| 211 |
* @param array $result Array of xref-table |
| 212 |
* @param integer $offset of xref-table |
| 213 |
*/ |
| 214 |
function pdf_read_xref(&$result, $offset) { |
| 215 |
$o_pos = $offset-min(20, $offset); |
| 216 |
fseek($this->f, $o_pos); // set some bytes backwards to fetch errorious docs |
| 217 |
|
| 218 |
$data = fread($this->f, 100); |
| 219 |
|
| 220 |
$xrefPos = strrpos($data, 'xref'); |
| 221 |
|
| 222 |
if ($xrefPos === false) { |
| 223 |
fseek($this->f, $offset); |
| 224 |
$c = new pdf_context($this->f); |
| 225 |
$xrefStreamObjDec = $this->pdf_read_value($c); |
| 226 |
|
| 227 |
if (is_array($xrefStreamObjDec) && isset($xrefStreamObjDec[0]) && $xrefStreamObjDec[0] == PDF_TYPE_OBJDEC) { |
| 228 |
$this->error(sprintf('This document (%s) probably uses a compression technique which is not supported by the free parser shipped with FPDI.', $this->filename)); |
| 229 |
} else { |
| 230 |
$this->error('Unable to find xref table.'); |
| 231 |
} |
| 232 |
} |
| 233 |
|
| 234 |
if (!isset($result['xref_location'])) { |
| 235 |
$result['xref_location'] = $o_pos + $xrefPos; |
| 236 |
$result['max_object'] = 0; |
| 237 |
} |
| 238 |
|
| 239 |
$cylces = -1; |
| 240 |
$bytesPerCycle = 100; |
| 241 |
|
| 242 |
fseek($this->f, $o_pos = $o_pos + $xrefPos + 4); // set the handle directly after the "xref"-keyword |
| 243 |
$data = fread($this->f, $bytesPerCycle); |
| 244 |
|
| 245 |
while (($trailerPos = strpos($data, 'trailer', max($bytesPerCycle * $cylces++, 0))) === false && !feof($this->f)) { |
| 246 |
$data .= fread($this->f, $bytesPerCycle); |
| 247 |
} |
| 248 |
|
| 249 |
if ($trailerPos === false) { |
| 250 |
$this->error('Trailer keyword not found after xref table'); |
| 251 |
} |
| 252 |
|
| 253 |
$data = substr($data, 0, $trailerPos); |
| 254 |
|
| 255 |
// get Line-Ending |
| 256 |
preg_match_all("/(\r\n|\n|\r)/", substr($data, 0, 100), $m); // check the first 100 bytes for linebreaks |
| 257 |
|
| 258 |
$differentLineEndings = count(array_unique($m[0])); |
| 259 |
if ($differentLineEndings > 1) { |
| 260 |
$lines = preg_split("/(\r\n|\n|\r)/", $data, -1, PREG_SPLIT_NO_EMPTY); |
| 261 |
} else { |
| 262 |
$lines = explode($m[0][1], $data); |
| 263 |
} |
| 264 |
|
| 265 |
$data = $differentLineEndings = $m = null; |
| 266 |
unset($data, $differentLineEndings, $m); |
| 267 |
|
| 268 |
$linesCount = count($lines); |
| 269 |
|
| 270 |
$start = 1; |
| 271 |
|
| 272 |
for ($i = 0; $i < $linesCount; $i++) { |
| 273 |
$line = trim($lines[$i]); |
| 274 |
if ($line) { |
| 275 |
$pieces = explode(' ', $line); |
| 276 |
$c = count($pieces); |
| 277 |
switch($c) { |
| 278 |
case 2: |
| 279 |
$start = (int)$pieces[0]; |
| 280 |
$end = $start + (int)$pieces[1]; |
| 281 |
if ($end > $result['max_object']) |
| 282 |
$result['max_object'] = $end; |
| 283 |
break; |
| 284 |
case 3: |
| 285 |
if (!isset($result['xref'][$start])) |
| 286 |
$result['xref'][$start] = array(); |
| 287 |
|
| 288 |
if (!array_key_exists($gen = (int) $pieces[1], $result['xref'][$start])) { |
| 289 |
$result['xref'][$start][$gen] = $pieces[2] == 'n' ? (int) $pieces[0] : null; |
| 290 |
} |
| 291 |
$start++; |
| 292 |
break; |
| 293 |
default: |
| 294 |
$this->error('Unexpected data in xref table'); |
| 295 |
} |
| 296 |
} |
| 297 |
} |
| 298 |
|
| 299 |
$lines = $pieces = $line = $start = $end = $gen = null; |
| 300 |
unset($lines, $pieces, $line, $start, $end, $gen); |
| 301 |
|
| 302 |
fseek($this->f, $o_pos + $trailerPos + 7); |
| 303 |
|
| 304 |
$c = new pdf_context($this->f); |
| 305 |
$trailer = $this->pdf_read_value($c); |
| 306 |
|
| 307 |
$c = null; |
| 308 |
unset($c); |
| 309 |
|
| 310 |
if (!isset($result['trailer'])) { |
| 311 |
$result['trailer'] = $trailer; |
| 312 |
} |
| 313 |
|
| 314 |
if (isset($trailer[1]['/Prev'])) { |
| 315 |
$this->pdf_read_xref($result, $trailer[1]['/Prev'][1]); |
| 316 |
} |
| 317 |
|
| 318 |
$trailer = null; |
| 319 |
unset($trailer); |
| 320 |
|
| 321 |
return true; |
| 322 |
} |
| 323 |
|
| 324 |
/** |
| 325 |
* Reads an Value |
| 326 |
* |
| 327 |
* @param object $c pdf_context |
| 328 |
* @param string $token a Token |
| 329 |
* @return mixed |
| 330 |
*/ |
| 331 |
function pdf_read_value(&$c, $token = null) { |
| 332 |
if (is_null($token)) { |
| 333 |
$token = $this->pdf_read_token($c); |
| 334 |
} |
| 335 |
|
| 336 |
if ($token === false) { |
| 337 |
return false; |
| 338 |
} |
| 339 |
|
| 340 |
switch ($token) { |
| 341 |
case '<': |
| 342 |
// This is a hex string. |
| 343 |
// Read the value, then the terminator |
| 344 |
|
| 345 |
$pos = $c->offset; |
| 346 |
|
| 347 |
while(1) { |
| 348 |
|
| 349 |
$match = strpos ($c->buffer, '>', $pos); |
| 350 |
|
| 351 |
// If you can't find it, try |
| 352 |
// reading more data from the stream |
| 353 |
|
| 354 |
if ($match === false) { |
| 355 |
if (!$c->increase_length()) { |
| 356 |
return false; |
| 357 |
} else { |
| 358 |
continue; |
| 359 |
} |
| 360 |
} |
| 361 |
|
| 362 |
$result = substr ($c->buffer, $c->offset, $match - $c->offset); |
| 363 |
$c->offset = $match + 1; |
| 364 |
|
| 365 |
return array (PDF_TYPE_HEX, $result); |
| 366 |
} |
| 367 |
|
| 368 |
break; |
| 369 |
case '<<': |
| 370 |
// This is a dictionary. |
| 371 |
|
| 372 |
$result = array(); |
| 373 |
|
| 374 |
// Recurse into this function until we reach |
| 375 |
// the end of the dictionary. |
| 376 |
while (($key = $this->pdf_read_token($c)) !== '>>') { |
| 377 |
if ($key === false) { |
| 378 |
return false; |
| 379 |
} |
| 380 |
|
| 381 |
if (($value = $this->pdf_read_value($c)) === false) { |
| 382 |
return false; |
| 383 |
} |
| 384 |
|
| 385 |
// Catch missing value |
| 386 |
if ($value[0] == PDF_TYPE_TOKEN && $value[1] == '>>') { |
| 387 |
$result[$key] = array(PDF_TYPE_NULL); |
| 388 |
break; |
| 389 |
} |
| 390 |
|
| 391 |
$result[$key] = $value; |
| 392 |
} |
| 393 |
|
| 394 |
return array (PDF_TYPE_DICTIONARY, $result); |
| 395 |
|
| 396 |
case '[': |
| 397 |
// This is an array. |
| 398 |
|
| 399 |
$result = array(); |
| 400 |
|
| 401 |
// Recurse into this function until we reach |
| 402 |
// the end of the array. |
| 403 |
while (($token = $this->pdf_read_token($c)) !== ']') { |
| 404 |
if ($token === false) { |
| 405 |
return false; |
| 406 |
} |
| 407 |
|
| 408 |
if (($value = $this->pdf_read_value($c, $token)) === false) { |
| 409 |
return false; |
| 410 |
} |
| 411 |
|
| 412 |
$result[] = $value; |
| 413 |
} |
| 414 |
|
| 415 |
return array (PDF_TYPE_ARRAY, $result); |
| 416 |
|
| 417 |
case '(' : |
| 418 |
// This is a string |
| 419 |
$pos = $c->offset; |
| 420 |
|
| 421 |
$openBrackets = 1; |
| 422 |
do { |
| 423 |
for (; $openBrackets != 0 && $pos < $c->length; $pos++) { |
| 424 |
switch (ord($c->buffer[$pos])) { |
| 425 |
case 0x28: // '(' |
| 426 |
$openBrackets++; |
| 427 |
break; |
| 428 |
case 0x29: // ')' |
| 429 |
$openBrackets--; |
| 430 |
break; |
| 431 |
case 0x5C: // backslash |
| 432 |
$pos++; |
| 433 |
} |
| 434 |
} |
| 435 |
} while($openBrackets != 0 && $c->increase_length()); |
| 436 |
|
| 437 |
$result = substr($c->buffer, $c->offset, $pos - $c->offset - 1); |
| 438 |
$c->offset = $pos; |
| 439 |
|
| 440 |
return array (PDF_TYPE_STRING, $result); |
| 441 |
|
| 442 |
case 'stream': |
| 443 |
$o_pos = ftell($c->file)-strlen($c->buffer); |
| 444 |
$o_offset = $c->offset; |
| 445 |
|
| 446 |
$c->reset($startpos = $o_pos + $o_offset); |
| 447 |
|
| 448 |
$e = 0; // ensure line breaks in front of the stream |
| 449 |
if ($c->buffer[0] == chr(10) || $c->buffer[0] == chr(13)) |
| 450 |
$e++; |
| 451 |
if ($c->buffer[1] == chr(10) && $c->buffer[0] != chr(10)) |
| 452 |
$e++; |
| 453 |
|
| 454 |
if ($this->actual_obj[1][1]['/Length'][0] == PDF_TYPE_OBJREF) { |
| 455 |
$tmp_c = new pdf_context($this->f); |
| 456 |
$tmp_length = $this->pdf_resolve_object($tmp_c, $this->actual_obj[1][1]['/Length']); |
| 457 |
$length = $tmp_length[1][1]; |
| 458 |
} else { |
| 459 |
$length = $this->actual_obj[1][1]['/Length'][1]; |
| 460 |
} |
| 461 |
|
| 462 |
if ($length > 0) { |
| 463 |
$c->reset($startpos + $e,$length); |
| 464 |
$v = $c->buffer; |
| 465 |
} else { |
| 466 |
$v = ''; |
| 467 |
} |
| 468 |
$c->reset($startpos + $e + $length + 9); // 9 = strlen("endstream") |
| 469 |
|
| 470 |
return array(PDF_TYPE_STREAM, $v); |
| 471 |
|
| 472 |
default : |
| 473 |
if (is_numeric ($token)) { |
| 474 |
// A numeric token. Make sure that |
| 475 |
// it is not part of something else. |
| 476 |
if (($tok2 = $this->pdf_read_token ($c)) !== false) { |
| 477 |
if (is_numeric ($tok2)) { |
| 478 |
|
| 479 |
// Two numeric tokens in a row. |
| 480 |
// In this case, we're probably in |
| 481 |
// front of either an object reference |
| 482 |
// or an object specification. |
| 483 |
// Determine the case and return the data |
| 484 |
if (($tok3 = $this->pdf_read_token ($c)) !== false) { |
| 485 |
switch ($tok3) { |
| 486 |
case 'obj': |
| 487 |
return array (PDF_TYPE_OBJDEC, (int) $token, (int) $tok2); |
| 488 |
case 'R': |
| 489 |
return array (PDF_TYPE_OBJREF, (int) $token, (int) $tok2); |
| 490 |
} |
| 491 |
// If we get to this point, that numeric value up |
| 492 |
// there was just a numeric value. Push the extra |
| 493 |
// tokens back into the stack and return the value. |
| 494 |
array_push ($c->stack, $tok3); |
| 495 |
} |
| 496 |
} |
| 497 |
|
| 498 |
array_push ($c->stack, $tok2); |
| 499 |
} |
| 500 |
|
| 501 |
if ($token === (string)((int)$token)) |
| 502 |
return array (PDF_TYPE_NUMERIC, (int)$token); |
| 503 |
else |
| 504 |
return array (PDF_TYPE_REAL, (float)$token); |
| 505 |
} else if ($token == 'true' || $token == 'false') { |
| 506 |
return array (PDF_TYPE_BOOLEAN, $token == 'true'); |
| 507 |
} else if ($token == 'null') { |
| 508 |
return array (PDF_TYPE_NULL); |
| 509 |
} else { |
| 510 |
// Just a token. Return it. |
| 511 |
return array (PDF_TYPE_TOKEN, $token); |
| 512 |
} |
| 513 |
} |
| 514 |
} |
| 515 |
|
| 516 |
/** |
| 517 |
* Resolve an object |
| 518 |
* |
| 519 |
* @param object $c pdf_context |
| 520 |
* @param array $obj_spec The object-data |
| 521 |
* @param boolean $encapsulate Must set to true, cause the parsing and fpdi use this method only without this para |
| 522 |
*/ |
| 523 |
function pdf_resolve_object(&$c, $obj_spec, $encapsulate = true) { |
| 524 |
// Exit if we get invalid data |
| 525 |
if (!is_array($obj_spec)) { |
| 526 |
$ret = false; |
| 527 |
return $ret; |
| 528 |
} |
| 529 |
|
| 530 |
if ($obj_spec[0] == PDF_TYPE_OBJREF) { |
| 531 |
|
| 532 |
// This is a reference, resolve it |
| 533 |
if (isset($this->xref['xref'][$obj_spec[1]][$obj_spec[2]])) { |
| 534 |
|
| 535 |
// Save current file position |
| 536 |
// This is needed if you want to resolve |
| 537 |
// references while you're reading another object |
| 538 |
// (e.g.: if you need to determine the length |
| 539 |
// of a stream) |
| 540 |
|
| 541 |
$old_pos = ftell($c->file); |
| 542 |
|
| 543 |
// Reposition the file pointer and |
| 544 |
// load the object header. |
| 545 |
|
| 546 |
$c->reset($this->xref['xref'][$obj_spec[1]][$obj_spec[2]]); |
| 547 |
|
| 548 |
$header = $this->pdf_read_value($c); |
| 549 |
|
| 550 |
if ($header[0] != PDF_TYPE_OBJDEC || $header[1] != $obj_spec[1] || $header[2] != $obj_spec[2]) { |
| 551 |
$toSearchFor = $obj_spec[1] . ' ' . $obj_spec[2] . ' obj'; |
| 552 |
if (preg_match('/' . $toSearchFor . '/', $c->buffer)) { |
| 553 |
$c->offset = strpos($c->buffer, $toSearchFor) + strlen($toSearchFor); |
| 554 |
// reset stack |
| 555 |
$c->stack = array(); |
| 556 |
} else { |
| 557 |
$this->error("Unable to find object ({$obj_spec[1]}, {$obj_spec[2]}) at expected location"); |
| 558 |
} |
| 559 |
} |
| 560 |
|
| 561 |
// If we're being asked to store all the information |
| 562 |
// about the object, we add the object ID and generation |
| 563 |
// number for later use |
| 564 |
$result = array(); |
| 565 |
$this->actual_obj =& $result; |
| 566 |
if ($encapsulate) { |
| 567 |
$result = array ( |
| 568 |
PDF_TYPE_OBJECT, |
| 569 |
'obj' => $obj_spec[1], |
| 570 |
'gen' => $obj_spec[2] |
| 571 |
); |
| 572 |
} |
| 573 |
|
| 574 |
// Now simply read the object data until |
| 575 |
// we encounter an end-of-object marker |
| 576 |
while(1) { |
| 577 |
$value = $this->pdf_read_value($c); |
| 578 |
if ($value === false || count($result) > 4) { |
| 579 |
// in this case the parser coudn't find an endobj so we break here |
| 580 |
break; |
| 581 |
} |
| 582 |
|
| 583 |
if ($value[0] == PDF_TYPE_TOKEN && $value[1] === 'endobj') { |
| 584 |
break; |
| 585 |
} |
| 586 |
|
| 587 |
$result[] = $value; |
| 588 |
} |
| 589 |
|
| 590 |
$c->reset($old_pos); |
| 591 |
|
| 592 |
if (isset($result[2][0]) && $result[2][0] == PDF_TYPE_STREAM) { |
| 593 |
$result[0] = PDF_TYPE_STREAM; |
| 594 |
} |
| 595 |
|
| 596 |
return $result; |
| 597 |
} |
| 598 |
} else { |
| 599 |
return $obj_spec; |
| 600 |
} |
| 601 |
} |
| 602 |
|
| 603 |
|
| 604 |
|
| 605 |
/** |
| 606 |
* Reads a token from the file |
| 607 |
* |
| 608 |
* @param object $c pdf_context |
| 609 |
* @return mixed |
| 610 |
*/ |
| 611 |
function pdf_read_token(&$c) |
| 612 |
{ |
| 613 |
// If there is a token available |
| 614 |
// on the stack, pop it out and |
| 615 |
// return it. |
| 616 |
|
| 617 |
if (count($c->stack)) { |
| 618 |
return array_pop($c->stack); |
| 619 |
} |
| 620 |
|
| 621 |
// Strip away any whitespace |
| 622 |
|
| 623 |
do { |
| 624 |
if (!$c->ensure_content()) { |
| 625 |
return false; |
| 626 |
} |
| 627 |
$c->offset += strspn($c->buffer, " \n\r\t", $c->offset); |
| 628 |
} while ($c->offset >= $c->length - 1); |
| 629 |
|
| 630 |
// Get the first character in the stream |
| 631 |
|
| 632 |
$char = $c->buffer[$c->offset++]; |
| 633 |
|
| 634 |
switch ($char) { |
| 635 |
|
| 636 |
case '[': |
| 637 |
case ']': |
| 638 |
case '(': |
| 639 |
case ')': |
| 640 |
|
| 641 |
// This is either an array or literal string |
| 642 |
// delimiter, Return it |
| 643 |
|
| 644 |
return $char; |
| 645 |
|
| 646 |
case '<': |
| 647 |
case '>': |
| 648 |
|
| 649 |
// This could either be a hex string or |
| 650 |
// dictionary delimiter. Determine the |
| 651 |
// appropriate case and return the token |
| 652 |
|
| 653 |
if ($c->buffer[$c->offset] == $char) { |
| 654 |
if (!$c->ensure_content()) { |
| 655 |
return false; |
| 656 |
} |
| 657 |
$c->offset++; |
| 658 |
return $char . $char; |
| 659 |
} else { |
| 660 |
return $char; |
| 661 |
} |
| 662 |
|
| 663 |
case '%': |
| 664 |
|
| 665 |
// This is a comment - jump over it! |
| 666 |
|
| 667 |
$pos = $c->offset; |
| 668 |
while(1) { |
| 669 |
$match = preg_match("/(\r\n|\r|\n)/", $c->buffer, $m, PREG_OFFSET_CAPTURE, $pos); |
| 670 |
if ($match === 0) { |
| 671 |
if (!$c->increase_length()) { |
| 672 |
return false; |
| 673 |
} else { |
| 674 |
continue; |
| 675 |
} |
| 676 |
} |
| 677 |
|
| 678 |
$c->offset = $m[0][1]+strlen($m[0][0]); |
| 679 |
|
| 680 |
return $this->pdf_read_token($c); |
| 681 |
} |
| 682 |
|
| 683 |
default: |
| 684 |
|
| 685 |
// This is "another" type of token (probably |
| 686 |
// a dictionary entry or a numeric value) |
| 687 |
// Find the end and return it. |
| 688 |
|
| 689 |
if (!$c->ensure_content()) { |
| 690 |
return false; |
| 691 |
} |
| 692 |
|
| 693 |
while(1) { |
| 694 |
|
| 695 |
// Determine the length of the token |
| 696 |
|
| 697 |
$pos = strcspn($c->buffer, " %[]<>()\r\n\t/", $c->offset); |
| 698 |
|
| 699 |
if ($c->offset + $pos <= $c->length - 1) { |
| 700 |
break; |
| 701 |
} else { |
| 702 |
// If the script reaches this point, |
| 703 |
// the token may span beyond the end |
| 704 |
// of the current buffer. Therefore, |
| 705 |
// we increase the size of the buffer |
| 706 |
// and try again--just to be safe. |
| 707 |
|
| 708 |
$c->increase_length(); |
| 709 |
} |
| 710 |
} |
| 711 |
|
| 712 |
$result = substr($c->buffer, $c->offset - 1, $pos + 1); |
| 713 |
|
| 714 |
$c->offset += $pos; |
| 715 |
return $result; |
| 716 |
} |
| 717 |
} |
| 718 |
} |
| 719 |
} |
| 720 |
|
