| @@ -1,501 +1,815 @@ | ||
| 1 | -<?php | |
| 2 | -//============================================================+ | |
| 3 | -// File name : tcpdf_parser.php | |
| 4 | -// Version : 1.0.000 | |
| 5 | -// Begin : 2011-05-23 | |
| 6 | -// Last Update : 2012-01-28 | |
| 7 | -// Author : Nicola Asuni - Tecnick.com LTD - Manor Coach House, Church Hill, Aldershot, Hants, GU12 4RQ, UK - www.tecnick.com - info@tecnick.com | |
| 8 | -// License : http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT GNU-LGPLv3 | |
| 9 | -// ------------------------------------------------------------------- | |
| 10 | -// Copyright (C) 2011-2012 Nicola Asuni - Tecnick.com LTD | |
| 11 | -// | |
| 12 | -// This file is part of TCPDF software library. | |
| 13 | -// | |
| 14 | -// TCPDF is free software: you can redistribute it and/or modify it | |
| 15 | -// under the terms of the GNU Lesser General Public License as | |
| 16 | -// published by the Free Software Foundation, either version 3 of the | |
| 17 | -// License, or (at your option) any later version. | |
| 18 | -// | |
| 19 | -// TCPDF is distributed in the hope that it will be useful, but | |
| 20 | -// WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 21 | -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| 22 | -// See the GNU Lesser General Public License for more details. | |
| 23 | -// | |
| 24 | -// You should have received a copy of the 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 1.0.000 | |
| 41 | - */ | |
| 42 | - | |
| 43 | -// include class for decoding filters | |
| 44 | -require_once(dirname(__FILE__).'/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 1.0.000 | |
| 52 | - * @author Nicola Asuni - info@tecnick.com | |
| 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 | - | |
| 82 | - /** | |
| 83 | - * Parse a PDF document an return an array of objects. | |
| 84 | - * @param $data (string) PDF data to parse. | |
| 85 | - * @public | |
| 86 | - * @since 1.0.000 (2011-05-24) | |
| 87 | - */ | |
| 88 | - public function __construct($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])) { | |
| 103 | - $this->objects[$obj] = $this->getIndirectObject($obj, $offset, true); | |
| 104 | - } | |
| 105 | - } | |
| 106 | - // release some memory | |
| 107 | - unset($this->pdfdata); | |
| 108 | - $this->pdfdata = ''; | |
| 109 | - } | |
| 110 | - | |
| 111 | - /** | |
| 112 | - * Return an array of parsed PDF document objects. | |
| 113 | - * @return (array) Array of parsed PDF document objects. | |
| 114 | - * @public | |
| 115 | - * @since 1.0.000 (2011-06-26) | |
| 116 | - */ | |
| 117 | - public function getParsedData() { | |
| 118 | - return array($this->xref, $this->objects); | |
| 119 | - } | |
| 120 | - | |
| 121 | - /** | |
| 122 | - * Get xref (cross-reference table) and trailer data from PDF document data. | |
| 123 | - * @param $offset (int) xref offset (if know). | |
| 124 | - * @param $xref (array) previous xref array (if any). | |
| 125 | - * @return Array containing xref and trailer data. | |
| 126 | - * @protected | |
| 127 | - * @since 1.0.000 (2011-05-24) | |
| 128 | - */ | |
| 129 | - protected function getXrefData($offset=0, $xref=array()) { | |
| 130 | - // find last startxref | |
| 131 | - 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) { | |
| 132 | - $this->Error('Unable to find startxref'); | |
| 133 | - } | |
| 134 | - $matches = array_pop($matches); | |
| 135 | - $startxref = $matches[1]; | |
| 136 | - // check xref position | |
| 137 | - if (strpos($this->pdfdata, 'xref', $startxref) != $startxref) { | |
| 138 | - $this->Error('Unable to find xref'); | |
| 139 | - } | |
| 140 | - // extract xref data (object indexes and offsets) | |
| 141 | - $offset = $startxref + 5; | |
| 142 | - // initialize object number | |
| 143 | - $obj_num = 0; | |
| 144 | - while (preg_match('/^([0-9]+)[\s]([0-9]+)[\s]?([nf]?)/im', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) { | |
| 145 | - $offset = (strlen($matches[0][0]) + $matches[0][1]); | |
| 146 | - if ($matches[3][0] == 'n') { | |
| 147 | - // create unique object index: [object number]_[generation number] | |
| 148 | - $index = $obj_num.'_'.intval($matches[2][0]); | |
| 149 | - // check if object already exist | |
| 150 | - if (!isset($xref['xref'][$index])) { | |
| 151 | - // store object offset position | |
| 152 | - $xref['xref'][$index] = intval($matches[1][0]); | |
| 153 | - } | |
| 154 | - ++$obj_num; | |
| 155 | - $offset += 2; | |
| 156 | - } elseif ($matches[3][0] == 'f') { | |
| 157 | - ++$obj_num; | |
| 158 | - $offset += 2; | |
| 159 | - } else { | |
| 160 | - // object number (index) | |
| 161 | - $obj_num = intval($matches[1][0]); | |
| 162 | - } | |
| 163 | - } | |
| 164 | - // get trailer data | |
| 165 | - if (preg_match('/trailer[\s]*<<(.*)>>[\s]*[\r\n]+startxref[\s]*[\r\n]+/isU', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) { | |
| 166 | - $trailer_data = $matches[1][0]; | |
| 167 | - if (!isset($xref['trailer'])) { | |
| 168 | - // get only the last updated version | |
| 169 | - $xref['trailer'] = array(); | |
| 170 | - // parse trailer_data | |
| 171 | - if (preg_match('/Size[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) { | |
| 172 | - $xref['trailer']['size'] = intval($matches[1]); | |
| 173 | - } | |
| 174 | - if (preg_match('/Root[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) { | |
| 175 | - $xref['trailer']['root'] = intval($matches[1]).'_'.intval($matches[2]); | |
| 176 | - } | |
| 177 | - if (preg_match('/Encrypt[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) { | |
| 178 | - $xref['trailer']['encrypt'] = intval($matches[1]).'_'.intval($matches[2]); | |
| 179 | - } | |
| 180 | - if (preg_match('/Info[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) { | |
| 181 | - $xref['trailer']['info'] = intval($matches[1]).'_'.intval($matches[2]); | |
| 182 | - } | |
| 183 | - if (preg_match('/ID[\s]*[\[][\s]*[<]([^>]*)[>][\s]*[<]([^>]*)[>]/i', $trailer_data, $matches) > 0) { | |
| 184 | - $xref['trailer']['id'] = array(); | |
| 185 | - $xref['trailer']['id'][0] = $matches[1]; | |
| 186 | - $xref['trailer']['id'][1] = $matches[2]; | |
| 187 | - } | |
| 188 | - } | |
| 189 | - if (preg_match('/Prev[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) { | |
| 190 | - // get previous xref | |
| 191 | - $xref = getXrefData(substr($this->pdfdata, 0, $startxref), intval($matches[1]), $xref); | |
| 192 | - } | |
| 193 | - } else { | |
| 194 | - $this->Error('Unable to find trailer'); | |
| 195 | - } | |
| 196 | - return $xref; | |
| 197 | - } | |
| 198 | - | |
| 199 | - /** | |
| 200 | - * Get object type, raw value and offset to next object | |
| 201 | - * @param $offset (int) Object offset. | |
| 202 | - * @return array containing object type, raw value and offset to next object | |
| 203 | - * @protected | |
| 204 | - * @since 1.0.000 (2011-06-20) | |
| 205 | - */ | |
| 206 | - protected function getRawObject($offset=0) { | |
| 207 | - $objtype = ''; // object type to be returned | |
| 208 | - $objval = ''; // object value to be returned | |
| 209 | - // 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) | |
| 210 | - $offset += strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $offset); | |
| 211 | - // get first char | |
| 212 | - $char = $this->pdfdata{$offset}; | |
| 213 | - // get object type | |
| 214 | - switch ($char) { | |
| 215 | - case '%': { // \x25 PERCENT SIGN | |
| 216 | - // skip comment and search for next token | |
| 217 | - $next = strcspn($this->pdfdata, "\r\n", $offset); | |
| 218 | - if ($next > 0) { | |
| 219 | - $offset += $next; | |
| 220 | - return $this->getRawObject($this->pdfdata, $offset); | |
| 221 | - } | |
| 222 | - break; | |
| 223 | - } | |
| 224 | - case '/': { // \x2F SOLIDUS | |
| 225 | - // name object | |
| 226 | - $objtype = $char; | |
| 227 | - ++$offset; | |
| 228 | - 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) { | |
| 229 | - $objval = $matches[1]; // unescaped value | |
| 230 | - $offset += strlen($objval); | |
| 231 | - } | |
| 232 | - break; | |
| 233 | - } | |
| 234 | - case '(': // \x28 LEFT PARENTHESIS | |
| 235 | - case ')': { // \x29 RIGHT PARENTHESIS | |
| 236 | - // literal string object | |
| 237 | - $objtype = $char; | |
| 238 | - ++$offset; | |
| 239 | - $strpos = $offset; | |
| 240 | - if ($char == '(') { | |
| 241 | - $open_bracket = 1; | |
| 242 | - while ($open_bracket > 0) { | |
| 243 | - if (!isset($this->pdfdata{$strpos})) { | |
| 244 | - break; | |
| 245 | - } | |
| 246 | - $ch = $this->pdfdata{$strpos}; | |
| 247 | - switch ($ch) { | |
| 248 | - case '\\': { // REVERSE SOLIDUS (5Ch) (Backslash) | |
| 249 | - // skip next character | |
| 250 | - ++$strpos; | |
| 251 | - break; | |
| 252 | - } | |
| 253 | - case '(': { // LEFT PARENHESIS (28h) | |
| 254 | - ++$open_bracket; | |
| 255 | - break; | |
| 256 | - } | |
| 257 | - case ')': { // RIGHT PARENTHESIS (29h) | |
| 258 | - --$open_bracket; | |
| 259 | - break; | |
| 260 | - } | |
| 261 | - } | |
| 262 | - ++$strpos; | |
| 263 | - } | |
| 264 | - $objval = substr($this->pdfdata, $offset, ($strpos - $offset - 1)); | |
| 265 | - $offset = $strpos; | |
| 266 | - } | |
| 267 | - break; | |
| 268 | - } | |
| 269 | - case '[': // \x5B LEFT SQUARE BRACKET | |
| 270 | - case ']': { // \x5D RIGHT SQUARE BRACKET | |
| 271 | - // array object | |
| 272 | - $objtype = $char; | |
| 273 | - ++$offset; | |
| 274 | - if ($char == '[') { | |
| 275 | - // get array content | |
| 276 | - $objval = array(); | |
| 277 | - do { | |
| 278 | - // get element | |
| 279 | - $element = $this->getRawObject($offset); | |
| 280 | - $offset = $element[2]; | |
| 281 | - $objval[] = $element; | |
| 282 | - } while ($element[0] != ']'); | |
| 283 | - // remove closing delimiter | |
| 284 | - array_pop($objval); | |
| 285 | - } | |
| 286 | - break; | |
| 287 | - } | |
| 288 | - case '<': // \x3C LESS-THAN SIGN | |
| 289 | - case '>': { // \x3E GREATER-THAN SIGN | |
| 290 | - if (isset($this->pdfdata{($offset + 1)}) AND ($this->pdfdata{($offset + 1)} == $char)) { | |
| 291 | - // dictionary object | |
| 292 | - $objtype = $char.$char; | |
| 293 | - $offset += 2; | |
| 294 | - if ($char == '<') { | |
| 295 | - // get array content | |
| 296 | - $objval = array(); | |
| 297 | - do { | |
| 298 | - // get element | |
| 299 | - $element = $this->getRawObject($offset); | |
| 300 | - $offset = $element[2]; | |
| 301 | - $objval[] = $element; | |
| 302 | - } while ($element[0] != '>>'); | |
| 303 | - // remove closing delimiter | |
| 304 | - array_pop($objval); | |
| 305 | - } | |
| 306 | - } else { | |
| 307 | - // hexadecimal string object | |
| 308 | - $objtype = $char; | |
| 309 | - ++$offset; | |
| 310 | - if (($char == '<') AND (preg_match('/^([0-9A-Fa-f]+)[>]/iU', substr($this->pdfdata, $offset), $matches) == 1)) { | |
| 311 | - $objval = $matches[1]; | |
| 312 | - $offset += strlen($matches[0]); | |
| 313 | - } | |
| 314 | - } | |
| 315 | - break; | |
| 316 | - } | |
| 317 | - default: { | |
| 318 | - if (substr($this->pdfdata, $offset, 6) == 'endobj') { | |
| 319 | - // indirect object | |
| 320 | - $objtype = 'endobj'; | |
| 321 | - $offset += 6; | |
| 322 | - } elseif (substr($this->pdfdata, $offset, 4) == 'null') { | |
| 323 | - // null object | |
| 324 | - $objtype = 'null'; | |
| 325 | - $offset += 4; | |
| 326 | - $objval = 'null'; | |
| 327 | - } elseif (substr($this->pdfdata, $offset, 4) == 'true') { | |
| 328 | - // boolean true object | |
| 329 | - $objtype = 'boolean'; | |
| 330 | - $offset += 4; | |
| 331 | - $objval = 'true'; | |
| 332 | - } elseif (substr($this->pdfdata, $offset, 5) == 'false') { | |
| 333 | - // boolean false object | |
| 334 | - $objtype = 'boolean'; | |
| 335 | - $offset += 5; | |
| 336 | - $objval = 'false'; | |
| 337 | - } elseif (substr($this->pdfdata, $offset, 6) == 'stream') { | |
| 338 | - // start stream object | |
| 339 | - $objtype = 'stream'; | |
| 340 | - $offset += 6; | |
| 341 | - if (preg_match('/^[\r\n]+(.*)[\r\n]*endstream/isU', substr($this->pdfdata, $offset), $matches) == 1) { | |
| 342 | - $objval = $matches[1]; | |
| 343 | - $offset += strlen($matches[0]); | |
| 344 | - } | |
| 345 | - } elseif (substr($this->pdfdata, $offset, 9) == 'endstream') { | |
| 346 | - // end stream object | |
| 347 | - $objtype = 'endstream'; | |
| 348 | - $offset += 9; | |
| 349 | - } elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+R/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) { | |
| 350 | - // indirect object reference | |
| 351 | - $objtype = 'ojbref'; | |
| 352 | - $offset += strlen($matches[0]); | |
| 353 | - $objval = intval($matches[1]).'_'.intval($matches[2]); | |
| 354 | - } elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+obj/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) { | |
| 355 | - // object start | |
| 356 | - $objtype = 'ojb'; | |
| 357 | - $objval = intval($matches[1]).'_'.intval($matches[2]); | |
| 358 | - $offset += strlen ($matches[0]); | |
| 359 | - } elseif (($numlen = strspn($this->pdfdata, '+-.0123456789', $offset)) > 0) { | |
| 360 | - // numeric object | |
| 361 | - $objtype = 'numeric'; | |
| 362 | - $objval = substr($this->pdfdata, $offset, $numlen); | |
| 363 | - $offset += $numlen; | |
| 364 | - } | |
| 365 | - break; | |
| 366 | - } | |
| 367 | - } | |
| 368 | - return array($objtype, $objval, $offset); | |
| 369 | - } | |
| 370 | - | |
| 371 | - /** | |
| 372 | - * Get content of indirect object. | |
| 373 | - * @param $obj_ref (string) Object number and generation number separated by underscore character. | |
| 374 | - * @param $offset (int) Object offset. | |
| 375 | - * @param $decoding (boolean) If true decode streams. | |
| 376 | - * @return array containing object data. | |
| 377 | - * @protected | |
| 378 | - * @since 1.0.000 (2011-05-24) | |
| 379 | - */ | |
| 380 | - protected function getIndirectObject($obj_ref, $offset=0, $decoding=true) { | |
| 381 | - $obj = explode('_', $obj_ref); | |
| 382 | - if (($obj === false) OR (count($obj) != 2)) { | |
| 383 | - $this->Error('Invalid object reference: '.$obj); | |
| 384 | - return; | |
| 385 | - } | |
| 386 | - $objref = $obj[0].' '.$obj[1].' obj'; | |
| 387 | - if (strpos($this->pdfdata, $objref, $offset) != $offset) { | |
| 388 | - // an indirect reference to an undefined object shall be considered a reference to the null object | |
| 389 | - return array('null', 'null', $offset); | |
| 390 | - } | |
| 391 | - // starting position of object content | |
| 392 | - $offset += strlen($objref); | |
| 393 | - // get array of object content | |
| 394 | - $objdata = array(); | |
| 395 | - $i = 0; // object main index | |
| 396 | - do { | |
| 397 | - // get element | |
| 398 | - $element = $this->getRawObject($offset); | |
| 399 | - $offset = $element[2]; | |
| 400 | - // decode stream using stream's dictionary information | |
| 401 | - if ($decoding AND ($element[0] == 'stream') AND (isset($objdata[($i - 1)][0])) AND ($objdata[($i - 1)][0] == '<<')) { | |
| 402 | - $element[3] = $this->decodeStream($objdata[($i - 1)][1], $element[1]); | |
| 403 | - } | |
| 404 | - $objdata[$i] = $element; | |
| 405 | - ++$i; | |
| 406 | - } while ($element[0] != 'endobj'); | |
| 407 | - // remove closing delimiter | |
| 408 | - array_pop($objdata); | |
| 409 | - // return raw object content | |
| 410 | - return $objdata; | |
| 411 | - } | |
| 412 | - | |
| 413 | - /** | |
| 414 | - * Get the content of object, resolving indect object reference if necessary. | |
| 415 | - * @param $obj (string) Object value. | |
| 416 | - * @return array containing object data. | |
| 417 | - * @protected | |
| 418 | - * @since 1.0.000 (2011-06-26) | |
| 419 | - */ | |
| 420 | - protected function getObjectVal($obj) { | |
| 421 | - if ($obj[0] == 'objref') { | |
| 422 | - // reference to indirect object | |
| 423 | - if (isset($this->objects[$obj[1]])) { | |
| 424 | - // this object has been already parsed | |
| 425 | - return $this->objects[$obj[1]]; | |
| 426 | - } elseif (isset($this->xref[$obj[1]])) { | |
| 427 | - // parse new object | |
| 428 | - $this->objects[$obj[1]] = $this->getIndirectObject($obj[1], $this->xref[$obj[1]], false); | |
| 429 | - return $this->objects[$obj[1]]; | |
| 430 | - } | |
| 431 | - } | |
| 432 | - return $obj; | |
| 433 | - } | |
| 434 | - | |
| 435 | - /** | |
| 436 | - * Decode the specified stream. | |
| 437 | - * @param $sdic (array) Stream's dictionary array. | |
| 438 | - * @param $stream (string) Stream to decode. | |
| 439 | - * @return array containing decoded stream data and remaining filters. | |
| 440 | - * @protected | |
| 441 | - * @since 1.0.000 (2011-06-22) | |
| 442 | - */ | |
| 443 | - protected function decodeStream($sdic, $stream) { | |
| 444 | - // get stream lenght and filters | |
| 445 | - $slength = strlen($stream); | |
| 446 | - $filters = array(); | |
| 447 | - foreach ($sdic as $k => $v) { | |
| 448 | - if ($v[0] == '/') { | |
| 449 | - if (($v[1] == 'Length') AND (isset($sdic[($k + 1)])) AND ($sdic[($k + 1)][0] == 'numeric')) { | |
| 450 | - // get declared stream lenght | |
| 451 | - $declength = intval($sdic[($k + 1)][1]); | |
| 452 | - if ($declength < $slength) { | |
| 453 | - $stream = substr($stream, 0, $declength); | |
| 454 | - $slength = $declength; | |
| 455 | - } | |
| 456 | - } elseif (($v[1] == 'Filter') AND (isset($sdic[($k + 1)]))) { | |
| 457 | - // resolve indirect object | |
| 458 | - $objval = $this->getObjectVal($sdic[($k + 1)]); | |
| 459 | - if ($objval[0] == '/') { | |
| 460 | - // single filter | |
| 461 | - $filters[] = $objval[1]; | |
| 462 | - } elseif ($objval[0] == '[') { | |
| 463 | - // array of filters | |
| 464 | - foreach ($objval[1] as $flt) { | |
| 465 | - if ($flt[0] == '/') { | |
| 466 | - $filters[] = $flt[1]; | |
| 467 | - } | |
| 468 | - } | |
| 469 | - } | |
| 470 | - } | |
| 471 | - } | |
| 472 | - } | |
| 473 | - // decode the stream | |
| 474 | - $remaining_filters = array(); | |
| 475 | - foreach ($filters as $filter) { | |
| 476 | - if (in_array($filter, $this->FilterDecoders->getAvailableFilters())) { | |
| 477 | - $stream = $this->FilterDecoders->decodeFilter($filter, $stream); | |
| 478 | - } else { | |
| 479 | - // add missing filter to array | |
| 480 | - $remaining_filters[] = $filter; | |
| 481 | - } | |
| 482 | - } | |
| 483 | - return array($stream, $remaining_filters); | |
| 484 | - } | |
| 485 | - | |
| 486 | - /** | |
| 487 | - * This method is automatically called in case of fatal error; it simply outputs the message and halts the execution. | |
| 488 | - * @param $msg (string) The error message | |
| 489 | - * @public | |
| 490 | - * @since 1.0.000 (2011-05-23) | |
| 491 | - */ | |
| 492 | - public function Error($msg) { | |
| 493 | - // exit program and print error | |
| 494 | - die('<strong>TCPDF_PARSER ERROR: </strong>'.$msg); | |
| 495 | - } | |
| 496 | - | |
| 497 | -} // END OF TCPDF_PARSER CLASS | |
| 498 | - | |
| 499 | -//============================================================+ | |
| 500 | -// END OF FILE | |
| 501 | -//============================================================+ | |
| 1 | +<?php | |
| 2 | +//============================================================+ | |
| 3 | +// File name : tcpdf_parser.php | |
| 4 | +// Version : 1.0.16 | |
| 5 | +// Begin : 2011-05-23 | |
| 6 | +// Last Update : 2015-04-28 | |
| 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) 2011-2015 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 1.0.15 | |
| 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 1.0.15 | |
| 52 | + * @author Nicola Asuni - info@tecnick.com | |
| 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 length 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 = $xrefcrs[0][1]; | |
| 300 | + if (!is_array($sarr)) { | |
| 301 | + $sarr = array(); | |
| 302 | + } | |
| 303 | + foreach ($sarr as $k => $v) { | |
| 304 | + if (($v[0] == '/') AND ($v[1] == 'Type') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == '/') AND ($sarr[($k +1)][1] == 'XRef'))) { | |
| 305 | + $valid_crs = true; | |
| 306 | + } elseif (($v[0] == '/') AND ($v[1] == 'Index') AND (isset($sarr[($k +1)]))) { | |
| 307 | + // first object number in the subsection | |
| 308 | + $index_first = intval($sarr[($k +1)][1][0][1]); | |
| 309 | + // number of entries in the subsection | |
| 310 | + $index_entries = intval($sarr[($k +1)][1][1][1]); | |
| 311 | + } elseif (($v[0] == '/') AND ($v[1] == 'Prev') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) { | |
| 312 | + // get previous xref offset | |
| 313 | + $prevxref = intval($sarr[($k +1)][1]); | |
| 314 | + } elseif (($v[0] == '/') AND ($v[1] == 'W') AND (isset($sarr[($k +1)]))) { | |
| 315 | + // number of bytes (in the decoded stream) of the corresponding field | |
| 316 | + $wb = array(); | |
| 317 | + $wb[0] = intval($sarr[($k +1)][1][0][1]); | |
| 318 | + $wb[1] = intval($sarr[($k +1)][1][1][1]); | |
| 319 | + $wb[2] = intval($sarr[($k +1)][1][2][1]); | |
| 320 | + } elseif (($v[0] == '/') AND ($v[1] == 'DecodeParms') AND (isset($sarr[($k +1)][1]))) { | |
| 321 | + $decpar = $sarr[($k +1)][1]; | |
| 322 | + foreach ($decpar as $kdc => $vdc) { | |
| 323 | + if (($vdc[0] == '/') AND ($vdc[1] == 'Columns') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) { | |
| 324 | + $columns = intval($decpar[($kdc +1)][1]); | |
| 325 | + } elseif (($vdc[0] == '/') AND ($vdc[1] == 'Predictor') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) { | |
| 326 | + $predictor = intval($decpar[($kdc +1)][1]); | |
| 327 | + } | |
| 328 | + } | |
| 329 | + } elseif ($filltrailer) { | |
| 330 | + if (($v[0] == '/') AND ($v[1] == 'Size') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) { | |
| 331 | + $xref['trailer']['size'] = $sarr[($k +1)][1]; | |
| 332 | + } elseif (($v[0] == '/') AND ($v[1] == 'Root') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) { | |
| 333 | + $xref['trailer']['root'] = $sarr[($k +1)][1]; | |
| 334 | + } elseif (($v[0] == '/') AND ($v[1] == 'Info') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) { | |
| 335 | + $xref['trailer']['info'] = $sarr[($k +1)][1]; | |
| 336 | + } elseif (($v[0] == '/') AND ($v[1] == 'Encrypt') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) { | |
| 337 | + $xref['trailer']['encrypt'] = $sarr[($k +1)][1]; | |
| 338 | + } elseif (($v[0] == '/') AND ($v[1] == 'ID') AND (isset($sarr[($k +1)]))) { | |
| 339 | + $xref['trailer']['id'] = array(); | |
| 340 | + $xref['trailer']['id'][0] = $sarr[($k +1)][1][0][1]; | |
| 341 | + $xref['trailer']['id'][1] = $sarr[($k +1)][1][1][1]; | |
| 342 | + } | |
| 343 | + } | |
| 344 | + } | |
| 345 | + // decode data | |
| 346 | + if ($valid_crs AND isset($xrefcrs[1][3][0])) { | |
| 347 | + // number of bytes in a row | |
| 348 | + $rowlen = ($columns + 1); | |
| 349 | + // convert the stream into an array of integers | |
| 350 | + $sdata = unpack('C*', $xrefcrs[1][3][0]); | |
| 351 | + // split the rows | |
| 352 | + $sdata = array_chunk($sdata, $rowlen); | |
| 353 | + // initialize decoded array | |
| 354 | + $ddata = array(); | |
| 355 | + // initialize first row with zeros | |
| 356 | + $prev_row = array_fill (0, $rowlen, 0); | |
| 357 | + // for each row apply PNG unpredictor | |
| 358 | + foreach ($sdata as $k => $row) { | |
| 359 | + // initialize new row | |
| 360 | + $ddata[$k] = array(); | |
| 361 | + // get PNG predictor value | |
| 362 | + $predictor = (10 + $row[0]); | |
| 363 | + // for each byte on the row | |
| 364 | + for ($i=1; $i<=$columns; ++$i) { | |
| 365 | + // new index | |
| 366 | + $j = ($i - 1); | |
| 367 | + $row_up = $prev_row[$j]; | |
| 368 | + if ($i == 1) { | |
| 369 | + $row_left = 0; | |
| 370 | + $row_upleft = 0; | |
| 371 | + } else { | |
| 372 | + $row_left = $row[($i - 1)]; | |
| 373 | + $row_upleft = $prev_row[($j - 1)]; | |
| 374 | + } | |
| 375 | + switch ($predictor) { | |
| 376 | + case 10: { // PNG prediction (on encoding, PNG None on all rows) | |
| 377 | + $ddata[$k][$j] = $row[$i]; | |
| 378 | + break; | |
| 379 | + } | |
| 380 | + case 11: { // PNG prediction (on encoding, PNG Sub on all rows) | |
| 381 | + $ddata[$k][$j] = (($row[$i] + $row_left) & 0xff); | |
| 382 | + break; | |
| 383 | + } | |
| 384 | + case 12: { // PNG prediction (on encoding, PNG Up on all rows) | |
| 385 | + $ddata[$k][$j] = (($row[$i] + $row_up) & 0xff); | |
| 386 | + break; | |
| 387 | + } | |
| 388 | + case 13: { // PNG prediction (on encoding, PNG Average on all rows) | |
| 389 | + $ddata[$k][$j] = (($row[$i] + (($row_left + $row_up) / 2)) & 0xff); | |
| 390 | + break; | |
| 391 | + } | |
| 392 | + case 14: { // PNG prediction (on encoding, PNG Paeth on all rows) | |
| 393 | + // initial estimate | |
| 394 | + $p = ($row_left + $row_up - $row_upleft); | |
| 395 | + // distances | |
| 396 | + $pa = abs($p - $row_left); | |
| 397 | + $pb = abs($p - $row_up); | |
| 398 | + $pc = abs($p - $row_upleft); | |
| 399 | + $pmin = min($pa, $pb, $pc); | |
| 400 | + // return minimum distance | |
| 401 | + switch ($pmin) { | |
| 402 | + case $pa: { | |
| 403 | + $ddata[$k][$j] = (($row[$i] + $row_left) & 0xff); | |
| 404 | + break; | |
| 405 | + } | |
| 406 | + case $pb: { | |
| 407 | + $ddata[$k][$j] = (($row[$i] + $row_up) & 0xff); | |
| 408 | + break; | |
| 409 | + } | |
| 410 | + case $pc: { | |
| 411 | + $ddata[$k][$j] = (($row[$i] + $row_upleft) & 0xff); | |
| 412 | + break; | |
| 413 | + } | |
| 414 | + } | |
| 415 | + break; | |
| 416 | + } | |
| 417 | + default: { // PNG prediction (on encoding, PNG optimum) | |
| 418 | + $this->Error('Unknown PNG predictor'); | |
| 419 | + break; | |
| 420 | + } | |
| 421 | + } | |
| 422 | + } | |
| 423 | + $prev_row = $ddata[$k]; | |
| 424 | + } // end for each row | |
| 425 | + // complete decoding | |
| 426 | + $sdata = array(); | |
| 427 | + // for every row | |
| 428 | + foreach ($ddata as $k => $row) { | |
| 429 | + // initialize new row | |
| 430 | + $sdata[$k] = array(0, 0, 0); | |
| 431 | + if ($wb[0] == 0) { | |
| 432 | + // default type field | |
| 433 | + $sdata[$k][0] = 1; | |
| 434 | + } | |
| 435 | + $i = 0; // count bytes in the row | |
| 436 | + // for every column | |
| 437 | + for ($c = 0; $c < 3; ++$c) { | |
| 438 | + // for every byte on the column | |
| 439 | + for ($b = 0; $b < $wb[$c]; ++$b) { | |
| 440 | + if (isset($row[$i])) { | |
| 441 | + $sdata[$k][$c] += ($row[$i] << (($wb[$c] - 1 - $b) * 8)); | |
| 442 | + } | |
| 443 | + ++$i; | |
| 444 | + } | |
| 445 | + } | |
| 446 | + } | |
| 447 | + $ddata = array(); | |
| 448 | + // fill xref | |
| 449 | + if (isset($index_first)) { | |
| 450 | + $obj_num = $index_first; | |
| 451 | + } else { | |
| 452 | + $obj_num = 0; | |
| 453 | + } | |
| 454 | + foreach ($sdata as $k => $row) { | |
| 455 | + switch ($row[0]) { | |
| 456 | + case 0: { // (f) linked list of free objects | |
| 457 | + break; | |
| 458 | + } | |
| 459 | + case 1: { // (n) objects that are in use but are not compressed | |
| 460 | + // create unique object index: [object number]_[generation number] | |
| 461 | + $index = $obj_num.'_'.$row[2]; | |
| 462 | + // check if object already exist | |
| 463 | + if (!isset($xref['xref'][$index])) { | |
| 464 | + // store object offset position | |
| 465 | + $xref['xref'][$index] = $row[1]; | |
| 466 | + } | |
| 467 | + break; | |
| 468 | + } | |
| 469 | + case 2: { // compressed objects | |
| 470 | + // $row[1] = object number of the object stream in which this object is stored | |
| 471 | + // $row[2] = index of this object within the object stream | |
| 472 | + $index = $row[1].'_0_'.$row[2]; | |
| 473 | + $xref['xref'][$index] = -1; | |
| 474 | + break; | |
| 475 | + } | |
| 476 | + default: { // null objects | |
| 477 | + break; | |
| 478 | + } | |
| 479 | + } | |
| 480 | + ++$obj_num; | |
| 481 | + } | |
| 482 | + } // end decoding data | |
| 483 | + if (isset($prevxref)) { | |
| 484 | + // get previous xref | |
| 485 | + $xref = $this->getXrefData($prevxref, $xref); | |
| 486 | + } | |
| 487 | + return $xref; | |
| 488 | + } | |
| 489 | + | |
| 490 | + /** | |
| 491 | + * Get object type, raw value and offset to next object | |
| 492 | + * @param $offset (int) Object offset. | |
| 493 | + * @return array containing object type, raw value and offset to next object | |
| 494 | + * @protected | |
| 495 | + * @since 1.0.000 (2011-06-20) | |
| 496 | + */ | |
| 497 | + protected function getRawObject($offset=0) { | |
| 498 | + $objtype = ''; // object type to be returned | |
| 499 | + $objval = ''; // object value to be returned | |
| 500 | + // 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) | |
| 501 | + $offset += strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $offset); | |
| 502 | + // get first char | |
| 503 | + $char = $this->pdfdata[$offset]; | |
| 504 | + // get object type | |
| 505 | + switch ($char) { | |
| 506 | + case '%': { // \x25 PERCENT SIGN | |
| 507 | + // skip comment and search for next token | |
| 508 | + $next = strcspn($this->pdfdata, "\r\n", $offset); | |
| 509 | + if ($next > 0) { | |
| 510 | + $offset += $next; | |
| 511 | + return $this->getRawObject($offset); | |
| 512 | + } | |
| 513 | + break; | |
| 514 | + } | |
| 515 | + case '/': { // \x2F SOLIDUS | |
| 516 | + // name object | |
| 517 | + $objtype = $char; | |
| 518 | + ++$offset; | |
| 519 | + 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) { | |
| 520 | + $objval = $matches[1]; // unescaped value | |
| 521 | + $offset += strlen($objval); | |
| 522 | + } | |
| 523 | + break; | |
| 524 | + } | |
| 525 | + case '(': // \x28 LEFT PARENTHESIS | |
| 526 | + case ')': { // \x29 RIGHT PARENTHESIS | |
| 527 | + // literal string object | |
| 528 | + $objtype = $char; | |
| 529 | + ++$offset; | |
| 530 | + $strpos = $offset; | |
| 531 | + if ($char == '(') { | |
| 532 | + $open_bracket = 1; | |
| 533 | + while ($open_bracket > 0) { | |
| 534 | + if (!isset($this->pdfdata[$strpos])) { | |
| 535 | + break; | |
| 536 | + } | |
| 537 | + $ch = $this->pdfdata[$strpos]; | |
| 538 | + switch ($ch) { | |
| 539 | + case '\\': { // REVERSE SOLIDUS (5Ch) (Backslash) | |
| 540 | + // skip next character | |
| 541 | + ++$strpos; | |
| 542 | + break; | |
| 543 | + } | |
| 544 | + case '(': { // LEFT PARENHESIS (28h) | |
| 545 | + ++$open_bracket; | |
| 546 | + break; | |
| 547 | + } | |
| 548 | + case ')': { // RIGHT PARENTHESIS (29h) | |
| 549 | + --$open_bracket; | |
| 550 | + break; | |
| 551 | + } | |
| 552 | + } | |
| 553 | + ++$strpos; | |
| 554 | + } | |
| 555 | + $objval = substr($this->pdfdata, $offset, ($strpos - $offset - 1)); | |
| 556 | + $offset = $strpos; | |
| 557 | + } | |
| 558 | + break; | |
| 559 | + } | |
| 560 | + case '[': // \x5B LEFT SQUARE BRACKET | |
| 561 | + case ']': { // \x5D RIGHT SQUARE BRACKET | |
| 562 | + // array object | |
| 563 | + $objtype = $char; | |
| 564 | + ++$offset; | |
| 565 | + if ($char == '[') { | |
| 566 | + // get array content | |
| 567 | + $objval = array(); | |
| 568 | + do { | |
| 569 | + // get element | |
| 570 | + $element = $this->getRawObject($offset); | |
| 571 | + $offset = $element[2]; | |
| 572 | + $objval[] = $element; | |
| 573 | + } while ($element[0] != ']'); | |
| 574 | + // remove closing delimiter | |
| 575 | + array_pop($objval); | |
| 576 | + } | |
| 577 | + break; | |
| 578 | + } | |
| 579 | + case '<': // \x3C LESS-THAN SIGN | |
| 580 | + case '>': { // \x3E GREATER-THAN SIGN | |
| 581 | + if (isset($this->pdfdata[($offset + 1)]) AND ($this->pdfdata[($offset + 1)] == $char)) { | |
| 582 | + // dictionary object | |
| 583 | + $objtype = $char.$char; | |
| 584 | + $offset += 2; | |
| 585 | + if ($char == '<') { | |
| 586 | + // get array content | |
| 587 | + $objval = array(); | |
| 588 | + do { | |
| 589 | + // get element | |
| 590 | + $element = $this->getRawObject($offset); | |
| 591 | + $offset = $element[2]; | |
| 592 | + $objval[] = $element; | |
| 593 | + } while ($element[0] != '>>'); | |
| 594 | + // remove closing delimiter | |
| 595 | + array_pop($objval); | |
| 596 | + } | |
| 597 | + } else { | |
| 598 | + // hexadecimal string object | |
| 599 | + $objtype = $char; | |
| 600 | + ++$offset; | |
| 601 | + if (($char == '<') AND (preg_match('/^([0-9A-Fa-f\x09\x0a\x0c\x0d\x20]+)>/iU', substr($this->pdfdata, $offset), $matches) == 1)) { | |
| 602 | + // remove white space characters | |
| 603 | + $objval = strtr($matches[1], "\x09\x0a\x0c\x0d\x20", ''); | |
| 604 | + $offset += strlen($matches[0]); | |
| 605 | + } elseif (($endpos = strpos($this->pdfdata, '>', $offset)) !== FALSE) { | |
| 606 | + $offset = $endpos + 1; | |
| 607 | + } | |
| 608 | + } | |
| 609 | + break; | |
| 610 | + } | |
| 611 | + default: { | |
| 612 | + if (substr($this->pdfdata, $offset, 6) == 'endobj') { | |
| 613 | + // indirect object | |
| 614 | + $objtype = 'endobj'; | |
| 615 | + $offset += 6; | |
| 616 | + } elseif (substr($this->pdfdata, $offset, 4) == 'null') { | |
| 617 | + // null object | |
| 618 | + $objtype = 'null'; | |
| 619 | + $offset += 4; | |
| 620 | + $objval = 'null'; | |
| 621 | + } elseif (substr($this->pdfdata, $offset, 4) == 'true') { | |
| 622 | + // boolean true object | |
| 623 | + $objtype = 'boolean'; | |
| 624 | + $offset += 4; | |
| 625 | + $objval = 'true'; | |
| 626 | + } elseif (substr($this->pdfdata, $offset, 5) == 'false') { | |
| 627 | + // boolean false object | |
| 628 | + $objtype = 'boolean'; | |
| 629 | + $offset += 5; | |
| 630 | + $objval = 'false'; | |
| 631 | + } elseif (substr($this->pdfdata, $offset, 6) == 'stream') { | |
| 632 | + // start stream object | |
| 633 | + $objtype = 'stream'; | |
| 634 | + $offset += 6; | |
| 635 | + if (preg_match('/^([\r]?[\n])/isU', substr($this->pdfdata, $offset), $matches) == 1) { | |
| 636 | + $offset += strlen($matches[0]); | |
| 637 | + if (preg_match('/(endstream)[\x09\x0a\x0c\x0d\x20]/isU', substr($this->pdfdata, $offset), $matches, PREG_OFFSET_CAPTURE) == 1) { | |
| 638 | + $objval = substr($this->pdfdata, $offset, $matches[0][1]); | |
| 639 | + $offset += $matches[1][1]; | |
| 640 | + } | |
| 641 | + } | |
| 642 | + } elseif (substr($this->pdfdata, $offset, 9) == 'endstream') { | |
| 643 | + // end stream object | |
| 644 | + $objtype = 'endstream'; | |
| 645 | + $offset += 9; | |
| 646 | + } elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+R/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) { | |
| 647 | + // indirect object reference | |
| 648 | + $objtype = 'objref'; | |
| 649 | + $offset += strlen($matches[0]); | |
| 650 | + $objval = intval($matches[1]).'_'.intval($matches[2]); | |
| 651 | + } elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+obj/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) { | |
| 652 | + // object start | |
| 653 | + $objtype = 'obj'; | |
| 654 | + $objval = intval($matches[1]).'_'.intval($matches[2]); | |
| 655 | + $offset += strlen ($matches[0]); | |
| 656 | + } elseif (($numlen = strspn($this->pdfdata, '+-.0123456789', $offset)) > 0) { | |
| 657 | + // numeric object | |
| 658 | + $objtype = 'numeric'; | |
| 659 | + $objval = substr($this->pdfdata, $offset, $numlen); | |
| 660 | + $offset += $numlen; | |
| 661 | + } | |
| 662 | + break; | |
| 663 | + } | |
| 664 | + } | |
| 665 | + return array($objtype, $objval, $offset); | |
| 666 | + } | |
| 667 | + | |
| 668 | + /** | |
| 669 | + * Get content of indirect object. | |
| 670 | + * @param $obj_ref (string) Object number and generation number separated by underscore character. | |
| 671 | + * @param $offset (int) Object offset. | |
| 672 | + * @param $decoding (boolean) If true decode streams. | |
| 673 | + * @return array containing object data. | |
| 674 | + * @protected | |
| 675 | + * @since 1.0.000 (2011-05-24) | |
| 676 | + */ | |
| 677 | + protected function getIndirectObject($obj_ref, $offset=0, $decoding=true) { | |
| 678 | + $obj = explode('_', $obj_ref); | |
| 679 | + if (($obj === false) OR (count($obj) != 2)) { | |
| 680 | + $this->Error('Invalid object reference: '.$obj); | |
| 681 | + return; | |
| 682 | + } | |
| 683 | + $objref = $obj[0].' '.$obj[1].' obj'; | |
| 684 | + // ignore leading zeros | |
| 685 | + $offset += strspn($this->pdfdata, '0', $offset); | |
| 686 | + if (strpos($this->pdfdata, $objref, $offset) != $offset) { | |
| 687 | + // an indirect reference to an undefined object shall be considered a reference to the null object | |
| 688 | + return array('null', 'null', $offset); | |
| 689 | + } | |
| 690 | + // starting position of object content | |
| 691 | + $offset += strlen($objref); | |
| 692 | + // get array of object content | |
| 693 | + $objdata = array(); | |
| 694 | + $i = 0; // object main index | |
| 695 | + do { | |
| 696 | + $oldoffset = $offset; | |
| 697 | + // get element | |
| 698 | + $element = $this->getRawObject($offset); | |
| 699 | + $offset = $element[2]; | |
| 700 | + // decode stream using stream's dictionary information | |
| 701 | + if ($decoding AND ($element[0] == 'stream') AND (isset($objdata[($i - 1)][0])) AND ($objdata[($i - 1)][0] == '<<')) { | |
| 702 | + $element[3] = $this->decodeStream($objdata[($i - 1)][1], $element[1]); | |
| 703 | + } | |
| 704 | + $objdata[$i] = $element; | |
| 705 | + ++$i; | |
| 706 | + } while (($element[0] != 'endobj') AND ($offset != $oldoffset)); | |
| 707 | + // remove closing delimiter | |
| 708 | + array_pop($objdata); | |
| 709 | + // return raw object content | |
| 710 | + return $objdata; | |
| 711 | + } | |
| 712 | + | |
| 713 | + /** | |
| 714 | + * Get the content of object, resolving indect object reference if necessary. | |
| 715 | + * @param $obj (string) Object value. | |
| 716 | + * @return array containing object data. | |
| 717 | + * @protected | |
| 718 | + * @since 1.0.000 (2011-06-26) | |
| 719 | + */ | |
| 720 | + protected function getObjectVal($obj) { | |
| 721 | + if ($obj[0] == 'objref') { | |
| 722 | + // reference to indirect object | |
| 723 | + if (isset($this->objects[$obj[1]])) { | |
| 724 | + // this object has been already parsed | |
| 725 | + return $this->objects[$obj[1]]; | |
| 726 | + } elseif (isset($this->xref[$obj[1]])) { | |
| 727 | + // parse new object | |
| 728 | + $this->objects[$obj[1]] = $this->getIndirectObject($obj[1], $this->xref[$obj[1]], false); | |
| 729 | + return $this->objects[$obj[1]]; | |
| 730 | + } | |
| 731 | + } | |
| 732 | + return $obj; | |
| 733 | + } | |
| 734 | + | |
| 735 | + /** | |
| 736 | + * Decode the specified stream. | |
| 737 | + * @param $sdic (array) Stream's dictionary array. | |
| 738 | + * @param $stream (string) Stream to decode. | |
| 739 | + * @return array containing decoded stream data and remaining filters. | |
| 740 | + * @protected | |
| 741 | + * @since 1.0.000 (2011-06-22) | |
| 742 | + */ | |
| 743 | + protected function decodeStream($sdic, $stream) { | |
| 744 | + // get stream length and filters | |
| 745 | + $slength = strlen($stream); | |
| 746 | + if ($slength <= 0) { | |
| 747 | + return array('', array()); | |
| 748 | + } | |
| 749 | + $filters = array(); | |
| 750 | + foreach ($sdic as $k => $v) { | |
| 751 | + if ($v[0] == '/') { | |
| 752 | + if (($v[1] == 'Length') AND (isset($sdic[($k + 1)])) AND ($sdic[($k + 1)][0] == 'numeric')) { | |
| 753 | + // get declared stream length | |
| 754 | + $declength = intval($sdic[($k + 1)][1]); | |
| 755 | + if ($declength < $slength) { | |
| 756 | + $stream = substr($stream, 0, $declength); | |
| 757 | + $slength = $declength; | |
| 758 | + } | |
| 759 | + } elseif (($v[1] == 'Filter') AND (isset($sdic[($k + 1)]))) { | |
| 760 | + // resolve indirect object | |
| 761 | + $objval = $this->getObjectVal($sdic[($k + 1)]); | |
| 762 | + if ($objval[0] == '/') { | |
| 763 | + // single filter | |
| 764 | + $filters[] = $objval[1]; | |
| 765 | + } elseif ($objval[0] == '[') { | |
| 766 | + // array of filters | |
| 767 | + foreach ($objval[1] as $flt) { | |
| 768 | + if ($flt[0] == '/') { | |
| 769 | + $filters[] = $flt[1]; | |
| 770 | + } | |
| 771 | + } | |
| 772 | + } | |
| 773 | + } | |
| 774 | + } | |
| 775 | + } | |
| 776 | + // decode the stream | |
| 777 | + $remaining_filters = array(); | |
| 778 | + foreach ($filters as $filter) { | |
| 779 | + if (in_array($filter, TCPDF_FILTERS::getAvailableFilters())) { | |
| 780 | + try { | |
| 781 | + $stream = TCPDF_FILTERS::decodeFilter($filter, $stream); | |
| 782 | + } catch (Exception $e) { | |
| 783 | + $emsg = $e->getMessage(); | |
| 784 | + if ((($emsg[0] == '~') AND !$this->cfg['ignore_missing_filter_decoders']) | |
| 785 | + OR (($emsg[0] != '~') AND !$this->cfg['ignore_filter_decoding_errors'])) { | |
| 786 | + $this->Error($e->getMessage()); | |
| 787 | + } | |
| 788 | + } | |
| 789 | + } else { | |
| 790 | + // add missing filter to array | |
| 791 | + $remaining_filters[] = $filter; | |
| 792 | + } | |
| 793 | + } | |
| 794 | + return array($stream, $remaining_filters); | |
| 795 | + } | |
| 796 | + | |
| 797 | + /** | |
| 798 | + * Throw an exception or print an error message and die if the K_TCPDF_PARSER_THROW_EXCEPTION_ERROR constant is set to true. | |
| 799 | + * @param $msg (string) The error message | |
| 800 | + * @public | |
| 801 | + * @since 1.0.000 (2011-05-23) | |
| 802 | + */ | |
| 803 | + public function Error($msg) { | |
| 804 | + if ($this->cfg['die_for_errors']) { | |
| 805 | + die('<strong>TCPDF_PARSER ERROR: </strong>'.$msg); | |
| 806 | + } else { | |
| 807 | + throw new Exception('TCPDF_PARSER ERROR: '.$msg); | |
| 808 | + } | |
| 809 | + } | |
| 810 | + | |
| 811 | +} // END OF TCPDF_PARSER CLASS | |
| 812 | + | |
| 813 | +//============================================================+ | |
| 814 | +// END OF FILE | |
| 815 | +//============================================================+ | |
