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<?php |
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//============================================================+ |
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// File name : tcpdf_parser.php |
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// Version : 1.0.000 |
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// Begin : 2011-05-23 |
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// Last Update : 2012-01-28 |
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// Author : Nicola Asuni - Tecnick.com LTD - Manor Coach House, Church Hill, Aldershot, Hants, GU12 4RQ, UK - www.tecnick.com - info@tecnick.com |
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// License : http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT GNU-LGPLv3 |
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// ------------------------------------------------------------------- |
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// Copyright (C) 2011-2012 Nicola Asuni - Tecnick.com LTD |
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// |
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// This file is part of TCPDF software library. |
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// |
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// TCPDF is free software: you can redistribute it and/or modify it |
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// under the terms of the GNU Lesser General Public License as |
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// published by the Free Software Foundation, either version 3 of the |
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// License, or (at your option) any later version. |
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// |
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// TCPDF is distributed in the hope that it will be useful, but |
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// WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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// See the GNU Lesser General Public License for more details. |
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// |
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// You should have received a copy of the License |
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// along with TCPDF. If not, see |
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// <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>. |
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// |
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// See LICENSE.TXT file for more information. |
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// ------------------------------------------------------------------- |
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// |
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// Description : This is a PHP class for parsing PDF documents. |
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// |
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//============================================================+ |
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|
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/** |
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* @file |
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* This is a PHP class for parsing PDF documents.<br> |
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* @package com.tecnick.tcpdf |
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* @author Nicola Asuni |
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* @version 1.0.000 |
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*/ |
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|
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// include class for decoding filters |
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require_once(dirname(__FILE__).'/tcpdf_filters.php'); |
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|
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/** |
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* @class TCPDF_PARSER |
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* This is a PHP class for parsing PDF documents.<br> |
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* @package com.tecnick.tcpdf |
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* @brief This is a PHP class for parsing PDF documents.. |
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* @version 1.0.000 |
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* @author Nicola Asuni - info@tecnick.com |
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*/ |
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class TCPDF_PARSER { |
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|
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/** |
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* Raw content of the PDF document. |
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* @private |
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*/ |
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private $pdfdata = ''; |
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|
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/** |
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* XREF data. |
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* @protected |
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*/ |
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protected $xref = array(); |
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|
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/** |
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* Array of PDF objects. |
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* @protected |
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*/ |
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protected $objects = array(); |
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|
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/** |
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* Class object for decoding filters. |
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* @private |
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*/ |
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private $FilterDecoders; |
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|
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// ----------------------------------------------------------------------------- |
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|
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/** |
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* Parse a PDF document an return an array of objects. |
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* @param $data (string) PDF data to parse. |
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* @public |
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* @since 1.0.000 (2011-05-24) |
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*/ |
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public function __construct($data) { |
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if (empty($data)) { |
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$this->Error('Empty PDF data.'); |
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} |
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$this->pdfdata = $data; |
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// get length |
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$pdflen = strlen($this->pdfdata); |
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// initialize class for decoding filters |
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$this->FilterDecoders = new TCPDF_FILTERS(); |
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// get xref and trailer data |
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$this->xref = $this->getXrefData(); |
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// parse all document objects |
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$this->objects = array(); |
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foreach ($this->xref['xref'] as $obj => $offset) { |
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if (!isset($this->objects[$obj])) { |
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$this->objects[$obj] = $this->getIndirectObject($obj, $offset, true); |
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} |
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} |
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// release some memory |
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unset($this->pdfdata); |
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$this->pdfdata = ''; |
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} |
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|
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/** |
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* Return an array of parsed PDF document objects. |
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* @return (array) Array of parsed PDF document objects. |
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* @public |
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* @since 1.0.000 (2011-06-26) |
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*/ |
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public function getParsedData() { |
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return array($this->xref, $this->objects); |
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} |
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|
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/** |
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* Get xref (cross-reference table) and trailer data from PDF document data. |
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* @param $offset (int) xref offset (if know). |
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* @param $xref (array) previous xref array (if any). |
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* @return Array containing xref and trailer data. |
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* @protected |
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* @since 1.0.000 (2011-05-24) |
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*/ |
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protected function getXrefData($offset=0, $xref=array()) { |
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// find last startxref |
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if (preg_match_all('/[\r\n]startxref[\s]*[\r\n]+([0-9]+)[\s]*[\r\n]+%%EOF/i', $this->pdfdata, $matches, PREG_SET_ORDER, $offset) == 0) { |
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$this->Error('Unable to find startxref'); |
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} |
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$matches = array_pop($matches); |
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$startxref = $matches[1]; |
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// check xref position |
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if (strpos($this->pdfdata, 'xref', $startxref) != $startxref) { |
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$this->Error('Unable to find xref'); |
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} |
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// extract xref data (object indexes and offsets) |
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$offset = $startxref + 5; |
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// initialize object number |
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$obj_num = 0; |
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while (preg_match('/^([0-9]+)[\s]([0-9]+)[\s]?([nf]?)/im', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) { |
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$offset = (strlen($matches[0][0]) + $matches[0][1]); |
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if ($matches[3][0] == 'n') { |
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// create unique object index: [object number]_[generation number] |
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$index = $obj_num.'_'.intval($matches[2][0]); |
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// check if object already exist |
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if (!isset($xref['xref'][$index])) { |
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// store object offset position |
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$xref['xref'][$index] = intval($matches[1][0]); |
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} |
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++$obj_num; |
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$offset += 2; |
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} elseif ($matches[3][0] == 'f') { |
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++$obj_num; |
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$offset += 2; |
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} else { |
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// object number (index) |
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$obj_num = intval($matches[1][0]); |
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} |
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} |
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// get trailer data |
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if (preg_match('/trailer[\s]*<<(.*)>>[\s]*[\r\n]+startxref[\s]*[\r\n]+/isU', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) { |
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$trailer_data = $matches[1][0]; |
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if (!isset($xref['trailer'])) { |
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// get only the last updated version |
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$xref['trailer'] = array(); |
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// parse trailer_data |
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if (preg_match('/Size[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) { |
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$xref['trailer']['size'] = intval($matches[1]); |
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} |
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if (preg_match('/Root[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) { |
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$xref['trailer']['root'] = intval($matches[1]).'_'.intval($matches[2]); |
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} |
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if (preg_match('/Encrypt[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) { |
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$xref['trailer']['encrypt'] = intval($matches[1]).'_'.intval($matches[2]); |
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} |
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if (preg_match('/Info[\s]+([0-9]+)[\s]+([0-9]+)[\s]+R/i', $trailer_data, $matches) > 0) { |
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$xref['trailer']['info'] = intval($matches[1]).'_'.intval($matches[2]); |
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} |
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if (preg_match('/ID[\s]*[\[][\s]*[<]([^>]*)[>][\s]*[<]([^>]*)[>]/i', $trailer_data, $matches) > 0) { |
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$xref['trailer']['id'] = array(); |
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$xref['trailer']['id'][0] = $matches[1]; |
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$xref['trailer']['id'][1] = $matches[2]; |
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} |
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} |
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if (preg_match('/Prev[\s]+([0-9]+)/i', $trailer_data, $matches) > 0) { |
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// get previous xref |
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$xref = getXrefData(substr($this->pdfdata, 0, $startxref), intval($matches[1]), $xref); |
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} |
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} else { |
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$this->Error('Unable to find trailer'); |
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} |
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return $xref; |
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} |
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|
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/** |
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* Get object type, raw value and offset to next object |
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* @param $offset (int) Object offset. |
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* @return array containing object type, raw value and offset to next object |
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* @protected |
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* @since 1.0.000 (2011-06-20) |
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*/ |
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protected function getRawObject($offset=0) { |
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$objtype = ''; // object type to be returned |
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$objval = ''; // object value to be returned |
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// 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) |
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$offset += strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $offset); |
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// get first char |
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$char = $this->pdfdata{$offset}; |
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// get object type |
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switch ($char) { |
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case '%': { // \x25 PERCENT SIGN |
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// skip comment and search for next token |
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$next = strcspn($this->pdfdata, "\r\n", $offset); |
| 218 |
if ($next > 0) { |
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$offset += $next; |
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return $this->getRawObject($this->pdfdata, $offset); |
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} |
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break; |
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} |
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case '/': { // \x2F SOLIDUS |
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// name object |
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$objtype = $char; |
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++$offset; |
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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), $matches) == 1) { |
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$objval = $matches[1]; // unescaped value |
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$offset += strlen($objval); |
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} |
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break; |
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} |
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case '(': // \x28 LEFT PARENTHESIS |
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case ')': { // \x29 RIGHT PARENTHESIS |
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// literal string object |
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$objtype = $char; |
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++$offset; |
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$strpos = $offset; |
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if ($char == '(') { |
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$open_bracket = 1; |
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while ($open_bracket > 0) { |
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if (!isset($this->pdfdata{$strpos})) { |
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break; |
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} |
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$ch = $this->pdfdata{$strpos}; |
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switch ($ch) { |
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case '\\': { // REVERSE SOLIDUS (5Ch) (Backslash) |
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// skip next character |
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++$strpos; |
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break; |
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} |
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case '(': { // LEFT PARENHESIS (28h) |
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++$open_bracket; |
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break; |
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} |
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case ')': { // RIGHT PARENTHESIS (29h) |
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--$open_bracket; |
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break; |
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} |
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} |
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++$strpos; |
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} |
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$objval = substr($this->pdfdata, $offset, ($strpos - $offset - 1)); |
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$offset = $strpos; |
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} |
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break; |
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} |
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case '[': // \x5B LEFT SQUARE BRACKET |
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case ']': { // \x5D RIGHT SQUARE BRACKET |
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// array object |
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$objtype = $char; |
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++$offset; |
| 274 |
if ($char == '[') { |
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// get array content |
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$objval = array(); |
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do { |
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// get element |
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$element = $this->getRawObject($offset); |
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$offset = $element[2]; |
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$objval[] = $element; |
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} while ($element[0] != ']'); |
| 283 |
// remove closing delimiter |
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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)} == $char)) { |
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// dictionary object |
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$objtype = $char.$char; |
| 293 |
$offset += 2; |
| 294 |
if ($char == '<') { |
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// get array content |
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$objval = array(); |
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do { |
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// get element |
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$element = $this->getRawObject($offset); |
| 300 |
$offset = $element[2]; |
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$objval[] = $element; |
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} while ($element[0] != '>>'); |
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// remove closing delimiter |
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array_pop($objval); |
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} |
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} else { |
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// hexadecimal string object |
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$objtype = $char; |
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++$offset; |
| 310 |
if (($char == '<') AND (preg_match('/^([0-9A-Fa-f]+)[>]/iU', substr($this->pdfdata, $offset), $matches) == 1)) { |
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$objval = $matches[1]; |
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$offset += strlen($matches[0]); |
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} |
| 314 |
} |
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break; |
| 316 |
} |
| 317 |
default: { |
| 318 |
if (substr($this->pdfdata, $offset, 6) == 'endobj') { |
| 319 |
// indirect object |
| 320 |
$objtype = 'endobj'; |
| 321 |
$offset += 6; |
| 322 |
} elseif (substr($this->pdfdata, $offset, 4) == 'null') { |
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// 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 |
//============================================================+ |
| 502 |
|
