816 lines
27 KiB
PHP
816 lines
27 KiB
PHP
<?php
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//============================================================+
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// File name : tcpdf_parser.php
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// Version : 1.0.16
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// Begin : 2011-05-23
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// Last Update : 2015-04-28
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// Author : Nicola Asuni - Tecnick.com LTD - 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) 2011-2015 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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* @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 1.0.15
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*/
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// include class for decoding filters
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require_once(dirname(__FILE__).'/include/tcpdf_filters.php');
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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 1.0.15
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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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* 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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* 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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* 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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* 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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* Array of configuration parameters.
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* @private
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*/
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private $cfg = array(
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'die_for_errors' => false,
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'ignore_filter_decoding_errors' => true,
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'ignore_missing_filter_decoders' => true,
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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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* @param $cfg (array) Array of configuration parameters:
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* 'die_for_errors' : if true termitate the program execution in case of error, otherwise thows an exception;
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* 'ignore_filter_decoding_errors' : if true ignore filter decoding errors;
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* 'ignore_missing_filter_decoders' : if true ignore missing filter decoding errors.
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* @public
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* @since 1.0.000 (2011-05-24)
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*/
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public function __construct($data, $cfg=array()) {
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if (empty($data)) {
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$this->Error('Empty PDF data.');
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}
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// find the pdf header starting position
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if (($trimpos = strpos($data, '%PDF-')) === FALSE) {
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$this->Error('Invalid PDF data: missing %PDF header.');
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}
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// get PDF content string
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$this->pdfdata = substr($data, $trimpos);
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// get length
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$pdflen = strlen($this->pdfdata);
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// set configuration parameters
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$this->setConfig($cfg);
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// get xref and trailer data
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$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[$obj]) AND ($offset > 0)) {
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// decode objects with positive offset
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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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* Set the configuration parameters.
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* @param $cfg (array) Array of configuration parameters:
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* 'die_for_errors' : if true termitate the program execution in case of error, otherwise thows an exception;
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* 'ignore_filter_decoding_errors' : if true ignore filter decoding errors;
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* 'ignore_missing_filter_decoders' : if true ignore missing filter decoding errors.
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* @public
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*/
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protected function setConfig($cfg) {
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if (isset($cfg['die_for_errors'])) {
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$this->cfg['die_for_errors'] = !!$cfg['die_for_errors'];
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}
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if (isset($cfg['ignore_filter_decoding_errors'])) {
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$this->cfg['ignore_filter_decoding_errors'] = !!$cfg['ignore_filter_decoding_errors'];
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}
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if (isset($cfg['ignore_missing_filter_decoders'])) {
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$this->cfg['ignore_missing_filter_decoders'] = !!$cfg['ignore_missing_filter_decoders'];
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}
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}
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/**
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* Return an array of parsed PDF document objects.
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* @return (array) Array of parsed PDF document objects.
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* @public
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* @since 1.0.000 (2011-06-26)
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*/
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public function getParsedData() {
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return array($this->xref, $this->objects);
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}
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/**
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* Get Cross-Reference (xref) 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, $xref=array()) {
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if ($offset == 0) {
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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 = $matches[1];
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} elseif (strpos($this->pdfdata, 'xref', $offset) == $offset) {
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// Already pointing at the xref table
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$startxref = $offset;
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} elseif (preg_match('/([0-9]+[\s][0-9]+[\s]obj)/i', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset)) {
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// Cross-Reference Stream object
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$startxref = $offset;
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} elseif (preg_match('/[\r\n]startxref[\s]*[\r\n]+([0-9]+)[\s]*[\r\n]+%%EOF/i', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset)) {
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// startxref found
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$startxref = $matches[1][0];
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} else {
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$this->Error('Unable to find startxref');
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}
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// check xref position
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if (strpos($this->pdfdata, 'xref', $startxref) == $startxref) {
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// Cross-Reference
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$xref = $this->decodeXref($startxref, $xref);
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} else {
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// Cross-Reference Stream
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$xref = $this->decodeXrefStream($startxref, $xref);
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}
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if (empty($xref)) {
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$this->Error('Unable to find xref');
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}
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return $xref;
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}
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/**
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* Decode the Cross-Reference section
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* @param $startxref (int) Offset at which the xref section starts (position of the 'xref' keyword).
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* @param $xref (array) Previous xref array (if any).
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* @return Array containing xref and trailer data.
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* @protected
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* @since 1.0.000 (2011-06-20)
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*/
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protected function decodeXref($startxref, $xref=array()) {
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$startxref += 4; // 4 is the length of the word 'xref'
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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 = $startxref + strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $startxref);
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// initialize object number
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$obj_num = 0;
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// search for cross-reference entries or subsection
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while (preg_match('/([0-9]+)[\x20]([0-9]+)[\x20]?([nf]?)(\r\n|[\x20]?[\r\n])/', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
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if ($matches[0][1] != $offset) {
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// we are on another section
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break;
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}
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$offset += strlen($matches[0][0]);
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if ($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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} elseif ($matches[3][0] == 'f') {
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++$obj_num;
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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]*<<(.*)>>/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']) OR empty($xref['trailer'])) {
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// get only the last updated version
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$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 = $this->getXrefData(intval($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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* Decode the Cross-Reference Stream section
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* @param $startxref (int) Offset at which the xref section starts.
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* @param $xref (array) Previous xref array (if any).
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* @return Array containing xref and trailer data.
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* @protected
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* @since 1.0.003 (2013-03-16)
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*/
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protected function decodeXrefStream($startxref, $xref=array()) {
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// try to read Cross-Reference Stream
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$xrefobj = $this->getRawObject($startxref);
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$xrefcrs = $this->getIndirectObject($xrefobj[1], $startxref, true);
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if (!isset($xref['trailer']) OR empty($xref['trailer'])) {
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// get only the last updated version
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$xref['trailer'] = array();
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$filltrailer = true;
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} else {
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$filltrailer = false;
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}
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if (!isset($xref['xref'])) {
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$xref['xref'] = array();
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}
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$valid_crs = false;
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$columns = 0;
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$sarr = $xrefcrs[0][1];
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if (!is_array($sarr)) {
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$sarr = array();
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}
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foreach ($sarr as $k => $v) {
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if (($v[0] == '/') AND ($v[1] == 'Type') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == '/') AND ($sarr[($k +1)][1] == 'XRef'))) {
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$valid_crs = true;
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} elseif (($v[0] == '/') AND ($v[1] == 'Index') AND (isset($sarr[($k +1)]))) {
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// first object number in the subsection
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$index_first = intval($sarr[($k +1)][1][0][1]);
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// number of entries in the subsection
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$index_entries = intval($sarr[($k +1)][1][1][1]);
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} elseif (($v[0] == '/') AND ($v[1] == 'Prev') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) {
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// get previous xref offset
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$prevxref = intval($sarr[($k +1)][1]);
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} elseif (($v[0] == '/') AND ($v[1] == 'W') AND (isset($sarr[($k +1)]))) {
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// number of bytes (in the decoded stream) of the corresponding field
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$wb = array();
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$wb[0] = intval($sarr[($k +1)][1][0][1]);
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$wb[1] = intval($sarr[($k +1)][1][1][1]);
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$wb[2] = intval($sarr[($k +1)][1][2][1]);
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} elseif (($v[0] == '/') AND ($v[1] == 'DecodeParms') AND (isset($sarr[($k +1)][1]))) {
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$decpar = $sarr[($k +1)][1];
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foreach ($decpar as $kdc => $vdc) {
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if (($vdc[0] == '/') AND ($vdc[1] == 'Columns') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) {
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$columns = intval($decpar[($kdc +1)][1]);
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} elseif (($vdc[0] == '/') AND ($vdc[1] == 'Predictor') AND (isset($decpar[($kdc +1)]) AND ($decpar[($kdc +1)][0] == 'numeric'))) {
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$predictor = intval($decpar[($kdc +1)][1]);
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}
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}
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} elseif ($filltrailer) {
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if (($v[0] == '/') AND ($v[1] == 'Size') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'numeric'))) {
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$xref['trailer']['size'] = $sarr[($k +1)][1];
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} elseif (($v[0] == '/') AND ($v[1] == 'Root') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) {
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$xref['trailer']['root'] = $sarr[($k +1)][1];
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} elseif (($v[0] == '/') AND ($v[1] == 'Info') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) {
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$xref['trailer']['info'] = $sarr[($k +1)][1];
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} elseif (($v[0] == '/') AND ($v[1] == 'Encrypt') AND (isset($sarr[($k +1)]) AND ($sarr[($k +1)][0] == 'objref'))) {
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$xref['trailer']['encrypt'] = $sarr[($k +1)][1];
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} elseif (($v[0] == '/') AND ($v[1] == 'ID') AND (isset($sarr[($k +1)]))) {
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$xref['trailer']['id'] = array();
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$xref['trailer']['id'][0] = $sarr[($k +1)][1][0][1];
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$xref['trailer']['id'][1] = $sarr[($k +1)][1][1][1];
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}
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}
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}
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// decode data
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if ($valid_crs AND isset($xrefcrs[1][3][0])) {
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// number of bytes in a row
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$rowlen = ($columns + 1);
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// convert the stream into an array of integers
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$sdata = unpack('C*', $xrefcrs[1][3][0]);
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// split the rows
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$sdata = array_chunk($sdata, $rowlen);
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// initialize decoded array
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$ddata = array();
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// initialize first row with zeros
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$prev_row = array_fill (0, $rowlen, 0);
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// for each row apply PNG unpredictor
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foreach ($sdata as $k => $row) {
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// initialize new row
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$ddata[$k] = array();
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// get PNG predictor value
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$predictor = (10 + $row[0]);
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// for each byte on the row
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for ($i=1; $i<=$columns; ++$i) {
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// new index
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$j = ($i - 1);
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$row_up = $prev_row[$j];
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if ($i == 1) {
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$row_left = 0;
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$row_upleft = 0;
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} else {
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$row_left = $row[($i - 1)];
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$row_upleft = $prev_row[($j - 1)];
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}
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switch ($predictor) {
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case 10: { // PNG prediction (on encoding, PNG None on all rows)
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$ddata[$k][$j] = $row[$i];
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break;
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}
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case 11: { // PNG prediction (on encoding, PNG Sub on all rows)
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$ddata[$k][$j] = (($row[$i] + $row_left) & 0xff);
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break;
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}
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case 12: { // PNG prediction (on encoding, PNG Up on all rows)
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$ddata[$k][$j] = (($row[$i] + $row_up) & 0xff);
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break;
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}
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case 13: { // PNG prediction (on encoding, PNG Average on all rows)
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$ddata[$k][$j] = (($row[$i] + (($row_left + $row_up) / 2)) & 0xff);
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break;
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}
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case 14: { // PNG prediction (on encoding, PNG Paeth on all rows)
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// initial estimate
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$p = ($row_left + $row_up - $row_upleft);
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// distances
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$pa = abs($p - $row_left);
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$pb = abs($p - $row_up);
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$pc = abs($p - $row_upleft);
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$pmin = min($pa, $pb, $pc);
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// return minimum distance
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switch ($pmin) {
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case $pa: {
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$ddata[$k][$j] = (($row[$i] + $row_left) & 0xff);
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break;
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}
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case $pb: {
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$ddata[$k][$j] = (($row[$i] + $row_up) & 0xff);
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break;
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}
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case $pc: {
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$ddata[$k][$j] = (($row[$i] + $row_upleft) & 0xff);
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break;
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}
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}
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break;
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}
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default: { // PNG prediction (on encoding, PNG optimum)
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$this->Error('Unknown PNG predictor');
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break;
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}
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|
}
|
|
}
|
|
$prev_row = $ddata[$k];
|
|
} // end for each row
|
|
// complete decoding
|
|
$sdata = array();
|
|
// for every row
|
|
foreach ($ddata as $k => $row) {
|
|
// initialize new row
|
|
$sdata[$k] = array(0, 0, 0);
|
|
if ($wb[0] == 0) {
|
|
// default type field
|
|
$sdata[$k][0] = 1;
|
|
}
|
|
$i = 0; // count bytes in the row
|
|
// for every column
|
|
for ($c = 0; $c < 3; ++$c) {
|
|
// for every byte on the column
|
|
for ($b = 0; $b < $wb[$c]; ++$b) {
|
|
if (isset($row[$i])) {
|
|
$sdata[$k][$c] += ($row[$i] << (($wb[$c] - 1 - $b) * 8));
|
|
}
|
|
++$i;
|
|
}
|
|
}
|
|
}
|
|
$ddata = array();
|
|
// fill xref
|
|
if (isset($index_first)) {
|
|
$obj_num = $index_first;
|
|
} else {
|
|
$obj_num = 0;
|
|
}
|
|
foreach ($sdata as $k => $row) {
|
|
switch ($row[0]) {
|
|
case 0: { // (f) linked list of free objects
|
|
break;
|
|
}
|
|
case 1: { // (n) objects that are in use but are not compressed
|
|
// create unique object index: [object number]_[generation number]
|
|
$index = $obj_num.'_'.$row[2];
|
|
// check if object already exist
|
|
if (!isset($xref['xref'][$index])) {
|
|
// store object offset position
|
|
$xref['xref'][$index] = $row[1];
|
|
}
|
|
break;
|
|
}
|
|
case 2: { // compressed objects
|
|
// $row[1] = object number of the object stream in which this object is stored
|
|
// $row[2] = index of this object within the object stream
|
|
$index = $row[1].'_0_'.$row[2];
|
|
$xref['xref'][$index] = -1;
|
|
break;
|
|
}
|
|
default: { // null objects
|
|
break;
|
|
}
|
|
}
|
|
++$obj_num;
|
|
}
|
|
} // end decoding data
|
|
if (isset($prevxref)) {
|
|
// get previous xref
|
|
$xref = $this->getXrefData($prevxref, $xref);
|
|
}
|
|
return $xref;
|
|
}
|
|
|
|
/**
|
|
* Get object type, raw value and offset to next object
|
|
* @param $offset (int) Object offset.
|
|
* @return array containing object type, raw value and offset to next object
|
|
* @protected
|
|
* @since 1.0.000 (2011-06-20)
|
|
*/
|
|
protected function getRawObject($offset=0) {
|
|
$objtype = ''; // object type to be returned
|
|
$objval = ''; // object value to be returned
|
|
// 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)
|
|
$offset += strspn($this->pdfdata, "\x00\x09\x0a\x0c\x0d\x20", $offset);
|
|
// get first char
|
|
$char = $this->pdfdata[$offset];
|
|
// get object type
|
|
switch ($char) {
|
|
case '%': { // \x25 PERCENT SIGN
|
|
// skip comment and search for next token
|
|
$next = strcspn($this->pdfdata, "\r\n", $offset);
|
|
if ($next > 0) {
|
|
$offset += $next;
|
|
return $this->getRawObject($offset);
|
|
}
|
|
break;
|
|
}
|
|
case '/': { // \x2F SOLIDUS
|
|
// name object
|
|
$objtype = $char;
|
|
++$offset;
|
|
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) {
|
|
$objval = $matches[1]; // unescaped value
|
|
$offset += strlen($objval);
|
|
}
|
|
break;
|
|
}
|
|
case '(': // \x28 LEFT PARENTHESIS
|
|
case ')': { // \x29 RIGHT PARENTHESIS
|
|
// literal string object
|
|
$objtype = $char;
|
|
++$offset;
|
|
$strpos = $offset;
|
|
if ($char == '(') {
|
|
$open_bracket = 1;
|
|
while ($open_bracket > 0) {
|
|
if (!isset($this->pdfdata[$strpos])) {
|
|
break;
|
|
}
|
|
$ch = $this->pdfdata[$strpos];
|
|
switch ($ch) {
|
|
case '\\': { // REVERSE SOLIDUS (5Ch) (Backslash)
|
|
// skip next character
|
|
++$strpos;
|
|
break;
|
|
}
|
|
case '(': { // LEFT PARENHESIS (28h)
|
|
++$open_bracket;
|
|
break;
|
|
}
|
|
case ')': { // RIGHT PARENTHESIS (29h)
|
|
--$open_bracket;
|
|
break;
|
|
}
|
|
}
|
|
++$strpos;
|
|
}
|
|
$objval = substr($this->pdfdata, $offset, ($strpos - $offset - 1));
|
|
$offset = $strpos;
|
|
}
|
|
break;
|
|
}
|
|
case '[': // \x5B LEFT SQUARE BRACKET
|
|
case ']': { // \x5D RIGHT SQUARE BRACKET
|
|
// array object
|
|
$objtype = $char;
|
|
++$offset;
|
|
if ($char == '[') {
|
|
// get array content
|
|
$objval = array();
|
|
do {
|
|
// get element
|
|
$element = $this->getRawObject($offset);
|
|
$offset = $element[2];
|
|
$objval[] = $element;
|
|
} while ($element[0] != ']');
|
|
// remove closing delimiter
|
|
array_pop($objval);
|
|
}
|
|
break;
|
|
}
|
|
case '<': // \x3C LESS-THAN SIGN
|
|
case '>': { // \x3E GREATER-THAN SIGN
|
|
if (isset($this->pdfdata[($offset + 1)]) AND ($this->pdfdata[($offset + 1)] == $char)) {
|
|
// dictionary object
|
|
$objtype = $char.$char;
|
|
$offset += 2;
|
|
if ($char == '<') {
|
|
// get array content
|
|
$objval = array();
|
|
do {
|
|
// get element
|
|
$element = $this->getRawObject($offset);
|
|
$offset = $element[2];
|
|
$objval[] = $element;
|
|
} while ($element[0] != '>>');
|
|
// remove closing delimiter
|
|
array_pop($objval);
|
|
}
|
|
} else {
|
|
// hexadecimal string object
|
|
$objtype = $char;
|
|
++$offset;
|
|
if (($char == '<') AND (preg_match('/^([0-9A-Fa-f\x09\x0a\x0c\x0d\x20]+)>/iU', substr($this->pdfdata, $offset), $matches) == 1)) {
|
|
// remove white space characters
|
|
$objval = strtr($matches[1], "\x09\x0a\x0c\x0d\x20", '');
|
|
$offset += strlen($matches[0]);
|
|
} elseif (($endpos = strpos($this->pdfdata, '>', $offset)) !== FALSE) {
|
|
$offset = $endpos + 1;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
default: {
|
|
if (substr($this->pdfdata, $offset, 6) == 'endobj') {
|
|
// indirect object
|
|
$objtype = 'endobj';
|
|
$offset += 6;
|
|
} elseif (substr($this->pdfdata, $offset, 4) == 'null') {
|
|
// null object
|
|
$objtype = 'null';
|
|
$offset += 4;
|
|
$objval = 'null';
|
|
} elseif (substr($this->pdfdata, $offset, 4) == 'true') {
|
|
// boolean true object
|
|
$objtype = 'boolean';
|
|
$offset += 4;
|
|
$objval = 'true';
|
|
} elseif (substr($this->pdfdata, $offset, 5) == 'false') {
|
|
// boolean false object
|
|
$objtype = 'boolean';
|
|
$offset += 5;
|
|
$objval = 'false';
|
|
} elseif (substr($this->pdfdata, $offset, 6) == 'stream') {
|
|
// start stream object
|
|
$objtype = 'stream';
|
|
$offset += 6;
|
|
if (preg_match('/^([\r]?[\n])/isU', substr($this->pdfdata, $offset), $matches) == 1) {
|
|
$offset += strlen($matches[0]);
|
|
if (preg_match('/(endstream)[\x09\x0a\x0c\x0d\x20]/isU', substr($this->pdfdata, $offset), $matches, PREG_OFFSET_CAPTURE) == 1) {
|
|
$objval = substr($this->pdfdata, $offset, $matches[0][1]);
|
|
$offset += $matches[1][1];
|
|
}
|
|
}
|
|
} elseif (substr($this->pdfdata, $offset, 9) == 'endstream') {
|
|
// end stream object
|
|
$objtype = 'endstream';
|
|
$offset += 9;
|
|
} elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+R/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
|
|
// indirect object reference
|
|
$objtype = 'objref';
|
|
$offset += strlen($matches[0]);
|
|
$objval = intval($matches[1]).'_'.intval($matches[2]);
|
|
} elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+obj/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
|
|
// object start
|
|
$objtype = 'obj';
|
|
$objval = intval($matches[1]).'_'.intval($matches[2]);
|
|
$offset += strlen ($matches[0]);
|
|
} elseif (($numlen = strspn($this->pdfdata, '+-.0123456789', $offset)) > 0) {
|
|
// numeric object
|
|
$objtype = 'numeric';
|
|
$objval = substr($this->pdfdata, $offset, $numlen);
|
|
$offset += $numlen;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
return array($objtype, $objval, $offset);
|
|
}
|
|
|
|
/**
|
|
* Get content of indirect object.
|
|
* @param $obj_ref (string) Object number and generation number separated by underscore character.
|
|
* @param $offset (int) Object offset.
|
|
* @param $decoding (boolean) If true decode streams.
|
|
* @return array containing object data.
|
|
* @protected
|
|
* @since 1.0.000 (2011-05-24)
|
|
*/
|
|
protected function getIndirectObject($obj_ref, $offset=0, $decoding=true) {
|
|
$obj = explode('_', $obj_ref);
|
|
if (($obj === false) OR (count($obj) != 2)) {
|
|
$this->Error('Invalid object reference: '.$obj);
|
|
return;
|
|
}
|
|
$objref = $obj[0].' '.$obj[1].' obj';
|
|
// ignore leading zeros
|
|
$offset += strspn($this->pdfdata, '0', $offset);
|
|
if (strpos($this->pdfdata, $objref, $offset) != $offset) {
|
|
// an indirect reference to an undefined object shall be considered a reference to the null object
|
|
return array('null', 'null', $offset);
|
|
}
|
|
// starting position of object content
|
|
$offset += strlen($objref);
|
|
// get array of object content
|
|
$objdata = array();
|
|
$i = 0; // object main index
|
|
do {
|
|
$oldoffset = $offset;
|
|
// get element
|
|
$element = $this->getRawObject($offset);
|
|
$offset = $element[2];
|
|
// decode stream using stream's dictionary information
|
|
if ($decoding AND ($element[0] == 'stream') AND (isset($objdata[($i - 1)][0])) AND ($objdata[($i - 1)][0] == '<<')) {
|
|
$element[3] = $this->decodeStream($objdata[($i - 1)][1], $element[1]);
|
|
}
|
|
$objdata[$i] = $element;
|
|
++$i;
|
|
} while (($element[0] != 'endobj') AND ($offset != $oldoffset));
|
|
// remove closing delimiter
|
|
array_pop($objdata);
|
|
// return raw object content
|
|
return $objdata;
|
|
}
|
|
|
|
/**
|
|
* Get the content of object, resolving indect object reference if necessary.
|
|
* @param $obj (string) Object value.
|
|
* @return array containing object data.
|
|
* @protected
|
|
* @since 1.0.000 (2011-06-26)
|
|
*/
|
|
protected function getObjectVal($obj) {
|
|
if ($obj[0] == 'objref') {
|
|
// reference to indirect object
|
|
if (isset($this->objects[$obj[1]])) {
|
|
// this object has been already parsed
|
|
return $this->objects[$obj[1]];
|
|
} elseif (isset($this->xref[$obj[1]])) {
|
|
// parse new object
|
|
$this->objects[$obj[1]] = $this->getIndirectObject($obj[1], $this->xref[$obj[1]], false);
|
|
return $this->objects[$obj[1]];
|
|
}
|
|
}
|
|
return $obj;
|
|
}
|
|
|
|
/**
|
|
* Decode the specified stream.
|
|
* @param $sdic (array) Stream's dictionary array.
|
|
* @param $stream (string) Stream to decode.
|
|
* @return array containing decoded stream data and remaining filters.
|
|
* @protected
|
|
* @since 1.0.000 (2011-06-22)
|
|
*/
|
|
protected function decodeStream($sdic, $stream) {
|
|
// get stream length and filters
|
|
$slength = strlen($stream);
|
|
if ($slength <= 0) {
|
|
return array('', array());
|
|
}
|
|
$filters = array();
|
|
foreach ($sdic as $k => $v) {
|
|
if ($v[0] == '/') {
|
|
if (($v[1] == 'Length') AND (isset($sdic[($k + 1)])) AND ($sdic[($k + 1)][0] == 'numeric')) {
|
|
// get declared stream length
|
|
$declength = intval($sdic[($k + 1)][1]);
|
|
if ($declength < $slength) {
|
|
$stream = substr($stream, 0, $declength);
|
|
$slength = $declength;
|
|
}
|
|
} elseif (($v[1] == 'Filter') AND (isset($sdic[($k + 1)]))) {
|
|
// resolve indirect object
|
|
$objval = $this->getObjectVal($sdic[($k + 1)]);
|
|
if ($objval[0] == '/') {
|
|
// single filter
|
|
$filters[] = $objval[1];
|
|
} elseif ($objval[0] == '[') {
|
|
// array of filters
|
|
foreach ($objval[1] as $flt) {
|
|
if ($flt[0] == '/') {
|
|
$filters[] = $flt[1];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// decode the stream
|
|
$remaining_filters = array();
|
|
foreach ($filters as $filter) {
|
|
if (in_array($filter, TCPDF_FILTERS::getAvailableFilters())) {
|
|
try {
|
|
$stream = TCPDF_FILTERS::decodeFilter($filter, $stream);
|
|
} catch (Exception $e) {
|
|
$emsg = $e->getMessage();
|
|
if ((($emsg[0] == '~') AND !$this->cfg['ignore_missing_filter_decoders'])
|
|
OR (($emsg[0] != '~') AND !$this->cfg['ignore_filter_decoding_errors'])) {
|
|
$this->Error($e->getMessage());
|
|
}
|
|
}
|
|
} else {
|
|
// add missing filter to array
|
|
$remaining_filters[] = $filter;
|
|
}
|
|
}
|
|
return array($stream, $remaining_filters);
|
|
}
|
|
|
|
/**
|
|
* Throw an exception or print an error message and die if the K_TCPDF_PARSER_THROW_EXCEPTION_ERROR constant is set to true.
|
|
* @param $msg (string) The error message
|
|
* @public
|
|
* @since 1.0.000 (2011-05-23)
|
|
*/
|
|
public function Error($msg) {
|
|
if ($this->cfg['die_for_errors']) {
|
|
die('<strong>TCPDF_PARSER ERROR: </strong>'.$msg);
|
|
} else {
|
|
throw new Exception('TCPDF_PARSER ERROR: '.$msg);
|
|
}
|
|
}
|
|
|
|
} // END OF TCPDF_PARSER CLASS
|
|
|
|
//============================================================+
|
|
// END OF FILE
|
|
//============================================================+
|