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511 lines
16 KiB
PHP
Executable File
511 lines
16 KiB
PHP
Executable File
<?php
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//============================================================+
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// File name : tcpdf_parser.php
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// Version : 1.0.001
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// Begin : 2011-05-23
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// Last Update : 2012-05-03
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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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* @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 1.0.001
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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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* @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 1.0.001
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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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/**
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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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$this->pdfdata = '';
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}
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/**
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* Return an array of parsed PDF document objects.
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* @return (array) Array of parsed PDF document objects.
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* @public
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* @since 1.0.000 (2011-06-26)
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*/
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public function getParsedData() {
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return array($this->xref, $this->objects);
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}
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/**
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* Get 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, $xref=array()) {
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if ($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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} else {
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// get the first xref at the specified offset
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if (preg_match('/[\r\n]startxref[\s]*[\r\n]+([0-9]+)[\s]*[\r\n]+%%EOF/i', $this->pdfdata, $matches, PREG_OFFSET_CAPTURE, $offset) == 0) {
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$this->Error('Unable to find startxref');
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}
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$startxref = $matches[1][0];
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}
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// check xref position
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if (strpos($this->pdfdata, 'xref', $startxref) != $startxref) {
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$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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$xoffset = $startxref + 5;
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// initialize object number
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$obj_num = 0;
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$offset = $xoffset;
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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, $xoffset) > 0) {
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$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 = $this->getXrefData(intval($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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* 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", $offset);
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if ($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;
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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] != ']');
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// remove closing delimiter
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array_pop($objval);
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}
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break;
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}
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case '<': // \x3C LESS-THAN SIGN
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case '>': { // \x3E GREATER-THAN SIGN
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if (isset($this->pdfdata{($offset + 1)}) AND ($this->pdfdata{($offset + 1)} == $char)) {
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// dictionary object
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$objtype = $char.$char;
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$offset += 2;
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if ($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] != '>>');
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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;
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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($matches[0]);
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}
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}
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break;
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}
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default: {
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if (substr($this->pdfdata, $offset, 6) == 'endobj') {
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// indirect object
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$objtype = 'endobj';
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$offset += 6;
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} elseif (substr($this->pdfdata, $offset, 4) == 'null') {
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// null object
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$objtype = 'null';
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$offset += 4;
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$objval = 'null';
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} elseif (substr($this->pdfdata, $offset, 4) == 'true') {
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// boolean true object
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$objtype = 'boolean';
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$offset += 4;
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$objval = 'true';
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} elseif (substr($this->pdfdata, $offset, 5) == 'false') {
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// boolean false object
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$objtype = 'boolean';
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$offset += 5;
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$objval = 'false';
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} elseif (substr($this->pdfdata, $offset, 6) == 'stream') {
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// start stream object
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$objtype = 'stream';
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$offset += 6;
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if (preg_match('/^[\r\n]+(.*)[\r\n]*endstream/isU', substr($this->pdfdata, $offset), $matches) == 1) {
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$objval = $matches[1];
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$offset += strlen($matches[0]);
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}
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} elseif (substr($this->pdfdata, $offset, 9) == 'endstream') {
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// end stream object
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$objtype = 'endstream';
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$offset += 9;
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} elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+R/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
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// indirect object reference
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$objtype = 'ojbref';
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$offset += strlen($matches[0]);
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$objval = intval($matches[1]).'_'.intval($matches[2]);
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} elseif (preg_match('/^([0-9]+)[\s]+([0-9]+)[\s]+obj/iU', substr($this->pdfdata, $offset, 33), $matches) == 1) {
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// object start
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$objtype = 'ojb';
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$objval = intval($matches[1]).'_'.intval($matches[2]);
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$offset += strlen ($matches[0]);
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} elseif (($numlen = strspn($this->pdfdata, '+-.0123456789', $offset)) > 0) {
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// numeric object
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$objtype = 'numeric';
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$objval = substr($this->pdfdata, $offset, $numlen);
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$offset += $numlen;
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}
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break;
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}
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}
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return array($objtype, $objval, $offset);
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}
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/**
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* Get content of indirect object.
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* @param $obj_ref (string) Object number and generation number separated by underscore character.
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* @param $offset (int) Object offset.
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* @param $decoding (boolean) If true decode streams.
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* @return array containing object data.
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* @protected
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* @since 1.0.000 (2011-05-24)
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*/
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protected function getIndirectObject($obj_ref, $offset=0, $decoding=true) {
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$obj = explode('_', $obj_ref);
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if (($obj === false) OR (count($obj) != 2)) {
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$this->Error('Invalid object reference: '.$obj);
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return;
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}
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$objref = $obj[0].' '.$obj[1].' obj';
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if (strpos($this->pdfdata, $objref, $offset) != $offset) {
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// an indirect reference to an undefined object shall be considered a reference to the null object
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return array('null', 'null', $offset);
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}
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// starting position of object content
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$offset += strlen($objref);
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// get array of object content
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$objdata = array();
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$i = 0; // object main index
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do {
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// get element
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$element = $this->getRawObject($offset);
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$offset = $element[2];
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// decode stream using stream's dictionary information
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if ($decoding AND ($element[0] == 'stream') AND (isset($objdata[($i - 1)][0])) AND ($objdata[($i - 1)][0] == '<<')) {
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$element[3] = $this->decodeStream($objdata[($i - 1)][1], substr($element[1], 1));
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}
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$objdata[$i] = $element;
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++$i;
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} while ($element[0] != 'endobj');
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// remove closing delimiter
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array_pop($objdata);
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// return raw object content
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return $objdata;
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}
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/**
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* Get the content of object, resolving indect object reference if necessary.
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* @param $obj (string) Object value.
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* @return array containing object data.
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* @protected
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* @since 1.0.000 (2011-06-26)
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*/
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protected function getObjectVal($obj) {
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if ($obj[0] == 'objref') {
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// reference to indirect object
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if (isset($this->objects[$obj[1]])) {
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// this object has been already parsed
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return $this->objects[$obj[1]];
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} elseif (isset($this->xref[$obj[1]])) {
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// parse new object
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$this->objects[$obj[1]] = $this->getIndirectObject($obj[1], $this->xref[$obj[1]], false);
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return $this->objects[$obj[1]];
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}
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}
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return $obj;
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}
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/**
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* Decode the specified stream.
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* @param $sdic (array) Stream's dictionary array.
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* @param $stream (string) Stream to decode.
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* @return array containing decoded stream data and remaining filters.
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* @protected
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* @since 1.0.000 (2011-06-22)
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*/
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protected function decodeStream($sdic, $stream) {
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// get stream lenght and filters
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$slength = strlen($stream);
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$filters = array();
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foreach ($sdic as $k => $v) {
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if ($v[0] == '/') {
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if (($v[1] == 'Length') AND (isset($sdic[($k + 1)])) AND ($sdic[($k + 1)][0] == 'numeric')) {
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// get declared stream lenght
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$declength = intval($sdic[($k + 1)][1]);
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if ($declength < $slength) {
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$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, $this->FilterDecoders->getAvailableFilters())) {
|
|
$stream = $this->FilterDecoders->decodeFilter($filter, $stream);
|
|
} else {
|
|
// add missing filter to array
|
|
$remaining_filters[] = $filter;
|
|
}
|
|
}
|
|
return array($stream, $remaining_filters);
|
|
}
|
|
|
|
/**
|
|
* This method is automatically called in case of fatal error; it simply outputs the message and halts the execution.
|
|
* @param $msg (string) The error message
|
|
* @public
|
|
* @since 1.0.000 (2011-05-23)
|
|
*/
|
|
public function Error($msg) {
|
|
// exit program and print error
|
|
die('<strong>TCPDF_PARSER ERROR: </strong>'.$msg);
|
|
}
|
|
|
|
} // END OF TCPDF_PARSER CLASS
|
|
|
|
//============================================================+
|
|
// END OF FILE
|
|
//============================================================+
|