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314
lib/PdfParser/Parser.php
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314
lib/PdfParser/Parser.php
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<?php
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/**
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* @file
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* This file is part of the PdfParser library.
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*
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* @author Sébastien MALOT <sebastien@malot.fr>
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* @date 2017-01-03
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* @license LGPLv3
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* @url <https://github.com/smalot/pdfparser>
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*
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* PdfParser is a pdf library written in PHP, extraction oriented.
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* Copyright (C) 2017 - Sébastien MALOT <sebastien@malot.fr>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program.
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* If not, see <http://www.pdfparser.org/sites/default/LICENSE.txt>.
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*
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*/
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namespace Smalot\PdfParser;
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use Smalot\PdfParser\Element\ElementArray;
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use Smalot\PdfParser\Element\ElementBoolean;
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use Smalot\PdfParser\Element\ElementDate;
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use Smalot\PdfParser\Element\ElementHexa;
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use Smalot\PdfParser\Element\ElementName;
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use Smalot\PdfParser\Element\ElementNull;
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use Smalot\PdfParser\Element\ElementNumeric;
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use Smalot\PdfParser\Element\ElementString;
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use Smalot\PdfParser\Element\ElementXRef;
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/**
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* Class Parser
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*
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* @package Smalot\PdfParser
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*/
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class Parser
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{
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/**
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* @var Object[]
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*/
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protected $objects = array();
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/**
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*
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*/
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public function __construct()
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{
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}
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/**
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* Parse PDF file
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*
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* @param string $filename
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*
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* @return Document
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*/
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public function parseFile($filename)
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{
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$content = file_get_contents($filename);
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return @$this->parseContent($content);
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}
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/**
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* Parse PDF content
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*
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* @param string $content
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*
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* @return Document
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*/
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public function parseContent($content)
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{
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// Create structure using TCPDF Parser.
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ob_start();
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@$parser = new \TCPDF_PARSER(ltrim($content));
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list($xref, $data) = $parser->getParsedData();
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unset($parser);
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ob_end_clean();
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if (isset($xref['trailer']['encrypt'])) {
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throw new \Exception('Secured pdf file are currently not supported.');
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}
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if (empty($data)) {
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throw new \Exception('Object list not found. Possible secured file.');
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}
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// Create destination object.
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$document = new Document();
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$this->objects = array();
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foreach ($data as $id => $structure) {
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$this->parseObject($id, $structure, $document);
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unset($data[$id]);
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}
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$document->setTrailer($this->parseTrailer($xref['trailer'], $document));
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$document->setObjects($this->objects);
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return $document;
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}
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protected function parseTrailer($structure, $document)
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{
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$trailer = array();
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foreach ($structure as $name => $values) {
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$name = ucfirst($name);
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if (is_numeric($values)) {
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$trailer[$name] = new ElementNumeric($values, $document);
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} elseif (is_array($values)) {
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$value = $this->parseTrailer($values, null);
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$trailer[$name] = new ElementArray($value, null);
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} elseif (strpos($values, '_') !== false) {
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$trailer[$name] = new ElementXRef($values, $document);
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} else {
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$trailer[$name] = $this->parseHeaderElement('(', $values, $document);
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}
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}
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return new Header($trailer, $document);
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}
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/**
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* @param string $id
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* @param array $structure
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* @param Document $document
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*/
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protected function parseObject($id, $structure, $document)
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{
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$header = new Header(array(), $document);
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$content = '';
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foreach ($structure as $position => $part) {
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switch ($part[0]) {
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case '[':
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$elements = array();
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foreach ($part[1] as $sub_element) {
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$sub_type = $sub_element[0];
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$sub_value = $sub_element[1];
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$elements[] = $this->parseHeaderElement($sub_type, $sub_value, $document);
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}
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$header = new Header($elements, $document);
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break;
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case '<<':
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$header = $this->parseHeader($part[1], $document);
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break;
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case 'stream':
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$content = isset($part[3][0]) ? $part[3][0] : $part[1];
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if ($header->get('Type')->equals('ObjStm')) {
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$match = array();
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// Split xrefs and contents.
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preg_match('/^((\d+\s+\d+\s*)*)(.*)$/s', $content, $match);
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$content = $match[3];
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// Extract xrefs.
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$xrefs = preg_split(
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'/(\d+\s+\d+\s*)/s',
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$match[1],
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-1,
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PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE
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);
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$table = array();
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foreach ($xrefs as $xref) {
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list($id, $position) = explode(' ', trim($xref));
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$table[$position] = $id;
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}
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ksort($table);
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$ids = array_values($table);
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$positions = array_keys($table);
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foreach ($positions as $index => $position) {
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$id = $ids[$index] . '_0';
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$next_position = isset($positions[$index + 1]) ? $positions[$index + 1] : strlen($content);
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$sub_content = substr($content, $position, $next_position - $position);
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$sub_header = Header::parse($sub_content, $document);
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$object = Object::factory($document, $sub_header, '');
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$this->objects[$id] = $object;
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}
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// It is not necessary to store this content.
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$content = '';
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return;
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}
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break;
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default:
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if ($part != 'null') {
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$element = $this->parseHeaderElement($part[0], $part[1], $document);
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if ($element) {
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$header = new Header(array($element), $document);
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}
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}
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break;
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}
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}
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if (!isset($this->objects[$id])) {
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$this->objects[$id] = Object::factory($document, $header, $content);
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}
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}
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/**
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* @param array $structure
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* @param Document $document
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*
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* @return Header
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* @throws \Exception
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*/
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protected function parseHeader($structure, $document)
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{
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$elements = array();
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$count = count($structure);
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for ($position = 0; $position < $count; $position += 2) {
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$name = $structure[$position][1];
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$type = $structure[$position + 1][0];
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$value = $structure[$position + 1][1];
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$elements[$name] = $this->parseHeaderElement($type, $value, $document);
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}
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return new Header($elements, $document);
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}
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/**
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* @param $type
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* @param $value
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* @param $document
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*
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* @return Element|Header
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* @throws \Exception
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*/
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protected function parseHeaderElement($type, $value, $document)
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{
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switch ($type) {
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case '<<':
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return $this->parseHeader($value, $document);
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case 'numeric':
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return new ElementNumeric($value, $document);
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case 'boolean':
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return new ElementBoolean($value, $document);
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case 'null':
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return new ElementNull($value, $document);
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case '(':
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if ($date = ElementDate::parse('(' . $value . ')', $document)) {
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return $date;
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} else {
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return ElementString::parse('(' . $value . ')', $document);
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}
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case '<':
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return $this->parseHeaderElement('(', ElementHexa::decode($value, $document), $document);
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case '/':
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return ElementName::parse('/' . $value, $document);
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case 'ojbref': // old mistake in tcpdf parser
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case 'objref':
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return new ElementXRef($value, $document);
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case '[':
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$values = array();
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foreach ($value as $sub_element) {
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$sub_type = $sub_element[0];
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$sub_value = $sub_element[1];
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$values[] = $this->parseHeaderElement($sub_type, $sub_value, $document);
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}
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return new ElementArray($values, $document);
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case 'endstream':
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case 'obj': //I don't know what it means but got my project fixed.
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case '':
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// Nothing to do with.
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break;
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default:
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throw new \Exception('Invalid type: "' . $type . '".');
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}
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}
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}
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