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472 lines
20 KiB
472 lines
20 KiB
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Pdf
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* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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/** Internally used classes */
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// require_once 'Zend/Pdf/Element.php';
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// require_once 'Zend/Pdf/Element/Numeric.php';
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/** Zend_Pdf_StringParser */
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// require_once 'Zend/Pdf/StringParser.php';
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/**
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* PDF file parser
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*
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* @package Zend_Pdf
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* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Pdf_Parser
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{
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/**
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* String parser
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*
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* @var Zend_Pdf_StringParser
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*/
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private $_stringParser;
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/**
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* Last PDF file trailer
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*
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* @var Zend_Pdf_Trailer_Keeper
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*/
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private $_trailer;
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/**
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* PDF version specified in the file header
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*
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* @var string
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*/
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private $_pdfVersion;
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/**
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* Get length of source PDF
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*
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* @return integer
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*/
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public function getPDFLength()
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{
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return strlen($this->_stringParser->data);
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}
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/**
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* Get PDF String
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*
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* @return string
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*/
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public function getPDFString()
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{
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return $this->_stringParser->data;
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}
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/**
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* PDF version specified in the file header
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*
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* @return string
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*/
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public function getPDFVersion()
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{
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return $this->_pdfVersion;
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}
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/**
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* Load XReference table and referenced objects
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*
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* @param integer $offset
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* @throws Zend_Pdf_Exception
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* @return Zend_Pdf_Trailer_Keeper
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*/
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private function _loadXRefTable($offset)
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{
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$this->_stringParser->offset = $offset;
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// require_once 'Zend/Pdf/Element/Reference/Table.php';
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$refTable = new Zend_Pdf_Element_Reference_Table();
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// require_once 'Zend/Pdf/Element/Reference/Context.php';
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$context = new Zend_Pdf_Element_Reference_Context($this->_stringParser, $refTable);
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$this->_stringParser->setContext($context);
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$nextLexeme = $this->_stringParser->readLexeme();
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if ($nextLexeme == 'xref') {
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/**
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* Common cross-reference table
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*/
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$this->_stringParser->skipWhiteSpace();
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while ( ($nextLexeme = $this->_stringParser->readLexeme()) != 'trailer' ) {
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if (!ctype_digit($nextLexeme)) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross-reference table subheader values must contain only digits.', $this->_stringParser->offset-strlen($nextLexeme)));
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}
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$objNum = (int)$nextLexeme;
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$refCount = $this->_stringParser->readLexeme();
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if (!ctype_digit($refCount)) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross-reference table subheader values must contain only digits.', $this->_stringParser->offset-strlen($refCount)));
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}
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$this->_stringParser->skipWhiteSpace();
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while ($refCount > 0) {
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$objectOffset = substr($this->_stringParser->data, $this->_stringParser->offset, 10);
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if (!ctype_digit($objectOffset)) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Offset must contain only digits.', $this->_stringParser->offset));
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}
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// Force $objectOffset to be treated as decimal instead of octal number
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for ($numStart = 0; $numStart < strlen($objectOffset)-1; $numStart++) {
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if ($objectOffset[$numStart] != '0') {
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break;
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}
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}
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$objectOffset = substr($objectOffset, $numStart);
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$this->_stringParser->offset += 10;
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if (strpos("\x00\t\n\f\r ", $this->_stringParser->data[$this->_stringParser->offset]) === false) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Value separator must be white space.', $this->_stringParser->offset));
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}
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$this->_stringParser->offset++;
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$genNumber = substr($this->_stringParser->data, $this->_stringParser->offset, 5);
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if (!ctype_digit($objectOffset)) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Offset must contain only digits.', $this->_stringParser->offset));
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}
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// Force $objectOffset to be treated as decimal instead of octal number
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for ($numStart = 0; $numStart < strlen($genNumber)-1; $numStart++) {
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if ($genNumber[$numStart] != '0') {
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break;
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}
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}
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$genNumber = substr($genNumber, $numStart);
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$this->_stringParser->offset += 5;
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if (strpos("\x00\t\n\f\r ", $this->_stringParser->data[$this->_stringParser->offset]) === false) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Value separator must be white space.', $this->_stringParser->offset));
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}
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$this->_stringParser->offset++;
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$inUseKey = $this->_stringParser->data[$this->_stringParser->offset];
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$this->_stringParser->offset++;
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switch ($inUseKey) {
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case 'f':
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// free entry
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unset( $this->_refTable[$objNum . ' ' . $genNumber . ' R'] );
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$refTable->addReference($objNum . ' ' . $genNumber . ' R',
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$objectOffset,
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false);
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break;
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case 'n':
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// in-use entry
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$refTable->addReference($objNum . ' ' . $genNumber . ' R',
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$objectOffset,
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true);
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}
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if ( !Zend_Pdf_StringParser::isWhiteSpace(ord( $this->_stringParser->data[$this->_stringParser->offset] )) ) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Value separator must be white space.', $this->_stringParser->offset));
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}
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$this->_stringParser->offset++;
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if ( !Zend_Pdf_StringParser::isWhiteSpace(ord( $this->_stringParser->data[$this->_stringParser->offset] )) ) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Value separator must be white space.', $this->_stringParser->offset));
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}
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$this->_stringParser->offset++;
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$refCount--;
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$objNum++;
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}
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}
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$trailerDictOffset = $this->_stringParser->offset;
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$trailerDict = $this->_stringParser->readElement();
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if (!$trailerDict instanceof Zend_Pdf_Element_Dictionary) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Dictionary expected after \'trailer\' keyword.', $trailerDictOffset));
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}
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} else {
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$xrefStream = $this->_stringParser->getObject($offset, $context);
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if (!$xrefStream instanceof Zend_Pdf_Element_Object_Stream) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross-reference stream expected.', $offset));
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}
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$trailerDict = $xrefStream->dictionary;
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if ($trailerDict->Type->value != 'XRef') {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross-reference stream object must have /Type property assigned to /XRef.', $offset));
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}
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if ($trailerDict->W === null || $trailerDict->W->getType() != Zend_Pdf_Element::TYPE_ARRAY) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross reference stream dictionary doesn\'t have W entry or it\'s not an array.', $offset));
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}
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$entryField1Size = $trailerDict->W->items[0]->value;
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$entryField2Size = $trailerDict->W->items[1]->value;
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$entryField3Size = $trailerDict->W->items[2]->value;
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if ($entryField2Size == 0 || $entryField3Size == 0) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Wrong W dictionary entry. Only type field of stream entries has default value and could be zero length.', $offset));
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}
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$xrefStreamData = $xrefStream->value;
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if ($trailerDict->Index !== null) {
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if ($trailerDict->Index->getType() != Zend_Pdf_Element::TYPE_ARRAY) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross reference stream dictionary Index entry must be an array.', $offset));
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}
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$sections = count($trailerDict->Index->items)/2;
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} else {
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$sections = 1;
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}
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$streamOffset = 0;
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$size = $entryField1Size + $entryField2Size + $entryField3Size;
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$entries = strlen($xrefStreamData)/$size;
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for ($count = 0; $count < $sections; $count++) {
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if ($trailerDict->Index !== null) {
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$objNum = $trailerDict->Index->items[$count*2 ]->value;
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$entries = $trailerDict->Index->items[$count*2 + 1]->value;
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} else {
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$objNum = 0;
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$entries = $trailerDict->Size->value;
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}
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for ($count2 = 0; $count2 < $entries; $count2++) {
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if ($entryField1Size == 0) {
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$type = 1;
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} else if ($entryField1Size == 1) { // Optimyze one-byte field case
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$type = ord($xrefStreamData[$streamOffset++]);
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} else {
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$type = Zend_Pdf_StringParser::parseIntFromStream($xrefStreamData, $streamOffset, $entryField1Size);
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$streamOffset += $entryField1Size;
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}
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if ($entryField2Size == 1) { // Optimyze one-byte field case
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$field2 = ord($xrefStreamData[$streamOffset++]);
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} else {
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$field2 = Zend_Pdf_StringParser::parseIntFromStream($xrefStreamData, $streamOffset, $entryField2Size);
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$streamOffset += $entryField2Size;
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}
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if ($entryField3Size == 1) { // Optimyze one-byte field case
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$field3 = ord($xrefStreamData[$streamOffset++]);
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} else {
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$field3 = Zend_Pdf_StringParser::parseIntFromStream($xrefStreamData, $streamOffset, $entryField3Size);
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$streamOffset += $entryField3Size;
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}
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switch ($type) {
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case 0:
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// Free object
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$refTable->addReference($objNum . ' ' . $field3 . ' R', $field2, false);
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// Debug output:
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// echo "Free object - $objNum $field3 R, next free - $field2\n";
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break;
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case 1:
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// In use object
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$refTable->addReference($objNum . ' ' . $field3 . ' R', $field2, true);
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// Debug output:
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// echo "In-use object - $objNum $field3 R, offset - $field2\n";
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break;
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case 2:
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// Object in an object stream
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// Debug output:
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// echo "Compressed object - $objNum 0 R, object stream - $field2 0 R, offset - $field3\n";
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break;
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}
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$objNum++;
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}
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}
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// $streamOffset . ' ' . strlen($xrefStreamData) . "\n";
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// "$entries\n";
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('Cross-reference streams are not supported yet.');
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}
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// require_once 'Zend/Pdf/Trailer/Keeper.php';
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$trailerObj = new Zend_Pdf_Trailer_Keeper($trailerDict, $context);
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if ($trailerDict->Prev instanceof Zend_Pdf_Element_Numeric ||
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$trailerDict->Prev instanceof Zend_Pdf_Element_Reference ) {
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$trailerObj->setPrev($this->_loadXRefTable($trailerDict->Prev->value));
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$context->getRefTable()->setParent($trailerObj->getPrev()->getRefTable());
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}
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/**
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* We set '/Prev' dictionary property to the current cross-reference section offset.
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* It doesn't correspond to the actual data, but is true when trailer will be used
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* as a trailer for next generated PDF section.
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*/
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$trailerObj->Prev = new Zend_Pdf_Element_Numeric($offset);
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return $trailerObj;
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}
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/**
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* Get Trailer object
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*
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* @return Zend_Pdf_Trailer_Keeper
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*/
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public function getTrailer()
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{
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return $this->_trailer;
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}
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/**
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* Object constructor
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*
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* Note: PHP duplicates string, which is sent by value, only of it's updated.
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* Thus we don't need to care about overhead
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*
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* @param mixed $source
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* @param Zend_Pdf_ElementFactory_Interface $factory
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* @param boolean $load
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* @throws Zend_Exception
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*/
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public function __construct($source, Zend_Pdf_ElementFactory_Interface $factory, $load)
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{
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if ($load) {
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if (($pdfFile = @fopen($source, 'rb')) === false ) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception( "Can not open '$source' file for reading." );
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}
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$data = '';
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$byteCount = filesize($source);
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while ($byteCount > 0 && !feof($pdfFile)) {
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$nextBlock = fread($pdfFile, $byteCount);
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if ($nextBlock === false) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception( "Error occured while '$source' file reading." );
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}
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$data .= $nextBlock;
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$byteCount -= strlen($nextBlock);
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}
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if ($byteCount != 0) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception( "Error occured while '$source' file reading." );
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}
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fclose($pdfFile);
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$this->_stringParser = new Zend_Pdf_StringParser($data, $factory);
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} else {
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$this->_stringParser = new Zend_Pdf_StringParser($source, $factory);
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}
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$pdfVersionComment = $this->_stringParser->readComment();
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if (substr($pdfVersionComment, 0, 5) != '%PDF-') {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('File is not a PDF.');
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}
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$pdfVersion = substr($pdfVersionComment, 5);
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if (version_compare($pdfVersion, '0.9', '<') ||
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version_compare($pdfVersion, '1.61', '>=')
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) {
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/**
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* @todo
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* To support PDF versions 1.5 (Acrobat 6) and PDF version 1.7 (Acrobat 7)
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* Stream compression filter must be implemented (for compressed object streams).
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* Cross reference streams must be implemented
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*/
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('Unsupported PDF version. Zend_Pdf supports PDF 1.0-1.4. Current version - \'%f\'', $pdfVersion));
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}
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$this->_pdfVersion = $pdfVersion;
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$this->_stringParser->offset = strrpos($this->_stringParser->data, '%%EOF');
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if ($this->_stringParser->offset === false ||
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strlen($this->_stringParser->data) - $this->_stringParser->offset > 7) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('Pdf file syntax error. End-of-fle marker expected at the end of file.');
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}
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$this->_stringParser->offset--;
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/**
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* Go to end of cross-reference table offset
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*/
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while (Zend_Pdf_StringParser::isWhiteSpace( ord($this->_stringParser->data[$this->_stringParser->offset]) )&&
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($this->_stringParser->offset > 0)) {
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$this->_stringParser->offset--;
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}
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/**
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* Go to the start of cross-reference table offset
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*/
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while ( (!Zend_Pdf_StringParser::isWhiteSpace( ord($this->_stringParser->data[$this->_stringParser->offset]) ))&&
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($this->_stringParser->offset > 0)) {
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$this->_stringParser->offset--;
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}
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/**
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* Go to the end of 'startxref' keyword
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*/
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while (Zend_Pdf_StringParser::isWhiteSpace( ord($this->_stringParser->data[$this->_stringParser->offset]) )&&
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($this->_stringParser->offset > 0)) {
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$this->_stringParser->offset--;
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}
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/**
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* Go to the white space (eol marker) before 'startxref' keyword
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*/
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$this->_stringParser->offset -= 9;
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$nextLexeme = $this->_stringParser->readLexeme();
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if ($nextLexeme != 'startxref') {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('Pdf file syntax error. \'startxref\' keyword expected. Offset - 0x%X.', $this->_stringParser->offset-strlen($nextLexeme)));
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}
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$startXref = $this->_stringParser->readLexeme();
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if (!ctype_digit($startXref)) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception(sprintf('Pdf file syntax error. Cross-reference table offset must contain only digits. Offset - 0x%X.', $this->_stringParser->offset-strlen($nextLexeme)));
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}
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$this->_trailer = $this->_loadXRefTable($startXref);
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$factory->setObjectCount($this->_trailer->Size->value);
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}
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/**
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* Object destructor
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*/
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public function __destruct()
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{
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$this->_stringParser->cleanUp();
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}
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}
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