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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Parser.php 18993 2009-11-15 17:09:16Z alexander $
*/
/** Internally used classes */
require_once 'Zend/Pdf/Element.php';
require_once 'Zend/Pdf/Element/Numeric.php';
/** Zend_Pdf_StringParser */
require_once 'Zend/Pdf/StringParser.php';
/**
* PDF file parser
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Parser
{
/**
* String parser
*
* @var Zend_Pdf_StringParser
*/
private $_stringParser;
/**
* Last PDF file trailer
*
* @var Zend_Pdf_Trailer_Keeper
*/
private $_trailer;
/**
* PDF version specified in the file header
*
* @var string
*/
private $_pdfVersion;
/**
* Get length of source PDF
*
* @return integer
*/
public function getPDFLength()
{
return strlen($this->_stringParser->data);
}
/**
* Get PDF String
*
* @return string
*/
public function getPDFString()
{
return $this->_stringParser->data;
}
/**
* PDF version specified in the file header
*
* @return string
*/
public function getPDFVersion()
{
return $this->_pdfVersion;
}
/**
* Load XReference table and referenced objects
*
* @param integer $offset
* @throws Zend_Pdf_Exception
* @return Zend_Pdf_Trailer_Keeper
*/
private function _loadXRefTable($offset)
{
$this->_stringParser->offset = $offset;
require_once 'Zend/Pdf/Element/Reference/Table.php';
$refTable = new Zend_Pdf_Element_Reference_Table();
require_once 'Zend/Pdf/Element/Reference/Context.php';
$context = new Zend_Pdf_Element_Reference_Context($this->_stringParser, $refTable);
$this->_stringParser->setContext($context);
$nextLexeme = $this->_stringParser->readLexeme();
if ($nextLexeme == 'xref') {
/**
* Common cross-reference table
*/
$this->_stringParser->skipWhiteSpace();
while ( ($nextLexeme = $this->_stringParser->readLexeme()) != 'trailer' ) {
if (!ctype_digit($nextLexeme)) {
require_once 'Zend/Pdf/Exception.php';
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)));
}
$objNum = (int)$nextLexeme;
$refCount = $this->_stringParser->readLexeme();
if (!ctype_digit($refCount)) {
require_once 'Zend/Pdf/Exception.php';
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)));
}
$this->_stringParser->skipWhiteSpace();
while ($refCount > 0) {
$objectOffset = substr($this->_stringParser->data, $this->_stringParser->offset, 10);
if (!ctype_digit($objectOffset)) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Offset must contain only digits.', $this->_stringParser->offset));
}
// Force $objectOffset to be treated as decimal instead of octal number
for ($numStart = 0; $numStart < strlen($objectOffset)-1; $numStart++) {
if ($objectOffset[$numStart] != '0') {
break;
}
}
$objectOffset = substr($objectOffset, $numStart);
$this->_stringParser->offset += 10;
if (strpos("\x00\t\n\f\r ", $this->_stringParser->data[$this->_stringParser->offset]) === false) {
require_once 'Zend/Pdf/Exception.php';
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));
}
$this->_stringParser->offset++;
$genNumber = substr($this->_stringParser->data, $this->_stringParser->offset, 5);
if (!ctype_digit($objectOffset)) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Offset must contain only digits.', $this->_stringParser->offset));
}
// Force $objectOffset to be treated as decimal instead of octal number
for ($numStart = 0; $numStart < strlen($genNumber)-1; $numStart++) {
if ($genNumber[$numStart] != '0') {
break;
}
}
$genNumber = substr($genNumber, $numStart);
$this->_stringParser->offset += 5;
if (strpos("\x00\t\n\f\r ", $this->_stringParser->data[$this->_stringParser->offset]) === false) {
require_once 'Zend/Pdf/Exception.php';
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));
}
$this->_stringParser->offset++;
$inUseKey = $this->_stringParser->data[$this->_stringParser->offset];
$this->_stringParser->offset++;
switch ($inUseKey) {
case 'f':
// free entry
unset( $this->_refTable[$objNum . ' ' . $genNumber . ' R'] );
$refTable->addReference($objNum . ' ' . $genNumber . ' R',
$objectOffset,
false);
break;
case 'n':
// in-use entry
$refTable->addReference($objNum . ' ' . $genNumber . ' R',
$objectOffset,
true);
}
if ( !Zend_Pdf_StringParser::isWhiteSpace(ord( $this->_stringParser->data[$this->_stringParser->offset] )) ) {
require_once 'Zend/Pdf/Exception.php';
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));
}
$this->_stringParser->offset++;
if ( !Zend_Pdf_StringParser::isWhiteSpace(ord( $this->_stringParser->data[$this->_stringParser->offset] )) ) {
require_once 'Zend/Pdf/Exception.php';
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));
}
$this->_stringParser->offset++;
$refCount--;
$objNum++;
}
}
$trailerDictOffset = $this->_stringParser->offset;
$trailerDict = $this->_stringParser->readElement();
if (!$trailerDict instanceof Zend_Pdf_Element_Dictionary) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Dictionary expected after \'trailer\' keyword.', $trailerDictOffset));
}
} else {
$xrefStream = $this->_stringParser->getObject($offset, $context);
if (!$xrefStream instanceof Zend_Pdf_Element_Object_Stream) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross-reference stream expected.', $offset));
}
$trailerDict = $xrefStream->dictionary;
if ($trailerDict->Type->value != 'XRef') {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross-reference stream object must have /Type property assigned to /XRef.', $offset));
}
if ($trailerDict->W === null || $trailerDict->W->getType() != Zend_Pdf_Element::TYPE_ARRAY) {
require_once 'Zend/Pdf/Exception.php';
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));
}
$entryField1Size = $trailerDict->W->items[0]->value;
$entryField2Size = $trailerDict->W->items[1]->value;
$entryField3Size = $trailerDict->W->items[2]->value;
if ($entryField2Size == 0 || $entryField3Size == 0) {
require_once 'Zend/Pdf/Exception.php';
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));
}
$xrefStreamData = &$xrefStream->value;
if ($trailerDict->Index !== null) {
if ($trailerDict->Index->getType() != Zend_Pdf_Element::TYPE_ARRAY) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross reference stream dictionary Index entry must be an array.', $offset));
}
$sections = count($trailerDict->Index->items)/2;
} else {
$sections = 1;
}
$streamOffset = 0;
$size = $entryField1Size + $entryField2Size + $entryField3Size;
$entries = strlen($xrefStreamData)/$size;
for ($count = 0; $count < $sections; $count++) {
if ($trailerDict->Index !== null) {
$objNum = $trailerDict->Index->items[$count*2 ]->value;
$entries = $trailerDict->Index->items[$count*2 + 1]->value;
} else {
$objNum = 0;
$entries = $trailerDict->Size->value;
}
for ($count2 = 0; $count2 < $entries; $count2++) {
if ($entryField1Size == 0) {
$type = 1;
} else if ($entryField1Size == 1) { // Optimyze one-byte field case
$type = ord($xrefStreamData[$streamOffset++]);
} else {
$type = Zend_Pdf_StringParser::parseIntFromStream($xrefStreamData, $streamOffset, $entryField1Size);
$streamOffset += $entryField1Size;
}
if ($entryField2Size == 1) { // Optimyze one-byte field case
$field2 = ord($xrefStreamData[$streamOffset++]);
} else {
$field2 = Zend_Pdf_StringParser::parseIntFromStream($xrefStreamData, $streamOffset, $entryField2Size);
$streamOffset += $entryField2Size;
}
if ($entryField3Size == 1) { // Optimyze one-byte field case
$field3 = ord($xrefStreamData[$streamOffset++]);
} else {
$field3 = Zend_Pdf_StringParser::parseIntFromStream($xrefStreamData, $streamOffset, $entryField3Size);
$streamOffset += $entryField3Size;
}
switch ($type) {
case 0:
// Free object
$refTable->addReference($objNum . ' ' . $field3 . ' R', $field2, false);
// Debug output:
// echo "Free object - $objNum $field3 R, next free - $field2\n";
break;
case 1:
// In use object
$refTable->addReference($objNum . ' ' . $field3 . ' R', $field2, true);
// Debug output:
// echo "In-use object - $objNum $field3 R, offset - $field2\n";
break;
case 2:
// Object in an object stream
// Debug output:
// echo "Compressed object - $objNum 0 R, object stream - $field2 0 R, offset - $field3\n";
break;
}
$objNum++;
}
}
// $streamOffset . ' ' . strlen($xrefStreamData) . "\n";
// "$entries\n";
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Cross-reference streams are not supported yet.');
}
require_once 'Zend/Pdf/Trailer/Keeper.php';
$trailerObj = new Zend_Pdf_Trailer_Keeper($trailerDict, $context);
if ($trailerDict->Prev instanceof Zend_Pdf_Element_Numeric ||
$trailerDict->Prev instanceof Zend_Pdf_Element_Reference ) {
$trailerObj->setPrev($this->_loadXRefTable($trailerDict->Prev->value));
$context->getRefTable()->setParent($trailerObj->getPrev()->getRefTable());
}
/**
* We set '/Prev' dictionary property to the current cross-reference section offset.
* It doesn't correspond to the actual data, but is true when trailer will be used
* as a trailer for next generated PDF section.
*/
$trailerObj->Prev = new Zend_Pdf_Element_Numeric($offset);
return $trailerObj;
}
/**
* Get Trailer object
*
* @return Zend_Pdf_Trailer_Keeper
*/
public function getTrailer()
{
return $this->_trailer;
}
/**
* Object constructor
*
* Note: PHP duplicates string, which is sent by value, only of it's updated.
* Thus we don't need to care about overhead
*
* @param mixed $source
* @param Zend_Pdf_ElementFactory_Interface $factory
* @param boolean $load
* @throws Zend_Exception
*/
public function __construct($source, Zend_Pdf_ElementFactory_Interface $factory, $load)
{
if ($load) {
if (($pdfFile = @fopen($source, 'rb')) === false ) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception( "Can not open '$source' file for reading." );
}
$byteCount = filesize($source);
$data = fread($pdfFile, $byteCount);
$byteCount -= strlen($data);
while ( $byteCount > 0 && ($nextBlock = fread($pdfFile, $byteCount)) != false ) {
$data .= $nextBlock;
$byteCount -= strlen($nextBlock);
}
fclose($pdfFile);
$this->_stringParser = new Zend_Pdf_StringParser($data, $factory);
} else {
$this->_stringParser = new Zend_Pdf_StringParser($source, $factory);
}
$pdfVersionComment = $this->_stringParser->readComment();
if (substr($pdfVersionComment, 0, 5) != '%PDF-') {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('File is not a PDF.');
}
$pdfVersion = substr($pdfVersionComment, 5);
if (version_compare($pdfVersion, '0.9', '<') ||
version_compare($pdfVersion, '1.61', '>=')
) {
/**
* @todo
* To support PDF versions 1.5 (Acrobat 6) and PDF version 1.7 (Acrobat 7)
* Stream compression filter must be implemented (for compressed object streams).
* Cross reference streams must be implemented
*/
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception(sprintf('Unsupported PDF version. Zend_Pdf supports PDF 1.0-1.4. Current version - \'%f\'', $pdfVersion));
}
$this->_pdfVersion = $pdfVersion;
$this->_stringParser->offset = strrpos($this->_stringParser->data, '%%EOF');
if ($this->_stringParser->offset === false ||
strlen($this->_stringParser->data) - $this->_stringParser->offset > 7) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Pdf file syntax error. End-of-fle marker expected at the end of file.');
}
$this->_stringParser->offset--;
/**
* Go to end of cross-reference table offset
*/
while (Zend_Pdf_StringParser::isWhiteSpace( ord($this->_stringParser->data[$this->_stringParser->offset]) )&&
($this->_stringParser->offset > 0)) {
$this->_stringParser->offset--;
}
/**
* Go to the start of cross-reference table offset
*/
while ( (!Zend_Pdf_StringParser::isWhiteSpace( ord($this->_stringParser->data[$this->_stringParser->offset]) ))&&
($this->_stringParser->offset > 0)) {
$this->_stringParser->offset--;
}
/**
* Go to the end of 'startxref' keyword
*/
while (Zend_Pdf_StringParser::isWhiteSpace( ord($this->_stringParser->data[$this->_stringParser->offset]) )&&
($this->_stringParser->offset > 0)) {
$this->_stringParser->offset--;
}
/**
* Go to the white space (eol marker) before 'startxref' keyword
*/
$this->_stringParser->offset -= 9;
$nextLexeme = $this->_stringParser->readLexeme();
if ($nextLexeme != 'startxref') {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception(sprintf('Pdf file syntax error. \'startxref\' keyword expected. Offset - 0x%X.', $this->_stringParser->offset-strlen($nextLexeme)));
}
$startXref = $this->_stringParser->readLexeme();
if (!ctype_digit($startXref)) {
require_once 'Zend/Pdf/Exception.php';
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)));
}
$this->_trailer = $this->_loadXRefTable($startXref);
$factory->setObjectCount($this->_trailer->Size->value);
}
/**
* Object destructor
*/
public function __destruct()
{
$this->_stringParser->cleanUp();
}
}
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