Beispiel #1
0
 /**
  * Load XReference table and referenced objects
  *
  * @param integer $offset
  * @throws Zend_Pdf_Exception
  * @return Zend_Pdf_Trailer_Keeper
  */
 private function _loadXRefTable($offset)
 {
     $this->_pushContext();
     $this->_current = $offset;
     $refTable = new Zend_Pdf_Element_Reference_Table();
     $context = new Zend_Pdf_Element_Reference_Context($this, $refTable);
     $this->_currentContext = $context;
     $nextLexeme = $this->_readLexeme();
     if ($nextLexeme == 'xref') {
         /**
          * Common cross-reference table
          */
         $this->_skipWhiteSpace();
         while (($nextLexeme = $this->_readLexeme()) != 'trailer') {
             if (!ctype_digit($nextLexeme)) {
                 throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross-reference table subheader values must contain only digits.', $this->_current - strlen($nextLexeme)));
             }
             $objNum = (int) $nextLexeme;
             $refCount = $this->_readLexeme();
             if (!ctype_digit($refCount)) {
                 throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X. Cross-reference table subheader values must contain only digits.', $this->_current - strlen($refCount)));
             }
             $this->_skipWhiteSpace();
             while ($refCount > 0) {
                 $objectOffset = substr($this->_pdfString, $this->_current, 10);
                 if (!ctype_digit($objectOffset)) {
                     throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Offset must contain only digits.', $this->_current));
                 }
                 // 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);
                 $this->_current += 10;
                 if (!self::isWhiteSpace(ord($this->_pdfString[$this->_current]))) {
                     throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Value separator must be white space.', $this->_current));
                 }
                 $this->_current++;
                 $genNumber = substr($this->_pdfString, $this->_current, 5);
                 if (!ctype_digit($objectOffset)) {
                     throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Offset must contain only digits.', $this->_current));
                 }
                 // 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);
                 $this->_current += 5;
                 if (!self::isWhiteSpace(ord($this->_pdfString[$this->_current]))) {
                     throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Value separator must be white space.', $this->_current));
                 }
                 $this->_current++;
                 $inUseKey = $this->_pdfString[$this->_current];
                 $this->_current++;
                 switch ($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', $objectOffset, true);
                 }
                 if (!self::isWhiteSpace(ord($this->_pdfString[$this->_current]))) {
                     throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Value separator must be white space.', $this->_current));
                 }
                 $this->_current++;
                 if (!self::isWhiteSpace(ord($this->_pdfString[$this->_current]))) {
                     throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Value separator must be white space.', $this->_current));
                 }
                 $this->_current++;
                 $refCount--;
                 $objNum++;
             }
         }
         $trailerDictOffset = $this->_current;
         $trailerDict = $this->_readElementalObject();
         if (!$trailerDict instanceof Zend_Pdf_Element_Dictionary) {
             throw new Zend_Pdf_Exception(sprintf('PDF file syntax error. Offset - 0x%X.  Dictionary expected after \'trailer\' keyword.', $trailerDictOffset));
         }
         $trailerObj = new Zend_Pdf_Trailer_Keeper($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 trailer for next generated PDF section.
          */
         $trailerObj->Prev = new Zend_Pdf_Element_Numeric($offset);
     } else {
         throw new Zend_Exception(sprintf('Pdf file syntax error. Offset - 0x%X. \'xref\' lexeme expected.', $this->_current - strlen($nextLexeme)));
         /**
          * @todo Cross-Reference stream object must be loaded here.
          */
     }
     $this->_popContext();
     return $trailerObj;
 }
Beispiel #2
0
 /**
  * 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 LIB_DIR . '/Zend/Pdf/Element/Reference/Table.php';
     $refTable = new Zend_Pdf_Element_Reference_Table();
     require_once LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/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("\t\n\f\r ", $this->_stringParser->data[$this->_stringParser->offset]) === false) {
                     require_once LIB_DIR . '/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 LIB_DIR . '/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("\t\n\f\r ", $this->_stringParser->data[$this->_stringParser->offset]) === false) {
                     require_once LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/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 LIB_DIR . '/Zend/Pdf/Exception.php';
         throw new Zend_Pdf_Exception('Cross-reference streams are not supported yet.');
     }
     require_once LIB_DIR . '/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 $trailerObj;
 }
Beispiel #3
0
 private function _loadXRefTable($offset)
 {
     $this->_stringParser->offset = $offset;
     $refTable = new Zend_Pdf_Element_Reference_Table();
     $context = new Zend_Pdf_Element_Reference_Context($this->_stringParser, $refTable);
     $this->_stringParser->setContext($context);
     $nextLexeme = $this->_stringParser->readLexeme();
     if ($nextLexeme == 'xref') {
         $this->_stringParser->skipWhiteSpace();
         while (($nextLexeme = $this->_stringParser->readLexeme()) != 'trailer') {
             if (!ctype_digit($nextLexeme)) {
                 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)) {
                 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)) {
                     throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Offset must contain only digits.', $this->_stringParser->offset));
                 }
                 for ($numStart = 0; $numStart < strlen($objectOffset) - 1; $numStart++) {
                     if ($objectOffset[$numStart] != '0') {
                         break;
                     }
                 }
                 $objectOffset = substr($objectOffset, $numStart);
                 $this->_stringParser->offset += 10;
                 if (strpos("\t\n\f\r ", $this->_stringParser->data[$this->_stringParser->offset]) === false) {
                     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)) {
                     throw new Zend_Pdf_Exception(sprintf('PDF file cross-reference table syntax error. Offset - 0x%X. Offset must contain only digits.', $this->_stringParser->offset));
                 }
                 for ($numStart = 0; $numStart < strlen($genNumber) - 1; $numStart++) {
                     if ($genNumber[$numStart] != '0') {
                         break;
                     }
                 }
                 $genNumber = substr($genNumber, $numStart);
                 $this->_stringParser->offset += 5;
                 if (strpos("\t\n\f\r ", $this->_stringParser->data[$this->_stringParser->offset]) === false) {
                     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':
                         unset($this->_refTable[$objNum . ' ' . $genNumber . ' R']);
                         $refTable->addReference($objNum . ' ' . $genNumber . ' R', $objectOffset, false);
                         break;
                     case 'n':
                         $refTable->addReference($objNum . ' ' . $genNumber . ' R', $objectOffset, true);
                 }
                 if (!Zend_Pdf_StringParser::isWhiteSpace(ord($this->_stringParser->data[$this->_stringParser->offset]))) {
                     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]))) {
                     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) {
             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) {
             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') {
             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) {
             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) {
             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) {
                 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) {
                         $type = ord($xrefStreamData[$streamOffset++]);
                     } else {
                         $type = Zend_Pdf_StringParser::parseIntFromStream($xrefStreamData, $streamOffset, $entryField1Size);
                         $streamOffset += $entryField1Size;
                     }
                 }
                 if ($entryField2Size == 1) {
                     $field2 = ord($xrefStreamData[$streamOffset++]);
                 } else {
                     $field2 = Zend_Pdf_StringParser::parseIntFromStream($xrefStreamData, $streamOffset, $entryField2Size);
                     $streamOffset += $entryField2Size;
                 }
                 if ($entryField3Size == 1) {
                     $field3 = ord($xrefStreamData[$streamOffset++]);
                 } else {
                     $field3 = Zend_Pdf_StringParser::parseIntFromStream($xrefStreamData, $streamOffset, $entryField3Size);
                     $streamOffset += $entryField3Size;
                 }
                 switch ($type) {
                     case 0:
                         $refTable->addReference($objNum . ' ' . $field3 . ' R', $field2, false);
                         break;
                     case 1:
                         $refTable->addReference($objNum . ' ' . $field3 . ' R', $field2, true);
                         break;
                     case 2:
                         break;
                 }
                 $objNum++;
             }
         }
         throw new Zend_Pdf_Exception('Cross-reference streams are not supported yet.');
     }
     $trailerObj = new Zend_Pdf_Trailer_Keeper($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());
     }
     $trailerObj->Prev = new Zend_Pdf_Element_Numeric($offset);
     return $trailerObj;
 }