File r1920-ADDED-Cycle-detection-for-XRef-tables.patch of Package podofo.8856

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File r1920-ADDED-Cycle-detection-for-XRef-tables.patch of Package podofo.8856

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r1920 | domseichter | 2018-04-14 09:45:49 +0200 (sáb, 14 abr 2018) | 1 line

ADDED: Cycle detection for XRef tables.

Index: src/base/PdfParser.cpp
===================================================================
--- src/base/PdfParser.cpp	(revision 1919)
+++ src/base/PdfParser.cpp	(revision 1920)
@@ -645,6 +645,20 @@
     long long nFirstObject = 0;
     long long nNumObjects  = 0;
 
+    if( m_visitedXRefOffsets.find( lOffset ) != m_visitedXRefOffsets.end() )
+    {
+        std::ostringstream oss;
+        oss << "Cycle in xref structure. Offset  "
+            << lOffset << " already visited.";
+        
+        PODOFO_RAISE_ERROR_INFO( ePdfError_InvalidXRef, oss.str() );
+    }
+    else
+    {
+        m_visitedXRefOffsets.insert( lOffset );
+    }
+    
+    
     size_t curPosition = m_device.Device()->Tell();
     m_device.Device()->Seek(0,std::ios_base::end);
     std::streamoff fileSize = m_device.Device()->Tell();
Index: src/base/PdfParser.h
===================================================================
--- src/base/PdfParser.h	(revision 1919)
+++ src/base/PdfParser.h	(revision 1920)
@@ -594,6 +594,8 @@
     int           m_nReadNextTrailerLevel;
 
     static long   s_nMaxObjects;
+
+    std::set<pdf_long> m_visitedXRefOffsets;
 };
 
 // -----------------------------------------------------

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File r1920-ADDED-Cycle-detection-for-XRef-tables.patch of Package podofo.8856

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