IndirectObjectHolder API updates

core/fpdfapi/fpdf_parser/cfdf_document.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fpdfapi/fpdf_parser/include/cfdf_document.h"
 
 #include "core/fpdfapi/fpdf_edit/include/cpdf_creator.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_syntax_parser.h"
@@ skipping 47 matching lines @@
         break;
 
       word = parser.GetNextWord(nullptr);
       if (word != "obj")
         break;
 
       CPDF_Object* pObj = parser.GetObject(this, objnum, 0, true);
       if (!pObj)
         break;
 
-      InsertIndirectObject(objnum, pObj);
+      ReplaceIndirectObjectIfHigherGeneration(objnum, pObj);
       word = parser.GetNextWord(nullptr);
       if (word != "endobj")
         break;
     } else {
       if (word != "trailer")
         break;
 
       if (CPDF_Dictionary* pMainDict =
               ToDictionary(parser.GetObject(this, 0, 0, true))) {
         m_pRootDict = pMainDict->GetDictBy("Root");
         pMainDict->Release();
       }
       break;
     }
   }
 }
 
 FX_BOOL CFDF_Document::WriteBuf(CFX_ByteTextBuf& buf) const {
   if (!m_pRootDict) {
     return FALSE;
   }
   buf << "%FDF-1.2\r\n";
   for (const auto& pair : m_IndirectObjs) {
     buf << pair.first << " 0 obj\r\n" << pair.second << "\r\nendobj\r\n\r\n";
   }
   buf << "trailer\r\n<</Root " << m_pRootDict->GetObjNum()
       << " 0 R>>\r\n%%EOF\r\n";
   return TRUE;
 }