Remove "this==NULL" and adjust corresponding callers

core/src/fpdfapi/fpdf_parser/fpdf_parser_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 "../../../include/fpdfapi/fpdf_parser.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 extern FX_LPVOID PDFPreviewInitCache(CPDF_Document* pDoc);
 extern void PDFPreviewClearCache(FX_LPVOID pCache);
@@ skipping 43 matching lines @@
     if (pIDArray) {
         m_ID1 = pIDArray->GetString(0);
         m_ID2 = pIDArray->GetString(1);
     }
     m_PageList.SetSize(_GetPageCount());
 }
 void CPDF_Document::LoadAsynDoc(CPDF_Dictionary *pLinearized)
 {
     m_bLinearized = TRUE;
     m_LastObjNum = m_pParser->GetLastObjNum();
-    m_pRootDict = GetIndirectObject(m_pParser->GetRootObjNum())->GetDict();
+    CPDF_Object* indirectObj = GetIndirectObject(m_pParser->GetRootObjNum());
+    m_pRootDict = indirectObj ? indirectObj->GetDict() : NULL;
     if (m_pRootDict == NULL) {
         return;
     }
-    m_pInfoDict = GetIndirectObject(m_pParser->GetInfoObjNum())->GetDict();
+    indirectObj = GetIndirectObject(m_pParser->GetInfoObjNum());
+    m_pInfoDict = indirectObj ? indirectObj->GetDict() : NULL;
     CPDF_Array* pIDArray = m_pParser->GetIDArray();
     if (pIDArray) {
         m_ID1 = pIDArray->GetString(0);
         m_ID2 = pIDArray->GetString(1);
     }
     FX_DWORD dwPageCount = 0;
     CPDF_Object *pCount = pLinearized->GetElement(FX_BSTRC("N"));
     if (pCount && pCount->GetType() == PDFOBJ_NUMBER) {
         dwPageCount = pCount->GetInteger();
     }
@@ skipping 250 matching lines @@
     }
     _EnumPages(pPages, pHandler);
 }
 FX_BOOL CPDF_Document::IsContentUsedElsewhere(FX_DWORD objnum, CPDF_Dictionary* pThisPageDict)
 {
     for (int i = 0; i < m_PageList.GetSize(); i ++) {
         CPDF_Dictionary* pPageDict = GetPage(i);
         if (pPageDict == pThisPageDict) {
             continue;
         }
-        CPDF_Object* pContents = pPageDict->GetElement(FX_BSTRC("Contents"));
+        CPDF_Object* pContents = pPageDict ? pPageDict->GetElement(FX_BSTRC("Contents")) : NULL;
         if (pContents == NULL) {
             continue;
         }
         if (pContents->GetDirectType() == PDFOBJ_ARRAY) {
             CPDF_Array* pArray = (CPDF_Array*)pContents->GetDirect();
             for (FX_DWORD j = 0; j < pArray->GetCount(); j ++) {
                 CPDF_Reference* pRef = (CPDF_Reference*)pArray->GetElement(j);
                 if (pRef->GetRefObjNum() == objnum) {
                     return TRUE;
                 }
@@ skipping 39 matching lines @@
     if (m_pDocPage) {
         CPDF_ModuleMgr::Get()->GetPageModule()->ClearDoc(this);
     }
 }
 void CPDF_Document::ClearRenderData()
 {
     if (m_pDocRender) {
         CPDF_ModuleMgr::Get()->GetRenderModule()->ClearDocData(m_pDocRender);
     }
 }