Refcount all the IFX_ stream classes all the time.

core/fpdfapi/parser/cpdf_data_avail.h

 // Copyright 2016 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
 
 #ifndef CORE_FPDFAPI_PARSER_CPDF_DATA_AVAIL_H_
 #define CORE_FPDFAPI_PARSER_CPDF_DATA_AVAIL_H_
 
 #include <memory>
@@ skipping 77 matching lines @@
     virtual bool IsDataAvail(FX_FILESIZE offset, uint32_t size) = 0;
   };
 
   class DownloadHints {
    public:
     virtual ~DownloadHints();
     virtual void AddSegment(FX_FILESIZE offset, uint32_t size) = 0;
   };
 
   CPDF_DataAvail(FileAvail* pFileAvail,
-                 IFX_SeekableReadStream* pFileRead,
+                 const CFX_RetainPtr<IFX_SeekableReadStream>& pFileRead,
                  bool bSupportHintTable);
   ~CPDF_DataAvail();
 
   bool IsDataAvail(FX_FILESIZE offset, uint32_t size, DownloadHints* pHints);
   DocAvailStatus IsDocAvail(DownloadHints* pHints);
   void SetDocument(CPDF_Document* pDoc);
   DocAvailStatus IsPageAvail(uint32_t dwPage, DownloadHints* pHints);
   DocFormStatus IsFormAvail(DownloadHints* pHints);
   DocLinearizationStatus IsLinearizedPDF();
   bool IsLinearized();
   void GetLinearizedMainXRefInfo(FX_FILESIZE* pPos, uint32_t* pSize);
-  IFX_SeekableReadStream* GetFileRead() const { return m_pFileRead; }
+  CFX_RetainPtr<IFX_SeekableReadStream> GetFileRead() const {
+    return m_pFileRead;
+  }
   int GetPageCount() const;
   CPDF_Dictionary* GetPage(int index);
 
  protected:
   class PageNode {
    public:
     PageNode();
     ~PageNode();
 
     PDF_PAGENODE_TYPE m_type;
@@ skipping 67 matching lines @@
   bool CheckArrayPageNode(uint32_t dwPageNo,
                           PageNode* pPageNode,
                           DownloadHints* pHints);
   bool CheckPageCount(DownloadHints* pHints);
   bool IsFirstCheck(uint32_t dwPage);
   void ResetFirstCheck(uint32_t dwPage);
   bool ValidatePage(uint32_t dwPage);
   bool ValidateForm();
 
   FileAvail* const m_pFileAvail;
-  IFX_SeekableReadStream* const m_pFileRead;
+  CFX_RetainPtr<IFX_SeekableReadStream> m_pFileRead;
   CPDF_Parser m_parser;
   CPDF_SyntaxParser m_syntaxParser;
   std::unique_ptr<CPDF_Object> m_pRoot;
   uint32_t m_dwRootObjNum;
   uint32_t m_dwInfoObjNum;
   std::unique_ptr<CPDF_LinearizedHeader> m_pLinearized;
   CPDF_Object* m_pTrailer;
   bool m_bDocAvail;
   FX_FILESIZE m_dwHeaderOffset;
   FX_FILESIZE m_dwLastXRefOffset;
@@ skipping 37 matching lines @@
   bool m_bTotalLoadPageTree;
   bool m_bCurPageDictLoadOK;
   PageNode m_pageNodes;
   std::set<uint32_t> m_pageMapCheckState;
   std::set<uint32_t> m_pagesLoadState;
   std::unique_ptr<CPDF_HintTables> m_pHintTables;
   bool m_bSupportHintTable;
 };
 
 #endif  // CORE_FPDFAPI_PARSER_CPDF_DATA_AVAIL_H_