Refcount all the IFX_ stream classes all the time.

fpdfsdk/fsdk_define.h

 // 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
 
 #ifndef FPDFSDK_FSDK_DEFINE_H_
 #define FPDFSDK_FSDK_DEFINE_H_
 
 #include "core/fpdfapi/parser/cpdf_parser.h"
 #include "core/fxge/fx_dib.h"
 #include "public/fpdfview.h"
 
 #ifdef PDF_ENABLE_XFA
 #include "fpdfsdk/fpdfxfa/cpdfxfa_context.h"
 #endif  // PDF_ENABLE_XFA
 
 #ifdef _WIN32
 #include <math.h>
 #include <tchar.h>
 #endif
 
 class CPDF_Annot;
 class CPDF_Page;
 class CPDF_PageRenderContext;
 class IFSDK_PAUSE_Adapter;
 
 // Layering prevents fxcrt from knowing about FPDF_FILEACCESS, so this can't
 // be a static method of IFX_SeekableReadStream.
-IFX_SeekableReadStream* MakeSeekableReadStream(FPDF_FILEACCESS* pFileAccess);
+CFX_RetainPtr<IFX_SeekableReadStream> MakeSeekableReadStream(
+    FPDF_FILEACCESS* pFileAccess);
 
 #ifdef PDF_ENABLE_XFA
 // Layering prevents fxcrt from knowing about FPDF_FILEHANDLER, so this can't
 // be a static method of IFX_SeekableStream.
-IFX_SeekableStream* MakeSeekableStream(FPDF_FILEHANDLER* pFileHandler);
+CFX_RetainPtr<IFX_SeekableStream> MakeSeekableStream(
+    FPDF_FILEHANDLER* pFileHandler);
 #endif  // PDF_ENABLE_XFA
 
 // Object types for public FPDF_ types; these correspond to next layer down
 // from fpdfsdk. For master, these are CPDF_ types, but for XFA, these are
 // CPDFXFA_ types.
 #ifndef PDF_ENABLE_XFA
 using UnderlyingDocumentType = CPDF_Document;
 using UnderlyingPageType = CPDF_Page;
 #else   // PDF_ENABLE_XFA
 using UnderlyingDocumentType = CPDFXFA_Context;
@@ skipping 25 matching lines @@
                             int rotate,
                             int flags,
                             bool bNeedToRestore,
                             IFSDK_PAUSE_Adapter* pause);
 
 void CheckUnSupportError(CPDF_Document* pDoc, uint32_t err_code);
 void CheckUnSupportAnnot(CPDF_Document* pDoc, const CPDF_Annot* pPDFAnnot);
 void ProcessParseError(CPDF_Parser::Error err);
 
 #endif  // FPDFSDK_FSDK_DEFINE_H_