Refcount all the IFX_ stream classes all the time.

core/fxcrt/fx_basic_buffer.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 <algorithm>
 #include <limits>
 
 #include "core/fxcrt/fx_basic.h"
@@ skipping 216 matching lines @@
 }
 
 CFX_FileBufferArchive::CFX_FileBufferArchive()
     : m_Length(0), m_pFile(nullptr) {}
 
 CFX_FileBufferArchive::~CFX_FileBufferArchive() {}
 
 void CFX_FileBufferArchive::Clear() {
   m_Length = 0;
   m_pBuffer.reset();
-  m_pFile = nullptr;
+  m_pFile.Reset();
 }
 
 bool CFX_FileBufferArchive::Flush() {
   size_t nRemaining = m_Length;
   m_Length = 0;
   if (!m_pFile)
     return false;
   if (!m_pBuffer || !nRemaining)
     return true;
   return m_pFile->WriteBlock(m_pBuffer.get(), nRemaining);
@@ skipping 30 matching lines @@
 int32_t CFX_FileBufferArchive::AppendDWord(uint32_t i) {
   char buf[32];
   FXSYS_itoa(i, buf, 10);
   return AppendBlock(buf, (size_t)FXSYS_strlen(buf));
 }
 
 int32_t CFX_FileBufferArchive::AppendString(const CFX_ByteStringC& lpsz) {
   return AppendBlock(lpsz.raw_str(), lpsz.GetLength());
 }
 
-void CFX_FileBufferArchive::AttachFile(IFX_WriteStream* pFile) {
+void CFX_FileBufferArchive::AttachFile(
+    const CFX_RetainPtr<IFX_WriteStream>& pFile) {
   ASSERT(pFile);
   m_pFile = pFile;
 }