Refcount all the IFX_ stream classes all the time.

core/fpdfapi/edit/fpdf_edit_create.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/edit/editint.h"
 
 #include <memory>
 #include <vector>
@@ skipping 1461 matching lines @@
         return -1;
       }
       m_Offset += len;
       if ((len = m_File.AppendString("\r\n%\xA1\xB3\xC5\xD7\r\n")) < 0) {
         return -1;
       }
       m_Offset += len;
       InitOldObjNumOffsets();
       m_iStage = 20;
     } else {
-      IFX_SeekableReadStream* pSrcFile = m_pParser->GetFileAccess();
+      CFX_RetainPtr<IFX_SeekableReadStream> pSrcFile =
+          m_pParser->GetFileAccess();
       m_Offset = pSrcFile->GetSize();
       m_Pos = (void*)(uintptr_t)m_Offset;
       m_iStage = 15;
     }
   }
   if (m_iStage == 15) {
     if ((m_dwFlags & FPDFCREATE_NO_ORIGINAL) == 0 && m_Pos) {
-      IFX_SeekableReadStream* pSrcFile = m_pParser->GetFileAccess();
-      uint8_t buffer[4096];
+      CFX_RetainPtr<IFX_SeekableReadStream> pSrcFile =
+          m_pParser->GetFileAccess();
+      uint8_t buffer[4096];  // TODO(tsepez): don't stack allocate.
       uint32_t src_size = (uint32_t)(uintptr_t)m_Pos;
       while (src_size) {
         uint32_t block_size = src_size > 4096 ? 4096 : src_size;
         if (!pSrcFile->ReadBlock(buffer, m_Offset - src_size, block_size)) {
           return -1;
         }
         if (m_File.AppendBlock(buffer, block_size) < 0) {
           return -1;
         }
         src_size -= block_size;
@@ skipping 395 matching lines @@
   return m_iStage = 100;
 }
 
 void CPDF_Creator::Clear() {
   m_pXRefStream.reset();
   m_File.Clear();
   m_NewObjNumArray.RemoveAll();
   m_pIDArray.reset();
 }
 
-bool CPDF_Creator::Create(IFX_WriteStream* pFile, uint32_t flags) {
+bool CPDF_Creator::Create(const CFX_RetainPtr<IFX_WriteStream>& pFile,
+                          uint32_t flags) {
   m_File.AttachFile(pFile);
   return Create(flags);
 }
 
 bool CPDF_Creator::Create(uint32_t flags) {
   m_dwFlags = flags;
   m_iStage = 0;
   m_Offset = 0;
   m_dwLastObjNum = m_pDocument->GetLastObjNum();
   m_ObjectOffset.Clear();
@@ skipping 91 matching lines @@
   m_pCryptoHandler = nullptr;
 }
 void CPDF_Creator::ResetStandardSecurity() {
   if (!m_bLocalCryptoHandler)
     return;
 
   delete m_pCryptoHandler;
   m_pCryptoHandler = nullptr;
   m_bLocalCryptoHandler = false;
 }