Make converstion explicit from CFX_ByteString to uint8_t*

xfa/fxfa/app/xfa_ffimageedit.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 "xfa/fxfa/app/xfa_ffimageedit.h"
 
 #include "xfa/fwl/core/cfwl_message.h"
 #include "xfa/fwl/core/ifwl_app.h"
@@ skipping 122 matching lines @@
   CFX_WideString wsImage;
   IFX_FileRead* pFileRead = FX_CreateFileRead(wsFilePath);
   if (pFileRead) {
     int32_t nDataSize = pFileRead->GetSize();
     if (nDataSize > 0) {
       CFX_ByteString bsBuf;
       FX_CHAR* pImageBuffer = bsBuf.GetBuffer(nDataSize);
       pFileRead->ReadBlock(pImageBuffer, 0, nDataSize);
       bsBuf.ReleaseBuffer();
       if (!bsBuf.IsEmpty()) {
-        FX_CHAR* pData = XFA_Base64Encode(bsBuf, nDataSize);
+        FX_CHAR* pData = XFA_Base64Encode(bsBuf.raw_str(), nDataSize);
         wsImage = CFX_WideString::FromLocal(pData);
         FX_Free(pData);
       }
     }
     m_pDataAcc->SetImageEditImage(NULL);
     pFileRead->Release();
   }
   m_pDataAcc->SetImageEdit(wsContentType.AsStringC(), CFX_WideStringC(),
                            wsImage.AsStringC());
   m_pDataAcc->LoadImageEditImage();
@@ skipping 24 matching lines @@
   return m_pOldDelegate->OnProcessMessage(pMessage);
 }
 FWL_ERR CXFA_FFImageEdit::OnProcessEvent(CFWL_Event* pEvent) {
   CXFA_FFField::OnProcessEvent(pEvent);
   return m_pOldDelegate->OnProcessEvent(pEvent);
 }
 FWL_ERR CXFA_FFImageEdit::OnDrawWidget(CFX_Graphics* pGraphics,
                                        const CFX_Matrix* pMatrix) {
   return m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
 }