Merge to XFA: Use IPDF_DataAvail interface to hide CPDF_DataAvail.

fpdfsdk/src/fpdf_dataavail.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 "../include/fsdk_define.h"
 #include "../include/fpdf_dataavail.h"
 #include "../include/fpdfxfa/fpdfxfa_doc.h"
 #include "../include/fpdfformfill.h"
@@ skipping 75 matching lines @@
         CFPDF_DataAvail()
         {
                 m_pDataAvail = NULL;
         }
 
         ~CFPDF_DataAvail()
         {
                 if (m_pDataAvail) delete m_pDataAvail;
         }
 
-        CPDF_DataAvail*                 m_pDataAvail;
+        IPDF_DataAvail*                 m_pDataAvail;
         CFPDF_FileAvailWrap             m_FileAvail;
         CFPDF_FileAccessWrap    m_FileRead;
 };
 
 DLLEXPORT FPDF_AVAIL STDCALL FPDFAvail_Create(FX_FILEAVAIL* file_avail, FPDF_FILEACCESS* file)
 {
         CFPDF_DataAvail* pAvail = FX_NEW CFPDF_DataAvail;
         pAvail->m_FileAvail.Set(file_avail);
         pAvail->m_FileRead.Set(file);
-        pAvail->m_pDataAvail = FX_NEW CPDF_DataAvail(&pAvail->m_FileAvail, &pAvail->m_FileRead);
+        pAvail->m_pDataAvail = IPDF_DataAvail::Create(&pAvail->m_FileAvail, &pAvail->m_FileRead);
         return pAvail;
 }
 
 DLLEXPORT void STDCALL FPDFAvail_Destroy(FPDF_AVAIL avail)
 {
         if (avail == NULL) return;
         delete (CFPDF_DataAvail*)avail;
 }
 
 DLLEXPORT int STDCALL FPDFAvail_IsDocAvail(FPDF_AVAIL avail, FX_DOWNLOADHINTS* hints)
@@ skipping 48 matching lines @@
         CFPDF_DownloadHintsWrap hints_wrap(hints);
         return ((CFPDF_DataAvail*)avail)->m_pDataAvail->IsFormAvail(&hints_wrap);
 }
 
 DLLEXPORT FPDF_BOOL STDCALL FPDFAvail_IsLinearized(FPDF_AVAIL avail)
 {
                 if (avail == NULL) return -1;
         return ((CFPDF_DataAvail*)avail)->m_pDataAvail->IsLinearizedPDF();
 
 }