Introduce CPDF_Document::FromFPDFDocument().

fpdfsdk/src/fpdfeditpage.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 "../../public/fpdf_edit.h"
 #include "../../public/fpdf_formfill.h"
 #include "../include/fsdk_define.h"
 
@@ skipping 26 matching lines @@
   if (pInfoDict) {
     if (FSDK_IsSandBoxPolicyEnabled(FPDF_POLICY_MACHINETIME_ACCESS))
       pInfoDict->SetAt("CreationDate", new CPDF_String(DateStr));
     pInfoDict->SetAt("Creator", new CPDF_String(L"PDFium"));
   }
 
   return pDoc;
 }
 
 DLLEXPORT void STDCALL FPDFPage_Delete(FPDF_DOCUMENT document, int page_index) {
-  CPDF_Document* pDoc = (CPDF_Document*)document;
-  if (pDoc == NULL)
-    return;
-  if (page_index < 0 || page_index >= pDoc->GetPageCount())
+  CPDF_Document* pDoc = CPDF_Document::FromFPDFDocument(document);
+  if (!pDoc || page_index < 0 || page_index >= pDoc->GetPageCount())
     return;
 
   pDoc->DeletePage(page_index);
 }
 
 DLLEXPORT FPDF_PAGE STDCALL FPDFPage_New(FPDF_DOCUMENT document,
                                          int page_index,
                                          double width,
                                          double height) {
-  if (!document)
-    return NULL;
+  CPDF_Document* pDoc = CPDF_Document::FromFPDFDocument(document);
+  if (!pDoc)
+    return nullptr;
 
-  //    CPDF_Parser* pParser = (CPDF_Parser*)document;
-  CPDF_Document* pDoc = (CPDF_Document*)document;
   if (page_index < 0)
     page_index = 0;
   if (pDoc->GetPageCount() < page_index)
     page_index = pDoc->GetPageCount();
-  //    if (page_index < 0 || page_index >= pDoc->GetPageCount())
-  //            return NULL;
 
   CPDF_Dictionary* pPageDict = pDoc->CreateNewPage(page_index);
   if (!pPageDict)
     return NULL;
   CPDF_Array* pMediaBoxArray = new CPDF_Array;
   pMediaBoxArray->Add(new CPDF_Number(0));
   pMediaBoxArray->Add(new CPDF_Number(0));
   pMediaBoxArray->Add(new CPDF_Number(FX_FLOAT(width)));
   pMediaBoxArray->Add(new CPDF_Number(FX_FLOAT(height)));
 
@@ skipping 239 matching lines @@
       !pPage->m_pFormDict->GetElement("Type")->GetDirect() ||
       pPage->m_pFormDict->GetElement("Type")->GetDirect()->GetString().Compare(
           "Page")) {
     return;
   }
   CPDF_Dictionary* pDict = pPage->m_pFormDict;
   rotate %= 4;
 
   pDict->SetAt("Rotate", new CPDF_Number(rotate * 90));
 }