Call CXFA_Object::ToNode() rather than C-style casting.

xfa/src/fxfa/src/parser/xfa_document_serialize.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/src/foxitlib.h"
 #include "xfa/src/fxfa/src/common/xfa_utils.h"
 #include "xfa/src/fxfa/src/common/xfa_object.h"
 #include "xfa/src/fxfa/src/common/xfa_document.h"
@@ skipping 24 matching lines @@
   if (pDataDocumentParser->DoParse(NULL) < XFA_PARSESTATUS_Done) {
     pDataDocumentParser->Release();
     return FALSE;
   }
   CXFA_Node* pImportDataRoot = pDataDocumentParser->GetRootNode();
   if (!pImportDataRoot) {
     pDataDocumentParser->Release();
     return FALSE;
   }
   CXFA_Node* pDataModel =
-      (CXFA_Node*)m_pDocument->GetXFAObject(XFA_HASHCODE_Datasets);
+      ToNode(m_pDocument->GetXFAObject(XFA_HASHCODE_Datasets));
   if (!pDataModel) {
     pDataDocumentParser->Release();
     return FALSE;
   }
-  CXFA_Node* pDataNode =
-      (CXFA_Node*)m_pDocument->GetXFAObject(XFA_HASHCODE_Data);
+  CXFA_Node* pDataNode = ToNode(m_pDocument->GetXFAObject(XFA_HASHCODE_Data));
   if (pDataNode) {
     pDataModel->RemoveChild(pDataNode);
   }
   if (pImportDataRoot->GetClassID() == XFA_ELEMENT_DataModel) {
     while (CXFA_Node* pChildNode =
                pImportDataRoot->GetNodeItem(XFA_NODEITEM_FirstChild)) {
       pImportDataRoot->RemoveChild(pChildNode);
       pDataModel->InsertChild(pChildNode);
     }
   } else {
@@ skipping 376 matching lines @@
           CFX_WideString::FromUTF8(pChecksum, FXSYS_strlen(pChecksum));
       pStream->WriteString(s_pwChecksum, FXSYS_wcslen(s_pwChecksum));
       pStream->WriteString((const FX_WCHAR*)wsChecksum, wsChecksum.GetLength());
       pStream->WriteString(L"\"", 1);
     }
     pStream->WriteString(L" xmlns=\"", FXSYS_wcslen(L" xmlns=\""));
     const FX_WCHAR* pURI = XFA_GetPacketByIndex(XFA_PACKET_Form)->pURI;
     pStream->WriteString(pURI, FXSYS_wcslen(pURI));
     CFX_WideString wsVersionNumber;
     XFA_DataExporter_RecognizeXFAVersionNumber(
-        (CXFA_Node*)pNode->GetDocument()->GetXFAObject(XFA_XDPPACKET_Template),
+        ToNode(pNode->GetDocument()->GetXFAObject(XFA_XDPPACKET_Template)),
         wsVersionNumber);
     if (wsVersionNumber.IsEmpty()) {
       wsVersionNumber = FX_WSTRC(L"2.8");
     }
     wsVersionNumber += FX_WSTRC(L"/\"\n>");
     pStream->WriteString((const FX_WCHAR*)wsVersionNumber,
                          wsVersionNumber.GetLength());
     CXFA_Node* pChildNode = pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
     while (pChildNode) {
       XFA_DataExporter_RegenerateFormFile_Container(pChildNode, pStream);
@@ skipping 121 matching lines @@
         pXMLElement->RemoveAttribute(L"xfa:dataNode");
       }
     } else {
       IFDE_XMLNode* pXMLNode = pDataNode->GetXMLMappingNode();
       FXSYS_assert(pXMLNode->GetType() == FDE_XMLNODE_Element);
       ((IFDE_XMLElement*)pXMLNode)
           ->SetString(FX_WSTRC(L"xfa:dataNode"), FX_WSTRC(L"dataGroup"));
     }
   }
 }