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

xfa/src/fxfa/src/parser/xfa_objectacc_imp.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 1903 matching lines @@
       if (i == eCheckState) {
         pText->TryContent(wsContent);
         break;
       }
       pText = pText->GetNodeItem(XFA_NODEITEM_NextSibling);
     }
     SyncValue(wsContent, bNotify);
   }
 }
 CXFA_Node* CXFA_WidgetData::GetExclGroupNode() {
-  CXFA_Node* pExcl = (CXFA_Node*)m_pNode->GetNodeItem(XFA_NODEITEM_Parent);
+  CXFA_Node* pExcl = ToNode(m_pNode->GetNodeItem(XFA_NODEITEM_Parent));
   if (!pExcl || pExcl->GetClassID() != XFA_ELEMENT_ExclGroup) {
     return NULL;
   }
   return pExcl;
 }
 CXFA_Node* CXFA_WidgetData::GetSelectedMember() {
   CXFA_Node* pSelectedMember = NULL;
   CFX_WideString wsState = GetRawValue();
   if (wsState.IsEmpty()) {
     return pSelectedMember;
   }
-  for (CXFA_Node* pNode =
-           (CXFA_Node*)m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
-       pNode != NULL; pNode = pNode->GetNodeItem(XFA_NODEITEM_NextSibling)) {
+  for (CXFA_Node* pNode = ToNode(m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild));
+       pNode; pNode = pNode->GetNodeItem(XFA_NODEITEM_NextSibling)) {
     CXFA_WidgetData widgetData(pNode);
     if (widgetData.GetCheckState() == XFA_CHECKSTATE_On) {
       pSelectedMember = pNode;
       break;
     }
   }
   return pSelectedMember;
 }
 CXFA_Node* CXFA_WidgetData::SetSelectedMember(const CFX_WideStringC& wsName,
                                               FX_BOOL bNotify) {
   CXFA_Node* pSelectedMember = NULL;
   FX_DWORD nameHash =
       FX_HashCode_String_GetW(wsName.GetPtr(), wsName.GetLength());
-  for (CXFA_Node* pNode =
-           (CXFA_Node*)m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild);
-       pNode != NULL; pNode = pNode->GetNodeItem(XFA_NODEITEM_NextSibling)) {
+  for (CXFA_Node* pNode = ToNode(m_pNode->GetNodeItem(XFA_NODEITEM_FirstChild));
+       pNode; pNode = pNode->GetNodeItem(XFA_NODEITEM_NextSibling)) {
     if (pNode->GetNameHash() == nameHash) {
       CXFA_WidgetData widgetData(pNode);
       widgetData.SetCheckState(XFA_CHECKSTATE_On, bNotify);
       pSelectedMember = pNode;
       break;
     }
   }
   return pSelectedMember;
 }
 void CXFA_WidgetData::SetSelectedMemberByValue(const CFX_WideStringC& wsValue,
@@ skipping 1835 matching lines @@
     return FX_WSTRC(L"");
   }
   CXFA_Node* pRefNode = m_pNode->GetChild(nIndex, XFA_ELEMENT_Ref);
   if (!pRefNode) {
     return FX_WSTRC(L"");
   }
   CFX_WideString wsContent;
   pRefNode->TryContent(wsContent);
   return wsContent;
 }