Add type cast definitions for CPDF_Array.

core/src/fpdfdoc/doc_formcontrol.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/fpdfdoc/fpdf_doc.h"
 CPDF_FormControl::CPDF_FormControl(CPDF_FormField* pField,
                                    CPDF_Dictionary* pWidgetDict) {
   m_pField = pField;
@@ skipping 68 matching lines @@
     }
   }
 }
 CFX_ByteString CPDF_FormControl::GetCheckedAPState() {
   ASSERT(GetType() == CPDF_FormField::CheckBox ||
          GetType() == CPDF_FormField::RadioButton);
   CFX_ByteString csOn = GetOnStateName();
   if (GetType() == CPDF_FormField::RadioButton ||
       GetType() == CPDF_FormField::CheckBox) {
     CPDF_Object* pOpt = FPDF_GetFieldAttr(m_pField->m_pDict, "Opt");
-    if (pOpt != NULL && pOpt->GetType() == PDFOBJ_ARRAY) {
+    if (pOpt && pOpt->IsArray()) {
       int iIndex = m_pField->GetControlIndex(this);
       csOn.Format("%d", iIndex);
     }
   }
-  if (csOn.IsEmpty()) {
+  if (csOn.IsEmpty())
     csOn = "Yes";
-  }
   return csOn;
 }
 CFX_WideString CPDF_FormControl::GetExportValue() {
   ASSERT(GetType() == CPDF_FormField::CheckBox ||
          GetType() == CPDF_FormField::RadioButton);
   CFX_ByteString csOn = GetOnStateName();
   if (GetType() == CPDF_FormField::RadioButton ||
       GetType() == CPDF_FormField::CheckBox) {
     CPDF_Object* pOpt = FPDF_GetFieldAttr(m_pField->m_pDict, "Opt");
-    if (pOpt != NULL && pOpt->GetType() == PDFOBJ_ARRAY) {
+    if (CPDF_Array* pArray = ToArray(pOpt)) {
       int iIndex = m_pField->GetControlIndex(this);
-      csOn = ((CPDF_Array*)pOpt)->GetString(iIndex);
+      csOn = pArray->GetString(iIndex);
     }
   }
   if (csOn.IsEmpty()) {
     csOn = "Yes";
   }
   CFX_WideString csWOn = PDF_DecodeText(csOn);
   return csWOn;
 }
 FX_BOOL CPDF_FormControl::IsChecked() {
   ASSERT(GetType() == CPDF_FormField::CheckBox ||
@@ skipping 320 matching lines @@
     return NULL;
   }
   return m_pDict->GetDict(FX_BSTRC("IF"));
 }
 int CPDF_ApSettings::GetTextPosition() {
   if (m_pDict == NULL) {
     return TEXTPOS_CAPTION;
   }
   return m_pDict->GetInteger(FX_BSTRC("TP"), TEXTPOS_CAPTION);
 }