Use static_cast for various CPDF_Object conversions.

fpdfsdk/src/fsdk_baseform.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 "../../third_party/base/nonstd_unique_ptr.h"
 #include "../include/fsdk_define.h"
 #include "../include/fsdk_mgr.h"
 #include "../include/fsdk_baseannot.h"
@@ skipping 2173 matching lines @@
 FX_BOOL CPDFSDK_InterForm::DoAction_ImportData(const CPDF_Action& action) {
   return FALSE;
 }
 
 void CPDFSDK_InterForm::GetFieldFromObjects(const CFX_PtrArray& objects,
                                             CFX_PtrArray& fields) {
   ASSERT(m_pInterForm != NULL);
 
   int iCount = objects.GetSize();
   for (int i = 0; i < iCount; i++) {
-    CPDF_Object* pObject = (CPDF_Object*)objects[i];
-    if (pObject == NULL)
+    CPDF_Object* pObject = static_cast<CPDF_Object*>(objects[i]);
+    if (!pObject)
       continue;
 
     if (pObject->IsString()) {
       CFX_WideString csName = pObject->GetUnicodeText();
       CPDF_FormField* pField = m_pInterForm->GetField(0, csName);
-      if (pField != NULL)
+      if (pField)
         fields.Add(pField);
     } else if (pObject->IsDictionary()) {
       if (m_pInterForm->IsValidFormField(pObject))
         fields.Add(pObject);
     }
   }
 }
 
 /* ----------------------------- CPDF_FormNotify -----------------------------
  */
@@ skipping 395 matching lines @@
   ASSERT(pAnnot != NULL);
 
   CPDF_Annot* pPDFAnnot = pAnnot->GetPDFAnnot();
   ASSERT(pPDFAnnot != NULL);
 
   CPDF_Rect rcAnnot;
   pPDFAnnot->GetRect(rcAnnot);
 
   return rcAnnot;
 }