Add type cast definitions for CPDF_Array.

core/include/fpdfapi/fpdf_objects.h

 // 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
 
 #ifndef CORE_INCLUDE_FPDFAPI_FPDF_OBJECTS_H_
 #define CORE_INCLUDE_FPDFAPI_FPDF_OBJECTS_H_
 
 #include "../fxcrt/fx_coordinates.h"
@@ skipping 61 matching lines @@
   CPDF_Array* GetArray() const;
 
   void SetString(const CFX_ByteString& str);
 
   void SetUnicodeText(const FX_WCHAR* pUnicodes, int len = -1);
 
   int GetDirectType() const;
 
   FX_BOOL IsModified() const { return FALSE; }
 
+  bool IsArray() const { return m_Type == PDFOBJ_ARRAY; }
   bool IsBoolean() const { return m_Type == PDFOBJ_BOOLEAN; }
   bool IsDictionary() const { return m_Type == PDFOBJ_DICTIONARY; }
   bool IsName() const { return m_Type == PDFOBJ_NAME; }
   bool IsNumber() const { return m_Type == PDFOBJ_NUMBER; }
   bool IsString() const { return m_Type == PDFOBJ_STRING; }
 
+  CPDF_Array* AsArray();
+  const CPDF_Array* AsArray() const;
+
   CPDF_Boolean* AsBoolean();
   const CPDF_Boolean* AsBoolean() const;
 
   CPDF_Dictionary* AsDictionary();
   const CPDF_Dictionary* AsDictionary() const;
 
   CPDF_Name* AsName();
   const CPDF_Name* AsName() const;
 
   CPDF_Number* AsNumber();
@@ skipping 236 matching lines @@
   void AddNumber16(FX_FLOAT value) { AddNumber(value); }
 
   FX_BOOL Identical(CPDF_Array* pOther) const;
 
  protected:
   ~CPDF_Array();
 
   CFX_PtrArray m_Objects;
   friend class CPDF_Object;
 };
+inline CPDF_Array* ToArray(CPDF_Object* obj) {
+  return obj ? obj->AsArray() : nullptr;
+}
+inline const CPDF_Array* ToArray(const CPDF_Object* obj) {
+  return obj ? obj->AsArray() : nullptr;
+}
+
 class CPDF_Dictionary : public CPDF_Object {
  public:
   static CPDF_Dictionary* Create() { return new CPDF_Dictionary(); }
 
   CPDF_Dictionary() : CPDF_Object(PDFOBJ_DICTIONARY) {}
 
   CPDF_Object* GetElement(const CFX_ByteStringC& key) const;
 
   CPDF_Object* GetElementValue(const CFX_ByteStringC& key) const;
 
@@ skipping 255 matching lines @@
 
  protected:
   CFX_MapPtrToPtr m_IndirectObjs;
 
   CPDF_Parser* m_pParser;
 
   FX_DWORD m_LastObjNum;
 };
 
 #endif  // CORE_INCLUDE_FPDFAPI_FPDF_OBJECTS_H_