Add type cast definitions for CPDF_Name.

This Cl adds ToName, CPDF_Object::AsName and CPDF_Object::IsName and
updates the src to use them as needed.

BUG=pdfium:201
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1417823005 .

1 files changed, 12 insertions, 0 deletions

diff --git a/core/include/fpdfapi/fpdf_objects.h b/core/include/fpdfapi/fpdf_objects.h
index c3e5df4118..2404774dcb 100644
--- a/core/include/fpdfapi/fpdf_objects.h
+++ b/core/include/fpdfapi/fpdf_objects.h
@@ -16,6 +16,7 @@ class CPDF_CryptoHandler;
 class CPDF_Dictionary;
 class CPDF_Document;
 class CPDF_IndirectObjects;
+class CPDF_Name;
 class CPDF_Null;
 class CPDF_Number;
 class CPDF_Parser;
@@ -80,6 +81,7 @@ class CPDF_Object {
 
   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; }
 
@@ -89,6 +91,9 @@ class CPDF_Object {
   CPDF_Dictionary* AsDictionary();
   const CPDF_Dictionary* AsDictionary() const;
 
+  CPDF_Name* AsName();
+  const CPDF_Name* AsName() const;
+
   CPDF_Number* AsNumber();
   const CPDF_Number* AsNumber() const;
 
@@ -259,6 +264,13 @@ class CPDF_Name : public CPDF_Object {
   CFX_ByteString m_Name;
   friend class CPDF_Object;
 };
+inline CPDF_Name* ToName(CPDF_Object* obj) {
+  return obj ? obj->AsName() : nullptr;
+}
+inline const CPDF_Name* ToName(const CPDF_Object* obj) {
+  return obj ? obj->AsName() : nullptr;
+}
+
 class CPDF_Array : public CPDF_Object {
  public:
   static CPDF_Array* Create() { return new CPDF_Array(); }