Make CPDF_Object::GetString() a virtual method.

fpdfsdk/src/fpdf_flatten.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 "../../public/fpdf_flatten.h"
 #include "../include/fsdk_define.h"
 
 typedef CFX_ArrayTemplate<CPDF_Dictionary*> CPDF_ObjectArray;
@@ skipping 84 matching lines @@
         return FLATTEN_NOTHINGTODO;
 
     FX_DWORD dwSize = pAnnots->GetCount();
     for (int i = 0; i < (int)dwSize; i++)
     {
         CPDF_Object* pObj = pAnnots->GetElementValue(i);
         if (!pObj || pObj->GetType() != PDFOBJ_DICTIONARY)
             continue;
 
         CPDF_Dictionary* pAnnotDic = (CPDF_Dictionary*)pObj;
-        CFX_ByteString sSubtype = pAnnotDic->GetString("Subtype");
+        CFX_ByteString sSubtype = pAnnotDic->GetStringAt("Subtype");
         if (sSubtype == "Popup")
             continue;
 
         int nAnnotFlag = pAnnotDic->GetInteger("F");
         if (nAnnotFlag & ANNOTFLAG_HIDDEN)
             continue;
 
         if(nUsage == FLAT_NORMALDISPLAY)
         {
             if (nAnnotFlag & ANNOTFLAG_INVISIBLE)
@@ skipping 322 matching lines @@
         }
 
         for (int i = 0; i < nStreams; i++)
         {
                 CPDF_Dictionary* pAnnotDic = ObjectArray.GetAt(i);
                 if (!pAnnotDic)continue;
 
                 CPDF_Rect rcAnnot = pAnnotDic->GetRect("Rect");
                 rcAnnot.Normalize();
 
-                CFX_ByteString sAnnotState = pAnnotDic->GetString("AS");
+                CFX_ByteString sAnnotState = pAnnotDic->GetStringAt("AS");
                 CPDF_Dictionary* pAnnotAP = pAnnotDic->GetDict("AP");
                 if (!pAnnotAP)continue;
 
                 CPDF_Stream* pAPStream = pAnnotAP->GetStream("N");
                 if (!pAPStream)
                 {
                         CPDF_Dictionary* pAPDic = pAnnotAP->GetDict("N");
                         if (!pAPDic)continue;
 
                         if (!sAnnotState.IsEmpty())
@@ skipping 81 matching lines @@
 
                 pNewXObject->SetData((const uint8_t*)sStream, sStream.GetLength(), FALSE, FALSE);
         }
         pPageDict->RemoveAt( "Annots" );
 
         ObjectArray.RemoveAll();
         RectArray.RemoveAll();
 
         return FLATTEN_SUCCESS;
 }