Merge to XFA: Add type cast definitions for CPDF_Stream.

fpdfsdk/src/fpdf_transformpage.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_transformpage.h"
 #include "../include/fsdk_define.h"
 
 namespace {
@@ skipping 126 matching lines @@
     pContentArray->AddReference(pDoc, pEndStream);
   } else if (pContentObj && pContentObj->GetType() == PDFOBJ_REFERENCE) {
     CPDF_Reference* pReference = (CPDF_Reference*)pContentObj;
     CPDF_Object* pDirectObj = pReference->GetDirect();
     if (pDirectObj) {
       if (CPDF_Array* pArray = pDirectObj->AsArray()) {
         pContentArray = pArray;
         CPDF_Reference* pRef = new CPDF_Reference(pDoc, pStream->GetObjNum());
         pContentArray->InsertAt(0, pRef);
         pContentArray->AddReference(pDoc, pEndStream);
-      } else if (pDirectObj->GetType() == PDFOBJ_STREAM) {
+      } else if (pDirectObj->IsStream()) {
         pContentArray = new CPDF_Array();
         pContentArray->AddReference(pDoc, pStream->GetObjNum());
         pContentArray->AddReference(pDoc, pDirectObj->GetObjNum());
         pContentArray->AddReference(pDoc, pEndStream);
         pPageDic->SetAtReference("Contents", pDoc,
                                  pDoc->AddIndirectObject(pContentArray));
       }
     }
   }
 
   // Need to transform the patterns as well.
   CPDF_Dictionary* pRes = pPageDic->GetDict(FX_BSTRC("Resources"));
   if (pRes) {
     CPDF_Dictionary* pPattenDict = pRes->GetDict(FX_BSTRC("Pattern"));
     if (pPattenDict) {
       FX_POSITION pos = pPattenDict->GetStartPos();
       while (pos) {
-        CPDF_Dictionary* pDict = NULL;
+        CPDF_Dictionary* pDict = nullptr;
         CFX_ByteString key;
         CPDF_Object* pObj = pPattenDict->GetNextElement(pos, key);
         if (pObj->GetType() == PDFOBJ_REFERENCE)
           pObj = pObj->GetDirect();
-        if (pObj->IsDictionary()) {
+
+        if (pObj->IsDictionary())
           pDict = pObj->AsDictionary();
-        } else if (pObj->GetType() == PDFOBJ_STREAM) {
-          pDict = ((CPDF_Stream*)pObj)->GetDict();
-        } else
+        else if (CPDF_Stream* pStream = pObj->AsStream())
+          pDict = pStream->GetDict();
+        else
           continue;
 
         CFX_AffineMatrix m = pDict->GetMatrix(FX_BSTRC("Matrix"));
         CFX_AffineMatrix t = *(CFX_AffineMatrix*)matrix;
         m.Concat(t);
         pDict->SetAtMatrix(FX_BSTRC("Matrix"), m);
       }
     }
   }
 
@@ skipping 121 matching lines @@
     CPDF_Reference* pRef = new CPDF_Reference(pDoc, pStream->GetObjNum());
     pContentArray->InsertAt(0, pRef);
   } else if (pContentObj && pContentObj->GetType() == PDFOBJ_REFERENCE) {
     CPDF_Reference* pReference = (CPDF_Reference*)pContentObj;
     CPDF_Object* pDirectObj = pReference->GetDirect();
     if (pDirectObj) {
       if (CPDF_Array* pArray = pDirectObj->AsArray()) {
         pContentArray = pArray;
         CPDF_Reference* pRef = new CPDF_Reference(pDoc, pStream->GetObjNum());
         pContentArray->InsertAt(0, pRef);
-      } else if (pDirectObj->GetType() == PDFOBJ_STREAM) {
+      } else if (pDirectObj->IsStream()) {
         pContentArray = new CPDF_Array();
         pContentArray->AddReference(pDoc, pStream->GetObjNum());
         pContentArray->AddReference(pDoc, pDirectObj->GetObjNum());
         pPageDic->SetAtReference("Contents", pDoc,
                                  pDoc->AddIndirectObject(pContentArray));
       }
     }
   }
 }