Add type cast definitions for CPDF_Stream.

core/src/fpdfapi/fpdf_page/fpdf_page_parser.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 "../../../include/fpdfapi/fpdf_page.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_serial.h"
 #include "pageint.h"
@@ skipping 698 matching lines @@
         }
       }
     }
     FX_BOOL bForm;
     if (m_pDocument->IsFormStream(((CPDF_Reference*)pRes)->GetRefObjNum(),
                                   bForm) &&
         !bForm) {
       return;
     }
   }
-  CPDF_Stream* pXObject =
-      (CPDF_Stream*)FindResourceObj(FX_BSTRC("XObject"), name);
-  if (pXObject == NULL || pXObject->GetType() != PDFOBJ_STREAM) {
+  CPDF_Stream* pXObject = ToStream(FindResourceObj(FX_BSTRC("XObject"), name));
+  if (!pXObject) {
     m_bResourceMissing = TRUE;
     return;
   }
+
   CFX_ByteStringC type =
       pXObject->GetDict()
           ? pXObject->GetDict()->GetConstString(FX_BSTRC("Subtype"))
           : CFX_ByteStringC();
   if (type == FX_BSTRC("Image")) {
     if (m_Options.m_bTextOnly) {
       return;
     }
     CPDF_ImageObject* pObj = AddImage(pXObject, NULL, FALSE);
     m_LastImageName = name;
@@ skipping 409 matching lines @@
   SetGraphicStates(pObj, FALSE, FALSE, FALSE);
   pObj->m_Matrix = m_pCurStates->m_CTM;
   pObj->m_Matrix.Concat(m_mtContentToUser);
   CFX_FloatRect bbox;
   if (!pObj->m_ClipPath.IsNull()) {
     bbox = pObj->m_ClipPath.GetClipBox();
   } else {
     bbox = m_BBox;
   }
   if (pShading->m_ShadingType >= 4) {
-    bbox.Intersect(_GetShadingBBox((CPDF_Stream*)pShading->m_pShadingObj,
+    bbox.Intersect(_GetShadingBBox(ToStream(pShading->m_pShadingObj),
                                    pShading->m_ShadingType, &pObj->m_Matrix,
                                    pShading->m_pFunctions, pShading->m_nFuncs,
                                    pShading->m_pCS));
   }
   pObj->m_Left = bbox.left;
   pObj->m_Right = bbox.right;
   pObj->m_Top = bbox.top;
   pObj->m_Bottom = bbox.bottom;
   m_pObjectList->m_ObjectList.AddTail(pObj);
 }
@@ skipping 90 matching lines @@
   if (pCSObj == NULL) {
     m_bResourceMissing = TRUE;
     return NULL;
   }
   return m_pDocument->LoadColorSpace(pCSObj);
 }
 CPDF_Pattern* CPDF_StreamContentParser::FindPattern(const CFX_ByteString& name,
                                                     FX_BOOL bShading) {
   CPDF_Object* pPattern = FindResourceObj(
       bShading ? FX_BSTRC("Shading") : FX_BSTRC("Pattern"), name);
-  if (pPattern == NULL ||
-      (!pPattern->IsDictionary() && pPattern->GetType() != PDFOBJ_STREAM)) {
+  if (!pPattern || (!pPattern->IsDictionary() && !pPattern->IsStream())) {
     m_bResourceMissing = TRUE;
     return NULL;
   }
   return m_pDocument->LoadPattern(pPattern, bShading,
                                   &m_pCurStates->m_ParentMatrix);
 }
 void CPDF_StreamContentParser::ConvertTextSpace(FX_FLOAT& x, FX_FLOAT& y) {
   m_pCurStates->m_TextMatrix.Transform(x, y, x, y);
   ConvertUserSpace(x, y);
 }
@@ skipping 310 matching lines @@
         buf.AppendChar((char)code);
       }
       bFirst = !bFirst;
     }
   }
   if (!bFirst) {
     buf.AppendChar((char)code);
   }
   return buf.GetByteString();
 }