Add type cast definitions for CPDF_Array.

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 91 matching lines @@
   bsClipping.Format("%f %f %f %f re W* n ", rect.left, rect.bottom,
                     rect.Width(), rect.Height());
   textBuf << bsClipping;
 
   CFX_ByteString bsMatix;
   bsMatix.Format("%f %f %f %f %f %f cm ", matrix->a, matrix->b, matrix->c,
                  matrix->d, matrix->e, matrix->f);
   textBuf << bsMatix;
 
   CPDF_Dictionary* pPageDic = pPage->m_pFormDict;
-  CPDF_Object* pContentObj = pPageDic ? pPageDic->GetElement("Contents") : NULL;
+  CPDF_Object* pContentObj =
+      pPageDic ? pPageDic->GetElement("Contents") : nullptr;
   if (!pContentObj)
-    pContentObj = pPageDic ? pPageDic->GetArray("Contents") : NULL;
+    pContentObj = pPageDic ? pPageDic->GetArray("Contents") : nullptr;
   if (!pContentObj)
     return FALSE;
 
   CPDF_Dictionary* pDic = new CPDF_Dictionary;
-  CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, pDic);
+  CPDF_Stream* pStream = new CPDF_Stream(nullptr, 0, pDic);
   pStream->SetData(textBuf.GetBuffer(), textBuf.GetSize(), FALSE, FALSE);
   CPDF_Document* pDoc = pPage->m_pDocument;
   if (!pDoc)
     return FALSE;
   pDoc->AddIndirectObject(pStream);
 
   pDic = new CPDF_Dictionary;
-  CPDF_Stream* pEndStream = new CPDF_Stream(NULL, 0, pDic);
+  CPDF_Stream* pEndStream = new CPDF_Stream(nullptr, 0, pDic);
   pEndStream->SetData((const uint8_t*)" Q", 2, FALSE, FALSE);
   pDoc->AddIndirectObject(pEndStream);
 
-  CPDF_Array* pContentArray = NULL;
-  if (pContentObj && pContentObj->GetType() == PDFOBJ_ARRAY) {
-    pContentArray = (CPDF_Array*)pContentObj;
+  CPDF_Array* pContentArray = nullptr;
+  if (CPDF_Array* pArray = ToArray(pContentObj)) {
+    pContentArray = pArray;
     CPDF_Reference* pRef = new CPDF_Reference(pDoc, pStream->GetObjNum());
     pContentArray->InsertAt(0, pRef);
     pContentArray->AddReference(pDoc, pEndStream);
   } else if (pContentObj && pContentObj->GetType() == PDFOBJ_REFERENCE) {
     CPDF_Reference* pReference = (CPDF_Reference*)pContentObj;
     CPDF_Object* pDirectObj = pReference->GetDirect();
-    if (pDirectObj != NULL) {
-      if (pDirectObj->GetType() == PDFOBJ_ARRAY) {
-        pContentArray = (CPDF_Array*)pDirectObj;
+    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) {
         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));
@@ skipping 107 matching lines @@
   }
 }
 
 DLLEXPORT void STDCALL FPDFPage_InsertClipPath(FPDF_PAGE page,
                                                FPDF_CLIPPATH clipPath) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return;
 
   CPDF_Dictionary* pPageDic = pPage->m_pFormDict;
-  CPDF_Object* pContentObj = pPageDic ? pPageDic->GetElement("Contents") : NULL;
+  CPDF_Object* pContentObj =
+      pPageDic ? pPageDic->GetElement("Contents") : nullptr;
   if (!pContentObj)
-    pContentObj = pPageDic ? pPageDic->GetArray("Contents") : NULL;
+    pContentObj = pPageDic ? pPageDic->GetArray("Contents") : nullptr;
   if (!pContentObj)
     return;
 
   CFX_ByteTextBuf strClip;
   CPDF_ClipPath* pClipPath = (CPDF_ClipPath*)clipPath;
   FX_DWORD i;
   for (i = 0; i < pClipPath->GetPathCount(); i++) {
     CPDF_Path path = pClipPath->GetPath(i);
     int iClipType = pClipPath->GetClipType(i);
     if (path.GetPointCount() == 0) {
       // Empty clipping (totally clipped out)
       strClip << "0 0 m W n ";
     } else {
       OutputPath(strClip, path);
       if (iClipType == FXFILL_WINDING)
         strClip << "W n\n";
       else
         strClip << "W* n\n";
     }
   }
   CPDF_Dictionary* pDic = new CPDF_Dictionary;
-  CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, pDic);
+  CPDF_Stream* pStream = new CPDF_Stream(nullptr, 0, pDic);
   pStream->SetData(strClip.GetBuffer(), strClip.GetSize(), FALSE, FALSE);
   CPDF_Document* pDoc = pPage->m_pDocument;
   if (!pDoc)
     return;
   pDoc->AddIndirectObject(pStream);
 
-  CPDF_Array* pContentArray = NULL;
-  if (pContentObj && pContentObj->GetType() == PDFOBJ_ARRAY) {
-    pContentArray = (CPDF_Array*)pContentObj;
+  CPDF_Array* pContentArray = nullptr;
+  if (CPDF_Array* pArray = ToArray(pContentObj)) {
+    pContentArray = pArray;
     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 != NULL) {
-      if (pDirectObj->GetType() == PDFOBJ_ARRAY) {
-        pContentArray = (CPDF_Array*)pDirectObj;
+    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) {
         pContentArray = new CPDF_Array();
         pContentArray->AddReference(pDoc, pStream->GetObjNum());
         pContentArray->AddReference(pDoc, pDirectObj->GetObjNum());
         pPageDic->SetAtReference("Contents", pDoc,
                                  pDoc->AddIndirectObject(pContentArray));
       }
     }
   }
 }