Unify some code

core/fpdfapi/parser/cpdf_document.cpp

Index: core/fpdfapi/parser/cpdf_document.cpp
diff --git a/core/fpdfapi/parser/cpdf_document.cpp b/core/fpdfapi/parser/cpdf_document.cpp
index 1794288e62efe0784df83fd58e43dffbaed2925c..1fcdf291be64fe9d66a932c8f02a515f538ef115 100644
--- a/core/fpdfapi/parser/cpdf_document.cpp
+++ b/core/fpdfapi/parser/cpdf_document.cpp
@@ -17,6 +17,7 @@
 #include "core/fpdfapi/page/pageint.h"
 #include "core/fpdfapi/parser/cpdf_array.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_linearized.h"
 #include "core/fpdfapi/parser/cpdf_number.h"
 #include "core/fpdfapi/parser/cpdf_parser.h"
 #include "core/fpdfapi/parser/cpdf_reference.h"
@@ -454,23 +455,13 @@ void CPDF_Document::LoadDoc() {
   m_PageList.SetSize(RetrievePageCount());
 }
 
-void CPDF_Document::LoadLinearizedDoc(CPDF_Dictionary* pLinearizationParams) {
+void CPDF_Document::LoadLinearizedDoc(
+    const CPDF_Linearized* pLinearizationParams) {
   m_bLinearized = true;
   LoadDocInternal();
-
-  uint32_t dwPageCount = 0;
-  CPDF_Object* pCount = pLinearizationParams->GetObjectFor("N");
-  if (ToNumber(pCount))
-    dwPageCount = pCount->GetInteger();
-  m_PageList.SetSize(dwPageCount);
-
-  CPDF_Object* pNo = pLinearizationParams->GetObjectFor("P");
-  if (ToNumber(pNo))
-    m_iFirstPageNo = pNo->GetInteger();
-
-  CPDF_Object* pObjNum = pLinearizationParams->GetObjectFor("O");
-  if (ToNumber(pObjNum))
-    m_dwFirstPageObjNum = pObjNum->GetInteger();
+  m_PageList.SetSize(pLinearizationParams->GetPageCount());
+  m_iFirstPageNo = pLinearizationParams->GetFirstPageNo();
+  m_dwFirstPageObjNum = pLinearizationParams->GetFirstPageObjNum();
 }
 
 void CPDF_Document::LoadPages() {