Merge to XFA: Add type cast definitions for CPDF_Number.

This Cl adds ToNumber, CPDF_Object::AsNumber and CPDF_Object::IsNumber and
updates the src to use them as needed.

BUG=pdfium:201
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1410673005 .

(cherry picked from commit 83bf02dfb860a66d756434d194118dae572d04d3)

Review URL: https://codereview.chromium.org/1422583002 .

1 files changed, 5 insertions, 6 deletions

diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_document.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_document.cpp
index 7f7f3d195f..c98f8da56f 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_document.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_document.cpp
@@ -70,18 +70,17 @@ void CPDF_Document::LoadAsynDoc(CPDF_Dictionary* pLinearized) {
   }
   FX_DWORD dwPageCount = 0;
   CPDF_Object* pCount = pLinearized->GetElement(FX_BSTRC("N"));
-  if (pCount && pCount->GetType() == PDFOBJ_NUMBER) {
+  if (ToNumber(pCount))
     dwPageCount = pCount->GetInteger();
-  }
+
   m_PageList.SetSize(dwPageCount);
   CPDF_Object* pNo = pLinearized->GetElement(FX_BSTRC("P"));
-  if (pNo && pNo->GetType() == PDFOBJ_NUMBER) {
+  if (ToNumber(pNo))
     m_dwFirstPageNo = pNo->GetInteger();
-  }
+
   CPDF_Object* pObjNum = pLinearized->GetElement(FX_BSTRC("O"));
-  if (pObjNum && pObjNum->GetType() == PDFOBJ_NUMBER) {
+  if (ToNumber(pObjNum))
     m_dwFirstPageObjNum = pObjNum->GetInteger();
-  }
 }
 void CPDF_Document::LoadPages() {
   m_PageList.SetSize(_GetPageCount());