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 .

3 files changed, 16 insertions, 27 deletions

diff --git a/core/src/fpdfdoc/doc_basic.cpp b/core/src/fpdfdoc/doc_basic.cpp
index e3b630862c..bbf51139ad 100644
--- a/core/src/fpdfdoc/doc_basic.cpp
+++ b/core/src/fpdfdoc/doc_basic.cpp
@@ -11,15 +11,12 @@ int CPDF_Dest::GetPageIndex(CPDF_Document* pDoc) {
     return 0;
   }
   CPDF_Object* pPage = ((CPDF_Array*)m_pObj)->GetElementValue(0);
-  if (pPage == NULL) {
+  if (!pPage)
     return 0;
-  }
-  if (pPage->GetType() == PDFOBJ_NUMBER) {
+  if (pPage->IsNumber())
     return pPage->GetInteger();
-  }
-  if (!pPage->IsDictionary()) {
+  if (!pPage->IsDictionary())
     return 0;
-  }
   return pDoc->GetPageIndex(pPage->GetObjNum());
 }
 FX_DWORD CPDF_Dest::GetPageObjNum() {
@@ -27,15 +24,12 @@ FX_DWORD CPDF_Dest::GetPageObjNum() {
     return 0;
   }
   CPDF_Object* pPage = ((CPDF_Array*)m_pObj)->GetElementValue(0);
-  if (pPage == NULL) {
+  if (!pPage)
     return 0;
-  }
-  if (pPage->GetType() == PDFOBJ_NUMBER) {
+  if (pPage->IsNumber())
     return pPage->GetInteger();
-  }
-  if (pPage->IsDictionary()) {
+  if (pPage->IsDictionary())
     return pPage->GetObjNum();
-  }
   return 0;
 }
 const FX_CHAR* g_sZoomModes[] = {"XYZ",  "Fit",   "FitH",  "FitV", "FitR",
diff --git a/core/src/fpdfdoc/doc_formfield.cpp b/core/src/fpdfdoc/doc_formfield.cpp
index 8c99cf4a78..aafc17f65c 100644
--- a/core/src/fpdfdoc/doc_formfield.cpp
+++ b/core/src/fpdfdoc/doc_formfield.cpp
@@ -431,7 +431,7 @@ int CPDF_FormField::CountSelectedItems() {
     }
     return 1;
   }
-  if (pValue->GetType() == PDFOBJ_NUMBER) {
+  if (pValue->IsNumber()) {
     if (pValue->GetString().IsEmpty()) {
       return 0;
     }
@@ -450,9 +450,9 @@ int CPDF_FormField::GetSelectedIndex(int index) {
       return -1;
     }
   }
-  if (pValue->GetType() == PDFOBJ_NUMBER) {
+  if (pValue->IsNumber())
     return pValue->GetInteger();
-  }
+
   CFX_WideString sel_value;
   if (pValue->GetType() == PDFOBJ_STRING) {
     if (index != 0) {
@@ -541,7 +541,7 @@ FX_BOOL CPDF_FormField::IsItemSelected(int index) {
     }
     return FALSE;
   }
-  if (pValue->GetType() == PDFOBJ_NUMBER) {
+  if (pValue->IsNumber()) {
     if (pValue->GetString().IsEmpty()) {
       return FALSE;
     }
diff --git a/core/src/fpdfdoc/doc_tagged.cpp b/core/src/fpdfdoc/doc_tagged.cpp
index fb3a05d59f..d9d439f730 100644
--- a/core/src/fpdfdoc/doc_tagged.cpp
+++ b/core/src/fpdfdoc/doc_tagged.cpp
@@ -254,10 +254,10 @@ void CPDF_StructElementImpl::LoadKid(FX_DWORD PageObjNum,
                                      CPDF_Object* pKidObj,
                                      CPDF_StructKid* pKid) {
   pKid->m_Type = CPDF_StructKid::Invalid;
-  if (pKidObj == NULL) {
+  if (!pKidObj)
     return;
-  }
-  if (pKidObj->GetType() == PDFOBJ_NUMBER) {
+
+  if (pKidObj->IsNumber()) {
     if (m_pTree->m_pPage && m_pTree->m_pPage->GetObjNum() != PageObjNum) {
       return;
     }
@@ -266,6 +266,7 @@ void CPDF_StructElementImpl::LoadKid(FX_DWORD PageObjNum,
     pKid->m_PageContent.m_PageObjNum = PageObjNum;
     return;
   }
+
   CPDF_Dictionary* pKidDict = pKidObj->AsDictionary();
   if (!pKidDict)
     return;
@@ -441,10 +442,7 @@ FX_FLOAT CPDF_StructElementImpl::GetNumber(const CFX_ByteStringC& owner,
                                            FX_BOOL bInheritable,
                                            int subindex) {
   CPDF_Object* pAttr = GetAttr(owner, name, bInheritable, subindex);
-  if (pAttr == NULL || pAttr->GetType() != PDFOBJ_NUMBER) {
-    return default_value;
-  }
-  return pAttr->GetNumber();
+  return ToNumber(pAttr) ? pAttr->GetNumber() : default_value;
 }
 int CPDF_StructElementImpl::GetInteger(const CFX_ByteStringC& owner,
                                        const CFX_ByteStringC& name,
@@ -452,8 +450,5 @@ int CPDF_StructElementImpl::GetInteger(const CFX_ByteStringC& owner,
                                        FX_BOOL bInheritable,
                                        int subindex) {
   CPDF_Object* pAttr = GetAttr(owner, name, bInheritable, subindex);
-  if (pAttr == NULL || pAttr->GetType() != PDFOBJ_NUMBER) {
-    return default_value;
-  }
-  return pAttr->GetInteger();
+  return ToNumber(pAttr) ? pAttr->GetInteger() : default_value;
 }