From 1c88166e517d294141e08a45c81ce3c2d9fddaab Mon Sep 17 00:00:00 2001
From: Lei Zhang <thestig@chromium.org>
Date: Mon, 1 Oct 2018 19:51:11 +0000
Subject: Remove checks for impossible situation in CPDFXFA_Context.

CPDFXFA_Context should always have a valid doc.

Change-Id: Ifb547281f1e4f2741e2d741438b9a3ece71f9e99
Reviewed-on: https://pdfium-review.googlesource.com/43212
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
---
 fpdfsdk/fpdfxfa/cpdfxfa_context.cpp | 28 +++++++---------------------
 fpdfsdk/fpdfxfa/cpdfxfa_context.h   |  2 +-
 2 files changed, 8 insertions(+), 22 deletions(-)

diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_context.cpp b/fpdfsdk/fpdfxfa/cpdfxfa_context.cpp
index f2bfff6fa6..2e1abb859f 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_context.cpp
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_context.cpp
@@ -19,7 +19,6 @@
 #include "fxjs/cjs_runtime.h"
 #include "fxjs/ijs_runtime.h"
 #include "public/fpdf_formfill.h"
-#include "third_party/base/compiler_specific.h"
 #include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fgas/font/cfgas_defaultfontmanager.h"
@@ -31,11 +30,6 @@
 #include "xfa/fxfa/cxfa_ffwidgethandler.h"
 #include "xfa/fxfa/cxfa_fontmgr.h"
 
-#ifndef _WIN32
-extern void SetLastError(int err);
-extern int GetLastError();
-#endif
-
 namespace {
 
 bool IsValidAlertButton(int type) {
@@ -58,7 +52,9 @@ bool IsValidAlertIcon(int type) {
 CPDFXFA_Context::CPDFXFA_Context(CPDF_Document* pPDFDoc)
     : m_pPDFDoc(pPDFDoc),
       m_pXFAApp(pdfium::MakeUnique<CXFA_FFApp>(this)),
-      m_DocEnv(this) {}
+      m_DocEnv(this) {
+  ASSERT(m_pPDFDoc);
+}
 
 CPDFXFA_Context::~CPDFXFA_Context() {
   m_nLoadStatus = FXFA_LOADSTATUS_CLOSING;
@@ -109,9 +105,6 @@ bool CPDFXFA_Context::LoadXFADoc() {
   m_nLoadStatus = FXFA_LOADSTATUS_LOADING;
   m_XFAPageList.clear();
 
-  if (!m_pPDFDoc)
-    return false;
-
   CXFA_FFApp* pApp = GetXFAApp();
   if (!pApp)
     return false;
@@ -148,21 +141,15 @@ bool CPDFXFA_Context::LoadXFADoc() {
 }
 
 int CPDFXFA_Context::GetPageCount() const {
-  if (!m_pPDFDoc && !m_pXFADoc)
-    return 0;
-
   switch (m_FormType) {
     case FormType::kNone:
     case FormType::kAcroForm:
     case FormType::kXFAForeground:
-      if (m_pPDFDoc)
-        return m_pPDFDoc->GetPageCount();
-      FALLTHROUGH;
+      return m_pPDFDoc->GetPageCount();
     case FormType::kXFAFull:
-      if (m_pXFADoc)
-        return m_pXFADocView->CountPageViews();
-      break;
+      return m_pXFADoc ? m_pXFADocView->CountPageViews() : 0;
   }
+  NOTREACHED();
   return 0;
 }
 
@@ -214,8 +201,7 @@ void CPDFXFA_Context::DeletePage(int page_index) {
   // Delete from the document first because, if GetPage was never called for
   // this |page_index| then |m_XFAPageList| may have size < |page_index| even
   // if it's a valid page in the document.
-  if (m_pPDFDoc)
-    m_pPDFDoc->DeletePage(page_index);
+  m_pPDFDoc->DeletePage(page_index);
 
   if (pdfium::IndexInBounds(m_XFAPageList, page_index))
     m_XFAPageList[page_index].Reset();
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_context.h b/fpdfsdk/fpdfxfa/cpdfxfa_context.h
index 1315375b58..92592a208e 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_context.h
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_context.h
@@ -111,7 +111,7 @@ class CPDFXFA_Context final : public CPDF_Document::Extension,
   void CloseXFADoc();
 
   FormType m_FormType = FormType::kNone;
-  UnownedPtr<CPDF_Document> m_pPDFDoc;
+  UnownedPtr<CPDF_Document> const m_pPDFDoc;
   std::unique_ptr<CXFA_FFDoc> m_pXFADoc;
   Observable<CPDFSDK_FormFillEnvironment>::ObservedPtr m_pFormFillEnv;
   UnownedPtr<CXFA_FFDocView> m_pXFADocView;
-- 
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