Make CPDF_Document::m_pRootDict an UnownedPtr<>.

In turn, this requires making some of the tests use an indirect
root dictionary so as to satisfy the lifetime requirements.

Change-Id: Ibdbe294a76200d4486134e5848c169a6c2d802bf
Reviewed-on: https://pdfium-review.googlesource.com/36110
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

2 files changed, 13 insertions, 26 deletions

diff --git a/core/fpdfapi/parser/cpdf_document.h b/core/fpdfapi/parser/cpdf_document.h
index 94d20504c5..db659b38c8 100644
--- a/core/fpdfapi/parser/cpdf_document.h
+++ b/core/fpdfapi/parser/cpdf_document.h
@@ -61,8 +61,7 @@ class CPDF_Document : public CPDF_IndirectObjectHolder {
   }
 
   CPDF_Parser* GetParser() const { return m_pParser.get(); }
-  const CPDF_Dictionary* GetRoot() const { return m_pRootDict; }
-  CPDF_Dictionary* GetRoot() { return m_pRootDict; }
+  CPDF_Dictionary* GetRoot() const { return m_pRootDict.Get(); }
   CPDF_Dictionary* GetInfo();
 
   void DeletePage(int iPage);
@@ -148,10 +147,7 @@ class CPDF_Document : public CPDF_IndirectObjectHolder {
   void ResetTraversal();
 
   std::unique_ptr<CPDF_Parser> m_pParser;
-
-  // TODO(tsepez): figure out why tests break if this is an UnownedPtr.
-  CPDF_Dictionary* m_pRootDict;  // Not owned.
-
+  UnownedPtr<CPDF_Dictionary> m_pRootDict;
   UnownedPtr<CPDF_Dictionary> m_pInfoDict;
 
   // Vector of pairs to know current position in the page tree. The index in the
diff --git a/core/fpdfapi/parser/cpdf_document_unittest.cpp b/core/fpdfapi/parser/cpdf_document_unittest.cpp
index f06a7f42d3..fa52d3bc7f 100644
--- a/core/fpdfapi/parser/cpdf_document_unittest.cpp
+++ b/core/fpdfapi/parser/cpdf_document_unittest.cpp
@@ -87,20 +87,16 @@ class CPDF_TestDocumentForPages : public CPDF_Document {
     CPDF_Dictionary* pagesDict =
         CreatePageTreeNode(std::move(allPages), this, kNumTestPages);
 
-    m_pOwnedRootDict = pdfium::MakeUnique<CPDF_Dictionary>();
-    m_pOwnedRootDict->SetNewFor<CPDF_Reference>("Pages", this,
-                                                pagesDict->GetObjNum());
-    m_pRootDict = m_pOwnedRootDict.get();
+    m_pRootDict = NewIndirect<CPDF_Dictionary>();
+    m_pRootDict->SetNewFor<CPDF_Reference>("Pages", this,
+                                           pagesDict->GetObjNum());
     m_PageList.resize(kNumTestPages);
   }
 
   void SetTreeSize(int size) {
-    m_pOwnedRootDict->SetNewFor<CPDF_Number>("Count", size);
+    m_pRootDict->SetNewFor<CPDF_Number>("Count", size);
     m_PageList.resize(size);
   }
-
- private:
-  std::unique_ptr<CPDF_Dictionary> m_pOwnedRootDict;
 };
 
 class CPDF_TestDocumentWithPageWithoutPageNum : public CPDF_Document {
@@ -116,17 +112,15 @@ class CPDF_TestDocumentWithPageWithoutPageNum : public CPDF_Document {
     inlined_page_ = allPages->Add(CreateNumberedPage(2));
     CPDF_Dictionary* pagesDict =
         CreatePageTreeNode(std::move(allPages), this, 3);
-    m_pOwnedRootDict = pdfium::MakeUnique<CPDF_Dictionary>();
-    m_pOwnedRootDict->SetNewFor<CPDF_Reference>("Pages", this,
-                                                pagesDict->GetObjNum());
-    m_pRootDict = m_pOwnedRootDict.get();
+    m_pRootDict = NewIndirect<CPDF_Dictionary>();
+    m_pRootDict->SetNewFor<CPDF_Reference>("Pages", this,
+                                           pagesDict->GetObjNum());
     m_PageList.resize(3);
   }
 
   const CPDF_Object* inlined_page() const { return inlined_page_; }
 
  private:
-  std::unique_ptr<CPDF_Dictionary> m_pOwnedRootDict;
   const CPDF_Object* inlined_page_;
 };
 
@@ -143,15 +137,12 @@ class CPDF_TestDocPagesWithoutKids : public CPDF_Document {
     pagesDict->SetNewFor<CPDF_Name>("Type", "Pages");
     pagesDict->SetNewFor<CPDF_Number>("Count", 3);
     m_PageList.resize(10);
-    m_pOwnedRootDict = pdfium::MakeUnique<CPDF_Dictionary>();
-    m_pOwnedRootDict->SetNewFor<CPDF_Reference>("Pages", this,
-                                                pagesDict->GetObjNum());
-    m_pRootDict = m_pOwnedRootDict.get();
+    m_pRootDict = NewIndirect<CPDF_Dictionary>();
+    m_pRootDict->SetNewFor<CPDF_Reference>("Pages", this,
+                                           pagesDict->GetObjNum());
   }
-
- private:
-  std::unique_ptr<CPDF_Dictionary> m_pOwnedRootDict;
 };
+
 }  // namespace
 
 class cpdf_document_test : public testing::Test {