Make CPDF_Parser::GetTrailer const method.

Use own copy of encryption dictionary within CPDF_Parser,
to prevent modification of original trailer.

Change-Id: I6246b872d431b94411fcec694c5176f8d85dfe26
Reviewed-on: https://pdfium-review.googlesource.com/35450
Commit-Queue: Art Snake <art-snake@yandex-team.ru>
Reviewed-by: Lei Zhang <thestig@chromium.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/core/fpdfapi/parser/cpdf_parser.h b/core/fpdfapi/parser/cpdf_parser.h
index c998063394..e9b2a760ea 100644
--- a/core/fpdfapi/parser/cpdf_parser.h
+++ b/core/fpdfapi/parser/cpdf_parser.h
@@ -64,7 +64,7 @@ class CPDF_Parser {
   void SetPassword(const char* password) { m_Password = password; }
   ByteString GetPassword() const { return m_Password; }
 
-  CPDF_Dictionary* GetTrailer() const;
+  const CPDF_Dictionary* GetTrailer() const;
 
   // Returns a new trailer which combines the last read trailer with the /Root
   // and /Info from previous ones.
@@ -78,7 +78,7 @@ class CPDF_Parser {
   const CPDF_Array* GetIDArray() const;
   CPDF_Dictionary* GetRoot() const;
 
-  CPDF_Dictionary* GetEncryptDict() const { return m_pEncryptDict.Get(); }
+  CPDF_Dictionary* GetEncryptDict() const { return m_pEncryptDict.get(); }
 
   std::unique_ptr<CPDF_Object> ParseIndirectObject(uint32_t objnum);
 
@@ -159,7 +159,7 @@ class CPDF_Parser {
   Error LoadLinearizedMainXRefTable();
   const CPDF_ObjectStream* GetObjectStream(uint32_t object_number);
   std::unique_ptr<CPDF_LinearizedHeader> ParseLinearizedHeader();
-  void SetEncryptDictionary(CPDF_Dictionary* pDict);
+  void SetEncryptDictionary(const CPDF_Dictionary* pDict);
   void ShrinkObjectMap(uint32_t size);
   // A simple check whether the cross reference table matches with
   // the objects.
@@ -190,7 +190,7 @@ class CPDF_Parser {
   // m_TrailerData must be destroyed after m_pSecurityHandler due to the
   // ownership of the ID array data.
   std::unique_ptr<TrailerData> m_TrailerData;
-  UnownedPtr<CPDF_Dictionary> m_pEncryptDict;
+  std::unique_ptr<CPDF_Dictionary> m_pEncryptDict;
   FX_FILESIZE m_LastXRefOffset;
   std::unique_ptr<CPDF_SecurityHandler> m_pSecurityHandler;
   ByteString m_Password;