Fix encryption dictionary owning.

Return encryption dictionary as const reference
from CPDF_Parser.

Create a copy in CPDF_Creator if needed.

Change-Id: I270f71d307d818fba7f65ebe379f5942ae816934
Reviewed-on: https://pdfium-review.googlesource.com/38390
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Art Snake <art-snake@yandex-team.ru>

1 files changed, 7 insertions, 1 deletions

diff --git a/core/fpdfapi/parser/cpdf_security_handler.cpp b/core/fpdfapi/parser/cpdf_security_handler.cpp
index eeba53ef34..caa82a9ddd 100644
--- a/core/fpdfapi/parser/cpdf_security_handler.cpp
+++ b/core/fpdfapi/parser/cpdf_security_handler.cpp
@@ -119,7 +119,13 @@ bool CPDF_SecurityHandler::CheckSecurity(const ByteString& password) {
 }
 
 uint32_t CPDF_SecurityHandler::GetPermissions() const {
-  return m_bOwnerUnlocked ? 0xFFFFFFFF : m_Permissions;
+  uint32_t dwPermission = m_bOwnerUnlocked ? 0xFFFFFFFF : m_Permissions;
+  if (m_pEncryptDict && m_pEncryptDict->GetStringFor("Filter") == "Standard") {
+    // See PDF Reference 1.7, page 123, table 3.20.
+    dwPermission &= 0xFFFFFFFC;
+    dwPermission |= 0xFFFFF0C0;
+  }
+  return dwPermission;
 }
 
 static bool LoadCryptInfo(const CPDF_Dictionary* pEncryptDict,