Distinguish between user and owner passwords.

core/fpdfapi/fpdf_parser/cpdf_document.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
 
 #include <set>
 
@@ skipping 701 matching lines @@
     return 0;
 
   if (!pPages->KeyExist("Kids"))
     return 1;
 
   std::set<CPDF_Dictionary*> visited_pages;
   visited_pages.insert(pPages);
   return CountPages(pPages, &visited_pages);
 }
 
-uint32_t CPDF_Document::GetUserPermissions(FX_BOOL bCheckRevision) const {
-  return m_pParser ? m_pParser->GetPermissions(bCheckRevision)
-                   : static_cast<uint32_t>(-1);
+uint32_t CPDF_Document::GetUserPermissions() const {
+  // https://bugs.chromium.org/p/pdfium/issues/detail?id=499
+  if (!m_pParser) {
+#ifndef PDF_ENABLE_XFA
+    return 0;
+#else  // PDF_ENABLE_XFA
+    return 0xFFFFFFFF;
+#endif
+  }
+  return m_pParser->GetPermissions();
 }
 
 FX_BOOL CPDF_Document::IsFormStream(uint32_t objnum, FX_BOOL& bForm) const {
   auto it = m_IndirectObjs.find(objnum);
   if (it != m_IndirectObjs.end()) {
     CPDF_Stream* pStream = it->second->AsStream();
     bForm = pStream && pStream->GetDict()->GetStringBy("Subtype") == "Form";
     return TRUE;
   }
   if (!m_pParser) {
@@ skipping 705 matching lines @@
     }
   }
   pFontDesc->SetAtInteger("StemV", fStemV);
   AddIndirectObject(pFontDesc);
   pFontDict->SetAtReference("FontDescriptor", this, pFontDesc);
   CFRelease(traits);
   CFRelease(languages);
   return LoadFont(pBaseDict);
 }
 #endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_