Distinguish between user and owner passwords.

fpdfsdk/fpdfview.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 "public/fpdfview.h"
 
 #include <memory>
 
@@ skipping 446 matching lines @@
     return FALSE;
 
   *fileVersion = pParser->GetFileVersion();
   return TRUE;
 }
 
 // jabdelmalek: changed return type from uint32_t to build on Linux (and match
 // header).
 DLLEXPORT unsigned long STDCALL FPDF_GetDocPermissions(FPDF_DOCUMENT document) {
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
-  if (!pDoc || !pDoc->GetParser())
+  // https://bugs.chromium.org/p/pdfium/issues/detail?id=499
+  if (!pDoc) {
 #ifndef PDF_ENABLE_XFA
     return 0;
 #else   // PDF_ENABLE_XFA
-    return (uint32_t)-1;
+    return 0xFFFFFFFF;
 #endif  // PDF_ENABLE_XFA
+  }
 
-  CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
-  return pDict ? pDict->GetIntegerBy("P") : (uint32_t)-1;
+  return pDoc->GetUserPermissions();
 }
 
 DLLEXPORT int STDCALL FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document) {
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   if (!pDoc || !pDoc->GetParser())
     return -1;
 
   CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
   return pDict ? pDict->GetIntegerBy("R") : -1;
 }
@@ skipping 657 matching lines @@
   if (!buffer) {
     *buflen = len;
   } else if (*buflen >= len) {
     memcpy(buffer, utf16Name.c_str(), len);
     *buflen = len;
   } else {
     *buflen = -1;
   }
   return (FPDF_DEST)pDestObj;
 }