Enable security removal in FPDF_Doc_Save

fpdfsdk/src/fpdfsave.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 "../include/fsdk_define.h"
 #include "../include/fpdfsave.h"
 #include "../include/fpdfedit.h"
 #if _FX_OS_ == _FX_ANDROID_
@@ skipping 42 matching lines @@
                 return FALSE;
 }
 
 FPDF_BOOL _FPDF_Doc_Save(FPDF_DOCUMENT document,FPDF_FILEWRITE * pFileWrite,FPDF_DWORD flags, FPDF_BOOL bSetVersion,
                                                  int fileVerion)
 {
         CPDF_Document* pDoc = (CPDF_Document*)document;
         if (!pDoc) 
                 return 0;
         
-        if ( flags < 1 || flags > 2 )
+        if ( flags < FPDF_INCREMENTAL || flags > FPDF_REMOVE_SECURITY )
         {
                 flags = 0;
         }
         
         CPDF_Creator FileMaker(pDoc);
         if(bSetVersion)
                 FileMaker.SetFileVersion(fileVerion);
+        if(flags == FPDF_REMOVE_SECURITY)
+        {
+                flags =  0;
+                FileMaker.RemoveSecurity();
+        }
         CFX_IFileWrite* pStreamWrite = NULL;
         FX_BOOL bRet;
         pStreamWrite = new CFX_IFileWrite;
         pStreamWrite->Init( pFileWrite );
         bRet = FileMaker.Create(pStreamWrite, flags);
         delete pStreamWrite;
         return bRet;
 }
 
 DLLEXPORT FPDF_BOOL STDCALL FPDF_SaveAsCopy(    FPDF_DOCUMENT document,FPDF_FILEWRITE * pFileWrite,
                                                                                                 FPDF_DWORD flags )
 {
         return _FPDF_Doc_Save(document, pFileWrite, flags, FALSE , 0);
 }
 
 
 DLLEXPORT FPDF_BOOL STDCALL FPDF_SaveWithVersion(       FPDF_DOCUMENT document,FPDF_FILEWRITE * pFileWrite,
         FPDF_DWORD flags, int fileVersion)
 {
         return _FPDF_Doc_Save(document, pFileWrite, flags, TRUE , fileVersion);
 }