import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

xpcom/io/nsDirectoryServiceUtils.h

@@ -0,0 +1,31 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsDirectoryServiceUtils_h___
+#define nsDirectoryServiceUtils_h___
+
+#include "nsIServiceManager.h"
+#include "nsIProperties.h"
+#include "nsServiceManagerUtils.h"
+#include "nsCOMPtr.h"
+#include "nsXPCOMCID.h"
+#include "nsIFile.h"
+
+inline nsresult
+NS_GetSpecialDirectory(const char* aSpecialDirName, nsIFile** aResult)
+{
+  nsresult rv;
+  nsCOMPtr<nsIProperties> serv(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID,
+                                             &rv));
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return serv->Get(aSpecialDirName, NS_GET_IID(nsIFile),
+                   reinterpret_cast<void**>(aResult));
+}
+
+#endif