1 files changed, 52 insertions, 0 deletions
diff --git a/dom/ipc/PermissionMessageUtils.h b/dom/ipc/PermissionMessageUtils.h
new file mode 100644
index 000000000..3434c83b9
--- /dev/null
+++ b/dom/ipc/PermissionMessageUtils.h
@@ -0,0 +1,52 @@
+/* -*- 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 mozilla_dom_permission_message_utils_h__
+#define mozilla_dom_permission_message_utils_h__
+
+#include "ipc/IPCMessageUtils.h"
+#include "nsCOMPtr.h"
+#include "nsIPrincipal.h"
+
+namespace IPC {
+
+class Principal
+{
+  friend struct ParamTraits<Principal>;
+
+public:
+  Principal()
+    : mPrincipal(nullptr)
+  {}
+
+  explicit Principal(nsIPrincipal* aPrincipal)
+    : mPrincipal(aPrincipal)
+  {}
+
+  operator nsIPrincipal*() const { return mPrincipal.get(); }
+
+  Principal& operator=(const Principal& aOther)
+  {
+    mPrincipal = aOther.mPrincipal;
+    return *this;
+  }
+
+private:
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+};
+
+template <>
+struct ParamTraits<Principal>
+{
+  typedef Principal paramType;
+  static void Write(Message* aMsg, const paramType& aParam);
+  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult);
+};
+
+} // namespace IPC
+
+#endif // mozilla_dom_permission_message_utils_h__
+