1 files changed, 38 insertions, 0 deletions
diff --git a/dom/ipc/PermissionMessageUtils.h b/dom/ipc/PermissionMessageUtils.h
new file mode 100644
index 0000000000..7a32b9e930
--- /dev/null
+++ b/dom/ipc/PermissionMessageUtils.h
@@ -0,0 +1,38 @@
+/* -*- 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 "mozilla/ipc/IPDLParamTraits.h"
+#include "ipc/IPCMessageUtils.h"
+#include "nsCOMPtr.h"
+#include "nsIPrincipal.h"
+
+namespace mozilla::ipc {
+
+template <>
+struct IPDLParamTraits<nsIPrincipal*> {
+  static void Write(IPC::MessageWriter* aWriter, IProtocol* aActor,
+                    nsIPrincipal* aParam);
+  static bool Read(IPC::MessageReader* aReader, IProtocol* aActor,
+                   RefPtr<nsIPrincipal>* aResult);
+
+  // Overload to support deserializing nsCOMPtr<nsIPrincipal> directly.
+  static bool Read(IPC::MessageReader* aReader, IProtocol* aActor,
+                   nsCOMPtr<nsIPrincipal>* aResult) {
+    RefPtr<nsIPrincipal> result;
+    if (!Read(aReader, aActor, &result)) {
+      return false;
+    }
+    *aResult = std::move(result);
+    return true;
+  }
+};
+
+}  // namespace mozilla::ipc
+
+#endif  // mozilla_dom_permission_message_utils_h__