1 files changed, 46 insertions, 0 deletions
diff --git a/dom/ipc/DocShellMessageUtils.cpp b/dom/ipc/DocShellMessageUtils.cpp
new file mode 100644
index 0000000000..011abe3246
--- /dev/null
+++ b/dom/ipc/DocShellMessageUtils.cpp
@@ -0,0 +1,46 @@
+/* -*- 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/. */
+
+#include "mozilla/dom/DocShellMessageUtils.h"
+#include "mozilla/dom/DOMTypes.h"
+#include "mozilla/ipc/IPDLParamTraits.h"
+#include "nsSerializationHelper.h"
+
+namespace IPC {
+
+void ParamTraits<nsDocShellLoadState*>::Write(IPC::MessageWriter* aWriter,
+                                              nsDocShellLoadState* aParam) {
+  MOZ_RELEASE_ASSERT(aParam);
+  WriteParam(aWriter, aParam->Serialize(aWriter->GetActor()));
+}
+
+bool ParamTraits<nsDocShellLoadState*>::Read(
+    IPC::MessageReader* aReader, RefPtr<nsDocShellLoadState>* aResult) {
+  mozilla::dom::DocShellLoadStateInit loadState;
+  if (!ReadParam(aReader, &loadState)) {
+    return false;
+  }
+
+  // Assert if we somehow don't have a URI in our IPDL type, because we can't
+  // construct anything out of it. This mimics the assertion in the constructor
+  // for nsDocShellLoadState, but makes it clearer that the
+  // DocShellLoadStateInit IPC object can't be clearly converted into a
+  // nsDocShellLoadState.
+  if (!loadState.URI()) {
+    MOZ_ASSERT_UNREACHABLE("no URI in load state from IPC");
+    return false;
+  }
+
+  bool readSuccess = false;
+  RefPtr result =
+      new nsDocShellLoadState(loadState, aReader->GetActor(), &readSuccess);
+  if (readSuccess) {
+    *aResult = result.forget();
+  }
+  return readSuccess;
+}
+
+}  // namespace IPC