dom/ipc/DocShellMessageUtils.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/DocShellMessageUtils.h"
   8 #include "mozilla/dom/DOMTypes.h"
   9 #include "mozilla/ipc/IPDLParamTraits.h"
  10 #include "nsSerializationHelper.h"
  11
  12 namespace IPC {
  13
  14 void ParamTraits<nsDocShellLoadState*>::Write(IPC::MessageWriter* aWriter,
  15                                               nsDocShellLoadState* aParam) {
  16   MOZ_RELEASE_ASSERT(aParam);
  17   WriteParam(aWriter, aParam->Serialize(aWriter->GetActor()));
  18 }
  19
  20 bool ParamTraits<nsDocShellLoadState*>::Read(
  21     IPC::MessageReader* aReader, RefPtr<nsDocShellLoadState>* aResult) {
  22   mozilla::dom::DocShellLoadStateInit loadState;
  23   if (!ReadParam(aReader, &loadState)) {
  24     return false;
  25   }
  26
  27   // Assert if we somehow don't have a URI in our IPDL type, because we can't
  28   // construct anything out of it. This mimics the assertion in the constructor
  29   // for nsDocShellLoadState, but makes it clearer that the
  30   // DocShellLoadStateInit IPC object can't be clearly converted into a
  31   // nsDocShellLoadState.
  32   if (!loadState.URI()) {
  33     MOZ_ASSERT_UNREACHABLE("no URI in load state from IPC");
  34     return false;
  35   }
  36
  37   bool readSuccess = false;
  38   RefPtr result =
  39       new nsDocShellLoadState(loadState, aReader->GetActor(), &readSuccess);
  40   if (readSuccess) {
  41     *aResult = result.forget();
  42   }
  43   return readSuccess;
  44 }
  45
  46 }  // namespace IPC