/* -*- 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 "ipc/IPCMessageUtils.h"

#include "mozilla/ErrorResult.h"

#include "mozilla/Assertions.h"

#include "mozilla/Move.h"

#ifndef IPC_ErrorIPCUtils_h

#define IPC_ErrorIPCUtils_h

namespace IPC {

template <>

struct ParamTraits<mozilla::dom::ErrNum>

    : public ContiguousEnumSerializer<

          mozilla::dom::ErrNum, mozilla::dom::ErrNum(0),

          mozilla::dom::ErrNum(mozilla::dom::Err_Limit)> {};

template <>

struct ParamTraits<mozilla::ErrorResult> {

  typedef mozilla::ErrorResult paramType;

  static void Write(Message* aMsg, const paramType& aParam) {

    // It should be the case that mMightHaveUnreportedJSException can only be

    // true when we're expecting a JS exception.  We cannot send such messages

    // over the IPC channel since there is no sane way of transferring the JS

    // value over to the other side.  Callers should never do that.

    MOZ_ASSERT_IF(aParam.IsJSException(),

                  aParam.mMightHaveUnreportedJSException);

    if (aParam.IsJSException()

#ifdef DEBUG

        || aParam.mMightHaveUnreportedJSException

#endif

    ) {

      MOZ_CRASH(

          "Cannot encode an ErrorResult representing a Javascript exception");

    }

    WriteParam(aMsg, aParam.mResult);

    WriteParam(aMsg, aParam.IsErrorWithMessage());

    WriteParam(aMsg, aParam.IsDOMException());

    if (aParam.IsErrorWithMessage()) {

      aParam.SerializeMessage(aMsg);

    } else if (aParam.IsDOMException()) {

      aParam.SerializeDOMExceptionInfo(aMsg);

    }

  }

  static bool Read(const Message* aMsg, PickleIterator* aIter,

                   paramType* aResult) {

    paramType readValue;

    if (!ReadParam(aMsg, aIter, &readValue.mResult)) {

      return false;

    }

    bool hasMessage = false;

    if (!ReadParam(aMsg, aIter, &hasMessage)) {

      return false;

    }

    bool hasDOMExceptionInfo = false;

    if (!ReadParam(aMsg, aIter, &hasDOMExceptionInfo)) {

      return false;

    }

    if (hasMessage && hasDOMExceptionInfo) {

      // Shouldn't have both!

      return false;

    }

    if (hasMessage && !readValue.DeserializeMessage(aMsg, aIter)) {

      return false;

    } else if (hasDOMExceptionInfo &&

               !readValue.DeserializeDOMExceptionInfo(aMsg, aIter)) {

      return false;

    }

    *aResult = Move(readValue);

    return true;

  }

};

}  // namespace IPC

#endif