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/* -*- 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 __IPC_GLUE_SERIALIZEDSTRUCTUREDCLONEBUFFER_H__
#define __IPC_GLUE_SERIALIZEDSTRUCTUREDCLONEBUFFER_H__
#include <algorithm>
#include <cstdint>
#include <cstdlib>
#include <string>
#include <utility>
#include "chrome/common/ipc_message.h"
#include "chrome/common/ipc_message_utils.h"
#include "js/AllocPolicy.h"
#include "js/StructuredClone.h"
#include "mozilla/Assertions.h"
#include "mozilla/BufferList.h"
#include "mozilla/Vector.h"
#include "mozilla/mozalloc.h"
class PickleIterator;
namespace mozilla {
template <typename...>
class Variant;
namespace detail {
template <typename...>
struct VariantTag;
}
} // namespace mozilla
namespace mozilla {
struct SerializedStructuredCloneBuffer final {
SerializedStructuredCloneBuffer() = default;
SerializedStructuredCloneBuffer(SerializedStructuredCloneBuffer&&) = default;
SerializedStructuredCloneBuffer& operator=(
SerializedStructuredCloneBuffer&&) = default;
SerializedStructuredCloneBuffer(const SerializedStructuredCloneBuffer&) =
delete;
SerializedStructuredCloneBuffer& operator=(
const SerializedStructuredCloneBuffer& aOther) = delete;
bool operator==(const SerializedStructuredCloneBuffer& aOther) const {
// The copy assignment operator and the equality operator are
// needed by the IPDL generated code. We relied on the copy
// assignment operator at some places but we never use the
// equality operator.
return false;
}
JSStructuredCloneData data{JS::StructuredCloneScope::Unassigned};
};
} // namespace mozilla
namespace IPC {
template <>
struct ParamTraits<JSStructuredCloneData> {
typedef JSStructuredCloneData paramType;
static void Write(Message* aMsg, const paramType& aParam) {
MOZ_ASSERT(!(aParam.Size() % sizeof(uint64_t)));
WriteParam(aMsg, aParam.Size());
aParam.ForEachDataChunk([&](const char* aData, size_t aSize) {
return aMsg->WriteBytes(aData, aSize, sizeof(uint64_t));
});
}
static bool Read(const Message* aMsg, PickleIterator* aIter,
paramType* aResult) {
size_t length = 0;
if (!ReadParam(aMsg, aIter, &length)) {
return false;
}
MOZ_ASSERT(!(length % sizeof(uint64_t)));
mozilla::BufferList<InfallibleAllocPolicy> buffers(0, 0, 4096);
// Borrowing is not suitable to use for IPC to hand out data
// because we often want to store the data somewhere for
// processing after IPC has released the underlying buffers. One
// case is PContentChild::SendGetXPCOMProcessAttributes. We can't
// return a borrowed buffer because the out param outlives the
// IPDL callback.
if (length &&
!aMsg->ExtractBuffers(aIter, length, &buffers, sizeof(uint64_t))) {
return false;
}
bool success;
mozilla::BufferList<js::SystemAllocPolicy> out =
buffers.MoveFallible<js::SystemAllocPolicy>(&success);
if (!success) {
return false;
}
*aResult = JSStructuredCloneData(
std::move(out), JS::StructuredCloneScope::DifferentProcess);
return true;
}
};
template <>
struct ParamTraits<mozilla::SerializedStructuredCloneBuffer> {
typedef mozilla::SerializedStructuredCloneBuffer paramType;
static void Write(Message* aMsg, const paramType& aParam) {
WriteParam(aMsg, aParam.data);
}
static bool Read(const Message* aMsg, PickleIterator* aIter,
paramType* aResult) {
return ReadParam(aMsg, aIter, &aResult->data);
}
static void Log(const paramType& aParam, std::wstring* aLog) {
LogParam(aParam.data.Size(), aLog);
}
};
} // namespace IPC
#endif /* __IPC_GLUE_SERIALIZEDSTRUCTUREDCLONEBUFFER_H__ */