blob: 6aa4c3a4a85f94a494b4dfcea1dc979a355a178e [file] [log] [blame]
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <stdint.h>
#include <limits>
#include "base/logging.h"
#include "base/pickle.h"
#include "ipc/ipc_message.h"
#include "ipc/ipc_param_traits.h"
#include "mojo/public/cpp/bindings/bindings_export.h"
#include "mojo/public/cpp/bindings/lib/array_internal.h"
#include "mojo/public/cpp/bindings/lib/bindings_internal.h"
#include "mojo/public/cpp/bindings/lib/serialization_forward.h"
#include "mojo/public/cpp/bindings/lib/serialization_util.h"
#include "mojo/public/interfaces/bindings/native_struct.mojom.h"
namespace mojo {
namespace internal {
// Base class for the templated native struct serialization interface below,
// used to consolidated some shared logic and provide a basic
// Serialize/Deserialize for [Native] mojom structs which do not have a
// registered typemap in the current configuration (i.e. structs that are
// represented by a raw native::NativeStruct mojom struct in C++ bindings.)
struct MOJO_CPP_BINDINGS_EXPORT UnmappedNativeStructSerializerImpl {
static void Serialize(
const native::NativeStructPtr& input,
Buffer* buffer,
native::internal::NativeStruct_Data::BufferWriter* writer,
SerializationContext* context);
static bool Deserialize(native::internal::NativeStruct_Data* input,
native::NativeStructPtr* output,
SerializationContext* context);
static void SerializeMessageContents(
IPC::Message* message,
Buffer* buffer,
native::internal::NativeStruct_Data::BufferWriter* writer,
SerializationContext* context);
static bool DeserializeMessageAttachments(
native::internal::NativeStruct_Data* data,
SerializationContext* context,
IPC::Message* message);
template <typename MaybeConstUserType>
struct NativeStructSerializerImpl {
using UserType = typename std::remove_const<MaybeConstUserType>::type;
using Traits = IPC::ParamTraits<UserType>;
static void Serialize(
MaybeConstUserType& value,
Buffer* buffer,
native::internal::NativeStruct_Data::BufferWriter* writer,
SerializationContext* context) {
IPC::Message message;
Traits::Write(&message, value);
&message, buffer, writer, context);
static bool Deserialize(native::internal::NativeStruct_Data* data,
UserType* out,
SerializationContext* context) {
if (!data)
return false;
// Construct a temporary base::Pickle view over the array data. Note that
// the Array_Data is laid out like this:
// [num_bytes (4 bytes)] [num_elements (4 bytes)] [elements...]
// and base::Pickle expects to view data like this:
// [payload_size (4 bytes)] [header bytes ...] [payload...]
// Because ArrayHeader's num_bytes includes the length of the header and
// Pickle's payload_size does not, we need to adjust the stored value
// momentarily so Pickle can view the data.
ArrayHeader* header = reinterpret_cast<ArrayHeader*>(data->data.Get());
DCHECK_GE(header->num_bytes, sizeof(ArrayHeader));
header->num_bytes -= sizeof(ArrayHeader);
// Construct a view over the full Array_Data, including our hacked up
// header. Pickle will infer from this that the header is 8 bytes long,
// and the payload will contain all of the pickled bytes.
IPC::Message message_view(reinterpret_cast<const char*>(header),
header->num_bytes + sizeof(ArrayHeader));
base::PickleIterator iter(message_view);
if (!UnmappedNativeStructSerializerImpl::DeserializeMessageAttachments(
data, context, &message_view)) {
return false;
if (!Traits::Read(&message_view, &iter, out))
return false;
// Return the header to its original state.
header->num_bytes += sizeof(ArrayHeader);
return true;
template <>
struct NativeStructSerializerImpl<native::NativeStructPtr>
: public UnmappedNativeStructSerializerImpl {};
template <>
struct NativeStructSerializerImpl<const native::NativeStructPtr>
: public UnmappedNativeStructSerializerImpl {};
template <typename MaybeConstUserType>
struct Serializer<native::NativeStructDataView, MaybeConstUserType>
: public NativeStructSerializerImpl<MaybeConstUserType> {};
} // namespace internal
} // namespace mojo