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// Copyright 2016 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.
#ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_NATIVE_ENUM_SERIALIZATION_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_NATIVE_ENUM_SERIALIZATION_H_
#include <stddef.h>
#include <stdint.h>
#include <type_traits>
#include "base/logging.h"
#include "base/pickle.h"
#include "ipc/ipc_param_traits.h"
#include "mojo/public/cpp/bindings/lib/serialization_forward.h"
#include "mojo/public/cpp/bindings/native_enum.h"
namespace mojo {
namespace internal {
template <typename MaybeConstUserType>
struct NativeEnumSerializerImpl {
using UserType = typename std::remove_const<MaybeConstUserType>::type;
using Traits = IPC::ParamTraits<UserType>;
// IPC_ENUM_TRAITS* macros serialize enum as int, make sure that fits into
// mojo native-only enum.
static_assert(sizeof(NativeEnum) >= sizeof(int),
"Cannot store the serialization result in NativeEnum.");
static void Serialize(UserType input, int32_t* output) {
base::Pickle pickle;
Traits::Write(&pickle, input);
CHECK_GE(sizeof(int32_t), pickle.payload_size());
*output = 0;
memcpy(reinterpret_cast<char*>(output), pickle.payload(),
pickle.payload_size());
}
struct PickleData {
uint32_t payload_size;
int32_t value;
};
static_assert(sizeof(PickleData) == 8, "PickleData size mismatch.");
static bool Deserialize(int32_t input, UserType* output) {
PickleData data = {sizeof(int32_t), input};
base::Pickle pickle_view(reinterpret_cast<const char*>(&data),
sizeof(PickleData));
base::PickleIterator iter(pickle_view);
return Traits::Read(&pickle_view, &iter, output);
}
};
struct UnmappedNativeEnumSerializerImpl {
static void Serialize(NativeEnum input, int32_t* output) {
*output = static_cast<int32_t>(input);
}
static bool Deserialize(int32_t input, NativeEnum* output) {
*output = static_cast<NativeEnum>(input);
return true;
}
};
template <>
struct NativeEnumSerializerImpl<NativeEnum>
: public UnmappedNativeEnumSerializerImpl {};
template <>
struct NativeEnumSerializerImpl<const NativeEnum>
: public UnmappedNativeEnumSerializerImpl {};
template <typename MaybeConstUserType>
struct Serializer<NativeEnum, MaybeConstUserType>
: public NativeEnumSerializerImpl<MaybeConstUserType> {};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_NATIVE_ENUM_SERIALIZATION_H_
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