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// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
#include <memory>
#include <span>
#include <vector>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/common_types.h"
namespace Service::android {
struct ParcelHeader {
u32 data_size;
u32 data_offset;
u32 objects_size;
u32 objects_offset;
};
static_assert(sizeof(ParcelHeader) == 16, "ParcelHeader has wrong size");
class InputParcel final {
public:
explicit InputParcel(std::span<const u8> in_data) : read_buffer(std::move(in_data)) {
DeserializeHeader();
[[maybe_unused]] const std::u16string token = ReadInterfaceToken();
}
template <typename T>
void Read(T& val) {
static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
ASSERT(read_index + sizeof(T) <= read_buffer.size());
std::memcpy(&val, read_buffer.data() + read_index, sizeof(T));
read_index += sizeof(T);
read_index = Common::AlignUp(read_index, 4);
}
template <typename T>
T Read() {
T val;
Read(val);
return val;
}
template <typename T>
void ReadFlattened(T& val) {
const auto flattened_size = Read<s64>();
ASSERT(sizeof(T) == flattened_size);
Read(val);
}
template <typename T>
T ReadFlattened() {
T val;
ReadFlattened(val);
return val;
}
template <typename T>
T ReadUnaligned() {
static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
ASSERT(read_index + sizeof(T) <= read_buffer.size());
T val;
std::memcpy(&val, read_buffer.data() + read_index, sizeof(T));
read_index += sizeof(T);
return val;
}
template <typename T>
const std::shared_ptr<T> ReadObject() {
static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
const auto is_valid{Read<bool>()};
if (is_valid) {
auto result = std::make_shared<T>();
ReadFlattened(*result);
return result;
}
return {};
}
std::u16string ReadInterfaceToken() {
[[maybe_unused]] const u32 unknown = Read<u32>();
const u32 length = Read<u32>();
std::u16string token;
token.reserve(length + 1);
for (u32 ch = 0; ch < length + 1; ++ch) {
token.push_back(ReadUnaligned<u16>());
}
read_index = Common::AlignUp(read_index, 4);
return token;
}
void DeserializeHeader() {
ASSERT(read_buffer.size() > sizeof(ParcelHeader));
ParcelHeader header{};
std::memcpy(&header, read_buffer.data(), sizeof(ParcelHeader));
read_index = header.data_offset;
}
private:
std::span<const u8> read_buffer;
std::size_t read_index = 0;
};
class OutputParcel final {
public:
OutputParcel() = default;
template <typename T>
void Write(const T& val) {
this->WriteImpl(val, m_data_buffer);
}
template <typename T>
void WriteFlattenedObject(const T* ptr) {
if (!ptr) {
this->Write<u32>(0);
return;
}
this->Write<u32>(1);
this->Write<s64>(sizeof(T));
this->Write(*ptr);
}
template <typename T>
void WriteFlattenedObject(const std::shared_ptr<T> ptr) {
this->WriteFlattenedObject(ptr.get());
}
template <typename T>
void WriteInterface(const T& val) {
this->WriteImpl(val, m_data_buffer);
this->WriteImpl(0U, m_object_buffer);
}
std::vector<u8> Serialize() const {
std::vector<u8> output_buffer(sizeof(ParcelHeader) + m_data_buffer.size() +
m_object_buffer.size());
ParcelHeader header{};
header.data_size = static_cast<u32>(m_data_buffer.size());
header.data_offset = sizeof(ParcelHeader);
header.objects_size = static_cast<u32>(m_object_buffer.size());
header.objects_offset = header.data_offset + header.data_size;
std::memcpy(output_buffer.data(), &header, sizeof(header));
std::ranges::copy(m_data_buffer, output_buffer.data() + header.data_offset);
std::ranges::copy(m_object_buffer, output_buffer.data() + header.objects_offset);
return output_buffer;
}
private:
template <typename T>
requires(std::is_trivially_copyable_v<T>)
void WriteImpl(const T& val, std::vector<u8>& buffer) {
const size_t aligned_size = Common::AlignUp(sizeof(T), 4);
const size_t old_size = buffer.size();
buffer.resize(old_size + aligned_size);
std::memcpy(buffer.data() + old_size, &val, sizeof(T));
}
private:
std::vector<u8> m_data_buffer;
std::vector<u8> m_object_buffer;
};
} // namespace Service::android
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