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// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright 2021 yuzu Emulator Project
#pragma once
#include <memory>
#include <vector>
#include "common/alignment.h"
#include "common/assert.h"
#include "common/common_types.h"
namespace android {
class Parcel final {
public:
static constexpr std::size_t DefaultBufferSize = 0x40;
Parcel() : buffer(DefaultBufferSize) {}
template <typename T>
explicit Parcel(const T& out_data) : buffer(DefaultBufferSize) {
Write(out_data);
}
explicit Parcel(std::vector<u8> in_data) : 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) <= buffer.size());
std::memcpy(&val, 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) <= buffer.size());
T val;
std::memcpy(&val, 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{};
for (u32 ch = 0; ch < length + 1; ++ch) {
token.push_back(ReadUnaligned<u16>());
}
read_index = Common::AlignUp(read_index, 4);
return token;
}
template <typename T>
void Write(const T& val) {
static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
if (buffer.size() < write_index + sizeof(T)) {
buffer.resize(buffer.size() + sizeof(T) + DefaultBufferSize);
}
std::memcpy(buffer.data() + write_index, &val, sizeof(T));
write_index += sizeof(T);
write_index = Common::AlignUp(write_index, 4);
}
template <typename T>
void WriteObject(const T* ptr) {
static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
if (!ptr) {
Write<u32>(0);
return;
}
Write<u32>(1);
Write<s64>(sizeof(T));
Write(*ptr);
}
template <typename T>
void WriteObject(const std::shared_ptr<T> ptr) {
WriteObject(ptr.get());
}
void DeserializeHeader() {
ASSERT(buffer.size() > sizeof(Header));
Header header{};
std::memcpy(&header, buffer.data(), sizeof(Header));
read_index = header.data_offset;
}
std::vector<u8> Serialize() const {
ASSERT(read_index == 0);
Header header{};
header.data_size = static_cast<u32>(write_index - sizeof(Header));
header.data_offset = sizeof(Header);
header.objects_size = 4;
header.objects_offset = static_cast<u32>(sizeof(Header) + header.data_size);
std::memcpy(buffer.data(), &header, sizeof(Header));
return buffer;
}
private:
struct Header {
u32 data_size;
u32 data_offset;
u32 objects_size;
u32 objects_offset;
};
static_assert(sizeof(Header) == 16, "ParcelHeader has wrong size");
mutable std::vector<u8> buffer;
std::size_t read_index = 0;
std::size_t write_index = sizeof(Header);
};
} // namespace android
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