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// SPDX-FileCopyrightText: Copyright 2017 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <array>
#include <vector>
#include "common/common_types.h"
namespace Network {
/// A class that serializes data for network transfer. It also handles endianness
class Packet {
public:
Packet() = default;
~Packet() = default;
/**
* Append data to the end of the packet
* @param data Pointer to the sequence of bytes to append
* @param size_in_bytes Number of bytes to append
*/
void Append(const void* data, std::size_t size_in_bytes);
/**
* Reads data from the current read position of the packet
* @param out_data Pointer where the data should get written to
* @param size_in_bytes Number of bytes to read
*/
void Read(void* out_data, std::size_t size_in_bytes);
/**
* Clear the packet
* After calling Clear, the packet is empty.
*/
void Clear();
/**
* Ignores bytes while reading
* @param length THe number of bytes to ignore
*/
void IgnoreBytes(u32 length);
/**
* Get a pointer to the data contained in the packet
* @return Pointer to the data
*/
const void* GetData() const;
/**
* This function returns the number of bytes pointed to by
* what getData returns.
* @return Data size, in bytes
*/
std::size_t GetDataSize() const;
/**
* This function is useful to know if there is some data
* left to be read, without actually reading it.
* @return True if all data was read, false otherwise
*/
bool EndOfPacket() const;
explicit operator bool() const;
/// Overloads of read function to read data from the packet
Packet& Read(bool& out_data);
Packet& Read(s8& out_data);
Packet& Read(u8& out_data);
Packet& Read(s16& out_data);
Packet& Read(u16& out_data);
Packet& Read(s32& out_data);
Packet& Read(u32& out_data);
Packet& Read(s64& out_data);
Packet& Read(u64& out_data);
Packet& Read(float& out_data);
Packet& Read(double& out_data);
Packet& Read(char* out_data);
Packet& Read(std::string& out_data);
template <typename T>
Packet& Read(std::vector<T>& out_data);
template <typename T, std::size_t S>
Packet& Read(std::array<T, S>& out_data);
/// Overloads of write function to write data into the packet
Packet& Write(bool in_data);
Packet& Write(s8 in_data);
Packet& Write(u8 in_data);
Packet& Write(s16 in_data);
Packet& Write(u16 in_data);
Packet& Write(s32 in_data);
Packet& Write(u32 in_data);
Packet& Write(s64 in_data);
Packet& Write(u64 in_data);
Packet& Write(float in_data);
Packet& Write(double in_data);
Packet& Write(const char* in_data);
Packet& Write(const std::string& in_data);
template <typename T>
Packet& Write(const std::vector<T>& in_data);
template <typename T, std::size_t S>
Packet& Write(const std::array<T, S>& data);
private:
/**
* Check if the packet can extract a given number of bytes
* This function updates accordingly the state of the packet.
* @param size Size to check
* @return True if size bytes can be read from the packet
*/
bool CheckSize(std::size_t size);
// Member data
std::vector<char> data; ///< Data stored in the packet
std::size_t read_pos = 0; ///< Current reading position in the packet
bool is_valid = true; ///< Reading state of the packet
};
template <typename T>
Packet& Packet::Read(std::vector<T>& out_data) {
// First extract the size
u32 size = 0;
Read(size);
out_data.resize(size);
// Then extract the data
for (std::size_t i = 0; i < out_data.size(); ++i) {
T character;
Read(character);
out_data[i] = character;
}
return *this;
}
template <typename T, std::size_t S>
Packet& Packet::Read(std::array<T, S>& out_data) {
for (std::size_t i = 0; i < out_data.size(); ++i) {
T character;
Read(character);
out_data[i] = character;
}
return *this;
}
template <typename T>
Packet& Packet::Write(const std::vector<T>& in_data) {
// First insert the size
Write(static_cast<u32>(in_data.size()));
// Then insert the data
for (std::size_t i = 0; i < in_data.size(); ++i) {
Write(in_data[i]);
}
return *this;
}
template <typename T, std::size_t S>
Packet& Packet::Write(const std::array<T, S>& in_data) {
for (std::size_t i = 0; i < in_data.size(); ++i) {
Write(in_data[i]);
}
return *this;
}
} // namespace Network
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