From dcfe0a5febb252e3a4f40c1b25765740a269467f Mon Sep 17 00:00:00 2001
From: FearlessTobi <thm.frey@gmail.com>
Date: Wed, 6 Jul 2022 02:20:39 +0200
Subject: network: Add initial files and enet dependency

---
 src/network/packet.h | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 src/network/packet.h

(limited to 'src/network/packet.h')

diff --git a/src/network/packet.h b/src/network/packet.h
new file mode 100644
index 000000000..7bdc3da95
--- /dev/null
+++ b/src/network/packet.h
@@ -0,0 +1,166 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <vector>
+#include "common/common_types.h"
+
+namespace Network {
+
+/// A class that serializes data for network transfer. It also handles endianess
+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 operator >> to read data from the packet
+    Packet& operator>>(bool& out_data);
+    Packet& operator>>(s8& out_data);
+    Packet& operator>>(u8& out_data);
+    Packet& operator>>(s16& out_data);
+    Packet& operator>>(u16& out_data);
+    Packet& operator>>(s32& out_data);
+    Packet& operator>>(u32& out_data);
+    Packet& operator>>(s64& out_data);
+    Packet& operator>>(u64& out_data);
+    Packet& operator>>(float& out_data);
+    Packet& operator>>(double& out_data);
+    Packet& operator>>(char* out_data);
+    Packet& operator>>(std::string& out_data);
+    template <typename T>
+    Packet& operator>>(std::vector<T>& out_data);
+    template <typename T, std::size_t S>
+    Packet& operator>>(std::array<T, S>& out_data);
+
+    /// Overloads of operator << to write data into the packet
+    Packet& operator<<(bool in_data);
+    Packet& operator<<(s8 in_data);
+    Packet& operator<<(u8 in_data);
+    Packet& operator<<(s16 in_data);
+    Packet& operator<<(u16 in_data);
+    Packet& operator<<(s32 in_data);
+    Packet& operator<<(u32 in_data);
+    Packet& operator<<(s64 in_data);
+    Packet& operator<<(u64 in_data);
+    Packet& operator<<(float in_data);
+    Packet& operator<<(double in_data);
+    Packet& operator<<(const char* in_data);
+    Packet& operator<<(const std::string& in_data);
+    template <typename T>
+    Packet& operator<<(const std::vector<T>& in_data);
+    template <typename T, std::size_t S>
+    Packet& operator<<(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::operator>>(std::vector<T>& out_data) {
+    // First extract the size
+    u32 size = 0;
+    *this >> size;
+    out_data.resize(size);
+
+    // Then extract the data
+    for (std::size_t i = 0; i < out_data.size(); ++i) {
+        T character;
+        *this >> character;
+        out_data[i] = character;
+    }
+    return *this;
+}
+
+template <typename T, std::size_t S>
+Packet& Packet::operator>>(std::array<T, S>& out_data) {
+    for (std::size_t i = 0; i < out_data.size(); ++i) {
+        T character;
+        *this >> character;
+        out_data[i] = character;
+    }
+    return *this;
+}
+
+template <typename T>
+Packet& Packet::operator<<(const std::vector<T>& in_data) {
+    // First insert the size
+    *this << static_cast<u32>(in_data.size());
+
+    // Then insert the data
+    for (std::size_t i = 0; i < in_data.size(); ++i) {
+        *this << in_data[i];
+    }
+    return *this;
+}
+
+template <typename T, std::size_t S>
+Packet& Packet::operator<<(const std::array<T, S>& in_data) {
+    for (std::size_t i = 0; i < in_data.size(); ++i) {
+        *this << in_data[i];
+    }
+    return *this;
+}
+
+} // namespace Network
-- 
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