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authorliamwhite <liamwhite@users.noreply.github.com>2022-07-26 00:31:45 +0200
committerGitHub <noreply@github.com>2022-07-26 00:31:45 +0200
commit1e67d2b59f6dfd561768db3fb9a8e0c6a16ec9f2 (patch)
tree999411f1ca76390654d1034c6d0bd2c47c3f101c /src/network/packet.h
parentMerge pull request #8564 from lat9nq/dinner-fork (diff)
parentnetwork: Address review comments (diff)
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1 files changed, 165 insertions, 0 deletions
diff --git a/src/network/packet.h b/src/network/packet.h
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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 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 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