+ static constexpr std::size_t MAX_PAYLOAD_LEN = 500 - sizeof(Header);
+
+ std::uint8_t payload[MAX_PAYLOAD_LEN];
+
+
+ void Tag() noexcept { header.tag = TAG; }
+
+ void Type(std::uint8_t t) noexcept { header.type = t; }
+ std::uint8_t Type() const noexcept { return header.type; }
+ const char *TypeString() const noexcept { return Type2String(Type()); }
+
+
+ struct Payload {
+ std::size_t length;
+ std::uint8_t *data;
+
+ /// WARNING: do not use these if the data doesn not
+ /// point into a real packet's payload
+ const Packet &GetPacket() const noexcept {
+ return *reinterpret_cast<const Packet *>(data - sizeof(Header));
+ }
+ const Header &GetHeader() const noexcept {
+ return GetPacket().header;
+ }
+ std::uint16_t Seq() const noexcept {
+ return GetHeader().ctrl.seq;
+ }
+
+ template<class T>
+ void Write(const T &, size_t off) noexcept;
+ template<class T>
+ void Read(T &, size_t off) const noexcept;
+
+ void WriteString(const std::string &src, std::size_t off, std::size_t maxlen) noexcept;
+ void ReadString(std::string &dst, std::size_t off, std::size_t maxlen) const noexcept;
+ };
+
+ struct Ping : public Payload {
+ static constexpr std::uint8_t TYPE = 0;
+ static constexpr std::size_t MAX_LEN = 0;
+ };
+
+ struct Login : public Payload {
+ static constexpr std::uint8_t TYPE = 1;
+ static constexpr std::size_t MAX_LEN = 32;
+
+ void WritePlayerName(const std::string &) noexcept;
+ void ReadPlayerName(std::string &) const noexcept;
+ };
+
+ struct Join : public Payload {
+ static constexpr std::uint8_t TYPE = 2;
+ static constexpr std::size_t MAX_LEN = 100;
+
+ void WritePlayer(const Entity &) noexcept;
+ void ReadPlayerID(std::uint32_t &) const noexcept;
+ void ReadPlayerState(EntityState &) const noexcept;
+ void WriteWorldName(const std::string &) noexcept;
+ void ReadWorldName(std::string &) const noexcept;
+ };
+
+ struct Part : public Payload {
+ static constexpr std::uint8_t TYPE = 3;
+ static constexpr std::size_t MAX_LEN = 0;
+ };
+
+ struct PlayerUpdate : public Payload {
+ static constexpr std::uint8_t TYPE = 4;
+ static constexpr std::size_t MAX_LEN = 76;
+
+ void WritePredictedState(const EntityState &) noexcept;
+ void ReadPredictedState(EntityState &) const noexcept;
+ void WriteMovement(const glm::vec3 &) noexcept;
+ void ReadMovement(glm::vec3 &) const noexcept;
+ void WritePitch(float) noexcept;
+ void ReadPitch(float &) const noexcept;
+ void WriteYaw(float) noexcept;
+ void ReadYaw(float &) const noexcept;
+ void WriteActions(std::uint8_t) noexcept;
+ void ReadActions(std::uint8_t &) const noexcept;
+ void WriteSlot(std::uint8_t) noexcept;
+ void ReadSlot(std::uint8_t &) const noexcept;
+ };
+
+ struct SpawnEntity : public Payload {
+ static constexpr std::uint8_t TYPE = 5;
+ static constexpr std::size_t MAX_LEN = 132;
+
+ void WriteEntity(const Entity &) noexcept;
+ void ReadEntityID(std::uint32_t &) const noexcept;
+ void ReadSkeletonID(std::uint32_t &) const noexcept;
+ void ReadEntity(Entity &) const noexcept;
+ };
+
+ struct DespawnEntity : public Payload {
+ static constexpr std::uint8_t TYPE = 6;
+ static constexpr std::size_t MAX_LEN = 4;
+
+ void WriteEntityID(std::uint32_t) noexcept;
+ void ReadEntityID(std::uint32_t &) const noexcept;
+ };
+
+ struct EntityUpdate : public Payload {
+ static constexpr std::uint8_t TYPE = 7;
+ static constexpr std::size_t MAX_LEN = 480;
+
+ static constexpr std::uint32_t MAX_ENTITIES = 7;
+ static constexpr std::size_t GetSize(std::uint32_t num) noexcept {
+ return 4 + (num * 68);
+ }
+
+ void WriteEntityCount(std::uint32_t) noexcept;
+ void ReadEntityCount(std::uint32_t &) const noexcept;
+
+ void WriteEntity(const Entity &, std::uint32_t) noexcept;
+ void ReadEntityID(std::uint32_t &, std::uint32_t) const noexcept;
+ void ReadEntityState(EntityState &, std::uint32_t) const noexcept;
+ };
+
+ struct PlayerCorrection : public Payload {
+ static constexpr std::uint8_t TYPE = 8;
+ static constexpr std::size_t MAX_LEN = 66;
+
+ void WritePacketSeq(std::uint16_t) noexcept;
+ void ReadPacketSeq(std::uint16_t &) const noexcept;
+ void WritePlayer(const Entity &) noexcept;
+ void ReadPlayerState(EntityState &) const noexcept;
+ };
+
+ struct ChunkBegin : public Payload {
+ static constexpr std::uint8_t TYPE = 9;
+ static constexpr std::size_t MAX_LEN = 24;
+
+ void WriteTransmissionId(std::uint32_t) noexcept;
+ void ReadTransmissionId(std::uint32_t &) const noexcept;
+ void WriteFlags(std::uint32_t) noexcept;
+ void ReadFlags(std::uint32_t &) const noexcept;
+ void WriteChunkCoords(const glm::ivec3 &) noexcept;
+ void ReadChunkCoords(glm::ivec3 &) const noexcept;
+ void WriteDataSize(std::uint32_t) noexcept;
+ void ReadDataSize(std::uint32_t &) const noexcept;
+ };
+
+ struct ChunkData : public Payload {
+ static constexpr std::uint8_t TYPE = 10;
+ static constexpr std::size_t MAX_LEN = MAX_PAYLOAD_LEN;
+ static constexpr std::size_t MAX_DATA_LEN = MAX_LEN - 12;
+
+ void WriteTransmissionId(std::uint32_t) noexcept;
+ void ReadTransmissionId(std::uint32_t &) const noexcept;
+ void WriteDataOffset(std::uint32_t) noexcept;
+ void ReadDataOffset(std::uint32_t &) const noexcept;
+ void WriteDataSize(std::uint32_t) noexcept;
+ void ReadDataSize(std::uint32_t &) const noexcept;
+ void WriteData(const std::uint8_t *, std::size_t len) noexcept;
+ void ReadData(std::uint8_t *, std::size_t maxlen) const noexcept;
+ };
+
+ struct BlockUpdate : public Payload {
+ static constexpr std::uint8_t TYPE = 11;
+ static constexpr std::size_t MAX_LEN = 484;
+
+ static constexpr std::uint32_t MAX_BLOCKS = 78;
+ static constexpr std::size_t GetSize(std::uint32_t num) noexcept {
+ return 16 + (num * 6);
+ }
+
+ void WriteChunkCoords(const glm::ivec3 &) noexcept;
+ void ReadChunkCoords(glm::ivec3 &) const noexcept;
+ void WriteBlockCount(std::uint32_t) noexcept;
+ void ReadBlockCount(std::uint32_t &) const noexcept;
+
+ void WriteIndex(std::uint16_t, std::uint32_t) noexcept;
+ void ReadIndex(std::uint16_t &, std::uint32_t) const noexcept;
+ void WriteBlock(const Block &, std::uint32_t) noexcept;
+ void ReadBlock(Block &, std::uint32_t) const noexcept;
+ };
+
+
+ template<class PayloadType>
+ PayloadType As() {
+ PayloadType result;
+ result.length = PayloadType::MAX_LEN;
+ result.data = &payload[0];
+ return result;
+ }
+
+ template<class PayloadType>
+ static PayloadType As(const UDPpacket &pack) {
+ PayloadType result;
+ result.length = std::min(pack.len - sizeof(Header), PayloadType::MAX_LEN);
+ result.data = pack.data + sizeof(Header);
+ return result;
+ }