src/net/net.cpp

   1 #include "Connection.hpp"
   2 #include "ConnectionHandler.hpp"
   3 #include "io.hpp"
   4 #include "Packet.hpp"
   5
   6 #include "../app/init.hpp"
   7 #include "../model/Model.hpp"
   8 #include "../world/Entity.hpp"
   9 #include "../world/EntityState.hpp"
  10
  11 #include <cstring>
  12
  13 using namespace std;
  14
  15
  16 namespace blank {
  17
  18 constexpr size_t Packet::Ping::MAX_LEN;
  19 constexpr size_t Packet::Login::MAX_LEN;
  20 constexpr size_t Packet::Join::MAX_LEN;
  21 constexpr size_t Packet::Part::MAX_LEN;
  22 constexpr size_t Packet::PlayerUpdate::MAX_LEN;
  23 constexpr size_t Packet::SpawnEntity::MAX_LEN;
  24 constexpr size_t Packet::DespawnEntity::MAX_LEN;
  25 constexpr size_t Packet::EntityUpdate::MAX_LEN;
  26 constexpr size_t Packet::PlayerCorrection::MAX_LEN;
  27 constexpr size_t Packet::ChunkBegin::MAX_LEN;
  28 constexpr size_t Packet::ChunkData::MAX_LEN;
  29 constexpr size_t Packet::BlockUpdate::MAX_LEN;
  30 constexpr size_t Packet::Message::MAX_LEN;
  31 constexpr size_t Packet::Message::MAX_MESSAGE_LEN;
  32
  33 Connection::Connection(const IPaddress &addr)
  34 : handler(nullptr)
  35 , addr(addr)
  36 , send_timer(500)
  37 , recv_timer(10000)
  38 , ctrl_out{ 0, 0xFFFF, 0xFFFFFFFF }
  39 , ctrl_in{ 0, 0xFFFF, 0xFFFFFFFF }
  40 , closed(false) {
  41         send_timer.Start();
  42         recv_timer.Start();
  43 }
  44
  45 bool Connection::Matches(const IPaddress &remote) const noexcept {
  46         return memcmp(&addr, &remote, sizeof(IPaddress)) == 0;
  47 }
  48
  49 void Connection::FlagSend() noexcept {
  50         send_timer.Reset();
  51 }
  52
  53 void Connection::FlagRecv() noexcept {
  54         recv_timer.Reset();
  55 }
  56
  57 bool Connection::ShouldPing() const noexcept {
  58         return !closed && send_timer.HitOnce();
  59 }
  60
  61 bool Connection::TimedOut() const noexcept {
  62         return recv_timer.HitOnce();
  63 }
  64
  65 void Connection::Update(int dt) {
  66         send_timer.Update(dt);
  67         recv_timer.Update(dt);
  68         if (TimedOut()) {
  69                 Close();
  70                 if (HasHandler()) {
  71                         Handler().OnTimeout();
  72                 }
  73         }
  74 }
  75
  76
  77 uint16_t Connection::Send(UDPpacket &udp_pack, UDPsocket sock) {
  78         Packet &pack = *reinterpret_cast<Packet *>(udp_pack.data);
  79         pack.header.ctrl = ctrl_out;
  80         uint16_t seq = ctrl_out.seq++;
  81
  82         udp_pack.address = addr;
  83         if (SDLNet_UDP_Send(sock, -1, &udp_pack) == 0) {
  84                 throw NetError("SDLNet_UDP_Send");
  85         }
  86
  87         FlagSend();
  88         return seq;
  89 }
  90
  91 void Connection::Received(const UDPpacket &udp_pack) {
  92         Packet &pack = *reinterpret_cast<Packet *>(udp_pack.data);
  93
  94         // ack to the remote
  95         int16_t diff = int16_t(pack.header.ctrl.seq) - int16_t(ctrl_out.ack);
  96         if (diff > 0) {
  97                 if (diff >= 32) {
  98                         ctrl_out.hist = 0;
  99                 } else {
 100                         ctrl_out.hist <<= diff;
 101                         ctrl_out.hist |= 1 << (diff - 1);
 102                 }
 103         } else if (diff < 0 && diff >= -32) {
 104                 ctrl_out.hist |= 1 << (-diff - 1);
 105         }
 106         ctrl_out.ack = pack.header.ctrl.seq;
 107         FlagRecv();
 108
 109         if (!HasHandler()) {
 110                 return;
 111         }
 112
 113         Packet::TControl ctrl_new = pack.header.ctrl;
 114         Handler().Handle(udp_pack);
 115
 116         if (diff > 0) {
 117                 // if the packet holds more recent information
 118                 // check if remote failed to ack one of our packets
 119                 diff = int16_t(ctrl_new.ack) - int16_t(ctrl_in.ack);
 120                 // should always be true, but you never know…
 121                 if (diff > 0) {
 122                         for (int i = 0; i < diff; ++i) {
 123                                 if (i > 32 || (i < 32 && (ctrl_in.hist & (1 << (31 - i))) == 0)) {
 124                                         Handler().PacketLost(ctrl_in.ack - 32 + i);
 125                                 }
 126                         }
 127                 }
 128                 // check for newly ack'd packets
 129                 for (uint16_t s = ctrl_new.AckBegin(); s != ctrl_new.AckEnd(); --s) {
 130                         if (ctrl_new.Acks(s) && !ctrl_in.Acks(s)) {
 131                                 Handler().PacketReceived(s);
 132                         }
 133                 }
 134                 ctrl_in = ctrl_new;
 135         }
 136 }
 137
 138 bool Packet::TControl::Acks(uint16_t s) const noexcept {
 139         int16_t diff = int16_t(ack) - int16_t(s);
 140         if (diff == 0) return true;
 141         if (diff < 0 || diff > 32) return false;
 142         return (hist & (1 << (diff - 1))) != 0;
 143 }
 144
 145 uint16_t Connection::SendPing(UDPpacket &udp_pack, UDPsocket sock) {
 146         Packet::Make<Packet::Ping>(udp_pack);
 147         return Send(udp_pack, sock);
 148 }
 149
 150
 151 ConnectionHandler::ConnectionHandler()
 152 : packets_lost(0)
 153 , packets_received(0)
 154 , packet_loss(0.0f) {
 155
 156 }
 157
 158 void ConnectionHandler::PacketLost(uint16_t seq) {
 159         OnPacketLost(seq);
 160         ++packets_lost;
 161         UpdatePacketLoss();
 162 }
 163
 164 void ConnectionHandler::PacketReceived(uint16_t seq) {
 165         OnPacketReceived(seq);
 166         ++packets_received;
 167         UpdatePacketLoss();
 168 }
 169
 170 void ConnectionHandler::UpdatePacketLoss() noexcept {
 171         unsigned int packets_total = packets_lost + packets_received;
 172         if (packets_total >= 256) {
 173                 packet_loss = float(packets_lost) / float(packets_total);
 174                 packets_lost = 0;
 175                 packets_received = 0;
 176         }
 177 }
 178
 179
 180 ostream &operator <<(ostream &out, const IPaddress &addr) {
 181         const unsigned char *host = reinterpret_cast<const unsigned char *>(&addr.host);
 182         out << int(host[0])
 183                 << '.' << int(host[1])
 184                 << '.' << int(host[2])
 185                 << '.' << int(host[3]);
 186         if (addr.port) {
 187                 out << ':' << SDLNet_Read16(&addr.port);
 188         }
 189         return out;
 190 }
 191
 192
 193 const char *Packet::Type2String(uint8_t t) noexcept {
 194         switch (t) {
 195                 case Ping::TYPE:
 196                         return "Ping";
 197                 case Login::TYPE:
 198                         return "Login";
 199                 case Join::TYPE:
 200                         return "Join";
 201                 case Part::TYPE:
 202                         return "Part";
 203                 case PlayerUpdate::TYPE:
 204                         return "PlayerUpdate";
 205                 case SpawnEntity::TYPE:
 206                         return "SpawnEntity";
 207                 case DespawnEntity::TYPE:
 208                         return "DespawnEntity";
 209                 case EntityUpdate::TYPE:
 210                         return "EntityUpdate";
 211                 case PlayerCorrection::TYPE:
 212                         return "PlayerCorrection";
 213                 case ChunkBegin::TYPE:
 214                         return "ChunkBegin";
 215                 case ChunkData::TYPE:
 216                         return "ChunkData";
 217                 case BlockUpdate::TYPE:
 218                         return "BlockUpdate";
 219                 case Message::TYPE:
 220                         return "Message";
 221                 default:
 222                         return "Unknown";
 223         }
 224 }
 225
 226 template<class T>
 227 void Packet::Payload::Write(const T &src, size_t off) noexcept {
 228         if ((length - off) < sizeof(T)) {
 229                 // dismiss out of bounds write
 230                 return;
 231         }
 232         *reinterpret_cast<T *>(&data[off]) = src;
 233 }
 234
 235 template<class T>
 236 void Packet::Payload::Read(T &dst, size_t off) const noexcept {
 237         if ((length - off) < sizeof(T)) {
 238                 // dismiss out of bounds read
 239                 return;
 240         }
 241         dst = *reinterpret_cast<T *>(&data[off]);
 242 }
 243
 244 void Packet::Payload::WriteString(const string &src, size_t off, size_t maxlen) noexcept {
 245         uint8_t *dst = &data[off];
 246         size_t len = min(maxlen, length - off);
 247         if (src.size() < len) {
 248                 memset(dst, '\0', len);
 249                 memcpy(dst, src.c_str(), src.size());
 250         } else {
 251                 memcpy(dst, src.c_str(), len);
 252         }
 253 }
 254
 255 void Packet::Payload::ReadString(string &dst, size_t off, size_t maxlen) const noexcept {
 256         size_t len = min(maxlen, length - off);
 257         dst.clear();
 258         dst.reserve(len);
 259         for (size_t i = 0; i < len && data[off + i] != '\0'; ++i) {
 260                 dst.push_back(data[off + i]);
 261         }
 262 }
 263
 264 void Packet::Payload::Write(const glm::quat &val, size_t off) noexcept {
 265         WritePackN(val.w, off);
 266         WritePackN(val.x, off + 2);
 267         WritePackN(val.y, off + 4);
 268         WritePackN(val.z, off + 6);
 269 }
 270
 271 void Packet::Payload::Read(glm::quat &val, size_t off) const noexcept {
 272         ReadPackN(val.w, off);
 273         ReadPackN(val.x, off + 2);
 274         ReadPackN(val.y, off + 4);
 275         ReadPackN(val.z, off + 6);
 276         val = normalize(val);
 277 }
 278
 279 void Packet::Payload::Write(const EntityState &state, size_t off) noexcept {
 280         Write(state.chunk_pos, off);
 281         WritePackU(state.block_pos * (1.0f / 16.0f), off + 12);
 282         Write(state.velocity, off + 18);
 283         Write(state.orient, off + 30);
 284 }
 285
 286 void Packet::Payload::Read(EntityState &state, size_t off) const noexcept {
 287         Read(state.chunk_pos, off);
 288         ReadPackU(state.block_pos, off + 12);
 289         Read(state.velocity, off + 18);
 290         Read(state.orient, off + 30);
 291         state.block_pos *= 16.0f;
 292 }
 293
 294 void Packet::Payload::Write(const EntityState &state, const glm::ivec3 &base, size_t off) noexcept {
 295         WritePackB(state.chunk_pos - base, off);
 296         WritePackU(state.block_pos * (1.0f / 16.0f), off + 3);
 297         Write(state.velocity, off + 9);
 298         Write(state.orient, off + 21);
 299 }
 300
 301 void Packet::Payload::Read(EntityState &state, const glm::ivec3 &base, size_t off) const noexcept {
 302         ReadPackB(state.chunk_pos, off);
 303         ReadPackU(state.block_pos, off + 3);
 304         Read(state.velocity, off + 9);
 305         Read(state.orient, off + 21);
 306         state.chunk_pos += base;
 307         state.block_pos *= 16.0f;
 308 }
 309
 310 void Packet::Payload::WritePackN(float val, size_t off) noexcept {
 311         int16_t raw = glm::clamp(glm::round(val * 32767.0f), -32767.0f, 32767.0f);
 312         Write(raw, off);
 313 }
 314
 315 void Packet::Payload::WritePackB(const glm::ivec3 &val, size_t off) noexcept {
 316         Write(int8_t(val.x), off);
 317         Write(int8_t(val.y), off + 1);
 318         Write(int8_t(val.z), off + 2);
 319 }
 320
 321 void Packet::Payload::ReadPackB(glm::ivec3 &val, size_t off) const noexcept {
 322         int8_t conv = 0;
 323         Read(conv, off);
 324         val.x = conv;
 325         Read(conv, off + 1);
 326         val.y = conv;
 327         Read(conv, off + 2);
 328         val.z = conv;
 329 }
 330
 331 void Packet::Payload::ReadPackN(float &val, size_t off) const noexcept {
 332         int16_t raw = 0;
 333         Read(raw, off);
 334         val = raw * (1.0f/32767.0f);
 335 }
 336
 337 void Packet::Payload::WritePackN(const glm::vec3 &val, size_t off) noexcept {
 338         WritePackN(val.x, off);
 339         WritePackN(val.y, off + 2);
 340         WritePackN(val.z, off + 4);
 341 }
 342
 343 void Packet::Payload::ReadPackN(glm::vec3 &val, size_t off) const noexcept {
 344         ReadPackN(val.x, off);
 345         ReadPackN(val.y, off + 2);
 346         ReadPackN(val.z, off + 4);
 347 }
 348
 349 void Packet::Payload::WritePackU(float val, size_t off) noexcept {
 350         uint16_t raw = glm::clamp(glm::round(val * 65535.0f), 0.0f, 65535.0f);
 351         Write(raw, off);
 352 }
 353
 354 void Packet::Payload::ReadPackU(float &val, size_t off) const noexcept {
 355         uint16_t raw = 0;
 356         Read(raw, off);
 357         val = raw * (1.0f/65535.0f);
 358 }
 359
 360 void Packet::Payload::WritePackU(const glm::vec3 &val, size_t off) noexcept {
 361         WritePackU(val.x, off);
 362         WritePackU(val.y, off + 2);
 363         WritePackU(val.z, off + 4);
 364 }
 365
 366 void Packet::Payload::ReadPackU(glm::vec3 &val, size_t off) const noexcept {
 367         ReadPackU(val.x, off);
 368         ReadPackU(val.y, off + 2);
 369         ReadPackU(val.z, off + 4);
 370 }
 371
 372
 373 void Packet::Login::WritePlayerName(const string &name) noexcept {
 374         WriteString(name, 0, 32);
 375 }
 376
 377 void Packet::Login::ReadPlayerName(string &name) const noexcept {
 378         ReadString(name, 0, 32);
 379 }
 380
 381 void Packet::Join::WritePlayer(const Entity &player) noexcept {
 382         Write(player.ID(), 0);
 383         Write(player.GetState(), 4);
 384 }
 385
 386 void Packet::Join::ReadPlayerID(uint32_t &id) const noexcept {
 387         Read(id, 0);
 388 }
 389
 390 void Packet::Join::ReadPlayerState(EntityState &state) const noexcept {
 391         Read(state, 4);
 392 }
 393
 394 void Packet::Join::WriteWorldName(const string &name) noexcept {
 395         WriteString(name, 54, 32);
 396 }
 397
 398 void Packet::Join::ReadWorldName(string &name) const noexcept {
 399         ReadString(name, 54, 32);
 400 }
 401
 402 void Packet::PlayerUpdate::WritePredictedState(const EntityState &state) noexcept {
 403         Write(state, 0);
 404 }
 405
 406 void Packet::PlayerUpdate::ReadPredictedState(EntityState &state) const noexcept {
 407         Read(state, 0);
 408 }
 409
 410 void Packet::PlayerUpdate::WriteMovement(const glm::vec3 &mov) noexcept {
 411         WritePackN(mov, 50);
 412 }
 413
 414 void Packet::PlayerUpdate::ReadMovement(glm::vec3 &mov) const noexcept {
 415         ReadPackN(mov, 50);
 416 }
 417
 418 void Packet::PlayerUpdate::WritePitch(float pitch) noexcept {
 419         float conv = pitch * PI_0p5_inv;
 420         WritePackN(conv, 56);
 421 }
 422
 423 void Packet::PlayerUpdate::ReadPitch(float &pitch) const noexcept {
 424         ReadPackN(pitch, 56);
 425         pitch *= PI_0p5;
 426 }
 427
 428 void Packet::PlayerUpdate::WriteYaw(float yaw) noexcept {
 429         float conv = yaw * PI_inv;
 430         WritePackN(conv, 58);
 431 }
 432
 433 void Packet::PlayerUpdate::ReadYaw(float &yaw) const noexcept {
 434         ReadPackN(yaw, 58);
 435         yaw *= PI;
 436 }
 437
 438 void Packet::PlayerUpdate::WriteActions(uint8_t actions) noexcept {
 439         Write(actions, 60);
 440 }
 441
 442 void Packet::PlayerUpdate::ReadActions(uint8_t &actions) const noexcept {
 443         Read(actions, 60);
 444 }
 445
 446 void Packet::PlayerUpdate::WriteSlot(uint8_t slot) noexcept {
 447         Write(slot, 61);
 448 }
 449
 450 void Packet::PlayerUpdate::ReadSlot(uint8_t &slot) const noexcept {
 451         Read(slot, 61);
 452 }
 453
 454 void Packet::SpawnEntity::WriteEntity(const Entity &e) noexcept {
 455         Write(e.ID(), 0);
 456         if (e.GetModel()) {
 457                 Write(e.GetModel().GetModel().ID(), 4);
 458         } else {
 459                 Write(uint32_t(0), 4);
 460         }
 461         Write(e.GetState(), 8);
 462         Write(e.Bounds(), 58);
 463         uint32_t flags = 0;
 464         if (e.WorldCollidable()) {
 465                 flags |= 1;
 466         }
 467         Write(flags, 82);
 468         WriteString(e.Name(), 86, 32);
 469 }
 470
 471 void Packet::SpawnEntity::ReadEntityID(uint32_t &id) const noexcept {
 472         Read(id, 0);
 473 }
 474
 475 void Packet::SpawnEntity::ReadModelID(uint32_t &id) const noexcept {
 476         Read(id, 4);
 477 }
 478
 479 void Packet::SpawnEntity::ReadEntity(Entity &e) const noexcept {
 480         EntityState state;
 481         AABB bounds;
 482         uint32_t flags = 0;
 483         string name;
 484
 485         Read(state, 8);
 486         Read(bounds, 58);
 487         Read(flags, 82);
 488         ReadString(name, 86, 32);
 489
 490         e.SetState(state);
 491         e.Bounds(bounds);
 492         e.WorldCollidable(flags & 1);
 493         e.Name(name);
 494 }
 495
 496 void Packet::DespawnEntity::WriteEntityID(uint32_t id) noexcept {
 497         Write(id, 0);
 498 }
 499
 500 void Packet::DespawnEntity::ReadEntityID(uint32_t &id) const noexcept {
 501         Read(id, 0);
 502 }
 503
 504 void Packet::EntityUpdate::WriteEntityCount(uint32_t count) noexcept {
 505         Write(count, 0);
 506 }
 507
 508 void Packet::EntityUpdate::ReadEntityCount(uint32_t &count) const noexcept {
 509         Read(count, 0);
 510 }
 511
 512 void Packet::EntityUpdate::WriteChunkBase(const glm::ivec3 &base) noexcept {
 513         Write(base, 4);
 514 }
 515
 516 void Packet::EntityUpdate::ReadChunkBase(glm::ivec3 &base) const noexcept {
 517         Read(base, 4);
 518 }
 519
 520 void Packet::EntityUpdate::WriteEntity(const Entity &entity, const glm::ivec3 &base, uint32_t num) noexcept {
 521         uint32_t off = GetSize(num);
 522
 523         Write(entity.ID(), off);
 524         Write(entity.GetState(), base, off + 4);
 525 }
 526
 527 void Packet::EntityUpdate::ReadEntityID(uint32_t &id, uint32_t num) const noexcept {
 528         uint32_t off = GetSize(num);
 529         Read(id, off);
 530 }
 531
 532 void Packet::EntityUpdate::ReadEntityState(EntityState &state, const glm::ivec3 &base, uint32_t num) const noexcept {
 533         uint32_t off = GetSize(num);
 534         Read(state, base, off + 4);
 535 }
 536
 537 void Packet::PlayerCorrection::WritePacketSeq(std::uint16_t s) noexcept {
 538         Write(s, 0);
 539 }
 540
 541 void Packet::PlayerCorrection::ReadPacketSeq(std::uint16_t &s) const noexcept {
 542         Read(s, 0);
 543 }
 544
 545 void Packet::PlayerCorrection::WritePlayer(const Entity &player) noexcept {
 546         Write(player.GetState(), 2);
 547 }
 548
 549 void Packet::PlayerCorrection::ReadPlayerState(EntityState &state) const noexcept {
 550         Read(state, 2);
 551 }
 552
 553 void Packet::ChunkBegin::WriteTransmissionId(uint32_t id) noexcept {
 554         Write(id, 0);
 555 }
 556
 557 void Packet::ChunkBegin::ReadTransmissionId(uint32_t &id) const noexcept {
 558         Read(id, 0);
 559 }
 560
 561 void Packet::ChunkBegin::WriteFlags(uint32_t f) noexcept {
 562         Write(f, 4);
 563 }
 564
 565 void Packet::ChunkBegin::ReadFlags(uint32_t &f) const noexcept {
 566         Read(f, 4);
 567 }
 568
 569 void Packet::ChunkBegin::WriteChunkCoords(const glm::ivec3 &pos) noexcept {
 570         Write(pos, 8);
 571 }
 572
 573 void Packet::ChunkBegin::ReadChunkCoords(glm::ivec3 &pos) const noexcept {
 574         Read(pos, 8);
 575 }
 576
 577 void Packet::ChunkBegin::WriteDataSize(uint32_t s) noexcept {
 578         Write(s, 20);
 579 }
 580
 581 void Packet::ChunkBegin::ReadDataSize(uint32_t &s) const noexcept {
 582         Read(s, 20);
 583 }
 584
 585 void Packet::ChunkData::WriteTransmissionId(uint32_t id) noexcept {
 586         Write(id, 0);
 587 }
 588
 589 void Packet::ChunkData::ReadTransmissionId(uint32_t &id) const noexcept {
 590         Read(id, 0);
 591 }
 592
 593 void Packet::ChunkData::WriteDataOffset(uint32_t o) noexcept {
 594         Write(o, 4);
 595 }
 596
 597 void Packet::ChunkData::ReadDataOffset(uint32_t &o) const noexcept {
 598         Read(o, 4);
 599 }
 600
 601 void Packet::ChunkData::WriteDataSize(uint32_t s) noexcept {
 602         Write(s, 8);
 603 }
 604
 605 void Packet::ChunkData::ReadDataSize(uint32_t &s) const noexcept {
 606         Read(s, 8);
 607 }
 608
 609 void Packet::ChunkData::WriteData(const uint8_t *d, size_t l) noexcept {
 610         size_t len = min(length - 12, l);
 611         memcpy(&data[12], d, len);
 612 }
 613
 614 void Packet::ChunkData::ReadData(uint8_t *d, size_t l) const noexcept {
 615         size_t len = min(length - 12, l);
 616         memcpy(d, &data[12], len);
 617 }
 618
 619 void Packet::BlockUpdate::WriteChunkCoords(const glm::ivec3 &coords) noexcept {
 620         Write(coords, 0);
 621 }
 622
 623 void Packet::BlockUpdate::ReadChunkCoords(glm::ivec3 &coords) const noexcept {
 624         Read(coords, 0);
 625 }
 626
 627 void Packet::BlockUpdate::WriteBlockCount(uint32_t count) noexcept {
 628         Write(count, 12);
 629 }
 630
 631 void Packet::BlockUpdate::ReadBlockCount(uint32_t &count) const noexcept {
 632         Read(count, 12);
 633 }
 634
 635 void Packet::BlockUpdate::WriteIndex(uint16_t index, uint32_t num) noexcept {
 636         uint32_t off = GetSize(num);
 637         Write(index, off);
 638 }
 639
 640 void Packet::BlockUpdate::ReadIndex(uint16_t &index, uint32_t num) const noexcept {
 641         uint32_t off = GetSize(num);
 642         Read(index, off);
 643 }
 644
 645 void Packet::BlockUpdate::WriteBlock(const Block &block, uint32_t num) noexcept {
 646         uint32_t off = GetSize(num) + 2;
 647         Write(block, off);
 648 }
 649
 650 void Packet::BlockUpdate::ReadBlock(Block &block, uint32_t num) const noexcept {
 651         uint32_t off = GetSize(num) + 2;
 652         Read(block, off);
 653 }
 654
 655 void Packet::Message::WriteType(uint8_t type) noexcept {
 656         Write(type, 0);
 657 }
 658
 659 void Packet::Message::ReadType(uint8_t &type) const noexcept {
 660         Read(type, 0);
 661 }
 662
 663 void Packet::Message::WriteReferral(uint32_t ref) noexcept {
 664         Write(ref, 1);
 665 }
 666
 667 void Packet::Message::ReadReferral(uint32_t &ref) const noexcept {
 668         Read(ref, 1);
 669 }
 670
 671 void Packet::Message::WriteMessage(const string &msg) noexcept {
 672         WriteString(msg, 5, MAX_MESSAGE_LEN);
 673 }
 674
 675 void Packet::Message::ReadMessage(string &msg) const noexcept {
 676         ReadString(msg, 5, MAX_MESSAGE_LEN);
 677 }
 678
 679
 680 void ConnectionHandler::Handle(const UDPpacket &udp_pack) {
 681         const Packet &pack = *reinterpret_cast<const Packet *>(udp_pack.data);
 682         switch (pack.Type()) {
 683                 case Packet::Ping::TYPE:
 684                         On(Packet::As<Packet::Ping>(udp_pack));
 685                         break;
 686                 case Packet::Login::TYPE:
 687                         On(Packet::As<Packet::Login>(udp_pack));
 688                         break;
 689                 case Packet::Join::TYPE:
 690                         On(Packet::As<Packet::Join>(udp_pack));
 691                         break;
 692                 case Packet::Part::TYPE:
 693                         On(Packet::As<Packet::Part>(udp_pack));
 694                         break;
 695                 case Packet::PlayerUpdate::TYPE:
 696                         On(Packet::As<Packet::PlayerUpdate>(udp_pack));
 697                         break;
 698                 case Packet::SpawnEntity::TYPE:
 699                         On(Packet::As<Packet::SpawnEntity>(udp_pack));
 700                         break;
 701                 case Packet::DespawnEntity::TYPE:
 702                         On(Packet::As<Packet::DespawnEntity>(udp_pack));
 703                         break;
 704                 case Packet::EntityUpdate::TYPE:
 705                         On(Packet::As<Packet::EntityUpdate>(udp_pack));
 706                         break;
 707                 case Packet::PlayerCorrection::TYPE:
 708                         On(Packet::As<Packet::PlayerCorrection>(udp_pack));
 709                         break;
 710                 case Packet::ChunkBegin::TYPE:
 711                         On(Packet::As<Packet::ChunkBegin>(udp_pack));
 712                         break;
 713                 case Packet::ChunkData::TYPE:
 714                         On(Packet::As<Packet::ChunkData>(udp_pack));
 715                         break;
 716                 case Packet::BlockUpdate::TYPE:
 717                         On(Packet::As<Packet::BlockUpdate>(udp_pack));
 718                         break;
 719                 case Packet::Message::TYPE:
 720                         On(Packet::As<Packet::Message>(udp_pack));
 721                         break;
 722                 default:
 723                         // drop unknown or unhandled packets
 724                         break;
 725         }
 726 }
 727
 728 }