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         if (HasHandler()) {
  88                 Handler().PacketSent(seq);
  89         }
  90
  91         FlagSend();
  92         return seq;
  93 }
  94
  95 void Connection::Received(const UDPpacket &udp_pack) {
  96         Packet &pack = *reinterpret_cast<Packet *>(udp_pack.data);
  97
  98         // ack to the remote
  99         int16_t diff = int16_t(pack.header.ctrl.seq) - int16_t(ctrl_out.ack);
 100         if (diff > 0) {
 101                 if (diff >= 32) {
 102                         ctrl_out.hist = 0;
 103                 } else {
 104                         ctrl_out.hist <<= diff;
 105                         ctrl_out.hist |= 1 << (diff - 1);
 106                 }
 107         } else if (diff < 0 && diff >= -32) {
 108                 ctrl_out.hist |= 1 << (-diff - 1);
 109         }
 110         ctrl_out.ack = pack.header.ctrl.seq;
 111         FlagRecv();
 112
 113         if (!HasHandler()) {
 114                 return;
 115         }
 116
 117         Packet::TControl ctrl_new = pack.header.ctrl;
 118         Handler().Handle(udp_pack);
 119
 120         if (diff > 0) {
 121                 // if the packet holds more recent information
 122                 // check if remote failed to ack one of our packets
 123                 diff = int16_t(ctrl_new.ack) - int16_t(ctrl_in.ack);
 124                 // should always be true, but you never know…
 125                 if (diff > 0) {
 126                         for (int i = 0; i < diff; ++i) {
 127                                 if (i > 32 || (i < 32 && (ctrl_in.hist & (1 << (31 - i))) == 0)) {
 128                                         Handler().PacketLost(ctrl_in.ack - 32 + i);
 129                                 }
 130                         }
 131                 }
 132                 // check for newly ack'd packets
 133                 for (uint16_t s = ctrl_new.AckBegin(); s != ctrl_new.AckEnd(); --s) {
 134                         if (ctrl_new.Acks(s) && !ctrl_in.Acks(s)) {
 135                                 Handler().PacketReceived(s);
 136                         }
 137                 }
 138                 ctrl_in = ctrl_new;
 139         }
 140 }
 141
 142 bool Packet::TControl::Acks(uint16_t s) const noexcept {
 143         int16_t diff = int16_t(ack) - int16_t(s);
 144         if (diff == 0) return true;
 145         if (diff < 0 || diff > 32) return false;
 146         return (hist & (1 << (diff - 1))) != 0;
 147 }
 148
 149 uint16_t Connection::SendPing(UDPpacket &udp_pack, UDPsocket sock) {
 150         Packet::Make<Packet::Ping>(udp_pack);
 151         return Send(udp_pack, sock);
 152 }
 153
 154
 155 ConnectionHandler::ConnectionHandler()
 156 : packets_lost(0)
 157 , packets_received(0)
 158 , packet_loss(0.0f)
 159 , stamp_cursor(15)
 160 , stamp_last(0)
 161 , rtt(64.0f) {
 162         Uint32 now = SDL_GetTicks();
 163         for (Uint32 &s : stamps) {
 164                 s = now;
 165         }
 166 }
 167
 168 void ConnectionHandler::PacketSent(uint16_t seq) {
 169         if (!SamplePacket(seq)) {
 170                 return;
 171         }
 172         stamp_cursor = (stamp_cursor + 1) % 16;
 173         stamps[stamp_cursor] = SDL_GetTicks();
 174         stamp_last = seq;
 175 }
 176
 177 void ConnectionHandler::PacketLost(uint16_t seq) {
 178         OnPacketLost(seq);
 179         ++packets_lost;
 180         UpdatePacketLoss();
 181         UpdateRTT(seq);
 182 }
 183
 184 void ConnectionHandler::PacketReceived(uint16_t seq) {
 185         OnPacketReceived(seq);
 186         ++packets_received;
 187         UpdatePacketLoss();
 188         UpdateRTT(seq);
 189 }
 190
 191 void ConnectionHandler::UpdatePacketLoss() noexcept {
 192         unsigned int packets_total = packets_lost + packets_received;
 193         if (packets_total >= 256) {
 194                 packet_loss = float(packets_lost) / float(packets_total);
 195                 packets_lost = 0;
 196                 packets_received = 0;
 197         }
 198 }
 199
 200 void ConnectionHandler::UpdateRTT(std::uint16_t seq) noexcept {
 201         if (!SamplePacket(seq)) return;
 202         int diff = HeadDiff(seq);
 203         if (diff > 0 || diff < -15) {
 204                 // packet outside observed time frame
 205                 return;
 206         }
 207         int cur_rtt = SDL_GetTicks() - stamps[(stamp_cursor + diff + 16) % 16];
 208         rtt += (cur_rtt - rtt) * 0.1f;
 209 }
 210
 211 bool ConnectionHandler::SamplePacket(std::uint16_t seq) const noexcept {
 212         // only sample every eighth packet
 213         return seq % 8 == 0;
 214 }
 215
 216 int ConnectionHandler::HeadDiff(std::uint16_t seq) const noexcept {
 217         int16_t diff = int16_t(seq) - int16_t(stamp_last);
 218         return diff / 8;
 219 }
 220
 221
 222 ostream &operator <<(ostream &out, const IPaddress &addr) {
 223         const unsigned char *host = reinterpret_cast<const unsigned char *>(&addr.host);
 224         out << int(host[0])
 225                 << '.' << int(host[1])
 226                 << '.' << int(host[2])
 227                 << '.' << int(host[3]);
 228         if (addr.port) {
 229                 out << ':' << SDLNet_Read16(&addr.port);
 230         }
 231         return out;
 232 }
 233
 234
 235 const char *Packet::Type2String(uint8_t t) noexcept {
 236         switch (t) {
 237                 case Ping::TYPE:
 238                         return "Ping";
 239                 case Login::TYPE:
 240                         return "Login";
 241                 case Join::TYPE:
 242                         return "Join";
 243                 case Part::TYPE:
 244                         return "Part";
 245                 case PlayerUpdate::TYPE:
 246                         return "PlayerUpdate";
 247                 case SpawnEntity::TYPE:
 248                         return "SpawnEntity";
 249                 case DespawnEntity::TYPE:
 250                         return "DespawnEntity";
 251                 case EntityUpdate::TYPE:
 252                         return "EntityUpdate";
 253                 case PlayerCorrection::TYPE:
 254                         return "PlayerCorrection";
 255                 case ChunkBegin::TYPE:
 256                         return "ChunkBegin";
 257                 case ChunkData::TYPE:
 258                         return "ChunkData";
 259                 case BlockUpdate::TYPE:
 260                         return "BlockUpdate";
 261                 case Message::TYPE:
 262                         return "Message";
 263                 default:
 264                         return "Unknown";
 265         }
 266 }
 267
 268 template<class T>
 269 void Packet::Payload::Write(const T &src, size_t off) noexcept {
 270         if ((length - off) < sizeof(T)) {
 271                 // dismiss out of bounds write
 272                 return;
 273         }
 274         *reinterpret_cast<T *>(&data[off]) = src;
 275 }
 276
 277 template<class T>
 278 void Packet::Payload::Read(T &dst, size_t off) const noexcept {
 279         if ((length - off) < sizeof(T)) {
 280                 // dismiss out of bounds read
 281                 return;
 282         }
 283         dst = *reinterpret_cast<T *>(&data[off]);
 284 }
 285
 286 void Packet::Payload::WriteString(const string &src, size_t off, size_t maxlen) noexcept {
 287         uint8_t *dst = &data[off];
 288         size_t len = min(maxlen, length - off);
 289         if (src.size() < len) {
 290                 memset(dst, '\0', len);
 291                 memcpy(dst, src.c_str(), src.size());
 292         } else {
 293                 memcpy(dst, src.c_str(), len);
 294         }
 295 }
 296
 297 void Packet::Payload::ReadString(string &dst, size_t off, size_t maxlen) const noexcept {
 298         size_t len = min(maxlen, length - off);
 299         dst.clear();
 300         dst.reserve(len);
 301         for (size_t i = 0; i < len && data[off + i] != '\0'; ++i) {
 302                 dst.push_back(data[off + i]);
 303         }
 304 }
 305
 306 void Packet::Payload::Write(const glm::quat &val, size_t off) noexcept {
 307         WritePackN(val.w, off);
 308         WritePackN(val.x, off + 2);
 309         WritePackN(val.y, off + 4);
 310         WritePackN(val.z, off + 6);
 311 }
 312
 313 void Packet::Payload::Read(glm::quat &val, size_t off) const noexcept {
 314         ReadPackN(val.w, off);
 315         ReadPackN(val.x, off + 2);
 316         ReadPackN(val.y, off + 4);
 317         ReadPackN(val.z, off + 6);
 318         val = normalize(val);
 319 }
 320
 321 void Packet::Payload::Write(const EntityState &state, size_t off) noexcept {
 322         Write(state.chunk_pos, off);
 323         WritePackU(state.block_pos * (1.0f / 16.0f), off + 12);
 324         Write(state.velocity, off + 18);
 325         Write(state.orient, off + 30);
 326         WritePackN(state.pitch * PI_0p5_inv, off + 38);
 327         WritePackN(state.yaw * PI_inv, off + 40);
 328 }
 329
 330 void Packet::Payload::Read(EntityState &state, size_t off) const noexcept {
 331         Read(state.chunk_pos, off);
 332         ReadPackU(state.block_pos, off + 12);
 333         Read(state.velocity, off + 18);
 334         Read(state.orient, off + 30);
 335         ReadPackN(state.pitch, off + 38);
 336         ReadPackN(state.yaw, off + 40);
 337         state.block_pos *= 16.0f;
 338         state.pitch *= PI_0p5;
 339         state.yaw *= PI;
 340 }
 341
 342 void Packet::Payload::Write(const EntityState &state, const glm::ivec3 &base, size_t off) noexcept {
 343         WritePackB(state.chunk_pos - base, off);
 344         WritePackU(state.block_pos * (1.0f / 16.0f), off + 3);
 345         Write(state.velocity, off + 9);
 346         Write(state.orient, off + 21);
 347         WritePackN(state.pitch * PI_0p5_inv, off + 29);
 348         WritePackN(state.yaw * PI_inv, off + 31);
 349 }
 350
 351 void Packet::Payload::Read(EntityState &state, const glm::ivec3 &base, size_t off) const noexcept {
 352         ReadPackB(state.chunk_pos, off);
 353         ReadPackU(state.block_pos, off + 3);
 354         Read(state.velocity, off + 9);
 355         Read(state.orient, off + 21);
 356         ReadPackN(state.pitch, off + 29);
 357         ReadPackN(state.yaw, off + 31);
 358         state.chunk_pos += base;
 359         state.block_pos *= 16.0f;
 360         state.pitch *= PI_0p5;
 361         state.yaw *= PI;
 362 }
 363
 364 void Packet::Payload::WritePackB(const glm::ivec3 &val, size_t off) noexcept {
 365         Write(int8_t(val.x), off);
 366         Write(int8_t(val.y), off + 1);
 367         Write(int8_t(val.z), off + 2);
 368 }
 369
 370 void Packet::Payload::ReadPackB(glm::ivec3 &val, size_t off) const noexcept {
 371         int8_t conv = 0;
 372         Read(conv, off);
 373         val.x = conv;
 374         Read(conv, off + 1);
 375         val.y = conv;
 376         Read(conv, off + 2);
 377         val.z = conv;
 378 }
 379
 380 void Packet::Payload::WritePackN(float val, size_t off) noexcept {
 381         int16_t raw = glm::clamp(glm::round(val * 32767.0f), -32767.0f, 32767.0f);
 382         Write(raw, off);
 383 }
 384
 385 void Packet::Payload::ReadPackN(float &val, size_t off) const noexcept {
 386         int16_t raw = 0;
 387         Read(raw, off);
 388         val = raw * (1.0f/32767.0f);
 389 }
 390
 391 void Packet::Payload::WritePackN(const glm::vec3 &val, size_t off) noexcept {
 392         WritePackN(val.x, off);
 393         WritePackN(val.y, off + 2);
 394         WritePackN(val.z, off + 4);
 395 }
 396
 397 void Packet::Payload::ReadPackN(glm::vec3 &val, size_t off) const noexcept {
 398         ReadPackN(val.x, off);
 399         ReadPackN(val.y, off + 2);
 400         ReadPackN(val.z, off + 4);
 401 }
 402
 403 void Packet::Payload::WritePackU(float val, size_t off) noexcept {
 404         uint16_t raw = glm::clamp(glm::round(val * 65535.0f), 0.0f, 65535.0f);
 405         Write(raw, off);
 406 }
 407
 408 void Packet::Payload::ReadPackU(float &val, size_t off) const noexcept {
 409         uint16_t raw = 0;
 410         Read(raw, off);
 411         val = raw * (1.0f/65535.0f);
 412 }
 413
 414 void Packet::Payload::WritePackU(const glm::vec3 &val, size_t off) noexcept {
 415         WritePackU(val.x, off);
 416         WritePackU(val.y, off + 2);
 417         WritePackU(val.z, off + 4);
 418 }
 419
 420 void Packet::Payload::ReadPackU(glm::vec3 &val, size_t off) const noexcept {
 421         ReadPackU(val.x, off);
 422         ReadPackU(val.y, off + 2);
 423         ReadPackU(val.z, off + 4);
 424 }
 425
 426
 427 void Packet::Login::WritePlayerName(const string &name) noexcept {
 428         WriteString(name, 0, 32);
 429 }
 430
 431 void Packet::Login::ReadPlayerName(string &name) const noexcept {
 432         ReadString(name, 0, 32);
 433 }
 434
 435 void Packet::Join::WritePlayer(const Entity &player) noexcept {
 436         Write(player.ID(), 0);
 437         Write(player.GetState(), 4);
 438 }
 439
 440 void Packet::Join::ReadPlayerID(uint32_t &id) const noexcept {
 441         Read(id, 0);
 442 }
 443
 444 void Packet::Join::ReadPlayerState(EntityState &state) const noexcept {
 445         Read(state, 4);
 446 }
 447
 448 void Packet::Join::WriteWorldName(const string &name) noexcept {
 449         WriteString(name, 46, 32);
 450 }
 451
 452 void Packet::Join::ReadWorldName(string &name) const noexcept {
 453         ReadString(name, 46, 32);
 454 }
 455
 456 void Packet::PlayerUpdate::WritePredictedState(const EntityState &state) noexcept {
 457         Write(state, 0);
 458 }
 459
 460 void Packet::PlayerUpdate::ReadPredictedState(EntityState &state) const noexcept {
 461         Read(state, 0);
 462 }
 463
 464 void Packet::PlayerUpdate::WriteMovement(const glm::vec3 &mov) noexcept {
 465         WritePackN(mov, 42);
 466 }
 467
 468 void Packet::PlayerUpdate::ReadMovement(glm::vec3 &mov) const noexcept {
 469         ReadPackN(mov, 42);
 470 }
 471
 472 void Packet::PlayerUpdate::WriteActions(uint8_t actions) noexcept {
 473         Write(actions, 48);
 474 }
 475
 476 void Packet::PlayerUpdate::ReadActions(uint8_t &actions) const noexcept {
 477         Read(actions, 48);
 478 }
 479
 480 void Packet::PlayerUpdate::WriteSlot(uint8_t slot) noexcept {
 481         Write(slot, 49);
 482 }
 483
 484 void Packet::PlayerUpdate::ReadSlot(uint8_t &slot) const noexcept {
 485         Read(slot, 49);
 486 }
 487
 488 void Packet::SpawnEntity::WriteEntity(const Entity &e) noexcept {
 489         Write(e.ID(), 0);
 490         if (e.GetModel()) {
 491                 Write(e.GetModel().GetModel().ID(), 4);
 492         } else {
 493                 Write(uint32_t(0), 4);
 494         }
 495         Write(e.GetState(), 8);
 496         Write(e.Bounds(), 50);
 497         uint32_t flags = 0;
 498         if (e.WorldCollidable()) {
 499                 flags |= 1;
 500         }
 501         Write(flags, 74);
 502         WriteString(e.Name(), 78, 32);
 503 }
 504
 505 void Packet::SpawnEntity::ReadEntityID(uint32_t &id) const noexcept {
 506         Read(id, 0);
 507 }
 508
 509 void Packet::SpawnEntity::ReadModelID(uint32_t &id) const noexcept {
 510         Read(id, 4);
 511 }
 512
 513 void Packet::SpawnEntity::ReadEntity(Entity &e) const noexcept {
 514         EntityState state;
 515         AABB bounds;
 516         uint32_t flags = 0;
 517         string name;
 518
 519         Read(state, 8);
 520         Read(bounds, 50);
 521         Read(flags, 74);
 522         ReadString(name, 78, 32);
 523
 524         e.SetState(state);
 525         e.Bounds(bounds);
 526         e.WorldCollidable(flags & 1);
 527         e.Name(name);
 528 }
 529
 530 void Packet::DespawnEntity::WriteEntityID(uint32_t id) noexcept {
 531         Write(id, 0);
 532 }
 533
 534 void Packet::DespawnEntity::ReadEntityID(uint32_t &id) const noexcept {
 535         Read(id, 0);
 536 }
 537
 538 void Packet::EntityUpdate::WriteEntityCount(uint32_t count) noexcept {
 539         Write(count, 0);
 540 }
 541
 542 void Packet::EntityUpdate::ReadEntityCount(uint32_t &count) const noexcept {
 543         Read(count, 0);
 544 }
 545
 546 void Packet::EntityUpdate::WriteChunkBase(const glm::ivec3 &base) noexcept {
 547         Write(base, 4);
 548 }
 549
 550 void Packet::EntityUpdate::ReadChunkBase(glm::ivec3 &base) const noexcept {
 551         Read(base, 4);
 552 }
 553
 554 void Packet::EntityUpdate::WriteEntity(const Entity &entity, const glm::ivec3 &base, uint32_t num) noexcept {
 555         uint32_t off = GetSize(num);
 556
 557         Write(entity.ID(), off);
 558         Write(entity.GetState(), base, off + 4);
 559 }
 560
 561 void Packet::EntityUpdate::ReadEntityID(uint32_t &id, uint32_t num) const noexcept {
 562         uint32_t off = GetSize(num);
 563         Read(id, off);
 564 }
 565
 566 void Packet::EntityUpdate::ReadEntityState(EntityState &state, const glm::ivec3 &base, uint32_t num) const noexcept {
 567         uint32_t off = GetSize(num);
 568         Read(state, base, off + 4);
 569 }
 570
 571 void Packet::PlayerCorrection::WritePacketSeq(std::uint16_t s) noexcept {
 572         Write(s, 0);
 573 }
 574
 575 void Packet::PlayerCorrection::ReadPacketSeq(std::uint16_t &s) const noexcept {
 576         Read(s, 0);
 577 }
 578
 579 void Packet::PlayerCorrection::WritePlayer(const Entity &player) noexcept {
 580         Write(player.GetState(), 2);
 581 }
 582
 583 void Packet::PlayerCorrection::ReadPlayerState(EntityState &state) const noexcept {
 584         Read(state, 2);
 585 }
 586
 587 void Packet::ChunkBegin::WriteTransmissionId(uint32_t id) noexcept {
 588         Write(id, 0);
 589 }
 590
 591 void Packet::ChunkBegin::ReadTransmissionId(uint32_t &id) const noexcept {
 592         Read(id, 0);
 593 }
 594
 595 void Packet::ChunkBegin::WriteFlags(uint32_t f) noexcept {
 596         Write(f, 4);
 597 }
 598
 599 void Packet::ChunkBegin::ReadFlags(uint32_t &f) const noexcept {
 600         Read(f, 4);
 601 }
 602
 603 void Packet::ChunkBegin::WriteChunkCoords(const glm::ivec3 &pos) noexcept {
 604         Write(pos, 8);
 605 }
 606
 607 void Packet::ChunkBegin::ReadChunkCoords(glm::ivec3 &pos) const noexcept {
 608         Read(pos, 8);
 609 }
 610
 611 void Packet::ChunkBegin::WriteDataSize(uint32_t s) noexcept {
 612         Write(s, 20);
 613 }
 614
 615 void Packet::ChunkBegin::ReadDataSize(uint32_t &s) const noexcept {
 616         Read(s, 20);
 617 }
 618
 619 void Packet::ChunkData::WriteTransmissionId(uint32_t id) noexcept {
 620         Write(id, 0);
 621 }
 622
 623 void Packet::ChunkData::ReadTransmissionId(uint32_t &id) const noexcept {
 624         Read(id, 0);
 625 }
 626
 627 void Packet::ChunkData::WriteDataOffset(uint32_t o) noexcept {
 628         Write(o, 4);
 629 }
 630
 631 void Packet::ChunkData::ReadDataOffset(uint32_t &o) const noexcept {
 632         Read(o, 4);
 633 }
 634
 635 void Packet::ChunkData::WriteDataSize(uint32_t s) noexcept {
 636         Write(s, 8);
 637 }
 638
 639 void Packet::ChunkData::ReadDataSize(uint32_t &s) const noexcept {
 640         Read(s, 8);
 641 }
 642
 643 void Packet::ChunkData::WriteData(const uint8_t *d, size_t l) noexcept {
 644         size_t len = min(length - 12, l);
 645         memcpy(&data[12], d, len);
 646 }
 647
 648 void Packet::ChunkData::ReadData(uint8_t *d, size_t l) const noexcept {
 649         size_t len = min(length - 12, l);
 650         memcpy(d, &data[12], len);
 651 }
 652
 653 void Packet::BlockUpdate::WriteChunkCoords(const glm::ivec3 &coords) noexcept {
 654         Write(coords, 0);
 655 }
 656
 657 void Packet::BlockUpdate::ReadChunkCoords(glm::ivec3 &coords) const noexcept {
 658         Read(coords, 0);
 659 }
 660
 661 void Packet::BlockUpdate::WriteBlockCount(uint32_t count) noexcept {
 662         Write(count, 12);
 663 }
 664
 665 void Packet::BlockUpdate::ReadBlockCount(uint32_t &count) const noexcept {
 666         Read(count, 12);
 667 }
 668
 669 void Packet::BlockUpdate::WriteIndex(uint16_t index, uint32_t num) noexcept {
 670         uint32_t off = GetSize(num);
 671         Write(index, off);
 672 }
 673
 674 void Packet::BlockUpdate::ReadIndex(uint16_t &index, uint32_t num) const noexcept {
 675         uint32_t off = GetSize(num);
 676         Read(index, off);
 677 }
 678
 679 void Packet::BlockUpdate::WriteBlock(const Block &block, uint32_t num) noexcept {
 680         uint32_t off = GetSize(num) + 2;
 681         Write(block, off);
 682 }
 683
 684 void Packet::BlockUpdate::ReadBlock(Block &block, uint32_t num) const noexcept {
 685         uint32_t off = GetSize(num) + 2;
 686         Read(block, off);
 687 }
 688
 689 void Packet::Message::WriteType(uint8_t type) noexcept {
 690         Write(type, 0);
 691 }
 692
 693 void Packet::Message::ReadType(uint8_t &type) const noexcept {
 694         Read(type, 0);
 695 }
 696
 697 void Packet::Message::WriteReferral(uint32_t ref) noexcept {
 698         Write(ref, 1);
 699 }
 700
 701 void Packet::Message::ReadReferral(uint32_t &ref) const noexcept {
 702         Read(ref, 1);
 703 }
 704
 705 void Packet::Message::WriteMessage(const string &msg) noexcept {
 706         WriteString(msg, 5, MAX_MESSAGE_LEN);
 707 }
 708
 709 void Packet::Message::ReadMessage(string &msg) const noexcept {
 710         ReadString(msg, 5, MAX_MESSAGE_LEN);
 711 }
 712
 713
 714 void ConnectionHandler::Handle(const UDPpacket &udp_pack) {
 715         const Packet &pack = *reinterpret_cast<const Packet *>(udp_pack.data);
 716         switch (pack.Type()) {
 717                 case Packet::Ping::TYPE:
 718                         On(Packet::As<Packet::Ping>(udp_pack));
 719                         break;
 720                 case Packet::Login::TYPE:
 721                         On(Packet::As<Packet::Login>(udp_pack));
 722                         break;
 723                 case Packet::Join::TYPE:
 724                         On(Packet::As<Packet::Join>(udp_pack));
 725                         break;
 726                 case Packet::Part::TYPE:
 727                         On(Packet::As<Packet::Part>(udp_pack));
 728                         break;
 729                 case Packet::PlayerUpdate::TYPE:
 730                         On(Packet::As<Packet::PlayerUpdate>(udp_pack));
 731                         break;
 732                 case Packet::SpawnEntity::TYPE:
 733                         On(Packet::As<Packet::SpawnEntity>(udp_pack));
 734                         break;
 735                 case Packet::DespawnEntity::TYPE:
 736                         On(Packet::As<Packet::DespawnEntity>(udp_pack));
 737                         break;
 738                 case Packet::EntityUpdate::TYPE:
 739                         On(Packet::As<Packet::EntityUpdate>(udp_pack));
 740                         break;
 741                 case Packet::PlayerCorrection::TYPE:
 742                         On(Packet::As<Packet::PlayerCorrection>(udp_pack));
 743                         break;
 744                 case Packet::ChunkBegin::TYPE:
 745                         On(Packet::As<Packet::ChunkBegin>(udp_pack));
 746                         break;
 747                 case Packet::ChunkData::TYPE:
 748                         On(Packet::As<Packet::ChunkData>(udp_pack));
 749                         break;
 750                 case Packet::BlockUpdate::TYPE:
 751                         On(Packet::As<Packet::BlockUpdate>(udp_pack));
 752                         break;
 753                 case Packet::Message::TYPE:
 754                         On(Packet::As<Packet::Message>(udp_pack));
 755                         break;
 756                 default:
 757                         // drop unknown or unhandled packets
 758                         break;
 759         }
 760 }
 761
 762 }