Protocol_1_9.cpp

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// Protocol_1_9.cpp

/*
Implements the 1.9 protocol classes:
    - cProtocol_1_9_0
        - release 1.9 protocol (#107)
    - cProtocol_1_9_1
        - release 1.9.1 protocol (#108)
    - cProtocol_1_9_2
        - release 1.9.2 protocol (#109)
    - cProtocol_1_9_4
        - release 1.9.4 protocol (#110)
*/

#include "Globals.h"
#include "json/json.h"
#include "Protocol_1_9.h"
#include "ChunkDataSerializer.h"
#include "../mbedTLS++/Sha1Checksum.h"
#include "Packetizer.h"

#include "../ClientHandle.h"
#include "../Root.h"
#include "../Server.h"
#include "../World.h"
#include "../StringCompression.h"
#include "../CompositeChat.h"
#include "../Statistics.h"

#include "../WorldStorage/FastNBT.h"

#include "../Entities/ExpOrb.h"
#include "../Entities/Minecart.h"
#include "../Entities/FallingBlock.h"
#include "../Entities/Painting.h"
#include "../Entities/Pickup.h"
#include "../Entities/Player.h"
#include "../Entities/ItemFrame.h"
#include "../Entities/ArrowEntity.h"
#include "../Entities/FireworkEntity.h"
#include "../Entities/SplashPotionEntity.h"

#include "../Items/ItemSpawnEgg.h"

#include "../Mobs/IncludeAllMonsters.h"
#include "../UI/HorseWindow.h"

#include "../BlockEntities/BeaconEntity.h"
#include "../BlockEntities/CommandBlockEntity.h"
#include "../BlockEntities/MobHeadEntity.h"
#include "../BlockEntities/MobSpawnerEntity.h"
#include "../BlockEntities/FlowerPotEntity.h"
#include "../Bindings/PluginManager.h"





static const Int16 SLOT_NUM_OUTSIDE = -999;

static const UInt32 MAIN_HAND = 0;
static const UInt32 OFF_HAND = 1;





#define HANDLE_READ(ByteBuf, Proc, Type, Var) \
    Type Var; \
    do { \
        if (!ByteBuf.Proc(Var))\
        {\
            return;\
        } \
    } while (false)





#define HANDLE_PACKET_READ(ByteBuf, Proc, Type, Var) \
    Type Var; \
    do { \
        { \
            if (!ByteBuf.Proc(Var)) \
            { \
                ByteBuf.CheckValid(); \
                return false; \
            } \
            ByteBuf.CheckValid(); \
        } \
    } while (false)





const int MAX_ENC_LEN = 512;  // Maximum size of the encrypted message; should be 128, but who knows...
const uLongf MAX_COMPRESSED_PACKET_LEN = 200 KiB;  // Maximum size of compressed packets.





// fwd: main.cpp:
extern bool g_ShouldLogCommIn, g_ShouldLogCommOut;





// cProtocol_1_9_0:

cProtocol_1_9_0::cProtocol_1_9_0(cClientHandle * a_Client, const AString & a_ServerAddress, UInt16 a_ServerPort, UInt32 a_State) :
    Super(a_Client),
    m_ServerAddress(a_ServerAddress),
    m_ServerPort(a_ServerPort),
    m_State(a_State),
    m_IsTeleportIdConfirmed(true),
    m_OutstandingTeleportId(0),
    m_ReceivedData(32 KiB),
    m_IsEncrypted(false)
{

    AStringVector Params;
    SplitZeroTerminatedStrings(a_ServerAddress, Params);

    if (Params.size() >= 2)
    {
        m_ServerAddress = Params[0];

        if (Params[1] == "FML")
        {
            LOGD("Forge client connected!");
            m_Client->SetIsForgeClient();
        }
        else if (Params.size() == 4)
        {
            if (cRoot::Get()->GetServer()->ShouldAllowBungeeCord())
            {
                // BungeeCord handling:
                // If BC is setup with ip_forward == true, it sends additional data in the login packet's ServerAddress field:
                // hostname\00ip-address\00uuid\00profile-properties-as-json

                LOGD("Player at %s connected via BungeeCord", Params[1].c_str());

                m_Client->SetIPString(Params[1]);

                cUUID UUID;
                UUID.FromString(Params[2]);
                m_Client->SetUUID(UUID);

                Json::Value root;
                Json::Reader reader;
                if (!reader.parse(Params[3], root))
                {
                    LOGERROR("Unable to parse player properties: '%s'", Params[3]);
                }
                else
                {
                    m_Client->SetProperties(root);
                }
            }
            else
            {
                LOG("BungeeCord is disabled, but client sent additional data, set AllowBungeeCord=1 if you want to allow it");
            }
        }
        else
        {
            LOG("Unknown additional data sent in server address (BungeeCord/FML?): %zu parameters", Params.size());
            // TODO: support FML + BungeeCord? (what parameters does it send in that case?) https://github.com/SpigotMC/BungeeCord/issues/899
        }
    }

    // Create the comm log file, if so requested:
    if (g_ShouldLogCommIn || g_ShouldLogCommOut)
    {
        static int sCounter = 0;
        cFile::CreateFolder("CommLogs");
        AString IP(a_Client->GetIPString());
        ReplaceString(IP, ":", "_");
        AString FileName = Printf("CommLogs/%x_%d__%s.log",
            static_cast<unsigned>(time(nullptr)),
            sCounter++,
            IP.c_str()
        );
        if (!m_CommLogFile.Open(FileName, cFile::fmWrite))
        {
            LOG("Cannot log communication to file, the log file \"%s\" cannot be opened for writing.", FileName.c_str());
        }
    }
}





void cProtocol_1_9_0::DataReceived(const char * a_Data, size_t a_Size)
{
    if (m_IsEncrypted)
    {
        Byte Decrypted[512];
        while (a_Size > 0)
        {
            size_t NumBytes = (a_Size > sizeof(Decrypted)) ? sizeof(Decrypted) : a_Size;
            m_Decryptor.ProcessData(Decrypted, reinterpret_cast<const Byte *>(a_Data), NumBytes);
            AddReceivedData(reinterpret_cast<const char *>(Decrypted), NumBytes);
            a_Size -= NumBytes;
            a_Data += NumBytes;
        }
    }
    else
    {
        AddReceivedData(a_Data, a_Size);
    }
}





void cProtocol_1_9_0::SendAttachEntity(const cEntity & a_Entity, const cEntity & a_Vehicle)
{
    ASSERT(m_State == 3);  // In game mode?
    cPacketizer Pkt(*this, pktAttachEntity);
    Pkt.WriteVarInt32(a_Vehicle.GetUniqueID());
    Pkt.WriteVarInt32(1);  // 1 passenger
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
}





void cProtocol_1_9_0::SendBlockAction(int a_BlockX, int a_BlockY, int a_BlockZ, char a_Byte1, char a_Byte2, BLOCKTYPE a_BlockType)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktBlockAction);
    Pkt.WritePosition64(a_BlockX, a_BlockY, a_BlockZ);
    Pkt.WriteBEInt8(a_Byte1);
    Pkt.WriteBEInt8(a_Byte2);
    Pkt.WriteVarInt32(a_BlockType);
}





void cProtocol_1_9_0::SendBlockBreakAnim(UInt32 a_EntityID, int a_BlockX, int a_BlockY, int a_BlockZ, char a_Stage)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktBlockBreakAnim);
    Pkt.WriteVarInt32(a_EntityID);
    Pkt.WritePosition64(a_BlockX, a_BlockY, a_BlockZ);
    Pkt.WriteBEInt8(a_Stage);
}





void cProtocol_1_9_0::SendBlockChange(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktBlockChange);
    Pkt.WritePosition64(a_BlockX, a_BlockY, a_BlockZ);
    Pkt.WriteVarInt32((static_cast<UInt32>(a_BlockType) << 4) | (static_cast<UInt32>(a_BlockMeta) & 15));
}





void cProtocol_1_9_0::SendBlockChanges(int a_ChunkX, int a_ChunkZ, const sSetBlockVector & a_Changes)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktBlockChanges);
    Pkt.WriteBEInt32(a_ChunkX);
    Pkt.WriteBEInt32(a_ChunkZ);
    Pkt.WriteVarInt32(static_cast<UInt32>(a_Changes.size()));
    for (sSetBlockVector::const_iterator itr = a_Changes.begin(), end = a_Changes.end(); itr != end; ++itr)
    {
        Int16 Coords = static_cast<Int16>(itr->m_RelY | (itr->m_RelZ << 8) | (itr->m_RelX << 12));
        Pkt.WriteBEInt16(Coords);
        Pkt.WriteVarInt32(static_cast<UInt32>(itr->m_BlockType & 0xFFF) << 4 | (itr->m_BlockMeta & 0xF));
    }  // for itr - a_Changes[]
}





void cProtocol_1_9_0::SendCameraSetTo(const cEntity & a_Entity)
{
    cPacketizer Pkt(*this, pktCameraSetTo);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
}





void cProtocol_1_9_0::SendChat(const AString & a_Message, eChatType a_Type)
{
    ASSERT(m_State == 3);  // In game mode?

    SendChatRaw(Printf("{\"text\":\"%s\"}", EscapeString(a_Message).c_str()), a_Type);
}





void cProtocol_1_9_0::SendChat(const cCompositeChat & a_Message, eChatType a_Type, bool a_ShouldUseChatPrefixes)
{
    ASSERT(m_State == 3);  // In game mode?

    SendChatRaw(a_Message.CreateJsonString(a_ShouldUseChatPrefixes), a_Type);
}





void cProtocol_1_9_0::SendChatRaw(const AString & a_MessageRaw, eChatType a_Type)
{
    ASSERT(m_State == 3);  // In game mode?

    // Send the json string to the client:
    cPacketizer Pkt(*this, pktChatRaw);
    Pkt.WriteString(a_MessageRaw);
    Pkt.WriteBEInt8(a_Type);
}





void cProtocol_1_9_0::SendChunkData(int a_ChunkX, int a_ChunkZ, cChunkDataSerializer & a_Serializer)
{
    ASSERT(m_State == 3);  // In game mode?

    // Serialize first, before creating the Packetizer (the packetizer locks a CS)
    // This contains the flags and bitmasks, too
    const AString & ChunkData = a_Serializer.Serialize(cChunkDataSerializer::RELEASE_1_9_0, a_ChunkX, a_ChunkZ, {});

    cCSLock Lock(m_CSPacket);
    SendData(ChunkData.data(), ChunkData.size());
}





void cProtocol_1_9_0::SendCollectEntity(const cEntity & a_Entity, const cPlayer & a_Player, int a_Count)
{
    UNUSED(a_Count);
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktCollectEntity);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    Pkt.WriteVarInt32(a_Player.GetUniqueID());
}





void cProtocol_1_9_0::SendDestroyEntity(const cEntity & a_Entity)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktDestroyEntity);
    Pkt.WriteVarInt32(1);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
}





void cProtocol_1_9_0::SendDetachEntity(const cEntity & a_Entity, const cEntity & a_PreviousVehicle)
{
    ASSERT(m_State == 3);  // In game mode?
    cPacketizer Pkt(*this, pktAttachEntity);
    Pkt.WriteVarInt32(a_PreviousVehicle.GetUniqueID());
    Pkt.WriteVarInt32(0);  // No passangers
}





void cProtocol_1_9_0::SendDisconnect(const AString & a_Reason)
{
    switch (m_State)
    {
        case 2:
        {
            // During login:
            cPacketizer Pkt(*this, pktDisconnectDuringLogin);
            Pkt.WriteString(Printf("{\"text\":\"%s\"}", EscapeString(a_Reason).c_str()));
            break;
        }
        case 3:
        {
            // In-game:
            cPacketizer Pkt(*this, pktDisconnectDuringGame);
            Pkt.WriteString(Printf("{\"text\":\"%s\"}", EscapeString(a_Reason).c_str()));
            break;
        }
    }
}





void cProtocol_1_9_0::SendEditSign(int a_BlockX, int a_BlockY, int a_BlockZ)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEditSign);
    Pkt.WritePosition64(a_BlockX, a_BlockY, a_BlockZ);
}





void cProtocol_1_9_0::SendEntityEffect(const cEntity & a_Entity, int a_EffectID, int a_Amplifier, int a_Duration)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityEffect);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    Pkt.WriteBEUInt8(static_cast<UInt8>(a_EffectID));
    Pkt.WriteBEUInt8(static_cast<UInt8>(a_Amplifier));
    Pkt.WriteVarInt32(static_cast<UInt32>(a_Duration));
    Pkt.WriteBool(false);  // Hide particles
}





void cProtocol_1_9_0::SendEntityEquipment(const cEntity & a_Entity, short a_SlotNum, const cItem & a_Item)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityEquipment);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    // Needs to be adjusted due to the insertion of offhand at slot 1
    if (a_SlotNum > 0)
    {
        a_SlotNum++;
    }
    Pkt.WriteVarInt32(static_cast<UInt32>(a_SlotNum));
    WriteItem(Pkt, a_Item);
}





void cProtocol_1_9_0::SendEntityHeadLook(const cEntity & a_Entity)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityHeadLook);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    Pkt.WriteByteAngle(a_Entity.GetHeadYaw());
}





void cProtocol_1_9_0::SendEntityLook(const cEntity & a_Entity)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityLook);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    Pkt.WriteByteAngle(a_Entity.GetYaw());
    Pkt.WriteByteAngle(a_Entity.GetPitch());
    Pkt.WriteBool(a_Entity.IsOnGround());
}





void cProtocol_1_9_0::SendEntityMetadata(const cEntity & a_Entity)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityMeta);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    WriteEntityMetadata(Pkt, a_Entity);
    Pkt.WriteBEUInt8(0xff);  // The termination byte
}





void cProtocol_1_9_0::SendEntityProperties(const cEntity & a_Entity)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityProperties);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    WriteEntityProperties(Pkt, a_Entity);
}





void cProtocol_1_9_0::SendEntityRelMove(const cEntity & a_Entity, char a_RelX, char a_RelY, char a_RelZ)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityRelMove);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    // TODO: 1.9 changed these from chars to shorts, meaning that there can be more percision and data.  Other code needs to be updated for that.
    Pkt.WriteBEInt16(a_RelX * 128);
    Pkt.WriteBEInt16(a_RelY * 128);
    Pkt.WriteBEInt16(a_RelZ * 128);
    Pkt.WriteBool(a_Entity.IsOnGround());
}





void cProtocol_1_9_0::SendEntityRelMoveLook(const cEntity & a_Entity, char a_RelX, char a_RelY, char a_RelZ)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityRelMoveLook);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    // TODO: 1.9 changed these from chars to shorts, meaning that there can be more percision and data.  Other code needs to be updated for that.
    Pkt.WriteBEInt16(a_RelX * 128);
    Pkt.WriteBEInt16(a_RelY * 128);
    Pkt.WriteBEInt16(a_RelZ * 128);
    Pkt.WriteByteAngle(a_Entity.GetYaw());
    Pkt.WriteByteAngle(a_Entity.GetPitch());
    Pkt.WriteBool(a_Entity.IsOnGround());
}





void cProtocol_1_9_0::SendEntityStatus(const cEntity & a_Entity, char a_Status)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityStatus);
    Pkt.WriteBEUInt32(a_Entity.GetUniqueID());
    Pkt.WriteBEInt8(a_Status);
}





void cProtocol_1_9_0::SendEntityVelocity(const cEntity & a_Entity)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityVelocity);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    // 400 = 8000 / 20 ... Conversion from our speed in m / s to 8000 m / tick
    Pkt.WriteBEInt16(static_cast<Int16>(a_Entity.GetSpeedX() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_Entity.GetSpeedY() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_Entity.GetSpeedZ() * 400));
}





void cProtocol_1_9_0::SendExperience(void)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktExperience);
    cPlayer * Player = m_Client->GetPlayer();
    Pkt.WriteBEFloat(Player->GetXpPercentage());
    Pkt.WriteVarInt32(static_cast<UInt32>(Player->GetXpLevel()));
    Pkt.WriteVarInt32(static_cast<UInt32>(Player->GetCurrentXp()));
}





void cProtocol_1_9_0::SendExperienceOrb(const cExpOrb & a_ExpOrb)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktSpawnExperienceOrb);
    Pkt.WriteVarInt32(a_ExpOrb.GetUniqueID());
    Pkt.WriteBEDouble(a_ExpOrb.GetPosX());
    Pkt.WriteBEDouble(a_ExpOrb.GetPosY());
    Pkt.WriteBEDouble(a_ExpOrb.GetPosZ());
    Pkt.WriteBEInt16(static_cast<Int16>(a_ExpOrb.GetReward()));
}





void cProtocol_1_9_0::SendExplosion(double a_BlockX, double a_BlockY, double a_BlockZ, float a_Radius, const cVector3iArray & a_BlocksAffected, const Vector3d & a_PlayerMotion)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktExplosion);
    Pkt.WriteBEFloat(static_cast<float>(a_BlockX));
    Pkt.WriteBEFloat(static_cast<float>(a_BlockY));
    Pkt.WriteBEFloat(static_cast<float>(a_BlockZ));
    Pkt.WriteBEFloat(static_cast<float>(a_Radius));
    Pkt.WriteBEUInt32(static_cast<UInt32>(a_BlocksAffected.size()));
    for (cVector3iArray::const_iterator itr = a_BlocksAffected.begin(), end = a_BlocksAffected.end(); itr != end; ++itr)
    {
        Pkt.WriteBEInt8(static_cast<Int8>(itr->x));
        Pkt.WriteBEInt8(static_cast<Int8>(itr->y));
        Pkt.WriteBEInt8(static_cast<Int8>(itr->z));
    }  // for itr - a_BlockAffected[]
    Pkt.WriteBEFloat(static_cast<float>(a_PlayerMotion.x));
    Pkt.WriteBEFloat(static_cast<float>(a_PlayerMotion.y));
    Pkt.WriteBEFloat(static_cast<float>(a_PlayerMotion.z));
}





void cProtocol_1_9_0::SendGameMode(eGameMode a_GameMode)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktGameMode);
    Pkt.WriteBEUInt8(3);  // Reason: Change game mode
    Pkt.WriteBEFloat(static_cast<float>(a_GameMode));  // The protocol really represents the value with a float!
}





void cProtocol_1_9_0::SendHealth(void)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktUpdateHealth);
    cPlayer * Player = m_Client->GetPlayer();
    Pkt.WriteBEFloat(static_cast<float>(Player->GetHealth()));
    Pkt.WriteVarInt32(static_cast<UInt32>(Player->GetFoodLevel()));
    Pkt.WriteBEFloat(static_cast<float>(Player->GetFoodSaturationLevel()));
}





void cProtocol_1_9_0::SendHeldItemChange(int a_ItemIndex)
{
    ASSERT((a_ItemIndex >= 0) && (a_ItemIndex <= 8));  // Valid check

    cPacketizer Pkt(*this, pktHeldItemChange);
    cPlayer * Player = m_Client->GetPlayer();
    Pkt.WriteBEInt8(static_cast<Int8>(Player->GetInventory().GetEquippedSlotNum()));
}





void cProtocol_1_9_0::SendHideTitle(void)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktTitle);
    Pkt.WriteVarInt32(3);  // Hide title
}





void cProtocol_1_9_0::SendInventorySlot(char a_WindowID, short a_SlotNum, const cItem & a_Item)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktInventorySlot);
    Pkt.WriteBEInt8(a_WindowID);
    Pkt.WriteBEInt16(a_SlotNum);
    WriteItem(Pkt, a_Item);
}





void cProtocol_1_9_0::SendKeepAlive(UInt32 a_PingID)
{
    // Drop the packet if the protocol is not in the Game state yet (caused a client crash):
    if (m_State != 3)
    {
        LOG("Trying to send a KeepAlive packet to a player who's not yet fully logged in (%d). The protocol class prevented the packet.", m_State);
        return;
    }

    cPacketizer Pkt(*this, pktKeepAlive);
    Pkt.WriteVarInt32(a_PingID);
}





void cProtocol_1_9_0::SendLeashEntity(const cEntity & a_Entity, const cEntity & a_EntityLeashedTo)
{
    ASSERT(m_State == 3);  // In game mode?
    cPacketizer Pkt(*this, pktLeashEntity);
    Pkt.WriteBEUInt32(a_Entity.GetUniqueID());
    Pkt.WriteBEUInt32(a_EntityLeashedTo.GetUniqueID());
}





void cProtocol_1_9_0::SendUnleashEntity(const cEntity & a_Entity)
{
    ASSERT(m_State == 3);  // In game mode?
    cPacketizer Pkt(*this, pktLeashEntity);
    Pkt.WriteBEUInt32(a_Entity.GetUniqueID());
    Pkt.WriteBEInt32(-1);  // Unleash a_Entity
}





void cProtocol_1_9_0::SendLogin(const cPlayer & a_Player, const cWorld & a_World)
{
    // Send the Join Game packet:
    {
        cServer * Server = cRoot::Get()->GetServer();
        cPacketizer Pkt(*this, pktJoinGame);
        Pkt.WriteBEUInt32(a_Player.GetUniqueID());
        Pkt.WriteBEUInt8(static_cast<UInt8>(a_Player.GetEffectiveGameMode()) | (Server->IsHardcore() ? 0x08 : 0));  // Hardcore flag bit 4
        Pkt.WriteBEInt8(static_cast<Int8>(a_World.GetDimension()));
        Pkt.WriteBEUInt8(2);  // TODO: Difficulty (set to Normal)
        Pkt.WriteBEUInt8(static_cast<UInt8>(Clamp<size_t>(Server->GetMaxPlayers(), 0, 255)));
        Pkt.WriteString("default");  // Level type - wtf?
        Pkt.WriteBool(false);  // Reduced Debug Info - wtf?
    }

    // Send the spawn position:
    {
        cPacketizer Pkt(*this, pktSpawnPosition);
        Pkt.WritePosition64(FloorC(a_World.GetSpawnX()), FloorC(a_World.GetSpawnY()), FloorC(a_World.GetSpawnZ()));
    }

    // Send the server difficulty:
    {
        cPacketizer Pkt(*this, pktDifficulty);
        Pkt.WriteBEInt8(1);
    }

    // Send player abilities:
    SendPlayerAbilities();
}





void cProtocol_1_9_0::SendLoginSuccess(void)
{
    ASSERT(m_State == 2);  // State: login?

    // Enable compression:
    {
        cPacketizer Pkt(*this, pktStartCompression);
        Pkt.WriteVarInt32(256);
    }

    m_State = 3;  // State = Game

    {
        cPacketizer Pkt(*this, pktLoginSuccess);
        Pkt.WriteString(m_Client->GetUUID().ToLongString());
        Pkt.WriteString(m_Client->GetUsername());
    }
}





void cProtocol_1_9_0::SendPaintingSpawn(const cPainting & a_Painting)
{
    ASSERT(m_State == 3);  // In game mode?
    double PosX = a_Painting.GetPosX();
    double PosY = a_Painting.GetPosY();
    double PosZ = a_Painting.GetPosZ();

    cPacketizer Pkt(*this, pktSpawnPainting);
    Pkt.WriteVarInt32(a_Painting.GetUniqueID());
    // TODO: Bad way to write a UUID, and it's not a true UUID, but this is functional for now.
    Pkt.WriteBEUInt64(0);
    Pkt.WriteBEUInt64(a_Painting.GetUniqueID());
    Pkt.WriteString(a_Painting.GetName().c_str());
    Pkt.WritePosition64(static_cast<Int32>(PosX), static_cast<Int32>(PosY), static_cast<Int32>(PosZ));
    Pkt.WriteBEInt8(static_cast<Int8>(a_Painting.GetProtocolFacing()));
}





void cProtocol_1_9_0::SendMapData(const cMap & a_Map, int a_DataStartX, int a_DataStartY)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktMapData);
    Pkt.WriteVarInt32(a_Map.GetID());
    Pkt.WriteBEUInt8(static_cast<UInt8>(a_Map.GetScale()));

    Pkt.WriteBool(true);
    Pkt.WriteVarInt32(static_cast<UInt32>(a_Map.GetDecorators().size()));
    for (const auto & Decorator : a_Map.GetDecorators())
    {
        Pkt.WriteBEUInt8(static_cast<Byte>((static_cast<Int32>(Decorator.GetType()) << 4) | (Decorator.GetRot() & 0xF)));
        Pkt.WriteBEUInt8(static_cast<UInt8>(Decorator.GetPixelX()));
        Pkt.WriteBEUInt8(static_cast<UInt8>(Decorator.GetPixelZ()));
    }

    Pkt.WriteBEUInt8(128);
    Pkt.WriteBEUInt8(128);
    Pkt.WriteBEUInt8(static_cast<UInt8>(a_DataStartX));
    Pkt.WriteBEUInt8(static_cast<UInt8>(a_DataStartY));
    Pkt.WriteVarInt32(static_cast<UInt32>(a_Map.GetData().size()));
    for (auto itr = a_Map.GetData().cbegin(); itr != a_Map.GetData().cend(); ++itr)
    {
        Pkt.WriteBEUInt8(*itr);
    }
}





void cProtocol_1_9_0::SendPickupSpawn(const cPickup & a_Pickup)
{
    ASSERT(m_State == 3);  // In game mode?

    {  // TODO Use SendSpawnObject
        cPacketizer Pkt(*this, pktSpawnObject);
        Pkt.WriteVarInt32(a_Pickup.GetUniqueID());
        // TODO: Bad way to write a UUID, and it's not a true UUID, but this is functional for now.
        Pkt.WriteBEUInt64(0);
        Pkt.WriteBEUInt64(a_Pickup.GetUniqueID());
        Pkt.WriteBEUInt8(2);  // Type = Pickup
        Pkt.WriteBEDouble(a_Pickup.GetPosX());
        Pkt.WriteBEDouble(a_Pickup.GetPosY());
        Pkt.WriteBEDouble(a_Pickup.GetPosZ());
        Pkt.WriteByteAngle(a_Pickup.GetYaw());
        Pkt.WriteByteAngle(a_Pickup.GetPitch());
        Pkt.WriteBEInt32(0);  // No object data
        Pkt.WriteBEInt16(0);  // No velocity
        Pkt.WriteBEInt16(0);
        Pkt.WriteBEInt16(0);
    }

    SendEntityMetadata(a_Pickup);
}





void cProtocol_1_9_0::SendPlayerAbilities(void)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktPlayerAbilities);
    Byte Flags = 0;
    cPlayer * Player = m_Client->GetPlayer();
    if (Player->IsGameModeCreative())
    {
        Flags |= 0x01;
        Flags |= 0x08;  // Godmode, used for creative
    }
    if (Player->IsFlying())
    {
        Flags |= 0x02;
    }
    if (Player->CanFly())
    {
        Flags |= 0x04;
    }
    Pkt.WriteBEUInt8(Flags);
    Pkt.WriteBEFloat(static_cast<float>(0.05 * Player->GetFlyingMaxSpeed()));
    Pkt.WriteBEFloat(static_cast<float>(0.1 * Player->GetNormalMaxSpeed()));
}





void cProtocol_1_9_0::SendEntityAnimation(const cEntity & a_Entity, char a_Animation)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktEntityAnimation);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    Pkt.WriteBEInt8(a_Animation);
}





void cProtocol_1_9_0::SendParticleEffect(const AString & a_ParticleName, float a_SrcX, float a_SrcY, float a_SrcZ, float a_OffsetX, float a_OffsetY, float a_OffsetZ, float a_ParticleData, int a_ParticleAmount)
{
    ASSERT(m_State == 3);  // In game mode?
    int ParticleID = GetParticleID(a_ParticleName);

    cPacketizer Pkt(*this, pktParticleEffect);
    Pkt.WriteBEInt32(ParticleID);
    Pkt.WriteBool(false);
    Pkt.WriteBEFloat(a_SrcX);
    Pkt.WriteBEFloat(a_SrcY);
    Pkt.WriteBEFloat(a_SrcZ);
    Pkt.WriteBEFloat(a_OffsetX);
    Pkt.WriteBEFloat(a_OffsetY);
    Pkt.WriteBEFloat(a_OffsetZ);
    Pkt.WriteBEFloat(a_ParticleData);
    Pkt.WriteBEInt32(a_ParticleAmount);
}





void cProtocol_1_9_0::SendParticleEffect(const AString & a_ParticleName, Vector3f a_Src, Vector3f a_Offset, float a_ParticleData, int a_ParticleAmount, std::array<int, 2> a_Data)
{
    ASSERT(m_State == 3);  // In game mode?
    int ParticleID = GetParticleID(a_ParticleName);

    cPacketizer Pkt(*this, pktParticleEffect);
    Pkt.WriteBEInt32(ParticleID);
    Pkt.WriteBool(false);
    Pkt.WriteBEFloat(a_Src.x);
    Pkt.WriteBEFloat(a_Src.y);
    Pkt.WriteBEFloat(a_Src.z);
    Pkt.WriteBEFloat(a_Offset.x);
    Pkt.WriteBEFloat(a_Offset.y);
    Pkt.WriteBEFloat(a_Offset.z);
    Pkt.WriteBEFloat(a_ParticleData);
    Pkt.WriteBEInt32(a_ParticleAmount);
    switch (ParticleID)
    {
        // iconcrack
        case 36:
        {
            Pkt.WriteVarInt32(static_cast<UInt32>(a_Data[0]));
            Pkt.WriteVarInt32(static_cast<UInt32>(a_Data[1]));
            break;
        }
        // blockcrack
        // blockdust
        case 37:
        case 38:
        {
            Pkt.WriteVarInt32(static_cast<UInt32>(a_Data[0]));
            break;
        }
        default:
        {
            break;
        }
    }
}





void cProtocol_1_9_0::SendPlayerListAddPlayer(const cPlayer & a_Player)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktPlayerList);
    Pkt.WriteVarInt32(0);
    Pkt.WriteVarInt32(1);
    Pkt.WriteUUID(a_Player.GetUUID());
    Pkt.WriteString(a_Player.GetPlayerListName());

    const Json::Value & Properties = a_Player.GetClientHandle()->GetProperties();
    Pkt.WriteVarInt32(Properties.size());
    for (auto & Node : Properties)
    {
        Pkt.WriteString(Node.get("name", "").asString());
        Pkt.WriteString(Node.get("value", "").asString());
        AString Signature = Node.get("signature", "").asString();
        if (Signature.empty())
        {
            Pkt.WriteBool(false);
        }
        else
        {
            Pkt.WriteBool(true);
            Pkt.WriteString(Signature);
        }
    }

    Pkt.WriteVarInt32(static_cast<UInt32>(a_Player.GetEffectiveGameMode()));
    Pkt.WriteVarInt32(static_cast<UInt32>(a_Player.GetClientHandle()->GetPing()));
    Pkt.WriteBool(false);
}





void cProtocol_1_9_0::SendPlayerListRemovePlayer(const cPlayer & a_Player)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktPlayerList);
    Pkt.WriteVarInt32(4);
    Pkt.WriteVarInt32(1);
    Pkt.WriteUUID(a_Player.GetUUID());
}





void cProtocol_1_9_0::SendPlayerListUpdateGameMode(const cPlayer & a_Player)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktPlayerList);
    Pkt.WriteVarInt32(1);
    Pkt.WriteVarInt32(1);
    Pkt.WriteUUID(a_Player.GetUUID());
    Pkt.WriteVarInt32(static_cast<UInt32>(a_Player.GetEffectiveGameMode()));
}





void cProtocol_1_9_0::SendPlayerListUpdatePing(const cPlayer & a_Player)
{
    ASSERT(m_State == 3);  // In game mode?

    auto ClientHandle = a_Player.GetClientHandlePtr();
    if (ClientHandle != nullptr)
    {
        cPacketizer Pkt(*this, pktPlayerList);
        Pkt.WriteVarInt32(2);
        Pkt.WriteVarInt32(1);
        Pkt.WriteUUID(a_Player.GetUUID());
        Pkt.WriteVarInt32(static_cast<UInt32>(ClientHandle->GetPing()));
    }
}





void cProtocol_1_9_0::SendPlayerListUpdateDisplayName(const cPlayer & a_Player, const AString & a_CustomName)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktPlayerList);
    Pkt.WriteVarInt32(3);
    Pkt.WriteVarInt32(1);
    Pkt.WriteUUID(a_Player.GetUUID());

    if (a_CustomName.empty())
    {
        Pkt.WriteBool(false);
    }
    else
    {
        Pkt.WriteBool(true);
        Pkt.WriteString(Printf("{\"text\":\"%s\"}", a_CustomName.c_str()));
    }
}





void cProtocol_1_9_0::SendPlayerMaxSpeed(void)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktPlayerMaxSpeed);
    cPlayer * Player = m_Client->GetPlayer();
    Pkt.WriteVarInt32(Player->GetUniqueID());
    Pkt.WriteBEInt32(1);  // Count
    Pkt.WriteString("generic.movementSpeed");
    // The default game speed is 0.1, multiply that value by the relative speed:
    Pkt.WriteBEDouble(0.1 * Player->GetNormalMaxSpeed());
    if (Player->IsSprinting())
    {
        Pkt.WriteVarInt32(1);  // Modifier count
        Pkt.WriteBEUInt64(0x662a6b8dda3e4c1c);
        Pkt.WriteBEUInt64(0x881396ea6097278d);  // UUID of the modifier
        Pkt.WriteBEDouble(Player->GetSprintingMaxSpeed() - Player->GetNormalMaxSpeed());
        Pkt.WriteBEUInt8(2);
    }
    else
    {
        Pkt.WriteVarInt32(0);  // Modifier count
    }
}





void cProtocol_1_9_0::SendPlayerMoveLook(void)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktPlayerMoveLook);
    cPlayer * Player = m_Client->GetPlayer();
    Pkt.WriteBEDouble(Player->GetPosX());
    Pkt.WriteBEDouble(Player->GetPosY());
    Pkt.WriteBEDouble(Player->GetPosZ());
    Pkt.WriteBEFloat(static_cast<float>(Player->GetYaw()));
    Pkt.WriteBEFloat(static_cast<float>(Player->GetPitch()));
    Pkt.WriteBEUInt8(0);
    Pkt.WriteVarInt32(++m_OutstandingTeleportId);

    // This teleport ID hasn't been confirmed yet
    m_IsTeleportIdConfirmed = false;
}





void cProtocol_1_9_0::SendPlayerPosition(void)
{
    // There is no dedicated packet for this, send the whole thing:
    SendPlayerMoveLook();
}





void cProtocol_1_9_0::SendPlayerSpawn(const cPlayer & a_Player)
{
    // Called to spawn another player for the client
    cPacketizer Pkt(*this, pktSpawnOtherPlayer);
    Pkt.WriteVarInt32(a_Player.GetUniqueID());
    Pkt.WriteUUID(a_Player.GetUUID());
    Vector3d LastSentPos = a_Player.GetLastSentPos();
    Pkt.WriteBEDouble(LastSentPos.x);
    Pkt.WriteBEDouble(LastSentPos.y + 0.001);  // The "+ 0.001" is there because otherwise the player falls through the block they were standing on.
    Pkt.WriteBEDouble(LastSentPos.z);
    Pkt.WriteByteAngle(a_Player.GetYaw());
    Pkt.WriteByteAngle(a_Player.GetPitch());
    WriteEntityMetadata(Pkt, a_Player);
    Pkt.WriteBEUInt8(0xff);  // Metadata: end
}





void cProtocol_1_9_0::SendPluginMessage(const AString & a_Channel, const AString & a_Message)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktPluginMessage);
    Pkt.WriteString(a_Channel);
    Pkt.WriteBuf(a_Message.data(), a_Message.size());
}





void cProtocol_1_9_0::SendRemoveEntityEffect(const cEntity & a_Entity, int a_EffectID)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktRemoveEntityEffect);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    Pkt.WriteBEUInt8(static_cast<UInt8>(a_EffectID));
}





void cProtocol_1_9_0::SendResetTitle(void)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktTitle);
    Pkt.WriteVarInt32(4);  // Reset title
}





void cProtocol_1_9_0::SendRespawn(eDimension a_Dimension)
{
    cPacketizer Pkt(*this, pktRespawn);
    cPlayer * Player = m_Client->GetPlayer();
    Pkt.WriteBEInt32(static_cast<Int32>(a_Dimension));
    Pkt.WriteBEUInt8(2);  // TODO: Difficulty (set to Normal)
    Pkt.WriteBEUInt8(static_cast<Byte>(Player->GetEffectiveGameMode()));
    Pkt.WriteString("default");
}





void cProtocol_1_9_0::SendScoreboardObjective(const AString & a_Name, const AString & a_DisplayName, Byte a_Mode)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktScoreboardObjective);
    Pkt.WriteString(a_Name);
    Pkt.WriteBEUInt8(a_Mode);
    if ((a_Mode == 0) || (a_Mode == 2))
    {
        Pkt.WriteString(a_DisplayName);
        Pkt.WriteString("integer");
    }
}





void cProtocol_1_9_0::SendScoreUpdate(const AString & a_Objective, const AString & a_Player, cObjective::Score a_Score, Byte a_Mode)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktUpdateScore);
    Pkt.WriteString(a_Player);
    Pkt.WriteBEUInt8(a_Mode);
    Pkt.WriteString(a_Objective);

    if (a_Mode != 1)
    {
        Pkt.WriteVarInt32(static_cast<UInt32>(a_Score));
    }
}





void cProtocol_1_9_0::SendDisplayObjective(const AString & a_Objective, cScoreboard::eDisplaySlot a_Display)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktDisplayObjective);
    Pkt.WriteBEUInt8(static_cast<UInt8>(a_Display));
    Pkt.WriteString(a_Objective);
}





void cProtocol_1_9_0::SendSetSubTitle(const cCompositeChat & a_SubTitle)
{
    SendSetRawSubTitle(a_SubTitle.CreateJsonString(false));
}





void cProtocol_1_9_0::SendSetRawSubTitle(const AString & a_SubTitle)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktTitle);
    Pkt.WriteVarInt32(1);  // Set subtitle
    Pkt.WriteString(a_SubTitle);
}





void cProtocol_1_9_0::SendSetTitle(const cCompositeChat & a_Title)
{
    SendSetRawTitle(a_Title.CreateJsonString(false));
}





void cProtocol_1_9_0::SendSetRawTitle(const AString & a_Title)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktTitle);
    Pkt.WriteVarInt32(0);  // Set title
    Pkt.WriteString(a_Title);
}





void cProtocol_1_9_0::SendSoundEffect(const AString & a_SoundName, double a_X, double a_Y, double a_Z, float a_Volume, float a_Pitch)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktSoundEffect);
    Pkt.WriteString(a_SoundName);
    Pkt.WriteVarInt32(0);  // Master sound category (may want to be changed to a parameter later)
    Pkt.WriteBEInt32(static_cast<Int32>(a_X * 8.0));
    Pkt.WriteBEInt32(static_cast<Int32>(a_Y * 8.0));
    Pkt.WriteBEInt32(static_cast<Int32>(a_Z * 8.0));
    Pkt.WriteBEFloat(a_Volume);
    Pkt.WriteBEUInt8(static_cast<Byte>(a_Pitch * 63));
}





void cProtocol_1_9_0::SendSoundParticleEffect(const EffectID a_EffectID, int a_SrcX, int a_SrcY, int a_SrcZ, int a_Data)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktSoundParticleEffect);
    Pkt.WriteBEInt32(static_cast<int>(a_EffectID));
    Pkt.WritePosition64(a_SrcX, a_SrcY, a_SrcZ);
    Pkt.WriteBEInt32(a_Data);
    Pkt.WriteBool(false);
}





void cProtocol_1_9_0::SendSpawnFallingBlock(const cFallingBlock & a_FallingBlock)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktSpawnObject);
    Pkt.WriteVarInt32(a_FallingBlock.GetUniqueID());
    // TODO: Bad way to write a UUID, and it's not a true UUID, but this is functional for now.
    Pkt.WriteBEUInt64(0);
    Pkt.WriteBEUInt64(a_FallingBlock.GetUniqueID());
    Pkt.WriteBEUInt8(70);  // Falling block
    Vector3d LastSentPos = a_FallingBlock.GetLastSentPos();
    Pkt.WriteBEDouble(LastSentPos.x);
    Pkt.WriteBEDouble(LastSentPos.y);
    Pkt.WriteBEDouble(LastSentPos.z);
    Pkt.WriteByteAngle(a_FallingBlock.GetYaw());
    Pkt.WriteByteAngle(a_FallingBlock.GetPitch());
    Pkt.WriteBEInt32(static_cast<Int32>(a_FallingBlock.GetBlockType()) | (static_cast<Int32>(a_FallingBlock.GetBlockMeta()) << 12));
    Pkt.WriteBEInt16(static_cast<Int16>(a_FallingBlock.GetSpeedX() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_FallingBlock.GetSpeedY() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_FallingBlock.GetSpeedZ() * 400));
}





void cProtocol_1_9_0::SendSpawnMob(const cMonster & a_Mob)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktSpawnMob);
    Pkt.WriteVarInt32(a_Mob.GetUniqueID());
    // TODO: Bad way to write a UUID, and it's not a true UUID, but this is functional for now.
    Pkt.WriteBEUInt64(0);
    Pkt.WriteBEUInt64(a_Mob.GetUniqueID());
    Pkt.WriteBEUInt8(static_cast<Byte>(a_Mob.GetMobType()));
    Vector3d LastSentPos = a_Mob.GetLastSentPos();
    Pkt.WriteBEDouble(LastSentPos.x);
    Pkt.WriteBEDouble(LastSentPos.y);
    Pkt.WriteBEDouble(LastSentPos.z);
    Pkt.WriteByteAngle(a_Mob.GetPitch());
    Pkt.WriteByteAngle(a_Mob.GetHeadYaw());
    Pkt.WriteByteAngle(a_Mob.GetYaw());
    Pkt.WriteBEInt16(static_cast<Int16>(a_Mob.GetSpeedX() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_Mob.GetSpeedY() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_Mob.GetSpeedZ() * 400));
    WriteEntityMetadata(Pkt, a_Mob);
    Pkt.WriteBEUInt8(0xff);  // Metadata terminator
}





void cProtocol_1_9_0::SendSpawnObject(const cEntity & a_Entity, char a_ObjectType, int a_ObjectData, Byte a_Yaw, Byte a_Pitch)
{
    ASSERT(m_State == 3);  // In game mode?
    double PosX = a_Entity.GetPosX();
    double PosZ = a_Entity.GetPosZ();
    double Yaw = a_Entity.GetYaw();
    if (a_ObjectType == 71)
    {
        FixItemFramePositions(a_ObjectData, PosX, PosZ, Yaw);
    }

    cPacketizer Pkt(*this, pktSpawnObject);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    // TODO: Bad way to write a UUID, and it's not a true UUID, but this is functional for now.
    Pkt.WriteBEUInt64(0);
    Pkt.WriteBEUInt64(a_Entity.GetUniqueID());
    Pkt.WriteBEUInt8(static_cast<UInt8>(a_ObjectType));
    Pkt.WriteBEDouble(PosX);
    Pkt.WriteBEDouble(a_Entity.GetPosY());
    Pkt.WriteBEDouble(PosZ);
    Pkt.WriteByteAngle(a_Entity.GetPitch());
    Pkt.WriteByteAngle(Yaw);
    Pkt.WriteBEInt32(a_ObjectData);
    Pkt.WriteBEInt16(static_cast<Int16>(a_Entity.GetSpeedX() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_Entity.GetSpeedY() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_Entity.GetSpeedZ() * 400));
}





void cProtocol_1_9_0::SendSpawnVehicle(const cEntity & a_Vehicle, char a_VehicleType, char a_VehicleSubType)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktSpawnObject);
    Pkt.WriteVarInt32(a_Vehicle.GetUniqueID());
    // TODO: Bad way to write a UUID, and it's not a true UUID, but this is functional for now.
    Pkt.WriteBEUInt64(0);
    Pkt.WriteBEUInt64(a_Vehicle.GetUniqueID());
    Pkt.WriteBEUInt8(static_cast<UInt8>(a_VehicleType));
    Vector3d LastSentPos = a_Vehicle.GetLastSentPos();
    Pkt.WriteBEDouble(LastSentPos.x);
    Pkt.WriteBEDouble(LastSentPos.y);
    Pkt.WriteBEDouble(LastSentPos.z);
    Pkt.WriteByteAngle(a_Vehicle.GetPitch());
    Pkt.WriteByteAngle(a_Vehicle.GetYaw());
    Pkt.WriteBEInt32(a_VehicleSubType);
    Pkt.WriteBEInt16(static_cast<Int16>(a_Vehicle.GetSpeedX() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_Vehicle.GetSpeedY() * 400));
    Pkt.WriteBEInt16(static_cast<Int16>(a_Vehicle.GetSpeedZ() * 400));
}





void cProtocol_1_9_0::SendStatistics(const cStatManager & a_Manager)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktStatistics);
    Pkt.WriteVarInt32(statCount);  // TODO 2014-05-11 xdot: Optimization: Send "dirty" statistics only

    size_t Count = static_cast<size_t>(statCount);
    for (size_t i = 0; i < Count; ++i)
    {
        StatValue Value = a_Manager.GetValue(static_cast<eStatistic>(i));
        const AString & StatName = cStatInfo::GetName(static_cast<eStatistic>(i));

        Pkt.WriteString(StatName);
        Pkt.WriteVarInt32(static_cast<UInt32>(Value));
    }
}





void cProtocol_1_9_0::SendTabCompletionResults(const AStringVector & a_Results)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktTabCompletionResults);
    Pkt.WriteVarInt32(static_cast<UInt32>(a_Results.size()));

    for (AStringVector::const_iterator itr = a_Results.begin(), end = a_Results.end(); itr != end; ++itr)
    {
        Pkt.WriteString(*itr);
    }
}





void cProtocol_1_9_0::SendTeleportEntity(const cEntity & a_Entity)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktTeleportEntity);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    Pkt.WriteBEDouble(a_Entity.GetPosX());
    Pkt.WriteBEDouble(a_Entity.GetPosY());
    Pkt.WriteBEDouble(a_Entity.GetPosZ());
    Pkt.WriteByteAngle(a_Entity.GetYaw());
    Pkt.WriteByteAngle(a_Entity.GetPitch());
    Pkt.WriteBool(a_Entity.IsOnGround());
}





void cProtocol_1_9_0::SendThunderbolt(int a_BlockX, int a_BlockY, int a_BlockZ)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktSpawnGlobalEntity);
    Pkt.WriteVarInt32(0);  // EntityID = 0, always
    Pkt.WriteBEUInt8(1);  // Type = Thunderbolt
    Pkt.WriteBEDouble(a_BlockX);
    Pkt.WriteBEDouble(a_BlockY);
    Pkt.WriteBEDouble(a_BlockZ);
}





void cProtocol_1_9_0::SendTitleTimes(int a_FadeInTicks, int a_DisplayTicks, int a_FadeOutTicks)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktTitle);
    Pkt.WriteVarInt32(2);  // Set title display times
    Pkt.WriteBEInt32(a_FadeInTicks);
    Pkt.WriteBEInt32(a_DisplayTicks);
    Pkt.WriteBEInt32(a_FadeOutTicks);
}





void cProtocol_1_9_0::SendTimeUpdate(Int64 a_WorldAge, Int64 a_TimeOfDay, bool a_DoDaylightCycle)
{
    ASSERT(m_State == 3);  // In game mode?
    if (!a_DoDaylightCycle)
    {
        // When writing a "-" before the number the client ignores it but it will stop the client-side time expiration.
        a_TimeOfDay = std::min(-a_TimeOfDay, -1LL);
    }

    cPacketizer Pkt(*this, pktTimeUpdate);
    Pkt.WriteBEInt64(a_WorldAge);
    Pkt.WriteBEInt64(a_TimeOfDay);
}





void cProtocol_1_9_0::SendUnloadChunk(int a_ChunkX, int a_ChunkZ)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktUnloadChunk);
    Pkt.WriteBEInt32(a_ChunkX);
    Pkt.WriteBEInt32(a_ChunkZ);
}





void cProtocol_1_9_0::SendUpdateBlockEntity(cBlockEntity & a_BlockEntity)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktUpdateBlockEntity);
    Pkt.WritePosition64(a_BlockEntity.GetPosX(), a_BlockEntity.GetPosY(), a_BlockEntity.GetPosZ());
    Byte Action = 0;
    switch (a_BlockEntity.GetBlockType())
    {
        case E_BLOCK_MOB_SPAWNER:   Action = 1; break;  // Update mob spawner spinny mob thing
        case E_BLOCK_COMMAND_BLOCK: Action = 2; break;  // Update command block text
        case E_BLOCK_BEACON:        Action = 3; break;  // Update beacon entity
        case E_BLOCK_HEAD:          Action = 4; break;  // Update Mobhead entity
        case E_BLOCK_FLOWER_POT:    Action = 5; break;  // Update flower pot
        case E_BLOCK_BED:           Action = 11; break;  // Update bed color
        default: ASSERT(!"Unhandled or unimplemented BlockEntity update request!"); break;
    }
    Pkt.WriteBEUInt8(Action);

    WriteBlockEntity(Pkt, a_BlockEntity);
}





void cProtocol_1_9_0::SendUpdateSign(int a_BlockX, int a_BlockY, int a_BlockZ, const AString & a_Line1, const AString & a_Line2, const AString & a_Line3, const AString & a_Line4)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktUpdateSign);
    Pkt.WritePosition64(a_BlockX, a_BlockY, a_BlockZ);

    Json::StyledWriter JsonWriter;
    AString Lines[] = { a_Line1, a_Line2, a_Line3, a_Line4 };
    for (size_t i = 0; i < ARRAYCOUNT(Lines); i++)
    {
        Json::Value RootValue;
        RootValue["text"] = Lines[i];
        Pkt.WriteString(JsonWriter.write(RootValue).c_str());
    }
}





void cProtocol_1_9_0::SendUseBed(const cEntity & a_Entity, int a_BlockX, int a_BlockY, int a_BlockZ)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktUseBed);
    Pkt.WriteVarInt32(a_Entity.GetUniqueID());
    Pkt.WritePosition64(a_BlockX, a_BlockY, a_BlockZ);
}





void cProtocol_1_9_0::SendWeather(eWeather a_Weather)
{
    ASSERT(m_State == 3);  // In game mode?

    {
        cPacketizer Pkt(*this, pktWeather);
        Pkt.WriteBEUInt8((a_Weather == wSunny) ? 1 : 2);  // End rain / begin rain
        Pkt.WriteBEFloat(0);  // Unused for weather
    }

    // TODO: Fade effect, somehow
}





void cProtocol_1_9_0::SendWholeInventory(const cWindow & a_Window)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktWindowItems);
    Pkt.WriteBEInt8(a_Window.GetWindowID());
    Pkt.WriteBEInt16(static_cast<Int16>(a_Window.GetNumSlots()));
    cItems Slots;
    a_Window.GetSlots(*(m_Client->GetPlayer()), Slots);
    for (cItems::const_iterator itr = Slots.begin(), end = Slots.end(); itr != end; ++itr)
    {
        WriteItem(Pkt, *itr);
    }  // for itr - Slots[]
}





void cProtocol_1_9_0::SendWindowClose(const cWindow & a_Window)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktWindowClose);
    Pkt.WriteBEInt8(a_Window.GetWindowID());
}





void cProtocol_1_9_0::SendWindowOpen(const cWindow & a_Window)
{
    ASSERT(m_State == 3);  // In game mode?

    if (a_Window.GetWindowType() < 0)
    {
        // Do not send this packet for player inventory windows
        return;
    }

    cPacketizer Pkt(*this, pktWindowOpen);
    Pkt.WriteBEInt8(a_Window.GetWindowID());
    Pkt.WriteString(a_Window.GetWindowTypeName());
    Pkt.WriteString(Printf("{\"text\":\"%s\"}", a_Window.GetWindowTitle().c_str()));

    switch (a_Window.GetWindowType())
    {
        case cWindow::wtWorkbench:
        case cWindow::wtEnchantment:
        case cWindow::wtAnvil:
        {
            Pkt.WriteBEInt8(0);
            break;
        }
        default:
        {
            Pkt.WriteBEInt8(static_cast<Int8>(a_Window.GetNumNonInventorySlots()));
            break;
        }
    }

    if (a_Window.GetWindowType() == cWindow::wtAnimalChest)
    {
        UInt32 HorseID = static_cast<const cHorseWindow &>(a_Window).GetHorseID();
        Pkt.WriteBEInt32(static_cast<Int32>(HorseID));
    }
}





void cProtocol_1_9_0::SendWindowProperty(const cWindow & a_Window, short a_Property, short a_Value)
{
    ASSERT(m_State == 3);  // In game mode?

    cPacketizer Pkt(*this, pktWindowProperty);
    Pkt.WriteBEInt8(a_Window.GetWindowID());
    Pkt.WriteBEInt16(a_Property);
    Pkt.WriteBEInt16(a_Value);
}





bool cProtocol_1_9_0::CompressPacket(const AString & a_Packet, AString & a_CompressedData)
{
    // Compress the data:
    char CompressedData[MAX_COMPRESSED_PACKET_LEN];

    uLongf CompressedSize = compressBound(static_cast<uLongf>(a_Packet.size()));
    if (CompressedSize >= MAX_COMPRESSED_PACKET_LEN)
    {
        ASSERT(!"Too high packet size.");
        return false;
    }

    int Status = compress2(
        reinterpret_cast<Bytef *>(CompressedData), &CompressedSize,
        reinterpret_cast<const Bytef *>(a_Packet.data()), static_cast<uLongf>(a_Packet.size()), Z_DEFAULT_COMPRESSION
    );
    if (Status != Z_OK)
    {
        return false;
    }

    AString LengthData;
    cByteBuffer Buffer(20);
    Buffer.WriteVarInt32(static_cast<UInt32>(a_Packet.size()));
    Buffer.ReadAll(LengthData);
    Buffer.CommitRead();

    Buffer.WriteVarInt32(static_cast<UInt32>(CompressedSize + LengthData.size()));
    Buffer.WriteVarInt32(static_cast<UInt32>(a_Packet.size()));
    Buffer.ReadAll(LengthData);
    Buffer.CommitRead();

    a_CompressedData.clear();
    a_CompressedData.reserve(LengthData.size() + CompressedSize);
    a_CompressedData.append(LengthData.data(), LengthData.size());
    a_CompressedData.append(CompressedData, CompressedSize);
    return true;
}





int cProtocol_1_9_0::GetParticleID(const AString & a_ParticleName)
{
    static std::map<AString, int> ParticleMap;
    if (ParticleMap.empty())
    {
        // Initialize the ParticleMap:
        ParticleMap["explode"]          = 0;
        ParticleMap["largeexplode"]     = 1;
        ParticleMap["hugeexplosion"]    = 2;
        ParticleMap["fireworksspark"]   = 3;
        ParticleMap["bubble"]           = 4;
        ParticleMap["splash"]           = 5;
        ParticleMap["wake"]             = 6;
        ParticleMap["suspended"]        = 7;
        ParticleMap["depthsuspend"]     = 8;
        ParticleMap["crit"]             = 9;
        ParticleMap["magiccrit"]        = 10;
        ParticleMap["smoke"]            = 11;
        ParticleMap["largesmoke"]       = 12;
        ParticleMap["spell"]            = 13;
        ParticleMap["instantspell"]     = 14;
        ParticleMap["mobspell"]         = 15;
        ParticleMap["mobspellambient"]  = 16;
        ParticleMap["witchmagic"]       = 17;
        ParticleMap["dripwater"]        = 18;
        ParticleMap["driplava"]         = 19;
        ParticleMap["angryvillager"]    = 20;
        ParticleMap["happyvillager"]    = 21;
        ParticleMap["townaura"]         = 22;
        ParticleMap["note"]             = 23;
        ParticleMap["portal"]           = 24;
        ParticleMap["enchantmenttable"] = 25;
        ParticleMap["flame"]            = 26;
        ParticleMap["lava"]             = 27;
        ParticleMap["footstep"]         = 28;
        ParticleMap["cloud"]            = 29;
        ParticleMap["reddust"]          = 30;
        ParticleMap["snowballpoof"]     = 31;
        ParticleMap["snowshovel"]       = 32;
        ParticleMap["slime"]            = 33;
        ParticleMap["heart"]            = 34;
        ParticleMap["barrier"]          = 35;
        ParticleMap["iconcrack"]        = 36;
        ParticleMap["blockcrack"]       = 37;
        ParticleMap["blockdust"]        = 38;
        ParticleMap["droplet"]          = 39;
        ParticleMap["take"]             = 40;
        ParticleMap["mobappearance"]    = 41;
        ParticleMap["dragonbreath"]     = 42;
        ParticleMap["endrod"]           = 43;
        ParticleMap["damageindicator"]  = 44;
        ParticleMap["sweepattack"]      = 45;
        ParticleMap["fallingdust"]      = 46;
        ParticleMap["totem"]            = 47;
        ParticleMap["spit"]             = 48;
    }

    AString ParticleName = StrToLower(a_ParticleName);
    if (ParticleMap.find(ParticleName) == ParticleMap.end())
    {
        LOGWARNING("Unknown particle: %s", a_ParticleName.c_str());
        ASSERT(!"Unknown particle");
        return 0;
    }

    return ParticleMap[ParticleName];
}





void cProtocol_1_9_0::FixItemFramePositions(int a_ObjectData, double & a_PosX, double & a_PosZ, double & a_Yaw)
{
    switch (a_ObjectData)
    {
        case 0:
        {
            a_PosZ += 1;
            a_Yaw = 0;
            break;
        }
        case 1:
        {
            a_PosX -= 1;
            a_Yaw = 90;
            break;
        }
        case 2:
        {
            a_PosZ -= 1;
            a_Yaw = 180;
            break;
        }
        case 3:
        {
            a_PosX += 1;
            a_Yaw = 270;
            break;
        }
    }
}





void cProtocol_1_9_0::AddReceivedData(const char * a_Data, size_t a_Size)
{
    // Write the incoming data into the comm log file:
    if (g_ShouldLogCommIn && m_CommLogFile.IsOpen())
    {
        if (m_ReceivedData.GetReadableSpace() > 0)
        {
            AString AllData;
            size_t OldReadableSpace = m_ReceivedData.GetReadableSpace();
            m_ReceivedData.ReadAll(AllData);
            m_ReceivedData.ResetRead();
            m_ReceivedData.SkipRead(m_ReceivedData.GetReadableSpace() - OldReadableSpace);
            ASSERT(m_ReceivedData.GetReadableSpace() == OldReadableSpace);
            AString Hex;
            CreateHexDump(Hex, AllData.data(), AllData.size(), 16);
            m_CommLogFile.Printf("Incoming data, %zu (0x%zx) unparsed bytes already present in buffer:\n%s\n",
                AllData.size(), AllData.size(), Hex.c_str()
            );
        }
        AString Hex;
        CreateHexDump(Hex, a_Data, a_Size, 16);
        m_CommLogFile.Printf("Incoming data: %u (0x%x) bytes: \n%s\n",
            static_cast<unsigned>(a_Size), static_cast<unsigned>(a_Size), Hex.c_str()
        );
        m_CommLogFile.Flush();
    }

    if (!m_ReceivedData.Write(a_Data, a_Size))
    {
        // Too much data in the incoming queue, report to caller:
        m_Client->PacketBufferFull();
        return;
    }

    // Handle all complete packets:
    for (;;)
    {
        UInt32 PacketLen;
        if (!m_ReceivedData.ReadVarInt(PacketLen))
        {
            // Not enough data
            m_ReceivedData.ResetRead();
            break;
        }
        if (!m_ReceivedData.CanReadBytes(PacketLen))
        {
            // The full packet hasn't been received yet
            m_ReceivedData.ResetRead();
            break;
        }

        // Check packet for compression:
        UInt32 UncompressedSize = 0;
        AString UncompressedData;
        if (m_State == 3)
        {
            UInt32 NumBytesRead = static_cast<UInt32>(m_ReceivedData.GetReadableSpace());

            if (!m_ReceivedData.ReadVarInt(UncompressedSize))
            {
                m_Client->Kick("Compression packet incomplete");
                return;
            }

            NumBytesRead -= static_cast<UInt32>(m_ReceivedData.GetReadableSpace());  // How many bytes has the UncompressedSize taken up?
            ASSERT(PacketLen > NumBytesRead);
            PacketLen -= NumBytesRead;

            if (UncompressedSize > 0)
            {
                // Decompress the data:
                AString CompressedData;
                VERIFY(m_ReceivedData.ReadString(CompressedData, PacketLen));
                if (InflateString(CompressedData.data(), PacketLen, UncompressedData) != Z_OK)
                {
                    m_Client->Kick("Compression failure");
                    return;
                }
                PacketLen = static_cast<UInt32>(UncompressedData.size());
                if (PacketLen != UncompressedSize)
                {
                    m_Client->Kick("Wrong uncompressed packet size given");
                    return;
                }
            }
        }

        // Move the packet payload to a separate cByteBuffer, bb:
        cByteBuffer bb(PacketLen + 1);
        if (UncompressedSize == 0)
        {
            // No compression was used, move directly
            VERIFY(m_ReceivedData.ReadToByteBuffer(bb, static_cast<size_t>(PacketLen)));
        }
        else
        {
            // Compression was used, move the uncompressed data:
            VERIFY(bb.Write(UncompressedData.data(), UncompressedData.size()));
        }
        m_ReceivedData.CommitRead();

        UInt32 PacketType;
        if (!bb.ReadVarInt(PacketType))
        {
            // Not enough data
            break;
        }

        // Write one NUL extra, so that we can detect over-reads
        bb.Write("\0", 1);

        // Log the packet info into the comm log file:
        if (g_ShouldLogCommIn && m_CommLogFile.IsOpen())
        {
            AString PacketData;
            bb.ReadAll(PacketData);
            bb.ResetRead();
            bb.ReadVarInt(PacketType);  // We have already read the packet type once, it will be there again
            ASSERT(PacketData.size() > 0);  // We have written an extra NUL, so there had to be at least one byte read
            PacketData.resize(PacketData.size() - 1);
            AString PacketDataHex;
            CreateHexDump(PacketDataHex, PacketData.data(), PacketData.size(), 16);
            m_CommLogFile.Printf("Next incoming packet is type %u (0x%x), length %u (0x%x) at state %d. Payload:\n%s\n",
                PacketType, PacketType, PacketLen, PacketLen, m_State, PacketDataHex.c_str()
            );
        }

        if (!HandlePacket(bb, PacketType))
        {
            // Unknown packet, already been reported, but without the length. Log the length here:
            LOGWARNING("Protocol 1.9: Unhandled packet: type 0x%x, state %d, length %u", PacketType, m_State, PacketLen);

            #ifdef _DEBUG
                // Dump the packet contents into the log:
                bb.ResetRead();
                AString Packet;
                bb.ReadAll(Packet);
                Packet.resize(Packet.size() - 1);  // Drop the final NUL pushed there for over-read detection
                AString Out;
                CreateHexDump(Out, Packet.data(), Packet.size(), 24);
                LOGD("Packet contents:\n%s", Out.c_str());
            #endif  // _DEBUG

            // Put a message in the comm log:
            if (g_ShouldLogCommIn && m_CommLogFile.IsOpen())
            {
                m_CommLogFile.Printf("^^^^^^ Unhandled packet ^^^^^^\n\n\n");
            }

            return;
        }

        // The packet should have 1 byte left in the buffer - the NUL we had added
        if (bb.GetReadableSpace() != 1)
        {
            // Read more or less than packet length, report as error
            LOGWARNING("Protocol 1.9: Wrong number of bytes read for packet 0x%x, state %d. Read %zu bytes, packet contained %u bytes",
                PacketType, m_State, bb.GetUsedSpace() - bb.GetReadableSpace(), PacketLen
            );

            // Put a message in the comm log:
            if (g_ShouldLogCommIn && m_CommLogFile.IsOpen())
            {
                m_CommLogFile.Printf("^^^^^^ Wrong number of bytes read for this packet (exp %d left, got %zu left) ^^^^^^\n\n\n",
                    1, bb.GetReadableSpace()
                );
                m_CommLogFile.Flush();
            }

            ASSERT(!"Read wrong number of bytes!");
            m_Client->PacketError(PacketType);
        }
    }  // for (ever)

    // Log any leftover bytes into the logfile:
    if (g_ShouldLogCommIn && (m_ReceivedData.GetReadableSpace() > 0) && m_CommLogFile.IsOpen())
    {
        AString AllData;
        size_t OldReadableSpace = m_ReceivedData.GetReadableSpace();
        m_ReceivedData.ReadAll(AllData);
        m_ReceivedData.ResetRead();
        m_ReceivedData.SkipRead(m_ReceivedData.GetReadableSpace() - OldReadableSpace);
        ASSERT(m_ReceivedData.GetReadableSpace() == OldReadableSpace);
        AString Hex;
        CreateHexDump(Hex, AllData.data(), AllData.size(), 16);
        m_CommLogFile.Printf("Protocol 1.9: There are %zu (0x%zx) bytes of non-parse-able data left in the buffer:\n%s",
            m_ReceivedData.GetReadableSpace(), m_ReceivedData.GetReadableSpace(), Hex.c_str()
        );
        m_CommLogFile.Flush();
    }
}





UInt32 cProtocol_1_9_0::GetPacketID(cProtocol::ePacketType a_Packet)
{
    switch (a_Packet)
    {
        case pktAttachEntity:          return 0x40;
        case pktBlockAction:           return 0x0a;
        case pktBlockBreakAnim:        return 0x08;
        case pktBlockChange:           return 0x0b;
        case pktBlockChanges:          return 0x10;
        case pktCameraSetTo:           return 0x36;
        case pktChatRaw:               return 0x0f;
        case pktCollectEntity:         return 0x49;
        case pktDestroyEntity:         return 0x30;
        case pktDifficulty:            return 0x0d;
        case pktDisconnectDuringGame:  return 0x1a;
        case pktDisconnectDuringLogin: return 0x0;
        case pktDisplayObjective:      return 0x38;
        case pktEditSign:              return 0x2a;
        case pktEncryptionRequest:     return 0x01;
        case pktEntityAnimation:       return 0x06;
        case pktEntityEffect:          return 0x4c;
        case pktEntityEquipment:       return 0x3c;
        case pktEntityHeadLook:        return 0x34;
        case pktEntityLook:            return 0x27;
        case pktEntityMeta:            return 0x39;
        case pktEntityProperties:      return 0x4b;
        case pktEntityRelMove:         return 0x25;
        case pktEntityRelMoveLook:     return 0x26;
        case pktEntityStatus:          return 0x1b;
        case pktEntityVelocity:        return 0x3b;
        case pktExperience:            return 0x3d;
        case pktExplosion:             return 0x1c;
        case pktGameMode:              return 0x1e;
        case pktHeldItemChange:        return 0x37;
        case pktInventorySlot:         return 0x16;
        case pktJoinGame:              return 0x23;
        case pktKeepAlive:             return 0x1f;
        case pktLeashEntity:           return 0x3a;
        case pktLoginSuccess:          return 0x02;
        case pktMapData:               return 0x24;
        case pktParticleEffect:        return 0x22;
        case pktPingResponse:          return 0x01;
        case pktPlayerAbilities:       return 0x2b;
        case pktPlayerList:            return 0x2d;
        case pktPlayerMaxSpeed:        return 0x4b;
        case pktPlayerMoveLook:        return 0x2e;
        case pktPluginMessage:         return 0x18;
        case pktRemoveEntityEffect:    return 0x31;
        case pktRespawn:               return 0x33;
        case pktScoreboardObjective:   return 0x3f;
        case pktSpawnExperienceOrb:    return 0x01;
        case pktSpawnGlobalEntity:     return 0x02;
        case pktSpawnObject:           return 0x00;
        case pktSpawnOtherPlayer:      return 0x05;
        case pktSpawnPainting:         return 0x04;
        case pktSpawnPosition:         return 0x43;
        case pktSoundEffect:           return 0x19;
        case pktSoundParticleEffect:   return 0x21;
        case pktSpawnMob:              return 0x03;
        case pktStartCompression:      return 0x03;
        case pktStatistics:            return 0x07;
        case pktStatusResponse:        return 0x00;
        case pktTabCompletionResults:  return 0x0e;
        case pktTeleportEntity:        return 0x4a;
        case pktTimeUpdate:            return 0x44;
        case pktTitle:                 return 0x45;
        case pktUnloadChunk:           return 0x1d;
        case pktUpdateBlockEntity:     return 0x09;
        case pktUpdateHealth:          return 0x3e;
        case pktUpdateScore:           return 0x42;
        case pktUpdateSign:            return 0x46;
        case pktUseBed:                return 0x2f;
        case pktWeather:               return 0x1e;
        case pktWindowClose:           return 0x12;
        case pktWindowItems:           return 0x14;
        case pktWindowOpen:            return 0x13;
        case pktWindowProperty:        return 0x15;
    }
    UNREACHABLE("Unsupported outgoing packet type");
}





bool cProtocol_1_9_0::HandlePacket(cByteBuffer & a_ByteBuffer, UInt32 a_PacketType)
{
    switch (m_State)
    {
        case 1:
        {
            // Status
            switch (a_PacketType)
            {
                case 0x00: HandlePacketStatusRequest(a_ByteBuffer); return true;
                case 0x01: HandlePacketStatusPing   (a_ByteBuffer); return true;
            }
            break;
        }

        case 2:
        {
            // Login
            switch (a_PacketType)
            {
                case 0x00: HandlePacketLoginStart             (a_ByteBuffer); return true;
                case 0x01: HandlePacketLoginEncryptionResponse(a_ByteBuffer); return true;
            }
            break;
        }

        case 3:
        {
            // Game
            switch (a_PacketType)
            {
                case 0x00: HandleConfirmTeleport              (a_ByteBuffer); return true;
                case 0x01: HandlePacketTabComplete            (a_ByteBuffer); return true;
                case 0x02: HandlePacketChatMessage            (a_ByteBuffer); return true;
                case 0x03: HandlePacketClientStatus           (a_ByteBuffer); return true;
                case 0x04: HandlePacketClientSettings         (a_ByteBuffer); return true;
                case 0x05: break;  // Confirm transaction - not used in MCS
                case 0x06: HandlePacketEnchantItem            (a_ByteBuffer); return true;
                case 0x07: HandlePacketWindowClick            (a_ByteBuffer); return true;
                case 0x08: HandlePacketWindowClose            (a_ByteBuffer); return true;
                case 0x09: HandlePacketPluginMessage          (a_ByteBuffer); return true;
                case 0x0a: HandlePacketUseEntity              (a_ByteBuffer); return true;
                case 0x0b: HandlePacketKeepAlive              (a_ByteBuffer); return true;
                case 0x0c: HandlePacketPlayerPos              (a_ByteBuffer); return true;
                case 0x0d: HandlePacketPlayerPosLook          (a_ByteBuffer); return true;
                case 0x0e: HandlePacketPlayerLook             (a_ByteBuffer); return true;
                case 0x0f: HandlePacketPlayer                 (a_ByteBuffer); return true;
                case 0x10: HandlePacketVehicleMove            (a_ByteBuffer); return true;
                case 0x11: HandlePacketBoatSteer              (a_ByteBuffer); return true;
                case 0x12: HandlePacketPlayerAbilities        (a_ByteBuffer); return true;
                case 0x13: HandlePacketBlockDig               (a_ByteBuffer); return true;
                case 0x14: HandlePacketEntityAction           (a_ByteBuffer); return true;
                case 0x15: HandlePacketSteerVehicle           (a_ByteBuffer); return true;
                case 0x16: break;  // Resource pack status - not yet implemented
                case 0x17: HandlePacketSlotSelect             (a_ByteBuffer); return true;
                case 0x18: HandlePacketCreativeInventoryAction(a_ByteBuffer); return true;
                case 0x19: HandlePacketUpdateSign             (a_ByteBuffer); return true;
                case 0x1a: HandlePacketAnimation              (a_ByteBuffer); return true;
                case 0x1b: HandlePacketSpectate               (a_ByteBuffer); return true;
                case 0x1c: HandlePacketBlockPlace             (a_ByteBuffer); return true;
                case 0x1d: HandlePacketUseItem                (a_ByteBuffer); return true;
            }
            break;
        }
        default:
        {
            // Received a packet in an unknown state, report:
            LOGWARNING("Received a packet in an unknown protocol state %d. Ignoring further packets.", m_State);

            // Cannot kick the client - we don't know this state and thus the packet number for the kick packet

            // Switch to a state when all further packets are silently ignored:
            m_State = 255;
            return false;
        }
        case 255:
        {
            // This is the state used for "not processing packets anymore" when we receive a bad packet from a client.
            // Do not output anything (the caller will do that for us), just return failure
            return false;
        }
    }  // switch (m_State)

    // Unknown packet type, report to the ClientHandle:
    m_Client->PacketUnknown(a_PacketType);
    return false;
}





void cProtocol_1_9_0::HandlePacketStatusPing(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEInt64, Int64, Timestamp);

    cPacketizer Pkt(*this, pktPingResponse);
    Pkt.WriteBEInt64(Timestamp);
}





void cProtocol_1_9_0::HandlePacketStatusRequest(cByteBuffer & a_ByteBuffer)
{
    cServer * Server = cRoot::Get()->GetServer();
    AString ServerDescription = Server->GetDescription();
    auto NumPlayers = static_cast<signed>(Server->GetNumPlayers());
    auto MaxPlayers = static_cast<signed>(Server->GetMaxPlayers());
    AString Favicon = Server->GetFaviconData();
    cRoot::Get()->GetPluginManager()->CallHookServerPing(*m_Client, ServerDescription, NumPlayers, MaxPlayers, Favicon);

    // Version:
    Json::Value Version;
    Version["name"] = "Cuberite 1.9";
    Version["protocol"] = 107;

    // Players:
    Json::Value Players;
    Players["online"] = NumPlayers;
    Players["max"] = MaxPlayers;
    // TODO: Add "sample"

    // Description:
    Json::Value Description;
    Description["text"] = ServerDescription.c_str();

    // Create the response:
    Json::Value ResponseValue;
    ResponseValue["version"] = Version;
    ResponseValue["players"] = Players;
    ResponseValue["description"] = Description;
    m_Client->ForgeAugmentServerListPing(ResponseValue);
    if (!Favicon.empty())
    {
        ResponseValue["favicon"] = Printf("data:image/png;base64,%s", Favicon.c_str());
    }

    Json::FastWriter Writer;
    AString Response = Writer.write(ResponseValue);

    cPacketizer Pkt(*this, pktStatusResponse);
    Pkt.WriteString(Response);
}





void cProtocol_1_9_0::HandlePacketLoginEncryptionResponse(cByteBuffer & a_ByteBuffer)
{
    UInt32 EncKeyLength, EncNonceLength;
    if (!a_ByteBuffer.ReadVarInt(EncKeyLength))
    {
        return;
    }
    AString EncKey;
    if (!a_ByteBuffer.ReadString(EncKey, EncKeyLength))
    {
        return;
    }
    if (!a_ByteBuffer.ReadVarInt(EncNonceLength))
    {
        return;
    }
    AString EncNonce;
    if (!a_ByteBuffer.ReadString(EncNonce, EncNonceLength))
    {
        return;
    }
    if ((EncKeyLength > MAX_ENC_LEN) || (EncNonceLength > MAX_ENC_LEN))
    {
        LOGD("Too long encryption");
        m_Client->Kick("Hacked client");
        return;
    }

    // Decrypt EncNonce using privkey
    cRsaPrivateKey & rsaDecryptor = cRoot::Get()->GetServer()->GetPrivateKey();
    UInt32 DecryptedNonce[MAX_ENC_LEN / sizeof(Int32)];
    int res = rsaDecryptor.Decrypt(reinterpret_cast<const Byte *>(EncNonce.data()), EncNonce.size(), reinterpret_cast<Byte *>(DecryptedNonce), sizeof(DecryptedNonce));
    if (res != 4)
    {
        LOGD("Bad nonce length: got %d, exp %d", res, 4);
        m_Client->Kick("Hacked client");
        return;
    }
    if (ntohl(DecryptedNonce[0]) != static_cast<unsigned>(reinterpret_cast<uintptr_t>(this)))
    {
        LOGD("Bad nonce value");
        m_Client->Kick("Hacked client");
        return;
    }

    // Decrypt the symmetric encryption key using privkey:
    Byte DecryptedKey[MAX_ENC_LEN];
    res = rsaDecryptor.Decrypt(reinterpret_cast<const Byte *>(EncKey.data()), EncKey.size(), DecryptedKey, sizeof(DecryptedKey));
    if (res != 16)
    {
        LOGD("Bad key length");
        m_Client->Kick("Hacked client");
        return;
    }

    StartEncryption(DecryptedKey);
    m_Client->HandleLogin(m_Client->GetUsername());
}





void cProtocol_1_9_0::HandlePacketLoginStart(cByteBuffer & a_ByteBuffer)
{
    AString Username;
    if (!a_ByteBuffer.ReadVarUTF8String(Username))
    {
        m_Client->Kick("Bad username");
        return;
    }

    if (!m_Client->HandleHandshake(Username))
    {
        // The client is not welcome here, they have been sent a Kick packet already
        return;
    }

    cServer * Server = cRoot::Get()->GetServer();
    // If auth is required, then send the encryption request:
    if (Server->ShouldAuthenticate())
    {
        cPacketizer Pkt(*this, pktEncryptionRequest);
        Pkt.WriteString(Server->GetServerID());
        const AString & PubKeyDer = Server->GetPublicKeyDER();
        Pkt.WriteVarInt32(static_cast<UInt32>(PubKeyDer.size()));
        Pkt.WriteBuf(PubKeyDer.data(), PubKeyDer.size());
        Pkt.WriteVarInt32(4);
        Pkt.WriteBEInt32(static_cast<int>(reinterpret_cast<intptr_t>(this)));  // Using 'this' as the cryptographic nonce, so that we don't have to generate one each time :)
        m_Client->SetUsername(Username);
        return;
    }

    m_Client->HandleLogin(Username);
}





void cProtocol_1_9_0::HandlePacketAnimation(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarInt, Int32, Hand);

    m_Client->HandleAnimation(0);  // Packet exists solely for arm-swing notification
}





void cProtocol_1_9_0::HandlePacketBlockDig(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, Status);

    int BlockX, BlockY, BlockZ;
    if (!a_ByteBuffer.ReadPosition64(BlockX, BlockY, BlockZ))
    {
        return;
    }

    HANDLE_READ(a_ByteBuffer, ReadVarInt, Int32, Face);
    m_Client->HandleLeftClick(BlockX, BlockY, BlockZ, FaceIntToBlockFace(Face), Status);
}





void cProtocol_1_9_0::HandlePacketBlockPlace(cByteBuffer & a_ByteBuffer)
{
    int BlockX, BlockY, BlockZ;
    if (!a_ByteBuffer.ReadPosition64(BlockX, BlockY, BlockZ))
    {
        return;
    }

    HANDLE_READ(a_ByteBuffer, ReadVarInt, Int32, Face);
    HANDLE_READ(a_ByteBuffer, ReadVarInt, Int32, Hand);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, CursorX);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, CursorY);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, CursorZ);
    m_Client->HandleRightClick(BlockX, BlockY, BlockZ, FaceIntToBlockFace(Face), CursorX, CursorY, CursorZ, HandIntToEnum(Hand));
}





void cProtocol_1_9_0::HandlePacketBoatSteer(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBool, bool, RightPaddle);
    HANDLE_READ(a_ByteBuffer, ReadBool, bool, LeftPaddle);

    // Get the players vehicle
    cPlayer * Player = m_Client->GetPlayer();
    cEntity * Vehicle = Player->GetAttached();

    if (Vehicle)
    {
        if (Vehicle->GetEntityType() == cEntity::etBoat)
        {
            auto * Boat = static_cast<cBoat *>(Vehicle);
            Boat->UpdatePaddles(RightPaddle, LeftPaddle);
        }
    }
}





void cProtocol_1_9_0::HandlePacketChatMessage(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Message);
    m_Client->HandleChat(Message);
}





void cProtocol_1_9_0::HandlePacketClientSettings(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Locale);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8,       UInt8,   ViewDistance);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8,       UInt8,   ChatFlags);
    HANDLE_READ(a_ByteBuffer, ReadBool,          bool,    ChatColors);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8,       UInt8,   SkinParts);
    HANDLE_READ(a_ByteBuffer, ReadVarInt,        UInt32,   MainHand);

    m_Client->SetLocale(Locale);
    m_Client->SetViewDistance(ViewDistance);
    m_Client->GetPlayer()->SetSkinParts(SkinParts);
    m_Client->GetPlayer()->SetMainHand(static_cast<eMainHand>(MainHand));
    // TODO: Handle chat flags and chat colors
}





void cProtocol_1_9_0::HandlePacketClientStatus(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, ActionID);
    switch (ActionID)
    {
        case 0:
        {
            // Respawn
            m_Client->HandleRespawn();
            break;
        }
        case 1:
        {
            // Request stats
            const cStatManager & Manager = m_Client->GetPlayer()->GetStatManager();
            SendStatistics(Manager);

            break;
        }
        case 2:
        {
            // Open Inventory achievement
            m_Client->GetPlayer()->AwardAchievement(achOpenInv);
            break;
        }
    }
}





void cProtocol_1_9_0::HandleConfirmTeleport(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarInt32, UInt32, TeleportID);

    // Can we stop throwing away incoming player position packets?
    if (TeleportID == m_OutstandingTeleportId)
    {
        m_IsTeleportIdConfirmed = true;
    }
}





void cProtocol_1_9_0::HandlePacketCreativeInventoryAction(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEInt16, Int16, SlotNum);
    cItem Item;
    if (!ReadItem(a_ByteBuffer, Item))
    {
        return;
    }
    m_Client->HandleCreativeInventory(SlotNum, Item, (SlotNum == -1) ? caLeftClickOutside : caLeftClick);
}





void cProtocol_1_9_0::HandlePacketEntityAction(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarInt,  UInt32, PlayerID);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8,  Action);
    HANDLE_READ(a_ByteBuffer, ReadVarInt,  UInt32, JumpBoost);

    switch (Action)
    {
        case 0: m_Client->HandleEntityCrouch(PlayerID, true);     break;  // Crouch
        case 1: m_Client->HandleEntityCrouch(PlayerID, false);    break;  // Uncrouch
        case 2: m_Client->HandleEntityLeaveBed(PlayerID);         break;  // Leave Bed
        case 3: m_Client->HandleEntitySprinting(PlayerID, true);  break;  // Start sprinting
        case 4: m_Client->HandleEntitySprinting(PlayerID, false); break;  // Stop sprinting
        case 7: m_Client->HandleOpenHorseInventory(PlayerID);     break;  // Open horse inventory
    }
}





void cProtocol_1_9_0::HandlePacketKeepAlive(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarInt, UInt32, KeepAliveID);
    m_Client->HandleKeepAlive(KeepAliveID);
}





void cProtocol_1_9_0::HandlePacketPlayer(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBool, bool, IsOnGround);
    // TODO: m_Client->HandlePlayerOnGround(IsOnGround);
}





void cProtocol_1_9_0::HandlePacketPlayerAbilities(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, Flags);
    HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, FlyingSpeed);
    HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, WalkingSpeed);

    // COnvert the bitfield into individual boolean flags:
    bool IsFlying = false, CanFly = false;
    if ((Flags & 2) != 0)
    {
        IsFlying = true;
    }
    if ((Flags & 4) != 0)
    {
        CanFly = true;
    }

    m_Client->HandlePlayerAbilities(CanFly, IsFlying, FlyingSpeed, WalkingSpeed);
}





void cProtocol_1_9_0::HandlePacketPlayerLook(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, Yaw);
    HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, Pitch);
    HANDLE_READ(a_ByteBuffer, ReadBool,    bool,  IsOnGround);
    m_Client->HandlePlayerLook(Yaw, Pitch, IsOnGround);
}





void cProtocol_1_9_0::HandlePacketPlayerPos(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEDouble, double, PosX);
    HANDLE_READ(a_ByteBuffer, ReadBEDouble, double, PosY);
    HANDLE_READ(a_ByteBuffer, ReadBEDouble, double, PosZ);
    HANDLE_READ(a_ByteBuffer, ReadBool,     bool,   IsOnGround);

    if (m_IsTeleportIdConfirmed)
    {
        m_Client->HandlePlayerPos(PosX, PosY, PosZ, PosY + (m_Client->GetPlayer()->IsCrouched() ? 1.54 : 1.62), IsOnGround);
    }
}





void cProtocol_1_9_0::HandlePacketPlayerPosLook(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEDouble, double, PosX);
    HANDLE_READ(a_ByteBuffer, ReadBEDouble, double, PosY);
    HANDLE_READ(a_ByteBuffer, ReadBEDouble, double, PosZ);
    HANDLE_READ(a_ByteBuffer, ReadBEFloat,  float,  Yaw);
    HANDLE_READ(a_ByteBuffer, ReadBEFloat,  float,  Pitch);
    HANDLE_READ(a_ByteBuffer, ReadBool,     bool,   IsOnGround);

    if (m_IsTeleportIdConfirmed)
    {
        m_Client->HandlePlayerMoveLook(PosX, PosY, PosZ, PosY + 1.62, Yaw, Pitch, IsOnGround);
    }
}





void cProtocol_1_9_0::HandlePacketPluginMessage(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Channel);

    // If the plugin channel is recognized vanilla, handle it directly:
    if (Channel.substr(0, 3) == "MC|")
    {
        HandleVanillaPluginMessage(a_ByteBuffer, Channel);

        // Skip any unread data (vanilla sometimes sends garbage at the end of a packet; #1692):
        if (a_ByteBuffer.GetReadableSpace() > 1)
        {
            LOGD("Protocol 1.8: Skipping garbage data at the end of a vanilla PluginMessage packet, %u bytes",
                static_cast<unsigned>(a_ByteBuffer.GetReadableSpace() - 1)
            );
            a_ByteBuffer.SkipRead(a_ByteBuffer.GetReadableSpace() - 1);
        }

        return;
    }

    // Read the plugin message and relay to clienthandle:
    AString Data;
    VERIFY(a_ByteBuffer.ReadString(Data, a_ByteBuffer.GetReadableSpace() - 1));  // Always succeeds
    m_Client->HandlePluginMessage(Channel, Data);
}





void cProtocol_1_9_0::HandlePacketSlotSelect(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEInt16, Int16, SlotNum);
    m_Client->HandleSlotSelected(SlotNum);
}





void cProtocol_1_9_0::HandlePacketSpectate(cByteBuffer & a_ByteBuffer)
{
    cUUID playerUUID;
    if (!a_ByteBuffer.ReadUUID(playerUUID))
    {
        return;
    }

    m_Client->HandleSpectate(playerUUID);
}





void cProtocol_1_9_0::HandlePacketSteerVehicle(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, Sideways);
    HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, Forward);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, Flags);

    if ((Flags & 0x2) != 0)
    {
        m_Client->HandleUnmount();
    }
    else if ((Flags & 0x1) != 0)
    {
        // TODO: Handle vehicle jump (for animals)
    }
    else
    {
        m_Client->HandleSteerVehicle(Forward, Sideways);
    }
}





void cProtocol_1_9_0::HandlePacketTabComplete(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Text);
    HANDLE_READ(a_ByteBuffer, ReadBool,          bool,    AssumeCommand);
    HANDLE_READ(a_ByteBuffer, ReadBool,          bool,    HasPosition);

    if (HasPosition)
    {
        HANDLE_READ(a_ByteBuffer, ReadBEInt64, Int64, Position);
    }

    m_Client->HandleTabCompletion(Text);
}





void cProtocol_1_9_0::HandlePacketUpdateSign(cByteBuffer & a_ByteBuffer)
{
    int BlockX, BlockY, BlockZ;
    if (!a_ByteBuffer.ReadPosition64(BlockX, BlockY, BlockZ))
    {
        return;
    }

    AString Lines[4];
    for (int i = 0; i < 4; i++)
    {
        HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Line);
        Lines[i] = Line;
    }

    m_Client->HandleUpdateSign(BlockX, BlockY, BlockZ, Lines[0], Lines[1], Lines[2], Lines[3]);
}





void cProtocol_1_9_0::HandlePacketUseEntity(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarInt, UInt32, EntityID);
    HANDLE_READ(a_ByteBuffer, ReadVarInt, UInt32, Type);

    switch (Type)
    {
        case 0:
        {
            HANDLE_READ(a_ByteBuffer, ReadVarInt, UInt32, Hand);
            if (Hand == MAIN_HAND)  // TODO: implement handling of off-hand actions; ignore them for now to avoid processing actions twice
            {
                m_Client->HandleUseEntity(EntityID, false);
            }
            break;
        }
        case 1:
        {
            m_Client->HandleUseEntity(EntityID, true);
            break;
        }
        case 2:
        {
            HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, TargetX);
            HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, TargetY);
            HANDLE_READ(a_ByteBuffer, ReadBEFloat, float, TargetZ);
            HANDLE_READ(a_ByteBuffer, ReadVarInt, UInt32, Hand);

            // TODO: Do anything
            break;
        }
        default:
        {
            ASSERT(!"Unhandled use entity type!");
            return;
        }
    }
}





void cProtocol_1_9_0::HandlePacketUseItem(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadVarInt, Int32, Hand);

    m_Client->HandleUseItem(HandIntToEnum(Hand));
}





void cProtocol_1_9_0::HandlePacketEnchantItem(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, WindowID);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, Enchantment);

    m_Client->HandleEnchantItem(WindowID, Enchantment);
}





void cProtocol_1_9_0::HandlePacketVehicleMove(cByteBuffer & a_ByteBuffer)
{
    // This handles updating the vehicles location server side
    HANDLE_READ(a_ByteBuffer, ReadBEDouble, double, xPos);
    HANDLE_READ(a_ByteBuffer, ReadBEDouble, double, yPos);
    HANDLE_READ(a_ByteBuffer, ReadBEDouble, double, zPos);
    HANDLE_READ(a_ByteBuffer, ReadBEFloat,  float,  yaw);
    HANDLE_READ(a_ByteBuffer, ReadBEFloat,  float,  pitch);

    // Get the players vehicle
    cEntity * Vehicle = m_Client->GetPlayer()->GetAttached();

    if (Vehicle)
    {
        Vehicle->SetPosX(xPos);
        Vehicle->SetPosY(yPos);
        Vehicle->SetPosZ(zPos);
        Vehicle->SetYaw(yaw);
        Vehicle->SetPitch(pitch);
    }
}





void cProtocol_1_9_0::HandlePacketWindowClick(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8,  UInt8,  WindowID);
    HANDLE_READ(a_ByteBuffer, ReadBEInt16,  Int16,  SlotNum);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8,  UInt8,  Button);
    HANDLE_READ(a_ByteBuffer, ReadBEUInt16, UInt16, TransactionID);
    HANDLE_READ(a_ByteBuffer, ReadVarInt32,  UInt32,  Mode);
    cItem Item;
    ReadItem(a_ByteBuffer, Item);

    // Convert Button, Mode, SlotNum and HeldItem into eClickAction:
    eClickAction Action;
    switch ((Mode << 8) | Button)
    {
        case 0x0000: Action = (SlotNum != SLOT_NUM_OUTSIDE) ? caLeftClick  : caLeftClickOutside;  break;
        case 0x0001: Action = (SlotNum != SLOT_NUM_OUTSIDE) ? caRightClick : caRightClickOutside; break;
        case 0x0100: Action = caShiftLeftClick;  break;
        case 0x0101: Action = caShiftRightClick; break;
        case 0x0200: Action = caNumber1;         break;
        case 0x0201: Action = caNumber2;         break;
        case 0x0202: Action = caNumber3;         break;
        case 0x0203: Action = caNumber4;         break;
        case 0x0204: Action = caNumber5;         break;
        case 0x0205: Action = caNumber6;         break;
        case 0x0206: Action = caNumber7;         break;
        case 0x0207: Action = caNumber8;         break;
        case 0x0208: Action = caNumber9;         break;
        case 0x0302: Action = caMiddleClick;     break;
        case 0x0400: Action = (SlotNum == SLOT_NUM_OUTSIDE) ? caLeftClickOutsideHoldNothing  : caDropKey;     break;
        case 0x0401: Action = (SlotNum == SLOT_NUM_OUTSIDE) ? caRightClickOutsideHoldNothing : caCtrlDropKey; break;
        case 0x0500: Action = (SlotNum == SLOT_NUM_OUTSIDE) ? caLeftPaintBegin               : caUnknown;     break;
        case 0x0501: Action = (SlotNum != SLOT_NUM_OUTSIDE) ? caLeftPaintProgress            : caUnknown;     break;
        case 0x0502: Action = (SlotNum == SLOT_NUM_OUTSIDE) ? caLeftPaintEnd                 : caUnknown;     break;
        case 0x0504: Action = (SlotNum == SLOT_NUM_OUTSIDE) ? caRightPaintBegin              : caUnknown;     break;
        case 0x0505: Action = (SlotNum != SLOT_NUM_OUTSIDE) ? caRightPaintProgress           : caUnknown;     break;
        case 0x0506: Action = (SlotNum == SLOT_NUM_OUTSIDE) ? caRightPaintEnd                : caUnknown;     break;
        case 0x0508: Action = (SlotNum == SLOT_NUM_OUTSIDE) ? caMiddlePaintBegin             : caUnknown;     break;
        case 0x0509: Action = (SlotNum != SLOT_NUM_OUTSIDE) ? caMiddlePaintProgress          : caUnknown;     break;
        case 0x050a: Action = (SlotNum == SLOT_NUM_OUTSIDE) ? caMiddlePaintEnd               : caUnknown;     break;
        case 0x0600: Action = caDblClick; break;
        default:
        {
            LOGWARNING("Unhandled window click mode / button combination: %d (0x%x)", (Mode << 8) | Button, (Mode << 8) | Button);
            Action = caUnknown;
            break;
        }
    }

    m_Client->HandleWindowClick(WindowID, SlotNum, Action, Item);
}





void cProtocol_1_9_0::HandlePacketWindowClose(cByteBuffer & a_ByteBuffer)
{
    HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, WindowID);
    m_Client->HandleWindowClose(WindowID);
}





void cProtocol_1_9_0::HandleVanillaPluginMessage(cByteBuffer & a_ByteBuffer, const AString & a_Channel)
{
    if (a_Channel == "MC|AdvCdm")
    {
        HANDLE_READ(a_ByteBuffer, ReadBEUInt8, UInt8, Mode);
        switch (Mode)
        {
            case 0x00:
            {
                HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockX);
                HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockY);
                HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, BlockZ);
                HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Command);
                m_Client->HandleCommandBlockBlockChange(BlockX, BlockY, BlockZ, Command);
                break;
            }

            default:
            {
                m_Client->SendChat(Printf("Failure setting command block command; unhandled mode %u (0x%02x)", Mode, Mode), mtFailure);
                LOG("Unhandled MC|AdvCdm packet mode.");
                return;
            }
        }  // switch (Mode)
        return;
    }
    else if (a_Channel == "MC|Brand")
    {
        HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, Brand);
        m_Client->SetClientBrand(Brand);
        // Send back our brand, including the length:
        SendPluginMessage("MC|Brand", "\x08""Cuberite");
        return;
    }
    else if (a_Channel == "MC|Beacon")
    {
        HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, Effect1);
        HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, Effect2);
        m_Client->HandleBeaconSelection(Effect1, Effect2);
        return;
    }
    else if (a_Channel == "MC|ItemName")
    {
        HANDLE_READ(a_ByteBuffer, ReadVarUTF8String, AString, ItemName);
        m_Client->HandleAnvilItemName(ItemName);
        return;
    }
    else if (a_Channel == "MC|TrSel")
    {
        HANDLE_READ(a_ByteBuffer, ReadBEInt32, Int32, SlotNum);
        m_Client->HandleNPCTrade(SlotNum);
        return;
    }
    LOG("Unhandled vanilla plugin channel: \"%s\".", a_Channel.c_str());

    // Read the payload and send it through to the clienthandle:
    AString Message;
    VERIFY(a_ByteBuffer.ReadString(Message, a_ByteBuffer.GetReadableSpace() - 1));
    m_Client->HandlePluginMessage(a_Channel, Message);
}





void cProtocol_1_9_0::SendData(const char * a_Data, size_t a_Size)
{
    if (m_IsEncrypted)
    {
        Byte Encrypted[8192];  // Larger buffer, we may be sending lots of data (chunks)
        while (a_Size > 0)
        {
            size_t NumBytes = (a_Size > sizeof(Encrypted)) ? sizeof(Encrypted) : a_Size;
            m_Encryptor.ProcessData(Encrypted, reinterpret_cast<const Byte *>(a_Data), NumBytes);
            m_Client->SendData(reinterpret_cast<const char *>(Encrypted), NumBytes);
            a_Size -= NumBytes;
            a_Data += NumBytes;
        }
    }
    else
    {
        m_Client->SendData(a_Data, a_Size);
    }
}





bool cProtocol_1_9_0::ReadItem(cByteBuffer & a_ByteBuffer, cItem & a_Item, size_t a_KeepRemainingBytes)
{
    HANDLE_PACKET_READ(a_ByteBuffer, ReadBEInt16, Int16, ItemType);
    if (ItemType == -1)
    {
        // The item is empty, no more data follows
        a_Item.Empty();
        return true;
    }
    a_Item.m_ItemType = ItemType;

    HANDLE_PACKET_READ(a_ByteBuffer, ReadBEInt8,  Int8,  ItemCount);
    HANDLE_PACKET_READ(a_ByteBuffer, ReadBEInt16, Int16, ItemDamage);
    a_Item.m_ItemCount  = ItemCount;
    a_Item.m_ItemDamage = ItemDamage;
    if (ItemCount <= 0)
    {
        a_Item.Empty();
    }

    AString Metadata;
    if (!a_ByteBuffer.ReadString(Metadata, a_ByteBuffer.GetReadableSpace() - a_KeepRemainingBytes - 1) || (Metadata.size() == 0) || (Metadata[0] == 0))
    {
        // No metadata
        return true;
    }

    ParseItemMetadata(a_Item, Metadata);
    return true;
}





void cProtocol_1_9_0::ParseItemMetadata(cItem & a_Item, const AString & a_Metadata)
{
    // Parse into NBT:
    cParsedNBT NBT(a_Metadata.data(), a_Metadata.size());
    if (!NBT.IsValid())
    {
        AString HexDump;
        CreateHexDump(HexDump, a_Metadata.data(), std::max<size_t>(a_Metadata.size(), 1024), 16);
        LOGWARNING("Cannot parse NBT item metadata: %s at (%zu / %zu bytes)\n%s",
            NBT.GetErrorCode().message().c_str(), NBT.GetErrorPos(), a_Metadata.size(), HexDump.c_str()
        );
        return;
    }

    // Load enchantments and custom display names from the NBT data:
    for (int tag = NBT.GetFirstChild(NBT.GetRoot()); tag >= 0; tag = NBT.GetNextSibling(tag))
    {
        AString TagName = NBT.GetName(tag);
        switch (NBT.GetType(tag))
        {
            case TAG_List:
            {
                if ((TagName == "ench") || (TagName == "StoredEnchantments"))  // Enchantments tags
                {
                    EnchantmentSerializer::ParseFromNBT(a_Item.m_Enchantments, NBT, tag);
                }
                break;
            }
            case TAG_Compound:
            {
                if (TagName == "display")  // Custom name and lore tag
                {
                    for (int displaytag = NBT.GetFirstChild(tag); displaytag >= 0; displaytag = NBT.GetNextSibling(displaytag))
                    {
                        if ((NBT.GetType(displaytag) == TAG_String) && (NBT.GetName(displaytag) == "Name"))  // Custon name tag
                        {
                            a_Item.m_CustomName = NBT.GetString(displaytag);
                        }
                        else if ((NBT.GetType(displaytag) == TAG_List) && (NBT.GetName(displaytag) == "Lore"))  // Lore tag
                        {
                            a_Item.m_LoreTable.clear();
                            for (int loretag = NBT.GetFirstChild(displaytag); loretag >= 0; loretag = NBT.GetNextSibling(loretag))  // Loop through array of strings
                            {
                                a_Item.m_LoreTable.push_back(NBT.GetString(loretag));
                            }
                        }
                        else if ((NBT.GetType(displaytag) == TAG_Int) && (NBT.GetName(displaytag) == "color"))
                        {
                            a_Item.m_ItemColor.m_Color = static_cast<unsigned int>(NBT.GetInt(displaytag));
                        }
                    }
                }
                else if ((TagName == "Fireworks") || (TagName == "Explosion"))
                {
                    cFireworkItem::ParseFromNBT(a_Item.m_FireworkItem, NBT, tag, static_cast<ENUM_ITEM_ID>(a_Item.m_ItemType));
                }
                else if (TagName == "EntityTag")
                {
                    for (int entitytag = NBT.GetFirstChild(tag); entitytag >= 0; entitytag = NBT.GetNextSibling(entitytag))
                    {
                        if ((NBT.GetType(entitytag) == TAG_String) && (NBT.GetName(entitytag) == "id"))
                        {
                            AString NBTName = NBT.GetString(entitytag);
                            ReplaceString(NBTName, "minecraft:", "");
                            eMonsterType MonsterType = cMonster::StringToMobType(NBTName);
                            a_Item.m_ItemDamage = static_cast<short>(MonsterType);

                        }
                    }
                }
                break;
            }
            case TAG_Int:
            {
                if (TagName == "RepairCost")
                {
                    a_Item.m_RepairCost = NBT.GetInt(tag);
                }
                break;
            }
            case TAG_String:
            {
                if (TagName == "Potion")
                {
                    AString PotionEffect = NBT.GetString(tag);
                    if (PotionEffect.find("minecraft:") == AString::npos)
                    {
                        LOGD("Unknown or missing domain on potion effect name %s!", PotionEffect.c_str());
                        continue;
                    }

                    if (PotionEffect.find("water") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 0;
                        // Water bottles shouldn't have other bits set on them; exit early.
                        continue;
                    }
                    if (PotionEffect.find("empty") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 0;
                    }
                    else if (PotionEffect.find("mundane") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 0;
                    }
                    else if (PotionEffect.find("thick") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 32;
                    }
                    else if (PotionEffect.find("awkward") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 16;
                    }
                    else if (PotionEffect.find("regeneration") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 1;
                    }
                    else if (PotionEffect.find("swiftness") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 2;
                    }
                    else if (PotionEffect.find("fire_resistance") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 3;
                    }
                    else if (PotionEffect.find("poison") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 4;
                    }
                    else if (PotionEffect.find("healing") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 5;
                    }
                    else if (PotionEffect.find("night_vision") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 6;
                    }
                    else if (PotionEffect.find("weakness") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 8;
                    }
                    else if (PotionEffect.find("strength") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 9;
                    }
                    else if (PotionEffect.find("slowness") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 10;
                    }
                    else if (PotionEffect.find("leaping") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 11;
                    }
                    else if (PotionEffect.find("harming") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 12;
                    }
                    else if (PotionEffect.find("water_breathing") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 13;
                    }
                    else if (PotionEffect.find("invisibility") != AString::npos)
                    {
                        a_Item.m_ItemDamage = 14;
                    }
                    else
                    {
                        // Note: luck potions are not handled and will reach this location
                        LOGD("Unknown potion type for effect name %s!", PotionEffect.c_str());
                        continue;
                    }

                    if (PotionEffect.find("strong") != AString::npos)
                    {
                        a_Item.m_ItemDamage |= 0x20;
                    }
                    if (PotionEffect.find("long") != AString::npos)
                    {
                        a_Item.m_ItemDamage |= 0x40;
                    }

                    // Ugly special case with the changed splash potion ID in 1.9
                    if ((a_Item.m_ItemType == 438) || (a_Item.m_ItemType == 441))
                    {
                        // Splash or lingering potions - change the ID to the normal one and mark as splash potions
                        a_Item.m_ItemType = E_ITEM_POTION;
                        a_Item.m_ItemDamage |= 0x4000;  // Is splash potion
                    }
                    else
                    {
                        a_Item.m_ItemDamage |= 0x2000;  // Is drinkable
                    }
                }
                break;
            }
            default: LOGD("Unimplemented NBT data when parsing!"); break;
        }
    }
}





void cProtocol_1_9_0::StartEncryption(const Byte * a_Key)
{
    m_Encryptor.Init(a_Key, a_Key);
    m_Decryptor.Init(a_Key, a_Key);
    m_IsEncrypted = true;

    // Prepare the m_AuthServerID:
    cSha1Checksum Checksum;
    cServer * Server = cRoot::Get()->GetServer();
    const AString & ServerID = Server->GetServerID();
    Checksum.Update(reinterpret_cast<const Byte *>(ServerID.c_str()), ServerID.length());
    Checksum.Update(a_Key, 16);
    Checksum.Update(reinterpret_cast<const Byte *>(Server->GetPublicKeyDER().data()), Server->GetPublicKeyDER().size());
    Byte Digest[20];
    Checksum.Finalize(Digest);
    cSha1Checksum::DigestToJava(Digest, m_AuthServerID);
}





eBlockFace cProtocol_1_9_0::FaceIntToBlockFace(Int32 a_BlockFace)
{
    // Normalize the blockface values returned from the protocol
    // Anything known gets mapped 1:1, everything else returns BLOCK_FACE_NONE
    switch (a_BlockFace)
    {
        case BLOCK_FACE_XM: return BLOCK_FACE_XM;
        case BLOCK_FACE_XP: return BLOCK_FACE_XP;
        case BLOCK_FACE_YM: return BLOCK_FACE_YM;
        case BLOCK_FACE_YP: return BLOCK_FACE_YP;
        case BLOCK_FACE_ZM: return BLOCK_FACE_ZM;
        case BLOCK_FACE_ZP: return BLOCK_FACE_ZP;
        default: return BLOCK_FACE_NONE;
    }
}





eHand cProtocol_1_9_0::HandIntToEnum(Int32 a_Hand)
{
    // Convert hand parameter into eHand enum
    switch (a_Hand)
    {
        case MAIN_HAND: return eHand::hMain;
        case OFF_HAND: return eHand::hOff;
        default:
        {
            ASSERT(!"Unknown hand value");
            return eHand::hMain;
        }
    }
}





void cProtocol_1_9_0::SendPacket(cPacketizer & a_Pkt)
{
    UInt32 PacketLen = static_cast<UInt32>(m_OutPacketBuffer.GetUsedSpace());
    AString PacketData, CompressedPacket;
    m_OutPacketBuffer.ReadAll(PacketData);
    m_OutPacketBuffer.CommitRead();

    if ((m_State == 3) && (PacketLen >= 256))
    {
        // Compress the packet payload:
        if (!cProtocol_1_9_0::CompressPacket(PacketData, CompressedPacket))
        {
            return;
        }
    }
    else if (m_State == 3)
    {
        // The packet is not compressed, indicate this in the packet header:
        m_OutPacketLenBuffer.WriteVarInt32(PacketLen + 1);
        m_OutPacketLenBuffer.WriteVarInt32(0);
        AString LengthData;
        m_OutPacketLenBuffer.ReadAll(LengthData);
        SendData(LengthData.data(), LengthData.size());
    }
    else
    {
        // Compression doesn't apply to this state, send raw data:
        m_OutPacketLenBuffer.WriteVarInt32(PacketLen);
        AString LengthData;
        m_OutPacketLenBuffer.ReadAll(LengthData);
        SendData(LengthData.data(), LengthData.size());
    }

    // Send the packet's payload, either direct or compressed:
    if (CompressedPacket.empty())
    {
        m_OutPacketLenBuffer.CommitRead();
        SendData(PacketData.data(), PacketData.size());
    }
    else
    {
        SendData(CompressedPacket.data(), CompressedPacket.size());
    }

    // Log the comm into logfile:
    if (g_ShouldLogCommOut && m_CommLogFile.IsOpen())
    {
        AString Hex;
        ASSERT(PacketData.size() > 0);
        CreateHexDump(Hex, PacketData.data(), PacketData.size(), 16);
        m_CommLogFile.Printf("Outgoing packet: type %s (translated to 0x%02x), length %u (0x%04x), state %d. Payload (incl. type):\n%s\n",
            cPacketizer::PacketTypeToStr(a_Pkt.GetPacketType()), GetPacketID(a_Pkt.GetPacketType()),
            PacketLen, PacketLen, m_State, Hex
        );
        /*
        // Useful for debugging a new protocol:
        LOGD("Outgoing packet: type %s (translated to 0x%02x), length %u (0x%04x), state %d. Payload (incl. type):\n%s\n",
            cPacketizer::PacketTypeToStr(a_Pkt.GetPacketType()), GetPacketID(a_Pkt.GetPacketType()),
            PacketLen, PacketLen, m_State, Hex
        );
        //*/
    }
    /*
    // Useful for debugging a new protocol:
    std::this_thread::sleep_for(std::chrono::milliseconds(100));
    */
}





void cProtocol_1_9_0::WriteItem(cPacketizer & a_Pkt, const cItem & a_Item)
{
    short ItemType = a_Item.m_ItemType;
    ASSERT(ItemType >= -1);  // Check validity of packets in debug runtime
    if (ItemType <= 0)
    {
        // Fix, to make sure no invalid values are sent.
        ItemType = -1;
    }

    if (a_Item.IsEmpty())
    {
        a_Pkt.WriteBEInt16(-1);
        return;
    }

    if ((ItemType == E_ITEM_POTION) && ((a_Item.m_ItemDamage & 0x4000) != 0))
    {
        // Ugly special case for splash potion ids which changed in 1.9; this can be removed when the new 1.9 ids are implemented
        a_Pkt.WriteBEInt16(438);  // minecraft:splash_potion
    }
    else
    {
        // Normal item
        a_Pkt.WriteBEInt16(ItemType);
    }
    a_Pkt.WriteBEInt8(a_Item.m_ItemCount);
    if ((ItemType == E_ITEM_POTION) || (ItemType == E_ITEM_SPAWN_EGG))
    {
        // These items lost their metadata; if it is sent they don't render correctly.
        a_Pkt.WriteBEInt16(0);
    }
    else
    {
        a_Pkt.WriteBEInt16(a_Item.m_ItemDamage);
    }

    if (a_Item.m_Enchantments.IsEmpty() && a_Item.IsBothNameAndLoreEmpty() && (ItemType != E_ITEM_FIREWORK_ROCKET) && (ItemType != E_ITEM_FIREWORK_STAR) && !a_Item.m_ItemColor.IsValid() && (ItemType != E_ITEM_POTION) && (ItemType != E_ITEM_SPAWN_EGG))
    {
        a_Pkt.WriteBEInt8(0);
        return;
    }


    // Send the enchantments and custom names:
    cFastNBTWriter Writer;
    if (a_Item.m_RepairCost != 0)
    {
        Writer.AddInt("RepairCost", a_Item.m_RepairCost);
    }
    if (!a_Item.m_Enchantments.IsEmpty())
    {
        const char * TagName = (a_Item.m_ItemType == E_ITEM_BOOK) ? "StoredEnchantments" : "ench";
        EnchantmentSerializer::WriteToNBTCompound(a_Item.m_Enchantments, Writer, TagName);
    }
    if (!a_Item.IsBothNameAndLoreEmpty() || a_Item.m_ItemColor.IsValid())
    {
        Writer.BeginCompound("display");
        if (a_Item.m_ItemColor.IsValid())
        {
            Writer.AddInt("color", static_cast<Int32>(a_Item.m_ItemColor.m_Color));
        }

        if (!a_Item.IsCustomNameEmpty())
        {
            Writer.AddString("Name", a_Item.m_CustomName.c_str());
        }
        if (!a_Item.IsLoreEmpty())
        {
            Writer.BeginList("Lore", TAG_String);

            for (const auto & Line : a_Item.m_LoreTable)
            {
                Writer.AddString("", Line);
            }

            Writer.EndList();
        }
        Writer.EndCompound();
    }
    if ((a_Item.m_ItemType == E_ITEM_FIREWORK_ROCKET) || (a_Item.m_ItemType == E_ITEM_FIREWORK_STAR))
    {
        cFireworkItem::WriteToNBTCompound(a_Item.m_FireworkItem, Writer, static_cast<ENUM_ITEM_ID>(a_Item.m_ItemType));
    }
    if (a_Item.m_ItemType == E_ITEM_POTION)
    {
        // 1.9 potions use a different format.  In the future (when only 1.9+ is supported) this should be its own class
        AString PotionID = "empty";  // Fallback of "Uncraftable potion" for unhandled cases

        cEntityEffect::eType Type = cEntityEffect::GetPotionEffectType(a_Item.m_ItemDamage);
        if (Type != cEntityEffect::effNoEffect)
        {
            switch (Type)
            {
                case cEntityEffect::effRegeneration: PotionID = "regeneration"; break;
                case cEntityEffect::effSpeed: PotionID = "swiftness"; break;
                case cEntityEffect::effFireResistance: PotionID = "fire_resistance"; break;
                case cEntityEffect::effPoison: PotionID = "poison"; break;
                case cEntityEffect::effInstantHealth: PotionID = "healing"; break;
                case cEntityEffect::effNightVision: PotionID = "night_vision"; break;
                case cEntityEffect::effWeakness: PotionID = "weakness"; break;
                case cEntityEffect::effStrength: PotionID = "strength"; break;
                case cEntityEffect::effSlowness: PotionID = "slowness"; break;
                case cEntityEffect::effJumpBoost: PotionID = "leaping"; break;
                case cEntityEffect::effInstantDamage: PotionID = "harming"; break;
                case cEntityEffect::effWaterBreathing: PotionID = "water_breathing"; break;
                case cEntityEffect::effInvisibility: PotionID = "invisibility"; break;
                default: ASSERT(!"Unknown potion effect"); break;
            }
            if (cEntityEffect::GetPotionEffectIntensity(a_Item.m_ItemDamage) == 1)
            {
                PotionID = "strong_" + PotionID;
            }
            else if (a_Item.m_ItemDamage & 0x40)
            {
                // Extended potion bit
                PotionID = "long_" + PotionID;
            }
        }
        else
        {
            // Empty potions: Water bottles and other base ones
            if (a_Item.m_ItemDamage == 0)
            {
                // No other bits set; thus it's a water bottle
                PotionID = "water";
            }
            else
            {
                switch (a_Item.m_ItemDamage & 0x3f)
                {
                    case 0x00: PotionID = "mundane"; break;
                    case 0x10: PotionID = "awkward"; break;
                    case 0x20: PotionID = "thick"; break;
                }
                // Default cases will use "empty" from before.
            }
        }

        PotionID = "minecraft:" + PotionID;

        Writer.AddString("Potion", PotionID.c_str());
    }
    if (a_Item.m_ItemType == E_ITEM_SPAWN_EGG)
    {
        // Convert entity ID to the name.
        eMonsterType MonsterType = cItemSpawnEggHandler::ItemDamageToMonsterType(a_Item.m_ItemDamage);
        if (MonsterType != eMonsterType::mtInvalidType)
        {
            Writer.BeginCompound("EntityTag");
            Writer.AddString("id", "minecraft:" + cMonster::MobTypeToVanillaNBT(MonsterType));
            Writer.EndCompound();
        }
    }

    Writer.Finish();

    AString Result = Writer.GetResult();
    if (Result.size() == 0)
    {
        a_Pkt.WriteBEInt8(0);
        return;
    }
    a_Pkt.WriteBuf(Result.data(), Result.size());
}





void cProtocol_1_9_0::WriteBlockEntity(cPacketizer & a_Pkt, const cBlockEntity & a_BlockEntity)
{
    cFastNBTWriter Writer;

    switch (a_BlockEntity.GetBlockType())
    {
        case E_BLOCK_BEACON:
        {
            auto & BeaconEntity = static_cast<const cBeaconEntity &>(a_BlockEntity);
            Writer.AddInt("x",         BeaconEntity.GetPosX());
            Writer.AddInt("y",         BeaconEntity.GetPosY());
            Writer.AddInt("z",         BeaconEntity.GetPosZ());
            Writer.AddInt("Primary",   BeaconEntity.GetPrimaryEffect());
            Writer.AddInt("Secondary", BeaconEntity.GetSecondaryEffect());
            Writer.AddInt("Levels",    BeaconEntity.GetBeaconLevel());
            Writer.AddString("id", "Beacon");  // "Tile Entity ID" - MC wiki; vanilla server always seems to send this though
            break;
        }

        case E_BLOCK_COMMAND_BLOCK:
        {
            auto & CommandBlockEntity = static_cast<const cCommandBlockEntity &>(a_BlockEntity);
            Writer.AddByte("TrackOutput", 1);  // Neither I nor the MC wiki has any idea about this
            Writer.AddInt("SuccessCount", CommandBlockEntity.GetResult());
            Writer.AddInt("x", CommandBlockEntity.GetPosX());
            Writer.AddInt("y", CommandBlockEntity.GetPosY());
            Writer.AddInt("z", CommandBlockEntity.GetPosZ());
            Writer.AddString("Command", CommandBlockEntity.GetCommand().c_str());
            // You can set custom names for windows in Vanilla
            // For a command block, this would be the 'name' prepended to anything it outputs into global chat
            // MCS doesn't have this, so just leave it @ '@'. (geddit?)
            Writer.AddString("CustomName", "@");
            Writer.AddString("id", "Control");  // "Tile Entity ID" - MC wiki; vanilla server always seems to send this though
            if (!CommandBlockEntity.GetLastOutput().empty())
            {
                Writer.AddString("LastOutput", Printf("{\"text\":\"%s\"}", CommandBlockEntity.GetLastOutput().c_str()));
            }
            break;
        }

        case E_BLOCK_HEAD:
        {
            auto & MobHeadEntity = static_cast<const cMobHeadEntity &>(a_BlockEntity);
            Writer.AddInt("x", MobHeadEntity.GetPosX());
            Writer.AddInt("y", MobHeadEntity.GetPosY());
            Writer.AddInt("z", MobHeadEntity.GetPosZ());
            Writer.AddByte("SkullType", MobHeadEntity.GetType() & 0xFF);
            Writer.AddByte("Rot", MobHeadEntity.GetRotation() & 0xFF);
            Writer.AddString("id", "Skull");  // "Tile Entity ID" - MC wiki; vanilla server always seems to send this though

            // The new Block Entity format for a Mob Head. See: https://minecraft.gamepedia.com/Head#Block_entity
            Writer.BeginCompound("Owner");
                Writer.AddString("Id", MobHeadEntity.GetOwnerUUID().ToShortString());
                Writer.AddString("Name", MobHeadEntity.GetOwnerName());
                Writer.BeginCompound("Properties");
                    Writer.BeginList("textures", TAG_Compound);
                        Writer.BeginCompound("");
                            Writer.AddString("Signature", MobHeadEntity.GetOwnerTextureSignature());
                            Writer.AddString("Value", MobHeadEntity.GetOwnerTexture());
                        Writer.EndCompound();
                    Writer.EndList();
                Writer.EndCompound();
            Writer.EndCompound();
            break;
        }

        case E_BLOCK_FLOWER_POT:
        {
            auto & FlowerPotEntity = static_cast<const cFlowerPotEntity &>(a_BlockEntity);
            Writer.AddInt("x", FlowerPotEntity.GetPosX());
            Writer.AddInt("y", FlowerPotEntity.GetPosY());
            Writer.AddInt("z", FlowerPotEntity.GetPosZ());
            Writer.AddInt("Item", static_cast<Int32>(FlowerPotEntity.GetItem().m_ItemType));
            Writer.AddInt("Data", static_cast<Int32>(FlowerPotEntity.GetItem().m_ItemDamage));
            Writer.AddString("id", "FlowerPot");  // "Tile Entity ID" - MC wiki; vanilla server always seems to send this though
            break;
        }

        case E_BLOCK_MOB_SPAWNER:
        {
            auto & MobSpawnerEntity = static_cast<const cMobSpawnerEntity &>(a_BlockEntity);
            Writer.AddInt("x", MobSpawnerEntity.GetPosX());
            Writer.AddInt("y", MobSpawnerEntity.GetPosY());
            Writer.AddInt("z", MobSpawnerEntity.GetPosZ());
            Writer.BeginCompound("SpawnData");
                Writer.AddString("id", cMonster::MobTypeToVanillaName(MobSpawnerEntity.GetEntity()));
            Writer.EndCompound();
            Writer.AddShort("Delay", MobSpawnerEntity.GetSpawnDelay());
            Writer.AddString("id", "MobSpawner");
            break;
        }

        default:
        {
            break;
        }
    }

    Writer.Finish();
    a_Pkt.WriteBuf(Writer.GetResult().data(), Writer.GetResult().size());
}





void cProtocol_1_9_0::WriteEntityMetadata(cPacketizer & a_Pkt, const cEntity & a_Entity)
{
    // Common metadata:
    Int8 Flags = 0;
    if (a_Entity.IsOnFire())
    {
        Flags |= 0x01;
    }
    if (a_Entity.IsCrouched())
    {
        Flags |= 0x02;
    }
    if (a_Entity.IsSprinting())
    {
        Flags |= 0x08;
    }
    if (a_Entity.IsRclking())
    {
        Flags |= 0x10;
    }
    if (a_Entity.IsInvisible())
    {
        Flags |= 0x20;
    }
    a_Pkt.WriteBEUInt8(0);  // Index 0
    a_Pkt.WriteBEUInt8(METADATA_TYPE_BYTE);  // Type
    a_Pkt.WriteBEInt8(Flags);

    switch (a_Entity.GetEntityType())
    {
        case cEntity::etPlayer:
        {
            auto & Player = static_cast<const cPlayer &>(a_Entity);

            // TODO Set player custom name to their name.
            // Then it's possible to move the custom name of mobs to the entities
            // and to remove the "special" player custom name.
            a_Pkt.WriteBEUInt8(2);  // Index 2: Custom name
            a_Pkt.WriteBEUInt8(METADATA_TYPE_STRING);
            a_Pkt.WriteString(Player.GetName());

            a_Pkt.WriteBEUInt8(6);  // Index 6: Health
            a_Pkt.WriteBEUInt8(METADATA_TYPE_FLOAT);
            a_Pkt.WriteBEFloat(static_cast<float>(Player.GetHealth()));

            a_Pkt.WriteBEUInt8(12);
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BYTE);
            a_Pkt.WriteBEUInt8(static_cast<UInt8>(Player.GetSkinParts()));

            a_Pkt.WriteBEUInt8(13);
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BYTE);
            a_Pkt.WriteBEUInt8(static_cast<UInt8>(Player.GetMainHand()));
            break;
        }
        case cEntity::etPickup:
        {
            a_Pkt.WriteBEUInt8(5);  // Index 5: Item
            a_Pkt.WriteBEUInt8(METADATA_TYPE_ITEM);
            WriteItem(a_Pkt, static_cast<const cPickup &>(a_Entity).GetItem());
            break;
        }
        case cEntity::etMinecart:
        {
            a_Pkt.WriteBEUInt8(5);  // Index 5: Shaking power
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);

            // The following expression makes Minecarts shake more with less health or higher damage taken
            auto & Minecart = static_cast<const cMinecart &>(a_Entity);
            auto maxHealth = a_Entity.GetMaxHealth();
            auto curHealth = a_Entity.GetHealth();
            a_Pkt.WriteVarInt32(static_cast<UInt32>((maxHealth - curHealth) * Minecart.LastDamage() * 4));

            a_Pkt.WriteBEUInt8(6);  // Index 6: Shaking direction (doesn't seem to effect anything)
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(1);

            a_Pkt.WriteBEUInt8(7);  // Index 7: Shake multiplier / damage taken
            a_Pkt.WriteBEUInt8(METADATA_TYPE_FLOAT);
            a_Pkt.WriteBEFloat(static_cast<float>(Minecart.LastDamage() + 10));

            if (Minecart.GetPayload() == cMinecart::mpNone)
            {
                auto & RideableMinecart = static_cast<const cRideableMinecart &>(Minecart);
                const cItem & MinecartContent = RideableMinecart.GetContent();
                if (!MinecartContent.IsEmpty())
                {
                    a_Pkt.WriteBEUInt8(8);  // Index 8: Block ID and damage
                    a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
                    int Content = MinecartContent.m_ItemType;
                    Content |= MinecartContent.m_ItemDamage << 8;
                    a_Pkt.WriteVarInt32(static_cast<UInt32>(Content));

                    a_Pkt.WriteBEUInt8(9);  // Index 9: Block ID and damage
                    a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
                    a_Pkt.WriteVarInt32(static_cast<UInt32>(RideableMinecart.GetBlockHeight()));

                    a_Pkt.WriteBEUInt8(10);  // Index 10: Show block
                    a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
                    a_Pkt.WriteBool(true);
                }
            }
            else if (Minecart.GetPayload() == cMinecart::mpFurnace)
            {
                a_Pkt.WriteBEUInt8(11);  // Index 11: Is powered
                a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
                a_Pkt.WriteBool(static_cast<const cMinecartWithFurnace &>(Minecart).IsFueled());
            }
            break;
        }  // case etMinecart

        case cEntity::etProjectile:
        {
            auto & Projectile = static_cast<const cProjectileEntity &>(a_Entity);
            switch (Projectile.GetProjectileKind())
            {
                case cProjectileEntity::pkArrow:
                {
                    a_Pkt.WriteBEUInt8(5);  // Index 5: Is critical
                    a_Pkt.WriteBEUInt8(METADATA_TYPE_BYTE);
                    a_Pkt.WriteBEInt8(static_cast<const cArrowEntity &>(Projectile).IsCritical() ? 1 : 0);
                    break;
                }
                case cProjectileEntity::pkFirework:
                {
                    a_Pkt.WriteBEUInt8(5);  // Index 5: Firework item used for this firework
                    a_Pkt.WriteBEUInt8(METADATA_TYPE_ITEM);
                    WriteItem(a_Pkt, static_cast<const cFireworkEntity &>(Projectile).GetItem());
                    break;
                }
                case cProjectileEntity::pkSplashPotion:
                {
                    a_Pkt.WriteBEUInt8(5);  // Index 5: Potion item which was thrown
                    a_Pkt.WriteBEUInt8(METADATA_TYPE_ITEM);
                    WriteItem(a_Pkt, static_cast<const cSplashPotionEntity &>(Projectile).GetItem());
                }
                default:
                {
                    break;
                }
            }
            break;
        }  // case etProjectile

        case cEntity::etMonster:
        {
            WriteMobMetadata(a_Pkt, static_cast<const cMonster &>(a_Entity));
            break;
        }

        case cEntity::etBoat:
        {
            auto & Boat = static_cast<const cBoat &>(a_Entity);

            a_Pkt.WriteBEInt8(5);  // Index 6: Time since last hit
            a_Pkt.WriteBEInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Boat.GetLastDamage()));

            a_Pkt.WriteBEInt8(6);  // Index 7: Forward direction
            a_Pkt.WriteBEInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Boat.GetForwardDirection()));

            a_Pkt.WriteBEInt8(7);  // Index 8: Damage taken
            a_Pkt.WriteBEInt8(METADATA_TYPE_FLOAT);
            a_Pkt.WriteBEFloat(Boat.GetDamageTaken());

            a_Pkt.WriteBEInt8(8);  // Index 9: Type
            a_Pkt.WriteBEInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Boat.GetMaterial()));

            a_Pkt.WriteBEInt8(9);  // Index 10: Right paddle turning
            a_Pkt.WriteBEInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Boat.IsRightPaddleUsed());

            a_Pkt.WriteBEInt8(10);  // Index 11: Left paddle turning
            a_Pkt.WriteBEInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Boat.IsLeftPaddleUsed());

            break;
        }  // case etBoat

        case cEntity::etItemFrame:
        {
            auto & Frame = static_cast<const cItemFrame &>(a_Entity);
            a_Pkt.WriteBEUInt8(5);  // Index 5: Item
            a_Pkt.WriteBEUInt8(METADATA_TYPE_ITEM);
            WriteItem(a_Pkt, Frame.GetItem());
            a_Pkt.WriteBEUInt8(6);  // Index 6: Rotation
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(Frame.GetItemRotation());
            break;
        }  // case etItemFrame

        default:
        {
            break;
        }
    }
}





void cProtocol_1_9_0::WriteMobMetadata(cPacketizer & a_Pkt, const cMonster & a_Mob)
{
    // Living Enitiy Metadata
    if (a_Mob.HasCustomName())
    {
        // TODO: As of 1.9 _all_ entities can have custom names; should this be moved up?
        a_Pkt.WriteBEUInt8(2);  // Index 2: Custom name
        a_Pkt.WriteBEUInt8(METADATA_TYPE_STRING);
        a_Pkt.WriteString(a_Mob.GetCustomName());

        a_Pkt.WriteBEUInt8(3);  // Index 3: Custom name always visible
        a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
        a_Pkt.WriteBool(a_Mob.IsCustomNameAlwaysVisible());
    }

    a_Pkt.WriteBEUInt8(6);  // Index 6: Health
    a_Pkt.WriteBEUInt8(METADATA_TYPE_FLOAT);
    a_Pkt.WriteBEFloat(static_cast<float>(a_Mob.GetHealth()));

    switch (a_Mob.GetMobType())
    {
        case mtBat:
        {
            auto & Bat = static_cast<const cBat &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Bat flags - currently only hanging
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BYTE);
            a_Pkt.WriteBEInt8(Bat.IsHanging() ? 1 : 0);
            break;
        }  // case mtBat

        case mtChicken:
        {
            auto & Chicken = static_cast<const cChicken &>(a_Mob);

            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Chicken.IsBaby());
            break;
        }  // case mtChicken

        case mtCow:
        {
            auto & Cow = static_cast<const cCow &>(a_Mob);

            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Cow.IsBaby());
            break;
        }  // case mtCow

        case mtCreeper:
        {
            auto & Creeper = static_cast<const cCreeper &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: State (idle or "blowing")
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(Creeper.IsBlowing() ? 1 : 0xffffffff);

            a_Pkt.WriteBEUInt8(12);  // Index 12: Is charged
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Creeper.IsCharged());

            a_Pkt.WriteBEUInt8(13);  // Index 13: Is ignited
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Creeper.IsBurnedWithFlintAndSteel());
            break;
        }  // case mtCreeper

        case mtEnderman:
        {
            auto & Enderman = static_cast<const cEnderman &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Carried block
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BLOCKID);
            UInt32 Carried = 0;
            Carried |= static_cast<UInt32>(Enderman.GetCarriedBlock() << 4);
            Carried |= Enderman.GetCarriedMeta();
            a_Pkt.WriteVarInt32(Carried);

            a_Pkt.WriteBEUInt8(12);  // Index 12: Is screaming
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Enderman.IsScreaming());
            break;
        }  // case mtEnderman

        case mtGhast:
        {
            auto & Ghast = static_cast<const cGhast &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Is attacking
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Ghast.IsCharging());
            break;
        }  // case mtGhast

        case mtHorse:
        {
            auto & Horse = static_cast<const cHorse &>(a_Mob);
            Int8 Flags = 0;
            if (Horse.IsTame())
            {
                Flags |= 0x02;
            }
            if (Horse.IsSaddled())
            {
                Flags |= 0x04;
            }
            if (Horse.IsChested())
            {
                Flags |= 0x08;
            }
            if (Horse.IsEating())
            {
                Flags |= 0x20;
            }
            if (Horse.IsRearing())
            {
                Flags |= 0x40;
            }
            if (Horse.IsMthOpen())
            {
                Flags |= 0x80;
            }
            a_Pkt.WriteBEUInt8(12);  // Index 12: flags
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BYTE);
            a_Pkt.WriteBEInt8(Flags);

            a_Pkt.WriteBEUInt8(13);  // Index 13: Variant / type
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Horse.GetHorseType()));

            a_Pkt.WriteBEUInt8(14);  // Index 14: Color / style
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            int Appearance = 0;
            Appearance = Horse.GetHorseColor();
            Appearance |= Horse.GetHorseStyle() << 8;
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Appearance));

            a_Pkt.WriteBEUInt8(16);  // Index 16: Armor
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Horse.GetHorseArmour()));

            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Horse.IsBaby());
            break;
        }  // case mtHorse

        case mtMagmaCube:
        {
            auto & MagmaCube = static_cast<const cMagmaCube &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Size
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(MagmaCube.GetSize()));
            break;
        }  // case mtMagmaCube

        case mtOcelot:
        {
            auto & Ocelot = static_cast<const cOcelot &>(a_Mob);

            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Ocelot.IsBaby());
            break;
        }  // case mtOcelot

        case mtPig:
        {
            auto & Pig = static_cast<const cPig &>(a_Mob);

            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Pig.IsBaby());

            a_Pkt.WriteBEUInt8(12);  // Index 12: Is saddled
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Pig.IsSaddled());

            break;
        }  // case mtPig

        case mtRabbit:
        {
            auto & Rabbit = static_cast<const cRabbit &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Rabbit.IsBaby());

            a_Pkt.WriteBEUInt8(12);  // Index 12: Type
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Rabbit.GetRabbitType()));
            break;
        }  // case mtRabbit

        case mtSheep:
        {
            auto & Sheep = static_cast<const cSheep &>(a_Mob);

            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Sheep.IsBaby());

            a_Pkt.WriteBEUInt8(12);  // Index 12: sheared, color
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BYTE);
            Int8 SheepMetadata = 0;
            SheepMetadata = static_cast<Int8>(Sheep.GetFurColor());
            if (Sheep.IsSheared())
            {
                SheepMetadata |= 0x10;
            }
            a_Pkt.WriteBEInt8(SheepMetadata);
            break;
        }  // case mtSheep

        case mtSkeleton:
        {
            auto & Skeleton = static_cast<const cSkeleton &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Type
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(Skeleton.IsWither() ? 1 : 0);
            break;
        }  // case mtSkeleton

        case mtSlime:
        {
            auto & Slime = static_cast<const cSlime &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Size
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Slime.GetSize()));
            break;
        }  // case mtSlime

        case mtVillager:
        {
            auto & Villager = static_cast<const cVillager &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Villager.IsBaby());

            a_Pkt.WriteBEUInt8(12);  // Index 12: Type
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Villager.GetVilType()));
            break;
        }  // case mtVillager

        case mtWitch:
        {
            auto & Witch = static_cast<const cWitch &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Is angry
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Witch.IsAngry());
            break;
        }  // case mtWitch

        case mtWither:
        {
            auto & Wither = static_cast<const cWither &>(a_Mob);
            a_Pkt.WriteBEUInt8(14);  // Index 14: Invulnerable ticks
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(Wither.GetWitherInvulnerableTicks());

            // TODO: Use boss bar packet for health
            break;
        }  // case mtWither

        case mtWolf:
        {
            auto & Wolf = static_cast<const cWolf &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Wolf.IsBaby());

            Int8 WolfStatus = 0;
            if (Wolf.IsSitting())
            {
                WolfStatus |= 0x1;
            }
            if (Wolf.IsAngry())
            {
                WolfStatus |= 0x2;
            }
            if (Wolf.IsTame())
            {
                WolfStatus |= 0x4;
            }
            a_Pkt.WriteBEUInt8(12);  // Index 12: status
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BYTE);
            a_Pkt.WriteBEInt8(WolfStatus);

            a_Pkt.WriteBEUInt8(14);  // Index 14: Health
            a_Pkt.WriteBEUInt8(METADATA_TYPE_FLOAT);
            a_Pkt.WriteBEFloat(static_cast<float>(a_Mob.GetHealth()));

            a_Pkt.WriteBEUInt8(15);  // Index 15: Is begging
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Wolf.IsBegging());

            a_Pkt.WriteBEUInt8(16);  // Index 16: Collar color
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(static_cast<UInt32>(Wolf.GetCollarColor()));
            break;
        }  // case mtWolf

        case mtZombie:
        {
            auto & Zombie = static_cast<const cZombie &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Zombie.IsBaby());

            a_Pkt.WriteBEUInt8(12);  // Index 12: Is a villager
            a_Pkt.WriteBEUInt8(METADATA_TYPE_VARINT);
            a_Pkt.WriteVarInt32(Zombie.IsVillagerZombie() ? 1 : 0);  // TODO: This actually encodes the zombie villager profession, but that isn't implemented yet.

            a_Pkt.WriteBEUInt8(13);  // Index 13: Is converting
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(Zombie.IsConverting());
            break;
        }  // case mtZombie

        case mtZombiePigman:
        {
            auto & ZombiePigman = static_cast<const cZombiePigman &>(a_Mob);
            a_Pkt.WriteBEUInt8(11);  // Index 11: Is baby
            a_Pkt.WriteBEUInt8(METADATA_TYPE_BOOL);
            a_Pkt.WriteBool(ZombiePigman.IsBaby());
            break;
        }  // case mtZombiePigman

        default: break;
    }  // switch (a_Mob.GetType())
}





void cProtocol_1_9_0::WriteEntityProperties(cPacketizer & a_Pkt, const cEntity & a_Entity)
{
    if (!a_Entity.IsMob())
    {
        // No properties for anything else than mobs
        a_Pkt.WriteBEInt32(0);
        return;
    }

    // const cMonster & Mob = (const cMonster &)a_Entity;

    // TODO: Send properties and modifiers based on the mob type

    a_Pkt.WriteBEInt32(0);  // NumProperties
}





// cProtocol_1_9_1:

cProtocol_1_9_1::cProtocol_1_9_1(cClientHandle * a_Client, const AString & a_ServerAddress, UInt16 a_ServerPort, UInt32 a_State) :
    Super(a_Client, a_ServerAddress, a_ServerPort, a_State)
{
}





void cProtocol_1_9_1::SendLogin(const cPlayer & a_Player, const cWorld & a_World)
{
    // Send the Join Game packet:
    {
        cServer * Server = cRoot::Get()->GetServer();
        cPacketizer Pkt(*this, pktJoinGame);
        Pkt.WriteBEUInt32(a_Player.GetUniqueID());
        Pkt.WriteBEUInt8(static_cast<UInt8>(a_Player.GetEffectiveGameMode()) | (Server->IsHardcore() ? 0x08 : 0));  // Hardcore flag bit 4
        Pkt.WriteBEInt32(static_cast<Int32>(a_World.GetDimension()));  // This is the change from 1.9.0 (Int8 to Int32)
        Pkt.WriteBEUInt8(2);  // TODO: Difficulty (set to Normal)
        Pkt.WriteBEUInt8(static_cast<UInt8>(Clamp<size_t>(Server->GetMaxPlayers(), 0, 255)));
        Pkt.WriteString("default");  // Level type - wtf?
        Pkt.WriteBool(false);  // Reduced Debug Info - wtf?
    }

    // Send the spawn position:
    {
        cPacketizer Pkt(*this, pktSpawnPosition);
        Pkt.WritePosition64(FloorC(a_World.GetSpawnX()), FloorC(a_World.GetSpawnY()), FloorC(a_World.GetSpawnZ()));
    }

    // Send the server difficulty:
    {
        cPacketizer Pkt(*this, pktDifficulty);
        Pkt.WriteBEInt8(1);
    }

    // Send player abilities:
    SendPlayerAbilities();
}





void cProtocol_1_9_1::HandlePacketStatusRequest(cByteBuffer & a_ByteBuffer)
{
    cServer * Server = cRoot::Get()->GetServer();
    AString ServerDescription = Server->GetDescription();
    auto NumPlayers = static_cast<signed>(Server->GetNumPlayers());
    auto MaxPlayers = static_cast<signed>(Server->GetMaxPlayers());
    AString Favicon = Server->GetFaviconData();
    cRoot::Get()->GetPluginManager()->CallHookServerPing(*m_Client, ServerDescription, NumPlayers, MaxPlayers, Favicon);

    // Version:
    Json::Value Version;
    Version["name"] = "Cuberite 1.9.1";
    Version["protocol"] = 108;

    // Players:
    Json::Value Players;
    Players["online"] = NumPlayers;
    Players["max"] = MaxPlayers;
    // TODO: Add "sample"

    // Description:
    Json::Value Description;
    Description["text"] = ServerDescription.c_str();

    // Create the response:
    Json::Value ResponseValue;
    ResponseValue["version"] = Version;
    ResponseValue["players"] = Players;
    ResponseValue["description"] = Description;
    m_Client->ForgeAugmentServerListPing(ResponseValue);
    if (!Favicon.empty())
    {
        ResponseValue["favicon"] = Printf("data:image/png;base64,%s", Favicon.c_str());
    }

    Json::FastWriter Writer;
    AString Response = Writer.write(ResponseValue);

    cPacketizer Pkt(*this, pktStatusResponse);
    Pkt.WriteString(Response);
}





// cProtocol_1_9_2:

cProtocol_1_9_2::cProtocol_1_9_2(cClientHandle * a_Client, const AString & a_ServerAddress, UInt16 a_ServerPort, UInt32 a_State) :
    Super(a_Client, a_ServerAddress, a_ServerPort, a_State)
{
}





void cProtocol_1_9_2::HandlePacketStatusRequest(cByteBuffer & a_ByteBuffer)
{
    cServer * Server = cRoot::Get()->GetServer();
    AString ServerDescription = Server->GetDescription();
    auto NumPlayers = static_cast<signed>(Server->GetNumPlayers());
    auto MaxPlayers = static_cast<signed>(Server->GetMaxPlayers());
    AString Favicon = Server->GetFaviconData();
    cRoot::Get()->GetPluginManager()->CallHookServerPing(*m_Client, ServerDescription, NumPlayers, MaxPlayers, Favicon);

    // Version:
    Json::Value Version;
    Version["name"] = "Cuberite 1.9.2";
    Version["protocol"] = 109;

    // Players:
    Json::Value Players;
    Players["online"] = NumPlayers;
    Players["max"] = MaxPlayers;
    // TODO: Add "sample"

    // Description:
    Json::Value Description;
    Description["text"] = ServerDescription.c_str();

    // Create the response:
    Json::Value ResponseValue;
    ResponseValue["version"] = Version;
    ResponseValue["players"] = Players;
    ResponseValue["description"] = Description;
    m_Client->ForgeAugmentServerListPing(ResponseValue);
    if (!Favicon.empty())
    {
        ResponseValue["favicon"] = Printf("data:image/png;base64,%s", Favicon.c_str());
    }

    Json::FastWriter Writer;
    AString Response = Writer.write(ResponseValue);

    cPacketizer Pkt(*this, pktStatusResponse);
    Pkt.WriteString(Response);
}





// cProtocol_1_9_4:

cProtocol_1_9_4::cProtocol_1_9_4(cClientHandle * a_Client, const AString & a_ServerAddress, UInt16 a_ServerPort, UInt32 a_State) :
    Super(a_Client, a_ServerAddress, a_ServerPort, a_State)
{
}





void cProtocol_1_9_4::HandlePacketStatusRequest(cByteBuffer & a_ByteBuffer)
{
    cServer * Server = cRoot::Get()->GetServer();
    AString ServerDescription = Server->GetDescription();
    auto NumPlayers = static_cast<signed>(Server->GetNumPlayers());
    auto MaxPlayers = static_cast<signed>(Server->GetMaxPlayers());
    AString Favicon = Server->GetFaviconData();
    cRoot::Get()->GetPluginManager()->CallHookServerPing(*m_Client, ServerDescription, NumPlayers, MaxPlayers, Favicon);

    // Version:
    Json::Value Version;
    Version["name"] = "Cuberite 1.9.4";
    Version["protocol"] = 110;

    // Players:
    Json::Value Players;
    Players["online"] = NumPlayers;
    Players["max"] = MaxPlayers;
    // TODO: Add "sample"

    // Description:
    Json::Value Description;
    Description["text"] = ServerDescription.c_str();

    // Create the response:
    Json::Value ResponseValue;
    ResponseValue["version"] = Version;
    ResponseValue["players"] = Players;
    ResponseValue["description"] = Description;
    m_Client->ForgeAugmentServerListPing(ResponseValue);
    if (!Favicon.empty())
    {
        ResponseValue["favicon"] = Printf("data:image/png;base64,%s", Favicon.c_str());
    }

    Json::FastWriter Writer;
    AString Response = Writer.write(ResponseValue);

    cPacketizer Pkt(*this, pktStatusResponse);
    Pkt.WriteString(Response);
}





void cProtocol_1_9_4::SendChunkData(int a_ChunkX, int a_ChunkZ, cChunkDataSerializer & a_Serializer)
{
    ASSERT(m_State == 3);  // In game mode?

    // Serialize first, before creating the Packetizer (the packetizer locks a CS)
    // This contains the flags and bitmasks, too
    const AString & ChunkData = a_Serializer.Serialize(cChunkDataSerializer::RELEASE_1_9_4, a_ChunkX, a_ChunkZ, {});

    cCSLock Lock(m_CSPacket);
    SendData(ChunkData.data(), ChunkData.size());
}





void cProtocol_1_9_4::SendUpdateSign(int a_BlockX, int a_BlockY, int a_BlockZ, const AString & a_Line1, const AString & a_Line2, const AString & a_Line3, const AString & a_Line4)
{
    ASSERT(m_State == 3);  // In game mode?

    // 1.9.4 removed the update sign packet and now uses Update Block Entity
    cPacketizer Pkt(*this, pktUpdateBlockEntity);
    Pkt.WritePosition64(a_BlockX, a_BlockY, a_BlockZ);
    Pkt.WriteBEUInt8(9);  // Action 9 - update sign

    cFastNBTWriter Writer;
    Writer.AddInt("x",        a_BlockX);
    Writer.AddInt("y",        a_BlockY);
    Writer.AddInt("z",        a_BlockZ);
    Writer.AddString("id", "Sign");

    Json::StyledWriter JsonWriter;
    Json::Value Line1;
    Line1["text"] = a_Line1;
    Writer.AddString("Text1", JsonWriter.write(Line1));
    Json::Value Line2;
    Line2["text"] = a_Line2;
    Writer.AddString("Text2", JsonWriter.write(Line2));
    Json::Value Line3;
    Line3["text"] = a_Line3;
    Writer.AddString("Text3", JsonWriter.write(Line3));
    Json::Value Line4;
    Line4["text"] = a_Line4;
    Writer.AddString("Text4", JsonWriter.write(Line4));

    Writer.Finish();
    Pkt.WriteBuf(Writer.GetResult().data(), Writer.GetResult().size());
}





UInt32 cProtocol_1_9_4::GetPacketID(cProtocol::ePacketType a_Packet)
{
    switch (a_Packet)
    {
        case pktCollectEntity:    return 0x48;
        case pktEntityEffect:     return 0x4b;
        case pktEntityProperties: return 0x4a;
        case pktPlayerMaxSpeed:   return 0x4a;
        case pktTeleportEntity:   return 0x49;

        default: return Super::GetPacketID(a_Packet);
    }
}