/// <summary>
/// Reads the next string
/// </summary>
/// <param name="bytes"></param>
/// <returns></returns>
public static string GetString(List <byte> bytes)
{
int strLen = VarInt.ReadNext(bytes);
var strRaw = bytes.Read(strLen);
return(Encoding.UTF8.GetString(strRaw.ToArray()));
}
public void Read(List <byte> buffer)
{
int paletteLength = VarInt.ReadNext(buffer);
for (int i = 0; i < paletteLength; i++)
{
uint blockState = (uint)VarInt.ReadNext(buffer);
_blockStates.Add((uint)i, blockState);
}
}
/// <summary>
/// Populates this chunk with data from a <see cref="ChunkDataPacket"/>
/// </summary>
/// <param name="packet"></param>
public void AddChunkData(ChunkDataPacket packet)
{
//check if data applies to this chunk
if (!packet.Position.Equals(Position))
{
Debug.LogWarning($"Chunk at {Position} tried to add data for chunk at {packet.Position}??");
return;
}
// lock block array to stop block changes from happening
var data = new List<byte>(packet.Data);
Profiler.BeginSample("Loading chunk sections");
// chunk data
for (int s = 0; s < 16; s++)
{
// check bitmask to see if we're reading data for this section
if ((packet.PrimaryBitmask & (1) << s) != 0)
{
Profiler.BeginSample($"Chunk section: {s}");
// set max block height to the height of this chunk
int maxBlockHeight = (s + 1) * 16;
if (maxBlockHeight > MaxHeight)
MaxHeight = maxBlockHeight;
// read bits per block
byte bitsPerBlock = data.Read(1)[0];
if (bitsPerBlock < 4)
bitsPerBlock = 4;
// choose palette type
IChunkPalette palette;
if (bitsPerBlock <= 8)
palette = new IndirectChunkPalette();
else
palette = new DirectChunkPalette();
palette.Read(data); // read palette data, bringing chunk data into front of buffer
// bitmask that contains bitsperblock set bits
uint individualValueMask = (uint)((1 << bitsPerBlock) - 1);
// read data into array of longs
int dataArrayLength = VarInt.ReadNext(data);
ulong[] dataArray = new ulong[dataArrayLength];
for (int i = 0; i < dataArrayLength; i++)
{
dataArray[i] = PacketHelper.GetUInt64(data);
}
Profiler.BeginSample("Block data");
// parse block data
for (int b = 0; b < 4096; b++) // for section height
{
int startLong = (b * bitsPerBlock) / 64;
int startOffset = (b * bitsPerBlock) % 64;
int endLong = ((b + 1) * bitsPerBlock - 1) / 64;
uint blockData;
if (startLong == endLong)
{
blockData = (uint)(dataArray[startLong] >> startOffset);
}
else
{
int endOffset = 64 - startOffset;
blockData = (uint)(dataArray[startLong] >> startOffset | dataArray[endLong] << endOffset);
}
blockData &= individualValueMask;
uint blockState = palette.GetBlockState(blockData);
BlockState blk = new BlockState((BlockType)blockState);
// add block to block array
BlockArray[b + (4096 * s)] = blk;
}
Profiler.EndSample(); // block data
// we don't use sky or block lights
// read data to move new data to front of buffer
data.Read(2048);
if (World.Dimension == World.DimensionType.OVERWORLD)
data.Read(2048);
/*
Profiler.BeginSample("Block lights");
// parse block light data
for (int y = 0; y < 16; y++)
{
for (int z = 0; z < 16; z++)
{
for (int x = 0; x < 16; x += 2)
{
// light data takes 4 bits. because of this, we read two light values per byte
byte value = data.Read(1)[0];
_blockLights[x, y + (16 * s), z] = value & 0xf;
_blockLights[x + 1, y + (16 * s), z] = (value >> 4) & 0xf;
}
}
}
Profiler.EndSample(); // block lights
// parse sky lights
if (World.Dimension == World.DimensionType.OVERWORLD)
{
Profiler.BeginSample("Sky lights");
// parse block light data
for (int y = 0; y < 16; y++)
{
for (int z = 0; z < 16; z++)
{
for (int x = 0; x < 16; x += 2)
{
// light data takes 4 bits. because of this, we read two light values per byte
byte value = data.Read(1)[0];
_skylights[x, y + (16 * s), z] = value & 0xf;
_skylights[x + 1, y + (16 * s), z] = (value >> 4) & 0xf;
}
}
}
Profiler.EndSample(); // sky lights
}
*/
Profiler.EndSample(); // chunk section
}
else
{
// fill chunk section with air if full chunk
if (packet.GroundUpContinuous)
{
for (int i = 0; i < 4096; i++)
{
BlockArray[s + (4096 * s)] = new BlockState(BlockType.AIR);
}
}
}
// parse biomes
if (packet.GroundUpContinuous)
{
//throw new NotImplementedException();
}
}
}
/// <summary>
/// Gets the next packet from the server
/// </summary>
/// <returns></returns>
public PacketData ReadNextPacket()
{
int packetId;
byte[] payload;
lock (_streamReadLock)
{
int length = VarInt.ReadNext(ReadBytes);
List <byte> buffer = new List <byte>();
// check if data is compressed
if (_compressionThreshold >= 0)
{
int dataLength = VarInt.ReadNext(ReadBytes);
length -= VarInt.GetBytes(dataLength).Length; // remove size of data length from rest of packet length
if (dataLength != 0)
{
byte[] compressedBuffer = ReadBytes(length);
buffer.AddRange(ZlibStream.UncompressBuffer(compressedBuffer));
}
else
{
buffer.AddRange(ReadBytes(length));
}
}
else
{
buffer.AddRange(ReadBytes(length));
}
packetId = VarInt.ReadNext(buffer);
payload = buffer.ToArray();
}
// handles some stuff during login phase
if (State == ProtocolState.LOGIN)
{
// handle compression packet
if (packetId == (int)ClientboundIDs.LogIn_SetCompression)
{
_compressionThreshold = VarInt.ReadNext(new List <byte>(payload));
return(ReadNextPacket());
}
// handle protocol encryption packet
if (packetId == (int)ClientboundIDs.LogIn_EncryptionRequest)
{
var encRequestPkt = new EncryptionRequestPacket()
{
Payload = payload
};
var aesSecret = CryptoHandler.GenerateSharedSecret();
var authHash = CryptoHandler.SHAHash(Encoding.ASCII.GetBytes(encRequestPkt.ServerID).Concat(aesSecret, encRequestPkt.PublicKey));
Debug.Log($"Sending hash to Mojang servers: {authHash}");
// check session with mojang
if (!MojangAPI.JoinServer(authHash))
{
throw new UnityException("Invalid session. (Try restarting game or relogging into Minecraft account)");
}
// use pub key to encrypt shared secret
using (var rsaProvider = CryptoHandler.DecodeRSAPublicKey(encRequestPkt.PublicKey))
{
byte[] encSecret = rsaProvider.Encrypt(aesSecret, false);
byte[] encToken = rsaProvider.Encrypt(encRequestPkt.VerifyToken, false);
// respond to server with private key
var responsePkt = new EncryptionResponsePacket()
{
SharedSecret = encSecret,
VerifyToken = encToken
};
WritePacket(responsePkt);
// enable aes encryption
_aesStream = new AesStream(Client.GetStream(), aesSecret);
_encrypted = true;
// read the next packet
return(ReadNextPacket());
}
}
}
return(new PacketData
{
ID = packetId,
Payload = payload
});
}
