public static MinecraftPacket CreateClientPacket(MinecraftClient client, MemoryStream stream, ProtocolState state)
{
int id = -1;
if (client.EncryptionEnabled)
{
byte[] decrypted = client.Decryptor.ProcessBytes(stream.ToArray(), 0, (int)stream.Length);
stream.Position = 0;
stream.SetLength(0);
stream.Write(decrypted);
stream.Position = 0;
}
if (!client.CompressionEnabled)
{
VarInt varInt = new();
varInt.Read(stream);
varInt.Read(stream);
id = varInt.Value;
stream.Position = 0;
}
else
{
int packetLength = new VarInt(stream).Value;
long _pos = stream.Position;
int length = new VarInt(stream).Value;
if (length == 0) // packet is uncompressed
{
id = new VarInt(stream).Value;
byte[] data = new byte[packetLength - 1];
stream.Read(data, 0, data.Length);
stream.Position = 0;
stream.SetLength(0);
new VarInt(id).Write(stream);
stream.Write(data);
stream.Position = 0;
}
else
{
byte[] compressedData = new byte[packetLength - _pos];
stream.Read(compressedData, 0, compressedData.Length);
CompressionUtils.ZLibDecompress(compressedData, out byte[] data);
using (MemoryStream output = RMSManager.Get().GetStream(data)) {
_pos = output.Position;
id = new VarInt(output).Value;
}
stream.Position = 0;
stream.SetLength(0);
stream.Write(data);
stream.Position = 0;
}
}
Func <MinecraftClient, Stream, MinecraftPacket> ctor;
switch (state)
{
case ProtocolState.Handshaking:
ctor = clientPacketConstructors[0][id];
return(ctor?.Invoke(client, stream));
case ProtocolState.Status:
ctor = clientPacketConstructors[1][id];
return(ctor?.Invoke(client, stream));
case ProtocolState.Login:
ctor = clientPacketConstructors[2][id];
return(ctor?.Invoke(client, stream));
case ProtocolState.Play:
ctor = clientPacketConstructors[3][id];
return(ctor?.Invoke(client, stream));
}
return(null);
}