private async Task Socks5DataReceived(object Sender, P2P.SOCKS5.DataReceivedEventArgs e)
{
Socks5Receiver Rx = (Socks5Receiver)e.State;
if (HttpxChunks.chunkedStreams.TryGetValue(Rx.Key, out ChunkRecord Rec))
{
#if LOG_SOCKS5_EVENTS
this.client.Information(e.Count.ToString() + " bytes received over SOCKS5 stream " + Rx.Key + ".");
#endif
byte[] Buffer = e.Buffer;
int Offset = e.Offset;
int Count = e.Count;
int d;
while (Count > 0)
{
switch (Rx.State)
{
case 0:
Rx.BlockSize = Buffer[Offset++];
Count--;
Rx.State++;
break;
case 1:
Rx.BlockSize <<= 8;
Rx.BlockSize |= Buffer[Offset++];
Count--;
if (Rx.BlockSize == 0)
{
HttpxChunks.chunkedStreams.Remove(Rx.Key);
await Rec.ChunkReceived(Rx.Nr++, true, new byte[0]);
e.Stream.Dispose();
return;
}
Rx.BlockPos = 0;
if (Rx.Block is null || Rx.Block.Length != Rx.BlockSize)
{
Rx.Block = new byte[Rx.BlockSize];
}
Rx.State++;
break;
case 2:
d = Math.Min(Count, Rx.BlockSize - Rx.BlockPos);
Array.Copy(Buffer, Offset, Rx.Block, Rx.BlockPos, d);
Offset += d;
Rx.BlockPos += d;
Count -= d;
if (Rx.BlockPos >= Rx.BlockSize)
{
if (Rx.E2e)
{
string Id = Rec.NextId().ToString();
Rx.Block = this.e2e.Decrypt(Rx.EndpointReference, Id, Rx.StreamId, Rx.From, Rx.To, Rx.Block, Rx.SymmetricCipher);
if (Rx.Block is null)
{
string Message = "Decryption of chunk " + Rx.Nr.ToString() + " failed.";
#if LOG_SOCKS5_EVENTS
this.client.Error(Message);
#endif
await Rec.Fail(Message);
e.Stream.Dispose();
return;
}
}
#if LOG_SOCKS5_EVENTS
this.client.Information("Chunk " + Rx.Nr.ToString() + " received and forwarded.");
#endif
await Rec.ChunkReceived(Rx.Nr++, false, Rx.Block);
Rx.State = 0;
}
break;
}
}
}
else
{
#if LOG_SOCKS5_EVENTS
this.client.Warning(e.Count.ToString() + " bytes received over SOCKS5 stream " + Rx.Key + " and discarded.");
#endif
e.Stream.Dispose();
}
}