static HaveNoneMessage()
{
Instance = new HaveNoneMessage();
}
/// <summary>
/// Parse the message from the buffer pool
/// </summary>
/// <param name="bufferPool">The buffer pool that saves the bytes from network</param>
/// <param name="booleansLength">The length of booleans</param>
/// <returns>Return the message that is parsed from the buffer pool</returns>
public static Message Parse(BufferPool bufferPool, int booleansLength)
{
Message result = null;
if (bufferPool.Length < 4)
{
return(null);
}
byte firstByte = bufferPool.GetFirstByte();
if (firstByte == 19)
{
if (bufferPool.Length >= 68)
{
byte[] buffer = new byte[68];
result = new HandshakeMessage();
bufferPool.Read(buffer, 0, 68);
result.Parse(buffer);
return(result);
}
return(null);
}
byte[] lengthBytes = new byte[4];
bufferPool.Read(lengthBytes, 0, 4);
int length = GetLength(lengthBytes, 0);
Debug.Assert(length >= 0);
if (length == 0)
{
result = new KeepAliveMessage();
return(result);
}
if (bufferPool.Length < length)
{
bufferPool.Seek(-4);
return(null);
}
byte[] contentBytes = new byte[length];
bufferPool.Read(contentBytes, 0, length);
switch ((MessageType)contentBytes[0])
{
case MessageType.Choke:
result = new ChokeMessage();
break;
case MessageType.Unchoke:
result = new UnchokeMessage();
break;
case MessageType.Interested:
result = new InterestedMessage();
break;
case MessageType.NotInterested:
result = new NotInterestedMessage();
break;
case MessageType.Have:
result = new HaveMessage();
break;
case MessageType.BitField:
result = new BitfieldMessage(booleansLength);
break;
case MessageType.Request:
result = new RequestMessage();
break;
case MessageType.Piece:
result = new PieceMessage();
break;
case MessageType.Cancel:
result = new CancelMessage();
break;
case MessageType.Port:
result = new PortMessage();
break;
case MessageType.SuggestPiece:
result = new SuggestPieceMessage();
break;
case MessageType.HaveAll:
result = new HaveAllMessage();
break;
case MessageType.HaveNone:
result = new HaveNoneMessage();
break;
case MessageType.RejectRequest:
result = new RejectRequestMessage();
break;
case MessageType.AllowedFast:
result = new AllowedFastMessage();
break;
case MessageType.ExtendedList:
result = new ExtendedListMessage();
break;
}
if (result != null)
{
result.Parse(contentBytes);
}
return(result);
}
