private void Process(byte b)
{
switch (_parseState)
{
case ParseState.Normal when b == IAC:
_parseState = ParseState.FoundIAC;
break;
case ParseState.Normal:
_memoryStream.WriteByte(b);
break;
case ParseState.FoundIAC when b == SB:
_parseState = ParseState.SBStart;
break;
case ParseState.FoundIAC when b == (byte)EnumIacVerbs.WILL:
case ParseState.FoundIAC when b == (byte)EnumIacVerbs.WONT:
case ParseState.FoundIAC when b == (byte)EnumIacVerbs.DO:
case ParseState.FoundIAC when b == (byte)EnumIacVerbs.DONT:
_currentVerb = (EnumIacVerbs)b;
_parseState = ParseState.IACCommand;
break;
case ParseState.FoundIAC when b == IAC:
// special escape sequence
_memoryStream.WriteByte(b);
break;
case ParseState.FoundIAC:
_parseState = ParseState.Normal;
break;
case ParseState.IACCommand:
IacVerbReceived?.Invoke(this, new IacVerbReceivedEventArgs()
{
Verb = _currentVerb,
Option = (EnumIacOptions)b
});
_parseState = ParseState.Normal;
break;
case ParseState.SBStart:
_sbValue.SetLength(0);
_currentSubnegotiationOption = (EnumIacOptions)b;
_parseState = ParseState.SBValue;
break;
case ParseState.SBValue when b == IAC:
_parseState = ParseState.SBIAC;
break;
case ParseState.SBValue:
_sbValue.WriteByte(b);
break;
case ParseState.SBIAC when b == SE:
IacSubnegotiationReceived?.Invoke(this, new IacSubnegotiationEventArgs()
{
Option = _currentSubnegotiationOption,
Data = _sbValue.ToArray()
});
_parseState = ParseState.Normal;
break;
case ParseState.SBIAC:
_sbValue.WriteByte(IAC);
_sbValue.WriteByte(b);
_parseState = ParseState.SBValue;
break;
}
}
public IacResponse(EnumIacVerbs verb, EnumIacOptions option)
{
Verb = verb;
Option = option;
}
