public static DataChunk mkDCOpen(string label)
{
DataChunk open = new DataChunk();
DCOpen dope = new DCOpen(label);
open.setData(dope.getBytes());
open._ppid = WEBRTCCONTROL;
open.setFlags(DataChunk.SINGLEFLAG);
return(open);
}
public DataChunk mkAck(DCOpen dcep)
{
DataChunk ack = new DataChunk();
ack.setData(dcep.mkAck());
ack._ppid = WEBRTCCONTROL;
ack.setFlags(DataChunk.SINGLEFLAG);
return(ack);
}
public DataChunk(CType type, byte flags, int length, ByteBuffer pkt) : base(type, flags, length, pkt)
{
Logger.Debug("read in chunk header " + length);
Logger.Debug("body remaining " + _body.remaining());
if (_body.remaining() >= 12)
{
_tsn = _body.GetUInt();
_streamId = _body.GetUShort();
_sSeqNo = _body.GetUShort();
_ppid = _body.GetInt();
Logger.Debug(" _tsn : " + _tsn
+ " _streamId : " + _streamId
+ " _sSeqNo : " + _sSeqNo
+ " _ppid : " + _ppid);
Logger.Debug("data size remaining " + _body.remaining());
switch (_ppid)
{
case WEBRTCCONTROL:
ByteBuffer bb = _body.slice();
try {
_open = new DCOpen(bb);
}
catch (InvalidDataChunkException ex) {
_invalid = ex;
}
Logger.Trace("Got an DCEP " + _open);
break;
case WEBRTCstring:
// what format is a string ?
_data = new byte[_body.remaining()];
_body.GetBytes(_data, _data.Length);
_dataOffset = 0;
_dataLength = _data.Length;
Logger.Trace("string data is " + Encoding.ASCII.GetString(_data));
break;
case WEBRTCBINARY:
_data = new byte[_body.remaining()];
_body.GetBytes(_data, _data.Length);
_dataOffset = 0;
_dataLength = _data.Length;
Logger.Trace("data is " + Packet.getHex(_data));
break;
default:
_invalid = new InvalidDataChunkException("Invalid Protocol Id in data Chunk " + _ppid);
break;
}
}
}
// todo should be in a behave block
// then we wouldn't be messing with stream seq numbers.
private Chunk[] dcepDeal(SCTPStream s, DataChunk dc, DCOpen dcep)
{
Chunk[] rep = null;
Logger.Debug("dealing with a decp for stream " + dc.getDataAsString());
if (!dcep.isAck())
{
Logger.Debug("decp is not an ack... ");
SCTPStreamBehaviour behave = dcep.mkStreamBehaviour();
s.setBehave(behave);
s.setLabel(dcep.getLabel());
lock (s) {
int seqIn = s.getNextMessageSeqIn();
s.setNextMessageSeqIn(seqIn + 1);
int seqOut = s.getNextMessageSeqOut();
s.setNextMessageSeqOut(seqOut + 1);
}
rep = new Chunk[1];
DataChunk ack = dc.mkAck(dcep);
s.outbound(ack);
ack.setTsn(_nearTSN++);
// check rollover - will break at maxint.
rep[0] = ack;
}
else
{
Logger.Debug("got a dcep ack for " + s.getLabel());
SCTPStreamBehaviour behave = dcep.mkStreamBehaviour();
s.setBehave(behave);
lock (s) {
int seqIn = s.getNextMessageSeqIn();
s.setNextMessageSeqIn(seqIn + 1);
int seqOut = s.getNextMessageSeqOut();
s.setNextMessageSeqOut(seqOut + 1);
}
}
return(rep);
}
