public static SaiFrame Parse(byte[] bytes)
{
SaiFrame theFrame = null;
var theFrameType = (SaiFrameType)bytes[0];
if (theFrameType == SaiFrameType.TTS_OffsetStart)
{
theFrame = new SaiTtsFrameOffsetStart();
}
else if (theFrameType == SaiFrameType.TTS_OffsetAnswer1)
{
theFrame = new SaiTtsFrameOffsetAnswer1();
}
else if (theFrameType == SaiFrameType.TTS_OffsetAnswer2)
{
theFrame = new SaiTtsFrameOffsetAnswer2();
}
else if (theFrameType == SaiFrameType.TTS_OffsetEstimate)
{
theFrame = new SaiTtsFrameEstimate();
}
else if (theFrameType == SaiFrameType.TTS_OffsetEnd)
{
theFrame = new SaiTtsFrameOffsetEnd();
}
else if (theFrameType == SaiFrameType.TTS_AppData)
{
theFrame = new SaiTtsFrameAppData();
}
else if (theFrameType == SaiFrameType.EC_Start)
{
theFrame = new SaiEcFrameStart();
}
else if (theFrameType == SaiFrameType.EC_AppData)
{
theFrame = new SaiEcFrameApplication();
}
else if (theFrameType == SaiFrameType.EC_AppDataAskForAck)
{
theFrame = new SaiEcFrameAskForAck();
}
else if (theFrameType == SaiFrameType.EC_AppDataAcknowlegment)
{
theFrame = new SaiEcFrameAcknowlegment();
}
else
{
throw new InvalidOperationException(string.Format("无法解析指定的Sai帧，不可识别的类型{0}。", theFrameType));
}
theFrame.ParseBytes(bytes);
return(theFrame);
}
protected void SendEcStartFrame()
{
// 发送EC Start Frame.
var initValue = this.DefenseStrategy.GetLocalEcValue();
var ecInterval = this.Context.RsspEP.EcInterval;
var seqNo = (ushort)this.Context.SeqNoManager.GetAndUpdateSendSeq();
var frame = new SaiEcFrameStart(seqNo, initValue, 1, ecInterval);
var bytes = frame.GetBytes();
this.Context.NextLayer.SendUserData(bytes);
}
protected override void HandleEcStartFrame(SaiEcFrameStart frame)
{
// 主动方关闭EC Tsync.
this.Context.StopHandshakeTimer();
LogUtility.Info(string.Format("{0}: 主动方收到EcStart2，关闭Tsync。新状态：EcConnectedState",
this.Context.RsspEP.ID));
// 启动Remote EcCounter。
this.DefenseStrategy.StartRemoteCounter(this.Context.RsspEP.RemoteID, frame.Interval, frame.InitialValue);
// 设置下一状态为EcConnectedState
this.Context.CurrentState = new EcConnectedState(this);
//
this.Context.Connected = true;
}
public void Test1()
{
var frame1 = new SaiEcFrameStart();
frame1.SequenceNo = 200;
frame1.Version = 1;
frame1.InitialValue = 100;
frame1.Interval = 1000;
var bytes = frame1.GetBytes();
var frame2 = SaiFrame.Parse(bytes) as SaiEcFrameStart;
Assert.AreEqual(SaiFrameType.EC_Start, frame2.FrameType);
Assert.AreEqual(frame2.Version, frame1.Version);
Assert.AreEqual(frame2.SequenceNo, frame1.SequenceNo);
Assert.AreEqual(frame2.InitialValue, frame1.InitialValue);
Assert.AreEqual(frame2.Interval, frame1.Interval);
}
protected virtual void HandleEcStartFrame(SaiEcFrameStart ecStartFrame)
{
LogUtility.Error(string.Format("{0}: {1}.{2} not implement!",
this.Context.RsspEP.ID, this.GetType().Name,
new StackFrame(0).GetMethod().Name.Split('.').Last()));
}
