/// <summary>
///
/// </summary>
/// <param name="frameId"></param>
/// <param name="prevFrameId"></param>
/// <param name="snapshot"></param>
/// <returns></returns>
public byte[] Decompress(uint prevFrameId, byte[] snapshot)
{
#if DONT_USE_DELTA
return(NetworkEngine.Decompress(snapshot));
#endif
if (prevFrameId == 0)
{
return(NetDeflate.Decompress(snapshot));
}
var prevSnapshot = queue.SingleOrDefault(s => s.Frame == prevFrameId);
if (prevSnapshot == null)
{
Log.Warning("Missing snapshot #{0}. Waiting for full snapshot.", prevFrameId);
return(null);
}
var delta = NetDeflate.Decompress(snapshot);
var minSize = Math.Min(delta.Length, prevSnapshot.Data.Length);
var newSnapshot = new byte[delta.Length];
for (int i = 0; i < minSize; i++)
{
newSnapshot[i] = (byte)(delta[i] ^ prevSnapshot.Data[i]);
}
if (delta.Length > prevSnapshot.Data.Length)
{
for (int i = minSize; i < delta.Length; i++)
{
newSnapshot[i] = delta[i];
}
}
return(newSnapshot);
}
/// <summary>
///
/// </summary>
/// <param name="prevFrame"></param>
/// <returns></returns>
public byte[] Compress(ref uint prevFrame, out int size)
{
#if DONT_USE_DELTA
size = queue.Last().Data.Length;
return(NetworkEngine.Compress(queue.Last().Data));
#endif
var lastSnapshot = queue.Last();
size = lastSnapshot.Data.Length;
var prevFrameLocal = prevFrame;
var prevSnapshot = queue.SingleOrDefault(s => s.Frame == prevFrameLocal);
if (prevSnapshot == null)
{
prevFrame = 0;
return(NetDeflate.Compress(lastSnapshot.Data));
}
var delta = new byte[lastSnapshot.Data.Length];
var minSize = Math.Min(delta.Length, prevSnapshot.Data.Length);
for (int i = 0; i < minSize; i++)
{
delta[i] = (byte)(lastSnapshot.Data[i] ^ prevSnapshot.Data[i]);
}
if (delta.Length > prevSnapshot.Data.Length)
{
for (int i = minSize; i < delta.Length; i++)
{
delta[i] = lastSnapshot.Data[i];
}
}
return(NetDeflate.Compress(delta));
}
public override void DataReceived(NetCommand command, NetIncomingMessage msg)
{
if (command == NetCommand.Snapshot)
{
var frame = msg.ReadUInt32();
var prevFrame = msg.ReadUInt32();
var ackCmdID = msg.ReadUInt32();
var serverTicks = msg.ReadInt64();
var size = msg.ReadInt32();
//Log.Warning("{0}", offsetTicks );
if (prevFrame != 0)
{
Log.Warning("Bad initial snapshot. Previous frame does not equal zero.");
return;
}
if (ackCmdID != 0)
{
Log.Warning("Bad command ID {0}. Command ID for initial snapshot must be zero.", ackCmdID);
return;
}
// read snapshot :
var snapshot = NetDeflate.Decompress(msg.ReadBytes(size));
// initial snapshot contains atom table :
context.Instance.FeedAtoms(new AtomCollection(msg));
gameClient.SetState(new Active(context, frame, snapshot, serverTicks));
}
if (command == NetCommand.Notification)
{
context.Instance.FeedNotification(msg.ReadString());
}
}
