/// <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);
}