private IotDevice Decompress(CompressionBuffer buffer, IotDevice lastDevice)
{
try
{
var uptime = (lastDevice?.UptimeInSeconds ?? 0) + (ulong)(buffer.Decompress().Value * 100.0);
string message = lastDevice?.StatusMessage;
if (lastDevice == null || buffer.Decompress().Value < 0.1)
{
message = buffer.DecompressString();
}
return(new IotDevice(
lastDevice.Name,
lastDevice.Id,
message,
buffer.DecompressBoolean(),
buffer.DecompressBoolean(),
uptime,
new PhysicalValue(buffer.Decompress().Value * 5.0, "bar"),
new PhysicalValue(buffer.Decompress().Value * 100.0, "°C"),
new PhysicalValue(buffer.Decompress().Value * 1000.0, "m")));
}
catch (InvalidOperationException ioe)
{
if (_debug)
{
Console.WriteLine("Decompression Error" + ioe.ToString());
}
return(null);
}
}
private void Compress(CompressionBuffer buffer, IotDevice lastDevice, IotDevice device)
{
buffer.CompressAndFold(4 + ((lastDevice == null || lastDevice.StatusMessage == null || lastDevice.StatusMessage != device.StatusMessage) ? 10 : 0));
buffer.CompressAndFold(device.Pressure.Value, 5);
buffer.CompressAndFold(device.Temperature.Value, 100);
buffer.CompressAndFold(device.Distance.Value, 1000);
}
public byte[] Encode(IotDevice device)
{
var clone = _encodingBuffer.Clone();
Compress(_encodingBuffer, _lastEncodedDevice, device);
var x = Decompress(clone, _lastEncodedDevice);
_lastEncodedDevice = device;
// Wenn beim Komprimieren Rundungsfehler auftreten, dann nehmen wir einfach den Stateless Codec
if (x != null && IotDevice.AreEquals(device, x, _debug))
{
_encodingBuffer = clone;
return(new byte[0]);
}
else
{
var bytes = _encoder.Encode(device, sent ? _lastEncodedDevice : null);
sent = true;
return(bytes);
}
}
public EntropyMaximizingCodec(bool debug = false)
{
_debug = debug;
_encodingBuffer = new CompressionBuffer(debug);
_decodingBuffer = new CompressionBuffer(debug);
}