public static void UpdateAreaFromPacket(this ITerrain terrain, Packet packet)
{
var layerType = (LayerType)packet.ReadByte();
packet.ReadByte(); // materialType
packet.ReadByte(); // sizeOfElement;
var x1 = packet.ReadInt();
var y1 = packet.ReadInt();
var x2 = packet.ReadInt();
var y2 = packet.ReadInt();
var area = new Area(x1, y1, x2, y2);
var layer = terrain.GetLayerByType(layerType) as IUpdateableLayer;
layer?.CopyFromStreamToArea(packet, area);
}
public static Packet BuildLayerUpdatePacket(this ITerrain terrain, LayerType layerType, Area area)
{
var layer = terrain.GetLayerByType(layerType) as IUpdateableLayer;
if (layer == null)
{
return(null);
}
var packet = new Packet(ZoneCommand.LayerUpdate);
packet.AppendByte((byte)layerType);
packet.AppendByte(0); // material
packet.AppendByte((byte)layer.SizeInBytes);
packet.AppendInt(area.X1);
packet.AppendInt(area.Y1);
packet.AppendInt(area.X2);
packet.AppendInt(area.Y2);
var compressed = false;
var data = layer.CopyAreaToByteArray(area);
if (data.Length > GZIP_THRESHOLD)
{
var compressedData = GZip.Compress(data);
compressed = ((double)data.Length / compressedData.Length) > 1.0;
if (compressed)
{
data = compressedData;
}
}
packet.AppendByte((byte)(compressed ? 1 : 0));
packet.AppendInt(data.Length);
packet.AppendByteArray(data);
return(packet);
}
