First iteration improved multiplatform support

Lidgren.Network/Platform/PlatformWin32.cs

@@ -0,0 +1,156 @@
+#if !__ANDROID__ && !__CONSTRAINED__ && !WINDOWS_RUNTIME
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Net;
+using System.Net.NetworkInformation;
+using System.Net.Sockets;
+using System.Security.Cryptography;
+
+namespace Lidgren.Network
+{
+	public static partial class NetUtility
+	{
+		private static readonly long s_timeInitialized = Stopwatch.GetTimestamp();
+		private static readonly double s_dInvFreq = 1.0 / (double)Stopwatch.Frequency;
+		
+		[CLSCompliant(false)]
+		public static ulong GetPlatformSeed(int seedInc)
+		{
+			ulong seed = (ulong)System.Diagnostics.Stopwatch.GetTimestamp();
+			return seed ^ ((ulong)Environment.WorkingSet + (ulong)seedInc);
+		}
+
+		public static double Now { get { return (double)(Stopwatch.GetTimestamp() - s_timeInitialized) * s_dInvFreq; } }
+
+		private static NetworkInterface GetNetworkInterface()
+		{
+			var computerProperties = IPGlobalProperties.GetIPGlobalProperties();
+			if (computerProperties == null)
+				return null;
+
+			var nics = NetworkInterface.GetAllNetworkInterfaces();
+			if (nics == null || nics.Length < 1)
+				return null;
+
+			NetworkInterface best = null;
+			foreach (NetworkInterface adapter in nics)
+			{
+				if (adapter.NetworkInterfaceType == NetworkInterfaceType.Loopback || adapter.NetworkInterfaceType == NetworkInterfaceType.Unknown)
+					continue;
+				if (!adapter.Supports(NetworkInterfaceComponent.IPv4))
+					continue;
+				if (best == null)
+					best = adapter;
+				if (adapter.OperationalStatus != OperationalStatus.Up)
+					continue;
+
+				// make sure this adapter has any ipv4 addresses
+				IPInterfaceProperties properties = adapter.GetIPProperties();
+				foreach (UnicastIPAddressInformation unicastAddress in properties.UnicastAddresses)
+				{
+					if (unicastAddress != null && unicastAddress.Address != null && unicastAddress.Address.AddressFamily == AddressFamily.InterNetwork)
+					{
+						// Yes it does, return this network interface.
+						return adapter;
+					}
+				}
+			}
+			return best;
+		}
+
+		/// <summary>
+		/// If available, returns the bytes of the physical (MAC) address for the first usable network interface
+		/// </summary>
+		public static byte[] GetMacAddressBytes()
+		{
+			var ni = GetNetworkInterface();
+			if (ni == null)
+				return null;
+			return ni.GetPhysicalAddress().GetAddressBytes();
+		}
+
+		public static IPAddress GetBroadcastAddress()
+		{
+			var ni = GetNetworkInterface();
+			if (ni == null)
+				return null;
+
+			var properties = ni.GetIPProperties();
+			foreach (UnicastIPAddressInformation unicastAddress in properties.UnicastAddresses)
+			{
+				if (unicastAddress != null && unicastAddress.Address != null && unicastAddress.Address.AddressFamily == AddressFamily.InterNetwork)
+				{
+					var mask = unicastAddress.IPv4Mask;
+					byte[] ipAdressBytes = unicastAddress.Address.GetAddressBytes();
+					byte[] subnetMaskBytes = mask.GetAddressBytes();
+
+					if (ipAdressBytes.Length != subnetMaskBytes.Length)
+						throw new ArgumentException("Lengths of IP address and subnet mask do not match.");
+
+					byte[] broadcastAddress = new byte[ipAdressBytes.Length];
+					for (int i = 0; i < broadcastAddress.Length; i++)
+					{
+						broadcastAddress[i] = (byte)(ipAdressBytes[i] | (subnetMaskBytes[i] ^ 255));
+					}
+					return new IPAddress(broadcastAddress);
+				}
+			}
+			return IPAddress.Broadcast;
+		}
+
+		/// <summary>
+		/// Gets my local IPv4 address (not necessarily external) and subnet mask
+		/// </summary>
+		public static IPAddress GetMyAddress(out IPAddress mask)
+		{
+			var ni = GetNetworkInterface();
+			if (ni == null)
+			{
+				mask = null;
+				return null;
+			}
+
+			IPInterfaceProperties properties = ni.GetIPProperties();
+			foreach (UnicastIPAddressInformation unicastAddress in properties.UnicastAddresses)
+			{
+				if (unicastAddress != null && unicastAddress.Address != null && unicastAddress.Address.AddressFamily == AddressFamily.InterNetwork)
+				{
+					mask = unicastAddress.IPv4Mask;
+					return unicastAddress.Address;
+				}
+			}
+
+			mask = null;
+			return null;
+		}
+
+		public static void Sleep(int milliseconds)
+		{
+			System.Threading.Thread.Sleep(milliseconds);
+		}
+
+		public static IPAddress CreateAddressFromBytes(byte[] bytes)
+		{
+			return new IPAddress(bytes);
+		}
+		
+		private static readonly SHA256 s_sha = SHA256.Create();
+		public static byte[] ComputeSHAHash(byte[] bytes, int offset, int count)
+		{
+			return s_sha.ComputeHash(bytes, offset, count);
+		}
+	}
+
+	public static partial class NetTime
+	{
+		private static readonly long s_timeInitialized = Stopwatch.GetTimestamp();
+		private static readonly double s_dInvFreq = 1.0 / (double)Stopwatch.Frequency;
+		
+		/// <summary>
+		/// Get number of seconds since the application started
+		/// </summary>
+		public static double Now { get { return (double)(Stopwatch.GetTimestamp() - s_timeInitialized) * s_dInvFreq; } }
+	}
+}
+#endif