Added IPAddress.Increment/Decrement; Added ParseNetwork, ExpandNetwork

AMWD.Common/Extensions/IPAddressExtensions.cs

@@ -0,0 +1,46 @@
+namespace System.Net
+{
+	/// <summary>
+	/// Provides extension methods for <see cref="IPAddress"/>es.
+	/// </summary>
+	public static class IPAddressExtensions
+	{
+		/// <summary>
+		/// Increments the <see cref="IPAddress"/> by one and returns a new instance.
+		/// </summary>
+		/// <param name="address">The <see cref="IPAddress"/> to increment.</param>
+		public static IPAddress Increment(this IPAddress address)
+		{
+			byte[] bytes = address.GetAddressBytes();
+			int bytePos = bytes.Length - 1;
+
+			while (bytes[bytePos] == byte.MaxValue)
+			{
+				bytes[bytePos] = 0;
+				bytePos--;
+			}
+			bytes[bytePos]++;
+
+			return new IPAddress(bytes);
+		}
+
+		/// <summary>
+		/// Decrements the <see cref="IPAddress"/> by one and returns a new instance.
+		/// </summary>
+		/// <param name="address">The <see cref="IPAddress"/> to decrement.</param>
+		public static IPAddress Decrement(this IPAddress address)
+		{
+			byte[] bytes = address.GetAddressBytes();
+			int bytePos = bytes.Length - 1;
+
+			while (bytes[bytePos] == 0)
+			{
+				bytes[bytePos] = byte.MaxValue;
+				bytePos--;
+			}
+			bytes[bytePos]--;
+
+			return new IPAddress(bytes);
+		}
+	}
+}