/// <summary>Gets the host identifier (rest) an <see cref="T:System.Net.IPAddress"/>.</summary>
/// <param name="address">The address</param>
/// <param name="mask">The net mask of the network</param>
/// <returns>The host identifier (rest) an <see cref="T:System.Net.IPAddress"/></returns>
public static IPAddress GetHostIdentifier(this IPAddress address, NetMask mask)
{
if (address == null)
{
throw new ArgumentNullException(nameof(address));
}
if (mask == null)
{
throw new ArgumentNullException(nameof(mask));
}
if (address.AddressFamily != Sockets.AddressFamily.InterNetwork)
{
throw new NotSupportedException(OnlyIPv4Supported);
}
var maskBits = mask.GetMaskBytes();
var ipBits = address.GetAddressBytes();
// ~Mask & IP
var retVal = maskBits.Not().And(ipBits);
var bytes = new byte[NetMask.MaskLength];
Buffer.BlockCopy(retVal, 0, bytes, 0, bytes.Length);
return(new IPAddress(bytes));
}
/// <summary>Gets the broadcast address of an <see cref="T:System.Net.IPAddress"/>.</summary>
/// <param name="address">The address</param>
/// <param name="mask">The net mask of the network</param>
/// <returns>The broadcast address of an <see cref="T:System.Net.IPAddress"/></returns>
public static IPAddress GetBroadcastAddress(this IPAddress address, NetMask mask)
{
if (address == null)
{
throw new ArgumentNullException("address");
}
if (mask == null)
{
throw new ArgumentNullException("mask");
}
if (address.AddressFamily != Sockets.AddressFamily.InterNetwork)
{
throw new NotSupportedException(OnlyIPv4Supported);
}
// TODO: Test
var ipBytes = address.GetAddressBytes();
var notMaskBytes = mask.GetMaskBytes().Not();
var broadcastAddressBytes = notMaskBytes.Or(ipBytes);
return(new IPAddress(broadcastAddressBytes));
}