UnicastIPAddressInformation.cs

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using System.Net.Sockets;
 
namespace System.Net.NetworkInformation;
 
public abstract class UnicastIPAddressInformation : IPAddressInformation
{
    public abstract long AddressPreferredLifetime { get; }
 
    public abstract long AddressValidLifetime { get; }
 
    public abstract long DhcpLeaseLifetime { get; }
 
    public abstract DuplicateAddressDetectionState DuplicateAddressDetectionState { get; }
 
    public abstract PrefixOrigin PrefixOrigin { get; }
 
    public abstract SuffixOrigin SuffixOrigin { get; }
 
    public abstract IPAddress IPv4Mask { get; }
 
    public virtual int PrefixLength
    {
        get
        {
            throw System.NotImplemented.ByDesignWithMessage(System.SR.net_PropertyNotImplementedException);
        }
    }
 
    internal static IPAddress PrefixLengthToSubnetMask(byte prefixLength, AddressFamily family)
    {
        Span<byte> span = ((family != AddressFamily.InterNetwork) ? stackalloc byte[16] : stackalloc byte[4]);
        Span<byte> span2 = span;
        span2.Clear();
        for (int i = 0; i < prefixLength; i++)
        {
            span2[i / 8] |= (byte)(128 >> i % 8);
        }
        return new IPAddress(span2);
    }
}