SocketAddressPal.cs

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using System.Buffers.Binary;
using System.Net.Sockets;
 
namespace System.Net;
 
internal static class SocketAddressPal
{
    public static AddressFamily GetAddressFamily(ReadOnlySpan<byte> buffer)
    {
        return (AddressFamily)BitConverter.ToInt16(buffer);
    }
 
    public static void SetAddressFamily(byte[] buffer, AddressFamily family)
    {
        if (family > (AddressFamily)65535)
        {
            throw new PlatformNotSupportedException();
        }
        BinaryPrimitives.WriteUInt16LittleEndian(buffer, (ushort)family);
    }
 
    public static void SetPort(byte[] buffer, ushort port)
    {
        BinaryPrimitives.WriteUInt16BigEndian(buffer.AsSpan(2), port);
    }
 
    public static uint GetIPv4Address(ReadOnlySpan<byte> buffer)
    {
        return BinaryPrimitives.ReadUInt32LittleEndian(buffer.Slice(4));
    }
 
    public static void GetIPv6Address(ReadOnlySpan<byte> buffer, Span<byte> address, out uint scope)
    {
        buffer.Slice(8, address.Length).CopyTo(address);
        scope = BinaryPrimitives.ReadUInt32LittleEndian(buffer.Slice(24));
    }
 
    public static void SetIPv4Address(byte[] buffer, uint address)
    {
        BinaryPrimitives.WriteUInt32LittleEndian(buffer.AsSpan(4), address);
    }
 
    public static void SetIPv6Address(byte[] buffer, Span<byte> address, uint scope)
    {
        BinaryPrimitives.WriteUInt32LittleEndian(buffer.AsSpan(4), 0u);
        BinaryPrimitives.WriteUInt32LittleEndian(buffer.AsSpan(24), scope);
        address.CopyTo(buffer.AsSpan(8));
    }
}