CustomAce.cs

using System.Globalization;

namespace System.Security.AccessControl
{
    public sealed class CustomAce : GenericAce
    {
        private byte[] _opaque;

        public static readonly int MaxOpaqueLength = 65531;

        public int OpaqueLength
        {
            get
            {
                if (_opaque == null)
                {
                    return 0;
                }
                return _opaque.Length;
            }
        }

        public override int BinaryLength => 4 + OpaqueLength;

        public CustomAce(AceType type, AceFlags flags, byte[] opaque)
            : base(type, flags)
        {
            if ((int)type <= 16)
            {
                throw new ArgumentOutOfRangeException("type", Environment.GetResourceString("ArgumentOutOfRange_InvalidUserDefinedAceType"));
            }
            SetOpaque(opaque);
        }

        public byte[] GetOpaque()
        {
            return _opaque;
        }

        public void SetOpaque(byte[] opaque)
        {
            if (opaque != null)
            {
                if (opaque.Length > MaxOpaqueLength)
                {
                    throw new ArgumentOutOfRangeException("opaque", string.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_ArrayLength"), 0, MaxOpaqueLength));
                }
                if (opaque.Length % 4 != 0)
                {
                    throw new ArgumentOutOfRangeException("opaque", string.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_ArrayLengthMultiple"), 4));
                }
            }
            _opaque = opaque;
        }

        public override void GetBinaryForm(byte[] binaryForm, int offset)
        {
            MarshalHeader(binaryForm, offset);
            offset += 4;
            if (OpaqueLength != 0)
            {
                if (OpaqueLength > MaxOpaqueLength)
                {
                    throw new SystemException();
                }
                GetOpaque().CopyTo(binaryForm, offset);
            }
        }
    }
}