IsolatedStorageFilePermission.cs

using System.Runtime.InteropServices;

namespace System.Security.Permissions
{
    [Serializable]
    [ComVisible(true)]
    public sealed class IsolatedStorageFilePermission : IsolatedStoragePermission, IBuiltInPermission
    {
        public IsolatedStorageFilePermission(PermissionState state)
            : base(state)
        {
        }

        internal IsolatedStorageFilePermission(IsolatedStorageContainment UsageAllowed, long ExpirationDays, bool PermanentData)
            : base(UsageAllowed, ExpirationDays, PermanentData)
        {
        }

        public override IPermission Union(IPermission target)
        {
            if (target == null)
            {
                return Copy();
            }
            if (!VerifyType(target))
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", GetType().FullName));
            }
            IsolatedStorageFilePermission isolatedStorageFilePermission = (IsolatedStorageFilePermission)target;
            if (IsUnrestricted() || isolatedStorageFilePermission.IsUnrestricted())
            {
                return new IsolatedStorageFilePermission(PermissionState.Unrestricted);
            }
            IsolatedStorageFilePermission isolatedStorageFilePermission2 = new IsolatedStorageFilePermission(PermissionState.None);
            isolatedStorageFilePermission2.m_userQuota = IsolatedStoragePermission.max(m_userQuota, isolatedStorageFilePermission.m_userQuota);
            isolatedStorageFilePermission2.m_machineQuota = IsolatedStoragePermission.max(m_machineQuota, isolatedStorageFilePermission.m_machineQuota);
            isolatedStorageFilePermission2.m_expirationDays = IsolatedStoragePermission.max(m_expirationDays, isolatedStorageFilePermission.m_expirationDays);
            isolatedStorageFilePermission2.m_permanentData = (m_permanentData || isolatedStorageFilePermission.m_permanentData);
            isolatedStorageFilePermission2.m_allowed = (IsolatedStorageContainment)IsolatedStoragePermission.max((long)m_allowed, (long)isolatedStorageFilePermission.m_allowed);
            return isolatedStorageFilePermission2;
        }

        public override bool IsSubsetOf(IPermission target)
        {
            if (target == null)
            {
                if (m_userQuota == 0L && m_machineQuota == 0L && m_expirationDays == 0L && !m_permanentData)
                {
                    return m_allowed == IsolatedStorageContainment.None;
                }
                return false;
            }
            try
            {
                IsolatedStorageFilePermission isolatedStorageFilePermission = (IsolatedStorageFilePermission)target;
                if (isolatedStorageFilePermission.IsUnrestricted())
                {
                    return true;
                }
                return isolatedStorageFilePermission.m_userQuota >= m_userQuota && isolatedStorageFilePermission.m_machineQuota >= m_machineQuota && isolatedStorageFilePermission.m_expirationDays >= m_expirationDays && (isolatedStorageFilePermission.m_permanentData || !m_permanentData) && isolatedStorageFilePermission.m_allowed >= m_allowed;
            }
            catch (InvalidCastException)
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", GetType().FullName));
            }
        }

        public override IPermission Intersect(IPermission target)
        {
            if (target == null)
            {
                return null;
            }
            if (!VerifyType(target))
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", GetType().FullName));
            }
            IsolatedStorageFilePermission isolatedStorageFilePermission = (IsolatedStorageFilePermission)target;
            if (isolatedStorageFilePermission.IsUnrestricted())
            {
                return Copy();
            }
            if (IsUnrestricted())
            {
                return target.Copy();
            }
            IsolatedStorageFilePermission isolatedStorageFilePermission2 = new IsolatedStorageFilePermission(PermissionState.None);
            isolatedStorageFilePermission2.m_userQuota = IsolatedStoragePermission.min(m_userQuota, isolatedStorageFilePermission.m_userQuota);
            isolatedStorageFilePermission2.m_machineQuota = IsolatedStoragePermission.min(m_machineQuota, isolatedStorageFilePermission.m_machineQuota);
            isolatedStorageFilePermission2.m_expirationDays = IsolatedStoragePermission.min(m_expirationDays, isolatedStorageFilePermission.m_expirationDays);
            isolatedStorageFilePermission2.m_permanentData = (m_permanentData && isolatedStorageFilePermission.m_permanentData);
            isolatedStorageFilePermission2.m_allowed = (IsolatedStorageContainment)IsolatedStoragePermission.min((long)m_allowed, (long)isolatedStorageFilePermission.m_allowed);
            if (isolatedStorageFilePermission2.m_userQuota == 0L && isolatedStorageFilePermission2.m_machineQuota == 0L && isolatedStorageFilePermission2.m_expirationDays == 0L && !isolatedStorageFilePermission2.m_permanentData && isolatedStorageFilePermission2.m_allowed == IsolatedStorageContainment.None)
            {
                return null;
            }
            return isolatedStorageFilePermission2;
        }

        public override IPermission Copy()
        {
            IsolatedStorageFilePermission isolatedStorageFilePermission = new IsolatedStorageFilePermission(PermissionState.Unrestricted);
            if (!IsUnrestricted())
            {
                isolatedStorageFilePermission.m_userQuota = m_userQuota;
                isolatedStorageFilePermission.m_machineQuota = m_machineQuota;
                isolatedStorageFilePermission.m_expirationDays = m_expirationDays;
                isolatedStorageFilePermission.m_permanentData = m_permanentData;
                isolatedStorageFilePermission.m_allowed = m_allowed;
            }
            return isolatedStorageFilePermission;
        }

        int IBuiltInPermission.GetTokenIndex()
        {
            return GetTokenIndex();
        }

        internal static int GetTokenIndex()
        {
            return 3;
        }

        [ComVisible(false)]
        public override SecurityElement ToXml()
        {
            return ToXml("System.Security.Permissions.IsolatedStorageFilePermission");
        }
    }
}