System.Security.Permissions.IsolatedStoragePermission.min C# (CSharp) Method

        internal static long min(long x,long y) {return x>y?y:x;}
        internal static long max(long x,long y) {return x<y?y:x;}

        public override IPermission Intersect(IPermission target)
        {
            if (target == null)
            {
                return(null);
            }
            if (!base.VerifyType(target))
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", new object[] { base.GetType().FullName }));
            }
            IsolatedStorageFilePermission permission = (IsolatedStorageFilePermission)target;

            if (permission.IsUnrestricted())
            {
                return(this.Copy());
            }
            if (base.IsUnrestricted())
            {
                return(target.Copy());
            }
            IsolatedStorageFilePermission permission2 = new IsolatedStorageFilePermission(PermissionState.None)
            {
                m_userQuota      = IsolatedStoragePermission.min(base.m_userQuota, permission.m_userQuota),
                m_machineQuota   = IsolatedStoragePermission.min(base.m_machineQuota, permission.m_machineQuota),
                m_expirationDays = IsolatedStoragePermission.min(base.m_expirationDays, permission.m_expirationDays),
                m_permanentData  = base.m_permanentData && permission.m_permanentData,
                m_allowed        = (IsolatedStorageContainment)((int)IsolatedStoragePermission.min((long)base.m_allowed, (long)permission.m_allowed))
            };

            if ((((permission2.m_userQuota == 0L) && (permission2.m_machineQuota == 0L)) && ((permission2.m_expirationDays == 0L) && !permission2.m_permanentData)) && (permission2.m_allowed == IsolatedStorageContainment.None))
            {
                return(null);
            }
            return(permission2);
        }