IsolatedStorageFilePermission.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Permissions / IsolatedStorageFilePermission.cs / 1 / IsolatedStorageFilePermission.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//
// Purpose : This permission is used to controls/administer access to 
//  IsolatedStorageFile 
//
 
namespace System.Security.Permissions {

    using System.Globalization;
 
    [Serializable]
[System.Runtime.InteropServices.ComVisible(true)] 
    sealed public class IsolatedStorageFilePermission : IsolatedStoragePermission, IBuiltInPermission 
    {
        public IsolatedStorageFilePermission(PermissionState state) 
        : base(state) { }

        internal IsolatedStorageFilePermission(IsolatedStorageContainment UsageAllowed,
            long ExpirationDays, bool PermanentData) 
        : base(UsageAllowed, ExpirationDays, PermanentData) { }
 
        //------------------------------------------------------ 
        //
        // IPERMISSION IMPLEMENTATION 
        //
        //-----------------------------------------------------

        public override IPermission Union(IPermission target) 
        {
            if (target == null) 
            { 
                return this.Copy();
            } 
            else if (!VerifyType(target))
            {
                throw new
                    ArgumentException( 
                                    String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName)
                                     ); 
            } 

            IsolatedStorageFilePermission operand = (IsolatedStorageFilePermission)target; 

            if (this.IsUnrestricted() || operand.IsUnrestricted())
            {
                return new IsolatedStorageFilePermission( PermissionState.Unrestricted ); 
            }
            else 
            { 
                IsolatedStorageFilePermission union;
                union = new IsolatedStorageFilePermission( PermissionState.None ); 
                union.m_userQuota = max(m_userQuota,operand.m_userQuota);
                union.m_machineQuota = max(m_machineQuota,operand.m_machineQuota);
                union.m_expirationDays = max(m_expirationDays,operand.m_expirationDays);
                union.m_permanentData = m_permanentData || operand.m_permanentData; 
                union.m_allowed = (IsolatedStorageContainment)max((long)m_allowed,(long)operand.m_allowed);
                return union; 
            } 
        }
 
        public override bool IsSubsetOf(IPermission target)
        {
            if (target == null)
            { 
                return ((m_userQuota == 0) &&
                        (m_machineQuota == 0) && 
                        (m_expirationDays == 0) && 
                        (m_permanentData == false) &&
                        (m_allowed == IsolatedStorageContainment.None)); 
            }

            try
            { 
                IsolatedStorageFilePermission operand = (IsolatedStorageFilePermission)target;
 
                if (operand.IsUnrestricted()) 
                    return true;
 
                return ((operand.m_userQuota >= m_userQuota) &&
                        (operand.m_machineQuota >= m_machineQuota) &&
                        (operand.m_expirationDays >= m_expirationDays) &&
                        (operand.m_permanentData || !m_permanentData) && 
                        (operand.m_allowed >= m_allowed));
            } 
            catch (InvalidCastException) 
            {
                throw new 
                    ArgumentException(
                                    String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName)
                                     );
            } 

        } 
 
        public override IPermission Intersect(IPermission target)
        { 
            if (target == null)
                return null;
            else if (!VerifyType(target))
            { 
                throw new
                    ArgumentException( 
                                    String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName) 
                                     );
            } 

            IsolatedStorageFilePermission operand = (IsolatedStorageFilePermission)target;

            if(operand.IsUnrestricted()) 
                return Copy();
            else if(IsUnrestricted()) 
                return target.Copy(); 

            IsolatedStorageFilePermission intersection; 
            intersection = new IsolatedStorageFilePermission( PermissionState.None );
            intersection.m_userQuota = min(m_userQuota,operand.m_userQuota);
            intersection.m_machineQuota = min(m_machineQuota,operand.m_machineQuota);
            intersection.m_expirationDays = min(m_expirationDays,operand.m_expirationDays); 
            intersection.m_permanentData = m_permanentData && operand.m_permanentData;
            intersection.m_allowed = (IsolatedStorageContainment)min((long)m_allowed,(long)operand.m_allowed); 
 
            if ((intersection.m_userQuota == 0) &&
            (intersection.m_machineQuota == 0) && 
            (intersection.m_expirationDays == 0) &&
            (intersection.m_permanentData == false) &&
            (intersection.m_allowed == IsolatedStorageContainment.None))
                return null; 

            return intersection; 
        } 

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

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

        internal static int GetTokenIndex()
        { 
            return BuiltInPermissionIndex.IsolatedStorageFilePermissionIndex;
        } 
 
        //-----------------------------------------------------
        // 
        // IsolatedStoragePermission OVERRIDES
        //
        //-----------------------------------------------------
 
        [System.Runtime.InteropServices.ComVisible(false)]
        public override SecurityElement ToXml() 
        { 
            return base.ToXml( "System.Security.Permissions.IsolatedStorageFilePermission" );
        } 
    }
}

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