class/corlib/System.Security.Permissions/IsolatedStorageFilePermission.cs

   1 //
   2 // System.Security.Permissions.IsolatedStorageFilePermission.cs
   3 //
   4 // Author
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2003 Motus Technologies. http://www.motus.com
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Runtime.InteropServices;
  31
  32 namespace System.Security.Permissions {
  33
  34         [Serializable]
  35         [ComVisible (true)]
  36         public sealed class IsolatedStorageFilePermission : IsolatedStoragePermission, IBuiltInPermission {
  37
  38                 // Constructors
  39
  40                 public IsolatedStorageFilePermission (PermissionState state)
  41                         : base (state)
  42                 {
  43                 }
  44
  45                 // Properties
  46
  47                 // Methods
  48
  49                 public override IPermission Copy ()
  50                 {
  51                         IsolatedStorageFilePermission p = new IsolatedStorageFilePermission (PermissionState.None);
  52                         p.m_userQuota = m_userQuota;
  53                         p.m_machineQuota = m_machineQuota;
  54                         p.m_expirationDays = m_expirationDays;
  55                         p.m_permanentData = m_permanentData;
  56                         p.m_allowed = m_allowed;
  57                         return p;
  58                 }
  59
  60                 public override IPermission Intersect (IPermission target)
  61                 {
  62                         IsolatedStorageFilePermission isfp = Cast (target);
  63                         if (isfp == null)
  64                                 return null;
  65                         if (IsEmpty () && isfp.IsEmpty ())
  66                                 return null;
  67
  68                         IsolatedStorageFilePermission p = new IsolatedStorageFilePermission (PermissionState.None);
  69                         p.m_userQuota = (m_userQuota < isfp.m_userQuota) ? m_userQuota : isfp.m_userQuota;
  70                         p.m_machineQuota = (m_machineQuota < isfp.m_machineQuota) ? m_machineQuota : isfp.m_machineQuota;
  71                         p.m_expirationDays = (m_expirationDays < isfp.m_expirationDays) ? m_expirationDays : isfp.m_expirationDays;
  72                         p.m_permanentData = (m_permanentData && isfp.m_permanentData);
  73                         // UsageAllowed == Unrestricted is a special case handled by the property
  74                         p.UsageAllowed = (m_allowed < isfp.m_allowed) ? m_allowed : isfp.m_allowed;
  75                         return p;
  76                 }
  77
  78                 public override bool IsSubsetOf (IPermission target)
  79                 {
  80                         IsolatedStorageFilePermission isfp = Cast (target);
  81                         if (isfp == null)
  82                                 return IsEmpty ();
  83                         if (isfp.IsUnrestricted ())
  84                                 return true;
  85
  86                         if (m_userQuota > isfp.m_userQuota)
  87                                 return false;
  88                         if (m_machineQuota > isfp.m_machineQuota)
  89                                 return false;
  90                         if (m_expirationDays > isfp.m_expirationDays)
  91                                 return false;
  92                         if (m_permanentData != isfp.m_permanentData)
  93                                 return false;
  94                         if (m_allowed > isfp.m_allowed)
  95                                 return false;
  96                         return true;
  97                 }
  98
  99                 public override IPermission Union (IPermission target)
 100                 {
 101                         IsolatedStorageFilePermission isfp = Cast (target);
 102                         if (isfp == null)
 103                                 return Copy ();
 104
 105                         IsolatedStorageFilePermission p = new IsolatedStorageFilePermission (PermissionState.None);
 106                         p.m_userQuota = (m_userQuota > isfp.m_userQuota) ? m_userQuota : isfp.m_userQuota;
 107                         p.m_machineQuota = (m_machineQuota > isfp.m_machineQuota) ? m_machineQuota : isfp.m_machineQuota;
 108                         p.m_expirationDays = (m_expirationDays > isfp.m_expirationDays) ? m_expirationDays : isfp.m_expirationDays;
 109                         p.m_permanentData = (m_permanentData || isfp.m_permanentData);
 110                         // UsageAllowed == Unrestricted is a special case handled by the property
 111                         p.UsageAllowed = (m_allowed > isfp.m_allowed) ? m_allowed : isfp.m_allowed;
 112                         return p;
 113                 }
 114
 115                 [MonoTODO ("(2.0) new override - something must have been added ???")]
 116                 [ComVisible (false)]
 117                 public override SecurityElement ToXml ()
 118                 {
 119                         return base.ToXml ();
 120                 }
 121
 122                 // IBuiltInPermission
 123                 int IBuiltInPermission.GetTokenIndex ()
 124                 {
 125                         return (int) BuiltInToken.IsolatedStorageFile;
 126                 }
 127
 128                 // helpers
 129
 130                 private IsolatedStorageFilePermission Cast (IPermission target)
 131                 {
 132                         if (target == null)
 133                                 return null;
 134
 135                         IsolatedStorageFilePermission isfp = (target as IsolatedStorageFilePermission);
 136                         if (isfp == null) {
 137                                 ThrowInvalidPermission (target, typeof (IsolatedStorageFilePermission));
 138                         }
 139
 140                         return isfp;
 141                 }
 142         }
 143 }