mcs/class/referencesource/System.Runtime.Serialization/System/Runtime/Serialization/SpecialTypeDataContract.cs

   1 //-----------------------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //-----------------------------------------------------------------------------
   4
   5 namespace System.Runtime.Serialization
   6 {
   7     using System;
   8     using System.Collections.Generic;
   9     using System.Text;
  10     using System.Xml;
  11     using System.Security;
  12
  13     sealed class SpecialTypeDataContract : DataContract
  14     {
  15         [Fx.Tag.SecurityNote(Critical = "Holds instance of CriticalHelper which keeps state that is cached statically for serialization."
  16             + " Static fields are marked SecurityCritical or readonly to prevent data from being modified or leaked to other components in appdomain.")]
  17         [SecurityCritical]
  18         SpecialTypeDataContractCriticalHelper helper;
  19
  20         [Fx.Tag.SecurityNote(Critical = "Initializes SecurityCritical field 'helper'.",
  21             Safe = "Doesn't leak anything.")]
  22         [SecuritySafeCritical]
  23         public SpecialTypeDataContract(Type type)
  24             : base(new SpecialTypeDataContractCriticalHelper(type))
  25         {
  26             helper = base.Helper as SpecialTypeDataContractCriticalHelper;
  27         }
  28
  29         [Fx.Tag.SecurityNote(Critical = "Initializes SecurityCritical field 'helper'.",
  30             Safe = "Doesn't leak anything.")]
  31         [SecuritySafeCritical]
  32         public SpecialTypeDataContract(Type type, XmlDictionaryString name, XmlDictionaryString ns)
  33             : base(new SpecialTypeDataContractCriticalHelper(type, name, ns))
  34         {
  35             helper = base.Helper as SpecialTypeDataContractCriticalHelper;
  36         }
  37
  38         internal override bool IsBuiltInDataContract
  39         {
  40             get
  41             {
  42                 return true;
  43             }
  44         }
  45
  46         [Fx.Tag.SecurityNote(Critical = "Holds all state used for for (de)serializing known types like System.Enum, System.ValueType, etc."
  47             + " Since the data is cached statically, we lock down access to it.")]
  48         [SecurityCritical(SecurityCriticalScope.Everything)]
  49         class SpecialTypeDataContractCriticalHelper : DataContract.DataContractCriticalHelper
  50         {
  51             internal SpecialTypeDataContractCriticalHelper(Type type)
  52                 : base(type)
  53             {
  54             }
  55
  56             internal SpecialTypeDataContractCriticalHelper(Type type, XmlDictionaryString name, XmlDictionaryString ns)
  57                 : base(type)
  58             {
  59                 SetDataContractName(name, ns);
  60             }
  61         }
  62     }
  63 }
  64