1 files changed, 151 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Security/Policy/Zone.cs b/src/mscorlib/src/System/Security/Policy/Zone.cs
new file mode 100644
index 0000000000..c999abe340
--- /dev/null
+++ b/src/mscorlib/src/System/Security/Policy/Zone.cs
@@ -0,0 +1,151 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// 
+
+//
+//
+//  Zone is an IIdentity representing Internet/Intranet/MyComputer etc.
+//
+
+namespace System.Security.Policy {
+    using System.Security.Util;
+    using ZoneIdentityPermission = System.Security.Permissions.ZoneIdentityPermission;
+    using System.Runtime.CompilerServices;
+    using System.Runtime.InteropServices;
+    using System.Runtime.Versioning;
+    using System.Runtime.Serialization;
+    using System.Diagnostics.Contracts;
+
+    [Serializable]
+    [System.Runtime.InteropServices.ComVisible(true)]
+    public sealed class Zone : EvidenceBase, IIdentityPermissionFactory
+    {
+#if FEATURE_CAS_POLICY
+        [OptionalField(VersionAdded = 2)]
+        private String m_url;
+#endif // FEATURE_CAS_POLICY
+        private SecurityZone m_zone;
+
+        private static readonly String[] s_names =
+            {"MyComputer", "Intranet", "Trusted", "Internet", "Untrusted", "NoZone"};
+
+        public Zone(SecurityZone zone)
+        {
+            if (zone < SecurityZone.NoZone || zone > SecurityZone.Untrusted)
+                throw new ArgumentException( Environment.GetResourceString( "Argument_IllegalZone" ) );
+            Contract.EndContractBlock();
+
+            m_zone = zone;
+        }
+
+        private Zone(Zone zone)
+        {
+            Contract.Assert(zone != null);
+
+#if FEATURE_CAS_POLICY
+            m_url = zone.m_url;
+#endif // FEATURE_CAS_POLICY
+            m_zone = zone.m_zone;
+        }
+
+#if FEATURE_CAS_POLICY
+        private Zone(String url)
+        {
+            m_url = url;
+            m_zone = SecurityZone.NoZone;
+        }
+
+        public static Zone CreateFromUrl( String url )
+        {
+            if (url == null)
+                throw new ArgumentNullException( "url" );
+            Contract.EndContractBlock();
+
+            return new Zone( url );
+        }
+
+        [System.Security.SecurityCritical]  // auto-generated
+        [DllImport(JitHelpers.QCall, CharSet = CharSet.Unicode)]
+        [SuppressUnmanagedCodeSecurity]
+        private extern static SecurityZone _CreateFromUrl( String url );
+#endif // FEATURE_CAS_POLICY
+
+        public IPermission CreateIdentityPermission( Evidence evidence )
+        {
+            return new ZoneIdentityPermission( SecurityZone );
+        }
+
+        public SecurityZone SecurityZone
+        {
+            [System.Security.SecuritySafeCritical]  // auto-generated
+            get
+            {
+#if FEATURE_CAS_POLICY
+                if (m_url != null)
+                    m_zone = _CreateFromUrl( m_url );
+#endif // FEATURE_CAS_POLICY
+
+                return m_zone;
+            }
+        }
+
+        public override bool Equals(Object o)
+        {
+            Zone other = o as Zone;
+            if (other == null)
+            {
+                return false;
+            }
+
+            return SecurityZone == other.SecurityZone;
+        }
+
+        public override int GetHashCode()
+        {
+            return (int)SecurityZone;
+        }
+
+        public override EvidenceBase Clone()
+        {
+            return new Zone(this);
+        }
+
+        public Object Copy()
+        {
+            return Clone();
+        }
+
+#if FEATURE_CAS_POLICY
+        internal SecurityElement ToXml()
+        {
+            SecurityElement elem = new SecurityElement( "System.Security.Policy.Zone" );
+            // If you hit this assert then most likely you are trying to change the name of this class. 
+            // This is ok as long as you change the hard coded string above and change the assert below.
+            Contract.Assert( this.GetType().FullName.Equals( "System.Security.Policy.Zone" ), "Class name changed!" );
+
+            elem.AddAttribute( "version", "1" );
+            if (SecurityZone != SecurityZone.NoZone)
+                elem.AddChild( new SecurityElement( "Zone", s_names[(int)SecurityZone] ) );
+            else
+                elem.AddChild( new SecurityElement( "Zone", s_names[s_names.Length-1] ) );
+            return elem;
+        }
+#endif // FEATURE_CAS_POLICY
+
+#if FEATURE_CAS_POLICY
+        public override String ToString()
+        {
+            return ToXml().ToString();
+        }
+#endif // FEATURE_CAS_POLICY
+
+        // INormalizeForIsolatedStorage is not implemented for startup perf
+        // equivalent to INormalizeForIsolatedStorage.Normalize()
+        internal Object Normalize()
+        {
+            return s_names[(int)SecurityZone];
+        }
+    }
+}