svn path=/trunk/mcs/; revision=45118

diff --git a/mcs/class/corlib/System.Security/PermissionBuilder.cs b/mcs/class/corlib/System.Security/PermissionBuilder.cs
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+++ b/mcs/class/corlib/System.Security/PermissionBuilder.cs
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+//
+// System.Security.PermissionBuilder.cs
+//
+// Author:
+//     Sebastien Pouliot  <sebastien@ximian.com>
+//
+// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+using System.Security.Permissions;
+
+namespace System.Security {
+
+#if NET_2_0
+       internal static class PermissionBuilder {
+#else
+       internal class PermissionBuilder {
+#endif
+               private static object[] psNone = new object [1] { PermissionState.None };
+
+               // can be used to create an empty or an unrestricted permission from any valid type
+               static public IPermission Create (string fullname, PermissionState state)
+               {
+                       if (fullname == null)
+                               throw new ArgumentNullException ("fullname");
+
+                       SecurityElement se = new SecurityElement ("IPermission");
+                       se.AddAttribute ("class", fullname);
+                       se.AddAttribute ("version", "1");
+                       if (state == PermissionState.Unrestricted)
+                               se.AddAttribute ("Unrestricted", "true");
+
+                       return CreatePermission (fullname, se);
+               }
+
+               static public IPermission Create (SecurityElement se)
+               {
+                       if (se == null)
+                               throw new ArgumentNullException ("se");
+
+                       string className = se.Attribute ("class");
+                       if ((className == null) || (className.Length == 0))
+                               throw new ArgumentException ("class");
+
+                       return CreatePermission (className, se);
+               }
+
+               // to use in case where the "class" attribute isn't a fully qualified class name
+               static public IPermission Create (string fullname, SecurityElement se)
+               {
+                       if (fullname == null)
+                               throw new ArgumentNullException ("fullname");
+                       if (se == null)
+                               throw new ArgumentNullException ("se");
+
+                       return CreatePermission (fullname, se);
+               }
+
+               // internal stuff
+
+               internal static IPermission CreatePermission (string fullname, SecurityElement se)
+               {
+                       Type classType = GetUnifiedType (fullname);
+                       if (classType == null) {
+                               string msg = Locale.GetText ("Can't create an instance of permission class {0}.");
+#if NET_2_0
+                               throw new TypeLoadException (String.Format (msg, fullname));
+#else
+                               throw new ArgumentException (String.Format (msg, fullname));
+#endif
+                       }
+
+                       IPermission p = (IPermission) Activator.CreateInstance (classType, psNone);
+                       p.FromXml (se);
+                       return p;
+               }
+
+               // http://blogs.msdn.com/shawnfa/archive/2004/08/05/209320.aspx
+               static internal Type GetUnifiedType (string fullname)
+               {
+                       // ensure that permission signed with ECMA or MS "final" key gets unified
+                       if (fullname.EndsWith (", PublicKeyToken=b03f5f7f11d50a3a") ||
+                           fullname.EndsWith (", PublicKeyToken=b77a5c561934e089")) {
+                               // public key token match, check versions
+#if NET_2_0
+                               if (fullname.IndexOf (", Version=2.0.0.0, ") < 0)
+                                       fullname = Unify (fullname, "2.0.0.0");
+#else
+                               if (fullname.IndexOf (", Version=1.0.5000.0, ") < 0)
+                                       fullname = Unify (fullname, "1.0.5000.0");
+#endif
+                       }
+
+                       return Type.GetType (fullname);
+               }
+
+               static internal string Unify (string fullname, string version)
+               {
+                       int vs = fullname.IndexOf (", Version=");
+                       int ve = fullname.IndexOf (",", vs + 10);
+                       return fullname.Substring (0, vs + 10) + version + fullname.Substring (ve);
+               }
+       }
+}