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// 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.
//
//
namespace System.Security.Permissions
{
using System;
using System.Globalization;
using System.Runtime.Serialization;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
[System.Runtime.InteropServices.ComVisible(true)]
#if FEATURE_SERIALIZATION
[Serializable]
#endif
sealed public class ZoneIdentityPermission : CodeAccessPermission, IBuiltInPermission
{
//------------------------------------------------------
//
// PRIVATE STATE DATA
//
//------------------------------------------------------
// Zone Enum Flag
// ----- ----- -----
// NoZone -1 0x00
// MyComputer 0 0x01 (1 << 0)
// Intranet 1 0x02 (1 << 1)
// Trusted 2 0x04 (1 << 2)
// Internet 3 0x08 (1 << 3)
// Untrusted 4 0x10 (1 << 4)
private const uint AllZones = 0x1f;
[OptionalField(VersionAdded = 2)]
private uint m_zones;
//------------------------------------------------------
//
// PUBLIC CONSTRUCTORS
//
//------------------------------------------------------
public ZoneIdentityPermission(PermissionState state)
{
if (state == PermissionState.Unrestricted)
{
m_zones = AllZones;
}
else if (state == PermissionState.None)
{
m_zones = 0;
}
else
{
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPermissionState"));
}
}
public ZoneIdentityPermission( SecurityZone zone )
{
this.SecurityZone = zone;
}
internal ZoneIdentityPermission( uint zones )
{
m_zones = (zones & AllZones);
}
// Internal function to append all the Zone in this permission to the input ArrayList
internal void AppendZones(ArrayList zoneList)
{
int nEnum = 0;
uint nFlag;
for(nFlag = 1; nFlag < AllZones; nFlag <<= 1)
{
if((m_zones & nFlag) != 0)
{
zoneList.Add((SecurityZone)nEnum);
}
nEnum++;
}
}
//------------------------------------------------------
//
// PUBLIC ACCESSOR METHODS
//
//------------------------------------------------------
public SecurityZone SecurityZone
{
set
{
VerifyZone( value );
if(value == SecurityZone.NoZone)
m_zones = 0;
else
m_zones = (uint)1 << (int)value;
}
get
{
SecurityZone z = SecurityZone.NoZone;
int nEnum = 0;
uint nFlag;
for(nFlag = 1; nFlag < AllZones; nFlag <<= 1)
{
if((m_zones & nFlag) != 0)
{
if(z == SecurityZone.NoZone)
z = (SecurityZone)nEnum;
else
return SecurityZone.NoZone;
}
nEnum++;
}
return z;
}
}
//------------------------------------------------------
//
// PRIVATE AND PROTECTED HELPERS FOR ACCESSORS AND CONSTRUCTORS
//
//------------------------------------------------------
private static void VerifyZone( SecurityZone zone )
{
if (zone < SecurityZone.NoZone || zone > SecurityZone.Untrusted)
{
throw new ArgumentException( Environment.GetResourceString("Argument_IllegalZone") );
}
Contract.EndContractBlock();
}
//------------------------------------------------------
//
// CODEACCESSPERMISSION IMPLEMENTATION
//
//------------------------------------------------------
//------------------------------------------------------
//
// IPERMISSION IMPLEMENTATION
//
//------------------------------------------------------
public override IPermission Copy()
{
return new ZoneIdentityPermission(this.m_zones);
}
public override bool IsSubsetOf(IPermission target)
{
if (target == null)
return this.m_zones == 0;
ZoneIdentityPermission that = target as ZoneIdentityPermission;
if (that == null)
throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", this.GetType().FullName));
return (this.m_zones & that.m_zones) == this.m_zones;
}
public override IPermission Intersect(IPermission target)
{
if (target == null)
return null;
ZoneIdentityPermission that = target as ZoneIdentityPermission;
if (that == null)
throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", this.GetType().FullName));
uint newZones = this.m_zones & that.m_zones;
if(newZones == 0)
return null;
return new ZoneIdentityPermission(newZones);
}
public override IPermission Union(IPermission target)
{
if (target == null)
return this.m_zones != 0 ? this.Copy() : null;
ZoneIdentityPermission that = target as ZoneIdentityPermission;
if (that == null)
throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", this.GetType().FullName));
return new ZoneIdentityPermission(this.m_zones | that.m_zones);
}
/// <internalonly/>
int IBuiltInPermission.GetTokenIndex()
{
return ZoneIdentityPermission.GetTokenIndex();
}
internal static int GetTokenIndex()
{
return BuiltInPermissionIndex.ZoneIdentityPermissionIndex;
}
}
}
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