87 lines
2.7 KiB
C#
87 lines
2.7 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc.
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// All Rights Reserved
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
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// WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF
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// TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR
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// NON-INFRINGEMENT.
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// See the Apache 2 License for the specific language governing
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// permissions and limitations under the License.
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// -----------------------------------------------------------------------
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// <copyright file="SafeCredentialReference.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// -----------------------------------------------------------------------
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using System;
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using System.Runtime.CompilerServices;
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using Microsoft.Win32.SafeHandles;
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namespace Microsoft.AspNet.Security.Windows
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{
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internal sealed class SafeCredentialReference : CriticalHandleMinusOneIsInvalid
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{
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// Static cache will return the target handle if found the reference in the table.
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internal SafeFreeCredentials _Target;
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private SafeCredentialReference(SafeFreeCredentials target)
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: base()
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{
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// Bumps up the refcount on Target to signify that target handle is statically cached so
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// its dispose should be postponed
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bool b = false;
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RuntimeHelpers.PrepareConstrainedRegions();
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try
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{
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target.DangerousAddRef(ref b);
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}
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catch
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{
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if (b)
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{
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target.DangerousRelease();
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b = false;
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}
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}
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finally
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{
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if (b)
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{
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_Target = target;
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SetHandle(new IntPtr(0)); // make this handle valid
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}
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}
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}
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internal static SafeCredentialReference CreateReference(SafeFreeCredentials target)
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{
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SafeCredentialReference result = new SafeCredentialReference(target);
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if (result.IsInvalid)
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{
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return null;
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}
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return result;
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}
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protected override bool ReleaseHandle()
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{
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SafeFreeCredentials target = _Target;
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if (target != null)
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{
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target.DangerousRelease();
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}
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_Target = null;
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return true;
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}
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}
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}
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