NTFSSecurity-Module/AlphaFS/Filesystem/Safe Handles/SafeFindFileHandle.cs

/*  Copyright (C) 2008-2016 Peter Palotas, Jeffrey Jangli, Alexandr Normuradov
 *  
 *  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 
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 *  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;
using System.Security;
using Microsoft.Win32.SafeHandles;

namespace Alphaleonis.Win32.Filesystem
{
   /// <summary>Represents a wrapper class for a handle used by the FindFirstFile/FindNextFile Win32 API functions.</summary>
   [SecurityCritical]
   public sealed class SafeFindFileHandle : SafeHandleZeroOrMinusOneIsInvalid
   {
      /// <summary>Initializes a new instance of the <see cref="SafeFindFileHandle"/> class.</summary>
      private SafeFindFileHandle() : base(true)
      {
      }

      /// <summary>Initializes a new instance of the <see cref="SafeFindFileHandle"/> class.</summary>
      /// <param name="handle">The handle.</param>
      /// <param name="callerHandle"><see langword="true"/> [owns handle].</param>
      public SafeFindFileHandle(IntPtr handle, bool callerHandle) : base(callerHandle)
      {
         SetHandle(handle);
      }

      /// <summary>When overridden in a derived class, executes the code required to free the handle.</summary>
      /// <returns><see langword="true"/> if the handle is released successfully; otherwise, in the event of a catastrophic failure, <see langword="false"/>. In this case, it generates a ReleaseHandleFailed Managed Debugging Assistant.</returns>
      protected override bool ReleaseHandle()
      {
         return NativeMethods.FindClose(handle);
      }
   }
}