NTFSSecurity/AlphaFS/Filesystem/File Class/File.GetFileSystemEntryInfo.cs

/*  Copyright (C) 2008-2016 Peter Palotas, Jeffrey Jangli, Alexandr Normuradov
 *  
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 *  of this software and associated documentation files (the "Software"), to deal 
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 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
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using System;
using System.Security;

namespace Alphaleonis.Win32.Filesystem
{
   public static partial class File
   {
      #region GetFileSystemEntry

      /// <summary>[AlphaFS] Gets the <see cref="FileSystemEntryInfo"/> of the file on the path.</summary>
      /// <returns>The <see cref="FileSystemEntryInfo"/> instance of the file or directory.</returns>
      /// <param name="path">The path to the file or directory.</param>
      /// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
      [SecurityCritical]
      public static FileSystemEntryInfo GetFileSystemEntryInfo(string path, PathFormat pathFormat)
      {
         return GetFileSystemEntryInfoCore(false, null, path, false, pathFormat);
      }

      /// <summary>[AlphaFS] Gets the <see cref="FileSystemEntryInfo"/> of the file on the path.</summary>
      /// <returns>The <see cref="FileSystemEntryInfo"/> instance of the file or directory.</returns>
      /// <param name="path">The path to the file or directory.</param>
      [SecurityCritical]
      public static FileSystemEntryInfo GetFileSystemEntryInfo(string path)
      {
         return GetFileSystemEntryInfoCore(false, null, path, false, PathFormat.RelativePath);
      }

      /// <summary>[AlphaFS] Gets the <see cref="FileSystemEntryInfo"/> of the file on the path.</summary>
      /// <returns>The <see cref="FileSystemEntryInfo"/> instance of the file or directory.</returns>
      /// <param name="transaction">The transaction.</param>
      /// <param name="path">The path to the file or directory.</param>
      /// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
      [SecurityCritical]
      public static FileSystemEntryInfo GetFileSystemEntryInfoTransacted(KernelTransaction transaction, string path, PathFormat pathFormat)
      {
         return GetFileSystemEntryInfoCore(false, transaction, path, false, pathFormat);
      }

      /// <summary>[AlphaFS] Gets the <see cref="FileSystemEntryInfo"/> of the file on the path.</summary>
      /// <returns>The <see cref="FileSystemEntryInfo"/> instance of the file or directory.</returns>
      /// <param name="transaction">The transaction.</param>
      /// <param name="path">The path to the file or directory.</param>
      [SecurityCritical]
      public static FileSystemEntryInfo GetFileSystemEntryInfoTransacted(KernelTransaction transaction, string path)
      {
         return GetFileSystemEntryInfoCore(false, transaction, path, false, PathFormat.RelativePath);
      }

      #endregion // GetFileSystemEntry

      #region Internal Methods

      /// <summary>Gets a FileSystemEntryInfo from a Non-/Transacted directory/file.</summary>
      /// <returns>The <see cref="FileSystemEntryInfo"/> instance of the file or directory, or <c>null</c> on Exception when <paramref name="continueOnException"/> is <c>true</c>.</returns>
      /// <remarks>BasicSearch <see cref="NativeMethods.FINDEX_INFO_LEVELS.Basic"/> and LargeCache <see cref="NativeMethods.FindExAdditionalFlags.LargeFetch"/> are used by default, if possible.</remarks>
      /// <exception cref="ArgumentException"/>
      /// <exception cref="ArgumentNullException"/>
      /// <param name="isFolder">Specifies that <paramref name="path"/> is a file or directory.</param>
      /// <param name="transaction">The transaction.</param>
      /// <param name="path">The path to the file or directory.</param>
      /// <param name="continueOnException">
      ///    <para><c>true</c> suppress any Exception that might be thrown as a result from a failure,</para>
      ///    <para>such as ACLs protected directories or non-accessible reparse points.</para>
      /// </param>
      /// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
      [SecurityCritical]
      internal static FileSystemEntryInfo GetFileSystemEntryInfoCore(bool isFolder, KernelTransaction transaction, string path, bool continueOnException, PathFormat pathFormat)
      {
         // Enable BasicSearch and LargeCache by default.
         var options = DirectoryEnumerationOptions.BasicSearch | DirectoryEnumerationOptions.LargeCache | (continueOnException ? DirectoryEnumerationOptions.ContinueOnException : 0);

         return (new FindFileSystemEntryInfo(isFolder, transaction, path, Path.WildcardStarMatchAll, options, typeof(FileSystemEntryInfo), pathFormat)).Get<FileSystemEntryInfo>();
      }

      #endregion // Internal Methods

   }
}