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228 lines
12 KiB
228 lines
12 KiB
/* Copyright (C) 2008-2016 Peter Palotas, Jeffrey Jangli, Alexandr Normuradov
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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using System.Diagnostics.CodeAnalysis;
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using System.IO;
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using System.Security;
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namespace Alphaleonis.Win32.Filesystem
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{
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public static partial class File
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{
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#region Public Methods
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/// <summary>Determines whether the specified file exists.</summary>
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/// <remarks>
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/// <para>MSDN: .NET 3.5+: Trailing spaces are removed from the end of the
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/// <paramref name="path"/> parameter before checking whether the directory exists.</para>
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/// <para>The Exists method returns <see langword="false"/> if any error occurs while trying to
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/// determine if the specified file exists.</para>
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/// <para>This can occur in situations that raise exceptions such as passing a file name with
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/// invalid characters or too many characters, a failing or missing disk, or if the caller does not have permission to read the
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/// file.</para>
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/// <para>The Exists method should not be used for path validation,
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/// this method merely checks if the file specified in path exists.</para>
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/// <para>Passing an invalid path to Exists returns false.</para>
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/// <para>Be aware that another process can potentially do something with the file in
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/// between the time you call the Exists method and perform another operation on the file, such as Delete.</para>
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/// </remarks>
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/// <param name="path">The file to check.</param>
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/// <returns>
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/// Returns <see langword="true"/> if the caller has the required permissions and
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/// <paramref name="path"/> contains the name of an existing file; otherwise,
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/// <see langword="false"/>
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/// </returns>
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[SecurityCritical]
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public static bool Exists(string path)
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{
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return ExistsCore(false, null, path, PathFormat.RelativePath);
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}
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/// <summary>[AlphaFS] Determines whether the specified file exists.</summary>
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/// <remarks>
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/// <para>MSDN: .NET 3.5+: Trailing spaces are removed from the end of the
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/// <paramref name="path"/> parameter before checking whether the directory exists.</para>
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/// <para>The Exists method returns <see langword="false"/> if any error occurs while trying to
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/// determine if the specified file exists.</para>
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/// <para>This can occur in situations that raise exceptions such as passing a file name with
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/// invalid characters or too many characters,</para>
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/// <para>a failing or missing disk, or if the caller does not have permission to read the
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/// file.</para>
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/// <para>The Exists method should not be used for path validation, this method merely checks
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/// if the file specified in path exists.</para>
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/// <para>Passing an invalid path to Exists returns false.</para>
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/// <para>Be aware that another process can potentially do something with the file in
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/// between the time you call the Exists method and perform another operation on the file, such
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/// as Delete.</para>
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/// </remarks>
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/// <param name="path">The file to check.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>
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/// <para>Returns <see langword="true"/> if the caller has the required permissions and
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/// <paramref name="path"/> contains the name of an existing file; otherwise,
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/// <see langword="false"/></para>
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/// </returns>
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[SecurityCritical]
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public static bool Exists(string path, PathFormat pathFormat)
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{
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return ExistsCore(false, null, path, pathFormat);
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}
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#region Transactional
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/// <summary>
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/// [AlphaFS] Determines whether the specified file exists.
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/// </summary>
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/// <remarks>
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/// <para>MSDN: .NET 3.5+: Trailing spaces are removed from the end of the
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/// <paramref name="path"/> parameter before checking whether the directory exists.</para>
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/// <para>The Exists method returns <see langword="false"/> if any error occurs while trying to
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/// determine if the specified file exists.</para>
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/// <para>This can occur in situations that raise exceptions such as passing a file name with
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/// invalid characters or too many characters,</para>
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/// <para>a failing or missing disk, or if the caller does not have permission to read the
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/// file.</para>
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/// <para>The Exists method should not be used for path validation,</para>
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/// <para>this method merely checks if the file specified in path exists.</para>
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/// <para>Passing an invalid path to Exists returns false.</para>
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/// <para>Be aware that another process can potentially do something with the file in
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/// between</para>
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/// <para>the time you call the Exists method and perform another operation on the file, such
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/// as Delete.</para>
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/// </remarks>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The file to check.</param>
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/// <returns>
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/// <para>Returns <see langword="true"/> if the caller has the required permissions</para>
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/// <para>and <paramref name="path"/> contains the name of an existing file; otherwise,
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/// <see langword="false"/></para>
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/// </returns>
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[SecurityCritical]
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public static bool ExistsTransacted(KernelTransaction transaction, string path)
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{
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return ExistsCore(false, transaction, path, PathFormat.RelativePath);
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}
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/// <summary>
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/// [AlphaFS] Determines whether the specified file exists.
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/// </summary>
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/// <remarks>
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/// <para>MSDN: .NET 3.5+: Trailing spaces are removed from the end of the
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/// <paramref name="path"/> parameter before checking whether the directory exists.</para>
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/// <para>The Exists method returns <see langword="false"/> if any error occurs while trying to
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/// determine if the specified file exists.</para>
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/// <para>This can occur in situations that raise exceptions such as passing a file name with
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/// invalid characters or too many characters,</para>
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/// <para>a failing or missing disk, or if the caller does not have permission to read the
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/// file.</para>
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/// <para>The Exists method should not be used for path validation,</para>
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/// <para>this method merely checks if the file specified in path exists.</para>
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/// <para>Passing an invalid path to Exists returns false.</para>
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/// <para>Be aware that another process can potentially do something with the file in
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/// between</para>
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/// <para>the time you call the Exists method and perform another operation on the file, such
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/// as Delete.</para>
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/// </remarks>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The file to check.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>
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/// <para>Returns <see langword="true"/> if the caller has the required permissions</para>
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/// <para>and <paramref name="path"/> contains the name of an existing file; otherwise,
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/// <see langword="false"/></para>
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/// </returns>
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[SecurityCritical]
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public static bool ExistsTransacted(KernelTransaction transaction, string path, PathFormat pathFormat)
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{
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return ExistsCore(false, transaction, path, pathFormat);
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}
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#endregion // Transacted
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#endregion
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#region Internal Methods
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/// <summary>Determines whether the specified file or directory exists.</summary>
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/// <remarks>
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/// <para>MSDN: .NET 3.5+: Trailing spaces are removed from the end of the <paramref name="path"/> parameter before checking whether
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/// the directory exists.</para>
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/// <para>The Exists method returns <see langword="false"/> if any error occurs while trying to determine if the specified file
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/// exists.</para>
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/// <para>This can occur in situations that raise exceptions such as passing a file name with invalid characters or too many characters,
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/// </para>
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/// <para>a failing or missing disk, or if the caller does not have permission to read the file.</para>
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/// <para>The Exists method should not be used for path validation,
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/// this method merely checks if the file specified in path exists.</para>
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/// <para>Passing an invalid path to Exists returns false.</para>
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/// <para>Be aware that another process can potentially do something with the file in between
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/// the time you call the Exists method and perform another operation on the file, such as Delete.</para>
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/// </remarks>
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/// <param name="isFolder">Specifies that <paramref name="path"/> is a file or directory.</param>
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/// <param name="transaction">The transaction.</param>
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/// <param name="path">The file to check.</param>
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/// <param name="pathFormat">Indicates the format of the path parameter(s).</param>
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/// <returns>
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/// <para>Returns <see langword="true"/> if the caller has the required permissions</para>
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/// <para>and <paramref name="path"/> contains the name of an existing file or directory; otherwise, <see langword="false"/></para>
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/// </returns>
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
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[SecurityCritical]
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internal static bool ExistsCore(bool isFolder, KernelTransaction transaction, string path, PathFormat pathFormat)
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{
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// Will be caught later and be thrown as an ArgumentException or ArgumentNullException.
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// Let's take a shorter route, preventing an Exception from being thrown altogether.
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if (Utils.IsNullOrWhiteSpace(path))
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return false;
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// DriveInfo.IsReady() will fail.
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//
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//// After normalizing, check whether path ends in directory separator.
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//// Otherwise, FillAttributeInfoCore removes it and we may return a false positive.
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//string pathRp = Path.GetRegularPathCore(path, true, false, false, false);
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//if (pathRp.Length > 0 && Path.IsDVsc(pathRp[pathRp.Length - 1], false))
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// return false;
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try
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{
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string pathLp = Path.GetExtendedLengthPathCore(transaction, path, pathFormat, GetFullPathOptions.TrimEnd | GetFullPathOptions.RemoveTrailingDirectorySeparator | GetFullPathOptions.CheckInvalidPathChars | GetFullPathOptions.ContinueOnNonExist);
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var data = new NativeMethods.WIN32_FILE_ATTRIBUTE_DATA();
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int dataInitialised = FillAttributeInfoCore(transaction, pathLp, ref data, false, true);
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return (dataInitialised == Win32Errors.ERROR_SUCCESS &&
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data.dwFileAttributes != (FileAttributes) (-1) &&
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(isFolder
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? (data.dwFileAttributes & FileAttributes.Directory) != 0
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: (data.dwFileAttributes & FileAttributes.Directory) == 0));
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}
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catch
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{
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return false;
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}
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}
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#endregion // Internal Methods
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}
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}
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