/// <summary>
/// Updates the <paramref name="path"/> timestamps with the values given.
/// </summary>
/// <param name="path">Symbolic link to be updated.</param>
/// <param name="creationTime">Creation time.</param>
/// <param name="lastAccessTime">Last access time.</param>
/// <param name="lastWriteTime">Last write time.</param>
/// <exception cref="UnauthorizedAccessException">The caller does not have the required permission.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="path"/> is a zero-length string, contains only white space, or contains one or more invalid characters as defined by <see cref="Path.GetInvalidPathChars"/>.
/// <para>-or-</para>
/// <paramref name="path"/> is prefixed with, or contains only a colon character (<c>:</c>).
/// </exception>
/// <exception cref="ArgumentNullException"><paramref name="path"/> is <see langword="null"/>.</exception>
/// <exception cref="PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length.</exception>
/// <exception cref="DirectoryNotFoundException">The specified path is invalid (for example, it is on an unmapped drive).</exception>
/// <exception cref="NotSupportedException"><paramref name="path"/> contains a colon character (<c>:</c>) that is not part of a drive label (<c>"C:\"</c>).</exception>
/// <remarks>
/// The major difference between this method and the <see cref="File.SetAttributes"/> is that this method supports
/// setting attributes for symbolic links (both files and directories), while the <see cref="File.SetAttributes"/>
/// will set them for a target file, not the link itself.
/// </remarks>
public static void SetTimestamps(string path, DateTime creationTime, DateTime lastAccessTime, DateTime lastWriteTime)
{
string normalizedPath = LongPathCommon.NormalizePath(path);
using (SafeFileHandle handle = NativeMethods.CreateFile(
normalizedPath,
EFileAccess.FileWriteAttributes,
FileShare.ReadWrite,
IntPtr.Zero,
FileMode.Open,
EFileAttributes.OpenReparsePoint | EFileAttributes.BackupSemantics,
IntPtr.Zero))
{
if (handle.IsInvalid)
{
throw LongPathCommon.GetExceptionForHr(Marshal.GetHRForLastWin32Error(), path);
}
long creationFileTime = creationTime.ToLocalTime().ToFileTime();
long lastAccessFileTime = lastAccessTime.ToLocalTime().ToFileTime();
long lastWriteFileTime = lastWriteTime.ToLocalTime().ToFileTime();
if (!NativeMethods.SetFileTime(handle, ref creationFileTime, ref lastAccessFileTime, ref lastWriteFileTime))
{
throw LongPathCommon.GetExceptionForHr(Marshal.GetHRForLastWin32Error(), path);
}
}
}
/// <summary>
/// Normalizes path (can be longer than <c>MAX_PATH</c>) and adds <c>\\?\</c> long path prefix, if needed.
/// UNC paths are also supported.
/// </summary>
/// <param name="path">Path to be normalized.</param>
/// <returns>Normalized path.</returns>
/// <exception cref="ArgumentNullException"><paramref name="path"/> is <see langword="null"/>.</exception>
public static string NormalizePath(string path)
{
// This will also validate the path.
path = LongPathCommon.AddLongPathPrefix(path);
// Don't forget about the null terminator.
StringBuilder buffer = new StringBuilder(path.Length + 1);
uint normalizedPathLength = NativeMethods.GetFullPathName(path, (uint)buffer.Capacity, buffer, IntPtr.Zero);
// Length returned does not include null terminator.
if (normalizedPathLength > buffer.Capacity - 1)
{
// Resulting path longer than our buffer, so increase it.
buffer.Capacity = unchecked ((int)normalizedPathLength) + 1;
normalizedPathLength = NativeMethods.GetFullPathName(path, normalizedPathLength, buffer, IntPtr.Zero);
}
if (normalizedPathLength == 0)
{
throw LongPathCommon.GetExceptionForHr(Marshal.GetHRForLastWin32Error(), path);
}
if (normalizedPathLength > NativeMethods.MaxLongPath - 1)
{
throw LongPathCommon.GetExceptionForHr(NativeMethods.ErrorFilenameExcedRange, path);
}
return(buffer.ToString());
}
/// <summary>
/// Sets the attributes for a file or directory.
/// </summary>
/// <param name="path">The name of the file whose attributes are to be set.</param>
/// <param name="attributes">The file attributes to set for the file.</param>
/// <exception cref="UnauthorizedAccessException">The caller does not have the required permission.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="path"/> is a zero-length string, contains only white space, or contains one or more invalid characters as defined by <see cref="Path.GetInvalidPathChars"/>.
/// <para>-or-</para>
/// <paramref name="path"/> is prefixed with, or contains only a colon character (<c>:</c>).
/// </exception>
/// <exception cref="ArgumentNullException"><paramref name="path"/> is <see langword="null"/>.</exception>
/// <exception cref="PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length.</exception>
/// <exception cref="DirectoryNotFoundException">The specified path is invalid (for example, it is on an unmapped drive).</exception>
/// <exception cref="NotSupportedException"><paramref name="path"/> contains a colon character (<c>:</c>) that is not part of a drive label (<c>"C:\"</c>).</exception>
public static void SetAttributes(string path, FileAttributes attributes)
{
string normalizedPath = LongPathCommon.NormalizePath(path);
if (!NativeMethods.SetFileAttributes(normalizedPath, (EFileAttributes)attributes))
{
throw LongPathCommon.GetExceptionForHr(Marshal.GetHRForLastWin32Error(), path);
}
}