public static DirectoryEntry ReadFrom(DataReader reader)
{
long startPos = reader.Position;
long length = reader.ReadInt64();
if (length == 0)
{
return null;
}
DirectoryEntry result = new DirectoryEntry();
result.Length = length;
result.Attributes = (FileAttributes)reader.ReadUInt32();
result.SecurityId = reader.ReadUInt32();
result.SubdirOffset = reader.ReadInt64();
reader.Skip(16);
result.CreationTime = reader.ReadInt64();
result.LastAccessTime = reader.ReadInt64();
result.LastWriteTime = reader.ReadInt64();
result.Hash = reader.ReadBytes(20);
reader.Skip(4);
result.ReparseTag = reader.ReadUInt32();
result.HardLink = reader.ReadUInt32();
result.StreamCount = reader.ReadUInt16();
int shortNameLength = reader.ReadUInt16();
int fileNameLength = reader.ReadUInt16();
if (fileNameLength > 0)
{
result.FileName = Encoding.Unicode.GetString(reader.ReadBytes(fileNameLength + 2)).TrimEnd('\0');
}
else
{
result.FileName = string.Empty;
}
if (shortNameLength > 0)
{
result.ShortName = Encoding.Unicode.GetString(reader.ReadBytes(shortNameLength + 2)).TrimEnd('\0');
}
else
{
result.ShortName = null;
}
if (startPos + length > reader.Position)
{
int toRead = (int)(startPos + length - reader.Position);
reader.Skip(toRead);
}
if (result.StreamCount > 0)
{
result.AlternateStreams = new Dictionary<string, AlternateStreamEntry>();
for (int i = 0; i < result.StreamCount; ++i)
{
AlternateStreamEntry stream = AlternateStreamEntry.ReadFrom(reader);
result.AlternateStreams.Add(stream.Name, stream);
}
}
return result;
}
/// <summary>
/// Indicates if a file exists.
/// </summary>
/// <param name="path">The path to test.</param>
/// <returns>true if the file exists.</returns>
public override bool FileExists(string path)
{
DirectoryEntry dirEntry = GetEntry(path);
return(dirEntry != null && (dirEntry.Attributes & FileAttributes.Directory) == 0);
}
/// <summary>
/// Gets the file id for a given path.
/// </summary>
/// <param name="path">The path to get the id of.</param>
/// <returns>The file id, or -1.</returns>
/// <remarks>
/// The returned file id uniquely identifies the file, and is shared by all hard
/// links to the same file. The value -1 indicates no unique identifier is
/// available, and so it can be assumed the file has no hard links.
/// </remarks>
public long GetFileId(string path)
{
DirectoryEntry dirEntry = GetEntry(path);
return(dirEntry.HardLink == 0 ? -1 : (long)dirEntry.HardLink);
}
/// <summary>
/// Indicates whether the file is known by other names.
/// </summary>
/// <param name="path">The file to inspect.</param>
/// <returns><c>true</c> if the file has other names, else <c>false</c>.</returns>
public bool HasHardLinks(string path)
{
DirectoryEntry dirEntry = GetEntry(path);
return(dirEntry.HardLink != 0);
}
/// <summary>
/// Gets the short name for a given path.
/// </summary>
/// <param name="path">The path to convert.</param>
/// <returns>The short name.</returns>
/// <remarks>
/// This method only gets the short name for the final part of the path, to
/// convert a complete path, call this method repeatedly, once for each path
/// segment. If there is no short name for the given path,<c>null</c> is
/// returned.
/// </remarks>
public string GetShortName(string path)
{
DirectoryEntry dirEntry = GetEntry(path);
return(dirEntry.ShortName);
}
