FileSystemEntry.cs

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namespace System.IO.Enumeration;
 
public ref struct FileSystemEntry
{
    internal unsafe Interop.NtDll.FILE_FULL_DIR_INFORMATION* _info;
 
    public ReadOnlySpan<char> Directory { get; private set; }
 
    public ReadOnlySpan<char> RootDirectory { get; private set; }
 
    public ReadOnlySpan<char> OriginalRootDirectory { get; private set; }
 
    public unsafe ReadOnlySpan<char> FileName => _info->FileName;
 
    public unsafe FileAttributes Attributes => _info->FileAttributes;
 
    public unsafe long Length => _info->EndOfFile;
 
    public unsafe DateTimeOffset CreationTimeUtc => _info->CreationTime.ToDateTimeOffset();
 
    public unsafe DateTimeOffset LastAccessTimeUtc => _info->LastAccessTime.ToDateTimeOffset();
 
    public unsafe DateTimeOffset LastWriteTimeUtc => _info->LastWriteTime.ToDateTimeOffset();
 
    public bool IsDirectory => (Attributes & FileAttributes.Directory) != 0;
 
    public bool IsHidden => (Attributes & FileAttributes.Hidden) != 0;
 
    public string ToSpecifiedFullPath()
    {
        ReadOnlySpan<char> readOnlySpan = Directory.Slice(RootDirectory.Length);
        if (Path.EndsInDirectorySeparator(OriginalRootDirectory) && PathInternal.StartsWithDirectorySeparator(readOnlySpan))
        {
            readOnlySpan = readOnlySpan.Slice(1);
        }
        return Path.Join(OriginalRootDirectory, readOnlySpan, FileName);
    }
 
    internal unsafe static void Initialize(ref FileSystemEntry entry, Interop.NtDll.FILE_FULL_DIR_INFORMATION* info, ReadOnlySpan<char> directory, ReadOnlySpan<char> rootDirectory, ReadOnlySpan<char> originalRootDirectory)
    {
        entry._info = info;
        entry.Directory = directory;
        entry.RootDirectory = rootDirectory;
        entry.OriginalRootDirectory = originalRootDirectory;
    }
 
    public FileSystemInfo ToFileSystemInfo()
    {
        return FileSystemInfo.Create(Path.Join(Directory, FileName), ref this);
    }
 
    public string ToFullPath()
    {
        return Path.Join(Directory, FileName);
    }
}