tsuku is a C# library that makes cross-platform extended attribute access easy.
On Linux and MacOS, this is handled via getxattr and setxattr. On Windows, alternate data streams are used to imitate this feature.
Note that this is not a full ADS library. The max size of attributes is forcibly limited to 512 bytes. Attribute names are also limited to 112 characters max, and are prefixed with 'tsuku' across all platforms. tsuku only handles file attributes created by tsuku, for safety reasons.
tsuku's API is very simple and easy to understand.
public struct TsukuAttributeInfo
{
public string Name { get; }
public int Size { get; }
}
public static void SetAttribute(this FileInfo @this, string name, ReadOnlySpan<byte> data);
public static void GetAttribute(this FileInfo @this, string name, ref Span<byte> data);
public static byte[] GetAttribute(this FileInfo @this, string name);
public static void DeleteAttribute(this FileInfo @this, string name);
public static IEnumerable<TsukuAttributeInfo>GetAttributeInfos(this FileInfo @this);There are also helper extensions in Tsuku.Extensions for easy setting of string, Guid, and bool attributes.
Supported filesystems are NTFS on Windows, Ext4 and Btrfs on Linux, and APFS on macOS, with HFS+ possibly supported but untested. Attributes are preserved across move and copy if the underlying filesystem driver supports attribute preservation.