namespace System.IO.Compression { public class GZipStream : Stream { public Stream BaseStream { get; } public GZipStream(Stream stream, CompressionLevel compressionLevel); public GZipStream(Stream stream, CompressionLevel compressionLevel, bool leaveOpen); public GZipStream(Stream stream, CompressionMode mode); public GZipStream(Stream stream, CompressionMode mode, bool leaveOpen); } }