fNbt.NbtFile.DetectCompression C# (CSharp) Method

        static NbtCompression DetectCompression([NotNull] Stream stream)
        {
            NbtCompression compression;
            if (!stream.CanSeek) {
                throw new NotSupportedException("Cannot auto-detect compression on a stream that's not seekable.");
            }
            int firstByte = stream.ReadByte();
            switch (firstByte) {
                case -1:
                    throw new EndOfStreamException();

                case (byte)NbtTagType.Compound: // 0x0A
                    compression = NbtCompression.None;
                    break;

                case 0x1F:
                    // GZip magic number
                    compression = NbtCompression.GZip;
                    break;

                case 0x78:
                    // ZLib header
                    compression = NbtCompression.ZLib;
                    break;

                default:
                    throw new InvalidDataException("Could not auto-detect compression format.");
            }
            stream.Seek(-1, SeekOrigin.Current);
            return compression;
        }