b.Reset()
		bc.Reset()

		bytebufferpool.Put(b)
		bytebufferpool.Put(bc)
	}()

	w, err := zstd.NewWriter(bc)
	if err != nil {
		return nil, nil, err
	}

	if _, err = io.Copy(w, io.TeeReader(reader, b)); err != nil {
		return nil, nil, err
	}

	w.Close()
	return bc.Bytes(), b.Bytes(), nil
}

const (
	// Update this whenever the official minisign pubkey is rotated.

	if globalCacheConfig.MatchesSize(size) {
		buf = bytebufferpool.Get()
		defer bytebufferpool.Put(buf)
	}

	var reader io.Reader
	reader = rd
	if buf != nil {
		reader = io.TeeReader(rd, buf)
	}

	actualSize := size
	var idxCb func() []byte
	if isCompressible(r.Header, object) && size > minCompressibleSize {
		// Storing the compression metadata.

pkg io, func Pipe() (*PipeReader, *PipeWriter)
pkg io, func ReadAtLeast(Reader, []uint8, int) (int, error)
pkg io, func ReadFull(Reader, []uint8) (int, error)
pkg io, func TeeReader(Reader, Writer) Reader
pkg io, func WriteString(Writer, string) (int, error)
pkg io, method (*LimitedReader) Read([]uint8) (int, error)
pkg io, method (*PipeReader) Close() error