const BufSize = 1000
	b := NewReaderSize(strings.NewReader("hello world"), BufSize)
	// Does it recognize itself?
	b1 := NewReaderSize(b, BufSize)
	if b1 != b {
		t.Error("NewReaderSize did not detect underlying Reader")
	}
	// Does it wrap if existing buffer is too small?
	b2 := NewReaderSize(b, 2*BufSize)
	if b2 == b {
		t.Error("NewReaderSize did not enlarge buffer")
	}
}

// Should only be used for LINES types.
func NewPReader(readCloser io.ReadCloser, args *ReaderArgs) *PReader {
	r := &PReader{
		args:       args,
		buf:        bufio.NewReaderSize(readCloser, jsonSplitSize*2),
		readCloser: readCloser,
		close:      make(chan struct{}),
	}
	r.startReaders()
	return r

}

const minReadBufferSize = 16
const maxConsecutiveEmptyReads = 100

// NewReaderSize returns a new [Reader] whose buffer has at least the specified
// size. If the argument io.Reader is already a [Reader] with large enough
// size, it returns the underlying [Reader].
func NewReaderSize(rd io.Reader, size int) *Reader {
	// Is it already a Reader?
	b, ok := rd.(*Reader)
	if ok && len(b.buf) >= size {

			recordDelimiter: []byte(args.RecordDelimiter),
			oneByte:         make([]byte, len(args.RecordDelimiter)-1),
		}
	}

	r := &Reader{
		args:       args,
		buf:        bufio.NewReaderSize(csvIn, csvSplitSize*2),
		readCloser: readCloser,
		close:      make(chan struct{}),
	}

	// Assume args are validated by ReaderArgs.UnmarshalXML()
	newCsvReader := func(r io.Reader) *csv.Reader {

// The reader will be buffered.
// Return with readMsgpReaderPoolPut when done.
func msgpNewReader(r io.Reader) *msgp.Reader {
	p := readMsgpReaderPool.Get().(*msgp.Reader)
	if p.R == nil {
		p.R = xbufio.NewReaderSize(r, 32<<10)
	} else {
		p.R.Reset(r)
	}
	return p
}

// readMsgpReaderPoolPut can be used to reuse a *msgp.Reader.
func readMsgpReaderPoolPut(r *msgp.Reader) {
	if r != nil {

			in := io.Reader(hashReader)
			if size > encryptBufferThreshold {
				// The encryption reads in blocks of 64KB.
				// We add a buffer on bigger files to reduce the number of syscalls upstream.
				in = bufio.NewReaderSize(hashReader, encryptBufferSize)
			}

			var nonce [12]byte
			tmp := sha256.Sum256([]byte(fmt.Sprint(uploadID, partID)))
			copy(nonce[:], tmp[:12])

			reader, err = sio.EncryptReader(in, sio.Config{

	if r.ContentLength > encryptBufferThreshold {
		// The encryption reads in blocks of 64KB.
		// We add a buffer on bigger files to reduce the number of syscalls upstream.
		content = bufio.NewReaderSize(content, encryptBufferSize)
	}

	var (
		key   []byte
		keyID string
		ctx   kms.Context
		err   error
	)
	kind, _ := crypto.IsRequested(r.Header)
	if kind == crypto.SSEC {

						cFns[i]()
					}
					return nil, err
				}
			}

			decReader := io.LimitReader(s2Reader, decLength)
			if decLength > compReadAheadSize {
				rah, err := readahead.NewReaderSize(decReader, compReadAheadBuffers, compReadAheadBufSize)
				if err == nil {
					decReader = rah
					cFns = append([]func(){func() {
						rah.Close()
					}}, cFns...)
				}
			}
			oi.Size = decLength