package cursor

import (
	"io"
)

// BufferedReaderAt uses a buffer to supplement an io.Reader
// with limited backward seeking.
type BufferedReaderAt struct{}

func NewBufferedReaderAt(r io.Reader, minBuffer uint64) *BufferedReaderAt {
	return nil
}

// ReadAt reads bytes from the underlying reader. If the offset is after
// the end of the buffer, ReadAt will first read and ignore bytes from the
// underlying reader until it reaches the offset. If the offset is
// before the start of the buffer, ReadAt will return an error.
//
// If your parser needs unlimited lookahead, you should probably
// just read the whole input into a slice and use BytesCursor.
func (b *BufferedReaderAt) ReadAt(dst []byte, offset int64) (int, error) {
	return 0, nil
}