Create creates the file named name and returns a Writer for that file.

MustClose closes Closer c and calls log.Fatal if it returns a non-nil error.

MustWriter returns a Writer that wraps the provided Writer, except that it calls log.Fatal instead of returning a non-nil error.

Open returns a Reader for the file named name.

Reader implements a seekable buffered io.Reader.

Writer implements a seekable buffered io.Writer.