go/src/mime/quotedprintable/writer.go

const lineMaxLen …

type Writer …

// NewWriter returns a new [Writer] that writes to w.
func NewWriter(w io.Writer) *Writer { … }

// Write encodes p using quoted-printable encoding and writes it to the
// underlying [io.Writer]. It limits line length to 76 characters. The encoded
// bytes are not necessarily flushed until the [Writer] is closed.
func (w *Writer) Write(p []byte) (n int, err error) { … }

// Close closes the [Writer], flushing any unwritten data to the underlying
// [io.Writer], but does not close the underlying io.Writer.
func (w *Writer) Close() error { … }

// write limits text encoded in quoted-printable to 76 characters per line.
func (w *Writer) write(p []byte) error { … }

func (w *Writer) encode(b byte) error { … }

const upperhex …

// checkLastByte encodes the last buffered byte if it is a space or a tab.
func (w *Writer) checkLastByte() error { … }

func (w *Writer) insertSoftLineBreak() error { … }

func (w *Writer) insertCRLF() error { … }

func (w *Writer) flush() error { … }

func isWhitespace(b byte) bool { … }