// AddText applies quoted-printable encoding to the content of r before writing
// the encoded result in a new sub-part with media MIME type set to mediaType.
//
// Specifying the charset in the mediaType string is recommended
// ("plain/text; charset=utf-8").
func (p *Multipart) AddText(mediaType string, r io.Reader) error {
if p.isClosed {
return ErrPartClosed
}
p.header = textproto.MIMEHeader(map[string][]string{
"Content-Type": {mediaType},
"Content-Transfer-Encoding": {"quoted-printable"},
})
w, err := p.writer.CreatePart(p.header)
if err != nil {
return err
}
reader := bufio.NewReader(r)
encoder := qp.NewWriter(w)
defer encoder.Close()
buffer := make([]byte, maxLineLen)
for {
read, err := reader.Read(buffer[:])
if err != nil {
if err != io.EOF {
return err
}
break
}
encoder.Write(buffer[:read])
}
fmt.Fprintf(w, crlf)
fmt.Fprintf(w, crlf)
return nil
}
func (p *Multipart) AddText(mediaType string, txt string) error {
if p.isClosed {
return ErrPartClosed
}
p.header = textproto.MIMEHeader(map[string][]string{
"Content-Type": {mediaType},
"Content-Transfer-Encoding": {"quoted-printable"},
})
w, err := p.writer.CreatePart(p.header)
if err != nil {
return err
}
encoder := qp.NewWriter(w)
_, err = io.WriteString(encoder, txt)
if err != nil {
return err
}
encoder.Close()
fmt.Fprintf(w, crlf)
fmt.Fprintf(w, crlf)
return nil
}
func qpString(txt string) string {
buf := bytes.NewBufferString("=?utf-8?q?")
w := qp.NewWriter(buf)
io.WriteString(w, txt)
w.Close()
buf.WriteString("?=")
return buf.String()
}
func qpStringWithGB2312(txt string) string {
buf := bytes.NewBufferString("=?GB2312?Q?")
bs, _, e := transform.Bytes(simplifiedchinese.GB18030.NewEncoder(), []byte(txt))
if nil != e {
return qpString(txt)
}
w := qp.NewWriter(buf)
w.Write(bs)
w.Close()
buf.WriteString("?=")
return buf.String()
}