func newPart(mr *Reader) (*Part, error) {
bp := &Part{
Header: make(map[string][]string),
mr: mr,
buffer: new(bytes.Buffer),
}
err := bp.populateHeaders()
bp.r = partReader{bp}
const cte = "Content-Transfer-Encoding"
if bp.Header.Get(cte) == "quoted-printable" {
bp.Header.Del(cte)
bp.r = quotedprintable.NewReader(bp.r)
}
return bp, err
}
// decodeSection attempts to decode the data from reader using the algorithm listed in
// the Content-Transfer-Encoding header, returning the raw data if it does not known
// the encoding type.
func decodeSection(encoding string, reader io.Reader) ([]byte, error) {
// Default is to just read input into bytes
decoder := reader
switch strings.ToLower(encoding) {
case "quoted-printable":
decoder = quotedprintable.NewReader(reader)
case "base64":
// cleaner := NewBase64Cleaner(reader)
// decoder = base64.NewDecoder(base64.StdEncoding, cleaner)
decoder = NewBase64Combiner(reader)
case "uuencode":
decoder = transform.NewReader(reader, uuencode.NewDecFirstOne())
}
// Read bytes into buffer
buf := new(bytes.Buffer)
_, err := buf.ReadFrom(decoder)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}