func detectTextHeader(header textproto.MIMEHeader, emptyContentTypeIsText bool) bool {
	ctype := header.Get(hnContentType)
	if ctype == "" && emptyContentTypeIsText {
		return true
	}

	mediatype, _, _, err := parseMediaType(ctype)
	if err != nil {
		return false
	}
	switch mediatype {
	case ctTextPlain, ctTextHTML:
		return true
	}

	return false
}
func detectTextHeader(header textproto.MIMEHeader, emptyContentTypeIsText bool) bool {
	ctype := header.Get(hnContentType)
	if ctype == "" && emptyContentTypeIsText {
		return true
	}

	mediatype, _, _, err := parseMediaType(ctype)
	if err != nil {
		return false
	}
	switch mediatype {
	case ctTextPlain, ctTextHTML:
		return true
	}

	return false
}
func detectTextHeader ( header textproto . MIMEHeader , emptyContentTypeIsText bool ) bool { ctype := header . Get ( hnContentType ) if ctype == " " && emptyContentTypeIsText { return true } mediatype , _ , _ , err := parseMediaType ( ctype ) if err != nil { return false } switch mediatype { case ctTextPlain , ctTextHTML : return true } return false }
// detectTextHeader returns true, if the the MIME headers define a valid 'text/plain' or 'text/html'
// part.  If the emptyContentTypeIsPlain argument is set to true, a missing Content-Type header will
// result in a positive plain part detection.
detectTextHeader returns true if the the MIME headers define a valid text / plain or text / html part . If the emptyContentTypeIsPlain argument is set to true a missing Content - Type header will result in a positive plain part detection .