Update vendor/

vendor/github.com/emersion/go-message/encoding.go

@@ -0,0 +1,47 @@
+package message
+
+import (
+	"encoding/base64"
+	"fmt"
+	"io"
+	"mime/quotedprintable"
+	"strings"
+
+	"github.com/emersion/go-textwrapper"
+)
+
+func encodingReader(enc string, r io.Reader) (io.Reader, error) {
+	var dec io.Reader
+	switch strings.ToLower(enc) {
+	case "quoted-printable":
+		dec = quotedprintable.NewReader(r)
+	case "base64":
+		dec = base64.NewDecoder(base64.StdEncoding, r)
+	case "7bit", "8bit", "binary", "":
+		dec = r
+	default:
+		return nil, fmt.Errorf("unhandled encoding %q", enc)
+	}
+	return dec, nil
+}
+
+type nopCloser struct {
+	io.Writer
+}
+
+func (nopCloser) Close() error { return nil }
+
+func encodingWriter(enc string, w io.Writer) io.WriteCloser {
+	var wc io.WriteCloser
+	switch strings.ToLower(enc) {
+	case "quoted-printable":
+		wc = quotedprintable.NewWriter(w)
+	case "base64":
+		wc = base64.NewEncoder(base64.StdEncoding, textwrapper.NewRFC822(w))
+	case "7bit", "8bit":
+		wc = nopCloser{textwrapper.New(w, "\r\n", 1000)}
+	default: // "binary"
+		wc = nopCloser{w}
+	}
+	return wc
+}