func writeQ(buf *bytes.Buffer, b byte) {
switch {
case b == ' ':
buf.WriteByte('_')
case b >= '!' && b <= '~' && b != '=' && b != '?' && b != '_':
buf.WriteByte(b)
default:
enc := make([]byte, 3)
internal.EncodeByte(enc, b)
buf.Write(enc)
}
}
// Encode encodes src into at most MaxEncodedLen(len(src)) bytes to dst,
// returning the actual number of bytes written to dst.
func Encode(dst, src []byte) int {
n := 0
for i, c := range src {
switch {
case c != '=' && (c >= '!' && c <= '~' || c == '\n' || c == '\r'):
dst[n] = c
n++
case c == ' ' || c == '\t':
if isLastChar(i, src) {
internal.EncodeByte(dst[n:], c)
n += 3
} else {
dst[n] = c
n++
}
default:
internal.EncodeByte(dst[n:], c)
n += 3
}
}
return n
}