return Language(i), nil
			}
		}
		return 0, NewValueError(s)
	}
	return 0, ErrSyntax
}

// StringToBuf writes the string to b and returns the number of bytes
// written.  cap(b) must be >= 3.
func (id Language) StringToBuf(b []byte) int {
	if id >= langNoIndexOffset {
		intToStr(uint(id)-langNoIndexOffset, b[:3])
		return 3
	} else if id == 0 {
		return copy(b, "und")

// to the given buffer and returns the number of bytes written. It will never
// write more than maxCoreSize bytes.
func (t *Tag) genCoreBytes(buf []byte) int {
	n := t.LangID.StringToBuf(buf[:])
	if t.ScriptID != 0 {
		n += copy(buf[n:], "-")
		n += copy(buf[n:], t.ScriptID.String())
	}
	if t.RegionID != 0 {
		n += copy(buf[n:], "-")
		n += copy(buf[n:], t.RegionID.String())
	}