public final static byte[] encode(String str, byte[] bytbuf, int offset) { return encode(str, 0, str.length(), bytbuf, offset);
public final static byte[] encode(char[] str) {  if (null == str || 0 >= str.length) return null;  return encode(str, 0, str.length, null, 0);
	public final static byte[] encode(String str, byte[] bytbuf, int offset) {		return encode(str, 0, str.length(), bytbuf, offset);	}