in encode/java/src/main/java/com/aliyun/darabonba/encode/Encoder.java [190:197]
public String encode(byte[] src) throws UnsupportedEncodingException {
int len = encodeOutLength(src.length); // dst array size
byte[] dst = new byte[len];
int ret = encode0(src, 0, src.length, dst);
if (ret != dst.length)
return new String(Arrays.copyOf(dst, ret), ENCODING);
return new String(dst, ENCODING);
}