checkNotNull(target);
      checkPositionIndexes(off, off + len, bytes.length);
      for (int i = 0; i < len; i += alphabet.bytesPerChunk) {
        encodeChunkTo(target, bytes, off + i, Math.min(alphabet.bytesPerChunk, len - i));
      }
    }

    void encodeChunkTo(Appendable target, byte[] bytes, int off, int len) throws IOException {
      checkNotNull(target);
      checkPositionIndexes(off, off + len, bytes.length);