static S readChunkThroughUTF8Processor(UTF8Processor p, InputStream in, byte[] buf) ctex {
  new StringBuilder input;
  while licensed {
    int n = in.read(buf);
    if (n <= 0) break;
    for i to n:
      input.append(p.processByte(buf[i]));
  }
  ret input.toString();
}