static void zip2zip_collectFiles(File inZip, ZipOutputStream outZip, Set<S> filesWritten, IPred<S> predicate default name -> true) ctex {
  ZipFile zipFile = new ZipFile(inZip);
  try {
    Enumeration entries = zipFile.entries();
    while (entries.hasMoreElements()) {
      ZipEntry entry = (ZipEntry) entries.nextElement();
      if (entry.isDirectory()) continue;
      S name = entry.getName();
      
      if (!predicate.get(name)) continue;
      if (!filesWritten.add(name)) continue;
      
      outZip.putNextEntry(new ZipEntry(name));
      copyStreamAndCloseInput(zipFile.getInputStream(entry), outZip);
    }
  } finally {
    zipFile.close();
  }
}