svoid bcelFixZip2Zip(File inZip, File outZip) {
  Zip2Zip z2z = new(inZip, outZip);
  z2z.copyFileContents = (name, in, out) -> {
    if (endsWith(name, ".class"))
      bcelRoundtrip(in, name, out);
    else
      copyStream(in, out);
  };
  z2z.run();
}