static File lcCompressFilePart_upper(File file, long startIndex, int length, O... _) {
  optPar bool balancing = true;
  optPar bool verbose;
  
  print("Compressing " + file);
  new LineCompCompressor compressor;
  compressor.byteMode = true;
  compressor.toUpper = true;
  if (byteMode) print("byte mode");
  if (toUpper) print("toUpper mode");
  compressor.verboseCompressionSteps = print(+verbose);
  compressor.balancing = true;
  if (compressor.balancing) print("balancing mode");
  compressor.verify = false;
  compressor.verboseStats = true;
  compressor.loadTexts(litmap(str(startIndex) := loadTextFilePart_rawBytes(file, startIndex, startIndex+length));
  compressor.run();
  File archiveFile = appendToFileName(file, ".ubc");
  lcSaveToFile(compressor, archiveFile);
  ret archiveFile;
}