sclass LineCompSemiCached implements AutoCloseable {
  File f; // must be the raw text version
  RandomAccessFile raf;
  int[] literalOffsets;
  int[] pairs;
  Map<S, int[]> files;
  S encoding = "UTF-8";
  
  *(File *f) {
    if (isGZipFile(f)) fail("Must not be gzipped: " + f2s(f));
    LineCompReader reader = new(f);
    literalOffsets = reader.literalOffsets;
    pairs = intPairsToIntArray(reader.pairs);
    files = mapValues toIntArray(reader.versions);
    raf = randomAccessFileForReading(f);
  }
  
  S getLiteral(int i) {
    int start = literalOffsets[i];
    ret bytesToString(raf_readFilePart(raf, start, literalOffsets[i+1]-start), encoding);
  }
  
  public void close ctex {
    if (raf != null) raf.close();
  }
}