code: public long skip(long bytes) throws IOException {
          long pos = randomFile.getFilePointer();
          randomFile.seek(pos + bytes);
          return randomFile.getFilePointer() - pos;
      }
docs: Skip bytes in the input file.
  @param bytes The number of bytes to skip
  @return the number of bytes skiped
  @throws IOException on IO error
  @see java.io.InputStream#skip(long)