code: public byte[] ensureBufferHasCapacityLeft(int size) throws FileParsingException {
      if (bytesHolder == null) {
        bytesHolder = new ByteArrayHolder(size);
      } else {
        bytesHolder.ensureHasSpace(size);
      }
      return bytesHolder.getUnderlyingBytes();
    }
docs: Ensure, that the output data buffer has enough space left for {@code size} mode bytes.
  
  @return the output buffer