docs: public String getFirstBytesAsHexString(int length) {
      CloseableReference<PooledByteBuffer> imageBuffer = getByteBufferRef();
      if (imageBuffer == null) {
        return "";
      }
      int imageSize = getSize();
      int resultSampleSize = Math.min(imageSize, length);
      byte[] bytesBuffer = new byte[resultSampleSize];
      try {
        PooledByteBuffer pooledByteBuffer = imageBuffer.get();
        if (pooledByteBuffer == null) {
          return "";
        }
        pooledByteBuffer.read(0, bytesBuffer, 0, resultSampleSize);
      } finally {
        imageBuffer.close();
      }
      StringBuilder stringBuilder = new StringBuilder(bytesBuffer.length * 2);
      for (byte b : bytesBuffer) {
        stringBuilder.append(String.format("%02X", b));
      }
      return stringBuilder.toString();
    }