code: public byte[] getBytes(int index, int length)
      {
          byte[] bytes = new byte[length];
          getBytes(index, bytes, 0, length);
          return bytes;
      }
docs: Returns a copy of this buffer as a byte array.
  
  @param index the absolute index to start at
  @param length the number of bytes to return
  @throws IndexOutOfBoundsException if the specified {@code index} is less then {@code 0},
  or if the specified {@code index + length} is greater than {@code this.length()}