title: Using qchecksum instead of boost crc16
body: <p>I want to take crc16 on a packet using <a href="http://doc.qt.io/qt-4.8/qbytearray.html#qChecksum" rel="nofollow">qchecksum</a> instead of <a href="http://www.boost.org/doc/libs/1_58_0/libs/crc/crc.html" rel="nofollow">boost crc</a> but I cannot take same results. how can I take crc16 checksum like boost crc in qt?</p>
  
  <pre><code>boost::crc&lt;16, 0x1040, 0, 0, false, false&gt;(packet, 4)
  </code></pre>