 a GIF decoder should verify that the image contains the GIF header block.

 <p>Decoders that return <code>true</code> from <code>handles</code> may still return <code>null</code> from
 <a href="../../../../../../com/bumptech/glide/load/ResourceDecoder.html#decode-T-int-int-com.bumptech.glide.load.Options-"><code>ResourceDecoder.decode(Object, int, int, Options)</code></a> if the data is partial or formatted incorrectly.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><