8079841: Buffer underflow with empty zip entry names
Summary: check for zero-length entry name before accessing "last" byte
Reviewed-by: sherman, martin
<blockquote>
<h2 id="thisisaheader">This is a header.</h2>
<ol>
<li>This is the first list item.</li>
<li>This is the second list item.</li>
</ol>
<p>Here's some example code:</p>
<pre><code>return shell_exec("echo $input | $markdown_script");
</code></pre>
</blockquote>