s returned and the
  error information in <var class="Ar">archive</var> is set to indicate the
  error.
</section>
<section class="Sh">
<h1 class="Sh" id="ERRORS"><a class="permalink" href="#ERRORS">ERRORS</a></h1>
<code class="Fn">zip_set_file_compression</code>() fails if:
<dl class="Bl-tag">
  <dt>[<a class="permalink" href="#ZIP_ER_COMPNOTSUPP"><code class="Er" id="ZIP_ER_COMPNOTSUPP">ZIP_ER_COMPNOTSUPP</code></a>]</dt>
  <dd>Unsupported compression method requested.</dd>
  <dt>[<a class="permalink" hre