 <code>:external_encoding</code> and transcoded to <code>:internal_encoding</code> using <code>:transcode_options</code> after decompressing.</p>

<pre class="ruby"><span class="ruby-comment">#set_encoding(external_encoding, internal_encoding, transcode_options)</span>
</pre>

<p>Set another encodings.</p>

<pre class="ruby"><span class="ruby-comment">#io</span>
<span class="ruby-comment">#to_io</span>
<span class="ruby-comment">#stat</span>
<span class="ruby-comment">#external_encoding</span>
<span class="