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<?xml version="1.0" encoding="UTF-8"?>
<section id="zlib"><title>Interface to zlib</title>
<para>This is an &ffi-pac;-based interface to the &zlib-link;.</para>
<simpara>When this module is present, &features-my;
contains the symbol <constant>:ZLIB</constant>.</simpara>
<variablelist>
<varlistentry><term><code>(ZLIB:Z-VERSION)</code></term>
<listitem><simpara>Return the string version of the underlying library.
</simpara></listitem></varlistentry>
<varlistentry><term><code>(ZLIB:COMPRESS source &key-amp; level)</code></term>
<listitem><simpara>Compress the &source-r; &vector-t;.
</simpara></listitem></varlistentry>
<varlistentry><term><code>(ZLIB:UNCOMPRESS
source destination-length)</code></term>
<listitem><simpara>Uncompress the &source-r; &vector-t; (returned
by <function>ZLIB:COMPRESS</function>).
<replaceable>destination-length</replaceable> should be no less than
the length of the uncompressed &source-r;.
</simpara></listitem></varlistentry>
<varlistentry><term><code>(ZLIB:COMPRESS-BOUND source-length)</code></term>
<listitem><simpara>Return the maximum length of the return value
of <function>ZLIB:COMPRESS</function>.</simpara></listitem></varlistentry>
<varlistentry><term><code>(ZLIB:ERROR-STRING &ecode-r;)</code></term>
<listitem><simpara>Return a descriptive string for the supplied &ecode-r;.
</simpara></listitem></varlistentry>
<varlistentry><term><classname>ZLIB:ZERROR</classname></term>
<listitem><simpara>An &error-t; sometimes &signal;ed
by <function>ZLIB:COMPRESS</function>
and <function>ZLIB:UNCOMPRESS</function>.
You can find the error code and the caller
using <function>ZLIB:ZERROR-ERRNO</function>
and <function>ZLIB:ZERROR-CALLER</function>.
</simpara></listitem></varlistentry>
</variablelist>
</section>
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