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zip_set_file_compression.mdoc -- set compression method and its flags
Copyright (C) 2012-2019 Dieter Baron and Thomas Klausner
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<title>ZIP_SET_FILE_COMPRESSION(3)</title>
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<table class="head">
<tr>
<td class="head-ltitle">ZIP_SET_FILE_COMPRESSION(3)</td>
<td class="head-vol">Library Functions Manual</td>
<td class="head-rtitle">ZIP_SET_FILE_COMPRESSION(3)</td>
</tr>
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<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<code class="Nm">zip_set_file_compression</code> —
<div class="Nd">set compression method for file in zip</div>
</section>
<section class="Sh">
<h1 class="Sh" id="LIBRARY"><a class="permalink" href="#LIBRARY">LIBRARY</a></h1>
libzip (-lzip)
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<code class="In">#include <<a class="In">zip.h</a>></code>
<p class="Pp"><var class="Ft">int</var>
<br/>
<code class="Fn">zip_set_file_compression</code>(<var class="Fa" style="white-space: nowrap;">zip_t
*archive</var>, <var class="Fa" style="white-space: nowrap;">zip_uint64_t
index</var>, <var class="Fa" style="white-space: nowrap;">zip_int32_t
comp</var>, <var class="Fa" style="white-space: nowrap;">zip_uint32_t
comp_flags</var>);</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
The <code class="Fn">zip_set_file_compression</code>() function sets the
compression method for the file at position <var class="Ar">index</var> in the
zip archive to <var class="Ar">comp</var> with the compression method specific
<var class="Ar">comp_flags</var>. The <var class="Ar">comp</var> is the same
as returned by <a class="Xr" href="zip_stat.html">zip_stat(3)</a>. For the
<var class="Ar">comp</var> argument, currently only the following values are
supported:
<dl class="Bl-tag">
<dt><a class="permalink" href="#ZIP_CM_DEFAULT"><code class="Dv" id="ZIP_CM_DEFAULT">ZIP_CM_DEFAULT</code></a></dt>
<dd>default compression; currently the same as
<code class="Dv">ZIP_CM_DEFLATE</code>, but <var class="Ar">flags</var>
are ignored.</dd>
<dt><a class="permalink" href="#ZIP_CM_STORE"><code class="Dv" id="ZIP_CM_STORE">ZIP_CM_STORE</code></a></dt>
<dd>Store the file uncompressed.</dd>
<dt><a class="permalink" href="#ZIP_CM_BZIP2"><code class="Dv" id="ZIP_CM_BZIP2">ZIP_CM_BZIP2</code></a></dt>
<dd>Compress the file using the <a class="Xr" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/bzip2.html">bzip2(1)</a>
algorithm.</dd>
<dt><a class="permalink" href="#ZIP_CM_DEFLATE"><code class="Dv" id="ZIP_CM_DEFLATE">ZIP_CM_DEFLATE</code></a></dt>
<dd>Deflate the file with the <a class="Xr" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/zlib.html">zlib(3)</a>
algorithm and default options.</dd>
</dl>
<p class="Pp"><i class="Em">NOTE</i>: Only the deflate and store methods can be
assumed to be universally supported.</p>
<p class="Pp">The <var class="Ar">comp_flags</var> argument defines the
compression level, 1 being fastest compression and 9 highest. Allowed values
are 0 (which uses the default compression for the algorithm) and 1-9, other
values are undefined. Further compression method specific flags might be
added over time.</p>
<p class="Pp">The current compression method for a file in a zip archive can be
determined using <a class="Xr" href="zip_stat.html">zip_stat(3)</a>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
VALUES</a></h1>
Upon successful completion 0 is returned. Otherwise, -1 is 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" href="#ZIP_ER_INVAL"><code class="Er" id="ZIP_ER_INVAL">ZIP_ER_INVAL</code></a>]</dt>
<dd><var class="Ar">index</var> is not a valid file index in
<var class="Ar">archive</var>, or the argument combination is
invalid.</dd>
<dt>[<a class="permalink" href="#ZIP_ER_RDONLY"><code class="Er" id="ZIP_ER_RDONLY">ZIP_ER_RDONLY</code></a>]</dt>
<dd>Read-only zip file, no changes allowed.</dd>
</dl>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
ALSO</a></h1>
<a class="Xr" href="libzip.html">libzip(3)</a>,
<a class="Xr" href="zip_compression_method_supported.html">zip_compression_method_supported(3)</a>,
<a class="Xr" href="zip_stat.html">zip_stat(3)</a>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<code class="Fn">zip_set_file_compression</code>() was added in libzip 0.11.
</section>
<section class="Sh">
<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
<span class="An">Dieter Baron</span>
<<a class="Mt" href="mailto:[email protected]">[email protected]</a>> and
<span class="An">Thomas Klausner</span>
<<a class="Mt" href="mailto:[email protected]">[email protected]</a>>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">April 2, 2020</td>
<td class="foot-os">NiH</td>
</tr>
</table>
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