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zip_file_extra_field_set.mdoc -- set extra field for file in zip
Copyright (C) 2012-2017 Dieter Baron and Thomas Klausner
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<title>ZIP_FILE_EXTRA_FIELD_SET(3)</title>
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<table class="head">
<tr>
<td class="head-ltitle">ZIP_FILE_EXTRA_FIELD_SET(3)</td>
<td class="head-vol">Library Functions Manual</td>
<td class="head-rtitle">ZIP_FILE_EXTRA_FIELD_SET(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_file_extra_field_set</code> —
<div class="Nd">set extra field 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_file_extra_field_set</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_uint16_t
extra_field_id</var>,
<var class="Fa" style="white-space: nowrap;">zip_uint16_t
extra_field_index</var>, <var class="Fa" style="white-space: nowrap;">const
zip_uint8_t *extra_field_data</var>,
<var class="Fa" style="white-space: nowrap;">zip_uint16_t len</var>,
<var class="Fa" style="white-space: nowrap;">zip_flags_t 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_file_extra_field_set</code>() function sets the extra
field with ID (two-byte signature) <var class="Ar">extra_field_id</var> and
index <var class="Ar">extra_field_index</var> for the file at position
<var class="Ar">index</var> in the zip archive. The extra field's data will be
set to <var class="Ar">extra_field_data</var> and length
<var class="Ar">len</var>. If a new entry shall be appended, set
<var class="Ar">extra_field_index</var> to
<code class="Dv">ZIP_EXTRA_FIELD_NEW</code>.
<p class="Pp">At least one of the following <var class="Ar">flags</var> must be
set:</p>
<div class="Bd-indent">
<dl class="Bl-tag">
<dt><a class="permalink" href="#ZIP_FL_CENTRAL"><code class="Dv" id="ZIP_FL_CENTRAL">ZIP_FL_CENTRAL</code></a></dt>
<dd>Set extra field in the archive's central directory.</dd>
<dt><a class="permalink" href="#ZIP_FL_LOCAL"><code class="Dv" id="ZIP_FL_LOCAL">ZIP_FL_LOCAL</code></a></dt>
<dd>Set extra field in the local file headers.</dd>
</dl>
</div>
<p class="Pp">Please note that the extra field IDs 0x0001 (ZIP64 extension),
0x6375 (Infozip UTF-8 comment), and 0x7075 (Infozip UTF-8 file name) can not
be set using <code class="Fn">zip_file_extra_field_set</code>() since they
are set by <a class="Xr" href="libzip.html">libzip(3)</a> automatically when
needed.</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 code 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_file_extra_field_set</code>() fails if:
<dl class="Bl-tag">
<dt>[<a class="permalink" href="#ZIP_ER_INVAL"><code class="Er" id="ZIP_ER_INVAL">ZIP_ER_INVAL</code></a>]</dt>
<dd>The extra field size is too large (ID and length need 4 bytes; the maximum
length of all extra fields for one file combined is 65536 bytes). This
error also occurs if <var class="Ar">extra_field_index</var> is too
large.</dd>
<dt>[<a class="permalink" href="#ZIP_ER_MEMORY"><code class="Er" id="ZIP_ER_MEMORY">ZIP_ER_MEMORY</code></a>]</dt>
<dd>Required memory could not be allocated.</dd>
<dt>[<a class="permalink" href="#ZIP_ER_NOENT"><code class="Er" id="ZIP_ER_NOENT">ZIP_ER_NOENT</code></a>]</dt>
<dd><var class="Ar">index</var> is not a valid file index in
<var class="Ar">archive</var>.</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_file_extra_field_delete.html">zip_file_extra_field_delete(3)</a>,
<a class="Xr" href="zip_file_extra_field_get.html">zip_file_extra_field_get(3)</a>,
<a class="Xr" href="zip_file_extra_fields_count.html">zip_file_extra_fields_count(3)</a>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<code class="Fn">zip_file_extra_field_set</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">December 18, 2017</td>
<td class="foot-os">NiH</td>
</tr>
</table>
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