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<!-- This is an automatically generated file. Do not edit.
zip_fopen_encrypted.mdoc -- open encrypted file in zip archive for reading
Copyright (C) 2011-2021 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
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<link rel="stylesheet" href="../nih-man.css" type="text/css" media="all"/>
<title>ZIP_FOPEN_ENCRYPTED(3)</title>
</head>
<body>
<table class="head">
<tr>
<td class="head-ltitle">ZIP_FOPEN_ENCRYPTED(3)</td>
<td class="head-vol">Library Functions Manual</td>
<td class="head-rtitle">ZIP_FOPEN_ENCRYPTED(3)</td>
</tr>
</table>
<div class="manual-text">
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<p class="Pp"><code class="Nm">zip_fopen_encrypted</code>,
<code class="Nm">zip_fopen_index_encrypted</code> —
<span class="Nd">open encrypted file in zip archive for reading</span></p>
</section>
<section class="Sh">
<h1 class="Sh" id="LIBRARY"><a class="permalink" href="#LIBRARY">LIBRARY</a></h1>
<p class="Pp">libzip (-lzip)</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<p class="Pp"><code class="In">#include
<<a class="In">zip.h</a>></code></p>
<p class="Pp"><var class="Ft">zip_file_t *</var>
<br/>
<code class="Fn">zip_fopen_encrypted</code>(<var class="Fa" style="white-space: nowrap;">zip_t
*archive</var>, <var class="Fa" style="white-space: nowrap;">const char
*fname</var>, <var class="Fa" style="white-space: nowrap;">zip_flags_t
flags</var>, <var class="Fa" style="white-space: nowrap;">const char
*password</var>);</p>
<p class="Pp"><var class="Ft">zip_file_t *</var>
<br/>
<code class="Fn">zip_fopen_index_encrypted</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_flags_t
flags</var>, <var class="Fa" style="white-space: nowrap;">const char
*password</var>);</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The
<a class="permalink" href="#zip_fopen_encrypted"><code class="Fn" id="zip_fopen_encrypted">zip_fopen_encrypted</code></a>()
function opens the encrypted file name <var class="Ar">fname</var> in
<var class="Ar">archive</var> using the password given in the
<var class="Ar">password</var> argument. If <var class="Ar">password</var>
is <code class="Dv">NULL</code> or the empty string, the default password is
used (see
<a class="Xr" href="zip_set_default_password.html">zip_set_default_password(3)</a>).
The <var class="Ar">flags</var> argument are the same as for
<a class="Xr" href="zip_fopen.html">zip_fopen(3)</a>.</p>
<p class="Pp" id="zip_fopen_index_encrypted">The
<a class="permalink" href="#zip_fopen_index_encrypted"><code class="Fn">zip_fopen_index_encrypted</code></a>()
function opens the file at position <var class="Ar">index</var>, see
<a class="Xr" href="zip_fopen_index.html">zip_fopen_index(3)</a>. These
functions are called automatically by
<a class="Xr" href="zip_fopen.html">zip_fopen(3)</a>; you only need to call
them if you want to specify a non-default password (see
<a class="Xr" href="zip_set_default_password.html">zip_set_default_password(3)</a>).</p>
</section>
<section class="Sh">
<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
VALUES</a></h1>
<p class="Pp">Upon successful completion, a <var class="Ft">struct
zip_file</var> pointer is returned. Otherwise, <code class="Dv">NULL</code>
is returned and the error code in <var class="Ar">archive</var> is set to
indicate the error.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="ERRORS"><a class="permalink" href="#ERRORS">ERRORS</a></h1>
<dl class="Bl-tag">
<dt id="ZIP_ER_NOPASSWD">[<a class="permalink" href="#ZIP_ER_NOPASSWD"><code class="Er">ZIP_ER_NOPASSWD</code></a>]</dt>
<dd>No password was provided.</dd>
</dl>
<p class="Pp">The function <code class="Fn">zip_fopen_encrypted</code>() may
also fail and set <var class="Va">zip_err</var> for any of the errors
specified for the routine
<a class="Xr" href="zip_fopen.html">zip_fopen(3)</a>.</p>
<p class="Pp">The function <code class="Fn">zip_fopen_index_encrypted</code>()
may also fail and set <var class="Va">zip_err</var> for any of the errors
specified for the routine
<a class="Xr" href="zip_fopen_index.html">zip_fopen_index(3)</a>.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
ALSO</a></h1>
<p class="Pp"><a class="Xr" href="libzip.html">libzip(3)</a>,
<a class="Xr" href="zip_fclose.html">zip_fclose(3)</a>,
<a class="Xr" href="zip_fopen.html">zip_fopen(3)</a>,
<a class="Xr" href="zip_fread.html">zip_fread(3)</a>,
<a class="Xr" href="zip_get_num_entries.html">zip_get_num_entries(3)</a>,
<a class="Xr" href="zip_name_locate.html">zip_name_locate(3)</a></p>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<p class="Pp"><code class="Fn">zip_fopen_encrypted</code>() and
<code class="Fn">zip_fopen_index_encrypted</code>() were added in libzip
1.0.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
<p class="Pp"><span class="An">Dieter Baron</span>
<<a class="Mt" href="mailto:dillo@nih.at">dillo@nih.at</a>> and
<span class="An">Thomas Klausner</span>
<<a class="Mt" href="mailto:wiz@gatalith.at">wiz@gatalith.at</a>></p>
</section>
<section class="Sh">
<h1 class="Sh" id="CAVEATS"><a class="permalink" href="#CAVEATS">CAVEATS</a></h1>
<p class="Pp">The zip file format provides very limited possibility for password
verification (a short hash of is compared against one byte in the zip
archive). For this reason, reading a file while using an incorrect password
may immediately fail with <code class="Er">ZIP_ER_WRONGPASSWD</code>, but if
the mismatch is not detected, a zlib error may be returned later instead.
Since zlib errors can also be caused by broken compressed data, there is no
way to make sure if the password was incorrect or if it was correct, but the
compressed data was invalid.</p>
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">September 15, 2020</td>
<td class="foot-os">NiH</td>
</tr>
</table>
</body>
</html>
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