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<!-- This is an automatically generated file. Do not edit.
zip_source_file.mdoc -- create data source from a file
Copyright (C) 2004-2021 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
The authors can be contacted at <info@libzip.org>
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<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<link rel="stylesheet" href="../nih-man.css" type="text/css" media="all"/>
<title>ZIP_SOURCE_FILE(3)</title>
</head>
<body>
<table class="head">
<tr>
<td class="head-ltitle">ZIP_SOURCE_FILE(3)</td>
<td class="head-vol">Library Functions Manual</td>
<td class="head-rtitle">ZIP_SOURCE_FILE(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_source_file</code>,
<code class="Nm">zip_source_file_create</code> —
<span class="Nd">create data source from a file</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_source_t *</var>
<br/>
<code class="Fn">zip_source_file</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_uint64_t
start</var>, <var class="Fa" style="white-space: nowrap;">zip_int64_t
len</var>);</p>
<p class="Pp"><var class="Ft">zip_source_t *</var>
<br/>
<code class="Fn">zip_source_file_create</code>(<var class="Fa" style="white-space: nowrap;">const
char *fname</var>, <var class="Fa" style="white-space: nowrap;">zip_uint64_t
start</var>, <var class="Fa" style="white-space: nowrap;">zip_int64_t
len</var>, <var class="Fa" style="white-space: nowrap;">zip_error_t
*error</var>);</p>
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
<p class="Pp">The functions
<a class="permalink" href="#zip_source_file"><code class="Fn" id="zip_source_file">zip_source_file</code></a>()
and
<a class="permalink" href="#zip_source_file_create"><code class="Fn" id="zip_source_file_create">zip_source_file_create</code></a>()
create a zip source from a file. They open <var class="Ar">fname</var> and
read <var class="Ar">len</var> bytes from offset <var class="Ar">start</var>
from it.</p>
<p class="Pp">When passing <code class="Dv">ZIP_LENGTH_TO_END</code> (or -1,
which is deprecated) as <var class="Ar">len</var>,
<code class="Nm">zip_source_file</code> determines the file size when it is
called and uses that as the expected file size. If the file size grows
between creating and reading from the source, the additional data is
ignored. If the file shrinks, <code class="Nm">libzip</code> treats it as an
error (<code class="Dv">ZIP_ER_DATA_LENGTH</code>).</p>
<p class="Pp">When passing <code class="Dv">ZIP_LENGTH_UNCHECKED</code> as
<var class="Ar">len</var>, <code class="Nm">zip_source_file</code> assumes
the file's size is unknown. Reading from the source returns as much data as
is there at that time (usually when calling
<a class="Xr" href="zip_close.html">zip_close(3)</a>).</p>
<p class="Pp"><code class="Nm">libzip</code> can do various optimizations if the
size of a source is known when it's created, so
<code class="Dv">ZIP_LENGTH_TO_END</code> is preferable. If you deal with
files that are likely to change while you are processing them, you can use
the less efficient <code class="Dv">ZIP_LENGTH_UNCHECKED</code>.</p>
<p class="Pp">If the file supports seek, the source can be used to open a zip
archive from.</p>
<p class="Pp" id="zip_close">The file is opened and read when the data from the
source is used, usually by
<a class="permalink" href="#zip_close"><code class="Fn">zip_close</code></a>()
or
<a class="permalink" href="#zip_open_from_source"><code class="Fn" id="zip_open_from_source">zip_open_from_source</code></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, the created source is returned.
Otherwise, <code class="Dv">NULL</code> is returned and the error code in
<var class="Ar">archive</var> or <var class="Ar">error</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>
<p class="Pp"><code class="Fn">zip_source_file</code>() and
<code class="Fn">zip_source_file_create</code>() fail if:</p>
<dl class="Bl-tag">
<dt id="ZIP_ER_INVAL">[<a class="permalink" href="#ZIP_ER_INVAL"><code class="Er">ZIP_ER_INVAL</code></a>]</dt>
<dd><var class="Ar">fname</var>, <var class="Ar">start</var>, or
<var class="Ar">len</var> are invalid.</dd>
<dt id="ZIP_ER_MEMORY">[<a class="permalink" href="#ZIP_ER_MEMORY"><code class="Er">ZIP_ER_MEMORY</code></a>]</dt>
<dd>Required memory could not be allocated.</dd>
<dt id="ZIP_ER_OPEN">[<a class="permalink" href="#ZIP_ER_OPEN"><code class="Er">ZIP_ER_OPEN</code></a>]</dt>
<dd>Opening <var class="Ar">fname</var> failed.</dd>
</dl>
</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_file_add.html">zip_file_add(3)</a>,
<a class="Xr" href="zip_file_replace.html">zip_file_replace(3)</a>,
<a class="Xr" href="zip_source.html">zip_source(5)</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_source_file</code>() and
<code class="Fn">zip_source_file_create</code>() were added in libzip
1.0.</p>
<p class="Pp"><code class="Dv">ZIP_LENGTH_TO_END</code> and
<code class="Dv">ZIP_LENGTH_UNCHECKED</code> were added in libzip
1.10.1.</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>
</div>
<table class="foot">
<tr>
<td class="foot-date">June 30, 2023</td>
<td class="foot-os">NiH</td>
</tr>
</table>
</body>
</html>
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