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<title>LuaZip: Reading files inside zip files</title>
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<div id="product_name"><big><strong>LuaZip</strong></big></div>
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<h1>LuaZip</h1>
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<h2><a name="introduction"></a>Introduction</h2>
<p>LuaZip is a lightweight <a href="http://www.lua.org">Lua</a> extension library
that can be used to read files stored inside zip files. It uses
<a href="http://zziplib.sourceforge.net">zziplib</a> to do all the hard work.</p>
<p>The API exposed to Lua is very simple and very similiar to the usual file handling
functions provided by the
<a href="http://www.lua.org/manual/5.0/manual.html#5.6">I/O Lua standard library</a>.
In fact, the API is so similar that parts of this manual are extracted from the Lua manual,
copyrighted by Tecgraf, PUC-Rio.</p>
<h2><a name="building"></a>Building</h2>
<p>
LuaZip could be built to Lua 5.0 or to Lua 5.1.
In both cases, the language library and headers files for the target version
must be installed properly.
</p>
<p>
LuaZip offers a Makefile and a separate configuration file,
<code>config</code>, which should be edited to suit your installation
before runnig <code>make</code>.
The file has some definitions like paths to the external libraries,
compiler options and the like.
One important definition is the version of Lua language,
which is not obtained from the installed software.
</p>
<p>LuaZip compilation depends on
<a href="http://zziplib.sourceforge.net">zziplib 0.13.49</a> and
<a href="http://www.zlib.net/">zlib 1.2.3</a>.
</p>
<h2><a name="installation"></a>Installation</h2>
<p>The LuaZip compiled binary should be copied to a directory in your
<a href="http://www.lua.org/manual/5.1/manual.html#pdf-package.cpath">C path</a>.
Lua 5.0 users should also install <a href="http://www.keplerproject.org/compat">Compat-5.1</a>.</p>
<h2><a name="reference"></a>Reference</h2>
<dl>
<dt><strong>zip.open (filename)</strong></dt>
<dd>This function opens a zip file and returns a new zip file handle. In case of
error it returns nil and an error message. Unlike <code>io.open</code>, there is no
<code>mode</code> parameter, as the only supported mode is "read".</dd>
<dt><strong>zip.openfile (filename [, extensions]])</strong></dt>
<dd>This function opens a file and returns a file handle. In case of
error it returns nil and an error message. Unlike <code>io.open</code>, there is no
<code>mode</code> parameter, as the only supported mode is "read".<br/>
This function implements a virtual file system based on optionally compressed files.
Instead of simply looking for a file at a given path, this function goes recursively up
through all path separators ("/") looking for zip files there. If it finds a zip file,
this function use the remaining path to open the requested file.<br/>
The optional parameter <em>extensions</em> allows the use of file extensions other than .zip
during the lookup. It can be a string corresponding to the extension or an indexed table
with the lookup extensions sequence.</dd>
<dt><strong>zfile:close ()</strong></dt>
<dd>This function closes a zfile opened by <code>zip.open</code></dd>
<dt><strong>zfile:files ()</strong></dt>
<dd>Returns an iterator function that returns a new table containing the
following information each time it is called:
<ul>
<li><code>filename</code>: the full path of a file</li>
<li><code>compressed_size</code>: the compressed size of the file in bytes</li>
<li><code>uncompressed_size</code>: the uncompressed size of the file in bytes</li>
</ul>
</dd>
<dt><strong>zfile:open (filename)</strong></dt>
<dd>This function opens a file that is stored inside the zip file opened by <code>zip.open</code>.<br/>
The filename may contain the full path of the file contained inside the zip. The
directory separator must be '/'.<br/>
Unlike <code>f:open</code>, there is no <code>mode</code> parameter, as the only
supported mode is "read".</dd>
<dt><strong>file:read (format1, ...)</strong></dt>
<dd>Reads a <code>file</code> according to the given formats, which specify what to read.<br/>
For each format, the function returns a string with the characters read, or nil if it cannot read
data with the specified format. When called without formats, it uses a default format that reads
the entire next line (see below).<br/>
The available formats are:
<ul>
<li><code>"*a"</code>: reads the whole file, starting at the current position. On end of file, it
returns the empty string.</li>
<li><code>"*l"</code>: reads the next line (skipping the end of line), returns nil on end of file.
This is the default format.</li>
<li><code><i>number</i></code>: reads a string with up to that number of characters, returning nil
on end of file.</li>
</ul>
<br/>
Unlike the standard I/O read, the format <code>"*n"</code> is not supported.</dd>
<dt><strong>file:seek ([whence] [, offset])</strong></dt>
<dd>Sets and gets the file position, measured from the beginning of the file, to the position given
by <code>offset</code> plus a base specified by the string <code>whence</code>, as follows:
<ul>
<li><code>set</code>: base is position 0 (beginning of the file);</li>
<li><code>cur</code>: base is current position;</li>
<li><code>end</code>: base is end of file;</li>
</ul>
In case of success, function <code>seek</code> returns the final file position, measured in bytes
from the beginning of the file. If this function fails, it returns nil, plus an error string.
The default value for <code>whence</code> is <code>"cur"</code>, and for <code>offset</code> is 0.
Therefore, the call <code>file:seek()</code> returns the current file position, without changing
it; the call <code>file:seek("set")</code> sets the position to the beginning of the file (and returns 0);
and the call <code>file:seek("end")</code> sets the position to the end of the file, and returns its
size.</dd>
<dt><strong>file:close ()</strong></dt>
<dd>This function closes a file opened by <code>zfile:open</code>.</dd>
<dt><strong>file:lines ()</strong></dt>
<dd>Returns an iterator function that returns a new line from the file each time it is called.
Therefore, the construction<br/>
<pre class="example">for line in file:lines() do ... end</pre>
will iterate over all lines of the file.</dd>
</dl>
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