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<section> <date> created 1.Jun.2000, last updated 09.Feb.2003 </date>
<h2> The Library </h2> Overview
<!--border-->
<!-- 1. section of zzip-zip.html -->
<P>
The <a href="zziplib.html">zziplib library</a> is intentionally
lightweight, it offers the ability to easily extract data from
files archived in a single zip file. Applications can bundle
files into a single zip archive and access them.
The implementation is based only on the (free) subset of
compression with the <a href="http://www.gzip.org/zlib">
zlib algorithm</a> which is actually used by the <tt>zip/unzip</tt> tools.
</P>
<center>
The library allows reading zip archives in a number of ways,
</center><dl>
<dt>archive mode:</dt>
<dd> reading the zip directory and extracting files from it.
This is the traditional mode as seen with unzip-utilities.
Some extra unzip-utiles for transparent/magic mode are
shipped as well.
</dd>
<dt>replacement mode:</dt>
<dd> Use ZZIP_FILE / ZZIP_DIR pointers provided by zziplib and
put them to work with routines originally developped to
work with real directories and file handles. The API calls
do follow traditional synopsis from posix/stdio.
</dd>
<dt>transparent mode:</dt>
<dd> Use replacement handles and allow the open()-calls to
automatically detect when a file is contained in a zip
archive or when it is a real file in the file system.
A filepath can be partly in a real filesystem and partly
within the zip archive when one is seen.
</dd>
<dt> ext magic </dt>
<dd> Use the same filepath to access either a zipped or real
file - it looks for a real file and there is none then
every subdirectory of the path is checked, a ".zip"
extension appended, and the zipped file transparently
opened. This can speed up dat-file development
dramatically.
</dd>
<dt> io/xor magic </dt>
<dd> The access to the filesystem can be hooked up - examples
are given for xor obfuscation which is great for game
artwork and AI data. A small intro for SDLrwops usage is
given as well.
</dd>
</dl>
</section>
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