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diff --git a/extras/zipfile.class.php b/extras/zipfile.class.php
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+<?php
+/* vim: set expandtab sw=4 ts=4 sts=4: */
+/**
+ *
+ * @version $Id$
+ */
+
+/**
+ * Zip file creation class.
+ * Makes zip files.
+ *
+ * Based on :
+ *
+ *  http://www.zend.com/codex.php?id=535&single=1
+ *  By Eric Mueller <eric@themepark.com>
+ *
+ *  http://www.zend.com/codex.php?id=470&single=1
+ *  by Denis125 <webmaster@atlant.ru>
+ *
+ *  a patch from Peter Listiak <mlady@users.sourceforge.net> for last modified
+ *  date and time of the compressed file
+ *
+ * Official ZIP file format: http://www.pkware.com/appnote.txt
+ *
+ * @access  public
+ */
+class zipfile
+{
+    /**
+     * Array to store compressed data
+     *
+     * @var  array    $datasec
+     */
+    var $datasec      = array();
+
+    /**
+     * Central directory
+     *
+     * @var  array    $ctrl_dir
+     */
+    var $ctrl_dir     = array();
+
+    /**
+     * End of central directory record
+     *
+     * @var  string   $eof_ctrl_dir
+     */
+    var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
+
+    /**
+     * Last offset position
+     *
+     * @var  integer  $old_offset
+     */
+    var $old_offset   = 0;
+
+
+    /**
+     * Converts an Unix timestamp to a four byte DOS date and time format (date
+     * in high two bytes, time in low two bytes allowing magnitude comparison).
+     *
+     * @param  integer  the current Unix timestamp
+     *
+     * @return integer  the current date in a four byte DOS format
+     *
+     * @access private
+     */
+    function unix2DosTime($unixtime = 0) {
+        $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
+
+        if ($timearray['year'] < 1980) {
+            $timearray['year']    = 1980;
+            $timearray['mon']     = 1;
+            $timearray['mday']    = 1;
+            $timearray['hours']   = 0;
+            $timearray['minutes'] = 0;
+            $timearray['seconds'] = 0;
+        } // end if
+
+        return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
+                ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
+    } // end of the 'unix2DosTime()' method
+
+
+    /**
+     * Adds "file" to archive
+     *
+     * @param  string   file contents
+     * @param  string   name of the file in the archive (may contains the path)
+     * @param  integer  the current timestamp
+     *
+     * @access public
+     */
+    function addFile($data, $name, $time = 0)
+    {
+        $name     = str_replace('\\', '/', $name);
+
+        $dtime    = dechex($this->unix2DosTime($time));
+        $hexdtime = '\x' . $dtime[6] . $dtime[7]
+                  . '\x' . $dtime[4] . $dtime[5]
+                  . '\x' . $dtime[2] . $dtime[3]
+                  . '\x' . $dtime[0] . $dtime[1];
+        eval('$hexdtime = "' . $hexdtime . '";');
+
+        $fr   = "\x50\x4b\x03\x04";
+        $fr   .= "\x14\x00";            // ver needed to extract
+        $fr   .= "\x00\x00";            // gen purpose bit flag
+        $fr   .= "\x08\x00";            // compression method
+        $fr   .= $hexdtime;             // last mod time and date
+
+        // "local file header" segment
+        $unc_len = strlen($data);
+        $crc     = crc32($data);
+        $zdata   = gzcompress($data);
+        $zdata   = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
+        $c_len   = strlen($zdata);
+        $fr      .= pack('V', $crc);             // crc32
+        $fr      .= pack('V', $c_len);           // compressed filesize
+        $fr      .= pack('V', $unc_len);         // uncompressed filesize
+        $fr      .= pack('v', strlen($name));    // length of filename
+        $fr      .= pack('v', 0);                // extra field length
+        $fr      .= $name;
+
+        // "file data" segment
+        $fr .= $zdata;
+
+        // "data descriptor" segment (optional but necessary if archive is not
+        // served as file)
+        // nijel(2004-10-19): this seems not to be needed at all and causes
+        // problems in some cases (bug #1037737)
+        //$fr .= pack('V', $crc);                 // crc32
+        //$fr .= pack('V', $c_len);               // compressed filesize
+        //$fr .= pack('V', $unc_len);             // uncompressed filesize
+
+        // add this entry to array
+        $this -> datasec[] = $fr;
+
+        // now add to central directory record
+        $cdrec = "\x50\x4b\x01\x02";
+        $cdrec .= "\x00\x00";                // version made by
+        $cdrec .= "\x14\x00";                // version needed to extract
+        $cdrec .= "\x00\x00";                // gen purpose bit flag
+        $cdrec .= "\x08\x00";                // compression method
+        $cdrec .= $hexdtime;                 // last mod time & date
+        $cdrec .= pack('V', $crc);           // crc32
+        $cdrec .= pack('V', $c_len);         // compressed filesize
+        $cdrec .= pack('V', $unc_len);       // uncompressed filesize
+        $cdrec .= pack('v', strlen($name)); // length of filename
+        $cdrec .= pack('v', 0);             // extra field length
+        $cdrec .= pack('v', 0);             // file comment length
+        $cdrec .= pack('v', 0);             // disk number start
+        $cdrec .= pack('v', 0);             // internal file attributes
+        $cdrec .= pack('V', 32);            // external file attributes - 'archive' bit set
+
+        $cdrec .= pack('V', $this -> old_offset); // relative offset of local header
+        $this -> old_offset += strlen($fr);
+
+        $cdrec .= $name;
+
+        // optional extra field, file comment goes here
+        // save to central directory
+        $this -> ctrl_dir[] = $cdrec;
+    } // end of the 'addFile()' method
+
+
+    /**
+     * Dumps out file
+     *
+     * @return  string  the zipped file
+     *
+     * @access public
+     */
+    function file()
+    {
+        $data    = implode('', $this -> datasec);
+        $ctrldir = implode('', $this -> ctrl_dir);
+
+        return
+            $data .
+            $ctrldir .
+            $this -> eof_ctrl_dir .
+            pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
+            pack('v', sizeof($this -> ctrl_dir)) .  // total # of entries overall
+            pack('V', strlen($ctrldir)) .           // size of central dir
+            pack('V', strlen($data)) .              // offset to start of central dir
+            "\x00\x00";                             // .zip file comment length
+    } // end of the 'file()' method
+
+} // end of the 'zipfile' class
+?>