<?php if (!defined('PmWiki')) exit();
/*  Copyright 2005-2009 Patrick R. Michaud (pmichaud@pobox.com)
    File created by Petko Yotov (2009)

    This file written for PmWiki; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published
    by the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.  See pmwiki.php for full details.


*/

$HandleActions['zipexport'] = 'HandleZipExport';
$HandleAuth['zipexport'] = 'read';

// $HandleAuth['zipexport'] = 'zipexport';
// $DefaultPasswords['zipexport'] = array('quick');

# privacy & version stuff
$SkipPageAttributes = array('version', 'newline', 'host', 'agent');

global $WorkDir;
SDV($ZipTempDir, $WorkDir);
$ZipTargetDir = '';
SDVA($FeedPageListOpt, array('list' => 'normal'));

function HandleZipExport($pagename, $auth = 'read') {
  global $action, $PCache, $FeedPageListOpt, $FeedCategoryOpt, $FeedTrailOpt, $Charset,
    $CategoryGroup, $Version, $ZipTempDir, $ZipTargetDir, $SkipPageAttributes, $Now;

  $page = RetrieveAuthPage($pagename, $auth, true, READPAGE_CURRENT);
  if (!$page) Abort("?cannot generate archive");
  
  $FeedPageListOpt = (array)@$FeedPageListOpt;
  SDVA($FeedCategoryOpt, array('link' => $pagename));
  SDVA($FeedTrailOpt, array('trail' => $pagename));

  $feedtime = $page['time'];

  # determine list of pages to display
  if (@($_REQUEST['trail'] || $_REQUEST['group'] || $_REQUEST['link'] 
        || $_REQUEST['name'])) 
    $opt = $FeedPageListOpt;
  else if (preg_match("/^$CategoryGroup\\./", $pagename))
    $opt = $FeedCategoryOpt;
  else { 
    PCache($pagename, $page); 
    $pagelist = array($pagename); 
  }
  if (!@$pagelist) {
    $opt = array_merge($opt, @$_REQUEST);
    $pagelist = MakePageList($pagename, $opt, 0);
  }


  $r0 = array('%', "\n", '<');
  $r1 = array('%25', '%0a', '%3c');
  $zip = new zipfile();
  foreach($pagelist as $pn) {
    $page = RetrieveAuthPage($pn, 'read', false, READPAGE_CURRENT);
    if(!$page) continue;

    foreach($SkipPageAttributes as $v) unset($page[$v]);
    if(@$page['charset']=='') $page['charset']='ISO-8859-1'; # just in case
    uksort($page, 'CmpPageAttr');
    $x = "version=$Version ordered=1 urlencoded=1\n";

    foreach($page as $k=>$v)
      if ($k > '' && $v>'' && $k{0} != '=') {
        $x .= str_replace($r0, $r1, "$k=$v") . "\n";
      }
    if($page['charset']=='UTF-8') $u = null;
    elseif($page['charset']=='ISO-8859-1'){
      $u  = utf8_encode( preg_replace('/^charset=.*$/m', 'charset=UTF-8', $x) );
      $un = utf8_encode( $pn );
    }
    elseif(function_exists('iconv')){
      $u  = iconv($page['charset'], 'UTF-8//IGNORE',
        preg_replace('/^charset=.*$/m', 'charset=UTF-8', $x));
      $un = iconv($page['charset'], 'UTF-8//IGNORE', $pn );
    }
    else $u = null;  # sorry, no iconv()

    $zip->addFile($x, "{$page['charset']}/wikilib.d/$pn");
    if($u)
      $zip->addFile($u, "UTF-8/wikilib.d/$un");
  }
  $archive = $zip->file();

  $downname = preg_replace('/\\..*$/', '', $pagename) .'.zip';

  header("Content-Type: application/zip");
  header("Content-Length: ".strlen($archive));
  header("Content-disposition: inline; filename=$downname");
  echo $archive;
  exit;
}


/**
 * 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)
        $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;
        $new_offset        = strlen(implode('', $this->datasec));

        // 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 = $new_offset;

        $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