<?php

/**
 * @author     bouchon
 * @link       http://dev.maxg.info
 * @link       http://forum.maxg.info
 *
 *  Modified for Dokuwiki
 *  @author    Christopher Smith <chris@jalakai.co.uk>
 */
class ZipLib
{

 var $datasec, $ctrl_dir = array();
 var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
 var $old_offset = 0; var $dirs = Array(".");

 function get_List($zip_name)
 {
   $zip = @fopen($zip_name, 'rb');
   if(!$zip) return(0);
   $centd = $this->ReadCentralDir($zip,$zip_name);

    @rewind($zip);
    @fseek($zip, $centd['offset']);

   for ($i=0; $i<$centd['entries']; $i++)
   {
    $header = $this->ReadCentralFileHeaders($zip);
    $header['index'] = $i;$info['filename'] = $header['filename'];
    $info['stored_filename'] = $header['stored_filename'];
    $info['size'] = $header['size'];$info['compressed_size']=$header['compressed_size'];
    $info['crc'] = strtoupper(dechex( $header['crc'] ));
    $info['mtime'] = $header['mtime']; $info['comment'] = $header['comment'];
    $info['folder'] = ($header['external']==0x41FF0010||$header['external']==16)?1:0;
    $info['index'] = $header['index'];$info['status'] = $header['status'];
    $ret[]=$info; unset($header);
   }
  return $ret;
 }

 function Add($files,$compact)
 {
  if(!is_array($files[0])) $files=Array($files);

  for($i=0;$files[$i];$i++){
    $fn = $files[$i];
    if(!in_Array(dirname($fn[0]),$this->dirs))
     $this->add_Dir(dirname($fn[0]));
    if(basename($fn[0]))
     $ret[basename($fn[0])]=$this->add_File($fn[1],$fn[0],$compact);
  }
  return $ret;
 }

 /**
  * Zips recursively the $folder directory, from the $basedir directory
  */
 function Compress($folder, $basedir=null, $parent=null)
 {
  $full_path = $basedir."/".$parent.$folder;
  $zip_path = $parent.$folder;
  if ($zip_path) {
   $zip_path .= "/";
   $this->add_dir($zip_path);
  }
  $dir = opendir($full_path);
  while (false !== ($filename = readdir($dir))) {
   if ($filename != "." && $filename != "..") {
    if (is_dir($full_path."/".$filename)) {
     $this->Compress($filename, $basedir, $zip_path);
    } else {
     $content = join('', file($full_path.'/'.$filename));
     $this->add_File($content, $zip_path.$filename);
    }
   }
  }
 }

 /**
  * Returns the Zip file
  */
 function get_file()
 {
   $data = implode('', $this -> datasec);
   $ctrldir = implode('', $this -> ctrl_dir);

   return $data . $ctrldir . $this -> eof_ctrl_dir .
    pack('v', sizeof($this -> ctrl_dir)).pack('v', sizeof($this -> ctrl_dir)).
    pack('V', strlen($ctrldir)) . pack('V', strlen($data)) . "\x00\x00";
 }

 function add_dir($name) 
 { 
   $name = str_replace("\\", "/", $name); 
   $fr = "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00"; 

   $fr .= pack("V",0).pack("V",0).pack("V",0).pack("v", strlen($name) ); 
   $fr .= pack("v", 0 ).$name.pack("V", 0).pack("V", 0).pack("V", 0); 
   $this -> datasec[] = $fr;

   $new_offset = strlen(implode("", $this->datasec)); 

   $cdrec = "\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00"; 
   $cdrec .= pack("V",0).pack("V",0).pack("V",0).pack("v", strlen($name) ); 
   $cdrec .= pack("v", 0 ).pack("v", 0 ).pack("v", 0 ).pack("v", 0 ); 
   $ext = "\xff\xff\xff\xff"; 
   $cdrec .= pack("V", 16 ).pack("V", $this -> old_offset ).$name; 

   $this -> ctrl_dir[] = $cdrec; 
   $this -> old_offset = $new_offset; 
   $this -> dirs[] = $name;
 }

 /**
  * Add a file named $name from a string $data
  */
 function add_File($data, $name, $compact = 1)
 {
   $name     = str_replace('\\', '/', $name);
   $dtime    = dechex($this->DosTime());

   $hexdtime = '\x' . $dtime[6] . $dtime[7].'\x'.$dtime[4] . $dtime[5]
     . '\x' . $dtime[2] . $dtime[3].'\x'.$dtime[0].$dtime[1];
   eval('$hexdtime = "' . $hexdtime . '";');

   if($compact)
   $fr = "\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00".$hexdtime;
   else $fr = "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00".$hexdtime;
   $unc_len = strlen($data); $crc = crc32($data);

   if($compact){
     $zdata = gzcompress($data); $c_len = strlen($zdata);
     $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2);
   }else{
     $zdata = $data;
   }
   $c_len=strlen($zdata);
   $fr .= pack('V', $crc).pack('V', $c_len).pack('V', $unc_len);
   $fr .= pack('v', strlen($name)).pack('v', 0).$name.$zdata;

   $fr .= pack('V', $crc).pack('V', $c_len).pack('V', $unc_len);

   $this -> datasec[] = $fr;
   $new_offset        = strlen(implode('', $this->datasec));
   if($compact)
        $cdrec = "\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00";
   else $cdrec = "\x50\x4b\x01\x02\x14\x00\x0a\x00\x00\x00\x00\x00";
   $cdrec .= $hexdtime.pack('V', $crc).pack('V', $c_len).pack('V', $unc_len);
   $cdrec .= pack('v', strlen($name) ).pack('v', 0 ).pack('v', 0 );
   $cdrec .= pack('v', 0 ).pack('v', 0 ).pack('V', 32 );
   $cdrec .= pack('V', $this -> old_offset );

   $this -> old_offset = $new_offset;
   $cdrec .= $name;
   $this -> ctrl_dir[] = $cdrec;
   return true;
 }

 function DosTime() {
   $timearray = getdate();
   if ($timearray['year'] < 1980) {
     $timearray['year'] = 1980; $timearray['mon'] = 1;
     $timearray['mday'] = 1; $timearray['hours'] = 0;
     $timearray['minutes'] = 0; $timearray['seconds'] = 0;
   }
   return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) |     ($timearray['mday'] << 16) | ($timearray['hours'] << 11) | 
    ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
 }

 /**
  * Extract a zip file $zn to the $to directory
  */
 function Extract ( $zn, $to, $index = Array(-1) )
 {
   if(!@is_dir($to)) @mkdir($to,0777);
   $ok = 0; $zip = @fopen($zn,'rb');
   if(!$zip) return(-1);
   $cdir = $this->ReadCentralDir($zip,$zn);
   $pos_entry = $cdir['offset'];

   if(!is_array($index)){ $index = array($index);  }
   for($i=0; isset($index[$i]);$i++){
     if(intval($index[$i])!=$index[$i]||$index[$i]>$cdir['entries'])
      return(-1);
   }

   for ($i=0; $i<$cdir['entries']; $i++)
   {
     @fseek($zip, $pos_entry);
     $header = $this->ReadCentralFileHeaders($zip);
     $header['index'] = $i; $pos_entry = ftell($zip);
     @rewind($zip); fseek($zip, $header['offset']);
     if(in_array("-1",$index)||in_array($i,$index))
      $stat[$header['filename']]=$this->ExtractFile($header, $to, $zip);
      
   }
   fclose($zip);
   return $stat;
 }

  function ReadFileHeader($zip, $header)
  {
    $binary_data = fread($zip, 30);
    $data = unpack('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $binary_data);

    $header['filename'] = fread($zip, $data['filename_len']);
    if ($data['extra_len'] != 0) {
      $header['extra'] = fread($zip, $data['extra_len']);
    } else { $header['extra'] = ''; }

    $header['compression'] = $data['compression'];
    $header['flag'] = $data['flag'];
    $header['mdate'] = $data['mdate'];$header['mtime'] = $data['mtime'];
    if (($header['flag'] & 8) != 8) { // Purpose bit flag bit 3 not set, overwrite the central header values
     foreach (array('size','compressed_size','crc') as $hd) {
      $header[$hd] = $data[$hd];
     }
    }

    if ($header['mdate'] && $header['mtime']){
     $hour=($header['mtime']&0xF800)>>11;$minute=($header['mtime']&0x07E0)>>5;
     $seconde=($header['mtime']&0x001F)*2;$year=(($header['mdate']&0xFE00)>>9)+1980;
     $month=($header['mdate']&0x01E0)>>5;$day=$header['mdate']&0x001F;
     $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
    }else{$header['mtime'] = time();}

    $header['stored_filename'] = $header['filename'];
    $header['status'] = "ok";
    return $header;
  }

 function ReadCentralFileHeaders($zip){
    $binary_data = fread($zip, 46);
    $header = unpack('vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $binary_data);

    if ($header['filename_len'] != 0)
      $header['filename'] = fread($zip,$header['filename_len']);
    else $header['filename'] = '';

    if ($header['extra_len'] != 0)
      $header['extra'] = fread($zip, $header['extra_len']);
    else $header['extra'] = '';

    if ($header['comment_len'] != 0)
      $header['comment'] = fread($zip, $header['comment_len']);
    else $header['comment'] = '';

    if ($header['mdate'] && $header['mtime'])
    {
      $hour = ($header['mtime'] & 0xF800) >> 11;
      $minute = ($header['mtime'] & 0x07E0) >> 5;
      $seconde = ($header['mtime'] & 0x001F)*2;
      $year = (($header['mdate'] & 0xFE00) >> 9) + 1980;
      $month = ($header['mdate'] & 0x01E0) >> 5;
      $day = $header['mdate'] & 0x001F;
      $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
    } else {
      $header['mtime'] = time();
    }
    $header['stored_filename'] = $header['filename'];
    $header['status'] = 'ok';
    if (substr($header['filename'], -1) == '/')
      $header['external'] = 0x41FF0010;
    return $header;
 }

 function ReadCentralDir($zip,$zip_name)
 {
  $size = filesize($zip_name);
  if ($size < 277) $maximum_size = $size;
  else $maximum_size=277;

  @fseek($zip, $size-$maximum_size);
  $pos = ftell($zip); $bytes = 0x00000000;

  while ($pos < $size)
  {
    $byte = @fread($zip, 1);
    $bytes=(($bytes << 8) & 0xFFFFFFFF) | Ord($byte);
    if ($bytes == 0x504b0506){ $pos++; break; } $pos++;
  }

 $data=unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size',
        fread($zip, 18));

  if ($data['comment_size'] != 0)
    $centd['comment'] = fread($zip, $data['comment_size']);
    else $centd['comment'] = ''; $centd['entries'] = $data['entries'];
  $centd['disk_entries'] = $data['disk_entries'];
  $centd['offset'] = $data['offset'];$centd['disk_start'] = $data['disk_start'];
  $centd['size'] = $data['size'];  $centd['disk'] = $data['disk'];
  return $centd;
 }

 function ExtractFile($header,$to,$zip)
 {
   $header = $this->readfileheader($zip, $header);

   if(substr($to,-1)!="/") $to.="/";
   if(substr($header['filename'],-1)=="/")
   {
//    @mkdir($to.$header['filename']);   --CS
    $this->_mkdir($to.$header['filename']);  //-- CS
    return +2;
   }

//   $pth = explode("/",dirname($header['filename']));
//   for($i=0,$tmp="";isset($pth[$i]);$i++){
//     if(!$pth[$i]) continue;
//     if(!is_dir($to.$tmp.$pth[$i])) @mkdir($to.$pth[$i],0777);
//     $tmp.=$pth[$i]."/";
//   }
  if (!$this->_mkdir($to.dirname($header['filename']))) return (-1);   //--CS

  if (!array_key_exists("external", $header) || (!($header['external']==0x41FF0010)&&!($header['external']==16)))
  {
   if ($header['compression']==0)
   {
    $fp = @fopen($to.$header['filename'], 'wb');
    if(!$fp) return(-1);
    $size = $header['compressed_size'];

    while ($size != 0)
    {
      $read_size = ($size < 2048 ? $size : 2048);
      $buffer = fread($zip, $read_size);
      $binary_data = pack('a'.$read_size, $buffer);
      @fwrite($fp, $binary_data, $read_size);
      $size -= $read_size;
    }
    fclose($fp);
    touch($to.$header['filename'], $header['mtime']);

  }else{
   if (!is_dir(dirname($to.$header['filename']))) $this->_mkdir(dirname($to.$header['filename']));  //-CS
   $fp = fopen($to.$header['filename'].'.gz','wb');
   if(!$fp) return(-1);
   $binary_data = pack('va1a1Va1a1', 0x8b1f, Chr($header['compression']),
     Chr(0x00), time(), Chr(0x00), Chr(3));

   fwrite($fp, $binary_data, 10);
   $size = $header['compressed_size'];

   while ($size != 0)
   {
     $read_size = ($size < 1024 ? $size : 1024);
     $buffer = fread($zip, $read_size);
     $binary_data = pack('a'.$read_size, $buffer);
     @fwrite($fp, $binary_data, $read_size);
     $size -= $read_size;
   }

   $binary_data = pack('VV', $header['crc'], $header['size']);
   fwrite($fp, $binary_data,8); fclose($fp);

   $gzp = @gzopen($to.$header['filename'].'.gz','rb');
    if(!$gzp){
       @gzclose($gzp); @unlink($to.$header['filename']);
       die("Archive is compressed whereas ZLIB is not enabled.");
    }
   $fp = @fopen($to.$header['filename'],'wb');
   if(!$fp) return(-1);
   $size = $header['size'];

   while ($size != 0)
   {
     $read_size = ($size < 2048 ? $size : 2048);
     $buffer = gzread($gzp, $read_size);
     $binary_data = pack('a'.$read_size, $buffer);
     @fwrite($fp, $binary_data, $read_size);
     $size -= $read_size;
   }
   fclose($fp); gzclose($gzp);

   touch($to.$header['filename'], $header['mtime']);
   @unlink($to.$header['filename'].'.gz');

  }}
  return true;
 }
 
 //--CS start
 // centralize mkdir calls and use dokuwiki io functions  
 function _mkdir($d) {
    return io_mkdir_p($d); // --AB
    //return ap_mkdir($d);  
 }
 //--CS end
}