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/**
* Creates Zipfiles
*
* @copyright http://www.impresscms.org/ The ImpressCMS Project
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU General Public License (GPL)
*
* @category ICMS
* @package Core
* @version SVN: $Id: ZipFileHandler.php 12310 2013-09-13 21:33:58Z skenow $
*/
/**
* Zip file creation class.
* Makes zip files.
* package::i.tools
*
* php-downloader v1.0 - www.ipunkt.biz
*
* 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
*
* @copyright (c) 2002 - www.ipunkt.biz (rok)
*
* @access public
* @category ICMS
* @package Core
*/
class icms_file_ZipFileHandler {
/**
* Array to store compressed data
*
* @var array $datasec
*/
private $datasec = array();
/**
* Central directory
*
* @var array $ctrl_dir
*/
private $ctrl_dir = array();
/**
* End of central directory record
*
* @var string $eof_ctrl_dir
*/
private $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
/**
* Last offset position
*
* @var integer $old_offset
*/
private $old_offset = 0;
/**
* Converts an Unix timestamp to a four byte DOS date and time format (date
* in high two bytes, time in low two bytes allowing magnitude comparison).
*
* @param integer the current Unix timestamp
*
* @return integer the current date in a four byte DOS format
*
* @access private
*/
private function unix2DosTime($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) | ($timearray['seconds'] >> 1);
} // end of the 'unix2DosTime()' method
/**
* Adds "file" to archive
*
* @param string file contents
* @param string name of the file in the archive (may contains the path)
* @param integer the current timestamp
*
* @access public
*/
public function addFile($data, $name, $time = 0) {
$name = str_replace('\\', '/', $name);
$dtime = dechex(self::unix2DosTime($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
*/
public function file() {
$data = implode('', $this -> datasec);
$ctrldir = implode('', $this -> ctrl_dir);
return
$data
. $ctrldir
. $this -> eof_ctrl_dir
. pack('v', count($this -> ctrl_dir)) // total # of entries "on this disk"
. pack('v', count($this -> ctrl_dir)) // total # of entries overall
. pack('V', strlen($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