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<?php
/* $Id: zip.lib.php,v 1.7ext 2004/07/11 02:17:26 chaosmaker Exp $ */
/**
* 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
*
* Changed by Daniel Rathjen <webmaster@chaosonline.de>
* for ability of storing large amounts of files
* using temporary files
* http://www.chaosonline.de/
*
* @access public
*/
class zipfile
{
/**
* File to store compressed data
*
* @var $datasec_file
*/
var $datasec_file;
/**
* Number of stored files
*
* @var integer $datasec_count
*/
var $datasec_count = 0;
/**
* Central directory
*
* @var $ctrl_dir_file
*/
var $ctrl_dir_file;
/**
* Size of central directory (same as number of stored files)
*
* @var integer $ctrl_dir_count
*/
var $ctrl_dir_count = 0;
/**
* 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;
/**
* Creates temporary files to store data
* Added for usage of this class with large amount of files
*
* @access private
*/
function zipfile() {
$this->datasec_file = tempnam('','logd_datasec_');
$this->ctrl_dir_file = tempnam('','logd_ctrldir_');
}
/**
* Converts an Unix timestamp to a four byte DOS date and time format (date
* in high two bytes, time in low two bytes allowing magnitude comparison).
*
* @param integer the current Unix timestamp
*
* @return integer the current date in a four byte DOS format
*
* @access private
*/
function unix2DosTime($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 datasec
$datasec_handle = fopen($this->datasec_file,'a');
fwrite($datasec_handle,$fr);
fclose($datasec_handle);
$this->datasec_count++;
$new_offset = $this->old_offset + strlen($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 = $new_offset;
$cdrec .= $name;
// optional extra field, file comment goes here
// save to central directory
$ctrl_dir_handle = fopen($this->ctrl_dir_file,'a');
fwrite($ctrl_dir_handle,$cdrec);
fclose($ctrl_dir_handle);
$this->ctrl_dir_count++;
} // end of the 'addFile()' method
/**
* Dumps out file
*
* @access public
*/
function file() {
$ctrl_dir_size = filesize($this->ctrl_dir_file);
$datasec_size = filesize($this->datasec_file);
$str = $this -> eof_ctrl_dir .
pack('v', $this->ctrl_dir_count) . // total # of entries "on this disk"
pack('v', $this->ctrl_dir_count) . // total # of entries overall
pack('V', $ctrl_dir_size) . // size of central dir
pack('V', $datasec_size) . // offset to start of central dir
"\x00\x00"; // .zip file comment length
header("Content-length: ".(strlen($str)+$ctrl_dir_size+$datasec_size));
header("Content-Disposition: attachment; filename=\"logd.zip\"");
header("Content-type: application/zip");
$fp = fopen($this->datasec_file,'a');
fwrite($fp,file_get_contents($this->ctrl_dir_file));
fwrite($fp,$str);
fclose($fp);
readfile($this->datasec_file);
//readfile($this->ctrl_dir_file);
//echo $str;
unlink($this->datasec_file);
unlink($this->ctrl_dir_file);
} // end of the 'file()' method
} // end of the 'zipfile' class
?>