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<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
* Code Igniter
*
* An open source application development framework for PHP 4.3.2 or newer
*
* @package CodeIgniter
* @author Rick Ellis
* @copyright Copyright (c) 2006, pMachine, Inc.
* @license http://www.codeignitor.com/user_guide/license.html
* @link http://www.codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* Zip Compression Class
*
* This class is based on a library aquired at Zend:
* http://www.zend.com/codex.php?id=696&single=1
*
*
* @package CodeIgniter
* @subpackage Libraries
* @category Encryption
* @author Rick Ellis
* @link http://www.codeigniter.com/user_guide/general/encryption.html
*/
class Zip {
var $zipdata = array();
var $directory = array();
var $offset = 0;
var $zipfile = '';
/**
* Add Directory
*
* Lets you add a virtual directory into which you can place files.
*
* @access public
* @param string the directory name
* @return void
*/
function add_dir($dir)
{
$this->zipfile = '';
$dir = str_replace("\\", "/", $dir);
$this->zipdata[] = "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00"
.pack('V', 0)
.pack('V', 0)
.pack('V', 0)
.pack('v', strlen($dir))
.pack('v', 0)
.$dir
.pack('V', 0)
.pack('V', 0)
.pack('V', 0);
$newoffset = strlen(implode('', $this->zipdata));
$record = "\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00"
.pack('V',0)
.pack('V',0)
.pack('V',0)
.pack('v', strlen($dir))
.pack('v', 0)
.pack('v', 0)
.pack('v', 0)
.pack('v', 0)
.pack('V', 16)
.pack('V', $this->offset)
.$dir;
$this->offset = $newoffset;
$this->directory[] = $record;
}
// --------------------------------------------------------------------
/**
* Add File
*
* Lets you add files to the archive. If the path is included
* in the filename it will be placed within a directory. Make
* sure you use add_dir() first to create the folder.
*
* @access public
* @param string the file name
* @param string the data to be encoded
* @return void
*/
function add_file($filename, $data)
{
$this->zipfile = '';
$filename = str_replace("\\", "/", $filename);
$oldlen = strlen($data);
$crc32 = crc32($data);
$gzdata = gzcompress($data);
$gzdata = substr(substr($gzdata, 0, strlen($gzdata) - 4), 2);
$newlen = strlen($gzdata);
$this->zipdata[] = "\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00\x00\x00\x00\x00"
.pack('V', $crc32)
.pack('V', $newlen)
.pack('V', $oldlen)
.pack('v', strlen($filename))
.pack('v', 0)
.$filename
.$gzdata
.pack('V', $crc32)
.pack('V', $newlen)
.pack('V', $oldlen);
$newoffset = strlen(implode("", $this->zipdata));
$record = "\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00\x00\x00\x00\x00"
.pack('V', $crc32)
.pack('V', $newlen)
.pack('V', $oldlen)
.pack('v', strlen($filename))
.pack('v', 0)
.pack('v', 0)
.pack('v', 0)
.pack('v', 0)
.pack('V', 32)
.pack('V', $this->offset);
$this->offset = $newoffset;
$this->directory[] = $record.$filename;
}
// --------------------------------------------------------------------
/**
* Read the content of a file
*
* @access public
* @param string the file path
* @return string
*/
function read_file($filepath)
{
if ( ! file_exists($filepath))
{
return FALSE;
}
return file_get_contents($filepath);
}
// --------------------------------------------------------------------
/**
* Get the Zip file
*
* @access public
* @return binary string
*/
function get_zip()
{
if ($this->zipfile != '')
{
return $this->zipfile;
}
$data = implode('', $this->zipdata);
$dir = implode('', $this->directory);
$this->zipfile = $data.$dir."\x50\x4b\x05\x06\x00\x00\x00\x00"
.pack('v', sizeof($this->directory))
.pack('v', sizeof($this->directory))
.pack('V', strlen($dir))
.pack('V', strlen($data))
."\x00\x00";
return $this->zipfile;
}
// --------------------------------------------------------------------
/**
* Write File
*
* Lets you write a file
*
* @access public
* @param string the file name
* @param string the data to be encoded
* @return bool
*/
function write_file($filename, $data)
{
if ( ! ($fp = fopen($filename, "wb")))
{
return FALSE;
}
flock($fp, LOCK_EX);
fwrite($fp, $data);
flock($fp, LOCK_UN);
fclose($fp);
return TRUE;
}
// --------------------------------------------------------------------
/**
* Download
*
*
* @access public
* @param string the file name
* @param string the data to be encoded
* @return bool
*/
function download($filename, $data)
{
if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE"))
{
header('Content-Type: application/x-zip');
header('Content-Disposition: inline; filename="'.$filename.'"');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header("Content-Transfer-Encoding: binary");
header('Pragma: public');
header("Content-Length: ".strlen($data));
}
else
{
header('Content-Type: application/x-zip');
header('Content-Disposition: attachment; filename="'.$filename.'"');
header("Content-Transfer-Encoding: binary");
header('Expires: 0');
header('Pragma: no-cache');
header("Content-Length: ".strlen($data));
}
echo $data;
}
}
?>
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