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<?php
/**
* @version $Id:gzip.php 6961 2007-03-15 16:06:53Z tcp $
* @package Joomla.Framework
* @subpackage FileSystem
* @copyright Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
* @license GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/
// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();
/**
* Gzip format adapter for the JArchive class
*
* This class is inspired from and draws heavily in code and concept from the Compress package of
* The Horde Project <http://www.horde.org>
*
* @contributor Michael Slusarz <slusarz@horde.org>
* @contributor Michael Cochrane <mike@graftonhall.co.nz>
*
* @package Joomla.Framework
* @subpackage FileSystem
* @since 1.5
*/
class JArchiveGzip extends JObject
{
/**
* Gzip file flags.
* @var array
*/
var $_flags = array (
'FTEXT' => 0x01,
'FHCRC' => 0x02,
'FEXTRA' => 0x04,
'FNAME' => 0x08,
'FCOMMENT' => 0x10
);
/**
* Gzip file data buffer
* @var string
*/
var $_data = null;
/**
* Extract a Gzip compressed file to a given path
*
* @access public
* @param string $archive Path to ZIP archive to extract
* @param string $destination Path to extract archive to
* @param array $options Extraction options [unused]
* @return boolean True if successful
* @since 1.5
*/
function extract($archive, $destination, $options = array ())
{
// Initialize variables
$this->_data = null;
if (!extension_loaded('zlib')) {
$this->set('error.message', 'Zlib Not Supported');
return JError::raiseWarning(100, $this->get('error.message'));
}
if (!$this->_data = JFile::read($archive)) {
$this->set('error.message', 'Unable to read archive');
return JError::raiseWarning(100, $this->get('error.message'));
}
$position = $this->_getFilePosition();
$buffer = gzinflate(substr($this->_data, $position, strlen($this->_data) - $position));
if (empty ($buffer)) {
$this->set('error.message', 'Unable to decompress data');
return JError::raiseWarning(100, $this->get('error.message'));
}
if (JFile::write($destination, $buffer) === false) {
$this->set('error.message', 'Unable to write archive');
return JError::raiseWarning(100, $this->get('error.message'));
}
return true;
}
/**
* Get file data offset for archive
*
* @access public
* @return int Data position marker for archive
* @since 1.5
*/
function _getFilePosition()
{
// gzipped file... unpack it first
$position = 0;
$info = @ unpack('CCM/CFLG/VTime/CXFL/COS', substr($this->_data, $position +2));
if (!$info) {
$this->set('error.message', 'Unable to decompress data');
return false;
}
$position += 10;
if ($info['FLG'] & $this->_flags['FEXTRA']) {
$XLEN = unpack('vLength', substr($this->_data, $position +0, 2));
$XLEN = $XLEN['Length'];
$position += $XLEN +2;
}
if ($info['FLG'] & $this->_flags['FNAME']) {
$filenamePos = strpos($this->_data, "\x0", $position);
$filename = substr($this->_data, $position, $filenamePos - $position);
$position = $filenamePos +1;
}
if ($info['FLG'] & $this->_flags['FCOMMENT']) {
$commentPos = strpos($this->_data, "\x0", $position);
$comment = substr($this->_data, $position, $commentPos - $position);
$position = $commentPos +1;
}
if ($info['FLG'] & $this->_flags['FHCRC']) {
$hcrc = unpack('vCRC', substr($this->_data, $position +0, 2));
$hcrc = $hcrc['CRC'];
$position += 2;
}
return $position;
}
}