david
802479ed64
git-svn-id: https://192.168.0.254/svn/Proyectos.FundacionLQDVI_WebCongresos/trunk@2 94ccb1af-fd9d-d947-8d90-7f70ea60afc8
135 lines
3.7 KiB
PHP
135 lines
3.7 KiB
PHP
<?php
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/**
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* @version $Id:gzip.php 6961 2007-03-15 16:06:53Z tcp $
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* @package Joomla.Framework
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* @subpackage FileSystem
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* @copyright Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
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* @license GNU/GPL, see LICENSE.php
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* Joomla! is free software. This version may have been modified pursuant
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* to the GNU General Public License, and as distributed it includes or
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* is derivative of works licensed under the GNU General Public License or
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* other free or open source software licenses.
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* See COPYRIGHT.php for copyright notices and details.
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*/
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// Check to ensure this file is within the rest of the framework
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defined('JPATH_BASE') or die();
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/**
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* Gzip format adapter for the JArchive class
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*
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* This class is inspired from and draws heavily in code and concept from the Compress package of
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* The Horde Project <http://www.horde.org>
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*
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* @contributor Michael Slusarz <slusarz@horde.org>
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* @contributor Michael Cochrane <mike@graftonhall.co.nz>
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*
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* @package Joomla.Framework
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* @subpackage FileSystem
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* @since 1.5
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*/
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class JArchiveGzip extends JObject
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{
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/**
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* Gzip file flags.
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* @var array
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*/
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var $_flags = array (
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'FTEXT' => 0x01,
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'FHCRC' => 0x02,
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'FEXTRA' => 0x04,
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'FNAME' => 0x08,
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'FCOMMENT' => 0x10
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);
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/**
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* Gzip file data buffer
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* @var string
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*/
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var $_data = null;
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/**
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* Extract a Gzip compressed file to a given path
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*
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* @access public
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* @param string $archive Path to ZIP archive to extract
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* @param string $destination Path to extract archive to
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* @param array $options Extraction options [unused]
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* @return boolean True if successful
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* @since 1.5
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*/
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function extract($archive, $destination, $options = array ())
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{
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// Initialize variables
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$this->_data = null;
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if (!extension_loaded('zlib')) {
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$this->set('error.message', 'Zlib Not Supported');
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return JError::raiseWarning(100, $this->get('error.message'));
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}
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if (!$this->_data = JFile::read($archive)) {
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$this->set('error.message', 'Unable to read archive');
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return JError::raiseWarning(100, $this->get('error.message'));
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}
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$position = $this->_getFilePosition();
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$buffer = gzinflate(substr($this->_data, $position, strlen($this->_data) - $position));
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if (empty ($buffer)) {
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$this->set('error.message', 'Unable to decompress data');
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return JError::raiseWarning(100, $this->get('error.message'));
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}
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if (JFile::write($destination, $buffer) === false) {
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$this->set('error.message', 'Unable to write archive');
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return JError::raiseWarning(100, $this->get('error.message'));
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}
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return true;
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}
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/**
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* Get file data offset for archive
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*
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* @access public
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* @return int Data position marker for archive
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* @since 1.5
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*/
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function _getFilePosition()
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{
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// gzipped file... unpack it first
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$position = 0;
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$info = @ unpack('CCM/CFLG/VTime/CXFL/COS', substr($this->_data, $position +2));
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if (!$info) {
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$this->set('error.message', 'Unable to decompress data');
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return false;
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}
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$position += 10;
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if ($info['FLG'] & $this->_flags['FEXTRA']) {
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$XLEN = unpack('vLength', substr($this->_data, $position +0, 2));
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$XLEN = $XLEN['Length'];
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$position += $XLEN +2;
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}
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if ($info['FLG'] & $this->_flags['FNAME']) {
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$filenamePos = strpos($this->_data, "\x0", $position);
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$filename = substr($this->_data, $position, $filenamePos - $position);
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$position = $filenamePos +1;
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}
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if ($info['FLG'] & $this->_flags['FCOMMENT']) {
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$commentPos = strpos($this->_data, "\x0", $position);
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$comment = substr($this->_data, $position, $commentPos - $position);
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$position = $commentPos +1;
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}
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if ($info['FLG'] & $this->_flags['FHCRC']) {
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$hcrc = unpack('vCRC', substr($this->_data, $position +0, 2));
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$hcrc = $hcrc['CRC'];
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$position += 2;
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}
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return $position;
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}
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}
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