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<?php /** * @package Joomla.Platform * @subpackage Archive * * @copyright Copyright (C) 2005 - 2020 Open Source Matters, Inc. All rights reserved. * @license GNU General Public License version 2 or later; see LICENSE */ defined('JPATH_PLATFORM') or die; jimport('joomla.filesystem.file'); /** * 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 <https://www.horde.org> * * @contributor Michael Slusarz <slusarz@horde.org> * @contributor Michael Cochrane <mike@graftonhall.co.nz> * * @since 1.5 * @deprecated 4.0 use the Joomla\Archive\Gzip class instead */ class JArchiveGzip implements JArchiveExtractable { /** * Gzip file flags. * * @var array * @since 1.5 */ private $_flags = array('FTEXT' => 0x01, 'FHCRC' => 0x02, 'FEXTRA' => 0x04, 'FNAME' => 0x08, 'FCOMMENT' => 0x10); /** * Gzip file data buffer * * @var string * @since 1.5 */ private $_data = null; /** * Extract a Gzip compressed file to a given path * * @param string $archive Path to ZIP archive to extract * @param string $destination Path to extract archive to * @param array $options Extraction options [unused] * * @return boolean True if successful * * @since 1.5 * @throws RuntimeException */ public function extract($archive, $destination, array $options = array()) { $this->_data = null; if (!extension_loaded('zlib')) { return $this->raiseWarning(100, 'The zlib extension is not available.'); } if (isset($options['use_streams']) && $options['use_streams'] != false) { return $this->extractStream($archive, $destination, $options); } $this->_data = file_get_contents($archive); if (!$this->_data) { return $this->raiseWarning(100, 'Unable to read archive'); } $position = $this->_getFilePosition(); $buffer = gzinflate(substr($this->_data, $position, strlen($this->_data) - $position)); if (empty($buffer)) { return $this->raiseWarning(100, 'Unable to decompress data'); } if (JFile::write($destination, $buffer) === false) { return $this->raiseWarning(100, 'Unable to write archive'); } return true; } /** * Method to extract archive using stream objects * * @param string $archive Path to ZIP archive to extract * @param string $destination Path to extract archive to * @param array $options Extraction options [unused] * * @return boolean True if successful * * @since 3.6.0 */ protected function extractStream($archive, $destination, $options = array()) { // New style! streams! $input = JFactory::getStream(); // Use gz $input->set('processingmethod', 'gz'); if (!$input->open($archive)) { return $this->raiseWarning(100, 'Unable to read archive (gz)'); } $output = JFactory::getStream(); if (!$output->open($destination, 'w')) { $input->close(); return $this->raiseWarning(100, 'Unable to write archive (gz)'); } do { $this->_data = $input->read($input->get('chunksize', 8196)); if ($this->_data && !$output->write($this->_data)) { $input->close(); return $this->raiseWarning(100, 'Unable to write file (gz)'); } } while ($this->_data); $output->close(); $input->close(); return true; } /** * Temporary private method to isolate JError from the extract method * This code should be removed when JError is removed. * * @param int $code The application-internal error code for this error * @param string $msg The error message, which may also be shown the user if need be. * * @return JException JException instance if JError class exists * * @since 3.6.0 * @throws RuntimeException if JError class does not exist */ private function raiseWarning($code, $msg) { if (class_exists('JError')) { return JError::raiseWarning($code, $msg); } throw new RuntimeException($msg); } /** * Tests whether this adapter can unpack files on this computer. * * @return boolean True if supported * * @since 2.5.0 */ public static function isSupported() { return extension_loaded('zlib'); } /** * Get file data offset for archive * * @return integer Data position marker for archive * * @since 1.5 * @throws RuntimeException */ public function _getFilePosition() { // Gzipped file... unpack it first $position = 0; $info = @ unpack('CCM/CFLG/VTime/CXFL/COS', substr($this->_data, $position + 2)); if (!$info) { return $this->raiseWarning(100, 'Unable to decompress data.'); } $position += 10; if ($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); $position = $filenamePos + 1; } if ($info['FLG'] & $this->_flags['FCOMMENT']) { $commentPos = strpos($this->_data, "\x0", $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; } }
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