joomla-platform / libraries / joomla / filesystem / archive / bzip2.php

<?php
/**
 * @package     Joomla.Platform
 * @subpackage  FileSystem
 *
 * @copyright   Copyright (C) 2005 - 2011 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.stream');

/**
 * Bzip2 format adapter for the JArchive class
 *
 * @package		Joomla.Platform
 * @subpackage	FileSystem
 * @since		11.1
 */
class JArchiveBzip2 extends JObject
{
	/**
	 * Bzip2 file data buffer
	 * @var string
	 */
	var $_data = null;

	/**
	 * Constructor tries to load the bz2 extension if not loaded
	 *
	 * @return	void
	 * @since	11.1
	 */
	public function __construct()
	{
		// Is bz2 extension loaded?  If not try to load it
		if (!extension_loaded('bz2')) {
			if (JPATH_ISWIN) {
				@ dl('php_bz2.dll');
			}
			else {
				@ dl('bz2.so');
			}
		}
	}

	/**
	* Extract a Bzip2 compressed file to a given path
	*
	* @param	string	$archive		Path to Bzip2 archive to extract
	* @param	string	$destination	Path to extract archive to
	* @param	array	$options		Extraction options [unused]
	*
	* @return	boolean	True if successful
	* @since	11.1
	*/
	public function extract($archive, $destination, $options = array ())
	{
		// Initialise variables.
		$this->_data = null;

		if (!extension_loaded('bz2')) {
			$this->set('error.message', JText::_('JLIB_FILESYSTEM_BZIP_NOT_SUPPORTED'));

			return JError::raiseWarning(100, $this->get('error.message'));
		}

		// New style! streams!
		$input = JFactory::getStream();
		// Use bzip
		$input->set('processingmethod', 'bz'); 

		if (!$input->open($archive)) {
			$this->set('error.message', JText::_('JLIB_FILESYSTEM_BZIP_UNABLE_TO_READ'));

			return JError::raiseWarning(100, $this->get('error.message'));
		}

		$output = JFactory::getStream();

		if (!$output->open($destination, 'w')) {
			$this->set('error.message', JText::_('JLIB_FILESYSTEM_BZIP_UNABLE_TO_WRITE'));
			// Close the previous file
			$input->close(); 

			return JError::raiseWarning(100, $this->get('error.message'));
		}

		$written = 0;
		do
		{
			$this->_data = $input->read($input->get('chunksize', 8196));
			if ($this->_data) {
				if (!$output->write($this->_data)) {
					$this->set('error.message', JText::_('JLIB_FILESYSTEM_BZIP_UNABLE_TO_WRITE_FILE'));

					return JError::raiseWarning(100, $this->get('error.message'));
				}
			}
		}
		while ($this->_data);

		$output->close();
		$input->close();

		return true;
	}
}
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