<?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;
    }
}