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libraries/joomla/archive/bzip2.php

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+<?php
+/**
+ * @package     Joomla.Platform
+ * @subpackage  Archive
+ *
+ * @copyright   Copyright (C) 2005 - 2013 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  Archive
+ * @since       11.1
+ */
+class JArchiveBzip2 implements JArchiveExtractable
+{
+	/**
+	 * Bzip2 file data buffer
+	 *
+	 * @var    string
+	 * @since  11.1
+	 */
+	private $_data = null;
+
+	/**
+	 * 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   $options      Extraction options [unused]
+	 *
+	 * @return  boolean  True if successful
+	 *
+	 * @since   11.1
+	 * @throws  RuntimeException
+	 */
+	public function extract($archive, $destination, array $options = array ())
+	{
+		$this->_data = null;
+
+		if (!extension_loaded('bz2'))
+		{
+			if (class_exists('JError'))
+			{
+				return JError::raiseWarning(100, 'The bz2 extension is not available.');
+			}
+			else
+			{
+				throw new RuntimeException('The bz2 extension is not available.');
+			}
+		}
+
+		if (!isset($options['use_streams']) || $options['use_streams'] == false)
+		{
+			// Old style: read the whole file and then parse it
+			$this->_data = file_get_contents($archive);
+
+			if (!$this->_data)
+			{
+				if (class_exists('JError'))
+				{
+					return JError::raiseWarning(100, 'Unable to read archive');
+				}
+				else
+				{
+					throw new RuntimeException('Unable to read archive');
+				}
+			}
+
+			$buffer = bzdecompress($this->_data);
+			unset($this->_data);
+
+			if (empty($buffer))
+			{
+				if (class_exists('JError'))
+				{
+					return JError::raiseWarning(100, 'Unable to decompress data');
+				}
+				else
+				{
+					throw new RuntimeException('Unable to decompress data');
+				}
+			}
+
+			if (JFile::write($destination, $buffer) === false)
+			{
+				if (class_exists('JError'))
+				{
+					return JError::raiseWarning(100, 'Unable to write archive');
+				}
+				else
+				{
+					throw new RuntimeException('Unable to write archive');
+				}
+			}
+
+		}
+		else
+		{
+			// New style! streams!
+			$input = JFactory::getStream();
+
+			// Use bzip
+			$input->set('processingmethod', 'bz');
+
+			if (!$input->open($archive))
+			{
+				if (class_exists('JError'))
+				{
+					return JError::raiseWarning(100, 'Unable to read archive (bz2)');
+				}
+				else
+				{
+					throw new RuntimeException('Unable to read archive (bz2)');
+				}
+			}
+
+			$output = JFactory::getStream();
+
+			if (!$output->open($destination, 'w'))
+			{
+				$input->close();
+
+				if (class_exists('JError'))
+				{
+					return JError::raiseWarning(100, 'Unable to write archive (bz2)');
+				}
+				else
+				{
+					throw new RuntimeException('Unable to write archive (bz2)');
+				}
+			}
+
+			do
+			{
+				$this->_data = $input->read($input->get('chunksize', 8196));
+
+				if ($this->_data)
+				{
+					if (!$output->write($this->_data))
+					{
+						$input->close();
+
+						if (class_exists('JError'))
+						{
+							return JError::raiseWarning(100, 'Unable to write archive (bz2)');
+						}
+						else
+						{
+							throw new RuntimeException('Unable to write archive (bz2)');
+						}
+					}
+				}
+			}
+			while ($this->_data);
+
+			$output->close();
+			$input->close();
+		}
+
+		return true;
+	}
+
+	/**
+	 * Tests whether this adapter can unpack files on this computer.
+	 *
+	 * @return  boolean  True if supported
+	 *
+	 * @since   11.3
+	 */
+	public static function isSupported()
+	{
+		return extension_loaded('bz2');
+	}
+}