/administrator/components/com_akeeba/restore.php

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<?php
/**
 * Akeeba Restore
 * A JSON-powered JPA, JPS and ZIP archive extraction library
 * 
 * @copyright 2010-2012 Nicholas K. Dionysopoulos / AkeebaBackup.com
 * @license GNU GPL v2 or - at your option - any later version
 * @package akeebabackup
 * @subpackage kickstart
 */

define('_AKEEBA_RESTORATION', 1);
defined('DS') or define('DS', DIRECTORY_SEPARATOR);

// Unarchiver run states
define('AK_STATE_NOFILE',	0); // File header not read yet
define('AK_STATE_HEADER',	1); // File header read; ready to process data
define('AK_STATE_DATA',		2); // Processing file data
define('AK_STATE_DATAREAD',	3); // Finished processing file data; ready to post-process
define('AK_STATE_POSTPROC',	4); // Post-processing
define('AK_STATE_DONE',		5); // Done with post-processing

/* Windows system detection */
if(!defined('_AKEEBA_IS_WINDOWS'))
{
	if (function_exists('php_uname'))
		define('_AKEEBA_IS_WINDOWS', stristr(php_uname(), 'windows'));
	else
		define('_AKEEBA_IS_WINDOWS', DIRECTORY_SEPARATOR == '\\');
}

// Make sure the locale is correct for basename() to work
if(function_exists('setlocale'))
{
	@setlocale(LC_ALL, 'en_US.UTF8');
}

// fnmatch not available on non-POSIX systems
// Thanks to soywiz@php.net for this usefull alternative function [http://gr2.php.net/fnmatch]
if (!function_exists('fnmatch')) {
	function fnmatch($pattern, $string) {
		return @preg_match(
			'/^' . strtr(addcslashes($pattern, '/\\.+^$(){}=!<>|'),
		array('*' => '.*', '?' => '.?')) . '$/i', $string
		);
	}
}

// Unicode-safe binary data length function
if(function_exists('mb_strlen')) {
	function akstringlen($string) { return mb_strlen($string,'8bit'); }
} else {
	function akstringlen($string) { return strlen($string); }
}

/**
 * Gets a query parameter from GET or POST data
 * @param $key
 * @param $default
 */
function getQueryParam( $key, $default = null )
{
	$value = null;

	if(array_key_exists($key, $_REQUEST)) {
		$value = $_REQUEST[$key];
	} elseif(array_key_exists($key, $_POST)) {
		$value = $_POST[$key];
	} elseif(array_key_exists($key, $_GET)) {
		$value = $_GET[$key];
	} else {
		return $default;
	}

	if(get_magic_quotes_gpc() && !is_null($value)) $value=stripslashes($value);

	return $value;
}

// Debugging function
function debugMsg($msg)
{
	if(!defined('KSDEBUG')) return;
	$fp = fopen('debug.txt','at');
	fwrite($fp, $msg."\n");
	fclose($fp);
}

/**
 * Akeeba Backup's JSON compatibility layer
 *
 * On systems where json_encode and json_decode are not available, Akeeba
 * Backup will attempt to use PEAR's Services_JSON library to emulate them.
 * A copy of this library is included in this file and will be used if and
 * only if it isn't already loaded, e.g. due to PEAR's auto-loading, or a
 * 3PD extension loading it for its own purposes.
 */

/**
 * Converts to and from JSON format.
 *
 * JSON (JavaScript Object Notation) is a lightweight data-interchange
 * format. It is easy for humans to read and write. It is easy for machines
 * to parse and generate. It is based on a subset of the JavaScript
 * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
 * This feature can also be found in  Python. JSON is a text format that is
 * completely language independent but uses conventions that are familiar
 * to programmers of the C-family of languages, including C, C++, C#, Java,
 * JavaScript, Perl, TCL, and many others. These properties make JSON an
 * ideal data-interchange language.
 *
 * This package provides a simple encoder and decoder for JSON notation. It
 * is intended for use with client-side Javascript applications that make
 * use of HTTPRequest to perform server communication functions - data can
 * be encoded into JSON notation for use in a client-side javascript, or
 * decoded from incoming Javascript requests. JSON format is native to
 * Javascript, and can be directly eval()'ed with no further parsing
 * overhead
 *
 * All strings should be in ASCII or UTF-8 format!
 *
 * LICENSE: Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met: Redistributions of source code must retain the
 * above copyright notice, this list of conditions and the following
 * disclaimer. Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * @category
 * @package     Services_JSON
 * @author      Michal Migurski <mike-json@teczno.com>
 * @author      Matt Knapp <mdknapp[at]gmail[dot]com>
 * @author      Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
 * @copyright   2005 Michal Migurski
 * @version     CVS: $Id: restore.php 612 2011-05-19 08:26:26Z nikosdion $
 * @license     http://www.opensource.org/licenses/bsd-license.php
 * @link        http://pear.php.net/pepr/pepr-proposal-show.php?id=198
 */

if(!defined('JSON_FORCE_OBJECT'))
{
	define('JSON_FORCE_OBJECT', 1);
}

if(!defined('SERVICES_JSON_SLICE'))
{
	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_SLICE',   1);

	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_IN_STR',  2);

	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_IN_ARR',  3);

	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_IN_OBJ',  4);

	/**
	 * Marker constant for Services_JSON::decode(), used to flag stack state
	 */
	define('SERVICES_JSON_IN_CMT', 5);

	/**
	 * Behavior switch for Services_JSON::decode()
	 */
	define('SERVICES_JSON_LOOSE_TYPE', 16);

	/**
	 * Behavior switch for Services_JSON::decode()
	 */
	define('SERVICES_JSON_SUPPRESS_ERRORS', 32);
}

/**
 * Converts to and from JSON format.
 *
 * Brief example of use:
 *
 * <code>
 * // create a new instance of Services_JSON
 * $json = new Services_JSON();
 *
 * // convert a complexe value to JSON notation, and send it to the browser
 * $value = array('foo', 'bar', array(1, 2, 'baz'), array(3, array(4)));
 * $output = $json->encode($value);
 *
 * print($output);
 * // prints: ["foo","bar",[1,2,"baz"],[3,[4]]]
 *
 * // accept incoming POST data, assumed to be in JSON notation
 * $input = file_get_contents('php://input', 1000000);
 * $value = $json->decode($input);
 * </code>
 */
if(!class_exists('Akeeba_Services_JSON'))
{
	class Akeeba_Services_JSON
	{
	   /**
	    * constructs a new JSON instance
	    *
	    * @param    int     $use    object behavior flags; combine with boolean-OR
	    *
	    *                           possible values:
	    *                           - SERVICES_JSON_LOOSE_TYPE:  loose typing.
	    *                                   "{...}" syntax creates associative arrays
	    *                                   instead of objects in decode().
	    *                           - SERVICES_JSON_SUPPRESS_ERRORS:  error suppression.
	    *                                   Values which can't be encoded (e.g. resources)
	    *                                   appear as NULL instead of throwing errors.
	    *                                   By default, a deeply-nested resource will
	    *                                   bubble up with an error, so all return values
	    *                                   from encode() should be checked with isError()
	    */
	    function Akeeba_Services_JSON($use = 0)
	    {
	        $this->use = $use;
	    }

	   /**
	    * convert a string from one UTF-16 char to one UTF-8 char
	    *
	    * Normally should be handled by mb_convert_encoding, but
	    * provides a slower PHP-only method for installations
	    * that lack the multibye string extension.
	    *
	    * @param    string  $utf16  UTF-16 character
	    * @return   string  UTF-8 character
	    * @access   private
	    */
	    function utf162utf8($utf16)
	    {
	        // oh please oh please oh please oh please oh please
	        if(function_exists('mb_convert_encoding')) {
	            return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
	        }

	        $bytes = (ord($utf16{0}) << 8) | ord($utf16{1});

	        switch(true) {
	            case ((0x7F & $bytes) == $bytes):
	                // this case should never be reached, because we are in ASCII range
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr(0x7F & $bytes);

	            case (0x07FF & $bytes) == $bytes:
	                // return a 2-byte UTF-8 character
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr(0xC0 | (($bytes >> 6) & 0x1F))
	                     . chr(0x80 | ($bytes & 0x3F));

	            case (0xFFFF & $bytes) == $bytes:
	                // return a 3-byte UTF-8 character
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr(0xE0 | (($bytes >> 12) & 0x0F))
	                     . chr(0x80 | (($bytes >> 6) & 0x3F))
	                     . chr(0x80 | ($bytes & 0x3F));
	        }

	        // ignoring UTF-32 for now, sorry
	        return '';
	    }

	   /**
	    * convert a string from one UTF-8 char to one UTF-16 char
	    *
	    * Normally should be handled by mb_convert_encoding, but
	    * provides a slower PHP-only method for installations
	    * that lack the multibye string extension.
	    *
	    * @param    string  $utf8   UTF-8 character
	    * @return   string  UTF-16 character
	    * @access   private
	    */
	    function utf82utf16($utf8)
	    {
	        // oh please oh please oh please oh please oh please
	        if(function_exists('mb_convert_encoding')) {
	            return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
	        }

	        switch(strlen($utf8)) {
	            case 1:
	                // this case should never be reached, because we are in ASCII range
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return $utf8;

	            case 2:
	                // return a UTF-16 character from a 2-byte UTF-8 char
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr(0x07 & (ord($utf8{0}) >> 2))
	                     . chr((0xC0 & (ord($utf8{0}) << 6))
	                         | (0x3F & ord($utf8{1})));

	            case 3:
	                // return a UTF-16 character from a 3-byte UTF-8 char
	                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                return chr((0xF0 & (ord($utf8{0}) << 4))
	                         | (0x0F & (ord($utf8{1}) >> 2)))
	                     . chr((0xC0 & (ord($utf8{1}) << 6))
	                         | (0x7F & ord($utf8{2})));
	        }

	        // ignoring UTF-32 for now, sorry
	        return '';
	    }

	   /**
	    * encodes an arbitrary variable into JSON format
	    *
	    * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
	    *                           see argument 1 to Services_JSON() above for array-parsing behavior.
	    *                           if var is a strng, note that encode() always expects it
	    *                           to be in ASCII or UTF-8 format!
	    *
	    * @return   mixed   JSON string representation of input var or an error if a problem occurs
	    * @access   public
	    */
	    function encode($var)
	    {
	        switch (gettype($var)) {
	            case 'boolean':
	                return $var ? 'true' : 'false';

	            case 'NULL':
	                return 'null';

	            case 'integer':
	                return (int) $var;

	            case 'double':
	            case 'float':
	                return (float) $var;

	            case 'string':
	                // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
	                $ascii = '';
	                $strlen_var = strlen($var);

	               /*
	                * Iterate over every character in the string,
	                * escaping with a slash or encoding to UTF-8 where necessary
	                */
	                for ($c = 0; $c < $strlen_var; ++$c) {

	                    $ord_var_c = ord($var{$c});

	                    switch (true) {
	                        case $ord_var_c == 0x08:
	                            $ascii .= '\b';
	                            break;
	                        case $ord_var_c == 0x09:
	                            $ascii .= '\t';
	                            break;
	                        case $ord_var_c == 0x0A:
	                            $ascii .= '\n';
	                            break;
	                        case $ord_var_c == 0x0C:
	                            $ascii .= '\f';
	                            break;
	                        case $ord_var_c == 0x0D:
	                            $ascii .= '\r';
	                            break;

	                        case $ord_var_c == 0x22:
	                        case $ord_var_c == 0x2F:
	                        case $ord_var_c == 0x5C:
	                            // double quote, slash, slosh
	                            $ascii .= '\\'.$var{$c};
	                            break;

	                        case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
	                            // characters U-00000000 - U-0000007F (same as ASCII)
	                            $ascii .= $var{$c};
	                            break;

	                        case (($ord_var_c & 0xE0) == 0xC0):
	                            // characters U-00000080 - U-000007FF, mask 110XXXXX
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
	                            $c += 1;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;

	                        case (($ord_var_c & 0xF0) == 0xE0):
	                            // characters U-00000800 - U-0000FFFF, mask 1110XXXX
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c,
	                                         ord($var{$c + 1}),
	                                         ord($var{$c + 2}));
	                            $c += 2;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;

	                        case (($ord_var_c & 0xF8) == 0xF0):
	                            // characters U-00010000 - U-001FFFFF, mask 11110XXX
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c,
	                                         ord($var{$c + 1}),
	                                         ord($var{$c + 2}),
	                                         ord($var{$c + 3}));
	                            $c += 3;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;

	                        case (($ord_var_c & 0xFC) == 0xF8):
	                            // characters U-00200000 - U-03FFFFFF, mask 111110XX
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c,
	                                         ord($var{$c + 1}),
	                                         ord($var{$c + 2}),
	                                         ord($var{$c + 3}),
	                                         ord($var{$c + 4}));
	                            $c += 4;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;

	                        case (($ord_var_c & 0xFE) == 0xFC):
	                            // characters U-04000000 - U-7FFFFFFF, mask 1111110X
	                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                            $char = pack('C*', $ord_var_c,
	                                         ord($var{$c + 1}),
	                                         ord($var{$c + 2}),
	                                         ord($var{$c + 3}),
	                                         ord($var{$c + 4}),
	                                         ord($var{$c + 5}));
	                            $c += 5;
	                            $utf16 = $this->utf82utf16($char);
	                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
	                            break;
	                    }
	                }

	                return '"'.$ascii.'"';

	            case 'array':
	               /*
	                * As per JSON spec if any array key is not an integer
	                * we must treat the the whole array as an object. We
	                * also try to catch a sparsely populated associative
	                * array with numeric keys here because some JS engines
	                * will create an array with empty indexes up to
	                * max_index which can cause memory issues and because
	                * the keys, which may be relevant, will be remapped
	                * otherwise.
	                *
	                * As per the ECMA and JSON specification an object may
	                * have any string as a property. Unfortunately due to
	                * a hole in the ECMA specification if the key is a
	                * ECMA reserved word or starts with a digit the
	                * parameter is only accessible using ECMAScript's
	                * bracket notation.
	                */

	                // treat as a JSON object
	                if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
	                    $properties = array_map(array($this, 'name_value'),
	                                            array_keys($var),
	                                            array_values($var));

	                    foreach($properties as $property) {
	                        if(Akeeba_Services_JSON::isError($property)) {
	                            return $property;
	                        }
	                    }

	                    return '{' . join(',', $properties) . '}';
	                }

	                // treat it like a regular array
	                $elements = array_map(array($this, 'encode'), $var);

	                foreach($elements as $element) {
	                    if(Akeeba_Services_JSON::isError($element)) {
	                        return $element;
	                    }
	                }

	                return '[' . join(',', $elements) . ']';

	            case 'object':
	                $vars = get_object_vars($var);

	                $properties = array_map(array($this, 'name_value'),
	                                        array_keys($vars),
	                                        array_values($vars));

	                foreach($properties as $property) {
	                    if(Akeeba_Services_JSON::isError($property)) {
	                        return $property;
	                    }
	                }

	                return '{' . join(',', $properties) . '}';

	            default:
	                return ($this->use & SERVICES_JSON_SUPPRESS_ERRORS)
	                    ? 'null'
	                    : new Akeeba_Services_JSON_Error(gettype($var)." can not be encoded as JSON string");
	        }
	    }

	   /**
	    * array-walking function for use in generating JSON-formatted name-value pairs
	    *
	    * @param    string  $name   name of key to use
	    * @param    mixed   $value  reference to an array element to be encoded
	    *
	    * @return   string  JSON-formatted name-value pair, like '"name":value'
	    * @access   private
	    */
	    function name_value($name, $value)
	    {
	        $encoded_value = $this->encode($value);

	        if(Akeeba_Services_JSON::isError($encoded_value)) {
	            return $encoded_value;
	        }

	        return $this->encode(strval($name)) . ':' . $encoded_value;
	    }

	   /**
	    * reduce a string by removing leading and trailing comments and whitespace
	    *
	    * @param    $str    string      string value to strip of comments and whitespace
	    *
	    * @return   string  string value stripped of comments and whitespace
	    * @access   private
	    */
	    function reduce_string($str)
	    {
	        $str = preg_replace(array(

	                // eliminate single line comments in '// ...' form
	                '#^\s*//(.+)$#m',

	                // eliminate multi-line comments in '/* ... */' form, at start of string
	                '#^\s*/\*(.+)\*/#Us',

	                // eliminate multi-line comments in '/* ... */' form, at end of string
	                '#/\*(.+)\*/\s*$#Us'

	            ), '', $str);

	        // eliminate extraneous space
	        return trim($str);
	    }

	   /**
	    * decodes a JSON string into appropriate variable
	    *
	    * @param    string  $str    JSON-formatted string
	    *
	    * @return   mixed   number, boolean, string, array, or object
	    *                   corresponding to given JSON input string.
	    *                   See argument 1 to Akeeba_Services_JSON() above for object-output behavior.
	    *                   Note that decode() always returns strings
	    *                   in ASCII or UTF-8 format!
	    * @access   public
	    */
	    function decode($str)
	    {
	        $str = $this->reduce_string($str);

	        switch (strtolower($str)) {
	            case 'true':
	                return true;

	            case 'false':
	                return false;

	            case 'null':
	                return null;

	            default:
	                $m = array();

	                if (is_numeric($str)) {
	                    // Lookie-loo, it's a number

	                    // This would work on its own, but I'm trying to be
	                    // good about returning integers where appropriate:
	                    // return (float)$str;

	                    // Return float or int, as appropriate
	                    return ((float)$str == (integer)$str)
	                        ? (integer)$str
	                        : (float)$str;

	                } elseif (preg_match('/^("|\').*(\1)$/s', $str, $m) && $m[1] == $m[2]) {
	                    // STRINGS RETURNED IN UTF-8 FORMAT
	                    $delim = substr($str, 0, 1);
	                    $chrs = substr($str, 1, -1);
	                    $utf8 = '';
	                    $strlen_chrs = strlen($chrs);

	                    for ($c = 0; $c < $strlen_chrs; ++$c) {

	                        $substr_chrs_c_2 = substr($chrs, $c, 2);
	                        $ord_chrs_c = ord($chrs{$c});

	                        switch (true) {
	                            case $substr_chrs_c_2 == '\b':
	                                $utf8 .= chr(0x08);
	                                ++$c;
	                                break;
	                            case $substr_chrs_c_2 == '\t':
	                                $utf8 .= chr(0x09);
	                                ++$c;
	                                break;
	                            case $substr_chrs_c_2 == '\n':
	                                $utf8 .= chr(0x0A);
	                                ++$c;
	                                break;
	                            case $substr_chrs_c_2 == '\f':
	                                $utf8 .= chr(0x0C);
	                                ++$c;
	                                break;
	                            case $substr_chrs_c_2 == '\r':
	                                $utf8 .= chr(0x0D);
	                                ++$c;
	                                break;

	                            case $substr_chrs_c_2 == '\\"':
	                            case $substr_chrs_c_2 == '\\\'':
	                            case $substr_chrs_c_2 == '\\\\':
	                            case $substr_chrs_c_2 == '\\/':
	                                if (($delim == '"' && $substr_chrs_c_2 != '\\\'') ||
	                                   ($delim == "'" && $substr_chrs_c_2 != '\\"')) {
	                                    $utf8 .= $chrs{++$c};
	                                }
	                                break;

	                            case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $c, 6)):
	                                // single, escaped unicode character
	                                $utf16 = chr(hexdec(substr($chrs, ($c + 2), 2)))
	                                       . chr(hexdec(substr($chrs, ($c + 4), 2)));
	                                $utf8 .= $this->utf162utf8($utf16);
	                                $c += 5;
	                                break;

	                            case ($ord_chrs_c >= 0x20) && ($ord_chrs_c <= 0x7F):
	                                $utf8 .= $chrs{$c};
	                                break;

	                            case ($ord_chrs_c & 0xE0) == 0xC0:
	                                // characters U-00000080 - U-000007FF, mask 110XXXXX
	                                //see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 2);
	                                ++$c;
	                                break;

	                            case ($ord_chrs_c & 0xF0) == 0xE0:
	                                // characters U-00000800 - U-0000FFFF, mask 1110XXXX
	                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 3);
	                                $c += 2;
	                                break;

	                            case ($ord_chrs_c & 0xF8) == 0xF0:
	                                // characters U-00010000 - U-001FFFFF, mask 11110XXX
	                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 4);
	                                $c += 3;
	                                break;

	                            case ($ord_chrs_c & 0xFC) == 0xF8:
	                                // characters U-00200000 - U-03FFFFFF, mask 111110XX
	                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 5);
	                                $c += 4;
	                                break;

	                            case ($ord_chrs_c & 0xFE) == 0xFC:
	                                // characters U-04000000 - U-7FFFFFFF, mask 1111110X
	                                // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
	                                $utf8 .= substr($chrs, $c, 6);
	                                $c += 5;
	                                break;

	                        }

	                    }

	                    return $utf8;

	                } elseif (preg_match('/^\[.*\]$/s', $str) || preg_match('/^\{.*\}$/s', $str)) {
	                    // array, or object notation

	                    if ($str{0} == '[') {
	                        $stk = array(SERVICES_JSON_IN_ARR);
	                        $arr = array();
	                    } else {
	                        if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
	                            $stk = array(SERVICES_JSON_IN_OBJ);
	                            $obj = array();
	                        } else {
	                            $stk = array(SERVICES_JSON_IN_OBJ);
	                            $obj = new stdClass();
	                        }
	                    }

	                    array_push($stk, array('what'  => SERVICES_JSON_SLICE,
	                                           'where' => 0,
	                                           'delim' => false));

	                    $chrs = substr($str, 1, -1);
	                    $chrs = $this->reduce_string($chrs);

	                    if ($chrs == '') {
	                        if (reset($stk) == SERVICES_JSON_IN_ARR) {
	                            return $arr;

	                        } else {
	                            return $obj;

	                        }
	                    }

	                    //print("\nparsing {$chrs}\n");

	                    $strlen_chrs = strlen($chrs);

	                    for ($c = 0; $c <= $strlen_chrs; ++$c) {

	                        $top = end($stk);
	                        $substr_chrs_c_2 = substr($chrs, $c, 2);

	                        if (($c == $strlen_chrs) || (($chrs{$c} == ',') && ($top['what'] == SERVICES_JSON_SLICE))) {
	                            // found a comma that is not inside a string, array, etc.,
	                            // OR we've reached the end of the character list
	                            $slice = substr($chrs, $top['where'], ($c - $top['where']));
	                            array_push($stk, array('what' => SERVICES_JSON_SLICE, 'where' => ($c + 1), 'delim' => false));
	                            //print("Found split at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");

	                            if (reset($stk) == SERVICES_JSON_IN_ARR) {
	                                // we are in an array, so just push an element onto the stack
	                                array_push($arr, $this->decode($slice));

	                            } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
	                                // we are in an object, so figure
	                                // out the property name and set an
	                                // element in an associative array,
	                                // for now
	                                $parts = array();

	                                if (preg_match('/^\s*(["\'].*[^\\\]["\'])\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
	                                    // "name":value pair
	                                    $key = $this->decode($parts[1]);
	                                    $val = $this->decode($parts[2]);

	                                    if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
	                                        $obj[$key] = $val;
	                                    } else {
	                                        $obj->$key = $val;
	                                    }
	                                } elseif (preg_match('/^\s*(\w+)\s*:\s*(\S.*),?$/Uis', $slice, $parts)) {
	                                    // name:value pair, where name is unquoted
	                                    $key = $parts[1];
	                                    $val = $this->decode($parts[2]);

	                                    if ($this->use & SERVICES_JSON_LOOSE_TYPE) {
	                                        $obj[$key] = $val;
	                                    } else {
	                                        $obj->$key = $val;
	                                    }
	                                }

	                            }

	                        } elseif ((($chrs{$c} == '"') || ($chrs{$c} == "'")) && ($top['what'] != SERVICES_JSON_IN_STR)) {
	                            // found a quote, and we are not inside a string
	                            array_push($stk, array('what' => SERVICES_JSON_IN_STR, 'where' => $c, 'delim' => $chrs{$c}));
	                            //print("Found start of string at {$c}\n");

	                        } elseif (($chrs{$c} == $top['delim']) &&
	                                 ($top['what'] == SERVICES_JSON_IN_STR) &&
	                                 ((strlen(substr($chrs, 0, $c)) - strlen(rtrim(substr($chrs, 0, $c), '\\'))) % 2 != 1)) {
	                            // found a quote, we're in a string, and it's not escaped
	                            // we know that it's not escaped becase there is _not_ an
	                            // odd number of backslashes at the end of the string so far
	                            array_pop($stk);
	                            //print("Found end of string at {$c}: ".substr($chrs, $top['where'], (1 + 1 + $c - $top['where']))."\n");

	                        } elseif (($chrs{$c} == '[') &&
	                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
	                            // found a left-bracket, and we are in an array, object, or slice
	                            array_push($stk, array('what' => SERVICES_JSON_IN_ARR, 'where' => $c, 'delim' => false));
	                            //print("Found start of array at {$c}\n");

	                        } elseif (($chrs{$c} == ']') && ($top['what'] == SERVICES_JSON_IN_ARR)) {
	                            // found a right-bracket, and we're in an array
	                            array_pop($stk);
	                            //print("Found end of array at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");

	                        } elseif (($chrs{$c} == '{') &&
	                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
	                            // found a left-brace, and we are in an array, object, or slice
	                            array_push($stk, array('what' => SERVICES_JSON_IN_OBJ, 'where' => $c, 'delim' => false));
	                            //print("Found start of object at {$c}\n");

	                        } elseif (($chrs{$c} == '}') && ($top['what'] == SERVICES_JSON_IN_OBJ)) {
	                            // found a right-brace, and we're in an object
	                            array_pop($stk);
	                            //print("Found end of object at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");

	                        } elseif (($substr_chrs_c_2 == '/*') &&
	                                 in_array($top['what'], array(SERVICES_JSON_SLICE, SERVICES_JSON_IN_ARR, SERVICES_JSON_IN_OBJ))) {
	                            // found a comment start, and we are in an array, object, or slice
	                            array_push($stk, array('what' => SERVICES_JSON_IN_CMT, 'where' => $c, 'delim' => false));
	                            $c++;
	                            //print("Found start of comment at {$c}\n");

	                        } elseif (($substr_chrs_c_2 == '*/') && ($top['what'] == SERVICES_JSON_IN_CMT)) {
	                            // found a comment end, and we're in one now
	                            array_pop($stk);
	                            $c++;

	                            for ($i = $top['where']; $i <= $c; ++$i)
	                                $chrs = substr_replace($chrs, ' ', $i, 1);

	                            //print("Found end of comment at {$c}: ".substr($chrs, $top['where'], (1 + $c - $top['where']))."\n");

	                        }

	                    }

	                    if (reset($stk) == SERVICES_JSON_IN_ARR) {
	                        return $arr;

	                    } elseif (reset($stk) == SERVICES_JSON_IN_OBJ) {
	                        return $obj;

	                    }

	                }
	        }
	    }

	    function isError($data, $code = null)
	    {
	        if (class_exists('pear')) {
	            return PEAR::isError($data, $code);
	        } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
	                                 is_subclass_of($data, 'services_json_error'))) {
	            return true;
	        }

	        return false;
	    }
	}

    class Akeeba_Services_JSON_Error
    {
        function Akeeba_Services_JSON_Error($message = 'unknown error', $code = null,
                                     $mode = null, $options = null, $userinfo = null)
        {

        }
    }
}

if(!function_exists('json_encode'))
{
	function json_encode($value, $options = 0) {
		$flags = SERVICES_JSON_LOOSE_TYPE;
		if( $options & JSON_FORCE_OBJECT ) $flags = 0;
		$encoder = new Akeeba_Services_JSON($flags);
		return $encoder->encode($value);
	}
}

if(!function_exists('json_decode'))
{
	function json_decode($value, $assoc = false)
	{
		$flags = 0;
		if($assoc) $flags = SERVICES_JSON_LOOSE_TYPE;
		$decoder = new Akeeba_Services_JSON($flags);
		return $decoder->decode($value);
	}
}

/**
 * The base class of Akeeba Engine objects. Allows for error and warnings logging
 * and propagation. Largely based on the Joomla! 1.5 JObject class.
 */
abstract class AKAbstractObject
{
	/** @var	array	An array of errors */
	private $_errors = array();

	/** @var	array	The queue size of the $_errors array. Set to 0 for infinite size. */
	protected $_errors_queue_size = 0;

	/** @var	array	An array of warnings */
	private $_warnings = array();

	/** @var	array	The queue size of the $_warnings array. Set to 0 for infinite size. */
	protected $_warnings_queue_size = 0;

	/**
	 * Public constructor, makes sure we are instanciated only by the factory class
	 */
	public function __construct()
	{
		/*
		// Assisted Singleton pattern
		if(function_exists('debug_backtrace'))
		{
			$caller=debug_backtrace();
			if(
				($caller[1]['class'] != 'AKFactory') &&
				($caller[2]['class'] != 'AKFactory') &&
				($caller[3]['class'] != 'AKFactory') &&
				($caller[4]['class'] != 'AKFactory')
			) {
				var_dump(debug_backtrace());
				trigger_error("You can't create direct descendants of ".__CLASS__, E_USER_ERROR);
			}
		}
		*/
	}

	/**
	 * Get the most recent error message
	 * @param	integer	$i Optional error index
	 * @return	string	Error message
	 */
	public function getError($i = null)
	{
		return $this->getItemFromArray($this->_errors, $i);
	}

	/**
	 * Return all errors, if any
	 * @return	array	Array of error messages
	 */
	public function getErrors()
	{
		return $this->_errors;
	}

	/**
	 * Add an error message
	 * @param	string $error Error message
	 */
	public function setError($error)
	{
		if($this->_errors_queue_size > 0)
		{
			if(count($this->_errors) >= $this->_errors_queue_size)
			{
				array_shift($this->_errors);
			}
		}
		array_push($this->_errors, $error);
	}

	/**
	 * Resets all error messages
	 */
	public function resetErrors()
	{
		$this->_errors = array();
	}

	/**
	 * Get the most recent warning message
	 * @param	integer	$i Optional warning index
	 * @return	string	Error message
	 */
	public function getWarning($i = null)
	{
		return $this->getItemFromArray($this->_warnings, $i);
	}

	/**
	 * Return all warnings, if any
	 * @return	array	Array of error messages
	 */
	public function getWarnings()
	{
		return $this->_warnings;
	}

	/**
	 * Add an error message
	 * @param	string $error Error message
	 */
	public function setWarning($warning)
	{
		if($this->_warnings_queue_size > 0)
		{
			if(count($this->_warnings) >= $this->_warnings_queue_size)
			{
				array_shift($this->_warnings);
			}
		}

		array_push($this->_warnings, $warning);
	}

	/**
	 * Resets all warning messages
	 */
	public function resetWarnings()
	{
		$this->_warnings = array();
	}

	/**
	 * Propagates errors and warnings to a foreign object. The foreign object SHOULD
	 * implement the setError() and/or setWarning() methods but DOESN'T HAVE TO be of
	 * AKAbstractObject type. For example, this can even be used to propagate to a
	 * JObject instance in Joomla!. Propagated items will be removed from ourself.
	 * @param object $object The object to propagate errors and warnings to.
	 */
	public function propagateToObject(&$object)
	{
		// Skip non-objects
		if(!is_object($object)) return;

		if( method_exists($object,'setError') )
		{
			if(!empty($this->_errors))
			{
				foreach($this->_errors as $error)
				{
					$object->setError($error);
				}
				$this->_errors = array();
			}
		}

		if( method_exists($object,'setWarning') )
		{
			if(!empty($this->_warnings))
			{
				foreach($this->_warnings as $warning)
				{
					$object->setWarning($warning);
				}
				$this->_warnings = array();
			}
		}
	}

	/**
	 * Propagates errors and warnings from a foreign object. Each propagated list is
	 * then cleared on the foreign object, as long as it implements resetErrors() and/or
	 * resetWarnings() methods.
	 * @param object $object The object to propagate errors and warnings from
	 */
	public function propagateFromObject(&$object)
	{
		if( method_exists($object,'getErrors') )
		{
			$errors = $object->getErrors();
			if(!empty($errors))
			{
				foreach($errors as $error)
				{
					$this->setError($error);
				}
			}
			if(method_exists($object,'resetErrors'))
			{
				$object->resetErrors();
			}
		}

		if( method_exists($object,'getWarnings') )
		{
			$warnings = $object->getWarnings();
			if(!empty($warnings))
			{
				foreach($warnings as $warning)
				{
					$this->setWarning($warning);
				}
			}
			if(method_exists($object,'resetWarnings'))
			{
				$object->resetWarnings();
			}
		}
	}

	/**
	 * Sets the size of the error queue (acts like a LIFO buffer)
	 * @param int $newSize The new queue size. Set to 0 for infinite length.
	 */
	protected function setErrorsQueueSize($newSize = 0)
	{
		$this->_errors_queue_size = (int)$newSize;
	}

	/**
	 * Sets the size of the warnings queue (acts like a LIFO buffer)
	 * @param int $newSize The new queue size. Set to 0 for infinite length.
	 */
	protected function setWarningsQueueSize($newSize = 0)
	{
		$this->_warnings_queue_size = (int)$newSize;
	}

	/**
	 * Returns the last item of a LIFO string message queue, or a specific item
	 * if so specified.
	 * @param array $array An array of strings, holding messages
	 * @param int $i Optional message index
	 * @return mixed The message string, or false if the key doesn't exist
	 */
	private function getItemFromArray($array, $i = null)
	{
		// Find the item
		if ( $i === null) {
			// Default, return the last item
			$item = end($array);
		}
		else
		if ( ! array_key_exists($i, $array) ) {
			// If $i has been specified but does not exist, return false
			return false;
		}
		else
		{
			$item	= $array[$i];
		}

		return $item;
	}

}

/**
 * File post processor engines base class
 */
abstract class AKAbstractPostproc extends AKAbstractObject
{
	/** @var string The current (real) file path we'll have to process */
	protected $filename = null;

	/** @var int The requested permissions */
	protected $perms = 0755;

	/** @var string The temporary file path we gave to the unarchiver engine */
	protected $tempFilename = null;

	/** @var int The UNIX timestamp of the file's desired modification date */
	public $timestamp = 0;

	/**
	 * Processes the current file, e.g. moves it from temp to final location by FTP
	 */
	abstract public function process();

	/**
	 * The unarchiver tells us the path to the filename it wants to extract and we give it
	 * a different path instead.
	 * @param string $filename The path to the real file
	 * @param int $perms The permissions we need the file to have
	 * @return string The path to the temporary file
	 */
	abstract public function processFilename($filename, $perms = 0755);

	/**
	 * Recursively creates a directory if it doesn't exist
	 * @param string $dirName The directory to create
	 * @param int $perms The permissions to give to that directory
	 */
	abstract public function createDirRecursive( $dirName, $perms );

	abstract public function chmod( $file, $perms );

	abstract public function unlink( $file );

	abstract public function rmdir( $directory );

	abstract public function rename( $from, $to );
}

/**
 * The base class of unarchiver classes
 */
abstract class AKAbstractUnarchiver extends AKAbstractPart
{
	/** @var string Archive filename */
	protected $filename = null;

	/** @var array List of the names of all archive parts */
	public $archiveList = array();

	/** @var int The total size of all archive parts */
	public $totalSize = array();

	/** @var integer Current archive part number */
	protected $currentPartNumber = -1;

	/** @var integer The offset inside the current part */
	protected $currentPartOffset = 0;

	/** @var bool Should I restore permissions? */
	protected $flagRestorePermissions = false;

	/** @var AKAbstractPostproc Post processing class */
	protected $postProcEngine = null;

	/** @var string Absolute path to prepend to extracted files */
	protected $addPath = '';

	/** @var array Which files to rename */
	public $renameFiles = array();

	/** @var array Which directories to rename */
	public $renameDirs = array();

	/** @var array Which files to skip */
	public $skipFiles = array();

	/** @var integer Chunk size for processing */
	protected $chunkSize = 524288;

	/** @var resource File pointer to the current archive part file */
	protected $fp = null;

	/** @var int Run state when processing the current archive file */
	protected $runState = null;

	/** @var stdClass File header data, as read by the readFileHeader() method */
	protected $fileHeader = null;

	/** @var int How much of the uncompressed data we've read so far */
	protected $dataReadLength = 0;

	/**
	 * Public constructor
	 */
	public function __construct()
	{
		parent::__construct();
	}

	/**
	 * Wakeup function, called whenever the class is unserialized
	 */
	public function __wakeup()
	{
		if($this->currentPartNumber >= 0)
		{
			$this->fp = @fopen($this->archiveList[$this->currentPartNumber], 'rb');
			if( (is_resource($this->fp)) && ($this->currentPartOffset > 0) )
			{
				@fseek($this->fp, $this->currentPartOffset);
			}
		}
	}

	/**
	 * Sleep function, called whenever the class is serialized
	 */
	public function shutdown()
	{
		if(is_resource($this->fp))
		{
			$this->currentPartOffset = @ftell($this->fp);
			@fclose($this->fp);
		}
	}

	/**
	 * Implements the abstract _prepare() method
	 */
	final protected function _prepare()
	{
		parent::__construct();

		if( count($this->_parametersArray) > 0 )
		{
			foreach($this->_parametersArray as $key => $value)
			{
				switch($key)
				{
					case 'filename': // Archive's absolute filename
						$this->filename = $value;
						break;

					case 'restore_permissions': // Should I restore permissions?
						$this->flagRestorePermissions = $value;
						break;

					case 'post_proc': // Should I use FTP?
						$this->postProcEngine = AKFactory::getpostProc($value);
						break;

					case 'add_path': // Path to prepend
						$this->addPath = $value;
						$this->addPath = str_replace('\\','/',$this->addPath);
						$this->addPath = rtrim($this->addPath,'/');
						if(!empty($this->addPath)) $this->addPath .= '/';
						break;

					case 'rename_files': // Which files to rename (hash array)
						$this->renameFiles = $value;
						break;
					
					case 'rename_dirs': // Which files to rename (hash array)
						$this->renameDirs = $value;
						break;

					case 'skip_files': // Which files to skip (indexed array)
						$this->skipFiles = $value;
						break;
				}
			}
		}

		$this->scanArchives();

		$this->readArchiveHeader();
		$errMessage = $this->getError();
		if(!empty($errMessage))
		{
			$this->setState('error', $errMessage);
		}
		else
		{
			$this->runState = AK_STATE_NOFILE;
			$this->setState('prepared');
		}
	}

	protected function _run()
	{
		if($this->getState() == 'postrun') return;

		$this->setState('running');

		$timer = AKFactory::getTimer();

		$status = true;
		while( $status && ($timer->getTimeLeft() > 0) )
		{
			switch( $this->runState )
			{
				case AK_STATE_NOFILE:
					debugMsg(__CLASS__.'::_run() - Reading file header');
					$status = $this->readFileHeader();
					if($status)
					{
						debugMsg(__CLASS__.'::_run() - Preparing to extract '.$this->fileHeader->realFile);
						// Send start of file notification
						$message = new stdClass;
						$message->type = 'startfile';
						$message->content = new stdClass;
						if( array_key_exists('realfile', get_object_vars($this->fileHeader)) ) {
							$message->content->realfile = $this->fileHeader->realFile;
						} else {
							$message->content->realfile = $this->fileHeader->file;
						}
						$message->content->file = $this->fileHeader->file;
						if( array_key_exists('compressed', get_object_vars($this->fileHeader)) ) {
							$message->content->compressed = $this->fileHeader->compressed;
						} else {
							$message->content->compressed = 0;
						}
						$message->content->uncompressed = $this->fileHeader->uncompressed;
						$this->notify($message);
					} else {
						debugMsg(__CLASS__.'::_run() - Could not read file header');
					}
					break;

				case AK_STATE_HEADER:
				case AK_STATE_DATA:
					debugMsg(__CLASS__.'::_run() - Processing file data');
					$status = $this->processFileData();
					break;

				case AK_STATE_DATAREAD:
				case AK_STATE_POSTPROC:
					debugMsg(__CLASS__.'::_run() - Calling post-processing class');
					$this->postProcEngine->timestamp = $this->fileHeader->timestamp;
					$status = $this->postProcEngine->process();
					$this->propagateFromObject( $…

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