/**
* o------------------------------------------------------------------------------o
* | This package is licensed under the Phpguru license 2008. A quick summary is  |
* | that the code is free to use for non-commercial purposes. For commercial     |
* | purposes of any kind there is a small license fee to pay. You can read more  |
* | at:                                                                          |
* |                  http://www.phpguru.org/static/license.html                  |
* o------------------------------------------------------------------------------o
*
* © Copyright 2008 Richard Heyes
*/

/**
* Unserializes a PHP serialized data type. Currently handles:
*  o Strings
*  o Integers
*  o Doubles
*  o Arrays
*  o Booleans
*  o NULL
*  o Objects
* 
* alert()s will be thrown if the function is passed something it
* can't handle or incorrect data.
*
* @param  string input The serialized PHP data
* @return mixed        The resulting datatype
*/
function PHP_Unserialize(input)
{
    var result = PHP_Unserialize_(input);
    return result[0];
}


/**
* Function which performs the actual unserializing
*
* @param string input Input to parse
*/
function PHP_Unserialize_(input)
{
    var length = 0;

    switch (input.charAt(0)) {
        /**
        * Array
        */
        case 'a':
            length = PHP_Unserialize_GetLength(input);
            input  = input.substr(String(length).length + 4);

            var arr   = new Array();
            var key   = null;
            var value = null;

            for (var i=0; i<length; ++i) {
                key   = PHP_Unserialize_(input);
                input = key[1];

                value = PHP_Unserialize_(input);
                input = value[1];

                arr[key[0]] = value[0];
            }

            input = input.substr(1);
            return [arr, input];
            break;
        
        /**
        * Objects
        */
        case 'O':
            length = PHP_Unserialize_GetLength(input);
            var classname = String(input.substr(String(length).length + 4, length));
            
            input  = input.substr(String(length).length + 6 + length);
            var numProperties = Number(input.substring(0, input.indexOf(':')))
            input = input.substr(String(numProperties).length + 2);

            var obj      = new Object();
            var property = null;
            var value    = null;

            for (var i=0; i<numProperties; ++i) {
                key   = PHP_Unserialize_(input);
                input = key[1];
                
                // Handle private/protected
                key[0] = key[0].replace(new RegExp('^\x00' + classname + '\x00'), '');
                key[0] = key[0].replace(new RegExp('^\x00\\*\x00'), '');

                value = PHP_Unserialize_(input);
                input = value[1];

                obj[key[0]] = value[0];
            }

            input = input.substr(1);
            return [obj, input];
            break;

        /**
        * Strings
        */
        case 's':
            length = PHP_Unserialize_GetLength(input);
            return [String(input.substr(String(length).length + 4, length)), input.substr(String(length).length + 6 + length)];
            break;

        /**
        * Integers and doubles
        */
        case 'i':
        case 'd':
            var num = Number(input.substring(2, input.indexOf(';')));
            return [num, input.substr(String(num).length + 3)];
            break;
        
        /**
        * Booleans
        */
        case 'b':
            var bool = (input.substr(2, 1) == 1);
            return [bool, input.substr(4)];
            break;
        
        /**
        * Null
        */
        case 'N':
            return [null, input.substr(2)];
            break;

        /**
        * Unsupported
        */
        case 'o':
        case 'r':
        case 'C':
        case 'R':
        case ':':
        case 'U':
            alert('Error: Unsupported PHP data type found!');

        /**
        * Error
        */
        default:
            return [null, null];
            break;
    }
}


/**
* Returns length of strings/arrays etc
*
* @param string input Input to parse
*/
function PHP_Unserialize_GetLength(input)
{
    input = input.substring(2);
    var length = Number(input.substr(0, input.indexOf(':')));

    if( input.indexOf('é') > 0 && input.indexOf('é') <= length )
    {
    	length = length - 1;
    }
    
    if( input.indexOf('è') > 0 && input.indexOf('è') <= length )
    {
    	length = length - 1;
    }

    return length;
}