/**********************************************************\
|                                                          |
| The implementation of PHPRPC Protocol 3.0                |
|                                                          |
| base64.js                                                |
|                                                          |
| Release 3.0.0                                            |
| Copyright (c) 2005-2008 by Team-PHPRPC                   |
|                                                          |
| WebSite:  http://www.phprpc.org/                         |
|           http://www.phprpc.net/                         |
|           http://www.phprpc.com/                         |
|           http://sourceforge.net/projects/php-rpc/       |
|                                                          |
| Authors:  Ma Bingyao <andot@ujn.edu.cn>                  |
|                                                          |
| This file may be distributed and/or modified under the   |
| terms of the GNU Lesser General Public License (LGPL)    |
| version 3.0 as published by the Free Software Foundation |
| and appearing in the included file LICENSE.              |
|                                                          |
\**********************************************************/

/* Base64 library.
 *
 * Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>
 *               2005-2008 Ma Bingyao <andot@ujn.edu.cn>
 * Version: 1.28
 * LastModified: Mar 3, 2008
 * This library is free.  You can redistribute it and/or modify it.
 */

/*
 * Interfaces:
 * b64 = window.btoa(data);
 * data = window.atob(b64);
 */

if (typeof(btoa) == "undefined") {
    btoa = function() {
        var base64EncodeChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'.split('');
        return function(str) {
            var out, i, j, len, r, l, c;
            i = j = 0;
            len = str.length;
            r = len % 3;
            len = len - r;
            l = (len / 3) << 2;
            if (r > 0) {
                l += 4;
            }
            out = new Array(l);

            while (i < len) {
                c = str.charCodeAt(i++) << 16 |
                    str.charCodeAt(i++) << 8  |
                    str.charCodeAt(i++);
                out[j++] = base64EncodeChars[c >> 18]
                    + base64EncodeChars[c >> 12 & 0x3f]
                    + base64EncodeChars[c >> 6  & 0x3f]
                    + base64EncodeChars[c & 0x3f] ;
            }
            if (r == 1) {
                c = str.charCodeAt(i++);
                out[j++] = base64EncodeChars[c >> 2]
                    + base64EncodeChars[(c & 0x03) << 4]
                    + "==";
                }
            else if (r == 2) {
                c = str.charCodeAt(i++) << 8 |
                    str.charCodeAt(i++);
                out[j++] = base64EncodeChars[c >> 10]
                     + base64EncodeChars[c >> 4 & 0x3f]
                     + base64EncodeChars[(c & 0x0f) << 2]
                     + "=";
            }
            return out.join('');
        }
    }();
}

if (typeof(atob) == "undefined") {
    atob = function() {
        var base64DecodeChars = [
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
            52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
            -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
            15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
            -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
            41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
        ];
        return function(str) {
            var c1, c2, c3, c4;
            var i, j, len, r, l, out;

            len = str.length;
            if (len % 4 != 0) {
                return '';
            }
            if (/[^ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\+\/\=]/.test(str)) {
                return '';
            }
            if (str.charAt(len - 2) == '=') {
                r = 1;
            }
            else if (str.charAt(len - 1) == '=') {
                r = 2;
            }
            else {
                r = 0;
            }
            l = len;
            if (r > 0) {
                l -= 4;
            }
            l = (l >> 2) * 3 + r;
            out = new Array(l);

            i = j = 0;
            while (i < len) {
                // c1
                c1 = base64DecodeChars[str.charCodeAt(i++)];
                if (c1 == -1) break;

                // c2
                c2 = base64DecodeChars[str.charCodeAt(i++)];
                if (c2 == -1) break;

                out[j++] = String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

                // c3
                c3 = base64DecodeChars[str.charCodeAt(i++)];
                if (c3 == -1) break;

                out[j++] = String.fromCharCode(((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2));

                // c4
                c4 = base64DecodeChars[str.charCodeAt(i++)];
                if (c4 == -1) break;

                out[j++] = String.fromCharCode(((c3 & 0x03) << 6) | c4);
            }
            return out.join('');
        }
    }();
}