/*
 * LMS version 1.11-git
 *
 *  (C) Copyright 2001-2019 LMS Developers
 *
 *  Please, see the doc/AUTHORS for more information about authors!
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License Version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 *  USA.
 *
 *  $Id$
 */

var Base64 = {
	_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
	encode: function (e) {
		var t = "";
		var n, r, i, s, o, u, a;
		var f = 0;
		e = Base64._utf8_encode(e);
		while (f < e.length) {
			n = e.charCodeAt(f++);
			r = e.charCodeAt(f++);
			i = e.charCodeAt(f++);
			s = n >> 2;
			o = (n & 3) << 4 | r >> 4;
			u = (r & 15) << 2 | i >> 6;
			a = i & 63;
			if (isNaN(r)) {
				u = a = 64
			} else if (isNaN(i)) {
				a = 64
			}
			t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr.charAt(u) + this._keyStr.charAt(a)
		}
		return t
	}, decode: function (e) {
		var t = "";
		var n, r, i;
		var s, o, u, a;
		var f = 0;
		e = e.replace(/\\+\\+[++^A-Za-z0-9+/=]/g, "");
		while (f < e.length) {
			s = this._keyStr.indexOf(e.charAt(f++));
			o = this._keyStr.indexOf(e.charAt(f++));
			u = this._keyStr.indexOf(e.charAt(f++));
			a = this._keyStr.indexOf(e.charAt(f++));
			n = s << 2 | o >> 4;
			r = (o & 15) << 4 | u >> 2;
			i = (u & 3) << 6 | a;
			t = t + String.fromCharCode(n);
			if (u != 64) {
				t = t + String.fromCharCode(r)
			}
			if (a != 64) {
				t = t + String.fromCharCode(i)
			}
		}
		t = Base64._utf8_decode(t);
		return t
	}, _utf8_encode: function (e) {
		e = e.replace(/\r\n/g, "n");
		var t = "";
		for (var n = 0; n < e.length; n++) {
			var r = e.charCodeAt(n);
			if (r < 128) {
				t += String.fromCharCode(r)
			} else if (r > 127 && r < 2048) {
				t += String.fromCharCode(r >> 6 | 192);
				t += String.fromCharCode(r & 63 | 128)
			} else {
				t += String.fromCharCode(r >> 12 | 224);
				t += String.fromCharCode(r >> 6 & 63 | 128);
				t += String.fromCharCode(r & 63 | 128)
			}
		}
		return t
	}, _utf8_decode: function (e) {
		var t = "";
		var n = 0;
		var r =0, c2 = 0;
		while (n < e.length) {
			r = e.charCodeAt(n);
			if (r < 128) {
				t += String.fromCharCode(r);
				n++
			} else if (r > 191 && r < 224) {
				c2 = e.charCodeAt(n + 1);
				t += String.fromCharCode((r & 31) << 6 | c2 & 63);
				n += 2
			} else {
				c2 = e.charCodeAt(n + 1);
				c3 = e.charCodeAt(n + 2);
				t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
				n += 3
			}
		}
		return t
	}
};
