/* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp> & 2006 Ma Bingyao <andot@ujn.edu.cn>
 * Version: 1.1
 * LastModified: Feb 17 2006
 * This library is free.  You can redistribute it and/or modify it.
 */

/*
 * Interfaces:
 * b64 = base64encode(data);
 * data = base64decode(b64);
 */


var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(
    -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);

function base64encode(str) {
    var out, i, len;
    var c1, c2, c3;

    len = str.length;
    i = 0;
    out = [];
    while(i < len) {
	    c1 = str.charCodeAt(i++) & 0xff;
	    if(i == len)
	    {
	        out[out.length] = base64EncodeChars.charAt(c1 >> 2);
    	    out[out.length] = base64EncodeChars.charAt((c1 & 0x3) << 4);
	        out[out.length] = "==";
	        break;
    	}
	    c2 = str.charCodeAt(i++);
    	if(i == len)
	    {
	        out[out.length] = base64EncodeChars.charAt(c1 >> 2);
    	    out[out.length] = base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
	        out[out.length] = base64EncodeChars.charAt((c2 & 0xF) << 2);
	        out[out.length] = "=";
    	    break;
	    }
    	c3 = str.charCodeAt(i++);
	    out[out.length] = base64EncodeChars.charAt(c1 >> 2);
    	out[out.length] = base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
	    out[out.length] = base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
    	out[out.length] = base64EncodeChars.charAt(c3 & 0x3F);
    }
    return out.join('');
}

function base64decode(str) {
    var c1, c2, c3, c4;
    var i, len, out;

    len = str.length;
    i = 0;
    out = [];
    while(i < len) {
	    /* c1 */
    	do {
	        c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    	} while(i < len && c1 == -1);
	    if(c1 == -1) break;

    	/* c2 */
	    do {
	        c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
    	} while(i < len && c2 == -1);
	    if(c2 == -1) break;

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

    	/* c3 */
	    do {
	        c3 = str.charCodeAt(i++) & 0xff;
    	    if(c3 == 61) return out.join('');
	        c3 = base64DecodeChars[c3];
    	} while(i < len && c3 == -1);
	    if(c3 == -1) break;

    	out[out.length] = String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

    	/* c4 */
	    do {
	        c4 = str.charCodeAt(i++) & 0xff;
    	    if(c4 == 61) return out.join('');
    	    c4 = base64DecodeChars[c4];
	    } while(i < len && c4 == -1);
    	if(c4 == -1) break;
	    out[out.length] = String.fromCharCode(((c3 & 0x03) << 6) | c4);
    }
    return out.join('');
}