var Base64Json = new Class(
{
    initialize : function()
	{
		this.b64arrays();
	},

	utf8t2d : function(t)
	{
		t = t.replace(/\r\n/g,"\n");

		var d = new Array;
		var test = String.fromCharCode(237);

		if (test.charCodeAt(0) < 0)
		{
			for (var n = 0; n < t.length; n++)
			{
				var c = t.charCodeAt(n);

				if (c > 0)
				{
					d[d.length] = c;
				}
				else
				{
					d[d.length] = (((256 + c) >> 6) | 192);
					d[d.length] = (((256 + c) & 63) | 128);
				}
				
			}
		}
		else
		{
			for (var n = 0; n < t.length; n++)
			{
				var c = t.charCodeAt(n);

				if (c < 128)
				{
					d[d.length] = c;
				}
				else if ((c > 127) && (c < 2048))
				{
					d[d.length] = ((c >> 6) | 192);
					d[d.length] = ((c & 63) | 128);
				}
				else
				{
					d[d.length] = ((c >> 12) | 224);
					d[d.length] = (((c >> 6) & 63) | 128);
					d[d.length] = ((c & 63) | 128);
				}
			}
		}

		return d;
	},
			
	utf8d2t : function(d)
	{
		var r = new Array;
		var i = 0;

		while(i < d.length)
		{
			if (d[i] < 128)
			{
				r[r.length] = String.fromCharCode(d[i]);
				i++;
			}
			else if ((d[i] > 191) && (d[i] < 224))
			{
				r[r.length] = String.fromCharCode(((d[i] & 31) << 6) | (d[i+1] & 63));
				i += 2;
			}
			else
			{
				r[r.length] = String.fromCharCode(((d[i] & 15) << 12) | ((d[i+1] & 63) << 6) | (d[i+2] & 63));
				i+=3;
			}
		}

		return r.join("");
	},

	b64arrays : function()
	{
		var b64s = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

		this.b64 = new Array();
		this.f64 = new Array();

		for (var i = 0; i < b64s.length; i++)
		{
			this.b64[i] = b64s.charAt(i);
			this.f64[b64s.charAt(i)] = i;
		}
	},

	b64d2t : function(d)
	{
		var r = new Array;
		var i = 0;
		var dl = d.length;

		if ((dl % 3) == 1)
		{
			d[d.length] = 0;
			d[d.length] = 0;
		}

		if ((dl % 3) == 2)
		{
			d[d.length] = 0;
		}

		while (i < d.length)
		{
			r[r.length] = this.b64[d[i] >> 2];
			r[r.length] = this.b64[((d[i] & 3) << 4) | (d[i+1] >> 4)];
			r[r.length] = this.b64[((d[i+1] & 15) << 2) | (d[i+2] >> 6)];
			r[r.length] = this.b64[d[i+2] & 63];

			if ((i % 57) == 54)
			{
				r[r.length] = "\n";
			}

			i+=3;
		}

		if ((dl % 3) == 1)
		{
			r[r.length-1] = r[r.length-2] = "=";
		}

		if ((dl%3) == 2)
		{
			r[r.length-1] = "=";
		}

		var t = r.join("");
		return t;
	},

	b64t2d : function(t)
	{
		var d = new Array;
		var i = 0;

		t = t.replace(/\n|\r/g,"");
		t = t.replace(/=/g,"");

		while (i < t.length)
		{
			d[d.length] = (this.f64[t.charAt(i)] << 2) | (this.f64[t.charAt(i+1)] >> 4);
			d[d.length] = (((this.f64[t.charAt(i+1)] & 15) << 4) | (this.f64[t.charAt(i+2)] >> 2));
			d[d.length] = (((this.f64[t.charAt(i+2)] & 3) << 6) | (this.f64[t.charAt(i+3)]));
			i += 4;
		}

		if (t.length % 4 == 2)
		{
			d = d.slice(0, d.length-2);
		}

		if (t.length % 4 == 3)
		{
			d = d.slice(0, d.length-1);
		}

		return d;
	},

    encode : function(obj)
    {
        return this.b64d2t(this.utf8t2d(JSON.encode(obj)));
    },

    decode : function(base64String)
    {
        return JSON.decode(this.utf8d2t(this.b64t2d(base64String)));
    }
});

var base64Json = new Base64Json();