public static String encode(byte[] in)
	{
		int iLen = in.length;
		int oDataLen = (iLen * 4 + 2) / 3; // output length without padding
		int oLen = (iLen + 2) / 3 * 4; // output length including padding
		char[] out = new char[oLen];
		int ip = 0;
		int op = 0;

		while (ip < iLen)
		{
			int i0 = in[ip++] & 0xff;
			int i1 = ip < iLen ? in[ip++] & 0xff : 0;
			int i2 = ip < iLen ? in[ip++] & 0xff : 0;
			int o0 = i0 >>> 2;
			int o1 = (i0 & 3) << 4 | i1 >>> 4;
			int o2 = (i1 & 0xf) << 2 | i2 >>> 6;
			int o3 = i2 & 0x3F;
			out[op++] = MAP_TO_BASE64[o0];
			out[op++] = MAP_TO_BASE64[o1];
			out[op] = op < oDataLen ? MAP_TO_BASE64[o2] : '=';
			op++;
			out[op] = op < oDataLen ? MAP_TO_BASE64[o3] : '=';
			op++;
		}
		return new String(out);
	}