import "util/base64";
static function encode(buf: Byte[]): String
static function encode(s: String, buf: Byte[]): String
static function encode(buf: Byte[], off: Integer, len: Integer): String
static function encode(s: String, buf: Byte[], off: Integer, len: Integer): String
static function decode(s: String): Byte[]
static function decode(out: Byte[], s: String): Byte[]
static function decode(s: String, off: Integer, len: Integer): Byte[]
static function decode(out: Byte[], s: String, off: Integer, len: Integer): Byte[]