62      * @param string $src
69         string $src  argument
71         return static::doEncode($src, false);
75      * @param string $src
83         string $src,  argument
87         $srcLen = Binary::safeStrlen($src);
91             $chunk = \unpack('C*', Binary::safeSubstr($src, $i, 3));
105             $chunk = \unpack('C*', Binary::safeSubstr($src, $i, $srcLen - $i));
269      * @param int $src
272     protected static function decode6Bits(int $src): int  argument
277         $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);
280         $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70);
283         $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5);
286         $ret += (((0x2a - $src) & ($src - 0x2c)) >> 8) & 63;
289         $ret += (((0x2e - $src) & ($src - 0x30)) >> 8) & 64;
298      * @param int $src
301     protected static function encode6Bits(int $src): string  argument
306         $diff += ((25 - $src) >> 8) & 6;
309         $diff -= ((51 - $src) >> 8) & 75;
312         $diff -= ((61 - $src) >> 8) & 15;
315         $diff += ((62 - $src) >> 8) & 3;
317         return \pack('C', $src + $diff);