92      * @param string $src
100         string $src  argument
110                     return sodium_bin2base64($src, $variant);
116         return static::doEncode($src, false);
120      * @param string $src
128         string $src,  argument
132         $srcLen = strlen($src);
136             $chunk = unpack('C*', substr($src, $i, 3));
150             $chunk = unpack('C*', substr($src, $i, $srcLen - $i));
331      * @param int $src
334     protected static function decode6Bits(int $src): int  argument
339         $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);
342         $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70);
345         $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5);
348         $ret += (((0x2a - $src) & ($src - 0x2c)) >> 8) & 63;
351         $ret += (((0x2e - $src) & ($src - 0x30)) >> 8) & 64;
360      * @param int $src
363     protected static function encode6Bits(int $src): string  argument
368         $diff += ((25 - $src) >> 8) & 6;
371         $diff -= ((51 - $src) >> 8) & 75;
374         $diff -= ((61 - $src) >> 8) & 15;
377         $diff += ((62 - $src) >> 8) & 3;
379         return pack('C', $src + $diff);