43      * @param int $src
47     protected static function decode5Bits(int $src): int  argument
52         $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47);
55         $ret += (((0x60 - $src) & ($src - 0x77)) >> 8) & ($src - 86);
64      * @param int $src
68     protected static function decode5BitsUpper(int $src): int  argument
73         $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47);
76         $ret += (((0x40 - $src) & ($src - 0x57)) >> 8) & ($src - 54);
85      * @param int $src
89     protected static function encode5Bits(int $src): string  argument
91         $src += 0x30;
94         $src += ((0x39 - $src) >> 8) & 39;
96         return pack('C', $src);
105      * @param int $src
109     protected static function encode5BitsUpper(int $src): string  argument
111         $src += 0x30;
114         $src += ((0x39 - $src) >> 8) & 7;
116         return pack('C', $src);