Method lengthOfCode

text-to-qr/lib/phpqrcode/phpqrcode.php:1560–1600

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($mode, $version, $bits)

        
        //----------------------------------------------------------------------
        public static function lengthOfCode($mode, $version, $bits)
        {
            $payload = $bits - 4 - QRspec::lengthIndicator($mode, $version);
            switch($mode) {
                case QR_MODE_NUM:
                    $chunks = (int)($payload / 10);
                    $remain = $payload - $chunks * 10;
                    $size = $chunks * 3;
                    if($remain >= 7) {
                        $size += 2;
                    } else if($remain >= 4) {
                        $size += 1;
                    }
                    break;
                case QR_MODE_AN:
                    $chunks = (int)($payload / 11);
                    $remain = $payload - $chunks * 11;
                    $size = $chunks * 2;
                    if($remain >= 6) 
                        $size++;
                    break;
                case QR_MODE_8:
                    $size = (int)($payload / 8);
                    break;
                case QR_MODE_KANJI:
                    $size = (int)(($payload / 13) * 2);
                    break;
                case QR_MODE_STRUCTURE:
                    $size = (int)($payload / 8);
                    break;
                default:
                    $size = 0;
                    break;
            }
            
            $maxsize = QRspec::maximumWords($mode, $version);
            if($size < 0) $size = 0;
            if($size > $maxsize) $size = $maxsize;

            return $size;
        }
        
        //----------------------------------------------------------------------
        public function createBitStream()