Method appendPaddingBit

text-to-qr/lib/phpqrcode/phpqrcode.php:1648–1690

----------------------------------------------------------------------

(&$bstream)

        
        //----------------------------------------------------------------------
        public function appendPaddingBit(&$bstream)
        {
            $bits = $bstream->size();
            $maxwords = QRspec::getDataLength($this->version, $this->level);
            $maxbits = $maxwords * 8;

            if ($maxbits == $bits) {
                return 0;
            }

            if ($maxbits - $bits < 5) {
                return $bstream->appendNum($maxbits - $bits, 0);
            }

            $bits += 4;
            $words = (int)(($bits + 7) / 8);

            $padding = new QRbitstream();
            $ret = $padding->appendNum($words * 8 - $bits + 4, 0);
            
            if($ret < 0) 
                return $ret;

            $padlen = $maxwords - $words;
            
            if($padlen > 0) {
                
                $padbuf = array();
                for($i=0; $i<$padlen; $i++) {
                    $padbuf[$i] = ($i&1)?0x11:0xec;
                }
                
                $ret = $padding->appendBytes($padlen, $padbuf);
                
                if($ret < 0)
                    return $ret;
                
            }

            $ret = $bstream->append($padding);
            
            return $ret;
        }

        //----------------------------------------------------------------------
        public function mergeBitStream()