aepnat / simpuskesmas

config/qrcode/qrmask.php

<?php
/*
 * PHP QR Code encoder
 *
 * Masking
 *
 * Based on libqrencode C library distributed under LGPL 2.1
 * Copyright (C) 2006, 2007, 2008, 2009 Kentaro Fukuchi <fukuchi@megaui.net>
 *
 * PHP QR Code is distributed under LGPL 3
 * Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

    define('N1', 3);
    define('N2', 3);
    define('N3', 40);
    define('N4', 10);

    class qrmask
    {
        public $runLength = [];

        //----------------------------------------------------------------------
        public function __construct()
        {
            $this->runLength = array_fill(0, QRSPEC_WIDTH_MAX + 1, 0);
        }

        //----------------------------------------------------------------------
        public function writeFormatInformation($width, &$frame, $mask, $level)
        {
            $blacks = 0;
            $format = QRspec::getFormatInfo($mask, $level);

            for ($i = 0; $i < 8; $i++) {
                if ($format & 1) {
                    $blacks += 2;
                    $v = 0x85;
                } else {
                    $v = 0x84;
                }

                $frame[8][$width - 1 - $i] = chr($v);
                if ($i < 6) {
                    $frame[$i][8] = chr($v);
                } else {
                    $frame[$i + 1][8] = chr($v);
                }
                $format = $format >> 1;
            }

            for ($i = 0; $i < 7; $i++) {
                if ($format & 1) {
                    $blacks += 2;
                    $v = 0x85;
                } else {
                    $v = 0x84;
                }

                $frame[$width - 7 + $i][8] = chr($v);
                if ($i == 0) {
                    $frame[8][7] = chr($v);
                } else {
                    $frame[8][6 - $i] = chr($v);
                }

                $format = $format >> 1;
            }

            return $blacks;
        }

        //----------------------------------------------------------------------
        public function mask0($x, $y)
        {
            return ($x + $y) & 1;
        }

        public function mask1($x, $y)
        {
            return $y & 1;
        }

        public function mask2($x, $y)
        {
            return $x % 3;
        }

        public function mask3($x, $y)
        {
            return ($x + $y) % 3;
        }

        public function mask4($x, $y)
        {
            return (((int) ($y / 2)) + ((int) ($x / 3))) & 1;
        }

        public function mask5($x, $y)
        {
            return (($x * $y) & 1) + ($x * $y) % 3;
        }

        public function mask6($x, $y)
        {
            return ((($x * $y) & 1) + ($x * $y) % 3) & 1;
        }

        public function mask7($x, $y)
        {
            return ((($x * $y) % 3) + (($x + $y) & 1)) & 1;
        }

        //----------------------------------------------------------------------
        private function generateMaskNo($maskNo, $width, $frame)
        {
            $bitMask = array_fill(0, $width, array_fill(0, $width, 0));

            for ($y = 0; $y < $width; $y++) {
                for ($x = 0; $x < $width; $x++) {
                    if (ord($frame[$y][$x]) & 0x80) {
                        $bitMask[$y][$x] = 0;
                    } else {
                        $maskFunc = call_user_func([$this, 'mask'.$maskNo], $x, $y);
                        $bitMask[$y][$x] = ($maskFunc == 0) ? 1 : 0;
                    }
                }
            }

            return $bitMask;
        }

        //----------------------------------------------------------------------
        public static function serial($bitFrame)
        {
            $codeArr = [];

            foreach ($bitFrame as $line) {
                $codeArr[] = implode('', $line);
            }

            return gzcompress(implode("\n", $codeArr), 9);
        }

        //----------------------------------------------------------------------
        public static function unserial($code)
        {
            $codeArr = [];

            $codeLines = explode("\n", gzuncompress($code));
            foreach ($codeLines as $line) {
                $codeArr[] = str_split($line);
            }

            return $codeArr;
        }

        //----------------------------------------------------------------------
        public function makeMaskNo($maskNo, $width, $s, &$d, $maskGenOnly = false)
        {
            $b = 0;
            $bitMask = [];

            $fileName = QR_CACHE_DIR.'mask_'.$maskNo.DIRECTORY_SEPARATOR.'mask_'.$width.'_'.$maskNo.'.dat';

            if (QR_CACHEABLE) {
                if (file_exists($fileName)) {
                    $bitMask = self::unserial(file_get_contents($fileName));
                } else {
                    $bitMask = $this->generateMaskNo($maskNo, $width, $s);
                    if (!file_exists(QR_CACHE_DIR.'mask_'.$maskNo)) {
                        mkdir(QR_CACHE_DIR.'mask_'.$maskNo);
                    }
                    file_put_contents($fileName, self::serial($bitMask));
                }
            } else {
                $bitMask = $this->generateMaskNo($maskNo, $width, $s);
            }

            if ($maskGenOnly) {
                return;
            }

            $d = $s;

            for ($y = 0; $y < $width; $y++) {
                for ($x = 0; $x < $width; $x++) {
                    if ($bitMask[$y][$x] == 1) {
                        $d[$y][$x] = chr(ord($s[$y][$x]) ^ (int) $bitMask[$y][$x]);
                    }
                    $b += (int) (ord($d[$y][$x]) & 1);
                }
            }

            return $b;
        }

        //----------------------------------------------------------------------
        public function makeMask($width, $frame, $maskNo, $level)
        {
            $masked = array_fill(0, $width, str_repeat("\0", $width));
            $this->makeMaskNo($maskNo, $width, $frame, $masked);
            $this->writeFormatInformation($width, $masked, $maskNo, $level);

            return $masked;
        }

        //----------------------------------------------------------------------
        public function calcN1N3($length)
        {
            $demerit = 0;

            for ($i = 0; $i < $length; $i++) {
                if ($this->runLength[$i] >= 5) {
                    $demerit += (N1 + ($this->runLength[$i] - 5));
                }
                if ($i & 1) {
                    if (($i >= 3) && ($i < ($length - 2)) && ($this->runLength[$i] % 3 == 0)) {
                        $fact = (int) ($this->runLength[$i] / 3);
                        if (($this->runLength[$i - 2] == $fact) &&
                           ($this->runLength[$i - 1] == $fact) &&
                           ($this->runLength[$i + 1] == $fact) &&
                           ($this->runLength[$i + 2] == $fact)) {
                            if (($this->runLength[$i - 3] < 0) || ($this->runLength[$i - 3] >= (4 * $fact))) {
                                $demerit += N3;
                            } elseif ((($i + 3) >= $length) || ($this->runLength[$i + 3] >= (4 * $fact))) {
                                $demerit += N3;
                            }
                        }
                    }
                }
            }

            return $demerit;
        }

        //----------------------------------------------------------------------
        public function evaluateSymbol($width, $frame)
        {
            $head = 0;
            $demerit = 0;

            for ($y = 0; $y < $width; $y++) {
                $head = 0;
                $this->runLength[0] = 1;

                $frameY = $frame[$y];

                if ($y > 0) {
                    $frameYM = $frame[$y - 1];
                }

                for ($x = 0; $x < $width; $x++) {
                    if (($x > 0) && ($y > 0)) {
                        $b22 = ord($frameY[$x]) & ord($frameY[$x - 1]) & ord($frameYM[$x]) & ord($frameYM[$x - 1]);

The variable $frameYM does not seem to be defined for all execution paths leading up to this point.

                        $w22 = ord($frameY[$x]) | ord($frameY[$x - 1]) | ord($frameYM[$x]) | ord($frameYM[$x - 1]);

                        if (($b22 | ($w22 ^ 1)) & 1) {
                            $demerit += N2;
                        }
                    }
                    if (($x == 0) && (ord($frameY[$x]) & 1)) {
                        $this->runLength[0] = -1;
                        $head = 1;
                        $this->runLength[$head] = 1;
                    } elseif ($x > 0) {
                        if ((ord($frameY[$x]) ^ ord($frameY[$x - 1])) & 1) {
                            $head++;
                            $this->runLength[$head] = 1;
                        } else {
                            $this->runLength[$head]++;
                        }
                    }
                }

                $demerit += $this->calcN1N3($head + 1);
            }

            for ($x = 0; $x < $width; $x++) {
                $head = 0;
                $this->runLength[0] = 1;

                for ($y = 0; $y < $width; $y++) {
                    if ($y == 0 && (ord($frame[$y][$x]) & 1)) {
                        $this->runLength[0] = -1;
                        $head = 1;
                        $this->runLength[$head] = 1;
                    } elseif ($y > 0) {
                        if ((ord($frame[$y][$x]) ^ ord($frame[$y - 1][$x])) & 1) {
                            $head++;
                            $this->runLength[$head] = 1;
                        } else {
                            $this->runLength[$head]++;
                        }
                    }
                }

                $demerit += $this->calcN1N3($head + 1);
            }

            return $demerit;
        }

        //----------------------------------------------------------------------
        public function mask($width, $frame, $level)
        {
            $minDemerit = PHP_INT_MAX;
            $bestMaskNum = 0;

The assignment to $bestMaskNum is dead and can be removed.

            $bestMask = [];

The assignment to $bestMask is dead and can be removed.

            $checked_masks = [0, 1, 2, 3, 4, 5, 6, 7];

            if (QR_FIND_FROM_RANDOM !== false) {

The condition QR_FIND_FROM_RANDOM !== false is always false.

                $howManuOut = 8 - (QR_FIND_FROM_RANDOM % 9);
                for ($i = 0; $i < $howManuOut; $i++) {
                    $remPos = rand(0, count($checked_masks) - 1);
                    unset($checked_masks[$remPos]);
                    $checked_masks = array_values($checked_masks);
                }
            }

            $bestMask = $frame;

            foreach ($checked_masks as $i) {
                $mask = array_fill(0, $width, str_repeat("\0", $width));

                $demerit = 0;

The assignment to $demerit is dead and can be removed.

                $blacks = 0;

The assignment to $blacks is dead and can be removed.

                $blacks = $this->makeMaskNo($i, $width, $frame, $mask);
                $blacks += $this->writeFormatInformation($width, $mask, $i, $level);
                $blacks = (int) (100 * $blacks / ($width * $width));
                $demerit = (int) ((int) (abs($blacks - 50) / 5) * N4);
                $demerit += $this->evaluateSymbol($width, $mask);

                if ($demerit < $minDemerit) {
                    $minDemerit = $demerit;
                    $bestMask = $mask;
                    $bestMaskNum = $i;
                }
            }

            return $bestMask;
        }

        //----------------------------------------------------------------------
    }