审查视图

vendor/phpqrcode/qrrscode.php 8.1 KB
王智 authored
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210
<?php
/*
 * PHP QR Code encoder
 *
 * Reed-Solomon error correction support
 * 
 * Copyright (C) 2002, 2003, 2004, 2006 Phil Karn, KA9Q
 * (libfec is released under the GNU Lesser General Public License.)
 *
 * 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
 */
 
    class QRrsItem {
    
        public $mm;                  // Bits per symbol 
        public $nn;                  // Symbols per block (= (1<<mm)-1) 
        public $alpha_to = array();  // log lookup table 
        public $index_of = array();  // Antilog lookup table 
        public $genpoly = array();   // Generator polynomial 
        public $nroots;              // Number of generator roots = number of parity symbols 
        public $fcr;                 // First consecutive root, index form 
        public $prim;                // Primitive element, index form 
        public $iprim;               // prim-th root of 1, index form 
        public $pad;                 // Padding bytes in shortened block 
        public $gfpoly;
    
        //----------------------------------------------------------------------
        public function modnn($x)
        {
            while ($x >= $this->nn) {
                $x -= $this->nn;
                $x = ($x >> $this->mm) + ($x & $this->nn);
            }
            
            return $x;
        }
        
        //----------------------------------------------------------------------
        public static function init_rs_char($symsize, $gfpoly, $fcr, $prim, $nroots, $pad)
        {
            // Common code for intializing a Reed-Solomon control block (char or int symbols)
            // Copyright 2004 Phil Karn, KA9Q
            // May be used under the terms of the GNU Lesser General Public License (LGPL)

            $rs = null;
            
            // Check parameter ranges
            if($symsize < 0 || $symsize > 8)                     return $rs;
            if($fcr < 0 || $fcr >= (1<<$symsize))                return $rs;
            if($prim <= 0 || $prim >= (1<<$symsize))             return $rs;
            if($nroots < 0 || $nroots >= (1<<$symsize))          return $rs; // Can't have more roots than symbol values!
            if($pad < 0 || $pad >= ((1<<$symsize) -1 - $nroots)) return $rs; // Too much padding

            $rs = new QRrsItem();
            $rs->mm = $symsize;
            $rs->nn = (1<<$symsize)-1;
            $rs->pad = $pad;

            $rs->alpha_to = array_fill(0, $rs->nn+1, 0);
            $rs->index_of = array_fill(0, $rs->nn+1, 0);
          
            // PHP style macro replacement ;)
            $NN =& $rs->nn;
            $A0 =& $NN;
            
            // Generate Galois field lookup tables
            $rs->index_of[0] = $A0; // log(zero) = -inf
            $rs->alpha_to[$A0] = 0; // alpha**-inf = 0
            $sr = 1;
          
            for($i=0; $i<$rs->nn; $i++) {
                $rs->index_of[$sr] = $i;
                $rs->alpha_to[$i] = $sr;
                $sr <<= 1;
                if($sr & (1<<$symsize)) {
                    $sr ^= $gfpoly;
                }
                $sr &= $rs->nn;
            }
            
            if($sr != 1){
                // field generator polynomial is not primitive!
                $rs = NULL;
                return $rs;
            }

            /* Form RS code generator polynomial from its roots */
            $rs->genpoly = array_fill(0, $nroots+1, 0);
        
            $rs->fcr = $fcr;
            $rs->prim = $prim;
            $rs->nroots = $nroots;
            $rs->gfpoly = $gfpoly;

            /* Find prim-th root of 1, used in decoding */
            for($iprim=1;($iprim % $prim) != 0;$iprim += $rs->nn)
            ; // intentional empty-body loop!
            
            $rs->iprim = (int)($iprim / $prim);
            $rs->genpoly[0] = 1;
            
            for ($i = 0,$root=$fcr*$prim; $i < $nroots; $i++, $root += $prim) {
                $rs->genpoly[$i+1] = 1;

                // Multiply rs->genpoly[] by  @**(root + x)
                for ($j = $i; $j > 0; $j--) {
                    if ($rs->genpoly[$j] != 0) {
                        $rs->genpoly[$j] = $rs->genpoly[$j-1] ^ $rs->alpha_to[$rs->modnn($rs->index_of[$rs->genpoly[$j]] + $root)];
                    } else {
                        $rs->genpoly[$j] = $rs->genpoly[$j-1];
                    }
                }
                // rs->genpoly[0] can never be zero
                $rs->genpoly[0] = $rs->alpha_to[$rs->modnn($rs->index_of[$rs->genpoly[0]] + $root)];
            }
            
            // convert rs->genpoly[] to index form for quicker encoding
            for ($i = 0; $i <= $nroots; $i++)
                $rs->genpoly[$i] = $rs->index_of[$rs->genpoly[$i]];

            return $rs;
        }
        
        //----------------------------------------------------------------------
        public function encode_rs_char($data, &$parity)
        {
            $MM       =& $this->mm;
            $NN       =& $this->nn;
            $ALPHA_TO =& $this->alpha_to;
            $INDEX_OF =& $this->index_of;
            $GENPOLY  =& $this->genpoly;
            $NROOTS   =& $this->nroots;
            $FCR      =& $this->fcr;
            $PRIM     =& $this->prim;
            $IPRIM    =& $this->iprim;
            $PAD      =& $this->pad;
            $A0       =& $NN;

            $parity = array_fill(0, $NROOTS, 0);

            for($i=0; $i< ($NN-$NROOTS-$PAD); $i++) {
                
                $feedback = $INDEX_OF[$data[$i] ^ $parity[0]];
                if($feedback != $A0) {      
                    // feedback term is non-zero
            
                    // This line is unnecessary when GENPOLY[NROOTS] is unity, as it must
                    // always be for the polynomials constructed by init_rs()
                    $feedback = $this->modnn($NN - $GENPOLY[$NROOTS] + $feedback);
            
                    for($j=1;$j<$NROOTS;$j++) {
                        $parity[$j] ^= $ALPHA_TO[$this->modnn($feedback + $GENPOLY[$NROOTS-$j])];
                    }
                }
                
                // Shift 
                array_shift($parity);
                if($feedback != $A0) {
                    array_push($parity, $ALPHA_TO[$this->modnn($feedback + $GENPOLY[0])]);
                } else {
                    array_push($parity, 0);
                }
            }
        }
    }
    
    //##########################################################################
    
    class QRrs {
    
        public static $items = array();
        
        //----------------------------------------------------------------------
        public static function init_rs($symsize, $gfpoly, $fcr, $prim, $nroots, $pad)
        {
            foreach(self::$items as $rs) {
                if($rs->pad != $pad)       continue;
                if($rs->nroots != $nroots) continue;
                if($rs->mm != $symsize)    continue;
                if($rs->gfpoly != $gfpoly) continue;
                if($rs->fcr != $fcr)       continue;
                if($rs->prim != $prim)     continue;

                return $rs;
            }

            $rs = QRrsItem::init_rs_char($symsize, $gfpoly, $fcr, $prim, $nroots, $pad);
            array_unshift(self::$items, $rs);

            return $rs;
        }
    }