vendor/phpqrcode/qrrscode.php

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<?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