<?php
//============================================================+
// File name   : qrcode.php
// Begin       : 2010-03-22
// Last Update : 2010-03-29
// Version     : 1.0.002
// License     : GNU LGPL v.3 (http://www.gnu.org/copyleft/lesser.html)
// 	----------------------------------------------------------------------------
//
// 	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
//  or browse http://www.gnu.org/copyleft/lesser.html
//
//  ----------------------------------------------------------------------------
//
// DESCRIPTION :
//
// Class to create QR-code arrays for TCPDF class.
// QR Code symbol is a 2D barcode that can be scanned by
// handy terminals such as a mobile phone with CCD.
// The capacity of QR Code is up to 7000 digits or 4000
// characters, and has high robustness.
// This class supports QR Code model 2, described in
// JIS (Japanese Industrial Standards) X0510:2004
// or ISO/IEC 18004.
// Currently the following features are not supported:
// ECI and FNC1 mode, Micro QR Code, QR Code model 1,
// Structured mode.
//
// This class is derived from the following projects:
// ---------------------------------------------------------
// "PHP QR Code encoder"
// License: GNU-LGPLv3
// Copyright (C) 2010 by Dominik Dzienia <deltalab at poczta dot fm>
// http://phpqrcode.sourceforge.net/
// https://sourceforge.net/projects/phpqrcode/
//
// The "PHP QR Code encoder" is based on
// "C libqrencode library" (ver. 3.1.1)
// License: GNU-LGPL 2.1
// Copyright (C) 2006-2010 by Kentaro Fukuchi
// http://megaui.net/fukuchi/works/qrencode/index.en.html
//
// Reed-Solomon code encoder is written by Phil Karn, KA9Q.
// Copyright (C) 2002-2006 Phil Karn, KA9Q
//
// QR Code is registered trademark of DENSO WAVE INCORPORATED
// http://www.denso-wave.com/qrcode/index-e.html
// ---------------------------------------------------------
//
// Author: Nicola Asuni
//
// (c) Copyright 2010:
//               Nicola Asuni
//               Tecnick.com S.r.l.
//               Via della Pace, 11
//               09044 Quartucciu (CA)
//               ITALY
//               www.tecnick.com
//               info@tecnick.com
//============================================================+

/**
 * Class to create QR-code arrays for TCPDF class.
 * QR Code symbol is a 2D barcode that can be scanned by handy terminals such as a mobile phone with CCD.
 * The capacity of QR Code is up to 7000 digits or 4000 characters, and has high robustness.
 * This class supports QR Code model 2, described in JIS (Japanese Industrial Standards) X0510:2004 or ISO/IEC 18004.
 * Currently the following features are not supported: ECI and FNC1 mode, Micro QR Code, QR Code model 1, Structured mode.
 *
 * This class is derived from "PHP QR Code encoder" by Dominik Dzienia (http://phpqrcode.sourceforge.net/) based on "libqrencode C library 3.1.1." by Kentaro Fukuchi (http://megaui.net/fukuchi/works/qrencode/index.en.html), contains Reed-Solomon code written by Phil Karn, KA9Q. QR Code is registered trademark of DENSO WAVE INCORPORATED (http://www.denso-wave.com/qrcode/index-e.html).
 * Please read comments on this class source file for full copyright and license information.
 *
 * @package   com.tecnick.tcpdf
 * @abstract  Class for generating QR-code array for TCPDF.
 * @author    Nicola Asuni
 * @copyright 2010 Nicola Asuni - Tecnick.com S.r.l (www.tecnick.com) Via Della Pace, 11 - 09044 - Quartucciu (CA) - ITALY - www.tecnick.com - info@tecnick.com
 * @link      http://www.tcpdf.org
 * @license   http://www.gnu.org/copyleft/lesser.html LGPL
 * @version   1.0.002
 */

// definitions
if (!defined('QRCODEDEFS')) {
    /**
     * Indicate that definitions for this class are set
     */
    define('QRCODEDEFS', true);
    // -----------------------------------------------------
    // Encoding modes (characters which can be encoded in QRcode)
    /**
     * Encoding mode
     */
    define('QR_MODE_NL', -1);
    /**
     * Encoding mode numeric (0-9). 3 characters are encoded to 10bit length. In theory, 7089 characters or less can be stored in a QRcode.
     */
    define('QR_MODE_NM', 0);
    /**
     * Encoding mode alphanumeric (0-9A-Z $%*+-./:) 45characters. 2 characters are encoded to 11bit length. In theory, 4296 characters or less can be stored in a QRcode.
     */
    define('QR_MODE_AN', 1);
    /**
     * Encoding mode 8bit byte data. In theory, 2953 characters or less can be stored in a QRcode.
     */
    define('QR_MODE_8B', 2);
    /**
     * Encoding mode KANJI. A KANJI character (multibyte character) is encoded to 13bit length. In theory, 1817 characters or less can be stored in a QRcode.
     */
    define('QR_MODE_KJ', 3);
    /**
     * Encoding mode STRUCTURED (currently unsupported)
     */
    define('QR_MODE_ST', 4);
    // -----------------------------------------------------
    // Levels of error correction.
    // QRcode has a function of an error correcting for miss reading that white is black.
    // Error correcting is defined in 4 level as below.
    /**
     * Error correction level L : About 7% or less errors can be corrected.
     */
    define('QR_ECLEVEL_L', 0);
    /**
     * Error correction level M : About 15% or less errors can be corrected.
     */
    define('QR_ECLEVEL_M', 1);
    /**
     * Error correction level Q : About 25% or less errors can be corrected.
     */
    define('QR_ECLEVEL_Q', 2);
    /**
     * Error correction level H : About 30% or less errors can be corrected.
     */
    define('QR_ECLEVEL_H', 3);
    // -----------------------------------------------------
    // Version. Size of QRcode is defined as version.
    // Version is from 1 to 40.
    // Version 1 is 21*21 matrix. And 4 modules increases whenever 1 version increases.
    // So version 40 is 177*177 matrix.
    /**
     * Maximum QR Code version.
     */
    define('QRSPEC_VERSION_MAX', 40);
    /**
     * Maximum matrix size for maximum version (version 40 is 177*177 matrix).
     */
    define('QRSPEC_WIDTH_MAX', 177);
    // -----------------------------------------------------
    /**
     * Matrix index to get width from $capacity array.
     */
    define('QRCAP_WIDTH', 0);
    /**
     * Matrix index to get number of words from $capacity array.
     */
    define('QRCAP_WORDS', 1);
    /**
     * Matrix index to get remainder from $capacity array.
     */
    define('QRCAP_REMINDER', 2);
    /**
     * Matrix index to get error correction level from $capacity array.
     */
    define('QRCAP_EC', 3);
    // -----------------------------------------------------
    // Structure (currently usupported)
    /**
     * Number of header bits for structured mode
     */
    define('STRUCTURE_HEADER_BITS', 20);
    /**
     * Max number of symbols for structured mode
     */
    define('MAX_STRUCTURED_SYMBOLS', 16);
    // -----------------------------------------------------
    // Masks
    /**
     * Down point base value for case 1 mask pattern (concatenation of same color in a line or a column)
     */
    define('N1', 3);
    /**
     * Down point base value for case 2 mask pattern (module block of same color)
     */
    define('N2', 3);
    /**
     * Down point base value for case 3 mask pattern (1:1:3:1:1(dark:bright:dark:bright:dark)pattern in a line or a column)
     */
    define('N3', 40);
    /**
     * Down point base value for case 4 mask pattern (ration of dark modules in whole)
     */
    define('N4', 10);
    // -----------------------------------------------------
    // Optimization settings
    /**
     * if true, estimates best mask (spec. default, but extremally slow; set to false to significant performance boost but (propably) worst quality code
     */
    define('QR_FIND_BEST_MASK', true);
    /**
     * if false, checks all masks available, otherwise value tells count of masks need to be checked, mask id are got randomly
     */
    define('QR_FIND_FROM_RANDOM', 2);
    /**
     * when QR_FIND_BEST_MASK === false
     */
    define('QR_DEFAULT_MASK', 2);

    // -----------------------------------------------------
} // end of definitions

// #*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#

if (!class_exists('QRcode', false)) {
    // for compaibility with PHP4
    if (!function_exists('str_split')) {
        /**
         * Convert a string to an array (needed for PHP4 compatibility)
         *
         * @param string $string       The input string.
         * @param int    $split_length Maximum length of the chunk.
         *
         * @return  If the optional split_length  parameter is specified, the returned array will be broken down into chunks with each being split_length  in length, otherwise each chunk will be one character in length. FALSE is returned if split_length is less than 1. If the split_length length exceeds the length of string , the entire string is returned as the first (and only) array element.
         */
        function str_split($string, $split_length = 1)
        {
            if ((strlen($string) > $split_length) OR (!$split_length)) {
                do {
                    $c       = strlen($string);
                    $parts[] = substr($string, 0, $split_length);
                    $string  = substr($string, $split_length);
                } while ($string !== false);
            } else {
                $parts = array($string);
            }

            return $parts;
        }
    }
    // #####################################################
    /**
     * Class to create QR-code arrays for TCPDF class.
     * QR Code symbol is a 2D barcode that can be scanned by handy terminals such as a mobile phone with CCD.
     * The capacity of QR Code is up to 7000 digits or 4000 characters, and has high robustness.
     * This class supports QR Code model 2, described in JIS (Japanese Industrial Standards) X0510:2004 or ISO/IEC 18004.
     * Currently the following features are not supported: ECI and FNC1 mode, Micro QR Code, QR Code model 1, Structured mode.
     *
     * This class is derived from "PHP QR Code encoder" by Dominik Dzienia (http://phpqrcode.sourceforge.net/) based on "libqrencode C library 3.1.1." by Kentaro Fukuchi (http://megaui.net/fukuchi/works/qrencode/index.en.html), contains Reed-Solomon code written by Phil Karn, KA9Q. QR Code is registered trademark of DENSO WAVE INCORPORATED (http://www.denso-wave.com/qrcode/index-e.html).
     * Please read comments on this class source file for full copyright and license information.
     *
     * @name QRcode
     * @package   com.tecnick.tcpdf
     * @abstract  Class for generating QR-code array for TCPDF.
     * @author    Nicola Asuni
     * @copyright 2010 Nicola Asuni - Tecnick.com S.r.l (www.tecnick.com) Via Della Pace, 11 - 09044 - Quartucciu (CA) - ITALY - www.tecnick.com - info@tecnick.com
     * @link      http://www.tcpdf.org
     * @license   http://www.gnu.org/copyleft/lesser.html LGPL
     * @version   1.0.002
     */
    class QRcode
    {

        /**
         * @var barcode array to be returned which is readable by TCPDF
         * @access protected
         */
        protected $barcode_array = array();

        /**
         * @var QR code version. Size of QRcode is defined as version. Version is from 1 to 40. Version 1 is 21*21 matrix. And 4 modules increases whenever 1 version increases. So version 40 is 177*177 matrix.
         * @access protected
         */
        protected $version = 0;

        /**
         * @var Levels of error correction. See definitions for possible values.
         * @access protected
         */
        protected $level = QR_ECLEVEL_L;

        /**
         * @var Encoding mode
         * @access protected
         */
        protected $hint = QR_MODE_8B;

        /**
         * @var if true the input string will be converted to uppercase
         * @access protected
         */
        protected $casesensitive = true;

        /**
         * @var structured QR code (not supported yet)
         * @access protected
         */
        protected $structured = 0;

        /**
         * @var mask data
         * @access protected
         */
        protected $data;

        // FrameFiller
        /**
         * @var width
         * @access protected
         */
        protected $width;

        /**
         * @var frame
         * @access protected
         */
        protected $frame;

        /**
         * @var X position of bit
         * @access protected
         */
        protected $x;

        /**
         * @var Y position of bit
         * @access protected
         */
        protected $y;

        /**
         * @var direction
         * @access protected
         */
        protected $dir;

        /**
         * @var single bit
         * @access protected
         */
        protected $bit;

        // ---- QRrawcode ----
        /**
         * @var data code
         * @access protected
         */
        protected $datacode = array();

        /**
         * @var error correction code
         * @access protected
         */
        protected $ecccode = array();

        /**
         * @var blocks
         * @access protected
         */
        protected $blocks;

        /**
         * @var Reed-Solomon blocks
         * @access protected
         */
        protected $rsblocks = array(); //of RSblock
        /**
         * @var counter
         * @access protected
         */
        protected $count;

        /**
         * @var data length
         * @access protected
         */
        protected $dataLength;

        /**
         * @var error correction length
         * @access protected
         */
        protected $eccLength;

        /**
         * @var b1
         * @access protected
         */
        protected $b1;

        // ---- QRmask ----
        /**
         * @var run length
         * @access protected
         */
        protected $runLength = array();

        // ---- QRsplit ----
        /**
         * @var input data string
         * @access protected
         */
        protected $dataStr = '';

        /**
         * @var input items
         * @access protected
         */
        protected $items;

        // Reed-Solomon items
        /**
         * @var Reed-Solomon items
         * @access protected
         */
        protected $rsitems = array();

        /**
         * @var array of frames
         * @access protected
         */
        protected $frames = array();

        /**
         * @var alphabet-numeric convesion table
         * @access protected
         */
        protected $anTable = array(
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, //
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, //
            36, -1, -1, -1, 37, 38, -1, -1, -1, -1, 39, 40, -1, 41, 42, 43, //
            0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 44, -1, -1, -1, -1, -1, //
            -1, 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, -1, -1, -1, -1, -1, //
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, //
            -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 //
        );

        /**
         * @var array Table of the capacity of symbols
         *         See Table 1 (pp.13) and Table 12-16 (pp.30-36), JIS X0510:2004.
         * @access protected
         */
        protected $capacity = array(
            array(0, 0, 0, array(0, 0, 0, 0)), //
            array(21, 26, 0, array(7, 10, 13, 17)), //  1
            array(25, 44, 7, array(10, 16, 22, 28)), //
            array(29, 70, 7, array(15, 26, 36, 44)), //
            array(33, 100, 7, array(20, 36, 52, 64)), //
            array(37, 134, 7, array(26, 48, 72, 88)), //  5
            array(41, 172, 7, array(36, 64, 96, 112)), //
            array(45, 196, 0, array(40, 72, 108, 130)), //
            array(49, 242, 0, array(48, 88, 132, 156)), //
            array(53, 292, 0, array(60, 110, 160, 192)), //
            array(57, 346, 0, array(72, 130, 192, 224)), // 10
            array(61, 404, 0, array(80, 150, 224, 264)), //
            array(65, 466, 0, array(96, 176, 260, 308)), //
            array(69, 532, 0, array(104, 198, 288, 352)), //
            array(73, 581, 3, array(120, 216, 320, 384)), //
            array(77, 655, 3, array(132, 240, 360, 432)), // 15
            array(81, 733, 3, array(144, 280, 408, 480)), //
            array(85, 815, 3, array(168, 308, 448, 532)), //
            array(89, 901, 3, array(180, 338, 504, 588)), //
            array(93, 991, 3, array(196, 364, 546, 650)), //
            array(97, 1085, 3, array(224, 416, 600, 700)), // 20
            array(101, 1156, 4, array(224, 442, 644, 750)), //
            array(105, 1258, 4, array(252, 476, 690, 816)), //
            array(109, 1364, 4, array(270, 504, 750, 900)), //
            array(113, 1474, 4, array(300, 560, 810, 960)), //
            array(117, 1588, 4, array(312, 588, 870, 1050)), // 25
            array(121, 1706, 4, array(336, 644, 952, 1110)), //
            array(125, 1828, 4, array(360, 700, 1020, 1200)), //
            array(129, 1921, 3, array(390, 728, 1050, 1260)), //
            array(133, 2051, 3, array(420, 784, 1140, 1350)), //
            array(137, 2185, 3, array(450, 812, 1200, 1440)), // 30
            array(141, 2323, 3, array(480, 868, 1290, 1530)), //
            array(145, 2465, 3, array(510, 924, 1350, 1620)), //
            array(149, 2611, 3, array(540, 980, 1440, 1710)), //
            array(153, 2761, 3, array(570, 1036, 1530, 1800)), //
            array(157, 2876, 0, array(570, 1064, 1590, 1890)), // 35
            array(161, 3034, 0, array(600, 1120, 1680, 1980)), //
            array(165, 3196, 0, array(630, 1204, 1770, 2100)), //
            array(169, 3362, 0, array(660, 1260, 1860, 2220)), //
            array(173, 3532, 0, array(720, 1316, 1950, 2310)), //
            array(177, 3706, 0, array(750, 1372, 2040, 2430)) // 40
        );

        /**
         * @var array Length indicator
         * @access protected
         */
        protected $lengthTableBits = array(
            array(10, 12, 14),
            array(9, 11, 13),
            array(8, 16, 16),
            array(8, 10, 12)
        );

        /**
         * @var array Table of the error correction code (Reed-Solomon block)
         *         See Table 12-16 (pp.30-36), JIS X0510:2004.
         * @access protected
         */
        protected $eccTable = array(
            array(array(0, 0), array(0, 0), array(0, 0), array(0, 0)), //
            array(array(1, 0), array(1, 0), array(1, 0), array(1, 0)), //  1
            array(array(1, 0), array(1, 0), array(1, 0), array(1, 0)), //
            array(array(1, 0), array(1, 0), array(2, 0), array(2, 0)), //
            array(array(1, 0), array(2, 0), array(2, 0), array(4, 0)), //
            array(array(1, 0), array(2, 0), array(2, 2), array(2, 2)), //  5
            array(array(2, 0), array(4, 0), array(4, 0), array(4, 0)), //
            array(array(2, 0), array(4, 0), array(2, 4), array(4, 1)), //
            array(array(2, 0), array(2, 2), array(4, 2), array(4, 2)), //
            array(array(2, 0), array(3, 2), array(4, 4), array(4, 4)), //
            array(array(2, 2), array(4, 1), array(6, 2), array(6, 2)), // 10
            array(array(4, 0), array(1, 4), array(4, 4), array(3, 8)), //
            array(array(2, 2), array(6, 2), array(4, 6), array(7, 4)), //
            array(array(4, 0), array(8, 1), array(8, 4), array(12, 4)), //
            array(array(3, 1), array(4, 5), array(11, 5), array(11, 5)), //
            array(array(5, 1), array(5, 5), array(5, 7), array(11, 7)), // 15
            array(array(5, 1), array(7, 3), array(15, 2), array(3, 13)), //
            array(array(1, 5), array(10, 1), array(1, 15), array(2, 17)), //
            array(array(5, 1), array(9, 4), array(17, 1), array(2, 19)), //
            array(array(3, 4), array(3, 11), array(17, 4), array(9, 16)), //
            array(array(3, 5), array(3, 13), array(15, 5), array(15, 10)), // 20
            array(array(4, 4), array(17, 0), array(17, 6), array(19, 6)), //
            array(array(2, 7), array(17, 0), array(7, 16), array(34, 0)), //
            array(array(4, 5), array(4, 14), array(11, 14), array(16, 14)), //
            array(array(6, 4), array(6, 14), array(11, 16), array(30, 2)), //
            array(array(8, 4), array(8, 13), array(7, 22), array(22, 13)), // 25
            array(array(10, 2), array(19, 4), array(28, 6), array(33, 4)), //
            array(array(8, 4), array(22, 3), array(8, 26), array(12, 28)), //
            array(array(3, 10), array(3, 23), array(4, 31), array(11, 31)), //
            array(array(7, 7), array(21, 7), array(1, 37), array(19, 26)), //
            array(array(5, 10), array(19, 10), array(15, 25), array(23, 25)), // 30
            array(array(13, 3), array(2, 29), array(42, 1), array(23, 28)), //
            array(array(17, 0), array(10, 23), array(10, 35), array(19, 35)), //
            array(array(17, 1), array(14, 21), array(29, 19), array(11, 46)), //
            array(array(13, 6), array(14, 23), array(44, 7), array(59, 1)), //
            array(array(12, 7), array(12, 26), array(39, 14), array(22, 41)), // 35
            array(array(6, 14), array(6, 34), array(46, 10), array(2, 64)), //
            array(array(17, 4), array(29, 14), array(49, 10), array(24, 46)), //
            array(array(4, 18), array(13, 32), array(48, 14), array(42, 32)), //
            array(array(20, 4), array(40, 7), array(43, 22), array(10, 67)), //
            array(array(19, 6), array(18, 31), array(34, 34), array(20, 61)) // 40
        );

        /**
         * @var array Positions of alignment patterns.
         *         This array includes only the second and the third position of the alignment patterns. Rest of them can be calculated from the distance between them.
         *         See Table 1 in Appendix E (pp.71) of JIS X0510:2004.
         * @access protected
         */
        protected $alignmentPattern = array(
            array(0, 0),
            array(0, 0), array(18, 0), array(22, 0), array(26, 0), array(30, 0), //  1- 5
            array(34, 0), array(22, 38), array(24, 42), array(26, 46), array(28, 50), //  6-10
            array(30, 54), array(32, 58), array(34, 62), array(26, 46), array(26, 48), // 11-15
            array(26, 50), array(30, 54), array(30, 56), array(30, 58), array(34, 62), // 16-20
            array(28, 50), array(26, 50), array(30, 54), array(28, 54), array(32, 58), // 21-25
            array(30, 58), array(34, 62), array(26, 50), array(30, 54), array(26, 52), // 26-30
            array(30, 56), array(34, 60), array(30, 58), array(34, 62), array(30, 54), // 31-35
            array(24, 50), array(28, 54), array(32, 58), array(26, 54), array(30, 58) // 35-40
        );

        /**
         * @var array Version information pattern (BCH coded).
         *         See Table 1 in Appendix D (pp.68) of JIS X0510:2004.
         *         size: [QRSPEC_VERSION_MAX - 6]
         * @access protected
         */
        protected $versionPattern = array(
            0x07c94, 0x085bc, 0x09a99, 0x0a4d3, 0x0bbf6, 0x0c762, 0x0d847, 0x0e60d, //
            0x0f928, 0x10b78, 0x1145d, 0x12a17, 0x13532, 0x149a6, 0x15683, 0x168c9, //
            0x177ec, 0x18ec4, 0x191e1, 0x1afab, 0x1b08e, 0x1cc1a, 0x1d33f, 0x1ed75, //
            0x1f250, 0x209d5, 0x216f0, 0x228ba, 0x2379f, 0x24b0b, 0x2542e, 0x26a64, //
            0x27541, 0x28c69
        );

        /**
         * @var array Format information
         * @access protected
         */
        protected $formatInfo = array(
            array(0x77c4, 0x72f3, 0x7daa, 0x789d, 0x662f, 0x6318, 0x6c41, 0x6976), //
            array(0x5412, 0x5125, 0x5e7c, 0x5b4b, 0x45f9, 0x40ce, 0x4f97, 0x4aa0), //
            array(0x355f, 0x3068, 0x3f31, 0x3a06, 0x24b4, 0x2183, 0x2eda, 0x2bed), //
            array(0x1689, 0x13be, 0x1ce7, 0x19d0, 0x0762, 0x0255, 0x0d0c, 0x083b) //
        );

        // -------------------------------------------------
        // -------------------------------------------------
        /**
         * This is the class constructor.
         * Creates a QRcode object
         *
         * @param string $code    code to represent using QRcode
         * @param string $eclevel error level: <ul><li>L : About 7% or less errors can be corrected.</li><li>M : About 15% or less errors can be corrected.</li><li>Q : About 25% or less errors can be corrected.</li><li>H : About 30% or less errors can be corrected.</li></ul>
         *
         * @access public
         * @since  1.0.000
         */
        public function __construct($code, $eclevel = 'L')
        {
            $barcode_array = array();
            if ((is_null($code)) OR ($code == '\0') OR ($code == '')) {
                return false;
            }
            // set error correction level
            $this->level = array_search($eclevel, array('L', 'M', 'Q', 'H'));
            if ($this->level === false) {
                $this->level = QR_ECLEVEL_L;
            }
            if (($this->hint != QR_MODE_8B) AND ($this->hint != QR_MODE_KJ)) {
                return false;
            }
            if (($this->version < 0) OR ($this->version > QRSPEC_VERSION_MAX)) {
                return false;
            }
            $this->items = array();
            $this->encodeString($code);
            $qrTab                     = $this->binarize($this->data);
            $size                      = count($qrTab);
            $barcode_array['num_rows'] = $size;
            $barcode_array['num_cols'] = $size;
            $barcode_array['bcode']    = array();
            foreach ($qrTab as $line) {
                $arrAdd = array();
                foreach (str_split($line) as $char) {
                    $arrAdd[] = ($char == '1') ? 1 : 0;
                }
                $barcode_array['bcode'][] = $arrAdd;
            }
            $this->barcode_array = $barcode_array;
        }

        /**
         * Returns a barcode array which is readable by TCPDF
         * @return array barcode array readable by TCPDF;
         * @access public
         */
        public function getBarcodeArray()
        {
            return $this->barcode_array;
        }

        /**
         * Convert the frame in binary form
         *
         * @param array $frame array to binarize
         *
         * @return array frame in binary form
         */
        protected function binarize($frame)
        {
            $len = count($frame);
            // the frame is square (width = height)
            foreach ($frame as &$frameLine) {
                for ($i = 0; $i < $len; $i++) {
                    $frameLine[$i] = (ord($frameLine[$i]) & 1) ? '1' : '0';
                }
            }

            return $frame;
        }

        /**
         * Encode the input string to QR code
         *
         * @param string $string input string to encode
         */
        protected function encodeString($string)
        {
            $this->dataStr = $string;
            if (!$this->casesensitive) {
                $this->toUpper();
            }
            $ret = $this->splitString();
            if ($ret < 0) {
                return NULL;
            }
            $this->encodeMask(-1);
        }

        /**
         * Encode mask
         *
         * @param int $mask masking mode
         */
        protected function encodeMask($mask)
        {
            $spec           = array(0, 0, 0, 0, 0);
            $this->datacode = $this->getByteStream($this->items);
            if (is_null($this->datacode)) {
                return NULL;
            }
            $spec             = $this->getEccSpec($this->version, $this->level, $spec);
            $this->b1         = $this->rsBlockNum1($spec);
            $this->dataLength = $this->rsDataLength($spec);
            $this->eccLength  = $this->rsEccLength($spec);
            $this->ecccode    = array_fill(0, $this->eccLength, 0);
            $this->blocks     = $this->rsBlockNum($spec);
            $ret              = $this->init($spec);
            if ($ret < 0) {
                return NULL;
            }
            $this->count = 0;
            $this->width = $this->getWidth($this->version);
            $this->frame = $this->newFrame($this->version);
            $this->x     = $this->width - 1;
            $this->y     = $this->width - 1;
            $this->dir   = -1;
            $this->bit   = -1;
            // inteleaved data and ecc codes
            for ($i = 0; $i < ($this->dataLength + $this->eccLength); $i++) {
                $code = $this->getCode();
                $bit  = 0x80;
                for ($j = 0; $j < 8; $j++) {
                    $addr = $this->getNextPosition();
                    $this->setFrameAt($addr, 0x02 | (($bit & $code) != 0));
                    $bit = $bit >> 1;
                }
            }
            // remainder bits
            $j = $this->getRemainder($this->version);
            for ($i = 0; $i < $j; $i++) {
                $addr = $this->getNextPosition();
                $this->setFrameAt($addr, 0x02);
            }
            // masking
            $this->runLength = array_fill(0, QRSPEC_WIDTH_MAX + 1, 0);
            if ($mask < 0) {
                if (QR_FIND_BEST_MASK) {
                    $masked = $this->mask($this->width, $this->frame, $this->level);
                } else {
                    $masked = $this->makeMask($this->width, $this->frame, (intval(QR_DEFAULT_MASK) % 8), $this->level);
                }
            } else {
                $masked = $this->makeMask($this->width, $this->frame, $mask, $this->level);
            }
            if ($masked == NULL) {
                return NULL;
            }
            $this->data = $masked;
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // FrameFiller
        /**
         * Set frame value at specified position
         *
         * @param array $at  x,y position
         * @param int   $val value of the character to set
         */
        protected function setFrameAt($at, $val)
        {
            $this->frame[$at['y']][$at['x']] = chr($val);
        }

        /**
         * Get frame value at specified position
         *
         * @param array $at x,y position
         *
         * @return value at specified position
         */
        protected function getFrameAt($at)
        {
            return ord($this->frame[$at['y']][$at['x']]);
        }

        /**
         * Return the next frame position
         * @return array of x,y coordinates
         */
        protected function getNextPosition()
        {
            do {
                if ($this->bit == -1) {
                    $this->bit = 0;

                    return array('x' => $this->x, 'y' => $this->y);
                }
                $x = $this->x;
                $y = $this->y;
                $w = $this->width;
                if ($this->bit == 0) {
                    $x--;
                    $this->bit++;
                } else {
                    $x++;
                    $y += $this->dir;
                    $this->bit--;
                }
                if ($this->dir < 0) {
                    if ($y < 0) {
                        $y = 0;
                        $x -= 2;
                        $this->dir = 1;
                        if ($x == 6) {
                            $x--;
                            $y = 9;
                        }
                    }
                } else {
                    if ($y == $w) {
                        $y = $w - 1;
                        $x -= 2;
                        $this->dir = -1;
                        if ($x == 6) {
                            $x--;
                            $y -= 8;
                        }
                    }
                }
                if (($x < 0) OR ($y < 0)) {
                    return NULL;
                }
                $this->x = $x;
                $this->y = $y;
            } while (ord($this->frame[$y][$x]) & 0x80);

            return array('x' => $x, 'y' => $y);
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // QRrawcode
        /**
         * Initialize code.
         *
         * @param array $spec array of ECC specification
         *
         * @return 0 in case of success, -1 in case of error
         */
        protected function init($spec)
        {
            $dl      = $this->rsDataCodes1($spec);
            $el      = $this->rsEccCodes1($spec);
            $rs      = $this->init_rs(8, 0x11d, 0, 1, $el, 255 - $dl - $el);
            $blockNo = 0;
            $dataPos = 0;
            $eccPos  = 0;
            $endfor  = $this->rsBlockNum1($spec);
            for ($i = 0; $i < $endfor; ++$i) {
                $ecc                                    = array_slice($this->ecccode, $eccPos);
                $this->rsblocks[$blockNo]               = array();
                $this->rsblocks[$blockNo]['dataLength'] = $dl;
                $this->rsblocks[$blockNo]['data']       = array_slice($this->datacode, $dataPos);
                $this->rsblocks[$blockNo]['eccLength']  = $el;
                $ecc                                    = $this->encode_rs_char($rs, $this->rsblocks[$blockNo]['data'], $ecc);
                $this->rsblocks[$blockNo]['ecc']        = $ecc;
                $this->ecccode                          = array_merge(array_slice($this->ecccode, 0, $eccPos), $ecc);
                $dataPos += $dl;
                $eccPos += $el;
                $blockNo++;
            }
            if ($this->rsBlockNum2($spec) == 0) {
                return 0;
            }
            $dl = $this->rsDataCodes2($spec);
            $el = $this->rsEccCodes2($spec);
            $rs = $this->init_rs(8, 0x11d, 0, 1, $el, 255 - $dl - $el);
            if ($rs == NULL) {
                return -1;
            }
            $endfor = $this->rsBlockNum2($spec);
            for ($i = 0; $i < $endfor; ++$i) {
                $ecc                                    = array_slice($this->ecccode, $eccPos);
                $this->rsblocks[$blockNo]               = array();
                $this->rsblocks[$blockNo]['dataLength'] = $dl;
                $this->rsblocks[$blockNo]['data']       = array_slice($this->datacode, $dataPos);
                $this->rsblocks[$blockNo]['eccLength']  = $el;
                $ecc                                    = $this->encode_rs_char($rs, $this->rsblocks[$blockNo]['data'], $ecc);
                $this->rsblocks[$blockNo]['ecc']        = $ecc;
                $this->ecccode                          = array_merge(array_slice($this->ecccode, 0, $eccPos), $ecc);
                $dataPos += $dl;
                $eccPos += $el;
                $blockNo++;
            }

            return 0;
        }

        /**
         * Return Reed-Solomon block code.
         * @return array rsblocks
         */
        protected function getCode()
        {
            if ($this->count < $this->dataLength) {
                $row = $this->count % $this->blocks;
                $col = $this->count / $this->blocks;
                if ($col >= $this->rsblocks[0]['dataLength']) {
                    $row += $this->b1;
                }
                $ret = $this->rsblocks[$row]['data'][$col];
            } elseif ($this->count < $this->dataLength + $this->eccLength) {
                $row = ($this->count - $this->dataLength) % $this->blocks;
                $col = ($this->count - $this->dataLength) / $this->blocks;
                $ret = $this->rsblocks[$row]['ecc'][$col];
            } else {
                return 0;
            }
            $this->count++;

            return $ret;
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // QRmask
        /**
         * Write Format Information on frame and returns the number of black bits
         *
         * @param int   $width frame width
         * @param array $frame frame
         * @param array $mask  masking mode
         * @param int   $level error correction level
         *
         * @return int blacks
         */
        protected function writeFormatInformation($width, &$frame, $mask, $level)
        {
            $blacks = 0;
            $format = $this->getFormatInfo($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;
        }

        /**
         * mask0
         *
         * @param int $x X position
         * @param int $y Y position
         *
         * @return int mask
         */
        protected function mask0($x, $y)
        {
            return ($x + $y) & 1;
        }

        /**
         * mask1
         *
         * @param int $x X position
         * @param int $y Y position
         *
         * @return int mask
         */
        protected function mask1($x, $y)
        {
            return ($y & 1);
        }

        /**
         * mask2
         *
         * @param int $x X position
         * @param int $y Y position
         *
         * @return int mask
         */
        protected function mask2($x, $y)
        {
            return ($x % 3);
        }

        /**
         * mask3
         *
         * @param int $x X position
         * @param int $y Y position
         *
         * @return int mask
         */
        protected function mask3($x, $y)
        {
            return ($x + $y) % 3;
        }

        /**
         * mask4
         *
         * @param int $x X position
         * @param int $y Y position
         *
         * @return int mask
         */
        protected function mask4($x, $y)
        {
            return (((int)($y / 2)) + ((int)($x / 3))) & 1;
        }

        /**
         * mask5
         *
         * @param int $x X position
         * @param int $y Y position
         *
         * @return int mask
         */
        protected function mask5($x, $y)
        {
            return (($x * $y) & 1) + ($x * $y) % 3;
        }

        /**
         * mask6
         *
         * @param int $x X position
         * @param int $y Y position
         *
         * @return int mask
         */
        protected function mask6($x, $y)
        {
            return ((($x * $y) & 1) + ($x * $y) % 3) & 1;
        }

        /**
         * mask7
         *
         * @param int $x X position
         * @param int $y Y position
         *
         * @return int mask
         */
        protected function mask7($x, $y)
        {
            return ((($x * $y) % 3) + (($x + $y) & 1)) & 1;
        }

        /**
         * Return bitmask
         *
         * @param int   $maskNo mask number
         * @param int   $width  width
         * @param array $frame  frame
         *
         * @return array bitmask
         */
        protected function generateMaskNo($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 {
                        $maskFunc        = call_user_func(array($this, 'mask' . $maskNo), $x, $y);
                        $bitMask[$y][$x] = ($maskFunc == 0) ? 1 : 0;
                    }
                }
            }

            return $bitMask;
        }

        /**
         * makeMaskNo
         *
         * @param int     $maskNo
         * @param int     $width
         * @param int     $s
         * @param int     $d
         * @param boolean $maskGenOnly
         *
         * @return int b
         */
        protected function makeMaskNo($maskNo, $width, $s, &$d, $maskGenOnly = false)
        {
            $b       = 0;
            $bitMask = array();
            $bitMask = $this->generateMaskNo($maskNo, $width, $s, $d);
            if ($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;
        }

        /**
         * makeMask
         *
         * @param int   $width
         * @param array $frame
         * @param int   $maskNo
         * @param int   $level
         *
         * @return array mask
         */
        protected function makeMask($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;
        }

        /**
         * calcN1N3
         *
         * @param int $length
         *
         * @return int demerit
         */
        protected function calcN1N3($length)
        {
            $demerit = 0;
            for ($i = 0; $i < $length; ++$i) {
                if ($this->runLength[$i] >= 5) {
                    $demerit += (N1 + ($this->runLength[$i] - 5));
                }
                if ($i & 1) {
                    if (($i >= 3) AND ($i < ($length - 2)) AND ($this->runLength[$i] % 3 == 0)) {
                        $fact = (int)($this->runLength[$i] / 3);
                        if (($this->runLength[$i - 2] == $fact)
                            AND ($this->runLength[$i - 1] == $fact)
                            AND ($this->runLength[$i + 1] == $fact)
                            AND ($this->runLength[$i + 2] == $fact)
                        ) {
                            if (($this->runLength[$i - 3] < 0) OR ($this->runLength[$i - 3] >= (4 * $fact))) {
                                $demerit += N3;
                            } elseif ((($i + 3) >= $length) OR ($this->runLength[$i + 3] >= (4 * $fact))) {
                                $demerit += N3;
                            }
                        }
                    }
                }
            }

            return $demerit;
        }

        /**
         * evaluateSymbol
         *
         * @param int   $width
         * @param array $frame
         *
         * @return int demerit
         */
        protected function evaluateSymbol($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 (($x > 0) AND ($y > 0)) {
                        $b22 = ord($frameY[$x]) & ord($frameY[$x - 1]) & ord($frameYM[$x]) & ord($frameYM[$x - 1]);
                        $w22 = ord($frameY[$x]) | ord($frameY[$x - 1]) | ord($frameYM[$x]) | ord($frameYM[$x - 1]);
                        if (($b22 | ($w22 ^ 1)) & 1) {
                            $demerit += N2;
                        }
                    }
                    if (($x == 0) AND (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 (($y == 0) AND (ord($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;
        }

        /**
         * mask
         *
         * @param int   $width
         * @param array $frame
         * @param int   $level
         *
         * @return array best mask
         */
        protected function mask($width, $frame, $level)
        {
            $minDemerit    = PHP_INT_MAX;
            $bestMaskNum   = 0;
            $bestMask      = array();
            $checked_masks = array(0, 1, 2, 3, 4, 5, 6, 7);
            if (QR_FIND_FROM_RANDOM !== 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;
                $blacks  = 0;
                $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;
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // QRsplit
        /**
         * Return true if the character at specified position is a number
         *
         * @param string $str string
         * @param int    $pos characted position
         *
         * @return boolean true of false
         */
        protected function isdigitat($str, $pos)
        {
            if ($pos >= strlen($str)) {
                return false;
            }

            return ((ord($str[$pos]) >= ord('0')) && (ord($str[$pos]) <= ord('9')));
        }

        /**
         * Return true if the character at specified position is an alphanumeric character
         *
         * @param string $str string
         * @param int    $pos characted position
         *
         * @return boolean true of false
         */
        protected function isalnumat($str, $pos)
        {
            if ($pos >= strlen($str)) {
                return false;
            }

            return ($this->lookAnTable(ord($str[$pos])) >= 0);
        }

        /**
         * identifyMode
         *
         * @param int $pos
         *
         * @return int mode
         */
        protected function identifyMode($pos)
        {
            if ($pos >= strlen($this->dataStr)) {
                return QR_MODE_NL;
            }
            $c = $this->dataStr[$pos];
            if ($this->isdigitat($this->dataStr, $pos)) {
                return QR_MODE_NM;
            } elseif ($this->isalnumat($this->dataStr, $pos)) {
                return QR_MODE_AN;
            } elseif ($this->hint == QR_MODE_KJ) {
                if ($pos + 1 < strlen($this->dataStr)) {
                    $d    = $this->dataStr[$pos + 1];
                    $word = (ord($c) << 8) | ord($d);
                    if (($word >= 0x8140 && $word <= 0x9ffc) OR ($word >= 0xe040 && $word <= 0xebbf)) {
                        return QR_MODE_KJ;
                    }
                }
            }

            return QR_MODE_8B;
        }

        /**
         * eatNum
         * @return int run
         */
        protected function eatNum()
        {
            $ln = $this->lengthIndicator(QR_MODE_NM, $this->version);
            $p  = 0;
            while ($this->isdigitat($this->dataStr, $p)) {
                $p++;
            }
            $run  = $p;
            $mode = $this->identifyMode($p);
            if ($mode == QR_MODE_8B) {
                $dif = $this->estimateBitsModeNum($run) + 4 + $ln
                    + $this->estimateBitsMode8(1) // + 4 + l8
                    - $this->estimateBitsMode8($run + 1); // - 4 - l8
                if ($dif > 0) {
                    return $this->eat8();
                }
            }
            if ($mode == QR_MODE_AN) {
                $dif = $this->estimateBitsModeNum($run) + 4 + $ln
                    + $this->estimateBitsModeAn(1) // + 4 + la
                    - $this->estimateBitsModeAn($run + 1);
                // - 4 - la
                if ($dif > 0) {
                    return $this->eatAn();
                }
            }
            $this->items = $this->appendNewInputItem($this->items, QR_MODE_NM, $run, str_split($this->dataStr));

            return $run;
        }

        /**
         * eatAn
         * @return int run
         */
        protected function eatAn()
        {
            $la = $this->lengthIndicator(QR_MODE_AN, $this->version);
            $ln = $this->lengthIndicator(QR_MODE_NM, $this->version);
            $p  = 0;
            while ($this->isalnumat($this->dataStr, $p)) {
                if ($this->isdigitat($this->dataStr, $p)) {
                    $q = $p;
                    while ($this->isdigitat($this->dataStr, $q)) {
                        $q++;
                    }
                    $dif = $this->estimateBitsModeAn($p) // + 4 + la
                        + $this->estimateBitsModeNum($q - $p) + 4 + $ln
                        - $this->estimateBitsModeAn($q); // - 4 - la
                    if ($dif < 0) {
                        break;
                    } else {
                        $p = $q;
                    }
                } else {
                    $p++;
                }
            }
            $run = $p;
            if (!$this->isalnumat($this->dataStr, $p)) {
                $dif = $this->estimateBitsModeAn($run) + 4 + $la
                    + $this->estimateBitsMode8(1) // + 4 + l8
                    - $this->estimateBitsMode8($run + 1); // - 4 - l8
                if ($dif > 0) {
                    return $this->eat8();
                }
            }
            $this->items = $this->appendNewInputItem($this->items, QR_MODE_AN, $run, str_split($this->dataStr));

            return $run;
        }

        /**
         * eatKanji
         * @return int run
         */
        protected function eatKanji()
        {
            $p = 0;
            while ($this->identifyMode($p) == QR_MODE_KJ) {
                $p += 2;
            }
            $this->items = $this->appendNewInputItem($this->items, QR_MODE_KJ, $p, str_split($this->dataStr));

            return $run;
        }

        /**
         * eat8
         * @return int run
         */
        protected function eat8()
        {
            $la         = $this->lengthIndicator(QR_MODE_AN, $this->version);
            $ln         = $this->lengthIndicator(QR_MODE_NM, $this->version);
            $p          = 1;
            $dataStrLen = strlen($this->dataStr);
            while ($p < $dataStrLen) {
                $mode = $this->identifyMode($p);
                if ($mode == QR_MODE_KJ) {
                    break;
                }
                if ($mode == QR_MODE_NM) {
                    $q = $p;
                    while ($this->isdigitat($this->dataStr, $q)) {
                        $q++;
                    }
                    $dif = $this->estimateBitsMode8($p) // + 4 + l8
                        + $this->estimateBitsModeNum($q - $p) + 4 + $ln
                        - $this->estimateBitsMode8($q); // - 4 - l8
                    if ($dif < 0) {
                        break;
                    } else {
                        $p = $q;
                    }
                } elseif ($mode == QR_MODE_AN) {
                    $q = $p;
                    while ($this->isalnumat($this->dataStr, $q)) {
                        $q++;
                    }
                    $dif = $this->estimateBitsMode8($p) // + 4 + l8
                        + $this->estimateBitsModeAn($q - $p) + 4 + $la
                        - $this->estimateBitsMode8($q); // - 4 - l8
                    if ($dif < 0) {
                        break;
                    } else {
                        $p = $q;
                    }
                } else {
                    $p++;
                }
            }
            $run         = $p;
            $this->items = $this->appendNewInputItem($this->items, QR_MODE_8B, $run, str_split($this->dataStr));

            return $run;
        }

        /**
         * splitString
         */
        protected function splitString()
        {
            while (strlen($this->dataStr) > 0) {
                if ($this->dataStr == '') {
                    return 0;
                }
                $mode = $this->identifyMode(0);
                switch ($mode) {
                    case QR_MODE_NM:
                    {
                        $length = $this->eatNum();
                        break;
                    }
                    case QR_MODE_AN:
                    {
                        $length = $this->eatAn();
                        break;
                    }
                    case QR_MODE_KJ:
                    {
                        if ($hint == QR_MODE_KJ) {
                            $length = $this->eatKanji();
                        } else {
                            $length = $this->eat8();
                        }
                        break;
                    }
                    default:
                        {
                        $length = $this->eat8();
                        break;
                        }
                }
                if ($length == 0) {
                    return 0;
                }
                if ($length < 0) {
                    return -1;
                }
                $this->dataStr = substr($this->dataStr, $length);
            }
        }

        /**
         * toUpper
         */
        protected function toUpper()
        {
            $stringLen = strlen($this->dataStr);
            $p         = 0;
            while ($p < $stringLen) {
                $mode = $this->identifyMode(substr($this->dataStr, $p), $this->hint);
                if ($mode == QR_MODE_KJ) {
                    $p += 2;
                } else {
                    if ((ord($this->dataStr[$p]) >= ord('a')) AND (ord($this->dataStr[$p]) <= ord('z'))) {
                        $this->dataStr[$p] = chr(ord($this->dataStr[$p]) - 32);
                    }
                    $p++;
                }
            }

            return $this->dataStr;
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // QRinputItem
        /**
         * newInputItem
         *
         * @param int   $mode
         * @param int   $size
         * @param array $data
         * @param array $bstream
         *
         * @return array input item
         */
        protected function newInputItem($mode, $size, $data, $bstream = null)
        {
            $setData = array_slice($data, 0, $size);
            if (count($setData) < $size) {
                $setData = array_merge($setData, array_fill(0, ($size - count($setData)), 0));
            }
            if (!$this->check($mode, $size, $setData)) {
                return NULL;
            }
            $inputitem            = array();
            $inputitem['mode']    = $mode;
            $inputitem['size']    = $size;
            $inputitem['data']    = $setData;
            $inputitem['bstream'] = $bstream;

            return $inputitem;
        }

        /**
         * encodeModeNum
         *
         * @param array $inputitem
         * @param int   $version
         *
         * @return array input item
         */
        protected function encodeModeNum($inputitem, $version)
        {
            $words                = (int)($inputitem['size'] / 3);
            $inputitem['bstream'] = array();
            $val                  = 0x1;
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, $val);
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], $this->lengthIndicator(QR_MODE_NM, $version), $inputitem['size']);
            for ($i = 0; $i < $words; ++$i) {
                $val = (ord($inputitem['data'][$i * 3]) - ord('0')) * 100;
                $val += (ord($inputitem['data'][$i * 3 + 1]) - ord('0')) * 10;
                $val += (ord($inputitem['data'][$i * 3 + 2]) - ord('0'));
                $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 10, $val);
            }
            if ($inputitem['size'] - $words * 3 == 1) {
                $val                  = ord($inputitem['data'][$words * 3]) - ord('0');
                $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, $val);
            } elseif (($inputitem['size'] - ($words * 3)) == 2) {
                $val = (ord($inputitem['data'][$words * 3]) - ord('0')) * 10;
                $val += (ord($inputitem['data'][$words * 3 + 1]) - ord('0'));
                $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 7, $val);
            }

            return $inputitem;
        }

        /**
         * encodeModeAn
         *
         * @param array $inputitem
         * @param int   $version
         *
         * @return array input item
         */
        protected function encodeModeAn($inputitem, $version)
        {
            $words                = (int)($inputitem['size'] / 2);
            $inputitem['bstream'] = array();
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, 0x02);
            $inputitem['bstream'] = $this->appendNum(v, $this->lengthIndicator(QR_MODE_AN, $version), $inputitem['size']);
            for ($i = 0; $i < $words; ++$i) {
                $val = (int)$this->lookAnTable(ord($inputitem['data'][$i * 2])) * 45;
                $val += (int)$this->lookAnTable(ord($inputitem['data'][$i * 2 + 1]));
                $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 11, $val);
            }
            if ($inputitem['size'] & 1) {
                $val                  = $this->lookAnTable(ord($inputitem['data'][($words * 2)]));
                $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 6, $val);
            }

            return $inputitem;
        }

        /**
         * encodeMode8
         *
         * @param array $inputitem
         * @param int   $version
         *
         * @return array input item
         */
        protected function encodeMode8($inputitem, $version)
        {
            $inputitem['bstream'] = array();
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, 0x4);
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], $this->lengthIndicator(QR_MODE_8B, $version), $inputitem['size']);
            for ($i = 0; $i < $inputitem['size']; ++$i) {
                $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 8, ord($inputitem['data'][$i]));
            }

            return $inputitem;
        }

        /**
         * encodeModeKanji
         *
         * @param array $inputitem
         * @param int   $version
         *
         * @return array input item
         */
        protected function encodeModeKanji($inputitem, $version)
        {
            $inputitem['bstream'] = array();
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, 0x8);
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], $this->lengthIndicator(QR_MODE_KJ, $version), (int)($inputitem['size'] / 2));
            for ($i = 0; $i < $inputitem['size']; $i += 2) {
                $val = (ord($inputitem['data'][$i]) << 8) | ord($inputitem['data'][$i + 1]);
                if ($val <= 0x9ffc) {
                    $val -= 0x8140;
                } else {
                    $val -= 0xc140;
                }
                $h                    = ($val >> 8) * 0xc0;
                $val                  = ($val & 0xff) + $h;
                $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 13, $val);
            }

            return $inputitem;
        }

        /**
         * encodeModeStructure
         *
         * @param array $inputitem
         *
         * @return array input item
         */
        protected function encodeModeStructure($inputitem)
        {
            $inputitem['bstream'] = array();
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, 0x03);
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, ord($inputitem['data'][1]) - 1);
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, ord($inputitem['data'][0]) - 1);
            $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 8, ord($inputitem['data'][2]));

            return $inputitem;
        }

        /**
         * encodeBitStream
         *
         * @param array $inputitem
         * @param int   $version
         *
         * @return array input item
         */
        protected function encodeBitStream($inputitem, $version)
        {
            $inputitem['bstream'] = array();
            $words                = $this->maximumWords($inputitem['mode'], $version);
            if ($inputitem['size'] > $words) {
                $st1                  = $this->newInputItem($inputitem['mode'], $words, $inputitem['data']);
                $st2                  = $this->newInputItem($inputitem['mode'], $inputitem['size'] - $words, array_slice($inputitem['data'], $words));
                $st1                  = $this->encodeBitStream($st1, $version);
                $st2                  = $this->encodeBitStream($st2, $version);
                $inputitem['bstream'] = array();
                $inputitem['bstream'] = $this->appendBitstream($inputitem['bstream'], $st1['bstream']);
                $inputitem['bstream'] = $this->appendBitstream($inputitem['bstream'], $st2['bstream']);
            } else {
                switch ($inputitem['mode']) {
                    case QR_MODE_NM:
                    {
                        $inputitem = $this->encodeModeNum($inputitem, $version);
                        break;
                    }
                    case QR_MODE_AN:
                    {
                        $inputitem = $this->encodeModeAn($inputitem, $version);
                        break;
                    }
                    case QR_MODE_8B:
                    {
                        $inputitem = $this->encodeMode8($inputitem, $version);
                        break;
                    }
                    case QR_MODE_KJ:
                    {
                        $inputitem = $this->encodeModeKanji($inputitem, $version);
                        break;
                    }
                    case QR_MODE_ST:
                    {
                        $inputitem = $this->encodeModeStructure($inputitem);
                        break;
                    }
                    default:
                        {
                        break;
                        }
                }
            }

            return $inputitem;
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // QRinput
        /**
         * Append data to an input object.
         * The data is copied and appended to the input object.
         *
         * @param       array items input items
         * @param int   $mode encoding mode.
         * @param int   $size size of data (byte).
         * @param array $data array of input data.
         *
         * @return items
         *
         */
        protected function appendNewInputItem($items, $mode, $size, $data)
        {
            $items[] = $this->newInputItem($mode, $size, $data);

            return $items;
        }

        /**
         * insertStructuredAppendHeader
         *
         * @param array $items
         * @param int   $size
         * @param int   $index
         * @param int   $parity
         *
         * @return array items
         */
        protected function insertStructuredAppendHeader($items, $size, $index, $parity)
        {
            if ($size > MAX_STRUCTURED_SYMBOLS) {
                return -1;
            }
            if (($index <= 0) OR ($index > MAX_STRUCTURED_SYMBOLS)) {
                return -1;
            }
            $buf   = array($size, $index, $parity);
            $entry = $this->newInputItem(QR_MODE_ST, 3, buf);
            array_unshift($items, $entry);

            return $items;
        }

        /**
         * calcParity
         *
         * @param array $items
         *
         * @return int parity
         */
        protected function calcParity($items)
        {
            $parity = 0;
            foreach ($items as $item) {
                if ($item['mode'] != QR_MODE_ST) {
                    for ($i = $item['size'] - 1; $i >= 0; --$i) {
                        $parity ^= $item['data'][$i];
                    }
                }
            }

            return $parity;
        }

        /**
         * checkModeNum
         *
         * @param int   $size
         * @param array $data
         *
         * @return boolean true or false
         */
        protected function checkModeNum($size, $data)
        {
            for ($i = 0; $i < $size; ++$i) {
                if ((ord($data[$i]) < ord('0')) OR (ord($data[$i]) > ord('9'))) {
                    return false;
                }
            }

            return true;
        }

        /**
         * estimateBitsModeNum
         *
         * @param int $size
         *
         * @return int number of bits
         */
        protected function estimateBitsModeNum($size)
        {
            $w    = (int)$size / 3;
            $bits = $w * 10;
            switch ($size - $w * 3) {
                case 1:
                {
                    $bits += 4;
                    break;
                }
                case 2:
                {
                    $bits += 7;
                    break;
                }
                default:
                    {
                    break;
                    }
            }

            return $bits;
        }

        /**
         * Look up the alphabet-numeric convesion table (see JIS X0510:2004, pp.19).
         *
         * @param int $c character value
         *
         * @return value
         */
        protected function lookAnTable($c)
        {
            return (($c > 127) ? -1 : $this->anTable[$c]);
        }

        /**
         * checkModeAn
         *
         * @param int   $size
         * @param array $data
         *
         * @return boolean true or false
         */
        protected function checkModeAn($size, $data)
        {
            for ($i = 0; $i < $size; ++$i) {
                if ($this->lookAnTable(ord($data[$i])) == -1) {
                    return false;
                }
            }

            return true;
        }

        /**
         * estimateBitsModeAn
         *
         * @param int $size
         *
         * @return int number of bits
         */
        protected function estimateBitsModeAn($size)
        {
            $w    = (int)($size / 2);
            $bits = $w * 11;
            if ($size & 1) {
                $bits += 6;
            }

            return $bits;
        }

        /**
         * estimateBitsMode8
         *
         * @param int $size
         *
         * @return int number of bits
         */
        protected function estimateBitsMode8($size)
        {
            return $size * 8;
        }

        /**
         * estimateBitsModeKanji
         *
         * @param int $size
         *
         * @return int number of bits
         */
        protected function estimateBitsModeKanji($size)
        {
            return (int)(($size / 2) * 13);
        }

        /**
         * checkModeKanji
         *
         * @param int   $size
         * @param array $data
         *
         * @return boolean true or false
         */
        protected function checkModeKanji($size, $data)
        {
            if ($size & 1) {
                return false;
            }
            for ($i = 0; $i < $size; $i += 2) {
                $val = (ord($data[$i]) << 8) | ord($data[$i + 1]);
                if (($val < 0x8140) OR (($val > 0x9ffc) AND ($val < 0xe040)) OR ($val > 0xebbf)) {
                    return false;
                }
            }

            return true;
        }

        /**
         * Validate the input data.
         *
         * @param int $mode encoding mode.
         * @param int $size size of data (byte).
         * @param     array data data to validate
         *
         * @return boolean true in case of valid data, false otherwise
         */
        protected function check($mode, $size, $data)
        {
            if ($size <= 0) {
                return false;
            }
            switch ($mode) {
                case QR_MODE_NM:
                {
                    return $this->checkModeNum($size, $data);
                }
                case QR_MODE_AN:
                {
                    return $this->checkModeAn($size, $data);
                }
                case QR_MODE_KJ:
                {
                    return $this->checkModeKanji($size, $data);
                }
                case QR_MODE_8B:
                {
                    return true;
                }
                case QR_MODE_ST:
                {
                    return true;
                }
                default:
                    {
                    break;
                    }
            }

            return false;
        }

        /**
         * estimateBitStreamSize
         *
         * @param array $items
         * @param int   $version
         *
         * @return int bits
         */
        protected function estimateBitStreamSize($items, $version)
        {
            $bits = 0;
            if ($version == 0) {
                $version = 1;
            }
            foreach ($items as $item) {
                switch ($item['mode']) {
                    case QR_MODE_NM:
                    {
                        $bits = $this->estimateBitsModeNum($item['size']);
                        break;
                    }
                    case QR_MODE_AN:
                    {
                        $bits = $this->estimateBitsModeAn($item['size']);
                        break;
                    }
                    case QR_MODE_8B:
                    {
                        $bits = $this->estimateBitsMode8($item['size']);
                        break;
                    }
                    case QR_MODE_KJ:
                    {
                        $bits = $this->estimateBitsModeKanji($item['size']);
                        break;
                    }
                    case QR_MODE_ST:
                    {
                        return STRUCTURE_HEADER_BITS;
                    }
                    default:
                        {
                        return 0;
                        }
                }
                $l   = $this->lengthIndicator($item['mode'], $version);
                $m   = 1 << $l;
                $num = (int)(($item['size'] + $m - 1) / $m);
                $bits += $num * (4 + $l);
            }

            return $bits;
        }

        /**
         * estimateVersion
         *
         * @param array $items
         *
         * @return int version
         */
        protected function estimateVersion($items)
        {
            $version = 0;
            $prev    = 0;
            do {
                $prev    = $version;
                $bits    = $this->estimateBitStreamSize($items, $prev);
                $version = $this->getMinimumVersion((int)(($bits + 7) / 8), $this->level);
                if ($version < 0) {
                    return -1;
                }
            } while ($version > $prev);

            return $version;
        }

        /**
         * lengthOfCode
         *
         * @param int $mode
         * @param int $version
         * @param int $bits
         *
         * @return int size
         */
        protected function lengthOfCode($mode, $version, $bits)
        {
            $payload = $bits - 4 - $this->lengthIndicator($mode, $version);
            switch ($mode) {
                case QR_MODE_NM:
                {
                    $chunks = (int)($payload / 10);
                    $remain = $payload - $chunks * 10;
                    $size   = $chunks * 3;
                    if ($remain >= 7) {
                        $size += 2;
                    } elseif ($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_8B:
                {
                    $size = (int)($payload / 8);
                    break;
                }
                case QR_MODE_KJ:
                {
                    $size = (int)(($payload / 13) * 2);
                    break;
                }
                case QR_MODE_ST:
                {
                    $size = (int)($payload / 8);
                    break;
                }
                default:
                    {
                    $size = 0;
                    break;
                    }
            }
            $maxsize = $this->maximumWords($mode, $version);
            if ($size < 0) {
                $size = 0;
            }
            if ($size > $maxsize) {
                $size = $maxsize;
            }

            return $size;
        }

        /**
         * createBitStream
         *
         * @param array $items
         *
         * @return array of items and total bits
         */
        protected function createBitStream($items)
        {
            $total = 0;
            foreach ($items as $key => $item) {
                $items[$key] = $this->encodeBitStream($item, $this->version);
                $bits        = count($items[$key]['bstream']);
                $total += $bits;
            }

            return array($items, $total);
        }

        /**
         * convertData
         *
         * @param array $items
         *
         * @return array items
         */
        protected function convertData($items)
        {
            $ver = $this->estimateVersion($items);
            if ($ver > $this->version) {
                $this->version = $ver;
            }
            for (; ;) {
                $cbs   = $this->createBitStream($items);
                $items = $cbs[0];
                $bits  = $cbs[1];
                if ($bits < 0) {
                    return -1;
                }
                $ver = $this->getMinimumVersion((int)(($bits + 7) / 8), $this->level);
                if ($ver < 0) {
                    return -1;
                } elseif ($ver > $this->version) {
                    $this->version = $ver;
                } else {
                    break;
                }
            }

            return $items;
        }

        /**
         * Append Padding Bit to bitstream
         *
         * @param array $bstream
         *
         * @return array bitstream
         */
        protected function appendPaddingBit($bstream)
        {
            $bits     = count($bstream);
            $maxwords = $this->getDataLength($this->version, $this->level);
            $maxbits  = $maxwords * 8;
            if ($maxbits == $bits) {
                return 0;
            }
            if ($maxbits - $bits < 5) {
                return $this->appendNum($bstream, $maxbits - $bits, 0);
            }
            $bits += 4;
            $words   = (int)(($bits + 7) / 8);
            $padding = array();
            $padding = $this->appendNum($padding, $words * 8 - $bits + 4, 0);
            $padlen  = $maxwords - $words;
            if ($padlen > 0) {
                $padbuf = array();
                for ($i = 0; $i < $padlen; ++$i) {
                    $padbuf[$i] = ($i & 1) ? 0x11 : 0xec;
                }
                $padding = $this->appendBytes($padding, $padlen, $padbuf);
            }

            return $this->appendBitstream($bstream, $padding);
        }

        /**
         * mergeBitStream
         *
         * @param array $bstream
         *
         * @return array bitstream
         */
        protected function mergeBitStream($items)
        {
            $items   = $this->convertData($items);
            $bstream = array();
            foreach ($items as $item) {
                $bstream = $this->appendBitstream($bstream, $item['bstream']);
            }

            return $bstream;
        }

        /**
         * Returns a stream of bits.
         *
         * @param int $items
         *
         * @return array padded merged byte stream
         */
        protected function getBitStream($items)
        {
            $bstream = $this->mergeBitStream($items);

            return $this->appendPaddingBit($bstream);
        }

        /**
         * Pack all bit streams padding bits into a byte array.
         *
         * @param int $items
         *
         * @return array padded merged byte stream
         */
        protected function getByteStream($items)
        {
            $bstream = $this->getBitStream($items);

            return $this->bitstreamToByte($bstream);
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // QRbitstream
        /**
         * Return an array with zeros
         *
         * @param int $setLength array size
         *
         * @return array
         */
        protected function allocate($setLength)
        {
            return array_fill(0, $setLength, 0);
        }

        /**
         * Return new bitstream from number
         *
         * @param int $bits number of bits
         * @param int $num  number
         *
         * @return array bitstream
         */
        protected function newFromNum($bits, $num)
        {
            $bstream = $this->allocate($bits);
            $mask    = 1 << ($bits - 1);
            for ($i = 0; $i < $bits; ++$i) {
                if ($num & $mask) {
                    $bstream[$i] = 1;
                } else {
                    $bstream[$i] = 0;
                }
                $mask = $mask >> 1;
            }

            return $bstream;
        }

        /**
         * Return new bitstream from bytes
         *
         * @param int   $size size
         * @param array $data bytes
         *
         * @return array bitstream
         */
        protected function newFromBytes($size, $data)
        {
            $bstream = $this->allocate($size * 8);
            $p       = 0;
            for ($i = 0; $i < $size; ++$i) {
                $mask = 0x80;
                for ($j = 0; $j < 8; ++$j) {
                    if ($data[$i] & $mask) {
                        $bstream[$p] = 1;
                    } else {
                        $bstream[$p] = 0;
                    }
                    $p++;
                    $mask = $mask >> 1;
                }
            }

            return $bstream;
        }

        /**
         * Append one bitstream to another
         *
         * @param array $bitstream original bitstream
         * @param array $append    bitstream to append
         *
         * @return array bitstream
         */
        protected function appendBitstream($bitstream, $append)
        {
            if ((!is_array($append)) OR (count($append) == 0)) {
                return $bitstream;
            }
            if (count($bitstream) == 0) {
                return $append;
            }

            return array_values(array_merge($bitstream, $append));
        }

        /**
         * Append one bitstream created from number to another
         *
         * @param array $bitstream original bitstream
         * @param int   $bits      number of bits
         * @param int   $num       number
         *
         * @return array bitstream
         */
        protected function appendNum($bitstream, $bits, $num)
        {
            if ($bits == 0) {
                return 0;
            }
            $b = $this->newFromNum($bits, $num);

            return $this->appendBitstream($bitstream, $b);
        }

        /**
         * Append one bitstream created from bytes to another
         *
         * @param array $bitstream original bitstream
         * @param int   $size      size
         * @param array $data      bytes
         *
         * @return array bitstream
         */
        protected function appendBytes($bitstream, $size, $data)
        {
            if ($size == 0) {
                return 0;
            }
            $b = $this->newFromBytes($size, $data);

            return $this->appendBitstream($bitstream, $b);
        }

        /**
         * Convert bitstream to bytes
         *
         * @param array $bitstream original bitstream
         *
         * @return array of bytes
         */
        protected function bitstreamToByte($bstream)
        {
            $size = count($bstream);
            if ($size == 0) {
                return array();
            }
            $data  = array_fill(0, (int)(($size + 7) / 8), 0);
            $bytes = (int)($size / 8);
            $p     = 0;
            for ($i = 0; $i < $bytes; $i++) {
                $v = 0;
                for ($j = 0; $j < 8; $j++) {
                    $v = $v << 1;
                    $v |= $bstream[$p];
                    $p++;
                }
                $data[$i] = $v;
            }
            if ($size & 7) {
                $v = 0;
                for ($j = 0; $j < ($size & 7); $j++) {
                    $v = $v << 1;
                    $v |= $bstream[$p];
                    $p++;
                }
                $data[$bytes] = $v;
            }

            return $data;
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // QRspec
        /**
         * Replace a value on the array at the specified position
         *
         * @param array  $srctab
         * @param int    $x       X position
         * @param int    $y       Y position
         * @param string $repl    value to replace
         * @param int    $replLen length of the repl string
         *
         * @return array srctab
         */
        protected function qrstrset($srctab, $x, $y, $repl, $replLen = false)
        {
            $srctab[$y] = substr_replace($srctab[$y], ($replLen !== false) ? substr($repl, 0, $replLen) : $repl, $x, ($replLen !== false) ? $replLen : strlen($repl));

            return $srctab;
        }

        /**
         * Return maximum data code length (bytes) for the version.
         *
         * @param int $version version
         * @param int $level   error correction level
         *
         * @return int maximum size (bytes)
         */
        protected function getDataLength($version, $level)
        {
            return $this->capacity[$version][QRCAP_WORDS] - $this->capacity[$version][QRCAP_EC][$level];
        }

        /**
         * Return maximum error correction code length (bytes) for the version.
         *
         * @param int $version version
         * @param int $level   error correction level
         *
         * @return int ECC size (bytes)
         */
        protected function getECCLength($version, $level)
        {
            return $this->capacity[$version][QRCAP_EC][$level];
        }

        /**
         * Return the width of the symbol for the version.
         *
         * @param int $version version
         *
         * @return int width
         */
        protected function getWidth($version)
        {
            return $this->capacity[$version][QRCAP_WIDTH];
        }

        /**
         * Return the numer of remainder bits.
         *
         * @param int $version version
         *
         * @return int number of remainder bits
         */
        protected function getRemainder($version)
        {
            return $this->capacity[$version][QRCAP_REMINDER];
        }

        /**
         * Return a version number that satisfies the input code length.
         *
         * @param int $size  input code length (byte)
         * @param int $level error correction level
         *
         * @return int version number
         */
        protected function getMinimumVersion($size, $level)
        {
            for ($i = 1; $i <= QRSPEC_VERSION_MAX; ++$i) {
                $words = $this->capacity[$i][QRCAP_WORDS] - $this->capacity[$i][QRCAP_EC][$level];
                if ($words >= $size) {
                    return $i;
                }
            }

            return -1;
        }

        /**
         * Return the size of length indicator for the mode and version.
         *
         * @param int $mode    encoding mode
         * @param int $version version
         *
         * @return int the size of the appropriate length indicator (bits).
         */
        protected function lengthIndicator($mode, $version)
        {
            if ($mode == QR_MODE_ST) {
                return 0;
            }
            if ($version <= 9) {
                $l = 0;
            } elseif ($version <= 26) {
                $l = 1;
            } else {
                $l = 2;
            }

            return $this->lengthTableBits[$mode][$l];
        }

        /**
         * Return the maximum length for the mode and version.
         *
         * @param int $mode    encoding mode
         * @param int $version version
         *
         * @return int the maximum length (bytes)
         */
        protected function maximumWords($mode, $version)
        {
            if ($mode == QR_MODE_ST) {
                return 3;
            }
            if ($version <= 9) {
                $l = 0;
            } else if ($version <= 26) {
                $l = 1;
            } else {
                $l = 2;
            }
            $bits  = $this->lengthTableBits[$mode][$l];
            $words = (1 << $bits) - 1;
            if ($mode == QR_MODE_KJ) {
                $words *= 2; // the number of bytes is required
            }

            return $words;
        }

        /**
         * Return an array of ECC specification.
         *
         * @param int   $version version
         * @param int   $level   error correction level
         * @param array $spec    an array of ECC specification contains as following: {# of type1 blocks, # of data code, # of ecc code, # of type2 blocks, # of data code}
         *
         * @return array spec
         */
        protected function getEccSpec($version, $level, $spec)
        {
            if (count($spec) < 5) {
                $spec = array(0, 0, 0, 0, 0);
            }
            $b1   = $this->eccTable[$version][$level][0];
            $b2   = $this->eccTable[$version][$level][1];
            $data = $this->getDataLength($version, $level);
            $ecc  = $this->getECCLength($version, $level);
            if ($b2 == 0) {
                $spec[0] = $b1;
                $spec[1] = (int)($data / $b1);
                $spec[2] = (int)($ecc / $b1);
                $spec[3] = 0;
                $spec[4] = 0;
            } else {
                $spec[0] = $b1;
                $spec[1] = (int)($data / ($b1 + $b2));
                $spec[2] = (int)($ecc / ($b1 + $b2));
                $spec[3] = $b2;
                $spec[4] = $spec[1] + 1;
            }

            return $spec;
        }

        /**
         * Put an alignment marker.
         *
         * @param array $frame frame
         * @param int   $width width
         * @param int   $ox    X center coordinate of the pattern
         * @param int   $oy    Y center coordinate of the pattern
         *
         * @return array frame
         */
        protected function putAlignmentMarker($frame, $ox, $oy)
        {
            $finder = array(
                "\xa1\xa1\xa1\xa1\xa1",
                "\xa1\xa0\xa0\xa0\xa1",
                "\xa1\xa0\xa1\xa0\xa1",
                "\xa1\xa0\xa0\xa0\xa1",
                "\xa1\xa1\xa1\xa1\xa1"
            );
            $yStart = $oy - 2;
            $xStart = $ox - 2;
            for ($y = 0; $y < 5; $y++) {
                $frame = $this->qrstrset($frame, $xStart, $yStart + $y, $finder[$y]);
            }

            return $frame;
        }

        /**
         * Put an alignment pattern.
         *
         * @param int   $version version
         * @param array $fram    frame
         * @param int   $width   width
         *
         * @return array frame
         */
        protected function putAlignmentPattern($version, $frame, $width)
        {
            if ($version < 2) {
                return $frame;
            }
            $d = $this->alignmentPattern[$version][1] - $this->alignmentPattern[$version][0];
            if ($d < 0) {
                $w = 2;
            } else {
                $w = (int)(($width - $this->alignmentPattern[$version][0]) / $d + 2);
            }
            if ($w * $w - 3 == 1) {
                $x     = $this->alignmentPattern[$version][0];
                $y     = $this->alignmentPattern[$version][0];
                $frame = $this->putAlignmentMarker($frame, $x, $y);

                return $frame;
            }
            $cx = $this->alignmentPattern[$version][0];
            $wo = $w - 1;
            for ($x = 1; $x < $wo; ++$x) {
                $frame = $this->putAlignmentMarker($frame, 6, $cx);
                $frame = $this->putAlignmentMarker($frame, $cx, 6);
                $cx += $d;
            }
            $cy = $this->alignmentPattern[$version][0];
            for ($y = 0; $y < $wo; ++$y) {
                $cx = $this->alignmentPattern[$version][0];
                for ($x = 0; $x < $wo; ++$x) {
                    $frame = $this->putAlignmentMarker($frame, $cx, $cy);
                    $cx += $d;
                }
                $cy += $d;
            }

            return $frame;
        }

        /**
         * Return BCH encoded version information pattern that is used for the symbol of version 7 or greater. Use lower 18 bits.
         *
         * @param int $version version
         *
         * @return BCH encoded version information pattern
         */
        protected function getVersionPattern($version)
        {
            if (($version < 7) OR ($version > QRSPEC_VERSION_MAX)) {
                return 0;
            }

            return $this->versionPattern[($version - 7)];
        }

        /**
         * Return BCH encoded format information pattern.
         *
         * @param array $mask
         * @param int   $level error correction level
         *
         * @return BCH encoded format information pattern
         */
        protected function getFormatInfo($mask, $level)
        {
            if (($mask < 0) OR ($mask > 7)) {
                return 0;
            }
            if (($level < 0) OR ($level > 3)) {
                return 0;
            }

            return $this->formatInfo[$level][$mask];
        }

        /**
         * Put a finder pattern.
         *
         * @param array $frame frame
         * @param int   $width width
         * @param int   $ox    X center coordinate of the pattern
         * @param int   $oy    Y center coordinate of the pattern
         *
         * @return array frame
         */
        protected function putFinderPattern($frame, $ox, $oy)
        {
            $finder = array(
                "\xc1\xc1\xc1\xc1\xc1\xc1\xc1",
                "\xc1\xc0\xc0\xc0\xc0\xc0\xc1",
                "\xc1\xc0\xc1\xc1\xc1\xc0\xc1",
                "\xc1\xc0\xc1\xc1\xc1\xc0\xc1",
                "\xc1\xc0\xc1\xc1\xc1\xc0\xc1",
                "\xc1\xc0\xc0\xc0\xc0\xc0\xc1",
                "\xc1\xc1\xc1\xc1\xc1\xc1\xc1"
            );
            for ($y = 0; $y < 7; $y++) {
                $frame = $this->qrstrset($frame, $ox, ($oy + $y), $finder[$y]);
            }

            return $frame;
        }

        /**
         * Return a copy of initialized frame.
         *
         * @param int $version version
         *
         * @return Array of unsigned char.
         */
        protected function createFrame($version)
        {
            $width     = $this->capacity[$version][QRCAP_WIDTH];
            $frameLine = str_repeat("\0", $width);
            $frame     = array_fill(0, $width, $frameLine);
            // Finder pattern
            $frame = $this->putFinderPattern($frame, 0, 0);
            $frame = $this->putFinderPattern($frame, $width - 7, 0);
            $frame = $this->putFinderPattern($frame, 0, $width - 7);
            // Separator
            $yOffset = $width - 7;
            for ($y = 0; $y < 7; ++$y) {
                $frame[$y][7]          = "\xc0";
                $frame[$y][$width - 8] = "\xc0";
                $frame[$yOffset][7]    = "\xc0";
                ++$yOffset;
            }
            $setPattern = str_repeat("\xc0", 8);
            $frame      = $this->qrstrset($frame, 0, 7, $setPattern);
            $frame      = $this->qrstrset($frame, $width - 8, 7, $setPattern);
            $frame      = $this->qrstrset($frame, 0, $width - 8, $setPattern);
            // Format info
            $setPattern = str_repeat("\x84", 9);
            $frame      = $this->qrstrset($frame, 0, 8, $setPattern);
            $frame      = $this->qrstrset($frame, $width - 8, 8, $setPattern, 8);
            $yOffset    = $width - 8;
            for ($y = 0; $y < 8; ++$y, ++$yOffset) {
                $frame[$y][8]       = "\x84";
                $frame[$yOffset][8] = "\x84";
            }
            // Timing pattern
            $wo = $width - 15;
            for ($i = 1; $i < $wo; ++$i) {
                $frame[6][7 + $i] = chr(0x90 | ($i & 1));
                $frame[7 + $i][6] = chr(0x90 | ($i & 1));
            }
            // Alignment pattern
            $frame = $this->putAlignmentPattern($version, $frame, $width);
            // Version information
            if ($version >= 7) {
                $vinf = $this->getVersionPattern($version);
                $v    = $vinf;
                for ($x = 0; $x < 6; ++$x) {
                    for ($y = 0; $y < 3; ++$y) {
                        $frame[($width - 11) + $y][$x] = chr(0x88 | ($v & 1));
                        $v                             = $v >> 1;
                    }
                }
                $v = $vinf;
                for ($y = 0; $y < 6; ++$y) {
                    for ($x = 0; $x < 3; ++$x) {
                        $frame[$y][$x + ($width - 11)] = chr(0x88 | ($v & 1));
                        $v                             = $v >> 1;
                    }
                }
            }
            // and a little bit...
            $frame[$width - 8][8] = "\x81";

            return $frame;
        }

        /**
         * Set new frame for the specified version.
         *
         * @param int $version version
         *
         * @return Array of unsigned char.
         */
        protected function newFrame($version)
        {
            if (($version < 1) OR ($version > QRSPEC_VERSION_MAX)) {
                return NULL;
            }
            if (!isset($this->frames[$version])) {
                $this->frames[$version] = $this->createFrame($version);
            }
            if (is_null($this->frames[$version])) {
                return NULL;
            }

            return $this->frames[$version];
        }

        /**
         * Return block number 0
         *
         * @param array $spec
         *
         * @return int value
         */
        protected function rsBlockNum($spec)
        {
            return ($spec[0] + $spec[3]);
        }

        /**
         * Return block number 1
         *
         * @param array $spec
         *
         * @return int value
         */
        protected function rsBlockNum1($spec)
        {
            return $spec[0];
        }

        /**
         * Return data codes 1
         *
         * @param array $spec
         *
         * @return int value
         */
        protected function rsDataCodes1($spec)
        {
            return $spec[1];
        }

        /**
         * Return ecc codes 1
         *
         * @param array $spec
         *
         * @return int value
         */
        protected function rsEccCodes1($spec)
        {
            return $spec[2];
        }

        /**
         * Return block number 2
         *
         * @param array $spec
         *
         * @return int value
         */
        protected function rsBlockNum2($spec)
        {
            return $spec[3];
        }

        /**
         * Return data codes 2
         *
         * @param array $spec
         *
         * @return int value
         */
        protected function rsDataCodes2($spec)
        {
            return $spec[4];
        }

        /**
         * Return ecc codes 2
         *
         * @param array $spec
         *
         * @return int value
         */
        protected function rsEccCodes2($spec)
        {
            return $spec[2];
        }

        /**
         * Return data length
         *
         * @param array $spec
         *
         * @return int value
         */
        protected function rsDataLength($spec)
        {
            return ($spec[0] * $spec[1]) + ($spec[3] * $spec[4]);
        }

        /**
         * Return ecc length
         *
         * @param array $spec
         *
         * @return int value
         */
        protected function rsEccLength($spec)
        {
            return ($spec[0] + $spec[3]) * $spec[2];
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // QRrs
        /**
         * Initialize a Reed-Solomon codec and add it to existing rsitems
         *
         * @param int $symsize symbol size, bits
         * @param int $gfpoly  Field generator polynomial coefficients
         * @param int $fcr     first root of RS code generator polynomial, index form
         * @param int $prim    primitive element to generate polynomial roots
         * @param int $nroots  RS code generator polynomial degree (number of roots)
         * @param int $pad     padding bytes at front of shortened block
         *
         * @return array Array of RS values:<ul><li>mm = Bits per symbol;</li><li>nn = Symbols per block;</li><li>alpha_to = log lookup table array;</li><li>index_of = Antilog lookup table array;</li><li>genpoly = Generator polynomial array;</li><li>nroots = Number of generator;</li><li>roots = number of parity symbols;</li><li>fcr = First consecutive root, index form;</li><li>prim = Primitive element, index form;</li><li>iprim = prim-th root of 1, index form;</li><li>pad = Padding bytes in shortened block;</li><li>gfpoly</ul>.
         */
        protected function init_rs($symsize, $gfpoly, $fcr, $prim, $nroots, $pad)
        {
            foreach ($this->rsitems as $rs) {
                if (($rs['pad'] != $pad) OR ($rs['nroots'] != $nroots) OR ($rs['mm'] != $symsize)
                    OR ($rs['gfpoly'] != $gfpoly) OR ($rs['fcr'] != $fcr) OR ($rs['prim'] != $prim)
                ) {
                    continue;
                }

                return $rs;
            }
            $rs = $this->init_rs_char($symsize, $gfpoly, $fcr, $prim, $nroots, $pad);
            array_unshift($this->rsitems, $rs);

            return $rs;
        }

        // - - - - - - - - - - - - - - - - - - - - - - - - -
        // QRrsItem
        /**
         * modnn
         *
         * @param     array RS values
         * @param int $x    X position
         *
         * @return int X osition
         */
        protected function modnn($rs, $x)
        {
            while ($x >= $rs['nn']) {
                $x -= $rs['nn'];
                $x = ($x >> $rs['mm']) + ($x & $rs['nn']);
            }

            return $x;
        }

        /**
         * Initialize a Reed-Solomon codec and returns an array of values.
         *
         * @param int $symsize symbol size, bits
         * @param int $gfpoly  Field generator polynomial coefficients
         * @param int $fcr     first root of RS code generator polynomial, index form
         * @param int $prim    primitive element to generate polynomial roots
         * @param int $nroots  RS code generator polynomial degree (number of roots)
         * @param int $pad     padding bytes at front of shortened block
         *
         * @return array Array of RS values:<ul><li>mm = Bits per symbol;</li><li>nn = Symbols per block;</li><li>alpha_to = log lookup table array;</li><li>index_of = Antilog lookup table array;</li><li>genpoly = Generator polynomial array;</li><li>nroots = Number of generator;</li><li>roots = number of parity symbols;</li><li>fcr = First consecutive root, index form;</li><li>prim = Primitive element, index form;</li><li>iprim = prim-th root of 1, index form;</li><li>pad = Padding bytes in shortened block;</li><li>gfpoly</ul>.
         */
        protected function init_rs_char($symsize, $gfpoly, $fcr, $prim, $nroots, $pad)
        {
            // Based on Reed solomon encoder by Phil Karn, KA9Q (GNU-LGPLv2)
            $rs = null;
            // Check parameter ranges
            if (($symsize < 0) OR ($symsize > 8)) {
                return $rs;
            }
            if (($fcr < 0) OR ($fcr >= (1 << $symsize))) {
                return $rs;
            }
            if (($prim <= 0) OR ($prim >= (1 << $symsize))) {
                return $rs;
            }
            if (($nroots < 0) OR ($nroots >= (1 << $symsize))) {
                return $rs;
            }
            if (($pad < 0) OR ($pad >= ((1 << $symsize) - 1 - $nroots))) {
                return $rs;
            }
            $rs             = array();
            $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!
                return NULL;
            }
            // 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] ^ $rs['alpha_to'][$this->modnn($rs, $rs['index_of'][$rs['genpoly'][$j]] + $root)];
                    } else {
                        $rs['genpoly'][$j] = $rs['genpoly'][$j - 1];
                    }
                }
                // rs->genpoly[0] can never be zero
                $rs['genpoly'][0] = $rs['alpha_to'][$this->modnn($rs, $rs['index_of'][$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;
        }

        /**
         * Encode a Reed-Solomon codec and returns the parity array
         *
         * @param array $rs     RS values
         * @param array $data   data
         * @param array $parity parity
         *
         * @return parity array
         */
        protected function encode_rs_char($rs, $data, $parity)
        {
            $MM       =& $rs['mm']; // bits per symbol
            $NN       =& $rs['nn']; // the total number of symbols in a RS block
            $ALPHA_TO =& $rs['alpha_to']; // the address of an array of NN elements to convert Galois field elements in index (log) form to polynomial form
            $INDEX_OF =& $rs['index_of']; // the address of an array of NN elements to convert Galois field elements in polynomial form to index (log) form
            $GENPOLY  =& $rs['genpoly']; // an array of NROOTS+1 elements containing the generator polynomial in index form
            $NROOTS   =& $rs['nroots']; // the number of roots in the RS code generator polynomial, which is the same as the number of parity symbols in a block
            $FCR      =& $rs['fcr']; // first consecutive root, index form
            $PRIM     =& $rs['prim']; // primitive element, index form
            $IPRIM    =& $rs['iprim']; // prim-th root of 1, index form
            $PAD      =& $rs['pad']; // the number of pad symbols in a block
            $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 = $this->modnn($rs, $NN - $GENPOLY[$NROOTS] + $feedback);
                    for ($j = 1; $j < $NROOTS; ++$j) {
                        $parity[$j] ^= $ALPHA_TO[$this->modnn($rs, $feedback + $GENPOLY[($NROOTS - $j)])];
                    }
                }
                // Shift
                array_shift($parity);
                if ($feedback != $A0) {
                    array_push($parity, $ALPHA_TO[$this->modnn($rs, $feedback + $GENPOLY[0])]);
                } else {
                    array_push($parity, 0);
                }
            }

            return $parity;
        }

    } // end QRcode class
} // END OF "class_exists QRcode"
?>
