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<?php
//============================================================+
// File name   : qrcode.php
// Version     : 1.0.010
// Begin       : 2010-03-22
// Last Update : 2012-07-25
// Author      : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com
// License     : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html)
// -------------------------------------------------------------------
// Copyright (C) 2010-2012 Nicola Asuni - Tecnick.com LTD
//
// This file is part of TCPDF software library.
//
// TCPDF 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 (at your option) any later version.
//
// TCPDF 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 TCPDF.  If not, see <http://www.gnu.org/licenses/>.
//
// See LICENSE.TXT file for more information.
// -------------------------------------------------------------------
//
// 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
// ---------------------------------------------------------
//============================================================+

/**
 * @file
 * 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
 * @author Nicola Asuni
 * @version 1.0.010
 */

// 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

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

// for compatibility with PHP4
if (!function_exists('str_split')) {
        /**
         * Convert a string to an array (needed for PHP4 compatibility)
         * @param $string (string) The input string.
         * @param $split_length (int) Maximum length of the chunk.
         * @return  If the optional split_length  parameter is specified, the returned array will be broken down into chunks with each being split_length  in length, otherwise each chunk will be one character in length. FALSE is returned if split_length is less than 1. If the split_length length exceeds the length of string , the entire string is returned as the first (and only) array element.
         */
        function str_split($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 QRcode
 * 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
 * @author Nicola Asuni
 * @version 1.0.010
 */
class QRcode {

        /**
         * Barcode array to be returned which is readable by TCPDF.
         * @protected
         */
        protected $barcode_array = array();

        /**
         * 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.
         * @protected
         */
        protected $version = 0;

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

        /**
         * Encoding mode.
         * @protected
         */
        protected $hint = QR_MODE_8B;

        /**
         * Boolean flag, if true the input string will be converted to uppercase.
         * @protected
         */
        protected $casesensitive = true;

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

        /**
         * Mask data.
         * @protected
         */
        protected $data;

        // FrameFiller

        /**
         * Width.
         * @protected
         */
        protected $width;

        /**
         * Frame.
         * @protected
         */
        protected $frame;

        /**
         * X position of bit.
         * @protected
         */
        protected $x;

        /**
         * Y position of bit.
         * @protected
         */
        protected $y;

        /**
         * Direction.
         * @protected
         */
        protected $dir;

        /**
         * Single bit value.
         * @protected
         */
        protected $bit;

        // ---- QRrawcode ----

        /**
         * Data code.
         * @protected
         */
        protected $datacode = array();

        /**
         * Error correction code.
         * @protected
         */
        protected $ecccode = array();

        /**
         * Blocks.
         * @protected
         */
        protected $blocks;

        /**
         * Reed-Solomon blocks.
         * @protected
         */
        protected $rsblocks = array(); //of RSblock

        /**
         * Counter.
         * @protected
         */
        protected $count;

        /**
         * Data length.
         * @protected
         */
        protected $dataLength;

        /**
         * Error correction length.
         * @protected
         */
        protected $eccLength;

        /**
         * Value b1.
         * @protected
         */
        protected $b1;

        // ---- QRmask ----

        /**
         * Run length.
         * @protected
         */
        protected $runLength = array();

        // ---- QRsplit ----

        /**
         * Input data string.
         * @protected
         */
        protected $dataStr = '';

        /**
         * Input items.
         * @protected
         */
        protected $items;

        // Reed-Solomon items

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

        /**
         * Array of frames.
         * @protected
         */
        protected $frames = array();

        /**
         * Alphabet-numeric convesion table.
         * @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  //
                );

        /**
         * Array Table of the capacity of symbols.
         * See Table 1 (pp.13) and Table 12-16 (pp.30-36), JIS X0510:2004.
         * @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
        );

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

        /**
         * Array Table of the error correction code (Reed-Solomon block).
         * See Table 12-16 (pp.30-36), JIS X0510:2004.
         * @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
        );

        /**
         * 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.
         * @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
        );

        /**
         * Array Version information pattern (BCH coded).
         * See Table 1 in Appendix D (pp.68) of JIS X0510:2004.
         * size: [QRSPEC_VERSION_MAX - 6]
         * @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
        );

        /**
         * Array Format information
         * @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 $code (string) code to represent using QRcode
         * @param $eclevel (string) error level: <ul><li>L : About 7% or less errors can be corrected.</li><li>M : About 15% or less errors can be corrected.</li><li>Q : About 25% or less errors can be corrected.</li><li>H : About 30% or less errors can be corrected.</li></ul>
         * @public
         * @since 1.0.000
         */
        public function __construct($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);
                if (is_null($this->data)) {
                        return false;
                }
                $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;
         * @public
         */
        public function getBarcodeArray() {
                return $this->barcode_array;
        }

        /**
         * Convert the frame in binary form
         * @param $frame (array) array to binarize
         * @return array frame in binary form
         */
        protected function binarize($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 $mask (int) masking mode
         */
        protected function encodeMask($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 $at (array) x,y position
         * @param $val (int) value of the character to set
         */
        protected function setFrameAt($at, $val) {
                $this->frame[$at['y']][$at['x']] = chr($val);
        }

        /**
         * Get frame value at specified position
         * @param $at (array) x,y position
         * @return value at specified position
         */
        protected function getFrameAt($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 $spec (array) array of ECC specification
         * @return 0 in case of success, -1 in case of error
         */
        protected function init($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 $width (int) frame width
         * @param $frame (array) frame
         * @param $mask (array) masking mode
         * @param $level (int) error correction level
         * @return int blacks
         */
         protected function writeFormatInformation($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 $x (int) X position
         * @param $y (int) Y position
         * @return int mask
         */
         protected function mask0($x, $y) {
                return ($x + $y) & 1;
        }

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

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

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

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

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

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

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

        /**
         * Return bitmask
         * @param $maskNo (int) mask number
         * @param $width (int) width
         * @param $frame (array) frame
         * @return array bitmask
         */
        protected function generateMaskNo($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 $maskNo (int)
         * @param $width (int)
         * @param $s (int)
         * @param $d (int)
         * @param $maskGenOnly (boolean)
         * @return int b
         */
         protected function makeMaskNo($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 $width (int)
         * @param $frame (array)
         * @param $maskNo (int)
         * @param $level (int)
         * @return array mask
         */
         protected function makeMask($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 $length (int)
         * @return int demerit
         */
         protected function calcN1N3($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 $width (int)
         * @param $frame (array)
         * @return int demerit
         */
         protected function evaluateSymbol($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 $width (int)
         * @param $frame (array)
         * @param $level (int)
         * @return array best mask
         */
         protected function mask($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 $str (string) string
         * @param $pos (int) characted position
         * @return boolean true of false
         */
         protected function isdigitat($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 $str (string) string
         * @param $pos (int) characted position
         * @return boolean true of false
         */
         protected function isalnumat($str, $pos) {
                if ($pos >= strlen($str)) {
                        return false;
                }
                return ($this->lookAnTable(ord($str[$pos])) >= 0);
        }

        /**
         * identifyMode
         * @param $pos (int)
         * @return int mode
         */
         protected function identifyMode($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);
                $p =1 ;
                while($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
         * @return (int)
         */
         protected function splitString() {
                while (strlen($this->dataStr) > 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);
                }
                return 0;
        }

        /**
         * 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 $mode (int)
         * @param $size (int)
         * @param $data (array)
         * @param $bstream (array)
         * @return array input item
         */
         protected function newInputItem($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 $inputitem (array)
         * @param $version (int)
         * @return array input item
         */
         protected function encodeModeNum($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 $inputitem (array)
         * @param $version (int)
         * @return array input item
         */
         protected function encodeModeAn($inputitem, $version) {
                $words = (int)($inputitem['size'] / 2);
                $inputitem['bstream'] = array();
                $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], 4, 0x02);
                $inputitem['bstream'] = $this->appendNum($inputitem['bstream'], $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 $inputitem (array)
         * @param $version (int)
         * @return array input item
         */
         protected function encodeMode8($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 $inputitem (array)
         * @param $version (int)
         * @return array input item
         */
         protected function encodeModeKanji($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 $inputitem (array)
         * @return array input item
         */
         protected function encodeModeStructure($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 $inputitem (array)
         * @param $version (int)
         * @return array input item
         */
         protected function encodeBitStream($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 $items (arrray) input items
         * @param $mode (int) encoding mode.
         * @param $size (int) size of data (byte).
         * @param $data (array) array of input data.
         * @return items
         *
         */
        protected function appendNewInputItem($items, $mode, $size, $data) {
                $newitem = $this->newInputItem($mode, $size, $data);
                if (!empty($newitem)) {
                        $items[] = $newitem;
                }
                return $items;
        }

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

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

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

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

        /**
         * estimateBitsModeAn
         * @param $size (int)
         * @return int number of bits
         */
         protected function estimateBitsModeAn($size) {
                $bits = (int)($size * 5.5); // (size / 2 ) * 11
                if ($size & 1) {
                        $bits += 6;
                }
                return $bits;
        }

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

        /**
         * estimateBitsModeKanji
         * @param $size (int)
         * @return int number of bits
         */
         protected function estimateBitsModeKanji($size) {
                return (int)($size * 6.5); // (size / 2 ) * 13
        }

        /**
         * checkModeKanji
         * @param $size (int)
         * @param $data (array)
         * @return boolean true or false
         */
         protected function checkModeKanji($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 $mode (int) encoding mode.
         * @param $size (int) size of data (byte).
         * @param $data (array) data to validate
         * @return boolean true in case of valid data, false otherwise
         */
        protected function check($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 $items (array)
         * @param $version (int)
         * @return int bits
         */
         protected function estimateBitStreamSize($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 $items (array)
         * @return int version
         */
         protected function estimateVersion($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 $mode (int)
         * @param $version (int)
         * @param $bits (int)
         * @return int size
         */
         protected function lengthOfCode($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 $items (array)
         * @return array of items and total bits
         */
         protected function createBitStream($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 $items (array)
         * @return array items
         */
         protected function convertData($items) {
                $ver = $this->estimateVersion($items);
                if ($ver > $this->version) {
                        $this->version = $ver;
                }
                while (true) {
                        $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 $bstream (array)
         * @return array bitstream
         */
         protected function appendPaddingBit($bstream) {
                if (is_null($bstream)) {
                        return null;
                }
                $bits = count($bstream);
                $maxwords = $this->getDataLength($this->version, $this->level);
                $maxbits = $maxwords * 8;
                if ($maxbits == $bits) {
                        return $bstream;
                }
                if ($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 $items (array) items
         * @return array bitstream
         */
         protected function mergeBitStream($items) {
                $items = $this->convertData($items);
                if (!is_array($items)) {
                        return null;
                }
                $bstream = array();
                foreach ($items as $item) {
                        $bstream = $this->appendBitstream($bstream, $item['bstream']);
                }
                return $bstream;
        }

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

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

        // - - - - - - - - - - - - - - - - - - - - - - - - -

        // QRbitstream

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

        /**
         * Return new bitstream from number
         * @param $bits (int) number of bits
         * @param $num (int) number
         * @return array bitstream
         */
         protected function newFromNum($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 $size (int) size
         * @param $data (array) bytes
         * @return array bitstream
         */
         protected function newFromBytes($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 $bitstream (array) original bitstream
         * @param $append (array) bitstream to append
         * @return array bitstream
         */
         protected function appendBitstream($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 $bitstream (array) original bitstream
         * @param $bits (int) number of bits
         * @param $num (int) number
         * @return array bitstream
         */
         protected function appendNum($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 $bitstream (array) original bitstream
         * @param $size (int) size
         * @param $data (array) bytes
         * @return array bitstream
         */
         protected function appendBytes($bitstream, $size, $data) {
                if ($size == 0) {
                        return 0;
                }
                $b = $this->newFromBytes($size, $data);
                return $this->appendBitstream($bitstream, $b);
        }

        /**
         * Convert bitstream to bytes
         * @param $bstream (array) original bitstream
         * @return array of bytes
         */
         protected function bitstreamToByte($bstream) {
                if (is_null($bstream)) {
                        return null;
                }
                $size = count($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 $srctab (array)
         * @param $x (int) X position
         * @param $y (int) Y position
         * @param $repl (string) value to replace
         * @param $replLen (int) length of the repl string
         * @return array srctab
         */
         protected function qrstrset($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 $version (int) version
         * @param $level (int) error correction level
         * @return int maximum size (bytes)
         */
        protected function getDataLength($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 $version (int) version
         * @param $level (int) error correction level
         * @return int ECC size (bytes)
         */
        protected function getECCLength($version, $level){
                return $this->capacity[$version][QRCAP_EC][$level];
        }

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

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

        /**
         * Return a version number that satisfies the input code length.
         * @param $size (int) input code length (bytes)
         * @param $level (int) error correction level
         * @return int version number
         */
        protected function getMinimumVersion($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;
                        }
                }
                // the size of input data is greater than QR capacity, try to lover the error correction mode
                return -1;
        }

        /**
         * Return the size of length indicator for the mode and version.
         * @param $mode (int) encoding mode
         * @param $version (int) version
         * @return int the size of the appropriate length indicator (bits).
         */
        protected function lengthIndicator($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 $mode (int) encoding mode
         * @param $version (int) version
         * @return int the maximum length (bytes)
         */
        protected function maximumWords($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 $version (int) version
         * @param $level (int) error correction level
         * @param $spec (array) an array of ECC specification contains as following: {# of type1 blocks, # of data code, # of ecc code, # of type2 blocks, # of data code}
         * @return array spec
         */
        protected function getEccSpec($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 $frame (array) frame
         * @param $ox (int) X center coordinate of the pattern
         * @param $oy (int) Y center coordinate of the pattern
         * @return array frame
         */
        protected function putAlignmentMarker($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 $version (int) version
         * @param $frame (array) frame
         * @param $width (int) width
         * @return array frame
         */
         protected function putAlignmentPattern($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 $version (int) version
         * @return BCH encoded version information pattern
         */
        protected function getVersionPattern($version) {
                if (($version < 7) OR ($version > QRSPEC_VERSION_MAX)) {
                        return 0;
                }
                return $this->versionPattern[($version - 7)];
        }

        /**
         * Return BCH encoded format information pattern.
         * @param $mask (array)
         * @param $level (int) error correction level
         * @return BCH encoded format information pattern
         */
        protected function getFormatInfo($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 $frame (array) frame
         * @param $ox (int) X center coordinate of the pattern
         * @param $oy (int) Y center coordinate of the pattern
         * @return array frame
         */
        protected function putFinderPattern($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 $version (int) version
         * @return Array of unsigned char.
         */
        protected function createFrame($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 $version (int) version
         * @return Array of unsigned char.
         */
        protected function newFrame($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 $spec (array)
         * @return int value
         */
         protected function rsBlockNum($spec) {
                return ($spec[0] + $spec[3]);
        }

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

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

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

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

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

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

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

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

        // - - - - - - - - - - - - - - - - - - - - - - - - -

        // QRrs

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