<?php

/*

 * PHP QR Code encoder

 *

 * Input splitting classes

 *

 * Based on libqrencode C library distributed under LGPL 2.1

 * Copyright (C) 2006, 2007, 2008, 2009 Kentaro Fukuchi <fukuchi@megaui.net>

 *

 * PHP QR Code is distributed under LGPL 3

 * Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm>

 *

 * The following data / specifications are taken from

 * "Two dimensional symbol -- QR-code -- Basic Specification" (JIS X0510:2004)

 *  or

 * "Automatic identification and data capture techniques -- 

 *  QR Code 2005 bar code symbology specification" (ISO/IEC 18004:2006)

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 3 of the License, or any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

 */

    class QRsplit {



        public $dataStr = '';

        public $input;

        public $modeHint;



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

        public function __construct($dataStr, $input, $modeHint) 

        {

            $this->dataStr  = $dataStr;

            $this->input    = $input;

            $this->modeHint = $modeHint;

        }

        

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

        public static function isdigitat($str, $pos)

        {    

            if ($pos >= strlen($str))

                return false;

            

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

        }

        

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

        public static function isalnumat($str, $pos)

        {

            if ($pos >= strlen($str))

                return false;

                

            return (QRinput::lookAnTable(ord($str[$pos])) >= 0);

        }



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

        public function identifyMode($pos)

        {

            if ($pos >= strlen($this->dataStr)) 

                return QR_MODE_NUL;

                

            $c = $this->dataStr[$pos];

            

            if(self::isdigitat($this->dataStr, $pos)) {

                return QR_MODE_NUM;

            } else if(self::isalnumat($this->dataStr, $pos)) {

                return QR_MODE_AN;

            } else if($this->modeHint == QR_MODE_KANJI) {

            

                if ($pos+1 < strlen($this->dataStr)) 

                {

                    $d = $this->dataStr[$pos+1];

                    $word = (ord($c) << 8) | ord($d);

                    if(($word >= 0x8140 && $word <= 0x9ffc) || ($word >= 0xe040 && $word <= 0xebbf)) {

                        return QR_MODE_KANJI;

                    }

                }

            }



            return QR_MODE_8;

        } 

        

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

        public function eatNum()

        {

            $ln = QRspec::lengthIndicator(QR_MODE_NUM, $this->input->getVersion());



            $p = 0;

            while(self::isdigitat($this->dataStr, $p)) {

                $p++;

            }

            

            $run = $p;

            $mode = $this->identifyMode($p);

            

            if($mode == QR_MODE_8) {

                $dif = QRinput::estimateBitsModeNum($run) + 4 + $ln

                     + QRinput::estimateBitsMode8(1)         // + 4 + l8

                     - QRinput::estimateBitsMode8($run + 1); // - 4 - l8

                if($dif > 0) {

                    return $this->eat8();

                }

            }

            if($mode == QR_MODE_AN) {

                $dif = QRinput::estimateBitsModeNum($run) + 4 + $ln

                     + QRinput::estimateBitsModeAn(1)        // + 4 + la

                     - QRinput::estimateBitsModeAn($run + 1);// - 4 - la

                if($dif > 0) {

                    return $this->eatAn();

                }

            }

            

            $ret = $this->input->append(QR_MODE_NUM, $run, str_split($this->dataStr));

            if($ret < 0)

                return -1;



            return $run;

        }

        

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

        public function eatAn()

        {

            $la = QRspec::lengthIndicator(QR_MODE_AN,  $this->input->getVersion());

            $ln = QRspec::lengthIndicator(QR_MODE_NUM, $this->input->getVersion());



            $p = 0;

            

            while(self::isalnumat($this->dataStr, $p)) {

                if(self::isdigitat($this->dataStr, $p)) {

                    $q = $p;

                    while(self::isdigitat($this->dataStr, $q)) {

                        $q++;

                    }

                    

                    $dif = QRinput::estimateBitsModeAn($p) // + 4 + la

                         + QRinput::estimateBitsModeNum($q - $p) + 4 + $ln

                         - QRinput::estimateBitsModeAn($q); // - 4 - la

                         

                    if($dif < 0) {

                        break;

                    } else {

                        $p = $q;

                    }

                } else {

                    $p++;

                }

            }



            $run = $p;



            if(!self::isalnumat($this->dataStr, $p)) {

                $dif = QRinput::estimateBitsModeAn($run) + 4 + $la

                     + QRinput::estimateBitsMode8(1) // + 4 + l8

                      - QRinput::estimateBitsMode8($run + 1); // - 4 - l8

                if($dif > 0) {

                    return $this->eat8();

                }

            }



            $ret = $this->input->append(QR_MODE_AN, $run, str_split($this->dataStr));

            if($ret < 0)

                return -1;



            return $run;

        }

        

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

        public function eatKanji()

        {

            $p = 0;

            

            while($this->identifyMode($p) == QR_MODE_KANJI) {

                $p += 2;

            }

            

            $ret = $this->input->append(QR_MODE_KANJI, $p, str_split($this->dataStr));

            if($ret < 0)

                return -1;



            return $run;

        }



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

        public function eat8()

        {

            $la = QRspec::lengthIndicator(QR_MODE_AN, $this->input->getVersion());

            $ln = QRspec::lengthIndicator(QR_MODE_NUM, $this->input->getVersion());



            $p = 1;

            $dataStrLen = strlen($this->dataStr);

            

            while($p < $dataStrLen) {

                

                $mode = $this->identifyMode($p);

                if($mode == QR_MODE_KANJI) {

                    break;

                }

                if($mode == QR_MODE_NUM) {

                    $q = $p;

                    while(self::isdigitat($this->dataStr, $q)) {

                        $q++;

                    }

                    $dif = QRinput::estimateBitsMode8($p) // + 4 + l8

                         + QRinput::estimateBitsModeNum($q - $p) + 4 + $ln

                         - QRinput::estimateBitsMode8($q); // - 4 - l8

                    if($dif < 0) {

                        break;

                    } else {

                        $p = $q;

                    }

                } else if($mode == QR_MODE_AN) {

                    $q = $p;

                    while(self::isalnumat($this->dataStr, $q)) {

                        $q++;

                    }

                    $dif = QRinput::estimateBitsMode8($p)  // + 4 + l8

                         + QRinput::estimateBitsModeAn($q - $p) + 4 + $la

                         - QRinput::estimateBitsMode8($q); // - 4 - l8

                    if($dif < 0) {

                        break;

                    } else {

                        $p = $q;

                    }

                } else {

                    $p++;

                }

            }



            $run = $p;

            $ret = $this->input->append(QR_MODE_8, $run, str_split($this->dataStr));

            

            if($ret < 0)

                return -1;



            return $run;

        }



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

        public function splitString()

        {

            while (strlen($this->dataStr) > 0)

            {

                if($this->dataStr == '')

                    return 0;



                $mode = $this->identifyMode(0);

                

                switch ($mode) {

                    case QR_MODE_NUM: $length = $this->eatNum(); break;

                    case QR_MODE_AN:  $length = $this->eatAn(); break;

                    case QR_MODE_KANJI:

                        if ($hint == QR_MODE_KANJI)

                                $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);

            }

        }



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

        public function toUpper()

        {

            $stringLen = strlen($this->dataStr);

            $p = 0;

            

            while ($p<$stringLen) {

                $mode = self::identifyMode(substr($this->dataStr, $p), $this->modeHint);

                if($mode == QR_MODE_KANJI) {

                    $p += 2;

                } else {

                    if (ord($this->dataStr[$p]) >= ord('a') && ord($this->dataStr[$p]) <= ord('z')) {

                        $this->dataStr[$p] = chr(ord($this->dataStr[$p]) - 32);

                    }

                    $p++;

                }

            }



            return $this->dataStr;

        }



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

        public static function splitStringToQRinput($string, QRinput $input, $modeHint, $casesensitive = true)

        {

            if(is_null($string) || $string == '\0' || $string == '') {

                throw new Exception('empty string!!!');

            }



            $split = new QRsplit($string, $input, $modeHint);

            

            if(!$casesensitive)

                $split->toUpper();

                

            return $split->splitString();

        }

    }