<?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) 2010-2013 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
 */
 
	/** @addtogroup CoreGroup */
	/** @{ */
	
	/** Input stream splitter. */
    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();
        }
    }
	
	/** @} */