kc3-lang/libqrencode/split.c

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• Hash : 9015768b
  Author :
  Date : 2007-12-14T04:27:31
  

  * tests/test_qrencode.c:
    - New test has been added.
  * tests/view_qrcode.c:
    - Options supported.
    - Default mask is now -1 (auto).
  * Copyright 2007.
  

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• split.c

• /*
   * qrencode - QR Code encoder
   *
   * Input data splitter.
   * Copyright (C) 2006,2007 Kentaro Fukuchi <fukuchi@megaui.net>
   *
   * 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 2.1 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
   */
  
  #include "qrencode.h"
  #include "qrinput.h"
  #include "qrspec.h"
  #include "split.h"
  
  #define isdigit(__c__) ((unsigned char)((signed char)(__c__) - '0') < 10)
  #define isalnum(__c__) (QRinput_lookAnTable(__c__) >= 0)
  
  static int Split_eatNum(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive);
  static int Split_eatAn(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive);
  static int Split_eat8(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive);
  static int Split_eatKanji(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive);
  
  static int Split_eatNum(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive)
  {
  	const char *p;
  	int run;
  	int dif;
  	int ln;
  
  	ln = QRspec_lengthIndicator(QR_MODE_NUM, version);
  
  	p = string;
  	while(isdigit(*p)) {
  		p++;
  	}
  	run = p - string;
  	if(*p & 0x80) {
  		dif = QRinput_estimateBitsModeNum(run) + 4 + ln
  			+ QRinput_estimateBitsMode8(1) /* + 4 + l8 */
  			- QRinput_estimateBitsMode8(run + 1) /* - 4 - l8 */;
  		if(dif > 0) {
  			return Split_eat8(string, input, version, hint, casesensitive);
  		}
  	}
  	if(isalnum(*p) && !casesensitive) {
  		dif = QRinput_estimateBitsModeNum(run) + 4 + ln
  			+ QRinput_estimateBitsModeAn(1) /* + 4 + la */
  			- QRinput_estimateBitsModeAn(run + 1) /* - 4 - la */;
  		if(dif > 0) {
  			return Split_eatAn(string, input, version, hint, casesensitive);
  		}
  	}
  
  	QRinput_append(input, QR_MODE_NUM, run, (unsigned char *)string);
  	return run;
  }
  
  static int Split_eatAn(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive)
  {
  	const char *p, *q;
  	int run;
  	int dif;
  	int la, ln;
  
  	if(casesensitive) {
  		return Split_eat8(string, input, version, hint, casesensitive);
  	}
  
  	la = QRspec_lengthIndicator(QR_MODE_AN, version);
  	ln = QRspec_lengthIndicator(QR_MODE_NUM, version);
  
  	p = string;
  	while(isalnum(*p)) {
  		if(isdigit(*p)) {
  			q = p;
  			while(isdigit(*q)) {
  				q++;
  			}
  			dif = QRinput_estimateBitsModeAn(p - string) /* + 4 + la */
  				+ QRinput_estimateBitsModeNum(q - p) + 4 + ln
  				- QRinput_estimateBitsModeAn(q - string) /* - 4 - la */;
  			if(dif < 0) {
  				break;
  			} else {
  				p = q;
  			}
  		} else {
  			p++;
  		}
  	}
  
  	run = p - string;
  
  	if(*p & 0x80) {
  		dif = QRinput_estimateBitsModeAn(run) + 4 + la
  			+ QRinput_estimateBitsMode8(1) /* + 4 + l8 */
  			- QRinput_estimateBitsMode8(run + 1) /* - 4 - l8 */;
  		if(dif > 0) {
  			return Split_eat8(string, input, version, hint, casesensitive);
  		}
  	}
  
  	QRinput_append(input, QR_MODE_AN, run, (unsigned char *)string);
  	return run;
  }
  
  static int Split_eatKanji(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive)
  {
  	const char *p;
  
  	p = string;
  	while(QRinput_identifyMode(p) == QR_MODE_KANJI) {
  		p += 2;
  	}
  	QRinput_append(input, QR_MODE_KANJI, p - string, (unsigned char *)string);
  	return p - string;
  }
  
  static int Split_eat8(const char *string, QRinput *input, int version, QRencodeMode hint, int casesensitive)
  {
  	const char *p, *q;
  	QRencodeMode mode;
  	int dif;
  	int la, ln;
  
  	la = QRspec_lengthIndicator(QR_MODE_AN, version);
  	ln = QRspec_lengthIndicator(QR_MODE_NUM, version);
  
  	p = string;
  	while(*p != '\0') {
  		mode = QRinput_identifyMode(p);
  		if(hint == QR_MODE_KANJI && mode == QR_MODE_KANJI) {
  			break;
  		}
  		if(mode != QR_MODE_8 && mode != QR_MODE_KANJI) {
  			if(mode == QR_MODE_NUM) {
  				q = p;
  				while(isdigit(*q)) {
  					q++;
  				}
  				dif = QRinput_estimateBitsMode8(p - string) /* + 4 + l8 */
  					+ QRinput_estimateBitsModeNum(q - p) + 4 + ln
  					- QRinput_estimateBitsMode8(q - string) /* - 4 - l8 */;
  				if(dif < 0) {
  					break;
  				} else {
  					p = q;
  				}
  			} else if(!casesensitive) {
  				q = p;
  				while(isalnum(*q)) {
  					q++;
  				}
  				dif = QRinput_estimateBitsMode8(p - string) /* + 4 + l8 */
  					+ QRinput_estimateBitsModeAn(q - p) + 4 + la
  					- QRinput_estimateBitsMode8(q - string) /* - 4 - l8 */;
  				if(dif < 0) {
  					break;
  				} else {
  					p = q;
  				}
  			} else {
  				p++;
  			}
  		} else {
  			p++;
  		}
  	}
  
  	QRinput_append(input, QR_MODE_8, p - string, (unsigned char *)string);
  	return p - string;
  }
  
  void Split_splitStringToQRinput(const char *string, QRinput *input,
  		int version, QRencodeMode hint, int casesensitive)
  {
  	int length;
  	QRencodeMode mode;
  
  	if(*string == '\0') return;
  
  	mode = QRinput_identifyMode(string);
  	if(mode == QR_MODE_NUM) {
  		length = Split_eatNum(string, input, version, hint, casesensitive);
  	} else if(mode == QR_MODE_AN && !casesensitive) {
  		length = Split_eatAn(string, input, version, hint, casesensitive);
  	} else if(mode == QR_MODE_KANJI && hint == QR_MODE_KANJI) {
  		length = Split_eatKanji(string, input, version, hint, casesensitive);
  	} else {
  		length = Split_eat8(string, input, version, hint, casesensitive);
  	}
  	if(length == 0) return;
  	Split_splitStringToQRinput(&string[length], input, hint, version, casesensitive);
  }
  

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