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split.c

/*
 * qrencode - QR Code encoder
 *
 * Input data splitter.
 * Copyright (C) 2006, 2007, 2008, 2009 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 <stdlib.h>
#include <string.h>
#include <errno.h>
#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 QRencodeMode Split_identifyMode(const char *string, QRencodeMode hint)
{
      unsigned char c, d;
      unsigned int word;

      c = string[0];

      if(c == '\0') return QR_MODE_NUL;
      if(isdigit(c)) {
            return QR_MODE_NUM;
      } else if(isalnum(c)) {
            return QR_MODE_AN;
      } else if(hint == QR_MODE_KANJI) {
            d = string[1];
            if(d != '\0') {
                  word = ((unsigned int)c << 8) | d;
                  if((word >= 0x8140 && word <= 0x9ffc) || (word >= 0xe040 && word <= 0xebbf)) {
                        return QR_MODE_KANJI;
                  }
            }
      }

      return QR_MODE_8;
}

static int Split_eatNum(const char *string, QRinput *input, QRencodeMode hint);
static int Split_eatAn(const char *string, QRinput *input, QRencodeMode hint);
static int Split_eat8(const char *string, QRinput *input, QRencodeMode hint);
static int Split_eatKanji(const char *string, QRinput *input, QRencodeMode hint);

static int Split_eatNum(const char *string, QRinput *input,QRencodeMode hint)
{
      const char *p;
      int ret;
      int run;
      int dif;
      int ln;
      QRencodeMode mode;

      ln = QRspec_lengthIndicator(QR_MODE_NUM, input->version);

      p = string;
      while(isdigit(*p)) {
            p++;
      }
      run = p - string;
      mode = Split_identifyMode(p, hint);
      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 Split_eat8(string, input, hint);
            }
      }
      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 Split_eatAn(string, input, hint);
            }
      }

      ret = QRinput_append(input, QR_MODE_NUM, run, (unsigned char *)string);
      if(ret < 0) return -1;

      return run;
}

static int Split_eatAn(const char *string, QRinput *input, QRencodeMode hint)
{
      const char *p, *q;
      int ret;
      int run;
      int dif;
      int la, ln;

      la = QRspec_lengthIndicator(QR_MODE_AN, input->version);
      ln = QRspec_lengthIndicator(QR_MODE_NUM, input->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 && !isalnum(*p)) {
            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, hint);
            }
      }

      ret = QRinput_append(input, QR_MODE_AN, run, (unsigned char *)string);
      if(ret < 0) return -1;

      return run;
}

static int Split_eatKanji(const char *string, QRinput *input, QRencodeMode hint)
{
      const char *p;
      int ret;
      int run;

      p = string;
      while(Split_identifyMode(p, hint) == QR_MODE_KANJI) {
            p += 2;
      }
      run = p - string;
      ret = QRinput_append(input, QR_MODE_KANJI, run, (unsigned char *)string);
      if(ret < 0) return -1;

      return run;
}

static int Split_eat8(const char *string, QRinput *input, QRencodeMode hint)
{
      const char *p, *q;
      QRencodeMode mode;
      int ret;
      int run;
      int dif;
      int la, ln;

      la = QRspec_lengthIndicator(QR_MODE_AN, input->version);
      ln = QRspec_lengthIndicator(QR_MODE_NUM, input->version);

      p = string + 1;
      while(*p != '\0') {
            mode = Split_identifyMode(p, hint);
            if(mode == QR_MODE_KANJI) {
                  break;
            }
            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(mode == QR_MODE_AN) {
                  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++;
            }
      }

      run = p - string;
      ret = QRinput_append(input, QR_MODE_8, run, (unsigned char *)string);
      if(ret < 0) return -1;

      return run;
}

static int Split_splitString(const char *string, QRinput *input,
            QRencodeMode hint)
{
      int length;
      QRencodeMode mode;

      if(*string == '\0') return 0;

      mode = Split_identifyMode(string, hint);
      if(mode == QR_MODE_NUM) {
            length = Split_eatNum(string, input, hint);
      } else if(mode == QR_MODE_AN) {
            length = Split_eatAn(string, input, hint);
      } else if(mode == QR_MODE_KANJI && hint == QR_MODE_KANJI) {
            length = Split_eatKanji(string, input, hint);
      } else {
            length = Split_eat8(string, input, hint);
      }
      if(length == 0) return 0;
      if(length < 0) return -1;
      return Split_splitString(&string[length], input, hint);
}

static char *dupAndToUpper(const char *str, QRencodeMode hint)
{
      char *newstr, *p;
      QRencodeMode mode;

      newstr = strdup(str);
      if(newstr == NULL) return NULL;

      p = newstr;
      while(*p != '\0') {
            mode = Split_identifyMode(p, hint);
            if(mode == QR_MODE_KANJI) {
                  p += 2;
            } else {
                  if (*p >= 'a' && *p <= 'z') {
                        *p = (char)((int)*p - 32);
                  }
                  p++;
            }
      }

      return newstr;
}

int Split_splitStringToQRinput(const char *string, QRinput *input,
            QRencodeMode hint, int casesensitive)
{
      char *newstr;
      int ret;

      if(string == NULL || *string == '\0') {
            errno = EINVAL;
            return -1;
      }
      if(!casesensitive) {
            newstr = dupAndToUpper(string, hint);
            if(newstr == NULL) return -1;
            ret = Split_splitString(newstr, input, hint);
            free(newstr);
      } else {
            ret = Split_splitString(string, input, hint);
      }

      return ret;
}

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