File indexing completed on 2024-05-12 05:46:27

 /*
  * This file is part of the KDE libraries
  *
  * Copyright (c) 2000-2003 Shiro Kawai <shirok@users.sourceforge.net>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *  1. Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *
  *  2. Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  *  3. Neither the name of the authors nor the names of its contributors
  *     may be used to endorse or promote products derived from this
  *     software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 /*
  * original code is here.
  * http://cvs.sourceforge.net/viewcvs.py/gauche/Gauche/ext/charconv/guess.c?view=markup
  */
 #ifndef GUESS_JA_H
 #define GUESS_JA_H
 
 class guess_arc {
  public:
   unsigned int next;          /* next state */
   double score;               /* score */
 };
 
 
 typedef signed char dfa_table[256];
 
 /* DFA tables declared in guess_ja.cpp */
 extern const dfa_table guess_eucj_st[];
 extern guess_arc guess_eucj_ar[7];
 extern const dfa_table guess_sjis_st[];
 extern guess_arc guess_sjis_ar[6];
 extern const dfa_table guess_utf8_st[];
 extern guess_arc guess_utf8_ar[11];
 
 class guess_dfa {
  public:
   const dfa_table *states;
   const guess_arc *arcs;
   int state;
   double score;
   
  guess_dfa (const dfa_table stable[], const guess_arc *atable) :
   states(stable), arcs(atable)
   {
     state = 0;
     score = 1.0;
   }
 };
 
 class JapaneseCode
 {
  public:
   enum Type {K_ASCII, K_JIS, K_EUC, K_SJIS, K_UNICODE, K_UTF8 };
   enum Type guess_jp(const char* buf, int buflen);
   
   JapaneseCode () {
     eucj = new guess_dfa(guess_eucj_st, guess_eucj_ar);
     sjis = new guess_dfa(guess_sjis_st, guess_sjis_ar);
     utf8 = new guess_dfa(guess_utf8_st, guess_utf8_ar);
     last_JIS_escape = false;
   }
   
   ~JapaneseCode () {
     delete eucj;
     delete sjis;
     delete utf8;
   }
   
  protected:
   guess_dfa *eucj;
   guess_dfa *sjis;
   guess_dfa *utf8;
   
   bool last_JIS_escape;
 };
 
 #define DFA_NEXT(dfa, ch)                               \
     do {                                                \
         int arc__;                                      \
         if (dfa->state >= 0) {                          \
             arc__ = dfa->states[dfa->state][ch];        \
             if (arc__ < 0) {                            \
                 dfa->state = -1;                        \
             } else {                                    \
                 dfa->state = dfa->arcs[arc__].next;     \
                 dfa->score *= dfa->arcs[arc__].score;   \
             }                                           \
         }                                               \
     } while (0)
 
 #define DFA_ALIVE(dfa)  (dfa->state >= 0)
 
 #endif  /* GUESS_JA_H */