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/*
* 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 {ASCII, JIS, EUC, SJIS, UNICODE, 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 () {
if (eucj) delete eucj;
if (sjis) delete sjis;
if (utf8) 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 */
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