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+/*
+ * This file is part of the KDE libraries
+ *
+ * Copyright (c) 2000-2003 Shiro Kawai, All rights reserved.
+ *
+ * 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
+
+namespace khtml {
+ class guess_arc {
+ public:
+ unsigned int next; /* next state */
+ double score; /* score */
+ };
+}
+
+using namespace khtml;
+
+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];
+
+namespace khtml {
+
+ 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 */