1 /*
2  * "streamable kanji code filter and converter"
3  * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
4  *
5  * LICENSE NOTICES
6  *
7  * This file is part of "streamable kanji code filter and converter",
8  * which is distributed under the terms of GNU Lesser General Public
9  * License (version 2) as published by the Free Software Foundation.
10  *
11  * This software is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with "streamable kanji code filter and converter";
18  * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
19  * Suite 330, Boston, MA  02111-1307  USA
20  *
21  * The author of this file:
22  *
23  */
24 /*
25  * The source code included in this files was separated from mbfilter_ja.c
26  * by moriyoshi koizumi <moriyoshi@php.net> on 4 dec 2002.
27  *
28  */
29 
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33 
34 #include "mbfilter.h"
35 #include "mbfilter_sjis.h"
36 
37 #define UNICODE_TABLE_CP932_DEF
38 #define UNICODE_TABLE_JIS_DEF
39 
40 #include "unicode_table_cp932_ext.h"
41 #include "unicode_table_jis.h"
42 
43 int mbfl_filt_ident_sjis(int c, mbfl_identify_filter *filter);
44 
45 const unsigned char mblen_table_sjis[] = { /* 0x80-0x9f,0xE0-0xFF */
46   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
47   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
48   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
49   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
50   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
51   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
52   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
53   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
54   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
55   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
56   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
57   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
58   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
59   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
60   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
61   2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
62 };
63 
64 static const char *mbfl_encoding_sjis_aliases[] = {"x-sjis", "SHIFT-JIS", NULL};
65 
66 const mbfl_encoding mbfl_encoding_sjis = {
67 	mbfl_no_encoding_sjis,
68 	"SJIS",
69 	"Shift_JIS",
70 	(const char *(*)[])&mbfl_encoding_sjis_aliases,
71 	mblen_table_sjis,
72 	MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_GL_UNSAFE
73 };
74 
75 const struct mbfl_identify_vtbl vtbl_identify_sjis = {
76 	mbfl_no_encoding_sjis,
77 	mbfl_filt_ident_common_ctor,
78 	mbfl_filt_ident_common_dtor,
79 	mbfl_filt_ident_sjis
80 };
81 
82 const struct mbfl_convert_vtbl vtbl_sjis_wchar = {
83 	mbfl_no_encoding_sjis,
84 	mbfl_no_encoding_wchar,
85 	mbfl_filt_conv_common_ctor,
86 	mbfl_filt_conv_common_dtor,
87 	mbfl_filt_conv_sjis_wchar,
88 	mbfl_filt_conv_common_flush
89 };
90 
91 const struct mbfl_convert_vtbl vtbl_wchar_sjis = {
92 	mbfl_no_encoding_wchar,
93 	mbfl_no_encoding_sjis,
94 	mbfl_filt_conv_common_ctor,
95 	mbfl_filt_conv_common_dtor,
96 	mbfl_filt_conv_wchar_sjis,
97 	mbfl_filt_conv_common_flush
98 };
99 
100 #define CK(statement)	do { if ((statement) < 0) return (-1); } while (0)
101 
102 #define SJIS_ENCODE(c1,c2,s1,s2)	\
103 		do {						\
104 			s1 = c1;				\
105 			s1--;					\
106 			s1 >>= 1;				\
107 			if ((c1) < 0x5f) {		\
108 				s1 += 0x71;			\
109 			} else {				\
110 				s1 += 0xb1;			\
111 			}						\
112 			s2 = c2;				\
113 			if ((c1) & 1) {			\
114 				if ((c2) < 0x60) {	\
115 					s2--;			\
116 				}					\
117 				s2 += 0x20;			\
118 			} else {				\
119 				s2 += 0x7e;			\
120 			}						\
121 		} while (0)
122 
123 #define SJIS_DECODE(c1,c2,s1,s2)	\
124 		do {						\
125 			s1 = c1;				\
126 			if (s1 < 0xa0) {		\
127 				s1 -= 0x81;			\
128 			} else {				\
129 				s1 -= 0xc1;			\
130 			}						\
131 			s1 <<= 1;				\
132 			s1 += 0x21;				\
133 			s2 = c2;				\
134 			if (s2 < 0x9f) {		\
135 				if (s2 < 0x7f) {	\
136 					s2++;			\
137 				}					\
138 				s2 -= 0x20;			\
139 			} else {				\
140 				s1++;				\
141 				s2 -= 0x7e;			\
142 			}						\
143 		} while (0)
144 
145 
146 /*
147  * SJIS => wchar
148  */
149 int
mbfl_filt_conv_sjis_wchar(int c,mbfl_convert_filter * filter)150 mbfl_filt_conv_sjis_wchar(int c, mbfl_convert_filter *filter)
151 {
152 	int c1, s1, s2, w;
153 
154 	switch (filter->status) {
155 	case 0:
156 		if (c >= 0 && c < 0x80) {	/* latin */
157 			CK((*filter->output_function)(c, filter->data));
158 		} else if (c > 0xa0 && c < 0xe0) {	/* kana */
159 			CK((*filter->output_function)(0xfec0 + c, filter->data));
160 		} else if (c > 0x80 && c < 0xfd && c != 0xa0) {	/* kanji first char */
161 			filter->status = 1;
162 			filter->cache = c;
163 		} else {
164 			w = c & MBFL_WCSGROUP_MASK;
165 			w |= MBFL_WCSGROUP_THROUGH;
166 			CK((*filter->output_function)(w, filter->data));
167 		}
168 		break;
169 
170 	case 1:		/* kanji second char */
171 		filter->status = 0;
172 		c1 = filter->cache;
173 		if (c >= 0x40 && c <= 0xfc && c != 0x7f) {
174 			SJIS_DECODE(c1, c, s1, s2);
175 			w = (s1 - 0x21)*94 + s2 - 0x21;
176 			if (w >= 0 && w < jisx0208_ucs_table_size) {
177 				w = jisx0208_ucs_table[w];
178 			} else {
179 				w = 0;
180 			}
181 			if (w <= 0) {
182 				if (s1 < 0x7f && s2 < 0x7f) {
183 					w = (s1 << 8) | s2;
184 					w &= MBFL_WCSPLANE_MASK;
185 					w |= MBFL_WCSPLANE_JIS0208;
186 				} else {
187 					w = (c1 << 8) | c;
188 					w &= MBFL_WCSGROUP_MASK;
189 					w |= MBFL_WCSGROUP_THROUGH;
190 				}
191 			}
192 			CK((*filter->output_function)(w, filter->data));
193 		} else if ((c >= 0 && c < 0x21) || c == 0x7f) {		/* CTLs */
194 			CK((*filter->output_function)(c, filter->data));
195 		} else {
196 			w = (c1 << 8) | c;
197 			w &= MBFL_WCSGROUP_MASK;
198 			w |= MBFL_WCSGROUP_THROUGH;
199 			CK((*filter->output_function)(w, filter->data));
200 		}
201 		break;
202 
203 	default:
204 		filter->status = 0;
205 		break;
206 	}
207 
208 	return c;
209 }
210 
211 /*
212  * wchar => SJIS
213  */
214 int
mbfl_filt_conv_wchar_sjis(int c,mbfl_convert_filter * filter)215 mbfl_filt_conv_wchar_sjis(int c, mbfl_convert_filter *filter)
216 {
217 	int c1, c2, s1, s2;
218 
219 	s1 = 0;
220 	if (c >= ucs_a1_jis_table_min && c < ucs_a1_jis_table_max) {
221 		s1 = ucs_a1_jis_table[c - ucs_a1_jis_table_min];
222 	} else if (c >= ucs_a2_jis_table_min && c < ucs_a2_jis_table_max) {
223 		s1 = ucs_a2_jis_table[c - ucs_a2_jis_table_min];
224 	} else if (c >= ucs_i_jis_table_min && c < ucs_i_jis_table_max) {
225 		s1 = ucs_i_jis_table[c - ucs_i_jis_table_min];
226 	} else if (c >= ucs_r_jis_table_min && c < ucs_r_jis_table_max) {
227 		s1 = ucs_r_jis_table[c - ucs_r_jis_table_min];
228 	}
229 	if (s1 <= 0) {
230 		c1 = c & ~MBFL_WCSPLANE_MASK;
231 		if (c1 == MBFL_WCSPLANE_JIS0208) {
232 			s1 = c & MBFL_WCSPLANE_MASK;
233 		} else if (c == 0xa5) {		/* YEN SIGN */
234 			s1 = 0x216f;	/* FULLWIDTH YEN SIGN */
235 		} else if (c == 0x203e) {	/* OVER LINE */
236 			s1 = 0x2131;	/* FULLWIDTH MACRON */
237 		} else if (c == 0xff3c) {	/* FULLWIDTH REVERSE SOLIDUS */
238 			s1 = 0x2140;
239 		} else if (c == 0xff5e) {	/* FULLWIDTH TILDE */
240 			s1 = 0x2141;
241 		} else if (c == 0x2225) {	/* PARALLEL TO */
242 			s1 = 0x2142;
243 		} else if (c == 0xff0d) {	/* FULLWIDTH HYPHEN-MINUS */
244 			s1 = 0x215d;
245 		} else if (c == 0xffe0) {	/* FULLWIDTH CENT SIGN */
246 			s1 = 0x2171;
247 		} else if (c == 0xffe1) {	/* FULLWIDTH POUND SIGN */
248 			s1 = 0x2172;
249 		} else if (c == 0xffe2) {	/* FULLWIDTH NOT SIGN */
250 			s1 = 0x224c;
251 		}
252 		if (c == 0) {
253 			s1 = 0;
254 		} else if (s1 <= 0) {
255 			s1 = -1;
256 		}
257 	} else if (s1 >= 0x8080) {
258 		s1 = -1;
259 	}
260 	if (s1 >= 0) {
261 		if (s1 < 0x100) { /* latin or kana */
262 			CK((*filter->output_function)(s1, filter->data));
263 		} else { /* kanji */
264 			c1 = (s1 >> 8) & 0xff;
265 			c2 = s1 & 0xff;
266 			SJIS_ENCODE(c1, c2, s1, s2);
267 			CK((*filter->output_function)(s1, filter->data));
268 			CK((*filter->output_function)(s2, filter->data));
269 		}
270 	} else {
271 		if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
272 			CK(mbfl_filt_conv_illegal_output(c, filter));
273 		}
274 	}
275 
276 	return c;
277 }
278 
mbfl_filt_ident_sjis(int c,mbfl_identify_filter * filter)279 int mbfl_filt_ident_sjis(int c, mbfl_identify_filter *filter)
280 {
281 	if (filter->status) {		/* kanji second char */
282 		if (c < 0x40 || c > 0xfc || c == 0x7f) {	/* bad */
283 		    filter->flag = 1;
284 		}
285 		filter->status = 0;
286 	} else if (c >= 0 && c < 0x80) {	/* latin  ok */
287 		;
288 	} else if (c > 0xa0 && c < 0xe0) {	/* kana  ok */
289 		;
290 	} else if (c > 0x80 && c < 0xf0 && c != 0xa0) {	/* kanji first char */
291 		filter->status = 1;
292 	} else {							/* bad */
293 		filter->flag = 1;
294 	}
295 
296 	return c;
297 }
298