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: Rui Hirokawa <hirokawa@php.net>
22 *
23 */
24 /*
25 * The source code included in this files was separated from mbfilter_tw.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_big5.h"
36
37 #include "unicode_table_big5.h"
38
39 static int mbfl_filt_ident_big5(int c, mbfl_identify_filter *filter);
40
41 static const unsigned char mblen_table_big5[] = { /* 0x81-0xFE */
42 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
43 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
44 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
45 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
51 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
52 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
53 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
57 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
58 };
59
60 static const char *mbfl_encoding_big5_aliases[] = {"CN-BIG5", "BIG-FIVE", "BIGFIVE", NULL};
61
62 const mbfl_encoding mbfl_encoding_big5 = {
63 mbfl_no_encoding_big5,
64 "BIG-5",
65 "BIG5",
66 (const char *(*)[])&mbfl_encoding_big5_aliases,
67 mblen_table_big5,
68 MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_GL_UNSAFE,
69 &vtbl_big5_wchar,
70 &vtbl_wchar_big5
71 };
72
73 const mbfl_encoding mbfl_encoding_cp950 = {
74 mbfl_no_encoding_cp950,
75 "CP950",
76 "BIG5",
77 NULL,
78 mblen_table_big5,
79 MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_GL_UNSAFE,
80 &vtbl_cp950_wchar,
81 &vtbl_wchar_cp950
82 };
83
84 const struct mbfl_identify_vtbl vtbl_identify_big5 = {
85 mbfl_no_encoding_big5,
86 mbfl_filt_ident_common_ctor,
87 mbfl_filt_ident_common_dtor,
88 mbfl_filt_ident_big5
89 };
90
91 const struct mbfl_identify_vtbl vtbl_identify_cp950 = {
92 mbfl_no_encoding_cp950,
93 mbfl_filt_ident_common_ctor,
94 mbfl_filt_ident_common_dtor,
95 mbfl_filt_ident_big5
96 };
97
98 const struct mbfl_convert_vtbl vtbl_big5_wchar = {
99 mbfl_no_encoding_big5,
100 mbfl_no_encoding_wchar,
101 mbfl_filt_conv_common_ctor,
102 mbfl_filt_conv_common_dtor,
103 mbfl_filt_conv_big5_wchar,
104 mbfl_filt_conv_common_flush
105 };
106
107 const struct mbfl_convert_vtbl vtbl_wchar_big5 = {
108 mbfl_no_encoding_wchar,
109 mbfl_no_encoding_big5,
110 mbfl_filt_conv_common_ctor,
111 mbfl_filt_conv_common_dtor,
112 mbfl_filt_conv_wchar_big5,
113 mbfl_filt_conv_common_flush
114 };
115
116 const struct mbfl_convert_vtbl vtbl_cp950_wchar = {
117 mbfl_no_encoding_cp950,
118 mbfl_no_encoding_wchar,
119 mbfl_filt_conv_common_ctor,
120 mbfl_filt_conv_common_dtor,
121 mbfl_filt_conv_big5_wchar,
122 mbfl_filt_conv_common_flush
123 };
124
125 const struct mbfl_convert_vtbl vtbl_wchar_cp950 = {
126 mbfl_no_encoding_wchar,
127 mbfl_no_encoding_cp950,
128 mbfl_filt_conv_common_ctor,
129 mbfl_filt_conv_common_dtor,
130 mbfl_filt_conv_wchar_big5,
131 mbfl_filt_conv_common_flush
132 };
133
134 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
135
136 /* 63 + 94 = 157 or 94 */
137 static unsigned short cp950_pua_tbl[][4] = {
138 {0xe000,0xe310,0xfa40,0xfefe},
139 {0xe311,0xeeb7,0x8e40,0xa0fe},
140 {0xeeb8,0xf6b0,0x8140,0x8dfe},
141 {0xf6b1,0xf70e,0xc6a1,0xc6fe},
142 {0xf70f,0xf848,0xc740,0xc8fe},
143 };
144
is_in_cp950_pua(int c1,int c)145 static inline int is_in_cp950_pua(int c1, int c) {
146 if ((c1 >= 0xfa && c1 <= 0xfe) || (c1 >= 0x8e && c1 <= 0xa0) ||
147 (c1 >= 0x81 && c1 <= 0x8d) || (c1 >= 0xc7 && c1 <= 0xc8)) {
148 return (c >=0x40 && c <= 0x7e) || (c >= 0xa1 && c <= 0xfe);
149 }
150 if (c1 == 0xc6) {
151 return c >= 0xa1 && c <= 0xfe;
152 }
153 return 0;
154 }
155
156 /*
157 * Big5 => wchar
158 */
159 int
mbfl_filt_conv_big5_wchar(int c,mbfl_convert_filter * filter)160 mbfl_filt_conv_big5_wchar(int c, mbfl_convert_filter *filter)
161 {
162 int k;
163 int c1, w, c2;
164
165 switch (filter->status) {
166 case 0:
167 if (filter->from->no_encoding == mbfl_no_encoding_cp950) {
168 c1 = 0x80;
169 } else {
170 c1 = 0xa0;
171 }
172
173 if (c >= 0 && c <= 0x80) { /* latin */
174 CK((*filter->output_function)(c, filter->data));
175 } else if (c == 0xff) {
176 CK((*filter->output_function)(0xf8f8, filter->data));
177 } else if (c > c1 && c < 0xff) { /* dbcs lead byte */
178 filter->status = 1;
179 filter->cache = c;
180 } else {
181 w = c & MBFL_WCSGROUP_MASK;
182 w |= MBFL_WCSGROUP_THROUGH;
183 CK((*filter->output_function)(w, filter->data));
184 }
185 break;
186
187 case 1: /* dbcs second byte */
188 filter->status = 0;
189 c1 = filter->cache;
190 if ((c > 0x39 && c < 0x7f) | (c > 0xa0 && c < 0xff)) {
191 if (c < 0x7f){
192 w = (c1 - 0xa1)*157 + (c - 0x40);
193 } else {
194 w = (c1 - 0xa1)*157 + (c - 0xa1) + 0x3f;
195 }
196 if (w >= 0 && w < big5_ucs_table_size) {
197 w = big5_ucs_table[w];
198 } else {
199 w = 0;
200 }
201
202 if (filter->from->no_encoding == mbfl_no_encoding_cp950) {
203 /* PUA for CP950 */
204 if (w <= 0 && is_in_cp950_pua(c1, c)) {
205 c2 = c1 << 8 | c;
206 for (k = 0; k < sizeof(cp950_pua_tbl)/(sizeof(unsigned short)*4); k++) {
207 if (c2 >= cp950_pua_tbl[k][2] && c2 <= cp950_pua_tbl[k][3]) {
208 break;
209 }
210 }
211
212 if ((cp950_pua_tbl[k][2] & 0xff) == 0x40) {
213 w = 157*(c1 - (cp950_pua_tbl[k][2]>>8)) + c - (c >= 0xa1 ? 0x62 : 0x40)
214 + cp950_pua_tbl[k][0];
215 } else {
216 w = c2 - cp950_pua_tbl[k][2] + cp950_pua_tbl[k][0];
217 }
218 }
219 }
220
221 if (w <= 0) {
222 w = (c1 << 8) | c;
223 w &= MBFL_WCSPLANE_MASK;
224 w |= MBFL_WCSPLANE_BIG5;
225 }
226 CK((*filter->output_function)(w, filter->data));
227 } else if ((c >= 0 && c < 0x21) || c == 0x7f) { /* CTLs */
228 CK((*filter->output_function)(c, filter->data));
229 } else {
230 w = (c1 << 8) | c;
231 w &= MBFL_WCSGROUP_MASK;
232 w |= MBFL_WCSGROUP_THROUGH;
233 CK((*filter->output_function)(w, filter->data));
234 }
235 break;
236
237 default:
238 filter->status = 0;
239 break;
240 }
241
242 return c;
243 }
244
245 /*
246 * wchar => Big5
247 */
248 int
mbfl_filt_conv_wchar_big5(int c,mbfl_convert_filter * filter)249 mbfl_filt_conv_wchar_big5(int c, mbfl_convert_filter *filter)
250 {
251 int k;
252 int c1, s, c2;
253
254 s = 0;
255 if (c >= ucs_a1_big5_table_min && c < ucs_a1_big5_table_max) {
256 s = ucs_a1_big5_table[c - ucs_a1_big5_table_min];
257 } else if (c >= ucs_a2_big5_table_min && c < ucs_a2_big5_table_max) {
258 s = ucs_a2_big5_table[c - ucs_a2_big5_table_min];
259 } else if (c >= ucs_a3_big5_table_min && c < ucs_a3_big5_table_max) {
260 s = ucs_a3_big5_table[c - ucs_a3_big5_table_min];
261 } else if (c >= ucs_i_big5_table_min && c < ucs_i_big5_table_max) {
262 s = ucs_i_big5_table[c - ucs_i_big5_table_min];
263 } else if (c >= ucs_pua_big5_table_min && c < ucs_pua_big5_table_max) {
264 s = ucs_pua_big5_table[c - ucs_pua_big5_table_min];
265 } else if (c >= ucs_r1_big5_table_min && c < ucs_r1_big5_table_max) {
266 s = ucs_r1_big5_table[c - ucs_r1_big5_table_min];
267 } else if (c >= ucs_r2_big5_table_min && c < ucs_r2_big5_table_max) {
268 s = ucs_r2_big5_table[c - ucs_r2_big5_table_min];
269 }
270
271 if (filter->to->no_encoding == mbfl_no_encoding_cp950) {
272 if (c >= 0xe000 && c <= 0xf848) { /* PUA for CP950 */
273 for (k = 0; k < sizeof(cp950_pua_tbl)/(sizeof(unsigned short)*4); k++) {
274 if (c <= cp950_pua_tbl[k][1]) {
275 break;
276 }
277 }
278 c1 = c - cp950_pua_tbl[k][0];
279 if ((cp950_pua_tbl[k][2] & 0xff) == 0x40) {
280 c2 = cp950_pua_tbl[k][2] >> 8;
281 s = ((c1 / 157) + c2) << 8; c1 %= 157;
282 s |= c1 + (c1 >= 0x3f ? 0x62 : 0x40);
283 } else {
284 s = c1 + cp950_pua_tbl[k][2];
285 }
286 }
287
288 if (c == 0x80) {
289 s = 0x80;
290 } else if (c == 0xf8f8) {
291 s = 0xff;
292 } else if (c == 0x256d) {
293 s = 0xa27e;
294 } else if (c == 0x256e) {
295 s = 0xa2a1;
296 } else if (c == 0x256f) {
297 s = 0xa2a3;
298 } else if (c == 0x2570) {
299 s = 0xa2a2;
300 }
301 }
302
303 if (s <= 0) {
304 c1 = c & ~MBFL_WCSPLANE_MASK;
305 if (c1 == MBFL_WCSPLANE_BIG5) {
306 s = c & MBFL_WCSPLANE_MASK;
307 }
308 if (c == 0) {
309 s = 0;
310 } else if (s <= 0) {
311 s = -1;
312 }
313 }
314 if (s >= 0) {
315 if (s <= 0x80 || s == 0xff) { /* latin */
316 CK((*filter->output_function)(s, filter->data));
317 } else {
318 CK((*filter->output_function)((s >> 8) & 0xff, filter->data));
319 CK((*filter->output_function)(s & 0xff, filter->data));
320 }
321 } else {
322 CK(mbfl_filt_conv_illegal_output(c, filter));
323 }
324
325 return c;
326 }
327
mbfl_filt_ident_big5(int c,mbfl_identify_filter * filter)328 static int mbfl_filt_ident_big5(int c, mbfl_identify_filter *filter)
329 {
330 int c1;
331 if (filter->encoding->no_encoding == mbfl_no_encoding_cp950) {
332 c1 = 0x80;
333 } else {
334 c1 = 0xa0;
335 }
336
337 if (filter->status) { /* kanji second char */
338 if (c < 0x40 || (c > 0x7e && c < 0xa1) ||c > 0xfe) { /* bad */
339 filter->flag = 1;
340 }
341 filter->status = 0;
342 } else if (c >= 0 && c < 0x80) { /* latin ok */
343 ;
344 } else if (c > c1 && c < 0xff) { /* DBCS lead byte */
345 filter->status = 1;
346 } else { /* bad */
347 filter->flag = 1;
348 }
349
350 return c;
351 }
352
