1 /*
2 * Copyright (C) 1999-2004 Free Software Foundation, Inc.
3 * This file is part of the GNU LIBICONV Library.
4 *
5 * The GNU LIBICONV Library is free software; you can redistribute it
6 * and/or modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * The GNU LIBICONV Library is distributed in the hope that it will be
11 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
17 * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
18 * Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21 /*
22 * ISO-2022-JP-3
23 */
24
25 #include "jisx0213.h"
26
27 #define ESC 0x1b
28
29 /*
30 * The state is composed of one of the following values
31 */
32 #define STATE_ASCII 0 /* Esc ( B */
33 #define STATE_JISX0201ROMAN 1 /* Esc ( J */
34 #define STATE_JISX0201KATAKANA 2 /* Esc ( I */
35 #define STATE_JISX0208 3 /* Esc $ @ or Esc $ B */
36 #define STATE_JISX02131 4 /* Esc $ ( O or Esc $ ( Q*/
37 #define STATE_JISX02132 5 /* Esc $ ( P */
38
39 /*
40 * In the ISO-2022-JP-3 to UCS-4 direction, the state also holds the last
41 * character to be output, shifted by 3 bits.
42 */
43
44 static int
iso2022_jp3_mbtowc(conv_t conv,ucs4_t * pwc,const unsigned char * s,int n)45 iso2022_jp3_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
46 {
47 ucs4_t last_wc = conv->istate >> 3;
48 if (last_wc) {
49 /* Output the buffered character. */
50 conv->istate &= 7;
51 *pwc = last_wc;
52 return 0; /* Don't advance the input pointer. */
53 } else {
54 state_t state = conv->istate;
55 int count = 0;
56 unsigned char c;
57 for (;;) {
58 c = *s;
59 if (c == ESC) {
60 if (n < count+3)
61 goto none;
62 if (s[1] == '(') {
63 if (s[2] == 'B') {
64 state = STATE_ASCII;
65 s += 3; count += 3;
66 if (n < count+1)
67 goto none;
68 continue;
69 }
70 if (s[2] == 'J') {
71 state = STATE_JISX0201ROMAN;
72 s += 3; count += 3;
73 if (n < count+1)
74 goto none;
75 continue;
76 }
77 if (s[2] == 'I') {
78 state = STATE_JISX0201KATAKANA;
79 s += 3; count += 3;
80 if (n < count+1)
81 goto none;
82 continue;
83 }
84 return RET_ILSEQ;
85 }
86 if (s[1] == '$') {
87 if (s[2] == '@' || s[2] == 'B') {
88 /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
89 state = STATE_JISX0208;
90 s += 3; count += 3;
91 if (n < count+1)
92 goto none;
93 continue;
94 }
95 if (s[2] == '(') {
96 if (n < count+4)
97 goto none;
98 if (s[3] == 'O' || s[3] == 'Q') {
99 state = STATE_JISX02131;
100 s += 4; count += 4;
101 if (n < count+1)
102 goto none;
103 continue;
104 }
105 if (s[3] == 'P') {
106 state = STATE_JISX02132;
107 s += 4; count += 4;
108 if (n < count+1)
109 goto none;
110 continue;
111 }
112 }
113 return RET_ILSEQ;
114 }
115 return RET_ILSEQ;
116 }
117 break;
118 }
119 switch (state) {
120 case STATE_ASCII:
121 if (c < 0x80) {
122 int ret = ascii_mbtowc(conv,pwc,s,1);
123 if (ret == RET_ILSEQ)
124 return RET_ILSEQ;
125 if (ret != 1) abort();
126 conv->istate = state;
127 return count+1;
128 } else
129 return RET_ILSEQ;
130 case STATE_JISX0201ROMAN:
131 if (c < 0x80) {
132 int ret = jisx0201_mbtowc(conv,pwc,s,1);
133 if (ret == RET_ILSEQ)
134 return RET_ILSEQ;
135 if (ret != 1) abort();
136 conv->istate = state;
137 return count+1;
138 } else
139 return RET_ILSEQ;
140 case STATE_JISX0201KATAKANA:
141 if (c < 0x80) {
142 unsigned char buf = c+0x80;
143 int ret = jisx0201_mbtowc(conv,pwc,&buf,1);
144 if (ret == RET_ILSEQ)
145 return RET_ILSEQ;
146 if (ret != 1) abort();
147 conv->istate = state;
148 return count+1;
149 } else
150 return RET_ILSEQ;
151 case STATE_JISX0208:
152 if (n < count+2)
153 goto none;
154 if (s[0] < 0x80 && s[1] < 0x80) {
155 int ret = jisx0208_mbtowc(conv,pwc,s,2);
156 if (ret == RET_ILSEQ)
157 return RET_ILSEQ;
158 if (ret != 2) abort();
159 conv->istate = state;
160 return count+2;
161 } else
162 return RET_ILSEQ;
163 case STATE_JISX02131:
164 case STATE_JISX02132:
165 if (n < count+2)
166 goto none;
167 if (s[0] < 0x80 && s[1] < 0x80) {
168 ucs4_t wc = jisx0213_to_ucs4(((state-STATE_JISX02131+1)<<8)+s[0],s[1]);
169 if (wc) {
170 if (wc < 0x80) {
171 /* It's a combining character. */
172 ucs4_t wc1 = jisx0213_to_ucs_combining[wc - 1][0];
173 ucs4_t wc2 = jisx0213_to_ucs_combining[wc - 1][1];
174 /* We cannot output two Unicode characters at once. So,
175 output the first character and buffer the second one. */
176 *pwc = wc1;
177 conv->istate = (wc2 << 3) | state;
178 } else {
179 *pwc = wc;
180 conv->istate = state;
181 }
182 return count+2;
183 }
184 }
185 return RET_ILSEQ;
186 default: abort();
187 }
188 none:
189 conv->istate = state;
190 return RET_TOOFEW(count);
191 }
192 }
193
194 static int
iso2022_jp3_flushwc(conv_t conv,ucs4_t * pwc)195 iso2022_jp3_flushwc (conv_t conv, ucs4_t *pwc)
196 {
197 ucs4_t last_wc = conv->istate >> 3;
198 if (last_wc) {
199 /* Output the buffered character. */
200 conv->istate &= 7;
201 *pwc = last_wc;
202 return 1;
203 } else
204 return 0;
205 }
206
207 /*
208 * In the UCS-4 to ISO-2022-JP-3 direction, the state also holds the last two
209 * bytes to be output, shifted by 3 bits, and the STATE_xxxxx value that was
210 * effective before this buffered character, shifted by 19 bits.
211 */
212
213 /* Composition tables for each of the relevant combining characters. */
214 static const struct { unsigned short base; unsigned short composed; } iso2022_jp3_comp_table_data[] = {
215 #define iso2022_jp3_comp_table02e5_idx 0
216 #define iso2022_jp3_comp_table02e5_len 1
217 { 0x2b64, 0x2b65 }, /* 0x12B65 = 0x12B64 U+02E5 */
218 #define iso2022_jp3_comp_table02e9_idx (iso2022_jp3_comp_table02e5_idx+iso2022_jp3_comp_table02e5_len)
219 #define iso2022_jp3_comp_table02e9_len 1
220 { 0x2b60, 0x2b66 }, /* 0x12B66 = 0x12B60 U+02E9 */
221 #define iso2022_jp3_comp_table0300_idx (iso2022_jp3_comp_table02e9_idx+iso2022_jp3_comp_table02e9_len)
222 #define iso2022_jp3_comp_table0300_len 5
223 { 0x295c, 0x2b44 }, /* 0x12B44 = 0x1295C U+0300 */
224 { 0x2b38, 0x2b48 }, /* 0x12B48 = 0x12B38 U+0300 */
225 { 0x2b37, 0x2b4a }, /* 0x12B4A = 0x12B37 U+0300 */
226 { 0x2b30, 0x2b4c }, /* 0x12B4C = 0x12B30 U+0300 */
227 { 0x2b43, 0x2b4e }, /* 0x12B4E = 0x12B43 U+0300 */
228 #define iso2022_jp3_comp_table0301_idx (iso2022_jp3_comp_table0300_idx+iso2022_jp3_comp_table0300_len)
229 #define iso2022_jp3_comp_table0301_len 4
230 { 0x2b38, 0x2b49 }, /* 0x12B49 = 0x12B38 U+0301 */
231 { 0x2b37, 0x2b4b }, /* 0x12B4B = 0x12B37 U+0301 */
232 { 0x2b30, 0x2b4d }, /* 0x12B4D = 0x12B30 U+0301 */
233 { 0x2b43, 0x2b4f }, /* 0x12B4F = 0x12B43 U+0301 */
234 #define iso2022_jp3_comp_table309a_idx (iso2022_jp3_comp_table0301_idx+iso2022_jp3_comp_table0301_len)
235 #define iso2022_jp3_comp_table309a_len 14
236 { 0x242b, 0x2477 }, /* 0x12477 = 0x1242B U+309A */
237 { 0x242d, 0x2478 }, /* 0x12478 = 0x1242D U+309A */
238 { 0x242f, 0x2479 }, /* 0x12479 = 0x1242F U+309A */
239 { 0x2431, 0x247a }, /* 0x1247A = 0x12431 U+309A */
240 { 0x2433, 0x247b }, /* 0x1247B = 0x12433 U+309A */
241 { 0x252b, 0x2577 }, /* 0x12577 = 0x1252B U+309A */
242 { 0x252d, 0x2578 }, /* 0x12578 = 0x1252D U+309A */
243 { 0x252f, 0x2579 }, /* 0x12579 = 0x1252F U+309A */
244 { 0x2531, 0x257a }, /* 0x1257A = 0x12531 U+309A */
245 { 0x2533, 0x257b }, /* 0x1257B = 0x12533 U+309A */
246 { 0x253b, 0x257c }, /* 0x1257C = 0x1253B U+309A */
247 { 0x2544, 0x257d }, /* 0x1257D = 0x12544 U+309A */
248 { 0x2548, 0x257e }, /* 0x1257E = 0x12548 U+309A */
249 { 0x2675, 0x2678 }, /* 0x12678 = 0x12675 U+309A */
250 };
251
252 #define SPLIT_STATE \
253 unsigned short lasttwo = state >> 3; state_t prevstate = state >> 19; state &= 7
254 #define COMBINE_STATE \
255 state |= (prevstate << 19) | (lasttwo << 3)
256 #define COMBINE_STATE_NO_LASTTWO \
257 /* assume lasttwo == 0, then prevstate is ignored */
258
259 static int
iso2022_jp3_wctomb(conv_t conv,unsigned char * r,ucs4_t wc,int n)260 iso2022_jp3_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
261 {
262 int count = 0;
263 unsigned char buf[2];
264 unsigned short jch;
265 int ret;
266 state_t state = conv->ostate;
267 SPLIT_STATE;
268
269 if (lasttwo) {
270 /* Attempt to combine the last character with this one. */
271 unsigned int idx;
272 unsigned int len;
273
274 if (wc == 0x02e5)
275 idx = iso2022_jp3_comp_table02e5_idx,
276 len = iso2022_jp3_comp_table02e5_len;
277 else if (wc == 0x02e9)
278 idx = iso2022_jp3_comp_table02e9_idx,
279 len = iso2022_jp3_comp_table02e9_len;
280 else if (wc == 0x0300)
281 idx = iso2022_jp3_comp_table0300_idx,
282 len = iso2022_jp3_comp_table0300_len;
283 else if (wc == 0x0301)
284 idx = iso2022_jp3_comp_table0301_idx,
285 len = iso2022_jp3_comp_table0301_len;
286 else if (wc == 0x309a)
287 idx = iso2022_jp3_comp_table309a_idx,
288 len = iso2022_jp3_comp_table309a_len;
289 else
290 goto not_combining;
291
292 do
293 if (iso2022_jp3_comp_table_data[idx].base == lasttwo)
294 break;
295 while (++idx, --len > 0);
296
297 if (len > 0) {
298 /* Output the combined character. */
299 /* We know the combined character is in JISX0213 plane 1, but
300 the buffered character may have been in JISX0208 or in
301 JISX0213 plane 1. */
302 count = (state != STATE_JISX02131 ? 4 : 0) + 2;
303 if (n < count)
304 return RET_TOOSMALL;
305 if (state != STATE_JISX02131) {
306 r[0] = ESC;
307 r[1] = '$';
308 r[2] = '(';
309 r[3] = 'Q';
310 r += 4;
311 state = STATE_JISX02131;
312 }
313 lasttwo = iso2022_jp3_comp_table_data[idx].composed;
314 r[0] = (lasttwo >> 8) & 0xff;
315 r[1] = lasttwo & 0xff;
316 COMBINE_STATE_NO_LASTTWO;
317 conv->ostate = state;
318 return count;
319 }
320
321 not_combining:
322 /* Output the buffered character. */
323 /* We know it is in JISX0208 or in JISX0213 plane 1. */
324 count = (prevstate != state ? 3 : 0) + 2;
325 if (n < count)
326 return RET_TOOSMALL;
327 if (prevstate != state) {
328 if (state != STATE_JISX0208) abort();
329 r[0] = ESC;
330 r[1] = '$';
331 r[2] = 'B';
332 r += 3;
333 }
334 r[0] = (lasttwo >> 8) & 0xff;
335 r[1] = lasttwo & 0xff;
336 r += 2;
337 }
338
339 /* Try ASCII. */
340 ret = ascii_wctomb(conv,buf,wc,1);
341 if (ret != RET_ILUNI) {
342 if (ret != 1) abort();
343 if (buf[0] < 0x80) {
344 count += (state == STATE_ASCII ? 1 : 4);
345 if (n < count)
346 return RET_TOOSMALL;
347 if (state != STATE_ASCII) {
348 r[0] = ESC;
349 r[1] = '(';
350 r[2] = 'B';
351 r += 3;
352 state = STATE_ASCII;
353 }
354 r[0] = buf[0];
355 COMBINE_STATE_NO_LASTTWO;
356 conv->ostate = state;
357 return count;
358 }
359 }
360
361 /* Try JIS X 0201-1976 Roman. */
362 ret = jisx0201_wctomb(conv,buf,wc,1);
363 if (ret != RET_ILUNI) {
364 if (ret != 1) abort();
365 if (buf[0] < 0x80) {
366 count += (state == STATE_JISX0201ROMAN ? 1 : 4);
367 if (n < count)
368 return RET_TOOSMALL;
369 if (state != STATE_JISX0201ROMAN) {
370 r[0] = ESC;
371 r[1] = '(';
372 r[2] = 'J';
373 r += 3;
374 state = STATE_JISX0201ROMAN;
375 }
376 r[0] = buf[0];
377 COMBINE_STATE_NO_LASTTWO;
378 conv->ostate = state;
379 return count;
380 }
381 }
382
383 jch = ucs4_to_jisx0213(wc);
384
385 /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */
386 ret = jisx0208_wctomb(conv,buf,wc,2);
387 if (ret != RET_ILUNI) {
388 if (ret != 2) abort();
389 if (buf[0] < 0x80 && buf[1] < 0x80) {
390 if (jch & 0x0080) {
391 /* A possible match in comp_table_data. Buffer it. */
392 prevstate = state;
393 lasttwo = jch & 0x7f7f;
394 state = STATE_JISX0208;
395 COMBINE_STATE;
396 conv->ostate = state;
397 return count;
398 } else {
399 count += (state == STATE_JISX0208 ? 2 : 5);
400 if (n < count)
401 return RET_TOOSMALL;
402 if (state != STATE_JISX0208) {
403 r[0] = ESC;
404 r[1] = '$';
405 r[2] = 'B';
406 r += 3;
407 state = STATE_JISX0208;
408 }
409 r[0] = buf[0];
410 r[1] = buf[1];
411 COMBINE_STATE_NO_LASTTWO;
412 conv->ostate = state;
413 return count;
414 }
415 }
416 }
417
418 /* Try JISX 0213 plane 1 and JISX 0213 plane 2. */
419 if (jch != 0) {
420 if (jch & 0x8000) {
421 /* JISX 0213 plane 2. */
422 if (state != STATE_JISX02132) {
423 count += 4;
424 if (n < count)
425 return RET_TOOSMALL;
426 r[0] = ESC;
427 r[1] = '$';
428 r[2] = '(';
429 r[3] = 'P';
430 r += 4;
431 state = STATE_JISX02132;
432 }
433 } else {
434 /* JISX 0213 plane 1. */
435 if (state != STATE_JISX02131) {
436 count += 4;
437 if (n < count)
438 return RET_TOOSMALL;
439 r[0] = ESC;
440 r[1] = '$';
441 r[2] = '(';
442 r[3] = 'Q';
443 r += 4;
444 state = STATE_JISX02131;
445 }
446 }
447 if (jch & 0x0080) {
448 /* A possible match in comp_table_data. We have to buffer it. */
449 /* We know it's a JISX 0213 plane 1 character. */
450 if (jch & 0x8000) abort();
451 prevstate = state;
452 lasttwo = jch & 0x7f7f;
453 COMBINE_STATE;
454 conv->ostate = state;
455 return count;
456 }
457 count += 2;
458 if (n < count)
459 return RET_TOOSMALL;
460 r[0] = (jch >> 8) & 0x7f;
461 r[1] = jch & 0x7f;
462 COMBINE_STATE_NO_LASTTWO;
463 conv->ostate = state;
464 return count;
465 }
466
467 /* Try JIS X 0201-1976 Katakana. This is not officially part of
468 ISO-2022-JP-3. Therefore we try it after all other attempts. */
469 ret = jisx0201_wctomb(conv,buf,wc,1);
470 if (ret != RET_ILUNI) {
471 if (ret != 1) abort();
472 if (buf[0] >= 0x80) {
473 count += (state == STATE_JISX0201KATAKANA ? 1 : 4);
474 if (n < count)
475 return RET_TOOSMALL;
476 if (state != STATE_JISX0201KATAKANA) {
477 r[0] = ESC;
478 r[1] = '(';
479 r[2] = 'I';
480 r += 3;
481 state = STATE_JISX0201KATAKANA;
482 }
483 r[0] = buf[0]-0x80;
484 COMBINE_STATE_NO_LASTTWO;
485 conv->ostate = state;
486 return count;
487 }
488 }
489
490 return RET_ILUNI;
491 }
492
493 static int
iso2022_jp3_reset(conv_t conv,unsigned char * r,int n)494 iso2022_jp3_reset (conv_t conv, unsigned char *r, int n)
495 {
496 state_t state = conv->ostate;
497 SPLIT_STATE;
498 {
499 int count =
500 (lasttwo ? (prevstate != state ? 3 : 0) + 2 : 0)
501 + (state != STATE_ASCII ? 3 : 0);
502 if (n < count)
503 return RET_TOOSMALL;
504 if (lasttwo) {
505 if (prevstate != state) {
506 if (state != STATE_JISX0208) abort();
507 r[0] = ESC;
508 r[1] = '$';
509 r[2] = 'B';
510 r += 3;
511 }
512 r[0] = (lasttwo >> 8) & 0xff;
513 r[1] = lasttwo & 0xff;
514 r += 2;
515 }
516 if (state != STATE_ASCII) {
517 r[0] = ESC;
518 r[1] = '(';
519 r[2] = 'B';
520 }
521 /* conv->ostate = 0; will be done by the caller */
522 return count;
523 }
524 }
525
526 #undef COMBINE_STATE_NO_LASTTWO
527 #undef COMBINE_STATE
528 #undef SPLIT_STATE
529 #undef STATE_JISX02132
530 #undef STATE_JISX02131
531 #undef STATE_JISX0208
532 #undef STATE_JISX0201KATAKANA
533 #undef STATE_JISX0201ROMAN
534 #undef STATE_ASCII
535