1: /*
2: * Copyright (C) 1999-2004, 2008 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
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: goto 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: goto ilseq;
114: }
115: goto 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: goto ilseq;
125: if (ret != 1) abort();
126: conv->istate = state;
127: return count+1;
128: } else
129: goto ilseq;
130: case STATE_JISX0201ROMAN:
131: if (c < 0x80) {
132: int ret = jisx0201_mbtowc(conv,pwc,s,1);
133: if (ret == RET_ILSEQ)
134: goto ilseq;
135: if (ret != 1) abort();
136: conv->istate = state;
137: return count+1;
138: } else
139: goto 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: goto ilseq;
146: if (ret != 1) abort();
147: conv->istate = state;
148: return count+1;
149: } else
150: goto 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: goto ilseq;
158: if (ret != 2) abort();
159: conv->istate = state;
160: return count+2;
161: } else
162: goto 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: goto ilseq;
186: default: abort();
187: }
188: none:
189: conv->istate = state;
190: return RET_TOOFEW(count);
191:
192: ilseq:
193: conv->istate = state;
194: return RET_SHIFT_ILSEQ(count);
195: }
196: }
197:
198: static int
199: iso2022_jp3_flushwc (conv_t conv, ucs4_t *pwc)
200: {
201: ucs4_t last_wc = conv->istate >> 3;
202: if (last_wc) {
203: /* Output the buffered character. */
204: conv->istate &= 7;
205: *pwc = last_wc;
206: return 1;
207: } else
208: return 0;
209: }
210:
211: /*
212: * In the UCS-4 to ISO-2022-JP-3 direction, the state also holds the last two
213: * bytes to be output, shifted by 3 bits, and the STATE_xxxxx value that was
214: * effective before this buffered character, shifted by 19 bits.
215: */
216:
217: /* Composition tables for each of the relevant combining characters. */
218: static const struct { unsigned short base; unsigned short composed; } iso2022_jp3_comp_table_data[] = {
219: #define iso2022_jp3_comp_table02e5_idx 0
220: #define iso2022_jp3_comp_table02e5_len 1
221: { 0x2b64, 0x2b65 }, /* 0x12B65 = 0x12B64 U+02E5 */
222: #define iso2022_jp3_comp_table02e9_idx (iso2022_jp3_comp_table02e5_idx+iso2022_jp3_comp_table02e5_len)
223: #define iso2022_jp3_comp_table02e9_len 1
224: { 0x2b60, 0x2b66 }, /* 0x12B66 = 0x12B60 U+02E9 */
225: #define iso2022_jp3_comp_table0300_idx (iso2022_jp3_comp_table02e9_idx+iso2022_jp3_comp_table02e9_len)
226: #define iso2022_jp3_comp_table0300_len 5
227: { 0x295c, 0x2b44 }, /* 0x12B44 = 0x1295C U+0300 */
228: { 0x2b38, 0x2b48 }, /* 0x12B48 = 0x12B38 U+0300 */
229: { 0x2b37, 0x2b4a }, /* 0x12B4A = 0x12B37 U+0300 */
230: { 0x2b30, 0x2b4c }, /* 0x12B4C = 0x12B30 U+0300 */
231: { 0x2b43, 0x2b4e }, /* 0x12B4E = 0x12B43 U+0300 */
232: #define iso2022_jp3_comp_table0301_idx (iso2022_jp3_comp_table0300_idx+iso2022_jp3_comp_table0300_len)
233: #define iso2022_jp3_comp_table0301_len 4
234: { 0x2b38, 0x2b49 }, /* 0x12B49 = 0x12B38 U+0301 */
235: { 0x2b37, 0x2b4b }, /* 0x12B4B = 0x12B37 U+0301 */
236: { 0x2b30, 0x2b4d }, /* 0x12B4D = 0x12B30 U+0301 */
237: { 0x2b43, 0x2b4f }, /* 0x12B4F = 0x12B43 U+0301 */
238: #define iso2022_jp3_comp_table309a_idx (iso2022_jp3_comp_table0301_idx+iso2022_jp3_comp_table0301_len)
239: #define iso2022_jp3_comp_table309a_len 14
240: { 0x242b, 0x2477 }, /* 0x12477 = 0x1242B U+309A */
241: { 0x242d, 0x2478 }, /* 0x12478 = 0x1242D U+309A */
242: { 0x242f, 0x2479 }, /* 0x12479 = 0x1242F U+309A */
243: { 0x2431, 0x247a }, /* 0x1247A = 0x12431 U+309A */
244: { 0x2433, 0x247b }, /* 0x1247B = 0x12433 U+309A */
245: { 0x252b, 0x2577 }, /* 0x12577 = 0x1252B U+309A */
246: { 0x252d, 0x2578 }, /* 0x12578 = 0x1252D U+309A */
247: { 0x252f, 0x2579 }, /* 0x12579 = 0x1252F U+309A */
248: { 0x2531, 0x257a }, /* 0x1257A = 0x12531 U+309A */
249: { 0x2533, 0x257b }, /* 0x1257B = 0x12533 U+309A */
250: { 0x253b, 0x257c }, /* 0x1257C = 0x1253B U+309A */
251: { 0x2544, 0x257d }, /* 0x1257D = 0x12544 U+309A */
252: { 0x2548, 0x257e }, /* 0x1257E = 0x12548 U+309A */
253: { 0x2675, 0x2678 }, /* 0x12678 = 0x12675 U+309A */
254: };
255:
256: #define SPLIT_STATE \
257: unsigned short lasttwo = state >> 3; state_t prevstate = state >> 19; state &= 7
258: #define COMBINE_STATE \
259: state |= (prevstate << 19) | (lasttwo << 3)
260: #define COMBINE_STATE_NO_LASTTWO \
261: /* assume lasttwo == 0, then prevstate is ignored */
262:
263: static int
264: iso2022_jp3_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
265: {
266: int count = 0;
267: unsigned char buf[2];
268: unsigned short jch;
269: int ret;
270: state_t state = conv->ostate;
271: SPLIT_STATE;
272:
273: if (lasttwo) {
274: /* Attempt to combine the last character with this one. */
275: unsigned int idx;
276: unsigned int len;
277:
278: if (wc == 0x02e5)
279: idx = iso2022_jp3_comp_table02e5_idx,
280: len = iso2022_jp3_comp_table02e5_len;
281: else if (wc == 0x02e9)
282: idx = iso2022_jp3_comp_table02e9_idx,
283: len = iso2022_jp3_comp_table02e9_len;
284: else if (wc == 0x0300)
285: idx = iso2022_jp3_comp_table0300_idx,
286: len = iso2022_jp3_comp_table0300_len;
287: else if (wc == 0x0301)
288: idx = iso2022_jp3_comp_table0301_idx,
289: len = iso2022_jp3_comp_table0301_len;
290: else if (wc == 0x309a)
291: idx = iso2022_jp3_comp_table309a_idx,
292: len = iso2022_jp3_comp_table309a_len;
293: else
294: goto not_combining;
295:
296: do
297: if (iso2022_jp3_comp_table_data[idx].base == lasttwo)
298: break;
299: while (++idx, --len > 0);
300:
301: if (len > 0) {
302: /* Output the combined character. */
303: /* We know the combined character is in JISX0213 plane 1, but
304: the buffered character may have been in JISX0208 or in
305: JISX0213 plane 1. */
306: count = (state != STATE_JISX02131 ? 4 : 0) + 2;
307: if (n < count)
308: return RET_TOOSMALL;
309: if (state != STATE_JISX02131) {
310: r[0] = ESC;
311: r[1] = '$';
312: r[2] = '(';
313: r[3] = 'Q';
314: r += 4;
315: state = STATE_JISX02131;
316: }
317: lasttwo = iso2022_jp3_comp_table_data[idx].composed;
318: r[0] = (lasttwo >> 8) & 0xff;
319: r[1] = lasttwo & 0xff;
320: COMBINE_STATE_NO_LASTTWO;
321: conv->ostate = state;
322: return count;
323: }
324:
325: not_combining:
326: /* Output the buffered character. */
327: /* We know it is in JISX0208 or in JISX0213 plane 1. */
328: count = (prevstate != state ? 3 : 0) + 2;
329: if (n < count)
330: return RET_TOOSMALL;
331: if (prevstate != state) {
332: if (state != STATE_JISX0208) abort();
333: r[0] = ESC;
334: r[1] = '$';
335: r[2] = 'B';
336: r += 3;
337: }
338: r[0] = (lasttwo >> 8) & 0xff;
339: r[1] = lasttwo & 0xff;
340: r += 2;
341: }
342:
343: /* Try ASCII. */
344: ret = ascii_wctomb(conv,buf,wc,1);
345: if (ret != RET_ILUNI) {
346: if (ret != 1) abort();
347: if (buf[0] < 0x80) {
348: count += (state == STATE_ASCII ? 1 : 4);
349: if (n < count)
350: return RET_TOOSMALL;
351: if (state != STATE_ASCII) {
352: r[0] = ESC;
353: r[1] = '(';
354: r[2] = 'B';
355: r += 3;
356: state = STATE_ASCII;
357: }
358: r[0] = buf[0];
359: COMBINE_STATE_NO_LASTTWO;
360: conv->ostate = state;
361: return count;
362: }
363: }
364:
365: /* Try JIS X 0201-1976 Roman. */
366: ret = jisx0201_wctomb(conv,buf,wc,1);
367: if (ret != RET_ILUNI) {
368: if (ret != 1) abort();
369: if (buf[0] < 0x80) {
370: count += (state == STATE_JISX0201ROMAN ? 1 : 4);
371: if (n < count)
372: return RET_TOOSMALL;
373: if (state != STATE_JISX0201ROMAN) {
374: r[0] = ESC;
375: r[1] = '(';
376: r[2] = 'J';
377: r += 3;
378: state = STATE_JISX0201ROMAN;
379: }
380: r[0] = buf[0];
381: COMBINE_STATE_NO_LASTTWO;
382: conv->ostate = state;
383: return count;
384: }
385: }
386:
387: jch = ucs4_to_jisx0213(wc);
388:
389: /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */
390: ret = jisx0208_wctomb(conv,buf,wc,2);
391: if (ret != RET_ILUNI) {
392: if (ret != 2) abort();
393: if (buf[0] < 0x80 && buf[1] < 0x80) {
394: if (jch & 0x0080) {
395: /* A possible match in comp_table_data. Buffer it. */
396: prevstate = state;
397: lasttwo = jch & 0x7f7f;
398: state = STATE_JISX0208;
399: COMBINE_STATE;
400: conv->ostate = state;
401: return count;
402: } else {
403: count += (state == STATE_JISX0208 ? 2 : 5);
404: if (n < count)
405: return RET_TOOSMALL;
406: if (state != STATE_JISX0208) {
407: r[0] = ESC;
408: r[1] = '$';
409: r[2] = 'B';
410: r += 3;
411: state = STATE_JISX0208;
412: }
413: r[0] = buf[0];
414: r[1] = buf[1];
415: COMBINE_STATE_NO_LASTTWO;
416: conv->ostate = state;
417: return count;
418: }
419: }
420: }
421:
422: /* Try JISX 0213 plane 1 and JISX 0213 plane 2. */
423: if (jch != 0) {
424: if (jch & 0x8000) {
425: /* JISX 0213 plane 2. */
426: if (state != STATE_JISX02132) {
427: count += 4;
428: if (n < count)
429: return RET_TOOSMALL;
430: r[0] = ESC;
431: r[1] = '$';
432: r[2] = '(';
433: r[3] = 'P';
434: r += 4;
435: state = STATE_JISX02132;
436: }
437: } else {
438: /* JISX 0213 plane 1. */
439: if (state != STATE_JISX02131) {
440: count += 4;
441: if (n < count)
442: return RET_TOOSMALL;
443: r[0] = ESC;
444: r[1] = '$';
445: r[2] = '(';
446: r[3] = 'Q';
447: r += 4;
448: state = STATE_JISX02131;
449: }
450: }
451: if (jch & 0x0080) {
452: /* A possible match in comp_table_data. We have to buffer it. */
453: /* We know it's a JISX 0213 plane 1 character. */
454: if (jch & 0x8000) abort();
455: prevstate = state;
456: lasttwo = jch & 0x7f7f;
457: COMBINE_STATE;
458: conv->ostate = state;
459: return count;
460: }
461: count += 2;
462: if (n < count)
463: return RET_TOOSMALL;
464: r[0] = (jch >> 8) & 0x7f;
465: r[1] = jch & 0x7f;
466: COMBINE_STATE_NO_LASTTWO;
467: conv->ostate = state;
468: return count;
469: }
470:
471: /* Try JIS X 0201-1976 Katakana. This is not officially part of
472: ISO-2022-JP-3. Therefore we try it after all other attempts. */
473: ret = jisx0201_wctomb(conv,buf,wc,1);
474: if (ret != RET_ILUNI) {
475: if (ret != 1) abort();
476: if (buf[0] >= 0x80) {
477: count += (state == STATE_JISX0201KATAKANA ? 1 : 4);
478: if (n < count)
479: return RET_TOOSMALL;
480: if (state != STATE_JISX0201KATAKANA) {
481: r[0] = ESC;
482: r[1] = '(';
483: r[2] = 'I';
484: r += 3;
485: state = STATE_JISX0201KATAKANA;
486: }
487: r[0] = buf[0]-0x80;
488: COMBINE_STATE_NO_LASTTWO;
489: conv->ostate = state;
490: return count;
491: }
492: }
493:
494: return RET_ILUNI;
495: }
496:
497: static int
498: iso2022_jp3_reset (conv_t conv, unsigned char *r, int n)
499: {
500: state_t state = conv->ostate;
501: SPLIT_STATE;
502: {
503: int count =
504: (lasttwo ? (prevstate != state ? 3 : 0) + 2 : 0)
505: + (state != STATE_ASCII ? 3 : 0);
506: if (n < count)
507: return RET_TOOSMALL;
508: if (lasttwo) {
509: if (prevstate != state) {
510: if (state != STATE_JISX0208) abort();
511: r[0] = ESC;
512: r[1] = '$';
513: r[2] = 'B';
514: r += 3;
515: }
516: r[0] = (lasttwo >> 8) & 0xff;
517: r[1] = lasttwo & 0xff;
518: r += 2;
519: }
520: if (state != STATE_ASCII) {
521: r[0] = ESC;
522: r[1] = '(';
523: r[2] = 'B';
524: }
525: /* conv->ostate = 0; will be done by the caller */
526: return count;
527: }
528: }
529:
530: #undef COMBINE_STATE_NO_LASTTWO
531: #undef COMBINE_STATE
532: #undef SPLIT_STATE
533: #undef STATE_JISX02132
534: #undef STATE_JISX02131
535: #undef STATE_JISX0208
536: #undef STATE_JISX0201KATAKANA
537: #undef STATE_JISX0201ROMAN
538: #undef STATE_ASCII
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