1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
|
/*
* ISO-2022-CN-EXT
*/
/* Specification: RFC 1922 */
#define ESC 0x1b
#define SO 0x0e
#define SI 0x0f
/*
* The state is composed of one of the following values
*/
#define STATE_ASCII 0
#define STATE_TWOBYTE 1
/*
* and one of the following values, << 8
*/
#define STATE2_NONE 0
#define STATE2_DESIGNATED_GB2312 1
#define STATE2_DESIGNATED_CNS11643_1 2
#define STATE2_DESIGNATED_ISO_IR_165 3
/*
* and one of the following values, << 16
*/
#define STATE3_NONE 0
#define STATE3_DESIGNATED_CNS11643_2 1
/*
* and one of the following values, << 24
*/
#define STATE4_NONE 0
#define STATE4_DESIGNATED_CNS11643_3 1
#define STATE4_DESIGNATED_CNS11643_4 2
#define STATE4_DESIGNATED_CNS11643_5 3
#define STATE4_DESIGNATED_CNS11643_6 4
#define STATE4_DESIGNATED_CNS11643_7 5
#define SPLIT_STATE \
unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = (state >> 16) & 0xff, state4 = state >> 24
#define COMBINE_STATE \
state = (state4 << 24) | (state3 << 16) | (state2 << 8) | state1
static int
iso2022_cn_ext_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n)
{
state_t state = conv->istate;
SPLIT_STATE;
int count = 0;
unsigned char c;
for (;;) {
c = *s;
if (c == ESC) {
if (n < count+4)
goto none;
if (s[1] == '$') {
if (s[2] == ')') {
if (s[3] == 'A') {
state2 = STATE2_DESIGNATED_GB2312;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
if (s[3] == 'G') {
state2 = STATE2_DESIGNATED_CNS11643_1;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
if (s[3] == 'E') {
state2 = STATE2_DESIGNATED_ISO_IR_165;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
}
if (s[2] == '*') {
if (s[3] == 'H') {
state3 = STATE3_DESIGNATED_CNS11643_2;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
}
if (s[2] == '+') {
if (s[3] == 'I') {
state4 = STATE4_DESIGNATED_CNS11643_3;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
if (s[3] == 'J') {
state4 = STATE4_DESIGNATED_CNS11643_4;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
if (s[3] == 'K') {
state4 = STATE4_DESIGNATED_CNS11643_5;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
if (s[3] == 'L') {
state4 = STATE4_DESIGNATED_CNS11643_6;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
if (s[3] == 'M') {
state4 = STATE4_DESIGNATED_CNS11643_7;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
}
}
if (s[1] == 'N') {
switch (state3) {
case STATE3_NONE:
return RET_ILSEQ;
case STATE3_DESIGNATED_CNS11643_2:
if (s[2] < 0x80 && s[3] < 0x80) {
int ret = cns11643_2_mbtowc(conv,pwc,s+2,2);
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 2) abort();
COMBINE_STATE;
conv->istate = state;
return count+4;
} else
return RET_ILSEQ;
default: abort();
}
}
if (s[1] == 'O') {
switch (state4) {
case STATE4_NONE:
return RET_ILSEQ;
case STATE4_DESIGNATED_CNS11643_3:
if (s[2] < 0x80 && s[3] < 0x80) {
int ret = cns11643_3_mbtowc(conv,pwc,s+2,2);
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 2) abort();
COMBINE_STATE;
conv->istate = state;
return count+4;
} else
return RET_ILSEQ;
case STATE4_DESIGNATED_CNS11643_4:
if (s[2] < 0x80 && s[3] < 0x80) {
/* We don't have a CNS 11643-4 to Unicode table yet. */
return RET_ILSEQ;
} else
return RET_ILSEQ;
case STATE4_DESIGNATED_CNS11643_5:
if (s[2] < 0x80 && s[3] < 0x80) {
/* We don't have a CNS 11643-5 to Unicode table yet. */
return RET_ILSEQ;
} else
return RET_ILSEQ;
case STATE4_DESIGNATED_CNS11643_6:
if (s[2] < 0x80 && s[3] < 0x80) {
/* We don't have a CNS 11643-6 to Unicode table yet. */
return RET_ILSEQ;
} else
return RET_ILSEQ;
case STATE4_DESIGNATED_CNS11643_7:
if (s[2] < 0x80 && s[3] < 0x80) {
/* We don't have a CNS 11643-7 to Unicode table yet. */
return RET_ILSEQ;
} else
return RET_ILSEQ;
default: abort();
}
}
return RET_ILSEQ;
}
if (c == SO) {
if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1 && state2 != STATE2_DESIGNATED_ISO_IR_165)
return RET_ILSEQ;
state1 = STATE_TWOBYTE;
s++; count++;
if (n < count+1)
goto none;
continue;
}
if (c == SI) {
state1 = STATE_ASCII;
s++; count++;
if (n < count+1)
goto none;
continue;
}
break;
}
switch (state1) {
case STATE_ASCII:
if (c < 0x80) {
int ret = ascii_mbtowc(conv,pwc,s,1);
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 1) abort();
if (*pwc == 0x000a || *pwc == 0x000d) {
state2 = STATE2_NONE; state3 = STATE3_NONE; state4 = STATE3_NONE;
}
COMBINE_STATE;
conv->istate = state;
return count+1;
} else
return RET_ILSEQ;
case STATE_TWOBYTE:
if (n < count+2)
goto none;
if (s[0] < 0x80 && s[1] < 0x80) {
int ret;
switch (state2) {
case STATE2_NONE:
return RET_ILSEQ;
case STATE2_DESIGNATED_GB2312:
ret = gb2312_mbtowc(conv,pwc,s,2); break;
case STATE2_DESIGNATED_CNS11643_1:
ret = cns11643_1_mbtowc(conv,pwc,s,2); break;
case STATE2_DESIGNATED_ISO_IR_165:
/* We don't have an ISO-IR-165 table yet. */
ret = gb2312_mbtowc(conv,pwc,s,2); break;
default: abort();
}
if (ret == RET_ILSEQ)
return RET_ILSEQ;
if (ret != 2) abort();
COMBINE_STATE;
conv->istate = state;
return count+2;
} else
return RET_ILSEQ;
default: abort();
}
none:
COMBINE_STATE;
conv->istate = state;
return RET_TOOFEW(count);
}
static int
iso2022_cn_ext_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n)
{
state_t state = conv->ostate;
SPLIT_STATE;
unsigned char buf[3];
int ret;
/* Try ASCII. */
ret = ascii_wctomb(conv,buf,wc,1);
if (ret != RET_ILSEQ) {
if (ret != 1) abort();
if (buf[0] < 0x80) {
int count = (state1 == STATE_ASCII ? 1 : 2);
if (n < count)
return RET_TOOSMALL;
if (state1 != STATE_ASCII) {
r[0] = SI;
r += 1;
state1 = STATE_ASCII;
}
r[0] = buf[0];
if (wc == 0x000a || wc == 0x000d) {
state2 = STATE2_NONE; state3 = STATE3_NONE; state4 = STATE3_NONE;
}
COMBINE_STATE;
conv->ostate = state;
return count;
}
}
/* Try GB 2312-1980. */
ret = gb2312_wctomb(conv,buf,wc,2);
if (ret != RET_ILSEQ) {
if (ret != 2) abort();
if (buf[0] < 0x80 && buf[1] < 0x80) {
int count = (state2 == STATE2_DESIGNATED_GB2312 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
if (n < count)
return RET_TOOSMALL;
if (state2 != STATE2_DESIGNATED_GB2312) {
r[0] = ESC;
r[1] = '$';
r[2] = ')';
r[3] = 'A';
r += 4;
state2 = STATE2_DESIGNATED_GB2312;
}
if (state1 != STATE_TWOBYTE) {
r[0] = SO;
r += 1;
state1 = STATE_TWOBYTE;
}
r[0] = buf[0];
r[1] = buf[1];
COMBINE_STATE;
conv->ostate = state;
return count;
}
}
ret = cns11643_wctomb(conv,buf,wc,3);
if (ret != RET_ILSEQ) {
if (ret != 3) abort();
/* Try CNS 11643-1992 Plane 1. */
if (buf[0] == 0 && buf[1] < 0x80 && buf[2] < 0x80) {
int count = (state2 == STATE2_DESIGNATED_CNS11643_1 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
if (n < count)
return RET_TOOSMALL;
if (state2 != STATE2_DESIGNATED_CNS11643_1) {
r[0] = ESC;
r[1] = '$';
r[2] = ')';
r[3] = 'G';
r += 4;
state2 = STATE2_DESIGNATED_CNS11643_1;
}
if (state1 != STATE_TWOBYTE) {
r[0] = SO;
r += 1;
state1 = STATE_TWOBYTE;
}
r[0] = buf[1];
r[1] = buf[2];
COMBINE_STATE;
conv->ostate = state;
return count;
}
/* Try CNS 11643-1992 Plane 2. */
if (buf[0] == 1 && buf[1] < 0x80 && buf[2] < 0x80) {
int count = (state3 == STATE3_DESIGNATED_CNS11643_2 ? 0 : 4) + 4;
if (n < count)
return RET_TOOSMALL;
if (state3 != STATE3_DESIGNATED_CNS11643_2) {
r[0] = ESC;
r[1] = '$';
r[2] = '*';
r[3] = 'H';
r += 4;
state3 = STATE3_DESIGNATED_CNS11643_2;
}
r[0] = ESC;
r[1] = 'N';
r[2] = buf[1];
r[3] = buf[2];
COMBINE_STATE;
conv->ostate = state;
return count;
}
/* Try CNS 11643-1992 Plane 3. */
if (buf[0] == 2 && buf[1] < 0x80 && buf[2] < 0x80) {
int count = (state4 == STATE4_DESIGNATED_CNS11643_3 ? 0 : 4) + 4;
if (n < count)
return RET_TOOSMALL;
if (state4 != STATE4_DESIGNATED_CNS11643_3) {
r[0] = ESC;
r[1] = '$';
r[2] = '+';
r[3] = 'I';
r += 4;
state4 = STATE4_DESIGNATED_CNS11643_3;
}
r[0] = ESC;
r[1] = 'O';
r[2] = buf[1];
r[3] = buf[2];
COMBINE_STATE;
conv->ostate = state;
return count;
}
/* No table for CNS 11643-1992 Plane 4 yet. */
/* No table for CNS 11643-1992 Plane 5 yet. */
/* No table for CNS 11643-1992 Plane 6 yet. */
/* No table for CNS 11643-1992 Plane 7 yet. */
}
/* No table for ISO-IR-165 yet. */
return RET_ILSEQ;
}
static int
iso2022_cn_ext_reset (conv_t conv, unsigned char *r, int n)
{
state_t state = conv->ostate;
SPLIT_STATE;
(void)state2;
(void)state3;
(void)state4;
if (state1 != STATE_ASCII) {
if (n < 1)
return RET_TOOSMALL;
r[0] = SI;
/* conv->ostate = 0; will be done by the caller */
return 1;
} else
return 0;
}
#undef COMBINE_STATE
#undef SPLIT_STATE
#undef STATE4_DESIGNATED_CNS11643_7
#undef STATE4_DESIGNATED_CNS11643_6
#undef STATE4_DESIGNATED_CNS11643_5
#undef STATE4_DESIGNATED_CNS11643_4
#undef STATE4_DESIGNATED_CNS11643_3
#undef STATE4_NONE
#undef STATE3_DESIGNATED_CNS11643_2
#undef STATE3_NONE
#undef STATE2_DESIGNATED_ISO_IR_165
#undef STATE2_DESIGNATED_CNS11643_1
#undef STATE2_DESIGNATED_GB2312
#undef STATE2_NONE
#undef STATE_TWOBYTE
#undef STATE_ASCII
|
