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
|
/*
* Copyright (C) 1999-2001, 2008 Free Software Foundation, Inc.
* This file is part of the GNU LIBICONV Library.
*
* The GNU LIBICONV Library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* The GNU LIBICONV Library is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
* If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
* Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* ISO-2022-CN
*/
/* 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
/*
* and one of the following values, << 16
*/
#define STATE3_NONE 0
#define STATE3_DESIGNATED_CNS11643_2 1
#define SPLIT_STATE \
unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = state >> 16
#define COMBINE_STATE \
state = (state3 << 16) | (state2 << 8) | state1
static int
iso2022_cn_mbtowc (conv_t conv, ucs4_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[2] == '*') {
if (s[3] == 'H') {
state3 = STATE3_DESIGNATED_CNS11643_2;
s += 4; count += 4;
if (n < count+1)
goto none;
continue;
}
}
}
if (s[1] == 'N') {
switch (state3) {
case STATE3_NONE:
goto 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)
goto ilseq;
if (ret != 2) abort();
COMBINE_STATE;
conv->istate = state;
return count+4;
} else
goto ilseq;
default: abort();
}
}
goto ilseq;
}
if (c == SO) {
if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1)
goto 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)
goto ilseq;
if (ret != 1) abort();
if (*pwc == 0x000a || *pwc == 0x000d) {
state2 = STATE2_NONE; state3 = STATE3_NONE;
}
COMBINE_STATE;
conv->istate = state;
return count+1;
} else
goto ilseq;
case STATE_TWOBYTE:
if (n < count+2)
goto none;
if (s[0] < 0x80 && s[1] < 0x80) {
int ret;
switch (state2) {
case STATE2_NONE:
goto 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;
default: abort();
}
if (ret == RET_ILSEQ)
goto ilseq;
if (ret != 2) abort();
COMBINE_STATE;
conv->istate = state;
return count+2;
} else
goto ilseq;
default: abort();
}
none:
COMBINE_STATE;
conv->istate = state;
return RET_TOOFEW(count);
ilseq:
COMBINE_STATE;
conv->istate = state;
return RET_SHIFT_ILSEQ(count);
}
static int
iso2022_cn_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
state_t state = conv->ostate;
SPLIT_STATE;
unsigned char buf[3];
int ret;
/* There is no need to handle Unicode 3.1 tag characters and to look for
"zh-CN" or "zh-TW" tags, because GB2312 and CNS11643 are disjoint. */
/* Try ASCII. */
ret = ascii_wctomb(conv,buf,wc,1);
if (ret != RET_ILUNI) {
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;
}
COMBINE_STATE;
conv->ostate = state;
return count;
}
}
/* Try GB 2312-1980. */
ret = gb2312_wctomb(conv,buf,wc,2);
if (ret != RET_ILUNI) {
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_ILUNI) {
if (ret != 3) abort();
/* Try CNS 11643-1992 Plane 1. */
if (buf[0] == 1 && 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] = '$';
r[2] = ')';
r[3] = 'G';
r += 4;
state2 = STATE2_DESIGNATED_CNS11643_1;
}
if (state1 != STATE_TWOBYTE) {
r[0] = SO;
r += 1;
state1 = STATE_TWOBYTE;
}
r[0] = buf[1];
r[1] = buf[2];
COMBINE_STATE;
conv->ostate = state;
return count;
}
/* Try CNS 11643-1992 Plane 2. */
if (buf[0] == 2 && buf[1] < 0x80 && buf[2] < 0x80) {
int count = (state3 == STATE3_DESIGNATED_CNS11643_2 ? 0 : 4) + 4;
if (n < count)
return RET_TOOSMALL;
if (state3 != STATE3_DESIGNATED_CNS11643_2) {
r[0] = ESC;
r[1] = '$';
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;
}
}
return RET_ILUNI;
}
static int
iso2022_cn_reset (conv_t conv, unsigned char *r, int n)
{
state_t state = conv->ostate;
SPLIT_STATE;
(void)state2;
(void)state3;
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 STATE3_DESIGNATED_CNS11643_2
#undef STATE3_NONE
#undef STATE2_DESIGNATED_CNS11643_1
#undef STATE2_DESIGNATED_GB2312
#undef STATE2_NONE
#undef STATE_TWOBYTE
#undef STATE_ASCII
|
