citrus_utf1632.c revision 1.7 1 /* $NetBSD: citrus_utf1632.c,v 1.7 2006/10/27 14:13:55 tnozaki Exp $ */
2
3 /*-
4 * Copyright (c)2003 Citrus Project,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #if defined(LIBC_SCCS) && !defined(lint)
31 __RCSID("$NetBSD: citrus_utf1632.c,v 1.7 2006/10/27 14:13:55 tnozaki Exp $");
32 #endif /* LIBC_SCCS and not lint */
33
34 #include <assert.h>
35 #include <errno.h>
36 #include <string.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <stddef.h>
40 #include <locale.h>
41 #include <limits.h>
42 #include <wchar.h>
43 #include <sys/types.h>
44 #include <machine/endian.h>
45
46 #include "citrus_namespace.h"
47 #include "citrus_types.h"
48 #include "citrus_module.h"
49 #include "citrus_stdenc.h"
50 #include "citrus_bcs.h"
51
52 #include "citrus_utf1632.h"
53
54
55 /* ----------------------------------------------------------------------
56 * private stuffs used by templates
57 */
58
59 typedef struct {
60 u_int8_t ch[4];
61 int chlen;
62 int current_endian;
63 } _UTF1632State;
64
65 typedef struct {
66 int preffered_endian;
67 unsigned int cur_max;
68 #define _ENDIAN_UNKNOWN 0
69 #define _ENDIAN_BIG 1
70 #define _ENDIAN_LITTLE 2
71 u_int32_t mode;
72 #define _MODE_UTF32 0x00000001U
73 #define _MODE_FORCE_ENDIAN 0x00000002U
74 } _UTF1632EncodingInfo;
75
76 #define _FUNCNAME(m) _citrus_UTF1632_##m
77 #define _ENCODING_INFO _UTF1632EncodingInfo
78 #define _ENCODING_STATE _UTF1632State
79 #define _ENCODING_MB_CUR_MAX(_ei_) ((_ei_)->cur_max)
80 #define _ENCODING_IS_STATE_DEPENDENT 0
81 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
82
83
84 static __inline void
85 /*ARGSUSED*/
86 _citrus_UTF1632_init_state(_UTF1632EncodingInfo *ei, _UTF1632State *s)
87 {
88 memset(s, 0, sizeof(*s));
89 }
90
91 static int
92 _citrus_UTF1632_mbrtowc_priv(_UTF1632EncodingInfo *ei, wchar_t *pwc,
93 const char **s, size_t n, _UTF1632State *psenc,
94 size_t *nresult)
95 {
96 int chlenbak, endian, needlen;
97 wchar_t wc;
98 size_t result;
99 const char *s0;
100
101 _DIAGASSERT(nresult != 0);
102 _DIAGASSERT(ei != NULL);
103 _DIAGASSERT(s != NULL);
104 _DIAGASSERT(psenc != NULL);
105
106 s0 = *s;
107
108 if (s0 == NULL) {
109 _citrus_UTF1632_init_state(ei, psenc);
110 *nresult = 0; /* state independent */
111 return (0);
112 }
113
114 result = 0;
115 chlenbak = psenc->chlen;
116
117 refetch:
118 if ((ei->mode & _MODE_UTF32) != 0 || chlenbak>=2)
119 needlen = 4;
120 else
121 needlen = 2;
122
123 while (chlenbak < needlen) {
124 if (n==0)
125 goto restart;
126 psenc->ch[chlenbak++] = *s0++;
127 n--;
128 result++;
129 }
130
131 /* judge endian marker */
132 if ((ei->mode & _MODE_UTF32) == 0) {
133 /* UTF16 */
134 if (psenc->ch[0]==0xFE && psenc->ch[1]==0xFF) {
135 psenc->current_endian = _ENDIAN_BIG;
136 chlenbak = 0;
137 goto refetch;
138 } else if (psenc->ch[0]==0xFF && psenc->ch[1]==0xFE) {
139 psenc->current_endian = _ENDIAN_LITTLE;
140 chlenbak = 0;
141 goto refetch;
142 }
143 } else {
144 /* UTF32 */
145 if (psenc->ch[0]==0x00 && psenc->ch[1]==0x00 &&
146 psenc->ch[2]==0xFE && psenc->ch[3]==0xFF) {
147 psenc->current_endian = _ENDIAN_BIG;
148 chlenbak = 0;
149 goto refetch;
150 } else if (psenc->ch[0]==0xFF && psenc->ch[1]==0xFE &&
151 psenc->ch[2]==0x00 && psenc->ch[3]==0x00) {
152 psenc->current_endian = _ENDIAN_LITTLE;
153 chlenbak = 0;
154 goto refetch;
155 }
156 }
157 if ((ei->mode & _MODE_FORCE_ENDIAN) != 0 ||
158 psenc->current_endian == _ENDIAN_UNKNOWN)
159 endian = ei->preffered_endian;
160 else
161 endian = psenc->current_endian;
162
163 /* get wc */
164 if ((ei->mode & _MODE_UTF32) == 0) {
165 /* UTF16 */
166 if (needlen==2) {
167 switch (endian) {
168 case _ENDIAN_LITTLE:
169 wc = (psenc->ch[0] |
170 ((wchar_t)psenc->ch[1] << 8));
171 break;
172 case _ENDIAN_BIG:
173 wc = (psenc->ch[1] |
174 ((wchar_t)psenc->ch[0] << 8));
175 break;
176 default:
177 goto ilseq;
178 }
179 if (wc >= 0xD800 && wc <= 0xDBFF) {
180 /* surrogate high */
181 needlen=4;
182 goto refetch;
183 }
184 } else {
185 /* surrogate low */
186 wc -= 0xD800; /* wc : surrogate high (see above) */
187 wc <<= 10;
188 switch (endian) {
189 case _ENDIAN_LITTLE:
190 if (psenc->ch[2]<0xDC || psenc->ch[2]>0xDF)
191 goto ilseq;
192 wc |= psenc->ch[2];
193 wc |= (wchar_t)(psenc->ch[3] & 3) << 8;
194 break;
195 case _ENDIAN_BIG:
196 if (psenc->ch[3]<0xDC || psenc->ch[3]>0xDF)
197 goto ilseq;
198 wc |= psenc->ch[3];
199 wc |= (wchar_t)(psenc->ch[2] & 3) << 8;
200 break;
201 default:
202 goto ilseq;
203 }
204 wc += 0x10000;
205 }
206 } else {
207 /* UTF32 */
208 switch (endian) {
209 case _ENDIAN_LITTLE:
210 wc = (psenc->ch[0] |
211 ((wchar_t)psenc->ch[1] << 8) |
212 ((wchar_t)psenc->ch[2] << 16) |
213 ((wchar_t)psenc->ch[3] << 24));
214 break;
215 case _ENDIAN_BIG:
216 wc = (psenc->ch[3] |
217 ((wchar_t)psenc->ch[2] << 8) |
218 ((wchar_t)psenc->ch[1] << 16) |
219 ((wchar_t)psenc->ch[0] << 24));
220 break;
221 default:
222 goto ilseq;
223 }
224 if (wc >= 0xD800 && wc <= 0xDFFF)
225 goto ilseq;
226 }
227
228
229 *pwc = wc;
230 psenc->chlen = 0;
231 *nresult = result;
232 *s = s0;
233
234 return (0);
235
236 ilseq:
237 *nresult = (size_t)-1;
238 psenc->chlen = 0;
239 return (EILSEQ);
240
241 restart:
242 *nresult = (size_t)-2;
243 psenc->chlen = chlenbak;
244 *s = s0;
245 return (0);
246 }
247
248 static int
249 _citrus_UTF1632_wcrtomb_priv(_UTF1632EncodingInfo *ei, char *s, size_t n,
250 wchar_t wc, _UTF1632State *psenc,
251 size_t *nresult)
252 {
253 int ret;
254 wchar_t wc2;
255
256 _DIAGASSERT(ei != NULL);
257 _DIAGASSERT(nresult != 0);
258 _DIAGASSERT(s != NULL);
259
260 wc2 = 0;
261 if ((ei->mode & _MODE_UTF32)==0) {
262 /* UTF16 */
263 if (wc>0xFFFF) {
264 /* surrogate */
265 if (wc>0x10FFFF) {
266 ret = EILSEQ;
267 goto err;
268 }
269 if (n < 4) {
270 ret = E2BIG;
271 goto err;
272 }
273 wc -= 0x10000;
274 wc2 = (wc & 0x3FF) | 0xDC00;
275 wc = (wc>>10) | 0xD800;
276 *nresult = (size_t)4;
277 } else {
278 if (n < 2) {
279 ret = E2BIG;
280 goto err;
281 }
282 *nresult = (size_t)2;
283 }
284
285 surrogate:
286 switch (ei->preffered_endian) {
287 case _ENDIAN_BIG:
288 s[1] = wc;
289 s[0] = (wc >>= 8);
290 break;
291 case _ENDIAN_LITTLE:
292 s[0] = wc;
293 s[1] = (wc >>= 8);
294 break;
295 }
296 if (wc2!=0) {
297 wc = wc2;
298 wc2 = 0;
299 s += 2;
300 goto surrogate;
301 }
302 } else {
303 /* UTF32 */
304 if (wc >= 0xD800 && wc <= 0xDFFF)
305 goto err;
306 if (n < 4) {
307 ret = E2BIG;
308 goto err;
309 }
310 switch (ei->preffered_endian) {
311 case _ENDIAN_BIG:
312 s[3] = wc;
313 s[2] = (wc >>= 8);
314 s[1] = (wc >>= 8);
315 s[0] = (wc >>= 8);
316 break;
317 case _ENDIAN_LITTLE:
318 s[0] = wc;
319 s[1] = (wc >>= 8);
320 s[2] = (wc >>= 8);
321 s[3] = (wc >>= 8);
322 break;
323 }
324 *nresult = (size_t)4;
325 }
326
327 return 0;
328
329 err:
330 *nresult = (size_t)-1;
331 return ret;
332 }
333
334 static void
335 parse_variable(_UTF1632EncodingInfo * __restrict ei,
336 const void * __restrict var, size_t lenvar)
337 {
338 #define MATCH(x, act) \
339 do { \
340 if (lenvar >= (sizeof(#x)-1) && \
341 _bcs_strncasecmp(p, #x, sizeof(#x)-1) == 0) { \
342 act; \
343 lenvar -= sizeof(#x)-1; \
344 p += sizeof(#x)-1; \
345 } \
346 } while (/*CONSTCOND*/0)
347 const char *p;
348 p = var;
349 while (lenvar>0) {
350 switch (*p) {
351 case 'B':
352 case 'b':
353 MATCH(big, ei->preffered_endian = _ENDIAN_BIG);
354 break;
355 case 'L':
356 case 'l':
357 MATCH(little, ei->preffered_endian = _ENDIAN_LITTLE);
358 break;
359 case 'F':
360 case 'f':
361 MATCH(force, ei->mode |= _MODE_FORCE_ENDIAN);
362 break;
363 case 'U':
364 case 'u':
365 MATCH(utf32, ei->mode |= _MODE_UTF32);
366 break;
367 }
368 p++;
369 lenvar--;
370 }
371 }
372
373 static int
374 /*ARGSUSED*/
375 _citrus_UTF1632_encoding_module_init(_UTF1632EncodingInfo * __restrict ei,
376 const void * __restrict var,
377 size_t lenvar)
378 {
379 _DIAGASSERT(ei != NULL);
380
381 memset((void *)ei, 0, sizeof(*ei));
382
383 parse_variable(ei, var, lenvar);
384
385 if ((ei->mode&_MODE_UTF32)==0)
386 ei->cur_max = 6; /* endian + surrogate */
387 else
388 ei->cur_max = 8; /* endian + normal */
389
390 if (ei->preffered_endian == _ENDIAN_UNKNOWN) {
391 #if BYTE_ORDER == BIG_ENDIAN
392 ei->preffered_endian = _ENDIAN_BIG;
393 #else
394 ei->preffered_endian = _ENDIAN_LITTLE;
395 #endif
396 }
397
398 return (0);
399 }
400
401 static void
402 /*ARGSUSED*/
403 _citrus_UTF1632_encoding_module_uninit(_UTF1632EncodingInfo *ei)
404 {
405 }
406
407 static __inline int
408 /*ARGSUSED*/
409 _citrus_UTF1632_stdenc_wctocs(_UTF1632EncodingInfo * __restrict ei,
410 _csid_t * __restrict csid,
411 _index_t * __restrict idx,
412 _wc_t wc)
413 {
414
415 _DIAGASSERT(csid != NULL && idx != NULL);
416
417 *csid = 0;
418 *idx = (_index_t)wc;
419
420 return (0);
421 }
422
423 static __inline int
424 /*ARGSUSED*/
425 _citrus_UTF1632_stdenc_cstowc(_UTF1632EncodingInfo * __restrict ei,
426 _wc_t * __restrict wc,
427 _csid_t csid, _index_t idx)
428 {
429
430 _DIAGASSERT(wc != NULL);
431
432 if (csid != 0)
433 return (EILSEQ);
434
435 *wc = (_wc_t)idx;
436
437 return (0);
438 }
439
440 static __inline int
441 /*ARGSUSED*/
442 _citrus_UTF1632_stdenc_get_state_desc_generic(_UTF1632EncodingInfo * __restrict ei,
443 _UTF1632State * __restrict psenc,
444 int * __restrict rstate)
445 {
446
447 if (psenc->chlen == 0)
448 *rstate = _STDENC_SDGEN_INITIAL;
449 else
450 *rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
451
452 return 0;
453 }
454
455 /* ----------------------------------------------------------------------
456 * public interface for stdenc
457 */
458
459 _CITRUS_STDENC_DECLS(UTF1632);
460 _CITRUS_STDENC_DEF_OPS(UTF1632);
461
462 #include "citrus_stdenc_template.h"
463