1 /* $FreeBSD: head/lib/libiconv_modules/UTF1632/citrus_utf1632.c 281550 2015-04-15 09:09:20Z tijl $ */
2 /* $NetBSD: citrus_utf1632.c,v 1.9 2008/06/14 16:01:08 tnozaki Exp $ */
3
4 /*-
5 * Copyright (c)2003 Citrus Project,
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 #include <sys/endian.h>
32 #include <sys/types.h>
33
34 #include <assert.h>
35 #include <errno.h>
36 #include <limits.h>
37 #include <stddef.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <wchar.h>
42
43 #include "citrus_namespace.h"
44 #include "citrus_types.h"
45 #include "citrus_module.h"
46 #include "citrus_stdenc.h"
47 #include "citrus_bcs.h"
48
49 #include "citrus_utf1632.h"
50
51
52 /* ----------------------------------------------------------------------
53 * private stuffs used by templates
54 */
55
56 typedef struct {
57 int chlen;
58 int current_endian;
59 uint8_t ch[4];
60 } _UTF1632State;
61
62 #define _ENDIAN_UNKNOWN 0
63 #define _ENDIAN_BIG 1
64 #define _ENDIAN_LITTLE 2
65 #if BYTE_ORDER == BIG_ENDIAN
66 #define _ENDIAN_INTERNAL _ENDIAN_BIG
67 #define _ENDIAN_SWAPPED _ENDIAN_LITTLE
68 #else
69 #define _ENDIAN_INTERNAL _ENDIAN_LITTLE
70 #define _ENDIAN_SWAPPED _ENDIAN_BIG
71 #endif
72 #define _MODE_UTF32 0x00000001U
73 #define _MODE_FORCE_ENDIAN 0x00000002U
74
75 typedef struct {
76 int preffered_endian;
77 unsigned int cur_max;
78 uint32_t mode;
79 } _UTF1632EncodingInfo;
80
81 #define _FUNCNAME(m) _citrus_UTF1632_##m
82 #define _ENCODING_INFO _UTF1632EncodingInfo
83 #define _ENCODING_STATE _UTF1632State
84 #define _ENCODING_MB_CUR_MAX(_ei_) ((_ei_)->cur_max)
85 #define _ENCODING_IS_STATE_DEPENDENT 0
86 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0
87
88
89 static __inline void
90 /*ARGSUSED*/
_citrus_UTF1632_init_state(_UTF1632EncodingInfo * ei __unused,_UTF1632State * s)91 _citrus_UTF1632_init_state(_UTF1632EncodingInfo *ei __unused,
92 _UTF1632State *s)
93 {
94
95 memset(s, 0, sizeof(*s));
96 }
97
98 static int
_citrus_UTF1632_mbrtowc_priv(_UTF1632EncodingInfo * ei,wchar_t * pwc,char ** s,size_t n,_UTF1632State * psenc,size_t * nresult)99 _citrus_UTF1632_mbrtowc_priv(_UTF1632EncodingInfo *ei, wchar_t *pwc,
100 char **s, size_t n, _UTF1632State *psenc, size_t *nresult)
101 {
102 char *s0;
103 size_t result;
104 wchar_t wc = L'\0';
105 int chlenbak, endian, needlen;
106
107 s0 = *s;
108
109 if (s0 == NULL) {
110 _citrus_UTF1632_init_state(ei, psenc);
111 *nresult = 0; /* state independent */
112 return (0);
113 }
114
115 result = 0;
116 chlenbak = psenc->chlen;
117
118 refetch:
119 needlen = ((ei->mode & _MODE_UTF32) != 0 || chlenbak >= 2) ? 4 : 2;
120
121 while (chlenbak < needlen) {
122 if (n == 0)
123 goto restart;
124 psenc->ch[chlenbak++] = *s0++;
125 n--;
126 result++;
127 }
128
129 /* judge endian marker */
130 if ((ei->mode & _MODE_UTF32) == 0) {
131 /* UTF16 */
132 if (psenc->ch[0] == 0xFE && psenc->ch[1] == 0xFF) {
133 psenc->current_endian = _ENDIAN_BIG;
134 chlenbak = 0;
135 goto refetch;
136 } else if (psenc->ch[0] == 0xFF && psenc->ch[1] == 0xFE) {
137 psenc->current_endian = _ENDIAN_LITTLE;
138 chlenbak = 0;
139 goto refetch;
140 }
141 } else {
142 /* UTF32 */
143 if (psenc->ch[0] == 0x00 && psenc->ch[1] == 0x00 &&
144 psenc->ch[2] == 0xFE && psenc->ch[3] == 0xFF) {
145 psenc->current_endian = _ENDIAN_BIG;
146 chlenbak = 0;
147 goto refetch;
148 } else if (psenc->ch[0] == 0xFF && psenc->ch[1] == 0xFE &&
149 psenc->ch[2] == 0x00 && psenc->ch[3] == 0x00) {
150 psenc->current_endian = _ENDIAN_LITTLE;
151 chlenbak = 0;
152 goto refetch;
153 }
154 }
155 endian = ((ei->mode & _MODE_FORCE_ENDIAN) != 0 ||
156 psenc->current_endian == _ENDIAN_UNKNOWN) ? ei->preffered_endian :
157 psenc->current_endian;
158
159 /* get wc */
160 if ((ei->mode & _MODE_UTF32) == 0) {
161 /* UTF16 */
162 if (needlen == 2) {
163 switch (endian) {
164 case _ENDIAN_LITTLE:
165 wc = (psenc->ch[0] |
166 ((wchar_t)psenc->ch[1] << 8));
167 break;
168 case _ENDIAN_BIG:
169 wc = (psenc->ch[1] |
170 ((wchar_t)psenc->ch[0] << 8));
171 break;
172 default:
173 goto ilseq;
174 }
175 if (wc >= 0xD800 && wc <= 0xDBFF) {
176 /* surrogate high */
177 needlen = 4;
178 goto refetch;
179 }
180 } else {
181 /* surrogate low */
182 wc -= 0xD800; /* wc : surrogate high (see above) */
183 wc <<= 10;
184 switch (endian) {
185 case _ENDIAN_LITTLE:
186 if (psenc->ch[3] < 0xDC || psenc->ch[3] > 0xDF)
187 goto ilseq;
188 wc |= psenc->ch[2];
189 wc |= (wchar_t)(psenc->ch[3] & 3) << 8;
190 break;
191 case _ENDIAN_BIG:
192 if (psenc->ch[2]<0xDC || psenc->ch[2]>0xDF)
193 goto ilseq;
194 wc |= psenc->ch[3];
195 wc |= (wchar_t)(psenc->ch[2] & 3) << 8;
196 break;
197 default:
198 goto ilseq;
199 }
200 wc += 0x10000;
201 }
202 } else {
203 /* UTF32 */
204 switch (endian) {
205 case _ENDIAN_LITTLE:
206 wc = (psenc->ch[0] |
207 ((wchar_t)psenc->ch[1] << 8) |
208 ((wchar_t)psenc->ch[2] << 16) |
209 ((wchar_t)psenc->ch[3] << 24));
210 break;
211 case _ENDIAN_BIG:
212 wc = (psenc->ch[3] |
213 ((wchar_t)psenc->ch[2] << 8) |
214 ((wchar_t)psenc->ch[1] << 16) |
215 ((wchar_t)psenc->ch[0] << 24));
216 break;
217 default:
218 goto ilseq;
219 }
220 if (wc >= 0xD800 && wc <= 0xDFFF)
221 goto ilseq;
222 }
223
224
225 *pwc = wc;
226 psenc->chlen = 0;
227 *nresult = result;
228 *s = s0;
229
230 return (0);
231
232 ilseq:
233 *nresult = (size_t)-1;
234 psenc->chlen = 0;
235 return (EILSEQ);
236
237 restart:
238 *nresult = (size_t)-2;
239 psenc->chlen = chlenbak;
240 *s = s0;
241 return (0);
242 }
243
244 static int
_citrus_UTF1632_wcrtomb_priv(_UTF1632EncodingInfo * ei,char * s,size_t n,wchar_t wc,_UTF1632State * psenc,size_t * nresult)245 _citrus_UTF1632_wcrtomb_priv(_UTF1632EncodingInfo *ei, char *s, size_t n,
246 wchar_t wc, _UTF1632State *psenc, size_t *nresult)
247 {
248 wchar_t wc2;
249 static const char _bom[4] = {
250 0x00, 0x00, 0xFE, 0xFF,
251 };
252 const char *bom = &_bom[0];
253 size_t cnt;
254
255 cnt = (size_t)0;
256 if (psenc->current_endian == _ENDIAN_UNKNOWN) {
257 if ((ei->mode & _MODE_FORCE_ENDIAN) == 0) {
258 if (ei->mode & _MODE_UTF32)
259 cnt = 4;
260 else {
261 cnt = 2;
262 bom += 2;
263 }
264 if (n < cnt)
265 goto e2big;
266 memcpy(s, bom, cnt);
267 s += cnt, n -= cnt;
268 }
269 psenc->current_endian = ei->preffered_endian;
270 }
271
272 wc2 = 0;
273 if ((ei->mode & _MODE_UTF32)==0) {
274 /* UTF16 */
275 if (wc > 0xFFFF) {
276 /* surrogate */
277 if (wc > 0x10FFFF)
278 goto ilseq;
279 if (n < 4)
280 goto e2big;
281 cnt += 4;
282 wc -= 0x10000;
283 wc2 = (wc & 0x3FF) | 0xDC00;
284 wc = (wc>>10) | 0xD800;
285 } else {
286 if (n < 2)
287 goto e2big;
288 cnt += 2;
289 }
290
291 surrogate:
292 switch (psenc->current_endian) {
293 case _ENDIAN_BIG:
294 s[1] = wc;
295 s[0] = (wc >>= 8);
296 break;
297 case _ENDIAN_LITTLE:
298 s[0] = wc;
299 s[1] = (wc >>= 8);
300 break;
301 }
302 if (wc2 != 0) {
303 wc = wc2;
304 wc2 = 0;
305 s += 2;
306 goto surrogate;
307 }
308 } else {
309 /* UTF32 */
310 if (wc >= 0xD800 && wc <= 0xDFFF)
311 goto ilseq;
312 if (n < 4)
313 goto e2big;
314 cnt += 4;
315 switch (psenc->current_endian) {
316 case _ENDIAN_BIG:
317 s[3] = wc;
318 s[2] = (wc >>= 8);
319 s[1] = (wc >>= 8);
320 s[0] = (wc >>= 8);
321 break;
322 case _ENDIAN_LITTLE:
323 s[0] = wc;
324 s[1] = (wc >>= 8);
325 s[2] = (wc >>= 8);
326 s[3] = (wc >>= 8);
327 break;
328 }
329 }
330 *nresult = cnt;
331
332 return (0);
333
334 ilseq:
335 *nresult = (size_t)-1;
336 return (EILSEQ);
337 e2big:
338 *nresult = (size_t)-1;
339 return (E2BIG);
340 }
341
342 static void
parse_variable(_UTF1632EncodingInfo * __restrict ei,const void * __restrict var,size_t lenvar)343 parse_variable(_UTF1632EncodingInfo * __restrict ei,
344 const void * __restrict var, size_t lenvar)
345 {
346 const char *p;
347
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 'i':
360 case 'I':
361 MATCH(internal, ei->preffered_endian = _ENDIAN_INTERNAL);
362 break;
363 case 's':
364 case 'S':
365 MATCH(swapped, ei->preffered_endian = _ENDIAN_SWAPPED);
366 break;
367 case 'F':
368 case 'f':
369 MATCH(force, ei->mode |= _MODE_FORCE_ENDIAN);
370 break;
371 case 'U':
372 case 'u':
373 MATCH(utf32, ei->mode |= _MODE_UTF32);
374 break;
375 }
376 p++;
377 lenvar--;
378 }
379 }
380
381 static int
382 /*ARGSUSED*/
_citrus_UTF1632_encoding_module_init(_UTF1632EncodingInfo * __restrict ei,const void * __restrict var,size_t lenvar)383 _citrus_UTF1632_encoding_module_init(_UTF1632EncodingInfo * __restrict ei,
384 const void * __restrict var, size_t lenvar)
385 {
386
387 memset((void *)ei, 0, sizeof(*ei));
388
389 parse_variable(ei, var, lenvar);
390
391 ei->cur_max = ((ei->mode&_MODE_UTF32) == 0) ? 6 : 8;
392 /* 6: endian + surrogate */
393 /* 8: endian + normal */
394
395 if (ei->preffered_endian == _ENDIAN_UNKNOWN) {
396 ei->preffered_endian = _ENDIAN_BIG;
397 }
398
399 return (0);
400 }
401
402 static void
403 /*ARGSUSED*/
_citrus_UTF1632_encoding_module_uninit(_UTF1632EncodingInfo * ei __unused)404 _citrus_UTF1632_encoding_module_uninit(_UTF1632EncodingInfo *ei __unused)
405 {
406
407 }
408
409 static __inline int
410 /*ARGSUSED*/
_citrus_UTF1632_stdenc_wctocs(_UTF1632EncodingInfo * __restrict ei __unused,_csid_t * __restrict csid,_index_t * __restrict idx,_wc_t wc)411 _citrus_UTF1632_stdenc_wctocs(_UTF1632EncodingInfo * __restrict ei __unused,
412 _csid_t * __restrict csid, _index_t * __restrict idx, _wc_t wc)
413 {
414
415 *csid = 0;
416 *idx = (_index_t)wc;
417
418 return (0);
419 }
420
421 static __inline int
422 /*ARGSUSED*/
_citrus_UTF1632_stdenc_cstowc(_UTF1632EncodingInfo * __restrict ei __unused,_wc_t * __restrict wc,_csid_t csid,_index_t idx)423 _citrus_UTF1632_stdenc_cstowc(_UTF1632EncodingInfo * __restrict ei __unused,
424 _wc_t * __restrict wc, _csid_t csid, _index_t idx)
425 {
426
427 if (csid != 0)
428 return (EILSEQ);
429
430 *wc = (_wc_t)idx;
431
432 return (0);
433 }
434
435 static __inline int
436 /*ARGSUSED*/
_citrus_UTF1632_stdenc_get_state_desc_generic(_UTF1632EncodingInfo * __restrict ei __unused,_UTF1632State * __restrict psenc,int * __restrict rstate)437 _citrus_UTF1632_stdenc_get_state_desc_generic(_UTF1632EncodingInfo * __restrict ei __unused,
438 _UTF1632State * __restrict psenc, int * __restrict rstate)
439 {
440
441 *rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
442 _STDENC_SDGEN_INCOMPLETE_CHAR;
443 return (0);
444 }
445
446 /* ----------------------------------------------------------------------
447 * public interface for stdenc
448 */
449
450 _CITRUS_STDENC_DECLS(UTF1632);
451 _CITRUS_STDENC_DEF_OPS(UTF1632);
452
453 #include "citrus_stdenc_template.h"
454