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citrus_utf1632.c revision 1.11 
      1 /*	$NetBSD: citrus_utf1632.c,v 1.11 2010/03/20 18:15:32 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 1.11 2010/03/20 18:15:32 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 <limits.h>
     41 #include <wchar.h>
     42 #include <sys/types.h>
     43 #include <machine/endian.h>
     44 
     45 #include "citrus_namespace.h"
     46 #include "citrus_types.h"
     47 #include "citrus_module.h"
     48 #include "citrus_stdenc.h"
     49 #include "citrus_bcs.h"
     50 
     51 #include "citrus_utf1632.h"
     52 
     53 
     54 /* ----------------------------------------------------------------------
     55  * private stuffs used by templates
     56  */
     57 
     58 typedef struct {
     59 	u_int8_t		ch[4];
     60 	int			chlen;
     61 	int			current_endian;
     62 } _UTF1632State;
     63 
     64 typedef struct {
     65 	int		preffered_endian;
     66 	unsigned int	cur_max;
     67 #define _ENDIAN_UNKNOWN	0
     68 #define _ENDIAN_BIG	1
     69 #define _ENDIAN_LITTLE	2
     70 	u_int32_t	mode;
     71 #define _MODE_UTF32		0x00000001U
     72 #define _MODE_FORCE_ENDIAN	0x00000002U
     73 } _UTF1632EncodingInfo;
     74 
     75 #define _FUNCNAME(m)			_citrus_UTF1632_##m
     76 #define _ENCODING_INFO			_UTF1632EncodingInfo
     77 #define _ENCODING_STATE			_UTF1632State
     78 #define _ENCODING_MB_CUR_MAX(_ei_)	((_ei_)->cur_max)
     79 #define _ENCODING_IS_STATE_DEPENDENT	0
     80 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_)	0
     81 
     82 
     83 static __inline void
     84 /*ARGSUSED*/
     85 _citrus_UTF1632_init_state(_UTF1632EncodingInfo *ei, _UTF1632State *s)
     86 {
     87 	memset(s, 0, sizeof(*s));
     88 }
     89 
     90 static int
     91 _citrus_UTF1632_mbrtowc_priv(_UTF1632EncodingInfo *ei, wchar_t *pwc,
     92 			     const char **s, size_t n, _UTF1632State *psenc,
     93 			     size_t *nresult)
     94 {
     95 	int chlenbak, endian, needlen;
     96 	wchar_t wc;
     97 	size_t result;
     98 	const char *s0;
     99 
    100 	_DIAGASSERT(nresult != 0);
    101 	_DIAGASSERT(ei != NULL);
    102 	_DIAGASSERT(s != NULL);
    103 	_DIAGASSERT(psenc != NULL);
    104 
    105 	s0 = *s;
    106 
    107 	if (s0 == NULL) {
    108 		_citrus_UTF1632_init_state(ei, psenc);
    109 		*nresult = 0; /* state independent */
    110 		return (0);
    111 	}
    112 
    113 	result = 0;
    114 	chlenbak = psenc->chlen;
    115 
    116 refetch:
    117 	if ((ei->mode & _MODE_UTF32) != 0 || chlenbak>=2)
    118 		needlen = 4;
    119 	else
    120 		needlen = 2;
    121 
    122 	while (chlenbak < needlen) {
    123 		if (n==0)
    124 			goto restart;
    125 		psenc->ch[chlenbak++] = *s0++;
    126 		n--;
    127 		result++;
    128 	}
    129 
    130 	if (psenc->current_endian == _ENDIAN_UNKNOWN) {
    131 		if ((ei->mode & _MODE_FORCE_ENDIAN) == 0) {
    132 			/* judge endian marker */
    133 			if ((ei->mode & _MODE_UTF32) == 0) {
    134 				/* UTF16 */
    135 				if (psenc->ch[0]==0xFE && psenc->ch[1]==0xFF) {
    136 					psenc->current_endian = _ENDIAN_BIG;
    137 					chlenbak = 0;
    138 					goto refetch;
    139 				} else if (psenc->ch[0]==0xFF && psenc->ch[1]==0xFE) {
    140 					psenc->current_endian = _ENDIAN_LITTLE;
    141 					chlenbak = 0;
    142 					goto refetch;
    143 				}
    144 			} else {
    145 				/* UTF32 */
    146 				if (psenc->ch[0]==0x00 && psenc->ch[1]==0x00 &&
    147 				    psenc->ch[2]==0xFE && psenc->ch[3]==0xFF) {
    148 					psenc->current_endian = _ENDIAN_BIG;
    149 					chlenbak = 0;
    150 					goto refetch;
    151 				} else if (psenc->ch[0]==0xFF && psenc->ch[1]==0xFE &&
    152 					   psenc->ch[2]==0x00 && psenc->ch[3]==0x00) {
    153 					psenc->current_endian = _ENDIAN_LITTLE;
    154 					chlenbak = 0;
    155 					goto refetch;
    156 				}
    157 			}
    158 		}
    159 		psenc->current_endian = ei->preffered_endian;
    160 	}
    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[3]<0xDC || psenc->ch[3]>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[2]<0xDC || psenc->ch[2]>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 	static const char _bom[4] = {
    256 #if BYTE_ORDER == BIG_ENDIAN
    257 	    0x00, 0x00, 0xFE, 0xFF,
    258 #else
    259 	    0xFF, 0xFE, 0x00, 0x00,
    260 #endif
    261 	};
    262 	const char *bom = &_bom[0];
    263 	size_t cnt;
    264 
    265 	_DIAGASSERT(ei != NULL);
    266 	_DIAGASSERT(nresult != 0);
    267 	_DIAGASSERT(s != NULL);
    268 
    269 	cnt = (size_t)0;
    270 	if (psenc->current_endian == _ENDIAN_UNKNOWN) {
    271 		if ((ei->mode & _MODE_FORCE_ENDIAN) == 0) {
    272 			if (ei->mode & _MODE_UTF32) {
    273 				cnt = 4;
    274 			} else {
    275 				cnt = 2;
    276 #if BYTE_ORDER == BIG_ENDIAN
    277 				bom += 2;
    278 #endif
    279 			}
    280 			if (n < cnt)
    281 				goto e2big;
    282 			memcpy(s, bom, cnt);
    283 			s += cnt, n -= cnt;
    284 		}
    285 		psenc->current_endian = ei->preffered_endian;
    286 	}
    287 
    288 	wc2 = 0;
    289 	if ((ei->mode & _MODE_UTF32)==0) {
    290 		/* UTF16 */
    291 		if (wc>0xFFFF) {
    292 			/* surrogate */
    293 			if (wc>0x10FFFF)
    294 				goto ilseq;
    295 			if (n < 4)
    296 				goto e2big;
    297 			cnt += 4;
    298 			wc -= 0x10000;
    299 			wc2 = (wc & 0x3FF) | 0xDC00;
    300 			wc = (wc>>10) | 0xD800;
    301 		} else {
    302 			if (n < 2)
    303 				goto e2big;
    304 			cnt += 2;
    305 		}
    306 
    307 surrogate:
    308 		switch (psenc->current_endian) {
    309 		case _ENDIAN_BIG:
    310 			s[1] = wc;
    311 			s[0] = (wc >>= 8);
    312 			break;
    313 		case _ENDIAN_LITTLE:
    314 			s[0] = wc;
    315 			s[1] = (wc >>= 8);
    316 			break;
    317 		}
    318 		if (wc2!=0) {
    319 			wc = wc2;
    320 			wc2 = 0;
    321 			s += 2;
    322 			goto surrogate;
    323 		}
    324 	} else {
    325 		/* UTF32 */
    326 		if (wc >= 0xD800 && wc <= 0xDFFF)
    327 			goto ilseq;
    328 		if (n < 4)
    329 			goto e2big;
    330 		cnt += 4;
    331 		switch (psenc->current_endian) {
    332 		case _ENDIAN_BIG:
    333 			s[3] = wc;
    334 			s[2] = (wc >>= 8);
    335 			s[1] = (wc >>= 8);
    336 			s[0] = (wc >>= 8);
    337 			break;
    338 		case _ENDIAN_LITTLE:
    339 			s[0] = wc;
    340 			s[1] = (wc >>= 8);
    341 			s[2] = (wc >>= 8);
    342 			s[3] = (wc >>= 8);
    343 			break;
    344 		}
    345 	}
    346 	*nresult = cnt;
    347 
    348 	return 0;
    349 
    350 ilseq:
    351 	*nresult = (size_t)-1;
    352 	return EILSEQ;
    353 e2big:
    354 	*nresult = (size_t)-1;
    355 	return E2BIG;
    356 }
    357 
    358 static void
    359 parse_variable(_UTF1632EncodingInfo * __restrict ei,
    360 	       const void * __restrict var, size_t lenvar)
    361 {
    362 #define MATCH(x, act)						\
    363 do {								\
    364 	if (lenvar >= (sizeof(#x)-1) &&				\
    365 	    _bcs_strncasecmp(p, #x, sizeof(#x)-1) == 0) {	\
    366 		act;						\
    367 		lenvar -= sizeof(#x)-1;				\
    368 		p += sizeof(#x)-1;				\
    369 	}							\
    370 } while (/*CONSTCOND*/0)
    371 	const char *p;
    372 	p = var;
    373 	while (lenvar>0) {
    374 		switch (*p) {
    375 		case 'B':
    376 		case 'b':
    377 			MATCH(big, ei->preffered_endian = _ENDIAN_BIG);
    378 			break;
    379 		case 'L':
    380 		case 'l':
    381 			MATCH(little, ei->preffered_endian = _ENDIAN_LITTLE);
    382 			break;
    383 		case 'F':
    384 		case 'f':
    385 			MATCH(force, ei->mode |= _MODE_FORCE_ENDIAN);
    386 			break;
    387 		case 'U':
    388 		case 'u':
    389 			MATCH(utf32, ei->mode |= _MODE_UTF32);
    390 			break;
    391 		}
    392 		p++;
    393 		lenvar--;
    394 	}
    395 }
    396 
    397 static int
    398 /*ARGSUSED*/
    399 _citrus_UTF1632_encoding_module_init(_UTF1632EncodingInfo * __restrict ei,
    400 				     const void * __restrict var,
    401 				     size_t lenvar)
    402 {
    403 	_DIAGASSERT(ei != NULL);
    404 
    405 	memset((void *)ei, 0, sizeof(*ei));
    406 
    407 	parse_variable(ei, var, lenvar);
    408 
    409 	if ((ei->mode&_MODE_UTF32)==0)
    410 		ei->cur_max = 6; /* endian + surrogate */
    411 	else
    412 		ei->cur_max = 8; /* endian + normal */
    413 
    414 	if (ei->preffered_endian == _ENDIAN_UNKNOWN) {
    415 #if BYTE_ORDER == BIG_ENDIAN
    416 		ei->preffered_endian = _ENDIAN_BIG;
    417 #else
    418 		ei->preffered_endian = _ENDIAN_LITTLE;
    419 #endif
    420 	}
    421 
    422 	return (0);
    423 }
    424 
    425 static void
    426 /*ARGSUSED*/
    427 _citrus_UTF1632_encoding_module_uninit(_UTF1632EncodingInfo *ei)
    428 {
    429 }
    430 
    431 static __inline int
    432 /*ARGSUSED*/
    433 _citrus_UTF1632_stdenc_wctocs(_UTF1632EncodingInfo * __restrict ei,
    434 			      _csid_t * __restrict csid,
    435 			      _index_t * __restrict idx,
    436 			      _wc_t wc)
    437 {
    438 
    439 	_DIAGASSERT(csid != NULL && idx != NULL);
    440 
    441 	*csid = 0;
    442 	*idx = (_index_t)wc;
    443 
    444 	return (0);
    445 }
    446 
    447 static __inline int
    448 /*ARGSUSED*/
    449 _citrus_UTF1632_stdenc_cstowc(_UTF1632EncodingInfo * __restrict ei,
    450 			      _wc_t * __restrict wc,
    451 			      _csid_t csid, _index_t idx)
    452 {
    453 
    454 	_DIAGASSERT(wc != NULL);
    455 
    456 	if (csid != 0)
    457 		return (EILSEQ);
    458 
    459 	*wc = (_wc_t)idx;
    460 
    461 	return (0);
    462 }
    463 
    464 static __inline int
    465 /*ARGSUSED*/
    466 _citrus_UTF1632_stdenc_get_state_desc_generic(_UTF1632EncodingInfo * __restrict ei,
    467 					      _UTF1632State * __restrict psenc,
    468 					      int * __restrict rstate)
    469 {
    470 
    471 	if (psenc->chlen == 0)
    472 		*rstate = _STDENC_SDGEN_INITIAL;
    473 	else
    474 		*rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
    475 
    476 	return 0;
    477 }
    478 
    479 /* ----------------------------------------------------------------------
    480  * public interface for stdenc
    481  */
    482 
    483 _CITRUS_STDENC_DECLS(UTF1632);
    484 _CITRUS_STDENC_DEF_OPS(UTF1632);
    485 
    486 #include "citrus_stdenc_template.h"
    487