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citrus_utf1632.c revision 1.4 
      1 /*	$NetBSD: citrus_utf1632.c,v 1.4 2005/10/29 18:02:04 tshiozak 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 1.4 2005/10/29 18:02:04 tshiozak 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 <sys/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 			}
    177 			if (wc >= 0xD800 && wc <= 0xDBFF) {
    178 				/* surrogate high */
    179 				needlen=4;
    180 				goto refetch;
    181 			}
    182 		} else {
    183 			/* surrogate low */
    184 			wc -= 0xD800; /* wc : surrogate high (see above) */
    185 			wc <<= 10;
    186 			switch (endian) {
    187 			case _ENDIAN_LITTLE:
    188 				if (psenc->ch[2]<0xDC || psenc->ch[2]>0xDF)
    189 					goto ilseq;
    190 				wc |= psenc->ch[2];
    191 				wc |= (wchar_t)(psenc->ch[3] & 3) << 8;
    192 				break;
    193 			case _ENDIAN_BIG:
    194 				if (psenc->ch[3]<0xDC || psenc->ch[3]>0xDF)
    195 					goto ilseq;
    196 				wc |= psenc->ch[3];
    197 				wc |= (wchar_t)(psenc->ch[2] & 3) << 8;
    198 				break;
    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 		}
    218 	}
    219 
    220 
    221 	*pwc = wc;
    222 	psenc->chlen = 0;
    223 	*nresult = result;
    224 	*s = s0;
    225 
    226 	return (0);
    227 
    228 ilseq:
    229 	*nresult = (size_t)-1;
    230 	psenc->chlen = 0;
    231 	return (EILSEQ);
    232 
    233 restart:
    234 	*nresult = (size_t)-2;
    235 	psenc->chlen = chlenbak;
    236 	*s = s0;
    237 	return (0);
    238 }
    239 
    240 static int
    241 _citrus_UTF1632_wcrtomb_priv(_UTF1632EncodingInfo *ei, char *s, size_t n,
    242 			     wchar_t wc, _UTF1632State *psenc,
    243 			     size_t *nresult)
    244 {
    245 	int ret;
    246 	wchar_t wc2;
    247 
    248 	_DIAGASSERT(ei != NULL);
    249 	_DIAGASSERT(nresult != 0);
    250 	_DIAGASSERT(s != NULL);
    251 
    252 	wc2 = 0;
    253 	if ((ei->mode & _MODE_UTF32)==0) {
    254 		/* UTF16 */
    255 		if (wc>0xFFFF) {
    256 			/* surrogate */
    257 			if (wc>0x10FFFF) {
    258 				ret = EILSEQ;
    259 				goto err;
    260 			}
    261 			if (n < 4) {
    262 				ret = E2BIG;
    263 				goto err;
    264 			}
    265 			wc -= 0x10000;
    266 			wc2 = (wc & 0x3FF) | 0xDC00;
    267 			wc = (wc>>10) | 0xD800;
    268 			*nresult = (size_t)4;
    269 		} else {
    270 			if (n < 2) {
    271 				ret = E2BIG;
    272 				goto err;
    273 			}
    274 			*nresult = (size_t)2;
    275 		}
    276 
    277 surrogate:
    278 		switch (ei->preffered_endian) {
    279 		case _ENDIAN_BIG:
    280 			s[1] = wc;
    281 			s[0] = (wc >>= 8);
    282 			break;
    283 		case _ENDIAN_LITTLE:
    284 			s[0] = wc;
    285 			s[1] = (wc >>= 8);
    286 			break;
    287 		}
    288 		if (wc2!=0) {
    289 			wc = wc2;
    290 			wc2 = 0;
    291 			s += 2;
    292 			goto surrogate;
    293 		}
    294 	} else {
    295 		/* UTF32 */
    296 		if (n < 4) {
    297 			ret = E2BIG;
    298 			goto err;
    299 		}
    300 		switch (ei->preffered_endian) {
    301 		case _ENDIAN_BIG:
    302 			s[3] = wc;
    303 			s[2] = (wc >>= 8);
    304 			s[1] = (wc >>= 8);
    305 			s[0] = (wc >>= 8);
    306 			break;
    307 		case _ENDIAN_LITTLE:
    308 			s[0] = wc;
    309 			s[1] = (wc >>= 8);
    310 			s[2] = (wc >>= 8);
    311 			s[3] = (wc >>= 8);
    312 			break;
    313 		}
    314 		*nresult = (size_t)4;
    315 	}
    316 
    317 	return 0;
    318 
    319 err:
    320 	*nresult = (size_t)-1;
    321 	return ret;
    322 }
    323 
    324 static void
    325 parse_variable(_UTF1632EncodingInfo * __restrict ei,
    326 	       const void * __restrict var, size_t lenvar)
    327 {
    328 #define MATCH(x, act)						\
    329 do {								\
    330 	if (lenvar >= (sizeof(#x)-1) &&				\
    331 	    _bcs_strncasecmp(p, #x, sizeof(#x)-1) == 0) {	\
    332 		act;						\
    333 		lenvar -= sizeof(#x)-1;				\
    334 		p += sizeof(#x)-1;				\
    335 	}							\
    336 } while (/*CONSTCOND*/0)
    337 	const char *p;
    338 	p = var;
    339 	while (lenvar>0) {
    340 		switch (*p) {
    341 		case 'B':
    342 		case 'b':
    343 			MATCH(big, ei->preffered_endian = _ENDIAN_BIG);
    344 			break;
    345 		case 'L':
    346 		case 'l':
    347 			MATCH(little, ei->preffered_endian = _ENDIAN_LITTLE);
    348 			break;
    349 		case 'F':
    350 		case 'f':
    351 			MATCH(force, ei->mode |= _MODE_FORCE_ENDIAN);
    352 			break;
    353 		case 'U':
    354 		case 'u':
    355 			MATCH(utf32, ei->mode |= _MODE_UTF32);
    356 			break;
    357 		}
    358 		p++;
    359 		lenvar--;
    360 	}
    361 }
    362 
    363 static int
    364 /*ARGSUSED*/
    365 _citrus_UTF1632_encoding_module_init(_UTF1632EncodingInfo * __restrict ei,
    366 				     const void * __restrict var,
    367 				     size_t lenvar)
    368 {
    369 	_DIAGASSERT(ei != NULL);
    370 
    371 	memset((void *)ei, 0, sizeof(*ei));
    372 
    373 	parse_variable(ei, var, lenvar);
    374 
    375 	if ((ei->mode&_MODE_UTF32)==0)
    376 		ei->cur_max = 6; /* endian + surrogate */
    377 	else
    378 		ei->cur_max = 8; /* endian + normal */
    379 
    380 	if (ei->preffered_endian == _ENDIAN_UNKNOWN) {
    381 #if BYTE_ORDER == BIG_ENDIAN
    382 		ei->preffered_endian = _ENDIAN_BIG;
    383 #else
    384 		ei->preffered_endian = _ENDIAN_LITTLE;
    385 #endif
    386 	}
    387 
    388 	return (0);
    389 }
    390 
    391 static void
    392 /*ARGSUSED*/
    393 _citrus_UTF1632_encoding_module_uninit(_UTF1632EncodingInfo *ei)
    394 {
    395 }
    396 
    397 static __inline int
    398 /*ARGSUSED*/
    399 _citrus_UTF1632_stdenc_wctocs(_UTF1632EncodingInfo * __restrict ei,
    400 			      _csid_t * __restrict csid,
    401 			      _index_t * __restrict idx,
    402 			      _wc_t wc)
    403 {
    404 
    405 	_DIAGASSERT(csid != NULL && idx != NULL);
    406 
    407 	*csid = 0;
    408 	*idx = (_index_t)wc;
    409 
    410 	return (0);
    411 }
    412 
    413 static __inline int
    414 /*ARGSUSED*/
    415 _citrus_UTF1632_stdenc_cstowc(_UTF1632EncodingInfo * __restrict ei,
    416 			      _wc_t * __restrict wc,
    417 			      _csid_t csid, _index_t idx)
    418 {
    419 
    420 	_DIAGASSERT(wc != NULL);
    421 
    422 	if (csid != 0)
    423 		return (EILSEQ);
    424 
    425 	*wc = (_wc_t)idx;
    426 
    427 	return (0);
    428 }
    429 
    430 static __inline int
    431 /*ARGSUSED*/
    432 _citrus_UTF1632_stdenc_get_state_desc_generic(_UTF1632EncodingInfo * __restrict ei,
    433 					      _UTF1632State * __restrict psenc,
    434 					      int * __restrict rstate)
    435 {
    436 
    437 	if (psenc->chlen == 0)
    438 		*rstate = _STDENC_SDGEN_INITIAL;
    439 	else
    440 		*rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
    441 
    442 	return 0;
    443 }
    444 
    445 /* ----------------------------------------------------------------------
    446  * public interface for stdenc
    447  */
    448 
    449 _CITRUS_STDENC_DECLS(UTF1632);
    450 _CITRUS_STDENC_DEF_OPS(UTF1632);
    451 
    452 #include "citrus_stdenc_template.h"
    453