lib/i18n_module/UTF8/citrus_utf8.c

   1 /* $FreeBSD: head/lib/libiconv_modules/UTF8/citrus_utf8.c 281550 2015-04-15 09:09:20Z tijl $ */
   2 /*      $NetBSD: citrus_utf8.c,v 1.17 2008/06/14 16:01:08 tnozaki Exp $ */
   3
   4 /*-
   5  * Copyright (c)2002 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 /*-
  31  * Copyright (c) 1993
  32  *      The Regents of the University of California.  All rights reserved.
  33  *
  34  * This code is derived from software contributed to Berkeley by
  35  * Paul Borman at Krystal Technologies.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  */
  61
  62 #include <sys/cdefs.h>
  63 #include <sys/types.h>
  64
  65 #include <assert.h>
  66 #include <errno.h>
  67 #include <limits.h>
  68 #include <stdbool.h>
  69 #include <stddef.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #include <wchar.h>
  74
  75 #include "citrus_namespace.h"
  76 #include "citrus_types.h"
  77 #include "citrus_module.h"
  78 #include "citrus_stdenc.h"
  79 #include "citrus_utf8.h"
  80
  81
  82 /* ----------------------------------------------------------------------
  83  * private stuffs used by templates
  84  */
  85
  86 static uint8_t _UTF8_count_array[256] = {
  87         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 00 - 0F */
  88         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 10 - 1F */
  89         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 20 - 2F */
  90         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 30 - 3F */
  91         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 40 - 4F */
  92         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 50 - 5F */
  93         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 60 - 6F */
  94         1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 70 - 7F */
  95         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 80 - 8F */
  96         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 90 - 9F */
  97         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* A0 - AF */
  98         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* B0 - BF */
  99         2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* C0 - CF */
 100         2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* D0 - DF */
 101         3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* E0 - EF */
 102         4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 0, 0  /* F0 - FF */
 103 };
 104
 105 static uint8_t const *_UTF8_count = _UTF8_count_array;
 106
 107 static const uint32_t _UTF8_range[] = {
 108         0,      /*dummy*/
 109         0x00000000, 0x00000080, 0x00000800, 0x00010000,
 110         0x00200000, 0x04000000, 0x80000000,
 111 };
 112
 113 typedef struct {
 114         int      chlen;
 115         char     ch[6];
 116 } _UTF8State;
 117
 118 typedef void *_UTF8EncodingInfo;
 119
 120 #define _CEI_TO_EI(_cei_)               (&(_cei_)->ei)
 121 #define _CEI_TO_STATE(_ei_, _func_)     (_ei_)->states.s_##_func_
 122
 123 #define _FUNCNAME(m)                    _citrus_UTF8_##m
 124 #define _ENCODING_INFO                  _UTF8EncodingInfo
 125 #define _ENCODING_STATE                 _UTF8State
 126 #define _ENCODING_MB_CUR_MAX(_ei_)      6
 127 #define _ENCODING_IS_STATE_DEPENDENT    0
 128 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_)        0
 129
 130 static size_t
 131 _UTF8_findlen(wchar_t v)
 132 {
 133         size_t i;
 134         uint32_t c;
 135
 136         c = (uint32_t)v;        /*XXX*/
 137         for (i = 1; i < sizeof(_UTF8_range) / sizeof(_UTF8_range[0]) - 1; i++)
 138                 if (c >= _UTF8_range[i] && c < _UTF8_range[i + 1])
 139                         return (i);
 140
 141         return (-1);    /*out of range*/
 142 }
 143
 144 static __inline bool
 145 _UTF8_surrogate(wchar_t wc)
 146 {
 147
 148         return (wc >= 0xd800 && wc <= 0xdfff);
 149 }
 150
 151 static __inline void
 152 /*ARGSUSED*/
 153 _citrus_UTF8_init_state(_UTF8EncodingInfo *ei __unused, _UTF8State *s)
 154 {
 155
 156         s->chlen = 0;
 157 }
 158
 159 #if 0
 160 static __inline void
 161 /*ARGSUSED*/
 162 _citrus_UTF8_pack_state(_UTF8EncodingInfo *ei __unused, void *pspriv,
 163     const _UTF8State *s)
 164 {
 165
 166         memcpy(pspriv, (const void *)s, sizeof(*s));
 167 }
 168
 169 static __inline void
 170 /*ARGSUSED*/
 171 _citrus_UTF8_unpack_state(_UTF8EncodingInfo *ei __unused, _UTF8State *s,
 172     const void *pspriv)
 173 {
 174
 175         memcpy((void *)s, pspriv, sizeof(*s));
 176 }
 177 #endif
 178
 179 static int
 180 _citrus_UTF8_mbrtowc_priv(_UTF8EncodingInfo *ei, wchar_t *pwc, char **s,
 181     size_t n, _UTF8State *psenc, size_t *nresult)
 182 {
 183         char *s0;
 184         wchar_t wchar;
 185         int i;
 186         uint8_t c;
 187
 188         s0 = *s;
 189
 190         if (s0 == NULL) {
 191                 _citrus_UTF8_init_state(ei, psenc);
 192                 *nresult = 0; /* state independent */
 193                 return (0);
 194         }
 195
 196         /* make sure we have the first byte in the buffer */
 197         if (psenc->chlen == 0) {
 198                 if (n-- < 1)
 199                         goto restart;
 200                 psenc->ch[psenc->chlen++] = *s0++;
 201         }
 202
 203         c = _UTF8_count[psenc->ch[0] & 0xff];
 204         if (c < 1 || c < psenc->chlen)
 205                 goto ilseq;
 206
 207         if (c == 1)
 208                 wchar = psenc->ch[0] & 0xff;
 209         else {
 210                 while (psenc->chlen < c) {
 211                         if (n-- < 1)
 212                                 goto restart;
 213                         psenc->ch[psenc->chlen++] = *s0++;
 214                 }
 215                 wchar = psenc->ch[0] & (0x7f >> c);
 216                 for (i = 1; i < c; i++) {
 217                         if ((psenc->ch[i] & 0xc0) != 0x80)
 218                                 goto ilseq;
 219                         wchar <<= 6;
 220                         wchar |= (psenc->ch[i] & 0x3f);
 221                 }
 222                 if (_UTF8_surrogate(wchar) || _UTF8_findlen(wchar) != c)
 223                         goto ilseq;
 224         }
 225         if (pwc != NULL)
 226                 *pwc = wchar;
 227         *nresult = (wchar == 0) ? 0 : s0 - *s;
 228         *s = s0;
 229         psenc->chlen = 0;
 230
 231         return (0);
 232
 233 ilseq:
 234         *nresult = (size_t)-1;
 235         return (EILSEQ);
 236
 237 restart:
 238         *s = s0;
 239         *nresult = (size_t)-2;
 240         return (0);
 241 }
 242
 243 static int
 244 _citrus_UTF8_wcrtomb_priv(_UTF8EncodingInfo *ei __unused, char *s, size_t n,
 245     wchar_t wc, _UTF8State *psenc __unused, size_t *nresult)
 246 {
 247         wchar_t c;
 248         size_t cnt;
 249         int i, ret;
 250
 251         if (_UTF8_surrogate(wc)) {
 252                 ret = EILSEQ;
 253                 goto err;
 254         }
 255         cnt = _UTF8_findlen(wc);
 256         if (cnt <= 0 || cnt > 6) {
 257                 /* invalid UCS4 value */
 258                 ret = EILSEQ;
 259                 goto err;
 260         }
 261         if (n < cnt) {
 262                 /* bound check failure */
 263                 ret = E2BIG;
 264                 goto err;
 265         }
 266
 267         c = wc;
 268         if (s) {
 269                 for (i = cnt - 1; i > 0; i--) {
 270                         s[i] = 0x80 | (c & 0x3f);
 271                         c >>= 6;
 272                 }
 273                 s[0] = c;
 274                 if (cnt == 1)
 275                         s[0] &= 0x7f;
 276                 else {
 277                         s[0] &= (0x7f >> cnt);
 278                         s[0] |= ((0xff00 >> cnt) & 0xff);
 279                 }
 280         }
 281
 282         *nresult = (size_t)cnt;
 283         return (0);
 284
 285 err:
 286         *nresult = (size_t)-1;
 287         return (ret);
 288 }
 289
 290 static __inline int
 291 /*ARGSUSED*/
 292 _citrus_UTF8_stdenc_wctocs(_UTF8EncodingInfo * __restrict ei __unused,
 293     _csid_t * __restrict csid, _index_t * __restrict idx,
 294     wchar_t wc)
 295 {
 296
 297         *csid = 0;
 298         *idx = (_citrus_index_t)wc;
 299
 300         return (0);
 301 }
 302
 303 static __inline int
 304 /*ARGSUSED*/
 305 _citrus_UTF8_stdenc_cstowc(_UTF8EncodingInfo * __restrict ei __unused,
 306     wchar_t * __restrict wc, _csid_t csid, _index_t idx)
 307 {
 308
 309         if (csid != 0)
 310                 return (EILSEQ);
 311
 312         *wc = (wchar_t)idx;
 313
 314         return (0);
 315 }
 316
 317 static __inline int
 318 /*ARGSUSED*/
 319 _citrus_UTF8_stdenc_get_state_desc_generic(_UTF8EncodingInfo * __restrict ei __unused,
 320     _UTF8State * __restrict psenc, int * __restrict rstate)
 321 {
 322
 323         *rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
 324             _STDENC_SDGEN_INCOMPLETE_CHAR;
 325         return (0);
 326 }
 327
 328 static int
 329 /*ARGSUSED*/
 330 _citrus_UTF8_encoding_module_init(_UTF8EncodingInfo * __restrict ei __unused,
 331     const void * __restrict var __unused, size_t lenvar __unused)
 332 {
 333
 334         return (0);
 335 }
 336
 337 static void
 338 /*ARGSUSED*/
 339 _citrus_UTF8_encoding_module_uninit(_UTF8EncodingInfo *ei __unused)
 340 {
 341
 342 }
 343
 344 /* ----------------------------------------------------------------------
 345  * public interface for stdenc
 346  */
 347
 348 _CITRUS_STDENC_DECLS(UTF8);
 349 _CITRUS_STDENC_DEF_OPS(UTF8);
 350
 351 #include "citrus_stdenc_template.h"