lib/i18n_module/UTF7/citrus_utf7.c

   1 /* $FreeBSD: head/lib/libiconv_modules/UTF7/citrus_utf7.c 283418 2015-05-24 15:47:06Z tijl $ */
   2 /*      $NetBSD: citrus_utf7.c,v 1.5 2006/08/23 12:57:24 tnozaki Exp $  */
   3
   4 /*-
   5  * Copyright (c)2004, 2005 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 #include <sys/cdefs.h>
  32
  33 #include <assert.h>
  34 #include <errno.h>
  35 #include <limits.h>
  36 #include <stdio.h>
  37 #include <stdint.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <wchar.h>
  41
  42 #include "citrus_namespace.h"
  43 #include "citrus_types.h"
  44 #include "citrus_module.h"
  45 #include "citrus_stdenc.h"
  46 #include "citrus_utf7.h"
  47
  48 /* ----------------------------------------------------------------------
  49  * private stuffs used by templates
  50  */
  51
  52 #define EI_MASK         UINT16_C(0xff)
  53 #define EI_DIRECT       UINT16_C(0x100)
  54 #define EI_OPTION       UINT16_C(0x200)
  55 #define EI_SPACE        UINT16_C(0x400)
  56
  57 typedef struct {
  58         uint16_t         cell[0x80];
  59 } _UTF7EncodingInfo;
  60
  61 typedef struct {
  62         unsigned int
  63                 mode: 1,        /* whether base64 mode */
  64                 bits: 4,        /* need to hold 0 - 15 */
  65                 cache: 22;      /* 22 = BASE64_BIT + UTF16_BIT */
  66         int chlen;
  67         char ch[4]; /* BASE64_IN, 3 * 6 = 18, most closed to UTF16_BIT */
  68 } _UTF7State;
  69
  70 #define _CEI_TO_EI(_cei_)               (&(_cei_)->ei)
  71 #define _CEI_TO_STATE(_cei_, _func_)    (_cei_)->states.s_##_func_
  72
  73 #define _FUNCNAME(m)                    _citrus_UTF7_##m
  74 #define _ENCODING_INFO                  _UTF7EncodingInfo
  75 #define _ENCODING_STATE                 _UTF7State
  76 #define _ENCODING_MB_CUR_MAX(_ei_)              4
  77 #define _ENCODING_IS_STATE_DEPENDENT            1
  78 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_)        0
  79
  80 static __inline void
  81 /*ARGSUSED*/
  82 _citrus_UTF7_init_state(_UTF7EncodingInfo * __restrict ei __unused,
  83     _UTF7State * __restrict s)
  84 {
  85
  86         memset((void *)s, 0, sizeof(*s));
  87 }
  88
  89 #if 0
  90 static __inline void
  91 /*ARGSUSED*/
  92 _citrus_UTF7_pack_state(_UTF7EncodingInfo * __restrict ei __unused,
  93     void *__restrict pspriv, const _UTF7State * __restrict s)
  94 {
  95
  96         memcpy(pspriv, (const void *)s, sizeof(*s));
  97 }
  98
  99 static __inline void
 100 /*ARGSUSED*/
 101 _citrus_UTF7_unpack_state(_UTF7EncodingInfo * __restrict ei __unused,
 102     _UTF7State * __restrict s, const void * __restrict pspriv)
 103 {
 104
 105         memcpy((void *)s, pspriv, sizeof(*s));
 106 }
 107 #endif
 108
 109 static const char base64[] =
 110         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 111         "abcdefghijklmnopqrstuvwxyz"
 112         "0123456789+/";
 113
 114 static const char direct[] =
 115         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 116         "abcdefghijklmnopqrstuvwxyz"
 117         "0123456789'(),-./:?";
 118
 119 static const char option[] = "!\"#$%&*;<=>@[]^_`{|}";
 120 static const char spaces[] = " \t\r\n";
 121
 122 #define BASE64_BIT      6
 123 #define UTF16_BIT       16
 124
 125 #define BASE64_MAX      0x3f
 126 #define UTF16_MAX       UINT16_C(0xffff)
 127 #define UTF32_MAX       UINT32_C(0x10ffff)
 128
 129 #define BASE64_IN       '+'
 130 #define BASE64_OUT      '-'
 131
 132 #define SHIFT7BIT(c)    ((c) >> 7)
 133 #define ISSPECIAL(c)    ((c) == '\0' || (c) == BASE64_IN)
 134
 135 #define FINDLEN(ei, c) \
 136         (SHIFT7BIT((c)) ? -1 : (((ei)->cell[(c)] & EI_MASK) - 1))
 137
 138 #define ISDIRECT(ei, c) (!SHIFT7BIT((c)) && (ISSPECIAL((c)) || \
 139         ei->cell[(c)] & (EI_DIRECT | EI_OPTION | EI_SPACE)))
 140
 141 #define ISSAFE(ei, c)   (!SHIFT7BIT((c)) && (ISSPECIAL((c)) || \
 142         (c < 0x80 && ei->cell[(c)] & (EI_DIRECT | EI_SPACE))))
 143
 144 /* surrogate pair */
 145 #define SRG_BASE        UINT32_C(0x10000)
 146 #define HISRG_MIN       UINT16_C(0xd800)
 147 #define HISRG_MAX       UINT16_C(0xdbff)
 148 #define LOSRG_MIN       UINT16_C(0xdc00)
 149 #define LOSRG_MAX       UINT16_C(0xdfff)
 150
 151 static int
 152 _citrus_UTF7_mbtoutf16(_UTF7EncodingInfo * __restrict ei,
 153     uint16_t * __restrict u16, char ** __restrict s, size_t n,
 154     _UTF7State * __restrict psenc, size_t * __restrict nresult)
 155 {
 156         char *s0;
 157         int done, i, len;
 158
 159         *nresult = 0;
 160         s0 = *s;
 161
 162         for (i = 0, done = 0; done == 0; i++) {
 163                 if (i == psenc->chlen) {
 164                         if (n-- < 1) {
 165                                 *nresult = (size_t)-2;
 166                                 *s = s0;
 167                                 return (0);
 168                         }
 169                         psenc->ch[psenc->chlen++] = *s0++;
 170                 }
 171                 if (SHIFT7BIT((int)psenc->ch[i]))
 172                         goto ilseq;
 173                 if (!psenc->mode) {
 174                         if (psenc->bits > 0 || psenc->cache > 0)
 175                                 return (EINVAL);
 176                         if (psenc->ch[i] == BASE64_IN)
 177                                 psenc->mode = 1;
 178                         else {
 179                                 if (!ISDIRECT(ei, (int)psenc->ch[i]))
 180                                         goto ilseq;
 181                                 *u16 = (uint16_t)psenc->ch[i];
 182                                 done = 1;
 183                                 continue;
 184                         }
 185                 } else {
 186                         if (psenc->ch[i] == BASE64_OUT && psenc->cache == 0) {
 187                                 psenc->mode = 0;
 188                                 *u16 = (uint16_t)BASE64_IN;
 189                                 done = 1;
 190                                 continue;
 191                         }
 192                         len = FINDLEN(ei, (int)psenc->ch[i]);
 193                         if (len < 0) {
 194                                 if (psenc->bits >= BASE64_BIT)
 195                                         return (EINVAL);
 196                                 psenc->mode = 0;
 197                                 psenc->bits = psenc->cache = 0;
 198                                 if (psenc->ch[i] != BASE64_OUT) {
 199                                         if (!ISDIRECT(ei, (int)psenc->ch[i]))
 200                                                 goto ilseq;
 201                                         *u16 = (uint16_t)psenc->ch[i];
 202                                         done = 1;
 203                                 } else {
 204                                         psenc->chlen--;
 205                                         i--;
 206                                 }
 207                         } else {
 208                                 psenc->cache =
 209                                     (psenc->cache << BASE64_BIT) | len;
 210                                 switch (psenc->bits) {
 211                                 case 0: case 2: case 4: case 6: case 8:
 212                                         psenc->bits += BASE64_BIT;
 213                                         break;
 214                                 case 10: case 12: case 14:
 215                                         psenc->bits -= (UTF16_BIT - BASE64_BIT);
 216                                         *u16 = (psenc->cache >> psenc->bits) &
 217                                             UTF16_MAX;
 218                                         done = 1;
 219                                         break;
 220                                 default:
 221                                         return (EINVAL);
 222                                 }
 223                         }
 224                 }
 225         }
 226
 227         if (psenc->chlen > i)
 228                 return (EINVAL);
 229         psenc->chlen = 0;
 230         *nresult = (size_t)((*u16 == 0) ? 0 : s0 - *s);
 231         *s = s0;
 232
 233         return (0);
 234
 235 ilseq:
 236         *nresult = (size_t)-1;
 237         return (EILSEQ);
 238 }
 239
 240 static int
 241 _citrus_UTF7_mbrtowc_priv(_UTF7EncodingInfo * __restrict ei,
 242     wchar_t * __restrict pwc, char ** __restrict s, size_t n,
 243     _UTF7State * __restrict psenc, size_t * __restrict nresult)
 244 {
 245         uint32_t u32;
 246         uint16_t hi, lo;
 247         size_t nr, siz;
 248         int err;
 249
 250         if (*s == NULL) {
 251                 _citrus_UTF7_init_state(ei, psenc);
 252                 *nresult = (size_t)_ENCODING_IS_STATE_DEPENDENT;
 253                 return (0);
 254         }
 255         err = _citrus_UTF7_mbtoutf16(ei, &hi, s, n, psenc, &nr);
 256         if (nr == (size_t)-1 || nr == (size_t)-2) {
 257                 *nresult = nr;
 258                 return (err);
 259         }
 260         if (err != 0)
 261                 return (err);
 262         n -= nr;
 263         siz = nr;
 264         if (hi < HISRG_MIN || hi > HISRG_MAX) {
 265                 u32 = (uint32_t)hi;
 266                 goto done;
 267         }
 268         err = _citrus_UTF7_mbtoutf16(ei, &lo, s, n, psenc, &nr);
 269         if (nr == (size_t)-1 || nr == (size_t)-2) {
 270                 psenc->chlen = 1; /* make get_state_desc return incomplete */
 271                 *nresult = nr;
 272                 return (err);
 273         }
 274         if (err != 0)
 275                 return (err);
 276         if (lo < LOSRG_MIN || lo > LOSRG_MAX) {
 277                 *nresult = (size_t)-1;
 278                 return (EILSEQ);
 279         }
 280         hi -= HISRG_MIN;
 281         lo -= LOSRG_MIN;
 282         u32 = (hi << 10 | lo) + SRG_BASE;
 283         siz += nr;
 284 done:
 285         if (pwc != NULL)
 286                 *pwc = (wchar_t)u32;
 287         if (u32 == (uint32_t)0) {
 288                 *nresult = (size_t)0;
 289                 _citrus_UTF7_init_state(ei, psenc);
 290         } else {
 291                 *nresult = siz;
 292         }
 293         return (err);
 294 }
 295
 296 static int
 297 _citrus_UTF7_utf16tomb(_UTF7EncodingInfo * __restrict ei,
 298     char * __restrict s, size_t n __unused, uint16_t u16,
 299     _UTF7State * __restrict psenc, size_t * __restrict nresult)
 300 {
 301         int bits, i;
 302
 303         if (psenc->chlen != 0 || psenc->bits > BASE64_BIT)
 304                 return (EINVAL);
 305
 306         if (ISSAFE(ei, u16)) {
 307                 if (psenc->mode) {
 308                         if (psenc->bits > 0) {
 309                                 bits = BASE64_BIT - psenc->bits;
 310                                 i = (psenc->cache << bits) & BASE64_MAX;
 311                                 psenc->ch[psenc->chlen++] = base64[i];
 312                                 psenc->bits = psenc->cache = 0;
 313                         }
 314                         if (u16 == BASE64_OUT || FINDLEN(ei, u16) >= 0)
 315                                 psenc->ch[psenc->chlen++] = BASE64_OUT;
 316                         psenc->mode = 0;
 317                 }
 318                 if (psenc->bits != 0)
 319                         return (EINVAL);
 320                 psenc->ch[psenc->chlen++] = (char)u16;
 321                 if (u16 == BASE64_IN)
 322                         psenc->ch[psenc->chlen++] = BASE64_OUT;
 323         } else {
 324                 if (!psenc->mode) {
 325                         if (psenc->bits > 0)
 326                                 return (EINVAL);
 327                         psenc->ch[psenc->chlen++] = BASE64_IN;
 328                         psenc->mode = 1;
 329                 }
 330                 psenc->cache = (psenc->cache << UTF16_BIT) | u16;
 331                 bits = UTF16_BIT + psenc->bits;
 332                 psenc->bits = bits % BASE64_BIT;
 333                 while ((bits -= BASE64_BIT) >= 0) {
 334                         i = (psenc->cache >> bits) & BASE64_MAX;
 335                         psenc->ch[psenc->chlen++] = base64[i];
 336                 }
 337         }
 338         memcpy(s, psenc->ch, psenc->chlen);
 339         *nresult = psenc->chlen;
 340         psenc->chlen = 0;
 341
 342         return (0);
 343 }
 344
 345 static int
 346 _citrus_UTF7_wcrtomb_priv(_UTF7EncodingInfo * __restrict ei,
 347     char * __restrict s, size_t n, wchar_t wchar,
 348     _UTF7State * __restrict psenc, size_t * __restrict nresult)
 349 {
 350         uint32_t u32;
 351         uint16_t u16[2];
 352         int err, i, len;
 353         size_t nr, siz;
 354
 355         u32 = (uint32_t)wchar;
 356         if (u32 <= UTF16_MAX) {
 357                 u16[0] = (uint16_t)u32;
 358                 len = 1;
 359         } else if (u32 <= UTF32_MAX) {
 360                 u32 -= SRG_BASE;
 361                 u16[0] = (u32 >> 10) + HISRG_MIN;
 362                 u16[1] = ((uint16_t)(u32 & UINT32_C(0x3ff))) + LOSRG_MIN;
 363                 len = 2;
 364         } else {
 365                 *nresult = (size_t)-1;
 366                 return (EILSEQ);
 367         }
 368         siz = 0;
 369         for (i = 0; i < len; ++i) {
 370                 err = _citrus_UTF7_utf16tomb(ei, s, n, u16[i], psenc, &nr);
 371                 if (err != 0)
 372                         return (err); /* XXX: state has been modified */
 373                 s += nr;
 374                 n -= nr;
 375                 siz += nr;
 376         }
 377         *nresult = siz;
 378
 379         return (0);
 380 }
 381
 382 static int
 383 /* ARGSUSED */
 384 _citrus_UTF7_put_state_reset(_UTF7EncodingInfo * __restrict ei __unused,
 385     char * __restrict s, size_t n, _UTF7State * __restrict psenc,
 386     size_t * __restrict nresult)
 387 {
 388         int bits, pos;
 389
 390         if (psenc->chlen != 0 || psenc->bits > BASE64_BIT)
 391                 return (EINVAL);
 392
 393         if (psenc->mode) {
 394                 if (psenc->bits > 0) {
 395                         if (n-- < 1)
 396                                 return (E2BIG);
 397                         bits = BASE64_BIT - psenc->bits;
 398                         pos = (psenc->cache << bits) & BASE64_MAX;
 399                         psenc->ch[psenc->chlen++] = base64[pos];
 400                         psenc->ch[psenc->chlen++] = BASE64_OUT;
 401                         psenc->bits = psenc->cache = 0;
 402                 }
 403                 psenc->mode = 0;
 404         }
 405         if (psenc->bits != 0)
 406                 return (EINVAL);
 407         if (n-- < 1)
 408                 return (E2BIG);
 409
 410         *nresult = (size_t)psenc->chlen;
 411         if (psenc->chlen > 0) {
 412                 memcpy(s, psenc->ch, psenc->chlen);
 413                 psenc->chlen = 0;
 414         }
 415
 416         return (0);
 417 }
 418
 419 static __inline int
 420 /*ARGSUSED*/
 421 _citrus_UTF7_stdenc_wctocs(_UTF7EncodingInfo * __restrict ei __unused,
 422     _csid_t * __restrict csid, _index_t * __restrict idx, wchar_t wc)
 423 {
 424
 425         *csid = 0;
 426         *idx = (_index_t)wc;
 427
 428         return (0);
 429 }
 430
 431 static __inline int
 432 /*ARGSUSED*/
 433 _citrus_UTF7_stdenc_cstowc(_UTF7EncodingInfo * __restrict ei __unused,
 434     wchar_t * __restrict wc, _csid_t csid, _index_t idx)
 435 {
 436
 437         if (csid != 0)
 438                 return (EILSEQ);
 439         *wc = (wchar_t)idx;
 440
 441         return (0);
 442 }
 443
 444 static __inline int
 445 /*ARGSUSED*/
 446 _citrus_UTF7_stdenc_get_state_desc_generic(_UTF7EncodingInfo * __restrict ei __unused,
 447     _UTF7State * __restrict psenc, int * __restrict rstate)
 448 {
 449
 450         *rstate = (psenc->chlen == 0) ? _STDENC_SDGEN_INITIAL :
 451             _STDENC_SDGEN_INCOMPLETE_CHAR;
 452         return (0);
 453 }
 454
 455 static void
 456 /*ARGSUSED*/
 457 _citrus_UTF7_encoding_module_uninit(_UTF7EncodingInfo *ei __unused)
 458 {
 459
 460         /* ei seems to be unused */
 461 }
 462
 463 static int
 464 /*ARGSUSED*/
 465 _citrus_UTF7_encoding_module_init(_UTF7EncodingInfo * __restrict ei,
 466     const void * __restrict var __unused, size_t lenvar __unused)
 467 {
 468         const char *s;
 469
 470         memset(ei, 0, sizeof(*ei));
 471
 472 #define FILL(str, flag)                         \
 473 do {                                            \
 474         for (s = str; *s != '\0'; s++)          \
 475                 ei->cell[*s & 0x7f] |= flag;    \
 476 } while (/*CONSTCOND*/0)
 477
 478         FILL(base64, (s - base64) + 1);
 479         FILL(direct, EI_DIRECT);
 480         FILL(option, EI_OPTION);
 481         FILL(spaces, EI_SPACE);
 482
 483         return (0);
 484 }
 485
 486 /* ----------------------------------------------------------------------
 487  * public interface for stdenc
 488  */
 489
 490 _CITRUS_STDENC_DECLS(UTF7);
 491 _CITRUS_STDENC_DEF_OPS(UTF7);
 492
 493 #include "citrus_stdenc_template.h"