lib/iconv.c

   1 /* Character set conversion.
   2    Copyright (C) 1999-2001, 2007, 2009-2014 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License along
  15    with this program; if not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #include <iconv.h>
  21
  22 #include <stddef.h>
  23
  24 #if REPLACE_ICONV_UTF
  25 # include <errno.h>
  26 # include <stdint.h>
  27 # include <stdlib.h>
  28 # include "unistr.h"
  29 # ifndef uintptr_t
  30 #  define uintptr_t unsigned long
  31 # endif
  32 #endif
  33
  34 #if REPLACE_ICONV_UTF
  35
  36 /* UTF-{16,32}{BE,LE} converters taken from GNU libiconv 1.11.  */
  37
  38 /* Return code if invalid. (xxx_mbtowc) */
  39 # define RET_ILSEQ      -1
  40 /* Return code if no bytes were read. (xxx_mbtowc) */
  41 # define RET_TOOFEW     -2
  42
  43 /* Return code if invalid. (xxx_wctomb) */
  44 # define RET_ILUNI      -1
  45 /* Return code if output buffer is too small. (xxx_wctomb, xxx_reset) */
  46 # define RET_TOOSMALL   -2
  47
  48 /*
  49  * UTF-16BE
  50  */
  51
  52 /* Specification: RFC 2781 */
  53
  54 static int
  55 utf16be_mbtowc (ucs4_t *pwc, const unsigned char *s, size_t n)
  56 {
  57   if (n >= 2)
  58     {
  59       ucs4_t wc = (s[0] << 8) + s[1];
  60       if (wc >= 0xd800 && wc < 0xdc00)
  61         {
  62           if (n >= 4)
  63             {
  64               ucs4_t wc2 = (s[2] << 8) + s[3];
  65               if (!(wc2 >= 0xdc00 && wc2 < 0xe000))
  66                 return RET_ILSEQ;
  67               *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00);
  68               return 4;
  69             }
  70         }
  71       else if (wc >= 0xdc00 && wc < 0xe000)
  72         {
  73           return RET_ILSEQ;
  74         }
  75       else
  76         {
  77           *pwc = wc;
  78           return 2;
  79         }
  80     }
  81   return RET_TOOFEW;
  82 }
  83
  84 static int
  85 utf16be_wctomb (unsigned char *r, ucs4_t wc, size_t n)
  86 {
  87   if (!(wc >= 0xd800 && wc < 0xe000))
  88     {
  89       if (wc < 0x10000)
  90         {
  91           if (n >= 2)
  92             {
  93               r[0] = (unsigned char) (wc >> 8);
  94               r[1] = (unsigned char) wc;
  95               return 2;
  96             }
  97           else
  98             return RET_TOOSMALL;
  99         }
 100       else if (wc < 0x110000)
 101         {
 102           if (n >= 4)
 103             {
 104               ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10);
 105               ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
 106               r[0] = (unsigned char) (wc1 >> 8);
 107               r[1] = (unsigned char) wc1;
 108               r[2] = (unsigned char) (wc2 >> 8);
 109               r[3] = (unsigned char) wc2;
 110               return 4;
 111             }
 112           else
 113             return RET_TOOSMALL;
 114         }
 115     }
 116   return RET_ILUNI;
 117 }
 118
 119 /*
 120  * UTF-16LE
 121  */
 122
 123 /* Specification: RFC 2781 */
 124
 125 static int
 126 utf16le_mbtowc (ucs4_t *pwc, const unsigned char *s, size_t n)
 127 {
 128   if (n >= 2)
 129     {
 130       ucs4_t wc = s[0] + (s[1] << 8);
 131       if (wc >= 0xd800 && wc < 0xdc00)
 132         {
 133           if (n >= 4)
 134             {
 135               ucs4_t wc2 = s[2] + (s[3] << 8);
 136               if (!(wc2 >= 0xdc00 && wc2 < 0xe000))
 137                 return RET_ILSEQ;
 138               *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00);
 139               return 4;
 140             }
 141         }
 142       else if (wc >= 0xdc00 && wc < 0xe000)
 143         {
 144           return RET_ILSEQ;
 145         }
 146       else
 147         {
 148           *pwc = wc;
 149           return 2;
 150         }
 151     }
 152   return RET_TOOFEW;
 153 }
 154
 155 static int
 156 utf16le_wctomb (unsigned char *r, ucs4_t wc, size_t n)
 157 {
 158   if (!(wc >= 0xd800 && wc < 0xe000))
 159     {
 160       if (wc < 0x10000)
 161         {
 162           if (n >= 2)
 163             {
 164               r[0] = (unsigned char) wc;
 165               r[1] = (unsigned char) (wc >> 8);
 166               return 2;
 167             }
 168           else
 169             return RET_TOOSMALL;
 170         }
 171       else if (wc < 0x110000)
 172         {
 173           if (n >= 4)
 174             {
 175               ucs4_t wc1 = 0xd800 + ((wc - 0x10000) >> 10);
 176               ucs4_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff);
 177               r[0] = (unsigned char) wc1;
 178               r[1] = (unsigned char) (wc1 >> 8);
 179               r[2] = (unsigned char) wc2;
 180               r[3] = (unsigned char) (wc2 >> 8);
 181               return 4;
 182             }
 183           else
 184             return RET_TOOSMALL;
 185         }
 186     }
 187   return RET_ILUNI;
 188 }
 189
 190 /*
 191  * UTF-32BE
 192  */
 193
 194 /* Specification: Unicode 3.1 Standard Annex #19 */
 195
 196 static int
 197 utf32be_mbtowc (ucs4_t *pwc, const unsigned char *s, size_t n)
 198 {
 199   if (n >= 4)
 200     {
 201       ucs4_t wc = (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3];
 202       if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000))
 203         {
 204           *pwc = wc;
 205           return 4;
 206         }
 207       else
 208         return RET_ILSEQ;
 209     }
 210   return RET_TOOFEW;
 211 }
 212
 213 static int
 214 utf32be_wctomb (unsigned char *r, ucs4_t wc, size_t n)
 215 {
 216   if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000))
 217     {
 218       if (n >= 4)
 219         {
 220           r[0] = 0;
 221           r[1] = (unsigned char) (wc >> 16);
 222           r[2] = (unsigned char) (wc >> 8);
 223           r[3] = (unsigned char) wc;
 224           return 4;
 225         }
 226       else
 227         return RET_TOOSMALL;
 228     }
 229   return RET_ILUNI;
 230 }
 231
 232 /*
 233  * UTF-32LE
 234  */
 235
 236 /* Specification: Unicode 3.1 Standard Annex #19 */
 237
 238 static int
 239 utf32le_mbtowc (ucs4_t *pwc, const unsigned char *s, size_t n)
 240 {
 241   if (n >= 4)
 242     {
 243       ucs4_t wc = s[0] + (s[1] << 8) + (s[2] << 16) + (s[3] << 24);
 244       if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000))
 245         {
 246           *pwc = wc;
 247           return 4;
 248         }
 249       else
 250         return RET_ILSEQ;
 251     }
 252   return RET_TOOFEW;
 253 }
 254
 255 static int
 256 utf32le_wctomb (unsigned char *r, ucs4_t wc, size_t n)
 257 {
 258   if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000))
 259     {
 260       if (n >= 4)
 261         {
 262           r[0] = (unsigned char) wc;
 263           r[1] = (unsigned char) (wc >> 8);
 264           r[2] = (unsigned char) (wc >> 16);
 265           r[3] = 0;
 266           return 4;
 267         }
 268       else
 269         return RET_TOOSMALL;
 270     }
 271   return RET_ILUNI;
 272 }
 273
 274 #endif
 275
 276 size_t
 277 rpl_iconv (iconv_t cd,
 278            ICONV_CONST char **inbuf, size_t *inbytesleft,
 279            char **outbuf, size_t *outbytesleft)
 280 #undef iconv
 281 {
 282 #if REPLACE_ICONV_UTF
 283   switch ((uintptr_t) cd)
 284     {
 285       {
 286         int (*xxx_wctomb) (unsigned char *, ucs4_t, size_t);
 287
 288         case (uintptr_t) _ICONV_UTF8_UTF16BE:
 289           xxx_wctomb = utf16be_wctomb;
 290           goto loop_from_utf8;
 291         case (uintptr_t) _ICONV_UTF8_UTF16LE:
 292           xxx_wctomb = utf16le_wctomb;
 293           goto loop_from_utf8;
 294         case (uintptr_t) _ICONV_UTF8_UTF32BE:
 295           xxx_wctomb = utf32be_wctomb;
 296           goto loop_from_utf8;
 297         case (uintptr_t) _ICONV_UTF8_UTF32LE:
 298           xxx_wctomb = utf32le_wctomb;
 299           goto loop_from_utf8;
 300
 301        loop_from_utf8:
 302         if (inbuf == NULL || *inbuf == NULL)
 303           return 0;
 304         {
 305           ICONV_CONST char *inptr = *inbuf;
 306           size_t inleft = *inbytesleft;
 307           char *outptr = *outbuf;
 308           size_t outleft = *outbytesleft;
 309           size_t res = 0;
 310           while (inleft > 0)
 311             {
 312               ucs4_t uc;
 313               int m = u8_mbtoucr (&uc, (const uint8_t *) inptr, inleft);
 314               if (m <= 0)
 315                 {
 316                   if (m == -1)
 317                     {
 318                       errno = EILSEQ;
 319                       res = (size_t)(-1);
 320                       break;
 321                     }
 322                   if (m == -2)
 323                     {
 324                       errno = EINVAL;
 325                       res = (size_t)(-1);
 326                       break;
 327                     }
 328                   abort ();
 329                 }
 330               else
 331                 {
 332                   int n = xxx_wctomb ((uint8_t *) outptr, uc, outleft);
 333                   if (n < 0)
 334                     {
 335                       if (n == RET_ILUNI)
 336                         {
 337                           errno = EILSEQ;
 338                           res = (size_t)(-1);
 339                           break;
 340                         }
 341                       if (n == RET_TOOSMALL)
 342                         {
 343                           errno = E2BIG;
 344                           res = (size_t)(-1);
 345                           break;
 346                         }
 347                       abort ();
 348                     }
 349                   else
 350                     {
 351                       inptr += m;
 352                       inleft -= m;
 353                       outptr += n;
 354                       outleft -= n;
 355                     }
 356                 }
 357             }
 358           *inbuf = inptr;
 359           *inbytesleft = inleft;
 360           *outbuf = outptr;
 361           *outbytesleft = outleft;
 362           return res;
 363         }
 364       }
 365
 366       {
 367         int (*xxx_mbtowc) (ucs4_t *, const unsigned char *, size_t);
 368
 369         case (uintptr_t) _ICONV_UTF16BE_UTF8:
 370           xxx_mbtowc = utf16be_mbtowc;
 371           goto loop_to_utf8;
 372         case (uintptr_t) _ICONV_UTF16LE_UTF8:
 373           xxx_mbtowc = utf16le_mbtowc;
 374           goto loop_to_utf8;
 375         case (uintptr_t) _ICONV_UTF32BE_UTF8:
 376           xxx_mbtowc = utf32be_mbtowc;
 377           goto loop_to_utf8;
 378         case (uintptr_t) _ICONV_UTF32LE_UTF8:
 379           xxx_mbtowc = utf32le_mbtowc;
 380           goto loop_to_utf8;
 381
 382        loop_to_utf8:
 383         if (inbuf == NULL || *inbuf == NULL)
 384           return 0;
 385         {
 386           ICONV_CONST char *inptr = *inbuf;
 387           size_t inleft = *inbytesleft;
 388           char *outptr = *outbuf;
 389           size_t outleft = *outbytesleft;
 390           size_t res = 0;
 391           while (inleft > 0)
 392             {
 393               ucs4_t uc;
 394               int m = xxx_mbtowc (&uc, (const uint8_t *) inptr, inleft);
 395               if (m <= 0)
 396                 {
 397                   if (m == RET_ILSEQ)
 398                     {
 399                       errno = EILSEQ;
 400                       res = (size_t)(-1);
 401                       break;
 402                     }
 403                   if (m == RET_TOOFEW)
 404                     {
 405                       errno = EINVAL;
 406                       res = (size_t)(-1);
 407                       break;
 408                     }
 409                   abort ();
 410                 }
 411               else
 412                 {
 413                   int n = u8_uctomb ((uint8_t *) outptr, uc, outleft);
 414                   if (n < 0)
 415                     {
 416                       if (n == -1)
 417                         {
 418                           errno = EILSEQ;
 419                           res = (size_t)(-1);
 420                           break;
 421                         }
 422                       if (n == -2)
 423                         {
 424                           errno = E2BIG;
 425                           res = (size_t)(-1);
 426                           break;
 427                         }
 428                       abort ();
 429                     }
 430                   else
 431                     {
 432                       inptr += m;
 433                       inleft -= m;
 434                       outptr += n;
 435                       outleft -= n;
 436                     }
 437                 }
 438             }
 439           *inbuf = inptr;
 440           *inbytesleft = inleft;
 441           *outbuf = outptr;
 442           *outbytesleft = outleft;
 443           return res;
 444         }
 445       }
 446     }
 447 #endif
 448   return iconv (cd, inbuf, inbytesleft, outbuf, outbytesleft);
 449 }