nsz Git - musl/blob - src/locale/iconv.c

   1 #include <iconv.h>
   2 #include <errno.h>
   3 #include <wchar.h>
   4 #include <string.h>
   5 #include <stdlib.h>
   6 #include <limits.h>
   7 #include <stdint.h>
   8 #include "locale_impl.h"
   9
  10 #define UTF_32BE    0300
  11 #define UTF_16LE    0301
  12 #define UTF_16BE    0302
  13 #define UTF_32LE    0303
  14 #define UCS2BE      0304
  15 #define UCS2LE      0305
  16 #define WCHAR_T     0306
  17 #define US_ASCII    0307
  18 #define UTF_8       0310
  19 #define EUC_JP      0320
  20 #define SHIFT_JIS   0321
  21 #define ISO2022_JP  0322
  22 #define GB18030     0330
  23 #define GBK         0331
  24 #define GB2312      0332
  25 #define BIG5        0340
  26 #define EUC_KR      0350
  27
  28 /* Definitions of charmaps. Each charmap consists of:
  29  * 1. Empty-string-terminated list of null-terminated aliases.
  30  * 2. Special type code or number of elided quads of entries.
  31  * 3. Character table (size determined by field 2), consisting
  32  *    of 5 bytes for every 4 characters, interpreted as 10-bit
  33  *    indices into the legacy_chars table. */
  34
  35 static const unsigned char charmaps[] =
  36 "utf8\0char\0\0\310"
  37 "wchart\0\0\306"
  38 "ucs2\0ucs2be\0\0\304"
  39 "ucs2le\0\0\305"
  40 "utf16\0utf16be\0\0\302"
  41 "utf16le\0\0\301"
  42 "ucs4\0ucs4be\0utf32\0utf32be\0\0\300"
  43 "ucs4le\0utf32le\0\0\303"
  44 "ascii\0usascii\0iso646\0iso646us\0\0\307"
  45 "eucjp\0\0\320"
  46 "shiftjis\0sjis\0\0\321"
  47 "iso2022jp\0\0\322"
  48 "gb18030\0\0\330"
  49 "gbk\0\0\331"
  50 "gb2312\0\0\332"
  51 "big5\0bigfive\0cp950\0big5hkscs\0\0\340"
  52 "euckr\0ksc5601\0ksx1001\0cp949\0\0\350"
  53 #include "codepages.h"
  54 ;
  55
  56 /* Table of characters that appear in legacy 8-bit codepages,
  57  * limited to 1024 slots (10 bit indices). The first 256 entries
  58  * are elided since those characters are obviously all included. */
  59 static const unsigned short legacy_chars[] = {
  60 #include "legacychars.h"
  61 };
  62
  63 static const unsigned short jis0208[84][94] = {
  64 #include "jis0208.h"
  65 };
  66
  67 static const unsigned short gb18030[126][190] = {
  68 #include "gb18030.h"
  69 };
  70
  71 static const unsigned short big5[89][157] = {
  72 #include "big5.h"
  73 };
  74
  75 static const unsigned short hkscs[] = {
  76 #include "hkscs.h"
  77 };
  78
  79 static const unsigned short ksc[93][94] = {
  80 #include "ksc.h"
  81 };
  82
  83 static int fuzzycmp(const unsigned char *a, const unsigned char *b)
  84 {
  85         for (; *a && *b; a++, b++) {
  86                 while (*a && (*a|32U)-'a'>26 && *a-'0'>10U) a++;
  87                 if ((*a|32U) != *b) return 1;
  88         }
  89         return *a != *b;
  90 }
  91
  92 static size_t find_charmap(const void *name)
  93 {
  94         const unsigned char *s;
  95         if (!*(char *)name) name=charmaps; /* "utf8" */
  96         for (s=charmaps; *s; ) {
  97                 if (!fuzzycmp(name, s)) {
  98                         for (; *s; s+=strlen((void *)s)+1);
  99                         return s+1-charmaps;
 100                 }
 101                 s += strlen((void *)s)+1;
 102                 if (!*s) {
 103                         if (s[1] > 0200) s+=2;
 104                         else s+=2+(64U-s[1])*5;
 105                 }
 106         }
 107         return -1;
 108 }
 109
 110 struct stateful_cd {
 111         iconv_t base_cd;
 112         unsigned state;
 113 };
 114
 115 static iconv_t combine_to_from(size_t t, size_t f)
 116 {
 117         return (void *)(f<<16 | t<<1 | 1);
 118 }
 119
 120 static size_t extract_from(iconv_t cd)
 121 {
 122         return (size_t)cd >> 16;
 123 }
 124
 125 static size_t extract_to(iconv_t cd)
 126 {
 127         return (size_t)cd >> 1 & 0x7fff;
 128 }
 129
 130 iconv_t iconv_open(const char *to, const char *from)
 131 {
 132         size_t f, t;
 133         struct stateful_cd *scd;
 134
 135         if ((t = find_charmap(to))==-1
 136          || (f = find_charmap(from))==-1
 137          || (charmaps[t] >= 0320)) {
 138                 errno = EINVAL;
 139                 return (iconv_t)-1;
 140         }
 141         iconv_t cd = combine_to_from(t, f);
 142
 143         switch (charmaps[f]) {
 144         case ISO2022_JP:
 145                 scd = malloc(sizeof *scd);
 146                 if (!scd) return (iconv_t)-1;
 147                 scd->base_cd = cd;
 148                 scd->state = 0;
 149                 cd = (iconv_t)scd;
 150         }
 151
 152         return cd;
 153 }
 154
 155 static unsigned get_16(const unsigned char *s, int e)
 156 {
 157         e &= 1;
 158         return s[e]<<8 | s[1-e];
 159 }
 160
 161 static void put_16(unsigned char *s, unsigned c, int e)
 162 {
 163         e &= 1;
 164         s[e] = c>>8;
 165         s[1-e] = c;
 166 }
 167
 168 static unsigned get_32(const unsigned char *s, int e)
 169 {
 170         e &= 3;
 171         return s[e]+0U<<24 | s[e^1]<<16 | s[e^2]<<8 | s[e^3];
 172 }
 173
 174 static void put_32(unsigned char *s, unsigned c, int e)
 175 {
 176         e &= 3;
 177         s[e^0] = c>>24;
 178         s[e^1] = c>>16;
 179         s[e^2] = c>>8;
 180         s[e^3] = c;
 181 }
 182
 183 /* Adapt as needed */
 184 #define mbrtowc_utf8 mbrtowc
 185 #define wctomb_utf8 wctomb
 186
 187 static unsigned legacy_map(const unsigned char *map, unsigned c)
 188 {
 189         if (c < 4*map[-1]) return c;
 190         unsigned x = c - 4*map[-1];
 191         x = map[x*5/4]>>2*x%8 | map[x*5/4+1]<<8-2*x%8 & 1023;
 192         return x < 256 ? x : legacy_chars[x-256];
 193 }
 194
 195 size_t iconv(iconv_t cd, char **restrict in, size_t *restrict inb, char **restrict out, size_t *restrict outb)
 196 {
 197         size_t x=0;
 198         struct stateful_cd *scd=0;
 199         if (!((size_t)cd & 1)) {
 200                 scd = (void *)cd;
 201                 cd = scd->base_cd;
 202         }
 203         unsigned to = extract_to(cd);
 204         unsigned from = extract_from(cd);
 205         const unsigned char *map = charmaps+from+1;
 206         const unsigned char *tomap = charmaps+to+1;
 207         mbstate_t st = {0};
 208         wchar_t wc;
 209         unsigned c, d;
 210         size_t k, l;
 211         int err;
 212         unsigned char type = map[-1];
 213         unsigned char totype = tomap[-1];
 214         locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
 215
 216         if (!in || !*in || !*inb) return 0;
 217
 218         *ploc = UTF8_LOCALE;
 219
 220         for (; *inb; *in+=l, *inb-=l) {
 221                 c = *(unsigned char *)*in;
 222                 l = 1;
 223
 224                 switch (type) {
 225                 case UTF_8:
 226                         if (c < 128) break;
 227                         l = mbrtowc_utf8(&wc, *in, *inb, &st);
 228                         if (l == (size_t)-1) goto ilseq;
 229                         if (l == (size_t)-2) goto starved;
 230                         c = wc;
 231                         break;
 232                 case US_ASCII:
 233                         if (c >= 128) goto ilseq;
 234                         break;
 235                 case WCHAR_T:
 236                         l = sizeof(wchar_t);
 237                         if (*inb < l) goto starved;
 238                         c = *(wchar_t *)*in;
 239                         if (0) {
 240                 case UTF_32BE:
 241                 case UTF_32LE:
 242                         l = 4;
 243                         if (*inb < 4) goto starved;
 244                         c = get_32((void *)*in, type);
 245                         }
 246                         if (c-0xd800u < 0x800u || c >= 0x110000u) goto ilseq;
 247                         break;
 248                 case UCS2BE:
 249                 case UCS2LE:
 250                 case UTF_16BE:
 251                 case UTF_16LE:
 252                         l = 2;
 253                         if (*inb < 2) goto starved;
 254                         c = get_16((void *)*in, type);
 255                         if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
 256                         if ((unsigned)(c-0xd800) < 0x400) {
 257                                 if (type-UCS2BE < 2U) goto ilseq;
 258                                 l = 4;
 259                                 if (*inb < 4) goto starved;
 260                                 d = get_16((void *)(*in + 2), type);
 261                                 if ((unsigned)(d-0xdc00) >= 0x400) goto ilseq;
 262                                 c = ((c-0xd7c0)<<10) + (d-0xdc00);
 263                         }
 264                         break;
 265                 case SHIFT_JIS:
 266                         if (c < 128) break;
 267                         if (c-0xa1 <= 0xdf-0xa1) {
 268                                 c += 0xff61-0xa1;
 269                                 break;
 270                         }
 271                         l = 2;
 272                         if (*inb < 2) goto starved;
 273                         d = *((unsigned char *)*in + 1);
 274                         if (c-129 <= 159-129) c -= 129;
 275                         else if (c-224 <= 239-224) c -= 193;
 276                         else goto ilseq;
 277                         c *= 2;
 278                         if (d-64 <= 158-64) {
 279                                 if (d==127) goto ilseq;
 280                                 if (d>127) d--;
 281                                 d -= 64;
 282                         } else if (d-159 <= 252-159) {
 283                                 c++;
 284                                 d -= 159;
 285                         }
 286                         c = jis0208[c][d];
 287                         if (!c) goto ilseq;
 288                         break;
 289                 case EUC_JP:
 290                         if (c < 128) break;
 291                         l = 2;
 292                         if (*inb < 2) goto starved;
 293                         d = *((unsigned char *)*in + 1);
 294                         if (c==0x8e) {
 295                                 c = d;
 296                                 if (c-0xa1 > 0xdf-0xa1) goto ilseq;
 297                                 c += 0xff61 - 0xa1;
 298                                 break;
 299                         }
 300                         c -= 0xa1;
 301                         d -= 0xa1;
 302                         if (c >= 84 || d >= 94) goto ilseq;
 303                         c = jis0208[c][d];
 304                         if (!c) goto ilseq;
 305                         break;
 306                 case ISO2022_JP:
 307                         if (c >= 128) goto ilseq;
 308                         if (c == '\033') {
 309                                 l = 3;
 310                                 if (*inb < 3) goto starved;
 311                                 c = *((unsigned char *)*in + 1);
 312                                 d = *((unsigned char *)*in + 2);
 313                                 if (c != '(' && c != '$') goto ilseq;
 314                                 switch (128*(c=='$') + d) {
 315                                 case 'B': scd->state=0; continue;
 316                                 case 'J': scd->state=1; continue;
 317                                 case 'I': scd->state=4; continue;
 318                                 case 128+'@': scd->state=2; continue;
 319                                 case 128+'B': scd->state=3; continue;
 320                                 }
 321                                 goto ilseq;
 322                         }
 323                         switch (scd->state) {
 324                         case 1:
 325                                 if (c=='\\') c = 0xa5;
 326                                 if (c=='~') c = 0x203e;
 327                                 break;
 328                         case 2:
 329                         case 3:
 330                                 l = 2;
 331                                 if (*inb < 2) goto starved;
 332                                 d = *((unsigned char *)*in + 1);
 333                                 c -= 0x21;
 334                                 d -= 0x21;
 335                                 if (c >= 84 || d >= 94) goto ilseq;
 336                                 c = jis0208[c][d];
 337                                 if (!c) goto ilseq;
 338                                 break;
 339                         case 4:
 340                                 if (c-0x60 < 0x1f) goto ilseq;
 341                                 if (c-0x21 < 0x5e) c += 0xff61-0x21;
 342                                 break;
 343                         }
 344                         break;
 345                 case GB2312:
 346                         if (c < 128) break;
 347                         if (c < 0xa1) goto ilseq;
 348                 case GBK:
 349                 case GB18030:
 350                         if (c < 128) break;
 351                         c -= 0x81;
 352                         if (c >= 126) goto ilseq;
 353                         l = 2;
 354                         if (*inb < 2) goto starved;
 355                         d = *((unsigned char *)*in + 1);
 356                         if (d < 0xa1 && type == GB2312) goto ilseq;
 357                         if (d-0x40>=191 || d==127) {
 358                                 if (d-'0'>9 || type != GB18030)
 359                                         goto ilseq;
 360                                 l = 4;
 361                                 if (*inb < 4) goto starved;
 362                                 c = (10*c + d-'0') * 1260;
 363                                 d = *((unsigned char *)*in + 2);
 364                                 if (d-0x81>126) goto ilseq;
 365                                 c += 10*(d-0x81);
 366                                 d = *((unsigned char *)*in + 3);
 367                                 if (d-'0'>9) goto ilseq;
 368                                 c += d-'0';
 369                                 c += 128;
 370                                 for (d=0; d<=c; ) {
 371                                         k = 0;
 372                                         for (int i=0; i<126; i++)
 373                                                 for (int j=0; j<190; j++)
 374                                                         if (gb18030[i][j]-d <= c-d)
 375                                                                 k++;
 376                                         d = c+1;
 377                                         c += k;
 378                                 }
 379                                 break;
 380                         }
 381                         d -= 0x40;
 382                         if (d>63) d--;
 383                         c = gb18030[c][d];
 384                         break;
 385                 case BIG5:
 386                         if (c < 128) break;
 387                         l = 2;
 388                         if (*inb < 2) goto starved;
 389                         d = *((unsigned char *)*in + 1);
 390                         if (d-0x40>=0xff-0x40 || d-0x7f<0xa1-0x7f) goto ilseq;
 391                         d -= 0x40;
 392                         if (d > 0x3e) d -= 0x22;
 393                         if (c-0xa1>=0xfa-0xa1) {
 394                                 if (c-0x87>=0xff-0x87) goto ilseq;
 395                                 if (c < 0xa1) c -= 0x87;
 396                                 else c -= 0x87 + (0xfa-0xa1);
 397                                 c = (hkscs[4867+(c*157+d)/16]>>(c*157+d)%16)%2<<17
 398                                         | hkscs[c*157+d];
 399                                 /* A few HKSCS characters map to pairs of UCS
 400                                  * characters. These are mapped to surrogate
 401                                  * range in the hkscs table then hard-coded
 402                                  * here. Ugly, yes. */
 403                                 if (c/256 == 0xdc) {
 404                                         if (totype-0300U > 8) k = 2;
 405                                         else k = "\10\4\4\10\4\4\10\2\4"[totype-0300];
 406                                         if (k > *outb) goto toobig;
 407                                         x += iconv(combine_to_from(to, 0),
 408                                                 &(char *){"\303\212\314\204"
 409                                                 "\303\212\314\214"
 410                                                 "\303\252\314\204"
 411                                                 "\303\252\314\214"
 412                                                 +c%256}, &(size_t){4},
 413                                                 out, outb);
 414                                         continue;
 415                                 }
 416                                 if (!c) goto ilseq;
 417                                 break;
 418                         }
 419                         c -= 0xa1;
 420                         c = big5[c][d]|(c==0x27&&(d==0x3a||d==0x3c||d==0x42))<<17;
 421                         if (!c) goto ilseq;
 422                         break;
 423                 case EUC_KR:
 424                         if (c < 128) break;
 425                         l = 2;
 426                         if (*inb < 2) goto starved;
 427                         d = *((unsigned char *)*in + 1);
 428                         c -= 0xa1;
 429                         d -= 0xa1;
 430                         if (c >= 93 || d >= 94) {
 431                                 c += (0xa1-0x81);
 432                                 d += 0xa1;
 433                                 if (c >= 93 || c>=0xc6-0x81 && d>0x52)
 434                                         goto ilseq;
 435                                 if (d-'A'<26) d = d-'A';
 436                                 else if (d-'a'<26) d = d-'a'+26;
 437                                 else if (d-0x81<0xff-0x81) d = d-0x81+52;
 438                                 else goto ilseq;
 439                                 if (c < 0x20) c = 178*c + d;
 440                                 else c = 178*0x20 + 84*(c-0x20) + d;
 441                                 c += 0xac00;
 442                                 for (d=0xac00; d<=c; ) {
 443                                         k = 0;
 444                                         for (int i=0; i<93; i++)
 445                                                 for (int j=0; j<94; j++)
 446                                                         if (ksc[i][j]-d <= c-d)
 447                                                                 k++;
 448                                         d = c+1;
 449                                         c += k;
 450                                 }
 451                                 break;
 452                         }
 453                         c = ksc[c][d];
 454                         if (!c) goto ilseq;
 455                         break;
 456                 default:
 457                         if (!c) break;
 458                         c = legacy_map(map, c);
 459                         if (!c) goto ilseq;
 460                 }
 461
 462                 switch (totype) {
 463                 case WCHAR_T:
 464                         if (*outb < sizeof(wchar_t)) goto toobig;
 465                         *(wchar_t *)*out = c;
 466                         *out += sizeof(wchar_t);
 467                         *outb -= sizeof(wchar_t);
 468                         break;
 469                 case UTF_8:
 470                         if (*outb < 4) {
 471                                 char tmp[4];
 472                                 k = wctomb_utf8(tmp, c);
 473                                 if (*outb < k) goto toobig;
 474                                 memcpy(*out, tmp, k);
 475                         } else k = wctomb_utf8(*out, c);
 476                         *out += k;
 477                         *outb -= k;
 478                         break;
 479                 case US_ASCII:
 480                         if (c > 0x7f) subst: x++, c='*';
 481                 default:
 482                         if (*outb < 1) goto toobig;
 483                         if (c<256 && c==legacy_map(tomap, c)) {
 484                         revout:
 485                                 *(*out)++ = c;
 486                                 *outb -= 1;
 487                                 break;
 488                         }
 489                         d = c;
 490                         for (c=4*totype; c<256; c++) {
 491                                 if (d == legacy_map(tomap, c)) {
 492                                         goto revout;
 493                                 }
 494                         }
 495                         goto subst;
 496                 case UCS2BE:
 497                 case UCS2LE:
 498                 case UTF_16BE:
 499                 case UTF_16LE:
 500                         if (c < 0x10000 || type-UCS2BE < 2U) {
 501                                 if (c >= 0x10000) c = 0xFFFD;
 502                                 if (*outb < 2) goto toobig;
 503                                 put_16((void *)*out, c, totype);
 504                                 *out += 2;
 505                                 *outb -= 2;
 506                                 break;
 507                         }
 508                         if (*outb < 4) goto toobig;
 509                         c -= 0x10000;
 510                         put_16((void *)*out, (c>>10)|0xd800, totype);
 511                         put_16((void *)(*out + 2), (c&0x3ff)|0xdc00, totype);
 512                         *out += 4;
 513                         *outb -= 4;
 514                         break;
 515                 case UTF_32BE:
 516                 case UTF_32LE:
 517                         if (*outb < 4) goto toobig;
 518                         put_32((void *)*out, c, totype);
 519                         *out += 4;
 520                         *outb -= 4;
 521                         break;
 522                 }
 523         }
 524         *ploc = loc;
 525         return x;
 526 ilseq:
 527         err = EILSEQ;
 528         x = -1;
 529         goto end;
 530 toobig:
 531         err = E2BIG;
 532         x = -1;
 533         goto end;
 534 starved:
 535         err = EINVAL;
 536         x = -1;
 537 end:
 538         errno = err;
 539         *ploc = loc;
 540         return x;
 541 }