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