libiconv/iconv.c

   1 #include <iconv.h>
   2 #include <errno.h>
   3 #include <wchar.h>
   4 #include <string.h>
   5 #include <strings.h>
   6 #include <stdlib.h>
   7 #include <limits.h>
   8
   9 #include <dirent.h>
  10 #include <fcntl.h>
  11 #include <sys/mman.h>
  12 #include <sys/stat.h>
  13 #include <unistd.h>
  14 #include <stdint.h>
  15
  16 /* builtin charmaps */
  17 #include "charmaps.h"
  18
  19 /* only 0-7 are valid as dest charset */
  20 #define UTF_16BE    000
  21 #define UTF_16LE    001
  22 #define UTF_32BE    002
  23 #define UTF_32LE    003
  24 #define WCHAR_T     004
  25 #define UTF_8       005
  26 #define US_ASCII    006
  27 #define LATIN_1     007
  28
  29 /* additional charsets with algorithmic conversion */
  30 #define LATIN_9     010
  31 #define TIS_620     011
  32 #define JIS_0201    012
  33
  34 /* some programs like php need this */
  35 int _libiconv_version = _LIBICONV_VERSION;
  36
  37 /* these must match the constants above */
  38 static const unsigned char charsets[] =
  39         "\005" "UTF-8"      "\0"
  40         "\004" "WCHAR_T"    "\0"
  41         "\000" "UTF-16BE"   "\0"
  42         "\001" "UTF-16LE"   "\0"
  43         "\002" "UTF-32BE"   "\0"
  44         "\003" "UTF-32LE"   "\0"
  45         "\006" "ASCII"      "\0"
  46         "\006" "US-ASCII"   "\0"
  47         "\007" "ISO-8859-1" "\0"
  48         "\007" "LATIN1"     "\0"
  49         "\010" "ISO-8859-15""\0"
  50         "\010" "LATIN9"     "\0"
  51         "\011" "ISO-8859-11""\0"
  52         "\011" "TIS-620"    "\0"
  53         "\012" "JIS-0201"   "\0"
  54         "\377";
  55
  56 /* separate identifiers for sbcs/dbcs/etc map type */
  57 #define UCS2_8BIT   000
  58 #define UCS3_8BIT   001
  59 #define EUC         002
  60 #define EUC_TW      003
  61 #define SHIFT_JIS   004
  62 #define BIG5        005
  63 #define GBK         006
  64
  65 /* FIXME: these are not implemented yet
  66 // EUC:   A1-FE A1-FE
  67 // GBK:   81-FE 40-7E,80-FE
  68 // Big5:  A1-FE 40-7E,A1-FE
  69 */
  70
  71 static const unsigned short maplen[] = {
  72         [UCS2_8BIT] = 4+ 2* 128,
  73         [UCS3_8BIT] = 4+ 3* 128,
  74         [EUC]       = 4+ 2* 94*94,
  75         [SHIFT_JIS] = 4+ 2* 94*94,
  76         [BIG5]      = 4+ 2* 94*157,
  77         [GBK]       = 4+ 2* 126*190,
  78         [EUC_TW]    = 4+ 2* 2*94*94,
  79 };
  80
  81 static int find_charmap(const char *name)
  82 {
  83         int i;
  84         for (i = 0; i < (sizeof(charmaps) / sizeof(charmaps[0])); i++)
  85                 if (!strcasecmp(charmaps[i].name, name))
  86                         return i;
  87         return -1;
  88 }
  89
  90 static int find_charset(const char *name)
  91 {
  92         const unsigned char *s;
  93         for (s=charsets; *s<0xff && strcasecmp(s+1, name); s+=strlen(s)+1);
  94         return *s;
  95 }
  96
  97 iconv_t iconv_open(const char *to, const char *from)
  98 {
  99         unsigned f, t;
 100         int m;
 101
 102         if ((t = find_charset(to)) > 8)
 103                 return -1;
 104
 105         if ((f = find_charset(from)) < 255)
 106                 return 0 | (t<<1) | (f<<8);
 107
 108         if ((m = find_charmap(from)) > -1)
 109                 return 1 | (t<<1) | (m<<8);
 110
 111         return -1;
 112 }
 113
 114 int iconv_close(iconv_t cd)
 115 {
 116         return 0;
 117 }
 118
 119 static inline wchar_t get_16(const unsigned char *s, int endian)
 120 {
 121         endian &= 1;
 122         return s[endian]<<8 | s[endian^1];
 123 }
 124
 125 static inline void put_16(unsigned char *s, wchar_t c, int endian)
 126 {
 127         endian &= 1;
 128         s[endian] = c>>8;
 129         s[endian^1] = c;
 130 }
 131
 132 static inline int utf8enc_wchar(char *outb, wchar_t c)
 133 {
 134         if (c <= 0x7F) {
 135                 *outb = c;
 136                 return 1;
 137         }
 138         else if (c <= 0x7FF) {
 139                 *outb++ = ((c >>  6) & 0x1F) | 0xC0;
 140                 *outb++ = ( c        & 0x3F) | 0x80;
 141                 return 2;
 142         }
 143         else if (c <= 0xFFFF) {
 144                 *outb++ = ((c >> 12) & 0x0F) | 0xE0;
 145                 *outb++ = ((c >>  6) & 0x3F) | 0x80;
 146                 *outb++ = ( c        & 0x3F) | 0x80;
 147                 return 3;
 148         }
 149         else if (c <= 0x10FFFF) {
 150                 *outb++ = ((c >> 18) & 0x07) | 0xF0;
 151                 *outb++ = ((c >> 12) & 0x3F) | 0x80;
 152                 *outb++ = ((c >>  6) & 0x3F) | 0x80;
 153                 *outb++ = ( c        & 0x3F) | 0x80;
 154                 return 4;
 155         }
 156         else {
 157                 *outb++ = '?';
 158                 return 1;
 159         }
 160 }
 161
 162 static inline int utf8seq_is_overlong(char *s, int n)
 163 {
 164         switch (n)
 165         {
 166         case 2:
 167                 /* 1100000x (10xxxxxx) */
 168                 return (((*s >> 1) == 0x60) &&
 169                                 ((*(s+1) >> 6) == 0x02));
 170
 171         case 3:
 172                 /* 11100000 100xxxxx (10xxxxxx) */
 173                 return ((*s == 0xE0) &&
 174                                 ((*(s+1) >> 5) == 0x04) &&
 175                                 ((*(s+2) >> 6) == 0x02));
 176
 177         case 4:
 178                 /* 11110000 1000xxxx (10xxxxxx 10xxxxxx) */
 179                 return ((*s == 0xF0) &&
 180                                 ((*(s+1) >> 4) == 0x08) &&
 181                                 ((*(s+2) >> 6) == 0x02) &&
 182                                 ((*(s+3) >> 6) == 0x02));
 183         }
 184
 185         return 0;
 186 }
 187
 188 static inline int utf8seq_is_surrogate(char *s, int n)
 189 {
 190         return ((n == 3) && (*s == 0xED) && (*(s+1) >= 0xA0) && (*(s+1) <= 0xBF));
 191 }
 192
 193 static inline int utf8seq_is_illegal(char *s, int n)
 194 {
 195         return ((n == 3) && (*s == 0xEF) && (*(s+1) == 0xBF) &&
 196                 (*(s+2) >= 0xBE) && (*(s+2) <= 0xBF));
 197 }
 198
 199 static inline int utf8dec_wchar(wchar_t *c, unsigned char *in, size_t inb)
 200 {
 201         int i;
 202         int n = -1;
 203
 204         /* trivial char */
 205         if (*in <= 0x7F) {
 206                 *c = *in;
 207                 return 1;
 208         }
 209
 210         /* find utf8 sequence length */
 211         if      ((*in & 0xE0) == 0xC0) n = 2;
 212         else if ((*in & 0xF0) == 0xE0) n = 3;
 213         else if ((*in & 0xF8) == 0xF0) n = 4;
 214         else if ((*in & 0xFC) == 0xF8) n = 5;
 215         else if ((*in & 0xFE) == 0xFC) n = 6;
 216
 217         /* starved? */
 218         if (n > inb)
 219                 return -2;
 220
 221         /* decode ... */
 222         if (n > 1 && n < 5) {
 223                 /* reject invalid sequences */
 224                 if (utf8seq_is_overlong(in, n) ||
 225                         utf8seq_is_surrogate(in, n) ||
 226                         utf8seq_is_illegal(in, n))
 227                         return -1;
 228
 229                 /* decode ... */
 230                 *c = (char)(*in++ & (0x7F >> n));
 231
 232                 for (i = 1; i < n; i++) {
 233                         /* illegal continuation byte */
 234                         if (*in < 0x80 || *in > 0xBF)
 235                                 return -1;
 236
 237                         *c = (*c << 6) | (*in++ & 0x3F);
 238                 }
 239
 240                 return n;
 241         }
 242
 243         /* unmapped sequence (> 4) */
 244         return -1;
 245 }
 246
 247 static inline char latin9_translit(wchar_t c)
 248 {
 249         /* a number of trivial iso-8859-15 <> utf-8 transliterations */
 250         switch (c) {
 251         case 0x20AC: return 0xA4; /* Euro */
 252         case 0x0160: return 0xA6; /* S caron */
 253         case 0x0161: return 0xA8; /* s caron */
 254         case 0x017D: return 0xB4; /* Z caron */
 255         case 0x017E: return 0xB8; /* z caron */
 256         case 0x0152: return 0xBC; /* OE */
 257         case 0x0153: return 0xBD; /* oe */
 258         case 0x0178: return 0xBE; /* Y diaeresis */
 259         default:     return '?';
 260         }
 261 }
 262
 263 size_t iconv(iconv_t cd, char **in, size_t *inb, char **out, size_t *outb)
 264 {
 265         size_t x=0;
 266         unsigned char to = (cd>>1)&127;
 267         unsigned char from = 255;
 268         const unsigned char *map = 0;
 269         char tmp[MB_LEN_MAX];
 270         wchar_t c, d;
 271         size_t k, l;
 272         int err;
 273
 274         if (!in || !*in || !*inb) return 0;
 275
 276         if (cd & 1)
 277                 map = charmaps[cd>>8].map;
 278         else
 279                 from = cd>>8;
 280
 281         for (; *inb; *in+=l, *inb-=l) {
 282                 c = *(unsigned char *)*in;
 283                 l = 1;
 284                 if (from >= UTF_8 && c < 0x80) goto charok;
 285                 switch (from) {
 286                 case WCHAR_T:
 287                         l = sizeof(wchar_t);
 288                         if (*inb < l) goto starved;
 289                         c = *(wchar_t *)*in;
 290                         break;
 291                 case UTF_8:
 292                         l = utf8dec_wchar(&c, *in, *inb);
 293                         if (!l) l++;
 294                         else if (l == (size_t)-1) goto ilseq;
 295                         else if (l == (size_t)-2) goto starved;
 296                         break;
 297                 case US_ASCII:
 298                         goto ilseq;
 299                 case LATIN_9:
 300                         if ((unsigned)c - 0xa4 <= 0xbe - 0xa4) {
 301                                 static const unsigned char map[] = {
 302                                         0, 0x60, 0, 0x61, 0, 0, 0, 0, 0, 0, 0,
 303                                         0, 0, 0, 0, 0x7d, 0, 0, 0, 0x7e, 0, 0, 0,
 304                                         0x52, 0x53, 0x78
 305                                 };
 306                                 if (c == 0xa4) c = 0x20ac;
 307                                 else if (map[c-0xa5]) c = 0x100 | map[c-0xa5];
 308                         }
 309                 case LATIN_1:
 310                         goto charok;
 311                 case TIS_620:
 312                         if (c >= 0xa1) c += 0x0e01-0xa1;
 313                         goto charok;
 314                 case JIS_0201:
 315                         if (c >= 0xa1) {
 316                                 if (c <= 0xdf) c += 0xff61-0xa1;
 317                                 else goto ilseq;
 318                         }
 319                         goto charok;
 320                 case UTF_16BE:
 321                 case UTF_16LE:
 322                         l = 2;
 323                         if (*inb < 2) goto starved;
 324                         c = get_16(*in, from);
 325                         if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
 326                         if ((unsigned)(c-0xd800) < 0x400) {
 327                                 l = 4;
 328                                 if (*inb < 4) goto starved;
 329                                 d = get_16(*in + 2, from);
 330                                 if ((unsigned)(c-0xdc00) >= 0x400) goto ilseq;
 331                                 c = ((c-0xd800)<<10) | (d-0xdc00);
 332                         }
 333                         break;
 334                 case UTF_32BE:
 335                 case UTF_32LE:
 336                         l = 4;
 337                         if (*inb < 4) goto starved;
 338                         // FIXME
 339                         // c = get_32(*in, from);
 340                         break;
 341                 default:
 342                         /* only support ascii supersets */
 343                         if (c < 0x80) break;
 344                         switch (map[0]) {
 345                         case UCS2_8BIT:
 346                                 c -= 0x80;
 347                                 break;
 348                         case EUC:
 349                                 if ((unsigned)c - 0xa1 >= 94) goto ilseq;
 350                                 if ((unsigned)in[0][1] - 0xa1 >= 94) goto ilseq;
 351                                 c = (c-0xa1)*94 + (in[0][1]-0xa1);
 352                                 l = 2;
 353                                 break;
 354                         case SHIFT_JIS:
 355                                 if ((unsigned)c - 0xa1 <= 0xdf-0xa1) {
 356                                         c += 0xff61-0xa1;
 357                                         goto charok;
 358                                 }
 359                                 // FIXME...
 360                                 l = 2;
 361                                 break;
 362                         default:
 363                                 goto badf;
 364                         }
 365                         c = get_16(map + 4 + 2*c, 0);
 366                         if (c == 0xffff) goto ilseq;
 367                         goto charok;
 368                 }
 369
 370                 if ((unsigned)c - 0xd800 < 0x800 || (unsigned)c >= 0x110000)
 371                         goto ilseq;
 372 charok:
 373                 switch (to) {
 374                 case WCHAR_T:
 375                         if (*outb < sizeof(wchar_t)) goto toobig;
 376                         *(wchar_t *)*out = c;
 377                         *out += sizeof(wchar_t);
 378                         *outb -= sizeof(wchar_t);
 379                         break;
 380                 case UTF_8:
 381                         if (*outb < 4) {
 382                                 k = utf8enc_wchar(tmp, c);
 383                                 if (*outb < k) goto toobig;
 384                                 memcpy(*out, tmp, k);
 385                         } else k = utf8enc_wchar(*out, c);
 386                         *out += k;
 387                         *outb -= k;
 388                         break;
 389                 case US_ASCII:
 390                         if (c > 0x7f) c = 0xfffd;
 391                         /* fall thru and count replacement in latin1 case */
 392                 case LATIN_9:
 393                         if (c >= 0x100 && c != 0xfffd)
 394                                 c = latin9_translit(c);
 395                         /* fall through */
 396                 case LATIN_1:
 397                         if (!*outb) goto toobig;
 398                         if (c < 0x100) **out = c;
 399                         else x++, **out = '*'; //FIXME: translit?
 400                         ++*out;
 401                         --*outb;
 402                         break;
 403                 case UTF_16BE:
 404                 case UTF_16LE:
 405                         if (c < 0x10000) {
 406                                 if (*outb < 2) goto toobig;
 407                                 put_16(*out, c, to);
 408                                 *out += 2;
 409                                 *outb -= 2;
 410                                 break;
 411                         }
 412                         if (*outb < 4) goto toobig;
 413                         put_16(*out, (c>>10)|0xd800, to);
 414                         put_16(*out + 2, (c&0x3ff)|0xdc00, to);
 415                         *out += 4;
 416                         *outb -= 4;
 417                         break;
 418                 default:
 419                         goto badf;
 420                 }
 421         }
 422         return x;
 423 ilseq:
 424         err = EILSEQ;
 425         x = -1;
 426         goto end;
 427 badf:
 428         err = EBADF;
 429         x = -1;
 430         goto end;
 431 toobig:
 432         err = E2BIG;
 433         x = -1;
 434         goto end;
 435 starved:
 436         err = EINVAL;
 437 end:
 438         errno = err;
 439         return x;
 440 }