package/libs/libiconv/src/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         "\006" "ISO646-US"  "\0"
  48         "\006" "ISO_646.IRV:1991"  "\0"
  49         "\006" "ISO-IR-6"   "\0"
  50         "\006" "ANSI_X3.4-1968"    "\0"
  51         "\006" "ANSI_X3.4-1986"    "\0"
  52         "\006" "CP367"      "\0"
  53         "\006" "IBM367"     "\0"
  54         "\006" "US"         "\0"
  55         "\006" "CSASCII"    "\0"
  56         "\007" "ISO-8859-1" "\0"
  57         "\007" "LATIN1"     "\0"
  58         "\010" "ISO-8859-15""\0"
  59         "\010" "LATIN9"     "\0"
  60         "\011" "ISO-8859-11""\0"
  61         "\011" "TIS-620"    "\0"
  62         "\012" "JIS-0201"   "\0"
  63         "\377";
  64
  65 /* separate identifiers for sbcs/dbcs/etc map type */
  66 #define UCS2_8BIT   000
  67 #define UCS3_8BIT   001
  68 #define EUC         002
  69 #define EUC_TW      003
  70 #define SHIFT_JIS   004
  71 #define BIG5        005
  72 #define GBK         006
  73
  74 /* FIXME: these are not implemented yet
  75 // EUC:   A1-FE A1-FE
  76 // GBK:   81-FE 40-7E,80-FE
  77 // Big5:  A1-FE 40-7E,A1-FE
  78 */
  79
  80 static const unsigned short maplen[] = {
  81         [UCS2_8BIT] = 4+ 2* 128,
  82         [UCS3_8BIT] = 4+ 3* 128,
  83         [EUC]       = 4+ 2* 94*94,
  84         [SHIFT_JIS] = 4+ 2* 94*94,
  85         [BIG5]      = 4+ 2* 94*157,
  86         [GBK]       = 4+ 2* 126*190,
  87         [EUC_TW]    = 4+ 2* 2*94*94,
  88 };
  89
  90 static int find_charmap(const char *name)
  91 {
  92         int i;
  93         for (i = 0; i < (sizeof(charmaps) / sizeof(charmaps[0])); i++)
  94                 if (!strcasecmp(charmaps[i].name, name))
  95                         return i;
  96         return -1;
  97 }
  98
  99 static int find_charset(const char *name)
 100 {
 101         const unsigned char *s;
 102         for (s=charsets; *s<0xff && strcasecmp(s+1, name); s+=strlen(s)+1);
 103         return *s;
 104 }
 105
 106 iconv_t iconv_open(const char *to, const char *from)
 107 {
 108         unsigned f, t;
 109         int m;
 110
 111         if ((t = find_charset(to)) > 8)
 112                 return -1;
 113
 114         if ((f = find_charset(from)) < 255)
 115                 return 0 | (t<<1) | (f<<8);
 116
 117         if ((m = find_charmap(from)) > -1)
 118                 return 1 | (t<<1) | (m<<8);
 119
 120         return -1;
 121 }
 122
 123 int iconv_close(iconv_t cd)
 124 {
 125         return 0;
 126 }
 127
 128 static inline wchar_t get_16(const unsigned char *s, int endian)
 129 {
 130         endian &= 1;
 131         return s[endian]<<8 | s[endian^1];
 132 }
 133
 134 static inline void put_16(unsigned char *s, wchar_t c, int endian)
 135 {
 136         endian &= 1;
 137         s[endian] = c>>8;
 138         s[endian^1] = c;
 139 }
 140
 141 static inline int utf8enc_wchar(char *outb, wchar_t c)
 142 {
 143         if (c <= 0x7F) {
 144                 *outb = c;
 145                 return 1;
 146         }
 147         else if (c <= 0x7FF) {
 148                 *outb++ = ((c >>  6) & 0x1F) | 0xC0;
 149                 *outb++ = ( c        & 0x3F) | 0x80;
 150                 return 2;
 151         }
 152         else if (c <= 0xFFFF) {
 153                 *outb++ = ((c >> 12) & 0x0F) | 0xE0;
 154                 *outb++ = ((c >>  6) & 0x3F) | 0x80;
 155                 *outb++ = ( c        & 0x3F) | 0x80;
 156                 return 3;
 157         }
 158         else if (c <= 0x10FFFF) {
 159                 *outb++ = ((c >> 18) & 0x07) | 0xF0;
 160                 *outb++ = ((c >> 12) & 0x3F) | 0x80;
 161                 *outb++ = ((c >>  6) & 0x3F) | 0x80;
 162                 *outb++ = ( c        & 0x3F) | 0x80;
 163                 return 4;
 164         }
 165         else {
 166                 *outb++ = '?';
 167                 return 1;
 168         }
 169 }
 170
 171 static inline int utf8seq_is_overlong(char *s, int n)
 172 {
 173         switch (n)
 174         {
 175         case 2:
 176                 /* 1100000x (10xxxxxx) */
 177                 return (((*s >> 1) == 0x60) &&
 178                                 ((*(s+1) >> 6) == 0x02));
 179
 180         case 3:
 181                 /* 11100000 100xxxxx (10xxxxxx) */
 182                 return ((*s == 0xE0) &&
 183                                 ((*(s+1) >> 5) == 0x04) &&
 184                                 ((*(s+2) >> 6) == 0x02));
 185
 186         case 4:
 187                 /* 11110000 1000xxxx (10xxxxxx 10xxxxxx) */
 188                 return ((*s == 0xF0) &&
 189                                 ((*(s+1) >> 4) == 0x08) &&
 190                                 ((*(s+2) >> 6) == 0x02) &&
 191                                 ((*(s+3) >> 6) == 0x02));
 192         }
 193
 194         return 0;
 195 }
 196
 197 static inline int utf8seq_is_surrogate(char *s, int n)
 198 {
 199         return ((n == 3) && (*s == 0xED) && (*(s+1) >= 0xA0) && (*(s+1) <= 0xBF));
 200 }
 201
 202 static inline int utf8seq_is_illegal(char *s, int n)
 203 {
 204         return ((n == 3) && (*s == 0xEF) && (*(s+1) == 0xBF) &&
 205                 (*(s+2) >= 0xBE) && (*(s+2) <= 0xBF));
 206 }
 207
 208 static inline int utf8dec_wchar(wchar_t *c, unsigned char *in, size_t inb)
 209 {
 210         int i;
 211         int n = -1;
 212
 213         /* trivial char */
 214         if (*in <= 0x7F) {
 215                 *c = *in;
 216                 return 1;
 217         }
 218
 219         /* find utf8 sequence length */
 220         if      ((*in & 0xE0) == 0xC0) n = 2;
 221         else if ((*in & 0xF0) == 0xE0) n = 3;
 222         else if ((*in & 0xF8) == 0xF0) n = 4;
 223         else if ((*in & 0xFC) == 0xF8) n = 5;
 224         else if ((*in & 0xFE) == 0xFC) n = 6;
 225
 226         /* starved? */
 227         if (n > inb)
 228                 return -2;
 229
 230         /* decode ... */
 231         if (n > 1 && n < 5) {
 232                 /* reject invalid sequences */
 233                 if (utf8seq_is_overlong(in, n) ||
 234                         utf8seq_is_surrogate(in, n) ||
 235                         utf8seq_is_illegal(in, n))
 236                         return -1;
 237
 238                 /* decode ... */
 239                 *c = (char)(*in++ & (0x7F >> n));
 240
 241                 for (i = 1; i < n; i++) {
 242                         /* illegal continuation byte */
 243                         if (*in < 0x80 || *in > 0xBF)
 244                                 return -1;
 245
 246                         *c = (*c << 6) | (*in++ & 0x3F);
 247                 }
 248
 249                 return n;
 250         }
 251
 252         /* unmapped sequence (> 4) */
 253         return -1;
 254 }
 255
 256 static inline wchar_t latin9_translit(wchar_t c)
 257 {
 258         /* a number of trivial iso-8859-15 <> utf-8 transliterations */
 259         switch (c) {
 260         case 0x20AC: return 0xA4; /* Euro */
 261         case 0x0160: return 0xA6; /* S caron */
 262         case 0x0161: return 0xA8; /* s caron */
 263         case 0x017D: return 0xB4; /* Z caron */
 264         case 0x017E: return 0xB8; /* z caron */
 265         case 0x0152: return 0xBC; /* OE */
 266         case 0x0153: return 0xBD; /* oe */
 267         case 0x0178: return 0xBE; /* Y diaeresis */
 268         default:     return 0xFFFD; /* cannot translate */
 269         }
 270 }
 271
 272 size_t iconv(iconv_t cd, char **in, size_t *inb, char **out, size_t *outb)
 273 {
 274         size_t x=0;
 275         unsigned char to = (cd>>1)&127;
 276         unsigned char from = 255;
 277         const unsigned char *map = 0;
 278         char tmp[MB_LEN_MAX];
 279         wchar_t c, d;
 280         size_t k, l;
 281         int err;
 282
 283         if (!in || !*in || !*inb) return 0;
 284
 285         if (cd & 1)
 286                 map = charmaps[cd>>8].map;
 287         else
 288                 from = cd>>8;
 289
 290         for (; *inb; *in+=l, *inb-=l) {
 291                 c = *(unsigned char *)*in;
 292                 l = 1;
 293                 if (from >= UTF_8 && c < 0x80) goto charok;
 294                 switch (from) {
 295                 case WCHAR_T:
 296                         l = sizeof(wchar_t);
 297                         if (*inb < l) goto starved;
 298                         c = *(wchar_t *)*in;
 299                         break;
 300                 case UTF_8:
 301                         l = utf8dec_wchar(&c, *in, *inb);
 302                         if (!l) l++;
 303                         else if (l == (size_t)-1) goto ilseq;
 304                         else if (l == (size_t)-2) goto starved;
 305                         break;
 306                 case US_ASCII:
 307                         goto ilseq;
 308                 case LATIN_9:
 309                         if ((unsigned)c - 0xa4 <= 0xbe - 0xa4) {
 310                                 static const unsigned char map[] = {
 311                                         0, 0x60, 0, 0x61, 0, 0, 0, 0, 0, 0, 0,
 312                                         0, 0, 0, 0, 0x7d, 0, 0, 0, 0x7e, 0, 0, 0,
 313                                         0x52, 0x53, 0x78
 314                                 };
 315                                 if (c == 0xa4) c = 0x20ac;
 316                                 else if (map[c-0xa5]) c = 0x100 | map[c-0xa5];
 317                         }
 318                 case LATIN_1:
 319                         goto charok;
 320                 case TIS_620:
 321                         if (c >= 0xa1) c += 0x0e01-0xa1;
 322                         goto charok;
 323                 case JIS_0201:
 324                         if (c >= 0xa1) {
 325                                 if (c <= 0xdf) c += 0xff61-0xa1;
 326                                 else goto ilseq;
 327                         }
 328                         goto charok;
 329                 case UTF_16BE:
 330                 case UTF_16LE:
 331                         l = 2;
 332                         if (*inb < 2) goto starved;
 333                         c = get_16(*in, from);
 334                         if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
 335                         if ((unsigned)(c-0xd800) < 0x400) {
 336                                 l = 4;
 337                                 if (*inb < 4) goto starved;
 338                                 d = get_16(*in + 2, from);
 339                                 if ((unsigned)(c-0xdc00) >= 0x400) goto ilseq;
 340                                 c = ((c-0xd800)<<10) | (d-0xdc00);
 341                         }
 342                         break;
 343                 case UTF_32BE:
 344                 case UTF_32LE:
 345                         l = 4;
 346                         if (*inb < 4) goto starved;
 347                         // FIXME
 348                         // c = get_32(*in, from);
 349                         break;
 350                 default:
 351                         /* only support ascii supersets */
 352                         if (c < 0x80) break;
 353                         switch (map[0]) {
 354                         case UCS2_8BIT:
 355                                 c -= 0x80;
 356                                 break;
 357                         case EUC:
 358                                 if ((unsigned)c - 0xa1 >= 94) goto ilseq;
 359                                 if ((unsigned)in[0][1] - 0xa1 >= 94) goto ilseq;
 360                                 c = (c-0xa1)*94 + (in[0][1]-0xa1);
 361                                 l = 2;
 362                                 break;
 363                         case SHIFT_JIS:
 364                                 if ((unsigned)c - 0xa1 <= 0xdf-0xa1) {
 365                                         c += 0xff61-0xa1;
 366                                         goto charok;
 367                                 }
 368                                 // FIXME...
 369                                 l = 2;
 370                                 break;
 371                         default:
 372                                 goto badf;
 373                         }
 374                         c = get_16(map + 4 + 2*c, 0);
 375                         if (c == 0xffff) goto ilseq;
 376                         goto charok;
 377                 }
 378
 379                 if ((unsigned)c - 0xd800 < 0x800 || (unsigned)c >= 0x110000)
 380                         goto ilseq;
 381 charok:
 382                 switch (to) {
 383                 case WCHAR_T:
 384                         if (*outb < sizeof(wchar_t)) goto toobig;
 385                         *(wchar_t *)*out = c;
 386                         *out += sizeof(wchar_t);
 387                         *outb -= sizeof(wchar_t);
 388                         break;
 389                 case UTF_8:
 390                         if (*outb < 4) {
 391                                 k = utf8enc_wchar(tmp, c);
 392                                 if (*outb < k) goto toobig;
 393                                 memcpy(*out, tmp, k);
 394                         } else k = utf8enc_wchar(*out, c);
 395                         *out += k;
 396                         *outb -= k;
 397                         break;
 398                 case US_ASCII:
 399                         if (c > 0x7f) c = 0xfffd;
 400                         /* fall thru and count replacement in latin1 case */
 401                 case LATIN_9:
 402                         if (c >= 0x100 && c != 0xfffd)
 403                                 c = latin9_translit(c);
 404                         /* fall through */
 405                 case LATIN_1:
 406                         if (c > 0xff) goto ilseq;
 407                         if (!*outb) goto toobig;
 408                         **out = c;
 409                         ++*out;
 410                         --*outb;
 411                         break;
 412                 case UTF_16BE:
 413                 case UTF_16LE:
 414                         if (c < 0x10000) {
 415                                 if (*outb < 2) goto toobig;
 416                                 put_16(*out, c, to);
 417                                 *out += 2;
 418                                 *outb -= 2;
 419                                 break;
 420                         }
 421                         if (*outb < 4) goto toobig;
 422                         put_16(*out, (c>>10)|0xd800, to);
 423                         put_16(*out + 2, (c&0x3ff)|0xdc00, to);
 424                         *out += 4;
 425                         *outb -= 4;
 426                         break;
 427                 default:
 428                         goto badf;
 429                 }
 430         }
 431         return x;
 432 ilseq:
 433         err = EILSEQ;
 434         x = -1;
 435         goto end;
 436 badf:
 437         err = EBADF;
 438         x = -1;
 439         goto end;
 440 toobig:
 441         err = E2BIG;
 442         x = -1;
 443         goto end;
 444 starved:
 445         err = EINVAL;
 446 end:
 447         errno = err;
 448         return x;
 449 }