lib/libkiconv/xlat16_iconv.c

   1 /*-
   2  * Copyright (c) 2003, 2005 Ryuichiro Imura
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 /*
  30  * kiconv(3) requires shared linked, and reduce module size
  31  * when statically linked.
  32  */
  33
  34 #ifdef PIC
  35
  36 #include <sys/types.h>
  37 #include <sys/iconv.h>
  38 #include <sys/sysctl.h>
  39
  40 #include <ctype.h>
  41 #include <dlfcn.h>
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <locale.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <wctype.h>
  49
  50 #include "quirks.h"
  51
  52 typedef void *iconv_t;
  53
  54 struct xlat16_table {
  55         uint32_t *      idx[0x200];
  56         void *          data;
  57         size_t          size;
  58 };
  59
  60 static struct xlat16_table kiconv_xlat16_open(const char *, const char *, int);
  61 static int chklocale(int, const char *);
  62
  63 #ifdef ICONV_DLOPEN
  64 static int my_iconv_init(void);
  65 static iconv_t (*my_iconv_open)(const char *, const char *);
  66 static size_t (*my_iconv)(iconv_t, const char **, size_t *, char **, size_t *);
  67 static int (*my_iconv_close)(iconv_t);
  68 #else
  69 #include <iconv.h>
  70 #define my_iconv_init() 0
  71 #define my_iconv_open iconv_open
  72 #define my_iconv iconv
  73 #define my_iconv_close iconv_close
  74 #endif
  75 static size_t my_iconv_char(iconv_t, const u_char **, size_t *, u_char **, size_t *);
  76
  77 int
  78 kiconv_add_xlat16_cspair(const char *tocode, const char *fromcode, int flag)
  79 {
  80         int error;
  81         size_t idxsize;
  82         struct xlat16_table xt;
  83         void *data;
  84         char *p;
  85         const char unicode[] = ENCODING_UNICODE;
  86
  87         if ((flag & KICONV_WCTYPE) == 0 &&
  88             strcmp(unicode, tocode) != 0 &&
  89             strcmp(unicode, fromcode) != 0 &&
  90             kiconv_lookupconv(unicode) == 0) {
  91                 error = kiconv_add_xlat16_cspair(unicode, fromcode, flag);
  92                 if (error)
  93                         return (-1);
  94                 error = kiconv_add_xlat16_cspair(tocode, unicode, flag);
  95                 return (error);
  96         }
  97
  98         if (kiconv_lookupcs(tocode, fromcode) == 0)
  99                 return (0);
 100
 101         if (flag & KICONV_WCTYPE)
 102                 xt = kiconv_xlat16_open(fromcode, fromcode, flag);
 103         else
 104                 xt = kiconv_xlat16_open(tocode, fromcode, flag);
 105         if (xt.size == 0)
 106                 return (-1);
 107
 108         idxsize = sizeof(xt.idx);
 109
 110         if ((idxsize + xt.size) > ICONV_CSMAXDATALEN) {
 111                 errno = E2BIG;
 112                 return (-1);
 113         }
 114
 115         if ((data = malloc(idxsize + xt.size)) != NULL) {
 116                 p = data;
 117                 memcpy(p, xt.idx, idxsize);
 118                 p += idxsize;
 119                 memcpy(p, xt.data, xt.size);
 120                 error = kiconv_add_xlat16_table(tocode, fromcode, data,
 121                     (int)(idxsize + xt.size));
 122                 return (error);
 123         }
 124
 125         return (-1);
 126 }
 127
 128 int
 129 kiconv_add_xlat16_cspairs(const char *foreigncode, const char *localcode)
 130 {
 131         int error, locale;
 132
 133         error = kiconv_add_xlat16_cspair(foreigncode, localcode,
 134             KICONV_FROM_LOWER | KICONV_FROM_UPPER);
 135         if (error)
 136                 return (error);
 137         error = kiconv_add_xlat16_cspair(localcode, foreigncode,
 138             KICONV_LOWER | KICONV_UPPER);
 139         if (error)
 140                 return (error);
 141         locale = chklocale(LC_CTYPE, localcode);
 142         if (locale == 0) {
 143                 error = kiconv_add_xlat16_cspair(KICONV_WCTYPE_NAME, localcode,
 144                     KICONV_WCTYPE);
 145                 if (error)
 146                         return (error);
 147         }
 148
 149         return (0);
 150 }
 151
 152 static struct xlat16_table
 153 kiconv_xlat16_open(const char *tocode, const char *fromcode, int lcase)
 154 {
 155         u_char src[3], dst[4], *srcp, *dstp, ud, ld;
 156         int us, ls, ret;
 157         uint16_t c;
 158         uint32_t table[0x80];
 159         size_t inbytesleft, outbytesleft, pre_q_size, post_q_size;
 160         struct xlat16_table xt;
 161         struct quirk_replace_list *pre_q_list, *post_q_list;
 162         iconv_t cd;
 163         char *p;
 164
 165         xt.data = NULL;
 166         xt.size = 0;
 167
 168         src[2] = '\0';
 169         dst[3] = '\0';
 170
 171         ret = my_iconv_init();
 172         if (ret)
 173                 return (xt);
 174
 175         cd = my_iconv_open(search_quirk(tocode, fromcode, &pre_q_list, &pre_q_size),
 176             search_quirk(fromcode, tocode, &post_q_list, &post_q_size));
 177         if (cd == (iconv_t) (-1))
 178                 return (xt);
 179
 180         if ((xt.data = malloc(0x200 * 0x80 * sizeof(uint32_t))) == NULL)
 181                 return (xt);
 182
 183         p = xt.data;
 184
 185         for (ls = 0 ; ls < 0x200 ; ls++) {
 186                 xt.idx[ls] = NULL;
 187                 for (us = 0 ; us < 0x80 ; us++) {
 188                         srcp = src;
 189                         dstp = dst;
 190
 191                         inbytesleft = 2;
 192                         outbytesleft = 3;
 193                         bzero(dst, outbytesleft);
 194
 195                         c = ((ls & 0x100 ? us | 0x80 : us) << 8) | (u_char)ls;
 196
 197                         if (lcase & KICONV_WCTYPE) {
 198                                 if ((c & 0xff) == 0)
 199                                         c >>= 8;
 200                                 if (iswupper(c)) {
 201                                         c = towlower(c);
 202                                         if ((c & 0xff00) == 0)
 203                                                 c <<= 8;
 204                                         table[us] = c | XLAT16_HAS_LOWER_CASE;
 205                                 } else if (iswlower(c)) {
 206                                         c = towupper(c);
 207                                         if ((c & 0xff00) == 0)
 208                                                 c <<= 8;
 209                                         table[us] = c | XLAT16_HAS_UPPER_CASE;
 210                                 } else
 211                                         table[us] = 0;
 212                                 /*
 213                                  * store not NULL
 214                                  */
 215                                 if (table[us])
 216                                         xt.idx[ls] = table;
 217
 218                                 continue;
 219                         }
 220
 221                         c = quirk_vendor2unix(c, pre_q_list, pre_q_size);
 222                         src[0] = (u_char)(c >> 8);
 223                         src[1] = (u_char)c;
 224
 225                         ret = my_iconv_char(cd, (const u_char **)&srcp,
 226                             &inbytesleft, &dstp, &outbytesleft);
 227                         if (ret == -1) {
 228                                 table[us] = 0;
 229                                 continue;
 230                         }
 231
 232                         ud = (u_char)dst[0];
 233                         ld = (u_char)dst[1];
 234
 235                         switch(outbytesleft) {
 236                         case 0:
 237 #ifdef XLAT16_ACCEPT_3BYTE_CHR
 238                                 table[us] = (ud << 8) | ld;
 239                                 table[us] |= (u_char)dst[2] << 16;
 240                                 table[us] |= XLAT16_IS_3BYTE_CHR;
 241 #else
 242                                 table[us] = 0;
 243                                 continue;
 244 #endif
 245                                 break;
 246                         case 1:
 247                                 table[us] = quirk_unix2vendor((ud << 8) | ld,
 248                                     post_q_list, post_q_size);
 249                                 if ((table[us] >> 8) == 0)
 250                                         table[us] |= XLAT16_ACCEPT_NULL_OUT;
 251                                 break;
 252                         case 2:
 253                                 table[us] = ud;
 254                                 if (lcase & KICONV_LOWER && ud != tolower(ud)) {
 255                                         table[us] |= (u_char)tolower(ud) << 16;
 256                                         table[us] |= XLAT16_HAS_LOWER_CASE;
 257                                 }
 258                                 if (lcase & KICONV_UPPER && ud != toupper(ud)) {
 259                                         table[us] |= (u_char)toupper(ud) << 16;
 260                                         table[us] |= XLAT16_HAS_UPPER_CASE;
 261                                 }
 262                                 break;
 263                         }
 264
 265                         switch(inbytesleft) {
 266                         case 0:
 267                                 if ((ls & 0xff) == 0)
 268                                         table[us] |= XLAT16_ACCEPT_NULL_IN;
 269                                 break;
 270                         case 1:
 271                                 c = ls > 0xff ? us | 0x80 : us;
 272                                 if (lcase & KICONV_FROM_LOWER && c != tolower(c)) {
 273                                         table[us] |= (u_char)tolower(c) << 16;
 274                                         table[us] |= XLAT16_HAS_FROM_LOWER_CASE;
 275                                 }
 276                                 if (lcase & KICONV_FROM_UPPER && c != toupper(c)) {
 277                                         table[us] |= (u_char)toupper(c) << 16;
 278                                         table[us] |= XLAT16_HAS_FROM_UPPER_CASE;
 279                                 }
 280                                 break;
 281                         }
 282
 283                         if (table[us] == 0)
 284                                 continue;
 285
 286                         /*
 287                          * store not NULL
 288                          */
 289                         xt.idx[ls] = table;
 290                 }
 291                 if (xt.idx[ls]) {
 292                         memcpy(p, table, sizeof(table));
 293                         p += sizeof(table);
 294                 }
 295         }
 296         my_iconv_close(cd);
 297
 298         xt.size = p - (char *)xt.data;
 299         xt.data = realloc(xt.data, xt.size);
 300         return (xt);
 301 }
 302
 303 static int
 304 chklocale(int category, const char *code)
 305 {
 306         char *p;
 307         int error = -1;
 308
 309         p = strchr(setlocale(category, NULL), '.');
 310         if (p++) {
 311                 error = strcasecmp(code, p);
 312                 if (error) {
 313                         /* XXX - can't avoid calling quirk here... */
 314                         error = strcasecmp(code, kiconv_quirkcs(p,
 315                             KICONV_VENDOR_MICSFT));
 316                 }
 317         }
 318         return (error);
 319 }
 320
 321 #ifdef ICONV_DLOPEN
 322 static int
 323 my_iconv_init(void)
 324 {
 325         void *iconv_lib;
 326
 327         iconv_lib = dlopen("libiconv.so", RTLD_LAZY | RTLD_GLOBAL);
 328         if (iconv_lib == NULL) {
 329                 warn("Unable to load iconv library: %s\n", dlerror());
 330                 errno = ENOENT;
 331                 return (-1);
 332         }
 333         my_iconv_open = dlsym(iconv_lib, "iconv_open");
 334         my_iconv = dlsym(iconv_lib, "iconv");
 335         my_iconv_close = dlsym(iconv_lib, "iconv_close");
 336
 337         return (0);
 338 }
 339 #endif
 340
 341 static size_t
 342 my_iconv_char(iconv_t cd, const u_char **ibuf, size_t * ilen, u_char **obuf,
 343         size_t * olen)
 344 {
 345         const u_char *sp;
 346         u_char *dp, ilocal[3], olocal[3];
 347         u_char c1, c2;
 348         int ret;
 349         size_t ir, or;
 350
 351         sp = *ibuf;
 352         dp = *obuf;
 353         ir = *ilen;
 354
 355         bzero(*obuf, *olen);
 356         ret = my_iconv(cd, (const char **)&sp, ilen, (char **)&dp, olen);
 357         c1 = (*obuf)[0];
 358         c2 = (*obuf)[1];
 359
 360         if (ret == -1) {
 361                 if (*ilen == ir - 1 && (*ibuf)[1] == '\0' && (c1 || c2))
 362                         return (0);
 363                 else
 364                         return (-1);
 365         }
 366
 367         /*
 368          * We must judge if inbuf is a single byte char or double byte char.
 369          * Here, to judge, try first byte(*sp) conversion and compare.
 370          */
 371         ir = 1;
 372         or = 3;
 373
 374         bzero(olocal, or);
 375         memcpy(ilocal, *ibuf, sizeof(ilocal));
 376         sp = ilocal;
 377         dp = olocal;
 378
 379         if ((my_iconv(cd,(const char **)&sp, &ir, (char **)&dp, &or)) != -1) {
 380                 if (olocal[0] != c1)
 381                         return (ret);
 382
 383                 if (olocal[1] == c2 && (*ibuf)[1] == '\0') {
 384                         /*
 385                          * inbuf is a single byte char
 386                          */
 387                         *ilen = 1;
 388                         *olen = or;
 389                         return (ret);
 390                 }
 391
 392                 switch(or) {
 393                 case 0:
 394                 case 1:
 395                         if (olocal[1] == c2) {
 396                                 /*
 397                                  * inbuf is a single byte char,
 398                                  * so return false here.
 399                                  */
 400                                 return (-1);
 401                         } else {
 402                                 /*
 403                                  * inbuf is a double byte char
 404                                  */
 405                                 return (ret);
 406                         }
 407                         break;
 408                 case 2:
 409                         /*
 410                          * should compare second byte of inbuf
 411                          */
 412                         break;
 413                 }
 414         } else {
 415                 /*
 416                  * inbuf clould not be splitted, so inbuf is
 417                  * a double byte char.
 418                  */
 419                 return (ret);
 420         }
 421
 422         /*
 423          * try second byte(*(sp+1)) conversion, and compare
 424          */
 425         ir = 1;
 426         or = 3;
 427
 428         bzero(olocal, or);
 429
 430         sp = ilocal + 1;
 431         dp = olocal;
 432
 433         if ((my_iconv(cd,(const char **)&sp, &ir, (char **)&dp, &or)) != -1) {
 434                 if (olocal[0] == c2)
 435                         /*
 436                          * inbuf is a single byte char
 437                          */
 438                         return (-1);
 439         }
 440
 441         return (ret);
 442 }
 443
 444 #else /* statically linked */
 445
 446 #include <sys/types.h>
 447 #include <sys/iconv.h>
 448 #include <errno.h>
 449
 450 int
 451 kiconv_add_xlat16_cspair(const char *tocode __unused, const char *fromcode __unused,
 452     int flag __unused)
 453 {
 454
 455         errno = EINVAL;
 456         return (-1);
 457 }
 458
 459 int
 460 kiconv_add_xlat16_cspairs(const char *tocode __unused, const char *fromcode __unused)
 461 {
 462         errno = EINVAL;
 463         return (-1);
 464 }
 465
 466 #endif /* PIC */