release/src/router/libiconv/lib/iso2022_jp2.h

   1 /*
   2  * Copyright (C) 1999-2001, 2008 Free Software Foundation, Inc.
   3  * This file is part of the GNU LIBICONV Library.
   4  *
   5  * The GNU LIBICONV Library is free software; you can redistribute it
   6  * and/or modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * The GNU LIBICONV Library is distributed in the hope that it will be
  11  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
  18  * Fifth Floor, Boston, MA 02110-1301, USA.
  19  */
  20
  21 /*
  22  * ISO-2022-JP-2
  23  */
  24
  25 /* Specification: RFC 1554 */
  26 /* ESC '(' 'I' for JISX0201 Katakana is an extension not found in RFC 1554 or
  27    CJK.INF, but implemented in glibc-2.1 and qt-2.0. */
  28
  29 #define ESC 0x1b
  30
  31 /*
  32  * The state is composed of one of the following values
  33  */
  34 #define STATE_ASCII             0
  35 #define STATE_JISX0201ROMAN     1
  36 #define STATE_JISX0201KATAKANA  2
  37 #define STATE_JISX0208          3
  38 #define STATE_JISX0212          4
  39 #define STATE_GB2312            5
  40 #define STATE_KSC5601           6
  41 /*
  42  * and one of the following values, << 8
  43  */
  44 #define STATE_G2_NONE           0
  45 #define STATE_G2_ISO8859_1      1
  46 #define STATE_G2_ISO8859_7      2
  47
  48 #define SPLIT_STATE \
  49   unsigned int state1 = state & 0xff, state2 = state >> 8
  50 #define COMBINE_STATE \
  51   state = (state2 << 8) | state1
  52
  53 static int
  54 iso2022_jp2_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  55 {
  56   state_t state = conv->istate;
  57   SPLIT_STATE;
  58   int count = 0;
  59   unsigned char c;
  60   for (;;) {
  61     c = *s;
  62     if (c == ESC) {
  63       if (n < count+3)
  64         goto none;
  65       if (s[1] == '(') {
  66         if (s[2] == 'B') {
  67           state1 = STATE_ASCII;
  68           s += 3; count += 3;
  69           if (n < count+1)
  70             goto none;
  71           continue;
  72         }
  73         if (s[2] == 'J') {
  74           state1 = STATE_JISX0201ROMAN;
  75           s += 3; count += 3;
  76           if (n < count+1)
  77             goto none;
  78           continue;
  79         }
  80         if (s[2] == 'I') {
  81           state1 = STATE_JISX0201KATAKANA;
  82           s += 3; count += 3;
  83           if (n < count+1)
  84             goto none;
  85           continue;
  86         }
  87         goto ilseq;
  88       }
  89       if (s[1] == '$') {
  90         if (s[2] == '@' || s[2] == 'B') {
  91           /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
  92           state1 = STATE_JISX0208;
  93           s += 3; count += 3;
  94           if (n < count+1)
  95             goto none;
  96           continue;
  97         }
  98         if (s[2] == 'A') {
  99           state1 = STATE_GB2312;
 100           s += 3; count += 3;
 101           if (n < count+1)
 102             goto none;
 103           continue;
 104         }
 105         if (s[2] == '(') {
 106           if (n < count+4)
 107             goto none;
 108           if (s[3] == 'D') {
 109             state1 = STATE_JISX0212;
 110             s += 4; count += 4;
 111             if (n < count+1)
 112               goto none;
 113             continue;
 114           }
 115           if (s[3] == 'C') {
 116             state1 = STATE_KSC5601;
 117             s += 4; count += 4;
 118             if (n < count+1)
 119               goto none;
 120             continue;
 121           }
 122           goto ilseq;
 123         }
 124         goto ilseq;
 125       }
 126       if (s[1] == '.') {
 127         if (n < count+3)
 128           goto none;
 129         if (s[2] == 'A') {
 130           state2 = STATE_G2_ISO8859_1;
 131           s += 3; count += 3;
 132           if (n < count+1)
 133             goto none;
 134           continue;
 135         }
 136         if (s[2] == 'F') {
 137           state2 = STATE_G2_ISO8859_7;
 138           s += 3; count += 3;
 139           if (n < count+1)
 140             goto none;
 141           continue;
 142         }
 143         goto ilseq;
 144       }
 145       if (s[1] == 'N') {
 146         switch (state2) {
 147           case STATE_G2_NONE:
 148             goto ilseq;
 149           case STATE_G2_ISO8859_1:
 150             if (s[2] < 0x80) {
 151               unsigned char buf = s[2]+0x80;
 152               int ret = iso8859_1_mbtowc(conv,pwc,&buf,1);
 153               if (ret == RET_ILSEQ)
 154                 goto ilseq;
 155               if (ret != 1) abort();
 156               COMBINE_STATE;
 157               conv->istate = state;
 158               return count+3;
 159             } else
 160               goto ilseq;
 161           case STATE_G2_ISO8859_7:
 162             if (s[2] < 0x80) {
 163               unsigned char buf = s[2]+0x80;
 164               int ret = iso8859_7_mbtowc(conv,pwc,&buf,1);
 165               if (ret == RET_ILSEQ)
 166                 goto ilseq;
 167               if (ret != 1) abort();
 168               COMBINE_STATE;
 169               conv->istate = state;
 170               return count+3;
 171             } else
 172               goto ilseq;
 173           default: abort();
 174         }
 175       }
 176       goto ilseq;
 177     }
 178     break;
 179   }
 180   switch (state1) {
 181     case STATE_ASCII:
 182       if (c < 0x80) {
 183         int ret = ascii_mbtowc(conv,pwc,s,1);
 184         if (ret == RET_ILSEQ)
 185           goto ilseq;
 186         if (ret != 1) abort();
 187         if (*pwc == 0x000a || *pwc == 0x000d)
 188           state2 = STATE_G2_NONE;
 189         COMBINE_STATE;
 190         conv->istate = state;
 191         return count+1;
 192       } else
 193         goto ilseq;
 194     case STATE_JISX0201ROMAN:
 195       if (c < 0x80) {
 196         int ret = jisx0201_mbtowc(conv,pwc,s,1);
 197         if (ret == RET_ILSEQ)
 198           goto ilseq;
 199         if (ret != 1) abort();
 200         if (*pwc == 0x000a || *pwc == 0x000d)
 201           state2 = STATE_G2_NONE;
 202         COMBINE_STATE;
 203         conv->istate = state;
 204         return count+1;
 205       } else
 206         goto ilseq;
 207     case STATE_JISX0201KATAKANA:
 208       if (c < 0x80) {
 209         unsigned char buf = c+0x80;
 210         int ret = jisx0201_mbtowc(conv,pwc,&buf,1);
 211         if (ret == RET_ILSEQ)
 212           goto ilseq;
 213         if (ret != 1) abort();
 214         COMBINE_STATE;
 215         conv->istate = state;
 216         return count+1;
 217       } else
 218         goto ilseq;
 219     case STATE_JISX0208:
 220       if (n < count+2)
 221         goto none;
 222       if (s[0] < 0x80 && s[1] < 0x80) {
 223         int ret = jisx0208_mbtowc(conv,pwc,s,2);
 224         if (ret == RET_ILSEQ)
 225           goto ilseq;
 226         if (ret != 2) abort();
 227         COMBINE_STATE;
 228         conv->istate = state;
 229         return count+2;
 230       } else
 231         goto ilseq;
 232     case STATE_JISX0212:
 233       if (n < count+2)
 234         goto none;
 235       if (s[0] < 0x80 && s[1] < 0x80) {
 236         int ret = jisx0212_mbtowc(conv,pwc,s,2);
 237         if (ret == RET_ILSEQ)
 238           goto ilseq;
 239         if (ret != 2) abort();
 240         COMBINE_STATE;
 241         conv->istate = state;
 242         return count+2;
 243       } else
 244         goto ilseq;
 245     case STATE_GB2312:
 246       if (n < count+2)
 247         goto none;
 248       if (s[0] < 0x80 && s[1] < 0x80) {
 249         int ret = gb2312_mbtowc(conv,pwc,s,2);
 250         if (ret == RET_ILSEQ)
 251           goto ilseq;
 252         if (ret != 2) abort();
 253         COMBINE_STATE;
 254         conv->istate = state;
 255         return count+2;
 256       } else
 257         goto ilseq;
 258     case STATE_KSC5601:
 259       if (n < count+2)
 260         goto none;
 261       if (s[0] < 0x80 && s[1] < 0x80) {
 262         int ret = ksc5601_mbtowc(conv,pwc,s,2);
 263         if (ret == RET_ILSEQ)
 264           goto ilseq;
 265         if (ret != 2) abort();
 266         COMBINE_STATE;
 267         conv->istate = state;
 268         return count+2;
 269       } else
 270         goto ilseq;
 271     default: abort();
 272   }
 273
 274 none:
 275   COMBINE_STATE;
 276   conv->istate = state;
 277   return RET_TOOFEW(count);
 278
 279 ilseq:
 280   COMBINE_STATE;
 281   conv->istate = state;
 282   return RET_SHIFT_ILSEQ(count);
 283 }
 284
 285 #undef COMBINE_STATE
 286 #undef SPLIT_STATE
 287
 288 /*
 289  * The state can also contain one of the following values, << 16.
 290  * Values >= STATE_TAG_LANGUAGE are temporary tag parsing states.
 291  */
 292 #define STATE_TAG_NONE          0
 293 #define STATE_TAG_LANGUAGE      4
 294 #define STATE_TAG_LANGUAGE_j    5
 295 #define STATE_TAG_LANGUAGE_ja   1
 296 #define STATE_TAG_LANGUAGE_k    6
 297 #define STATE_TAG_LANGUAGE_ko   2
 298 #define STATE_TAG_LANGUAGE_z    7
 299 #define STATE_TAG_LANGUAGE_zh   3
 300
 301 #define SPLIT_STATE \
 302   unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = state >> 16
 303 #define COMBINE_STATE \
 304   state = (state3 << 16) | (state2 << 8) | state1
 305
 306 static int
 307 iso2022_jp2_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
 308 {
 309   state_t state = conv->ostate;
 310   SPLIT_STATE;
 311   unsigned char buf[2];
 312   int ret;
 313   /* This defines the conversion preferences depending on the current
 314      langauge tag. */
 315   enum conversion { none = 0, european, japanese, chinese, korean, other };
 316   static const unsigned int conversion_lists[STATE_TAG_LANGUAGE] = {
 317     /* STATE_TAG_NONE */
 318     japanese + (european << 3) + (chinese << 6) + (korean << 9) + (other << 12),
 319     /* STATE_TAG_LANGUAGE_ja */
 320     japanese + (european << 3) + (chinese << 6) + (korean << 9) + (other << 12),
 321     /* STATE_TAG_LANGUAGE_ko */
 322     korean + (european << 3) + (japanese << 6) + (chinese << 9) + (other << 12),
 323     /* STATE_TAG_LANGUAGE_zh */
 324     chinese + (european << 3) + (japanese << 6) + (korean << 9) + (other << 12)
 325   };
 326   unsigned int conversion_list;
 327
 328   /* Handle Unicode tag characters (range U+E0000..U+E007F). */
 329   if ((wc >> 7) == (0xe0000 >> 7)) {
 330     char c = wc & 0x7f;
 331     if (c >= 'A' && c <= 'Z')
 332       c += 'a'-'A';
 333     switch (c) {
 334       case 0x01:
 335         state3 = STATE_TAG_LANGUAGE;
 336         COMBINE_STATE;
 337         conv->ostate = state;
 338         return 0;
 339       case 'j':
 340         if (state3 == STATE_TAG_LANGUAGE) {
 341           state3 = STATE_TAG_LANGUAGE_j;
 342           COMBINE_STATE;
 343           conv->ostate = state;
 344           return 0;
 345         }
 346         break;
 347       case 'a':
 348         if (state3 == STATE_TAG_LANGUAGE_j) {
 349           state3 = STATE_TAG_LANGUAGE_ja;
 350           COMBINE_STATE;
 351           conv->ostate = state;
 352           return 0;
 353         }
 354         break;
 355       case 'k':
 356         if (state3 == STATE_TAG_LANGUAGE) {
 357           state3 = STATE_TAG_LANGUAGE_k;
 358           COMBINE_STATE;
 359           conv->ostate = state;
 360           return 0;
 361         }
 362         break;
 363       case 'o':
 364         if (state3 == STATE_TAG_LANGUAGE_k) {
 365           state3 = STATE_TAG_LANGUAGE_ko;
 366           COMBINE_STATE;
 367           conv->ostate = state;
 368           return 0;
 369         }
 370         break;
 371       case 'z':
 372         if (state3 == STATE_TAG_LANGUAGE) {
 373           state3 = STATE_TAG_LANGUAGE_z;
 374           COMBINE_STATE;
 375           conv->ostate = state;
 376           return 0;
 377         }
 378         break;
 379       case 'h':
 380         if (state3 == STATE_TAG_LANGUAGE_z) {
 381           state3 = STATE_TAG_LANGUAGE_zh;
 382           COMBINE_STATE;
 383           conv->ostate = state;
 384           return 0;
 385         }
 386         break;
 387       case 0x7f:
 388         state3 = STATE_TAG_NONE;
 389         COMBINE_STATE;
 390         conv->ostate = state;
 391         return 0;
 392       default:
 393         break;
 394     }
 395     /* Other tag characters reset the tag parsing state or are ignored. */
 396     if (state3 >= STATE_TAG_LANGUAGE)
 397       state3 = STATE_TAG_NONE;
 398     COMBINE_STATE;
 399     conv->ostate = state;
 400     return 0;
 401   }
 402   if (state3 >= STATE_TAG_LANGUAGE)
 403     state3 = STATE_TAG_NONE;
 404
 405   /* Try ASCII. */
 406   ret = ascii_wctomb(conv,buf,wc,1);
 407   if (ret != RET_ILUNI) {
 408     if (ret != 1) abort();
 409     if (buf[0] < 0x80) {
 410       int count = (state1 == STATE_ASCII ? 1 : 4);
 411       if (n < count)
 412         return RET_TOOSMALL;
 413       if (state1 != STATE_ASCII) {
 414         r[0] = ESC;
 415         r[1] = '(';
 416         r[2] = 'B';
 417         r += 3;
 418         state1 = STATE_ASCII;
 419       }
 420       r[0] = buf[0];
 421       if (wc == 0x000a || wc == 0x000d)
 422         state2 = STATE_G2_NONE;
 423       COMBINE_STATE;
 424       conv->ostate = state;
 425       return count;
 426     }
 427   }
 428
 429   conversion_list = conversion_lists[state3];
 430
 431   do {
 432     switch (conversion_list & ((1 << 3) - 1)) {
 433
 434       case european:
 435
 436         /* Try ISO-8859-1. */
 437         ret = iso8859_1_wctomb(conv,buf,wc,1);
 438         if (ret != RET_ILUNI) {
 439           if (ret != 1) abort();
 440           if (buf[0] >= 0x80) {
 441             int count = (state2 == STATE_G2_ISO8859_1 ? 3 : 6);
 442             if (n < count)
 443               return RET_TOOSMALL;
 444             if (state2 != STATE_G2_ISO8859_1) {
 445               r[0] = ESC;
 446               r[1] = '.';
 447               r[2] = 'A';
 448               r += 3;
 449               state2 = STATE_G2_ISO8859_1;
 450             }
 451             r[0] = ESC;
 452             r[1] = 'N';
 453             r[2] = buf[0]-0x80;
 454             COMBINE_STATE;
 455             conv->ostate = state;
 456             return count;
 457           }
 458         }
 459
 460         /* Try ISO-8859-7. */
 461         ret = iso8859_7_wctomb(conv,buf,wc,1);
 462         if (ret != RET_ILUNI) {
 463           if (ret != 1) abort();
 464           if (buf[0] >= 0x80) {
 465             int count = (state2 == STATE_G2_ISO8859_7 ? 3 : 6);
 466             if (n < count)
 467               return RET_TOOSMALL;
 468             if (state2 != STATE_G2_ISO8859_7) {
 469               r[0] = ESC;
 470               r[1] = '.';
 471               r[2] = 'F';
 472               r += 3;
 473               state2 = STATE_G2_ISO8859_7;
 474             }
 475             r[0] = ESC;
 476             r[1] = 'N';
 477             r[2] = buf[0]-0x80;
 478             COMBINE_STATE;
 479             conv->ostate = state;
 480             return count;
 481           }
 482         }
 483
 484         break;
 485
 486       case japanese:
 487
 488         /* Try JIS X 0201-1976 Roman. */
 489         ret = jisx0201_wctomb(conv,buf,wc,1);
 490         if (ret != RET_ILUNI) {
 491           if (ret != 1) abort();
 492           if (buf[0] < 0x80) {
 493             int count = (state1 == STATE_JISX0201ROMAN ? 1 : 4);
 494             if (n < count)
 495               return RET_TOOSMALL;
 496             if (state1 != STATE_JISX0201ROMAN) {
 497               r[0] = ESC;
 498               r[1] = '(';
 499               r[2] = 'J';
 500               r += 3;
 501               state1 = STATE_JISX0201ROMAN;
 502             }
 503             r[0] = buf[0];
 504             if (wc == 0x000a || wc == 0x000d)
 505               state2 = STATE_G2_NONE;
 506             COMBINE_STATE;
 507             conv->ostate = state;
 508             return count;
 509           }
 510         }
 511
 512         /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and
 513            JIS X 0208-1983. */
 514         ret = jisx0208_wctomb(conv,buf,wc,2);
 515         if (ret != RET_ILUNI) {
 516           if (ret != 2) abort();
 517           if (buf[0] < 0x80 && buf[1] < 0x80) {
 518             int count = (state1 == STATE_JISX0208 ? 2 : 5);
 519             if (n < count)
 520               return RET_TOOSMALL;
 521             if (state1 != STATE_JISX0208) {
 522               r[0] = ESC;
 523               r[1] = '$';
 524               r[2] = 'B';
 525               r += 3;
 526               state1 = STATE_JISX0208;
 527             }
 528             r[0] = buf[0];
 529             r[1] = buf[1];
 530             COMBINE_STATE;
 531             conv->ostate = state;
 532             return count;
 533           }
 534         }
 535
 536         /* Try JIS X 0212-1990. */
 537         ret = jisx0212_wctomb(conv,buf,wc,2);
 538         if (ret != RET_ILUNI) {
 539           if (ret != 2) abort();
 540           if (buf[0] < 0x80 && buf[1] < 0x80) {
 541             int count = (state1 == STATE_JISX0212 ? 2 : 6);
 542             if (n < count)
 543               return RET_TOOSMALL;
 544             if (state1 != STATE_JISX0212) {
 545               r[0] = ESC;
 546               r[1] = '$';
 547               r[2] = '(';
 548               r[3] = 'D';
 549               r += 4;
 550               state1 = STATE_JISX0212;
 551             }
 552             r[0] = buf[0];
 553             r[1] = buf[1];
 554             COMBINE_STATE;
 555             conv->ostate = state;
 556             return count;
 557           }
 558         }
 559
 560         break;
 561
 562       case chinese:
 563
 564         /* Try GB 2312-1980. */
 565         ret = gb2312_wctomb(conv,buf,wc,2);
 566         if (ret != RET_ILUNI) {
 567           if (ret != 2) abort();
 568           if (buf[0] < 0x80 && buf[1] < 0x80) {
 569             int count = (state1 == STATE_GB2312 ? 2 : 5);
 570             if (n < count)
 571               return RET_TOOSMALL;
 572             if (state1 != STATE_GB2312) {
 573               r[0] = ESC;
 574               r[1] = '$';
 575               r[2] = 'A';
 576               r += 3;
 577               state1 = STATE_GB2312;
 578             }
 579             r[0] = buf[0];
 580             r[1] = buf[1];
 581             COMBINE_STATE;
 582             conv->ostate = state;
 583             return count;
 584           }
 585         }
 586
 587         break;
 588
 589       case korean:
 590
 591         /* Try KS C 5601-1992. */
 592         ret = ksc5601_wctomb(conv,buf,wc,2);
 593         if (ret != RET_ILUNI) {
 594           if (ret != 2) abort();
 595           if (buf[0] < 0x80 && buf[1] < 0x80) {
 596             int count = (state1 == STATE_KSC5601 ? 2 : 6);
 597             if (n < count)
 598               return RET_TOOSMALL;
 599             if (state1 != STATE_KSC5601) {
 600               r[0] = ESC;
 601               r[1] = '$';
 602               r[2] = '(';
 603               r[3] = 'C';
 604               r += 4;
 605               state1 = STATE_KSC5601;
 606             }
 607             r[0] = buf[0];
 608             r[1] = buf[1];
 609             COMBINE_STATE;
 610             conv->ostate = state;
 611             return count;
 612           }
 613         }
 614
 615         break;
 616
 617       case other:
 618
 619         /* Try JIS X 0201-1976 Kana. This is not officially part of
 620            ISO-2022-JP-2, according to RFC 1554. Therefore we try this
 621            only after all other attempts. */
 622         ret = jisx0201_wctomb(conv,buf,wc,1);
 623         if (ret != RET_ILUNI) {
 624           if (ret != 1) abort();
 625           if (buf[0] >= 0x80) {
 626             int count = (state1 == STATE_JISX0201KATAKANA ? 1 : 4);
 627             if (n < count)
 628               return RET_TOOSMALL;
 629             if (state1 != STATE_JISX0201KATAKANA) {
 630               r[0] = ESC;
 631               r[1] = '(';
 632               r[2] = 'I';
 633               r += 3;
 634               state1 = STATE_JISX0201KATAKANA;
 635             }
 636             r[0] = buf[0]-0x80;
 637             COMBINE_STATE;
 638             conv->ostate = state;
 639             return count;
 640           }
 641         }
 642
 643         break;
 644
 645       default:
 646         abort();
 647     }
 648
 649     conversion_list = conversion_list >> 3;
 650   } while (conversion_list != 0);
 651
 652   return RET_ILUNI;
 653 }
 654
 655 static int
 656 iso2022_jp2_reset (conv_t conv, unsigned char *r, int n)
 657 {
 658   state_t state = conv->ostate;
 659   SPLIT_STATE;
 660   (void)state2;
 661   (void)state3;
 662   if (state1 != STATE_ASCII) {
 663     if (n < 3)
 664       return RET_TOOSMALL;
 665     r[0] = ESC;
 666     r[1] = '(';
 667     r[2] = 'B';
 668     /* conv->ostate = 0; will be done by the caller */
 669     return 3;
 670   } else
 671     return 0;
 672 }
 673
 674 #undef COMBINE_STATE
 675 #undef SPLIT_STATE
 676 #undef STATE_TAG_LANGUAGE_zh
 677 #undef STATE_TAG_LANGUAGE_z
 678 #undef STATE_TAG_LANGUAGE_ko
 679 #undef STATE_TAG_LANGUAGE_k
 680 #undef STATE_TAG_LANGUAGE_ja
 681 #undef STATE_TAG_LANGUAGE_j
 682 #undef STATE_TAG_LANGUAGE
 683 #undef STATE_TAG_NONE
 684 #undef STATE_G2_ISO8859_7
 685 #undef STATE_G2_ISO8859_1
 686 #undef STATE_G2_NONE
 687 #undef STATE_KSC5601
 688 #undef STATE_GB2312
 689 #undef STATE_JISX0212
 690 #undef STATE_JISX0208
 691 #undef STATE_JISX0201KATAKANA
 692 #undef STATE_JISX0201ROMAN
 693 #undef STATE_ASCII