src/libs/iconv/iso2022_cnext.h

   1 /*
   2  * Copyright (C) 1999-2001 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-CN-EXT
  23  */
  24
  25 /* Specification: RFC 1922 */
  26
  27 #define ESC 0x1b
  28 #define SO  0x0e
  29 #define SI  0x0f
  30
  31 /*
  32  * The state is composed of one of the following values
  33  */
  34 #define STATE_ASCII          0
  35 #define STATE_TWOBYTE        1
  36 /*
  37  * and one of the following values, << 8
  38  */
  39 #define STATE2_NONE                   0
  40 #define STATE2_DESIGNATED_GB2312      1
  41 #define STATE2_DESIGNATED_CNS11643_1  2
  42 #define STATE2_DESIGNATED_ISO_IR_165  3
  43 /*
  44  * and one of the following values, << 16
  45  */
  46 #define STATE3_NONE                   0
  47 #define STATE3_DESIGNATED_CNS11643_2  1
  48 /*
  49  * and one of the following values, << 24
  50  */
  51 #define STATE4_NONE                   0
  52 #define STATE4_DESIGNATED_CNS11643_3  1
  53 #define STATE4_DESIGNATED_CNS11643_4  2
  54 #define STATE4_DESIGNATED_CNS11643_5  3
  55 #define STATE4_DESIGNATED_CNS11643_6  4
  56 #define STATE4_DESIGNATED_CNS11643_7  5
  57
  58 #define SPLIT_STATE \
  59   unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = (state >> 16) & 0xff, state4 = state >> 24
  60 #define COMBINE_STATE \
  61   state = (state4 << 24) | (state3 << 16) | (state2 << 8) | state1
  62
  63 static int
  64 iso2022_cn_ext_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  65 {
  66   state_t state = conv->istate;
  67   SPLIT_STATE;
  68   int count = 0;
  69   unsigned char c;
  70   for (;;) {
  71     c = *s;
  72     if (c == ESC) {
  73       if (n < count+4)
  74         goto none;
  75       if (s[1] == '$') {
  76         if (s[2] == ')') {
  77           if (s[3] == 'A') {
  78             state2 = STATE2_DESIGNATED_GB2312;
  79             s += 4; count += 4;
  80             if (n < count+1)
  81               goto none;
  82             continue;
  83           }
  84           if (s[3] == 'G') {
  85             state2 = STATE2_DESIGNATED_CNS11643_1;
  86             s += 4; count += 4;
  87             if (n < count+1)
  88               goto none;
  89             continue;
  90           }
  91           if (s[3] == 'E') {
  92             state2 = STATE2_DESIGNATED_ISO_IR_165;
  93             s += 4; count += 4;
  94             if (n < count+1)
  95               goto none;
  96             continue;
  97           }
  98         }
  99         if (s[2] == '*') {
 100           if (s[3] == 'H') {
 101             state3 = STATE3_DESIGNATED_CNS11643_2;
 102             s += 4; count += 4;
 103             if (n < count+1)
 104               goto none;
 105             continue;
 106           }
 107         }
 108         if (s[2] == '+') {
 109           if (s[3] == 'I') {
 110             state4 = STATE4_DESIGNATED_CNS11643_3;
 111             s += 4; count += 4;
 112             if (n < count+1)
 113               goto none;
 114             continue;
 115           }
 116           if (s[3] == 'J') {
 117             state4 = STATE4_DESIGNATED_CNS11643_4;
 118             s += 4; count += 4;
 119             if (n < count+1)
 120               goto none;
 121             continue;
 122           }
 123           if (s[3] == 'K') {
 124             state4 = STATE4_DESIGNATED_CNS11643_5;
 125             s += 4; count += 4;
 126             if (n < count+1)
 127               goto none;
 128             continue;
 129           }
 130           if (s[3] == 'L') {
 131             state4 = STATE4_DESIGNATED_CNS11643_6;
 132             s += 4; count += 4;
 133             if (n < count+1)
 134               goto none;
 135             continue;
 136           }
 137           if (s[3] == 'M') {
 138             state4 = STATE4_DESIGNATED_CNS11643_7;
 139             s += 4; count += 4;
 140             if (n < count+1)
 141               goto none;
 142             continue;
 143           }
 144         }
 145       }
 146       if (s[1] == 'N') {
 147         switch (state3) {
 148           case STATE3_NONE:
 149             return RET_ILSEQ;
 150           case STATE3_DESIGNATED_CNS11643_2:
 151             if (s[2] < 0x80 && s[3] < 0x80) {
 152               int ret = cns11643_2_mbtowc(conv,pwc,s+2,2);
 153               if (ret == RET_ILSEQ)
 154                 return RET_ILSEQ;
 155               if (ret != 2) abort();
 156               COMBINE_STATE;
 157               conv->istate = state;
 158               return count+4;
 159             } else
 160               return RET_ILSEQ;
 161           default: abort();
 162         }
 163       }
 164       if (s[1] == 'O') {
 165         switch (state4) {
 166           case STATE4_NONE:
 167             return RET_ILSEQ;
 168           case STATE4_DESIGNATED_CNS11643_3:
 169             if (s[2] < 0x80 && s[3] < 0x80) {
 170               int ret = cns11643_3_mbtowc(conv,pwc,s+2,2);
 171               if (ret == RET_ILSEQ)
 172                 return RET_ILSEQ;
 173               if (ret != 2) abort();
 174               COMBINE_STATE;
 175               conv->istate = state;
 176               return count+4;
 177             } else
 178               return RET_ILSEQ;
 179           case STATE4_DESIGNATED_CNS11643_4:
 180             if (s[2] < 0x80 && s[3] < 0x80) {
 181               int ret = cns11643_4_mbtowc(conv,pwc,s+2,2);
 182               if (ret == RET_ILSEQ)
 183                 return RET_ILSEQ;
 184               if (ret != 2) abort();
 185               COMBINE_STATE;
 186               conv->istate = state;
 187               return count+4;
 188             } else
 189               return RET_ILSEQ;
 190           case STATE4_DESIGNATED_CNS11643_5:
 191             if (s[2] < 0x80 && s[3] < 0x80) {
 192               int ret = cns11643_5_mbtowc(conv,pwc,s+2,2);
 193               if (ret == RET_ILSEQ)
 194                 return RET_ILSEQ;
 195               if (ret != 2) abort();
 196               COMBINE_STATE;
 197               conv->istate = state;
 198               return count+4;
 199             } else
 200               return RET_ILSEQ;
 201           case STATE4_DESIGNATED_CNS11643_6:
 202             if (s[2] < 0x80 && s[3] < 0x80) {
 203               int ret = cns11643_6_mbtowc(conv,pwc,s+2,2);
 204               if (ret == RET_ILSEQ)
 205                 return RET_ILSEQ;
 206               if (ret != 2) abort();
 207               COMBINE_STATE;
 208               conv->istate = state;
 209               return count+4;
 210             } else
 211               return RET_ILSEQ;
 212           case STATE4_DESIGNATED_CNS11643_7:
 213             if (s[2] < 0x80 && s[3] < 0x80) {
 214               int ret = cns11643_7_mbtowc(conv,pwc,s+2,2);
 215               if (ret == RET_ILSEQ)
 216                 return RET_ILSEQ;
 217               if (ret != 2) abort();
 218               COMBINE_STATE;
 219               conv->istate = state;
 220               return count+4;
 221             } else
 222               return RET_ILSEQ;
 223           default: abort();
 224         }
 225       }
 226       return RET_ILSEQ;
 227     }
 228     if (c == SO) {
 229       if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1 && state2 != STATE2_DESIGNATED_ISO_IR_165)
 230         return RET_ILSEQ;
 231       state1 = STATE_TWOBYTE;
 232       s++; count++;
 233       if (n < count+1)
 234         goto none;
 235       continue;
 236     }
 237     if (c == SI) {
 238       state1 = STATE_ASCII;
 239       s++; count++;
 240       if (n < count+1)
 241         goto none;
 242       continue;
 243     }
 244     break;
 245   }
 246   switch (state1) {
 247     case STATE_ASCII:
 248       if (c < 0x80) {
 249         int ret = ascii_mbtowc(conv,pwc,s,1);
 250         if (ret == RET_ILSEQ)
 251           return RET_ILSEQ;
 252         if (ret != 1) abort();
 253         if (*pwc == 0x000a || *pwc == 0x000d) {
 254           state2 = STATE2_NONE; state3 = STATE3_NONE; state4 = STATE3_NONE;
 255         }
 256         COMBINE_STATE;
 257         conv->istate = state;
 258         return count+1;
 259       } else
 260         return RET_ILSEQ;
 261     case STATE_TWOBYTE:
 262       if (n < count+2)
 263         goto none;
 264       if (s[0] < 0x80 && s[1] < 0x80) {
 265         int ret;
 266         switch (state2) {
 267           case STATE2_NONE:
 268             return RET_ILSEQ;
 269           case STATE2_DESIGNATED_GB2312:
 270             ret = gb2312_mbtowc(conv,pwc,s,2); break;
 271           case STATE2_DESIGNATED_CNS11643_1:
 272             ret = cns11643_1_mbtowc(conv,pwc,s,2); break;
 273           case STATE2_DESIGNATED_ISO_IR_165:
 274             ret = isoir165_mbtowc(conv,pwc,s,2); break;
 275           default: abort();
 276         }
 277         if (ret == RET_ILSEQ)
 278           return RET_ILSEQ;
 279         if (ret != 2) abort();
 280         COMBINE_STATE;
 281         conv->istate = state;
 282         return count+2;
 283       } else
 284         return RET_ILSEQ;
 285     default: abort();
 286   }
 287
 288 none:
 289   COMBINE_STATE;
 290   conv->istate = state;
 291   return RET_TOOFEW(count);
 292 }
 293
 294 static int
 295 iso2022_cn_ext_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
 296 {
 297   state_t state = conv->ostate;
 298   SPLIT_STATE;
 299   unsigned char buf[3];
 300   int ret;
 301
 302   /* There is no need to handle Unicode 3.1 tag characters and to look for
 303      "zh-CN" or "zh-TW" tags, because GB2312 and CNS11643 are disjoint. */
 304
 305   /* Try ASCII. */
 306   ret = ascii_wctomb(conv,buf,wc,1);
 307   if (ret != RET_ILUNI) {
 308     if (ret != 1) abort();
 309     if (buf[0] < 0x80) {
 310       int count = (state1 == STATE_ASCII ? 1 : 2);
 311       if (n < count)
 312         return RET_TOOSMALL;
 313       if (state1 != STATE_ASCII) {
 314         r[0] = SI;
 315         r += 1;
 316         state1 = STATE_ASCII;
 317       }
 318       r[0] = buf[0];
 319       if (wc == 0x000a || wc == 0x000d) {
 320         state2 = STATE2_NONE; state3 = STATE3_NONE; state4 = STATE3_NONE;
 321       }
 322       COMBINE_STATE;
 323       conv->ostate = state;
 324       return count;
 325     }
 326   }
 327
 328   /* Try GB 2312-1980. */
 329   ret = gb2312_wctomb(conv,buf,wc,2);
 330   if (ret != RET_ILUNI) {
 331     if (ret != 2) abort();
 332     if (buf[0] < 0x80 && buf[1] < 0x80) {
 333       int count = (state2 == STATE2_DESIGNATED_GB2312 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
 334       if (n < count)
 335         return RET_TOOSMALL;
 336       if (state2 != STATE2_DESIGNATED_GB2312) {
 337         r[0] = ESC;
 338         r[1] = '$';
 339         r[2] = ')';
 340         r[3] = 'A';
 341         r += 4;
 342         state2 = STATE2_DESIGNATED_GB2312;
 343       }
 344       if (state1 != STATE_TWOBYTE) {
 345         r[0] = SO;
 346         r += 1;
 347         state1 = STATE_TWOBYTE;
 348       }
 349       r[0] = buf[0];
 350       r[1] = buf[1];
 351       COMBINE_STATE;
 352       conv->ostate = state;
 353       return count;
 354     }
 355   }
 356
 357   ret = cns11643_wctomb(conv,buf,wc,3);
 358   if (ret != RET_ILUNI) {
 359     if (ret != 3) abort();
 360
 361     /* Try CNS 11643-1992 Plane 1. */
 362     if (buf[0] == 1 && buf[1] < 0x80 && buf[2] < 0x80) {
 363       int count = (state2 == STATE2_DESIGNATED_CNS11643_1 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
 364       if (n < count)
 365         return RET_TOOSMALL;
 366       if (state2 != STATE2_DESIGNATED_CNS11643_1) {
 367         r[0] = ESC;
 368         r[1] = '$';
 369         r[2] = ')';
 370         r[3] = 'G';
 371         r += 4;
 372         state2 = STATE2_DESIGNATED_CNS11643_1;
 373       }
 374       if (state1 != STATE_TWOBYTE) {
 375         r[0] = SO;
 376         r += 1;
 377         state1 = STATE_TWOBYTE;
 378       }
 379       r[0] = buf[1];
 380       r[1] = buf[2];
 381       COMBINE_STATE;
 382       conv->ostate = state;
 383       return count;
 384     }
 385
 386     /* Try CNS 11643-1992 Plane 2. */
 387     if (buf[0] == 2 && buf[1] < 0x80 && buf[2] < 0x80) {
 388       int count = (state3 == STATE3_DESIGNATED_CNS11643_2 ? 0 : 4) + 4;
 389       if (n < count)
 390         return RET_TOOSMALL;
 391       if (state3 != STATE3_DESIGNATED_CNS11643_2) {
 392         r[0] = ESC;
 393         r[1] = '$';
 394         r[2] = '*';
 395         r[3] = 'H';
 396         r += 4;
 397         state3 = STATE3_DESIGNATED_CNS11643_2;
 398       }
 399       r[0] = ESC;
 400       r[1] = 'N';
 401       r[2] = buf[1];
 402       r[3] = buf[2];
 403       COMBINE_STATE;
 404       conv->ostate = state;
 405       return count;
 406     }
 407
 408     /* Try CNS 11643-1992 Plane 3. */
 409     if (buf[0] == 3 && buf[1] < 0x80 && buf[2] < 0x80) {
 410       int count = (state4 == STATE4_DESIGNATED_CNS11643_3 ? 0 : 4) + 4;
 411       if (n < count)
 412         return RET_TOOSMALL;
 413       if (state4 != STATE4_DESIGNATED_CNS11643_3) {
 414         r[0] = ESC;
 415         r[1] = '$';
 416         r[2] = '+';
 417         r[3] = 'I';
 418         r += 4;
 419         state4 = STATE4_DESIGNATED_CNS11643_3;
 420       }
 421       r[0] = ESC;
 422       r[1] = 'O';
 423       r[2] = buf[1];
 424       r[3] = buf[2];
 425       COMBINE_STATE;
 426       conv->ostate = state;
 427       return count;
 428     }
 429
 430     /* Try CNS 11643-1992 Plane 4. */
 431     if (buf[0] == 4 && buf[1] < 0x80 && buf[2] < 0x80) {
 432       int count = (state4 == STATE4_DESIGNATED_CNS11643_4 ? 0 : 4) + 4;
 433       if (n < count)
 434         return RET_TOOSMALL;
 435       if (state4 != STATE4_DESIGNATED_CNS11643_4) {
 436         r[0] = ESC;
 437         r[1] = '$';
 438         r[2] = '+';
 439         r[3] = 'J';
 440         r += 4;
 441         state4 = STATE4_DESIGNATED_CNS11643_4;
 442       }
 443       r[0] = ESC;
 444       r[1] = 'O';
 445       r[2] = buf[1];
 446       r[3] = buf[2];
 447       COMBINE_STATE;
 448       conv->ostate = state;
 449       return count;
 450     }
 451
 452     /* Try CNS 11643-1992 Plane 5. */
 453     if (buf[0] == 5 && buf[1] < 0x80 && buf[2] < 0x80) {
 454       int count = (state4 == STATE4_DESIGNATED_CNS11643_5 ? 0 : 4) + 4;
 455       if (n < count)
 456         return RET_TOOSMALL;
 457       if (state4 != STATE4_DESIGNATED_CNS11643_5) {
 458         r[0] = ESC;
 459         r[1] = '$';
 460         r[2] = '+';
 461         r[3] = 'K';
 462         r += 4;
 463         state4 = STATE4_DESIGNATED_CNS11643_5;
 464       }
 465       r[0] = ESC;
 466       r[1] = 'O';
 467       r[2] = buf[1];
 468       r[3] = buf[2];
 469       COMBINE_STATE;
 470       conv->ostate = state;
 471       return count;
 472     }
 473
 474     /* Try CNS 11643-1992 Plane 6. */
 475     if (buf[0] == 6 && buf[1] < 0x80 && buf[2] < 0x80) {
 476       int count = (state4 == STATE4_DESIGNATED_CNS11643_6 ? 0 : 4) + 4;
 477       if (n < count)
 478         return RET_TOOSMALL;
 479       if (state4 != STATE4_DESIGNATED_CNS11643_6) {
 480         r[0] = ESC;
 481         r[1] = '$';
 482         r[2] = '+';
 483         r[3] = 'L';
 484         r += 4;
 485         state4 = STATE4_DESIGNATED_CNS11643_6;
 486       }
 487       r[0] = ESC;
 488       r[1] = 'O';
 489       r[2] = buf[1];
 490       r[3] = buf[2];
 491       COMBINE_STATE;
 492       conv->ostate = state;
 493       return count;
 494     }
 495
 496     /* Try CNS 11643-1992 Plane 7. */
 497     if (buf[0] == 7 && buf[1] < 0x80 && buf[2] < 0x80) {
 498       int count = (state4 == STATE4_DESIGNATED_CNS11643_7 ? 0 : 4) + 4;
 499       if (n < count)
 500         return RET_TOOSMALL;
 501       if (state4 != STATE4_DESIGNATED_CNS11643_7) {
 502         r[0] = ESC;
 503         r[1] = '$';
 504         r[2] = '+';
 505         r[3] = 'M';
 506         r += 4;
 507         state4 = STATE4_DESIGNATED_CNS11643_7;
 508       }
 509       r[0] = ESC;
 510       r[1] = 'O';
 511       r[2] = buf[1];
 512       r[3] = buf[2];
 513       COMBINE_STATE;
 514       conv->ostate = state;
 515       return count;
 516     }
 517
 518   }
 519
 520   /* Try ISO-IR-165. */
 521   ret = isoir165_wctomb(conv,buf,wc,2);
 522   if (ret != RET_ILUNI) {
 523     if (ret != 2) abort();
 524     if (buf[0] < 0x80 && buf[1] < 0x80) {
 525       int count = (state2 == STATE2_DESIGNATED_ISO_IR_165 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
 526       if (n < count)
 527         return RET_TOOSMALL;
 528       if (state2 != STATE2_DESIGNATED_ISO_IR_165) {
 529         r[0] = ESC;
 530         r[1] = '$';
 531         r[2] = ')';
 532         r[3] = 'E';
 533         r += 4;
 534         state2 = STATE2_DESIGNATED_ISO_IR_165;
 535       }
 536       if (state1 != STATE_TWOBYTE) {
 537         r[0] = SO;
 538         r += 1;
 539         state1 = STATE_TWOBYTE;
 540       }
 541       r[0] = buf[0];
 542       r[1] = buf[1];
 543       COMBINE_STATE;
 544       conv->ostate = state;
 545       return count;
 546     }
 547   }
 548
 549   return RET_ILUNI;
 550 }
 551
 552 static int
 553 iso2022_cn_ext_reset (conv_t conv, unsigned char *r, int n)
 554 {
 555   state_t state = conv->ostate;
 556   SPLIT_STATE;
 557   (void)state2;
 558   (void)state3;
 559   (void)state4;
 560   if (state1 != STATE_ASCII) {
 561     if (n < 1)
 562       return RET_TOOSMALL;
 563     r[0] = SI;
 564     /* conv->ostate = 0; will be done by the caller */
 565     return 1;
 566   } else
 567     return 0;
 568 }
 569
 570 #undef COMBINE_STATE
 571 #undef SPLIT_STATE
 572 #undef STATE4_DESIGNATED_CNS11643_7
 573 #undef STATE4_DESIGNATED_CNS11643_6
 574 #undef STATE4_DESIGNATED_CNS11643_5
 575 #undef STATE4_DESIGNATED_CNS11643_4
 576 #undef STATE4_DESIGNATED_CNS11643_3
 577 #undef STATE4_NONE
 578 #undef STATE3_DESIGNATED_CNS11643_2
 579 #undef STATE3_NONE
 580 #undef STATE2_DESIGNATED_ISO_IR_165
 581 #undef STATE2_DESIGNATED_CNS11643_1
 582 #undef STATE2_DESIGNATED_GB2312
 583 #undef STATE2_NONE
 584 #undef STATE_TWOBYTE
 585 #undef STATE_ASCII