release/src/router/libiconv/lib/iso2022_cnext.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-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             goto 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                 goto ilseq;
 155               if (ret != 2) abort();
 156               COMBINE_STATE;
 157               conv->istate = state;
 158               return count+4;
 159             } else
 160               goto ilseq;
 161           default: abort();
 162         }
 163       }
 164       if (s[1] == 'O') {
 165         switch (state4) {
 166           case STATE4_NONE:
 167             goto 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                 goto ilseq;
 173               if (ret != 2) abort();
 174               COMBINE_STATE;
 175               conv->istate = state;
 176               return count+4;
 177             } else
 178               goto 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                 goto ilseq;
 184               if (ret != 2) abort();
 185               COMBINE_STATE;
 186               conv->istate = state;
 187               return count+4;
 188             } else
 189               goto 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                 goto ilseq;
 195               if (ret != 2) abort();
 196               COMBINE_STATE;
 197               conv->istate = state;
 198               return count+4;
 199             } else
 200               goto 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                 goto ilseq;
 206               if (ret != 2) abort();
 207               COMBINE_STATE;
 208               conv->istate = state;
 209               return count+4;
 210             } else
 211               goto 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                 goto ilseq;
 217               if (ret != 2) abort();
 218               COMBINE_STATE;
 219               conv->istate = state;
 220               return count+4;
 221             } else
 222               goto ilseq;
 223           default: abort();
 224         }
 225       }
 226       goto ilseq;
 227     }
 228     if (c == SO) {
 229       if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1 && state2 != STATE2_DESIGNATED_ISO_IR_165)
 230         goto 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           goto 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         goto 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             goto 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           goto ilseq;
 279         if (ret != 2) abort();
 280         COMBINE_STATE;
 281         conv->istate = state;
 282         return count+2;
 283       } else
 284         goto ilseq;
 285     default: abort();
 286   }
 287
 288 none:
 289   COMBINE_STATE;
 290   conv->istate = state;
 291   return RET_TOOFEW(count);
 292
 293 ilseq:
 294   COMBINE_STATE;
 295   conv->istate = state;
 296   return RET_SHIFT_ILSEQ(count);
 297 }
 298
 299 static int
 300 iso2022_cn_ext_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
 301 {
 302   state_t state = conv->ostate;
 303   SPLIT_STATE;
 304   unsigned char buf[3];
 305   int ret;
 306
 307   /* There is no need to handle Unicode 3.1 tag characters and to look for
 308      "zh-CN" or "zh-TW" tags, because GB2312 and CNS11643 are disjoint. */
 309
 310   /* Try ASCII. */
 311   ret = ascii_wctomb(conv,buf,wc,1);
 312   if (ret != RET_ILUNI) {
 313     if (ret != 1) abort();
 314     if (buf[0] < 0x80) {
 315       int count = (state1 == STATE_ASCII ? 1 : 2);
 316       if (n < count)
 317         return RET_TOOSMALL;
 318       if (state1 != STATE_ASCII) {
 319         r[0] = SI;
 320         r += 1;
 321         state1 = STATE_ASCII;
 322       }
 323       r[0] = buf[0];
 324       if (wc == 0x000a || wc == 0x000d) {
 325         state2 = STATE2_NONE; state3 = STATE3_NONE; state4 = STATE3_NONE;
 326       }
 327       COMBINE_STATE;
 328       conv->ostate = state;
 329       return count;
 330     }
 331   }
 332
 333   /* Try GB 2312-1980. */
 334   ret = gb2312_wctomb(conv,buf,wc,2);
 335   if (ret != RET_ILUNI) {
 336     if (ret != 2) abort();
 337     if (buf[0] < 0x80 && buf[1] < 0x80) {
 338       int count = (state2 == STATE2_DESIGNATED_GB2312 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
 339       if (n < count)
 340         return RET_TOOSMALL;
 341       if (state2 != STATE2_DESIGNATED_GB2312) {
 342         r[0] = ESC;
 343         r[1] = '$';
 344         r[2] = ')';
 345         r[3] = 'A';
 346         r += 4;
 347         state2 = STATE2_DESIGNATED_GB2312;
 348       }
 349       if (state1 != STATE_TWOBYTE) {
 350         r[0] = SO;
 351         r += 1;
 352         state1 = STATE_TWOBYTE;
 353       }
 354       r[0] = buf[0];
 355       r[1] = buf[1];
 356       COMBINE_STATE;
 357       conv->ostate = state;
 358       return count;
 359     }
 360   }
 361
 362   ret = cns11643_wctomb(conv,buf,wc,3);
 363   if (ret != RET_ILUNI) {
 364     if (ret != 3) abort();
 365
 366     /* Try CNS 11643-1992 Plane 1. */
 367     if (buf[0] == 1 && buf[1] < 0x80 && buf[2] < 0x80) {
 368       int count = (state2 == STATE2_DESIGNATED_CNS11643_1 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
 369       if (n < count)
 370         return RET_TOOSMALL;
 371       if (state2 != STATE2_DESIGNATED_CNS11643_1) {
 372         r[0] = ESC;
 373         r[1] = '$';
 374         r[2] = ')';
 375         r[3] = 'G';
 376         r += 4;
 377         state2 = STATE2_DESIGNATED_CNS11643_1;
 378       }
 379       if (state1 != STATE_TWOBYTE) {
 380         r[0] = SO;
 381         r += 1;
 382         state1 = STATE_TWOBYTE;
 383       }
 384       r[0] = buf[1];
 385       r[1] = buf[2];
 386       COMBINE_STATE;
 387       conv->ostate = state;
 388       return count;
 389     }
 390
 391     /* Try CNS 11643-1992 Plane 2. */
 392     if (buf[0] == 2 && buf[1] < 0x80 && buf[2] < 0x80) {
 393       int count = (state3 == STATE3_DESIGNATED_CNS11643_2 ? 0 : 4) + 4;
 394       if (n < count)
 395         return RET_TOOSMALL;
 396       if (state3 != STATE3_DESIGNATED_CNS11643_2) {
 397         r[0] = ESC;
 398         r[1] = '$';
 399         r[2] = '*';
 400         r[3] = 'H';
 401         r += 4;
 402         state3 = STATE3_DESIGNATED_CNS11643_2;
 403       }
 404       r[0] = ESC;
 405       r[1] = 'N';
 406       r[2] = buf[1];
 407       r[3] = buf[2];
 408       COMBINE_STATE;
 409       conv->ostate = state;
 410       return count;
 411     }
 412
 413     /* Try CNS 11643-1992 Plane 3. */
 414     if (buf[0] == 3 && buf[1] < 0x80 && buf[2] < 0x80) {
 415       int count = (state4 == STATE4_DESIGNATED_CNS11643_3 ? 0 : 4) + 4;
 416       if (n < count)
 417         return RET_TOOSMALL;
 418       if (state4 != STATE4_DESIGNATED_CNS11643_3) {
 419         r[0] = ESC;
 420         r[1] = '$';
 421         r[2] = '+';
 422         r[3] = 'I';
 423         r += 4;
 424         state4 = STATE4_DESIGNATED_CNS11643_3;
 425       }
 426       r[0] = ESC;
 427       r[1] = 'O';
 428       r[2] = buf[1];
 429       r[3] = buf[2];
 430       COMBINE_STATE;
 431       conv->ostate = state;
 432       return count;
 433     }
 434
 435     /* Try CNS 11643-1992 Plane 4. */
 436     if (buf[0] == 4 && buf[1] < 0x80 && buf[2] < 0x80) {
 437       int count = (state4 == STATE4_DESIGNATED_CNS11643_4 ? 0 : 4) + 4;
 438       if (n < count)
 439         return RET_TOOSMALL;
 440       if (state4 != STATE4_DESIGNATED_CNS11643_4) {
 441         r[0] = ESC;
 442         r[1] = '$';
 443         r[2] = '+';
 444         r[3] = 'J';
 445         r += 4;
 446         state4 = STATE4_DESIGNATED_CNS11643_4;
 447       }
 448       r[0] = ESC;
 449       r[1] = 'O';
 450       r[2] = buf[1];
 451       r[3] = buf[2];
 452       COMBINE_STATE;
 453       conv->ostate = state;
 454       return count;
 455     }
 456
 457     /* Try CNS 11643-1992 Plane 5. */
 458     if (buf[0] == 5 && buf[1] < 0x80 && buf[2] < 0x80) {
 459       int count = (state4 == STATE4_DESIGNATED_CNS11643_5 ? 0 : 4) + 4;
 460       if (n < count)
 461         return RET_TOOSMALL;
 462       if (state4 != STATE4_DESIGNATED_CNS11643_5) {
 463         r[0] = ESC;
 464         r[1] = '$';
 465         r[2] = '+';
 466         r[3] = 'K';
 467         r += 4;
 468         state4 = STATE4_DESIGNATED_CNS11643_5;
 469       }
 470       r[0] = ESC;
 471       r[1] = 'O';
 472       r[2] = buf[1];
 473       r[3] = buf[2];
 474       COMBINE_STATE;
 475       conv->ostate = state;
 476       return count;
 477     }
 478
 479     /* Try CNS 11643-1992 Plane 6. */
 480     if (buf[0] == 6 && buf[1] < 0x80 && buf[2] < 0x80) {
 481       int count = (state4 == STATE4_DESIGNATED_CNS11643_6 ? 0 : 4) + 4;
 482       if (n < count)
 483         return RET_TOOSMALL;
 484       if (state4 != STATE4_DESIGNATED_CNS11643_6) {
 485         r[0] = ESC;
 486         r[1] = '$';
 487         r[2] = '+';
 488         r[3] = 'L';
 489         r += 4;
 490         state4 = STATE4_DESIGNATED_CNS11643_6;
 491       }
 492       r[0] = ESC;
 493       r[1] = 'O';
 494       r[2] = buf[1];
 495       r[3] = buf[2];
 496       COMBINE_STATE;
 497       conv->ostate = state;
 498       return count;
 499     }
 500
 501     /* Try CNS 11643-1992 Plane 7. */
 502     if (buf[0] == 7 && buf[1] < 0x80 && buf[2] < 0x80) {
 503       int count = (state4 == STATE4_DESIGNATED_CNS11643_7 ? 0 : 4) + 4;
 504       if (n < count)
 505         return RET_TOOSMALL;
 506       if (state4 != STATE4_DESIGNATED_CNS11643_7) {
 507         r[0] = ESC;
 508         r[1] = '$';
 509         r[2] = '+';
 510         r[3] = 'M';
 511         r += 4;
 512         state4 = STATE4_DESIGNATED_CNS11643_7;
 513       }
 514       r[0] = ESC;
 515       r[1] = 'O';
 516       r[2] = buf[1];
 517       r[3] = buf[2];
 518       COMBINE_STATE;
 519       conv->ostate = state;
 520       return count;
 521     }
 522
 523   }
 524
 525   /* Try ISO-IR-165. */
 526   ret = isoir165_wctomb(conv,buf,wc,2);
 527   if (ret != RET_ILUNI) {
 528     if (ret != 2) abort();
 529     if (buf[0] < 0x80 && buf[1] < 0x80) {
 530       int count = (state2 == STATE2_DESIGNATED_ISO_IR_165 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
 531       if (n < count)
 532         return RET_TOOSMALL;
 533       if (state2 != STATE2_DESIGNATED_ISO_IR_165) {
 534         r[0] = ESC;
 535         r[1] = '$';
 536         r[2] = ')';
 537         r[3] = 'E';
 538         r += 4;
 539         state2 = STATE2_DESIGNATED_ISO_IR_165;
 540       }
 541       if (state1 != STATE_TWOBYTE) {
 542         r[0] = SO;
 543         r += 1;
 544         state1 = STATE_TWOBYTE;
 545       }
 546       r[0] = buf[0];
 547       r[1] = buf[1];
 548       COMBINE_STATE;
 549       conv->ostate = state;
 550       return count;
 551     }
 552   }
 553
 554   return RET_ILUNI;
 555 }
 556
 557 static int
 558 iso2022_cn_ext_reset (conv_t conv, unsigned char *r, int n)
 559 {
 560   state_t state = conv->ostate;
 561   SPLIT_STATE;
 562   (void)state2;
 563   (void)state3;
 564   (void)state4;
 565   if (state1 != STATE_ASCII) {
 566     if (n < 1)
 567       return RET_TOOSMALL;
 568     r[0] = SI;
 569     /* conv->ostate = 0; will be done by the caller */
 570     return 1;
 571   } else
 572     return 0;
 573 }
 574
 575 #undef COMBINE_STATE
 576 #undef SPLIT_STATE
 577 #undef STATE4_DESIGNATED_CNS11643_7
 578 #undef STATE4_DESIGNATED_CNS11643_6
 579 #undef STATE4_DESIGNATED_CNS11643_5
 580 #undef STATE4_DESIGNATED_CNS11643_4
 581 #undef STATE4_DESIGNATED_CNS11643_3
 582 #undef STATE4_NONE
 583 #undef STATE3_DESIGNATED_CNS11643_2
 584 #undef STATE3_NONE
 585 #undef STATE2_DESIGNATED_ISO_IR_165
 586 #undef STATE2_DESIGNATED_CNS11643_1
 587 #undef STATE2_DESIGNATED_GB2312
 588 #undef STATE2_NONE
 589 #undef STATE_TWOBYTE
 590 #undef STATE_ASCII