release/src/router/libiconv/lib/iso2022_jp3.h

   1 /*
   2  * Copyright (C) 1999-2004, 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-3
  23  */
  24
  25 #include "jisx0213.h"
  26
  27 #define ESC 0x1b
  28
  29 /*
  30  * The state is composed of one of the following values
  31  */
  32 #define STATE_ASCII             0  /* Esc ( B */
  33 #define STATE_JISX0201ROMAN     1  /* Esc ( J */
  34 #define STATE_JISX0201KATAKANA  2  /* Esc ( I */
  35 #define STATE_JISX0208          3  /* Esc $ @ or Esc $ B */
  36 #define STATE_JISX02131         4  /* Esc $ ( O or Esc $ ( Q*/
  37 #define STATE_JISX02132         5  /* Esc $ ( P */
  38
  39 /*
  40  * In the ISO-2022-JP-3 to UCS-4 direction, the state also holds the last
  41  * character to be output, shifted by 3 bits.
  42  */
  43
  44 static int
  45 iso2022_jp3_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  46 {
  47   ucs4_t last_wc = conv->istate >> 3;
  48   if (last_wc) {
  49     /* Output the buffered character. */
  50     conv->istate &= 7;
  51     *pwc = last_wc;
  52     return 0; /* Don't advance the input pointer. */
  53   } else {
  54     state_t state = conv->istate;
  55     int count = 0;
  56     unsigned char c;
  57     for (;;) {
  58       c = *s;
  59       if (c == ESC) {
  60         if (n < count+3)
  61           goto none;
  62         if (s[1] == '(') {
  63           if (s[2] == 'B') {
  64             state = STATE_ASCII;
  65             s += 3; count += 3;
  66             if (n < count+1)
  67               goto none;
  68             continue;
  69           }
  70           if (s[2] == 'J') {
  71             state = STATE_JISX0201ROMAN;
  72             s += 3; count += 3;
  73             if (n < count+1)
  74               goto none;
  75             continue;
  76           }
  77           if (s[2] == 'I') {
  78             state = STATE_JISX0201KATAKANA;
  79             s += 3; count += 3;
  80             if (n < count+1)
  81               goto none;
  82             continue;
  83           }
  84           goto ilseq;
  85         }
  86         if (s[1] == '$') {
  87           if (s[2] == '@' || s[2] == 'B') {
  88             /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
  89             state = STATE_JISX0208;
  90             s += 3; count += 3;
  91             if (n < count+1)
  92               goto none;
  93             continue;
  94           }
  95           if (s[2] == '(') {
  96             if (n < count+4)
  97               goto none;
  98             if (s[3] == 'O' || s[3] == 'Q') {
  99               state = STATE_JISX02131;
 100               s += 4; count += 4;
 101               if (n < count+1)
 102                 goto none;
 103               continue;
 104             }
 105             if (s[3] == 'P') {
 106               state = STATE_JISX02132;
 107               s += 4; count += 4;
 108               if (n < count+1)
 109                 goto none;
 110               continue;
 111             }
 112           }
 113           goto ilseq;
 114         }
 115         goto ilseq;
 116       }
 117       break;
 118     }
 119     switch (state) {
 120       case STATE_ASCII:
 121         if (c < 0x80) {
 122           int ret = ascii_mbtowc(conv,pwc,s,1);
 123           if (ret == RET_ILSEQ)
 124             goto ilseq;
 125           if (ret != 1) abort();
 126           conv->istate = state;
 127           return count+1;
 128         } else
 129           goto ilseq;
 130       case STATE_JISX0201ROMAN:
 131         if (c < 0x80) {
 132           int ret = jisx0201_mbtowc(conv,pwc,s,1);
 133           if (ret == RET_ILSEQ)
 134             goto ilseq;
 135           if (ret != 1) abort();
 136           conv->istate = state;
 137           return count+1;
 138         } else
 139           goto ilseq;
 140       case STATE_JISX0201KATAKANA:
 141         if (c < 0x80) {
 142           unsigned char buf = c+0x80;
 143           int ret = jisx0201_mbtowc(conv,pwc,&buf,1);
 144           if (ret == RET_ILSEQ)
 145             goto ilseq;
 146           if (ret != 1) abort();
 147           conv->istate = state;
 148           return count+1;
 149         } else
 150           goto ilseq;
 151       case STATE_JISX0208:
 152         if (n < count+2)
 153           goto none;
 154         if (s[0] < 0x80 && s[1] < 0x80) {
 155           int ret = jisx0208_mbtowc(conv,pwc,s,2);
 156           if (ret == RET_ILSEQ)
 157             goto ilseq;
 158           if (ret != 2) abort();
 159           conv->istate = state;
 160           return count+2;
 161         } else
 162           goto ilseq;
 163       case STATE_JISX02131:
 164       case STATE_JISX02132:
 165         if (n < count+2)
 166           goto none;
 167         if (s[0] < 0x80 && s[1] < 0x80) {
 168           ucs4_t wc = jisx0213_to_ucs4(((state-STATE_JISX02131+1)<<8)+s[0],s[1]);
 169           if (wc) {
 170             if (wc < 0x80) {
 171               /* It's a combining character. */
 172               ucs4_t wc1 = jisx0213_to_ucs_combining[wc - 1][0];
 173               ucs4_t wc2 = jisx0213_to_ucs_combining[wc - 1][1];
 174               /* We cannot output two Unicode characters at once. So,
 175                  output the first character and buffer the second one. */
 176               *pwc = wc1;
 177               conv->istate = (wc2 << 3) | state;
 178             } else {
 179               *pwc = wc;
 180               conv->istate = state;
 181             }
 182             return count+2;
 183           }
 184         }
 185         goto ilseq;
 186       default: abort();
 187     }
 188   none:
 189     conv->istate = state;
 190     return RET_TOOFEW(count);
 191
 192   ilseq:
 193     conv->istate = state;
 194     return RET_SHIFT_ILSEQ(count);
 195   }
 196 }
 197
 198 static int
 199 iso2022_jp3_flushwc (conv_t conv, ucs4_t *pwc)
 200 {
 201   ucs4_t last_wc = conv->istate >> 3;
 202   if (last_wc) {
 203     /* Output the buffered character. */
 204     conv->istate &= 7;
 205     *pwc = last_wc;
 206     return 1;
 207   } else
 208     return 0;
 209 }
 210
 211 /*
 212  * In the UCS-4 to ISO-2022-JP-3 direction, the state also holds the last two
 213  * bytes to be output, shifted by 3 bits, and the STATE_xxxxx value that was
 214  * effective before this buffered character, shifted by 19 bits.
 215  */
 216
 217 /* Composition tables for each of the relevant combining characters.  */
 218 static const struct { unsigned short base; unsigned short composed; } iso2022_jp3_comp_table_data[] = {
 219 #define iso2022_jp3_comp_table02e5_idx 0
 220 #define iso2022_jp3_comp_table02e5_len 1
 221   { 0x2b64, 0x2b65 }, /* 0x12B65 = 0x12B64 U+02E5 */
 222 #define iso2022_jp3_comp_table02e9_idx (iso2022_jp3_comp_table02e5_idx+iso2022_jp3_comp_table02e5_len)
 223 #define iso2022_jp3_comp_table02e9_len 1
 224   { 0x2b60, 0x2b66 }, /* 0x12B66 = 0x12B60 U+02E9 */
 225 #define iso2022_jp3_comp_table0300_idx (iso2022_jp3_comp_table02e9_idx+iso2022_jp3_comp_table02e9_len)
 226 #define iso2022_jp3_comp_table0300_len 5
 227   { 0x295c, 0x2b44 }, /* 0x12B44 = 0x1295C U+0300 */
 228   { 0x2b38, 0x2b48 }, /* 0x12B48 = 0x12B38 U+0300 */
 229   { 0x2b37, 0x2b4a }, /* 0x12B4A = 0x12B37 U+0300 */
 230   { 0x2b30, 0x2b4c }, /* 0x12B4C = 0x12B30 U+0300 */
 231   { 0x2b43, 0x2b4e }, /* 0x12B4E = 0x12B43 U+0300 */
 232 #define iso2022_jp3_comp_table0301_idx (iso2022_jp3_comp_table0300_idx+iso2022_jp3_comp_table0300_len)
 233 #define iso2022_jp3_comp_table0301_len 4
 234   { 0x2b38, 0x2b49 }, /* 0x12B49 = 0x12B38 U+0301 */
 235   { 0x2b37, 0x2b4b }, /* 0x12B4B = 0x12B37 U+0301 */
 236   { 0x2b30, 0x2b4d }, /* 0x12B4D = 0x12B30 U+0301 */
 237   { 0x2b43, 0x2b4f }, /* 0x12B4F = 0x12B43 U+0301 */
 238 #define iso2022_jp3_comp_table309a_idx (iso2022_jp3_comp_table0301_idx+iso2022_jp3_comp_table0301_len)
 239 #define iso2022_jp3_comp_table309a_len 14
 240   { 0x242b, 0x2477 }, /* 0x12477 = 0x1242B U+309A */
 241   { 0x242d, 0x2478 }, /* 0x12478 = 0x1242D U+309A */
 242   { 0x242f, 0x2479 }, /* 0x12479 = 0x1242F U+309A */
 243   { 0x2431, 0x247a }, /* 0x1247A = 0x12431 U+309A */
 244   { 0x2433, 0x247b }, /* 0x1247B = 0x12433 U+309A */
 245   { 0x252b, 0x2577 }, /* 0x12577 = 0x1252B U+309A */
 246   { 0x252d, 0x2578 }, /* 0x12578 = 0x1252D U+309A */
 247   { 0x252f, 0x2579 }, /* 0x12579 = 0x1252F U+309A */
 248   { 0x2531, 0x257a }, /* 0x1257A = 0x12531 U+309A */
 249   { 0x2533, 0x257b }, /* 0x1257B = 0x12533 U+309A */
 250   { 0x253b, 0x257c }, /* 0x1257C = 0x1253B U+309A */
 251   { 0x2544, 0x257d }, /* 0x1257D = 0x12544 U+309A */
 252   { 0x2548, 0x257e }, /* 0x1257E = 0x12548 U+309A */
 253   { 0x2675, 0x2678 }, /* 0x12678 = 0x12675 U+309A */
 254 };
 255
 256 #define SPLIT_STATE \
 257   unsigned short lasttwo = state >> 3; state_t prevstate = state >> 19; state &= 7
 258 #define COMBINE_STATE \
 259   state |= (prevstate << 19) | (lasttwo << 3)
 260 #define COMBINE_STATE_NO_LASTTWO \
 261   /* assume lasttwo == 0, then prevstate is ignored */
 262
 263 static int
 264 iso2022_jp3_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
 265 {
 266   int count = 0;
 267   unsigned char buf[2];
 268   unsigned short jch;
 269   int ret;
 270   state_t state = conv->ostate;
 271   SPLIT_STATE;
 272
 273   if (lasttwo) {
 274     /* Attempt to combine the last character with this one. */
 275     unsigned int idx;
 276     unsigned int len;
 277
 278     if (wc == 0x02e5)
 279       idx = iso2022_jp3_comp_table02e5_idx,
 280       len = iso2022_jp3_comp_table02e5_len;
 281     else if (wc == 0x02e9)
 282       idx = iso2022_jp3_comp_table02e9_idx,
 283       len = iso2022_jp3_comp_table02e9_len;
 284     else if (wc == 0x0300)
 285       idx = iso2022_jp3_comp_table0300_idx,
 286       len = iso2022_jp3_comp_table0300_len;
 287     else if (wc == 0x0301)
 288       idx = iso2022_jp3_comp_table0301_idx,
 289       len = iso2022_jp3_comp_table0301_len;
 290     else if (wc == 0x309a)
 291       idx = iso2022_jp3_comp_table309a_idx,
 292       len = iso2022_jp3_comp_table309a_len;
 293     else
 294       goto not_combining;
 295
 296     do
 297       if (iso2022_jp3_comp_table_data[idx].base == lasttwo)
 298         break;
 299     while (++idx, --len > 0);
 300
 301     if (len > 0) {
 302       /* Output the combined character. */
 303       /* We know the combined character is in JISX0213 plane 1, but
 304          the buffered character may have been in JISX0208 or in
 305          JISX0213 plane 1. */
 306       count = (state != STATE_JISX02131 ? 4 : 0) + 2;
 307       if (n < count)
 308         return RET_TOOSMALL;
 309       if (state != STATE_JISX02131) {
 310         r[0] = ESC;
 311         r[1] = '$';
 312         r[2] = '(';
 313         r[3] = 'Q';
 314         r += 4;
 315         state = STATE_JISX02131;
 316       }
 317       lasttwo = iso2022_jp3_comp_table_data[idx].composed;
 318       r[0] = (lasttwo >> 8) & 0xff;
 319       r[1] = lasttwo & 0xff;
 320       COMBINE_STATE_NO_LASTTWO;
 321       conv->ostate = state;
 322       return count;
 323     }
 324
 325   not_combining:
 326     /* Output the buffered character. */
 327     /* We know it is in JISX0208 or in JISX0213 plane 1. */
 328     count = (prevstate != state ? 3 : 0) + 2;
 329     if (n < count)
 330       return RET_TOOSMALL;
 331     if (prevstate != state) {
 332       if (state != STATE_JISX0208) abort();
 333       r[0] = ESC;
 334       r[1] = '$';
 335       r[2] = 'B';
 336       r += 3;
 337     }
 338     r[0] = (lasttwo >> 8) & 0xff;
 339     r[1] = lasttwo & 0xff;
 340     r += 2;
 341   }
 342
 343   /* Try ASCII. */
 344   ret = ascii_wctomb(conv,buf,wc,1);
 345   if (ret != RET_ILUNI) {
 346     if (ret != 1) abort();
 347     if (buf[0] < 0x80) {
 348       count += (state == STATE_ASCII ? 1 : 4);
 349       if (n < count)
 350         return RET_TOOSMALL;
 351       if (state != STATE_ASCII) {
 352         r[0] = ESC;
 353         r[1] = '(';
 354         r[2] = 'B';
 355         r += 3;
 356         state = STATE_ASCII;
 357       }
 358       r[0] = buf[0];
 359       COMBINE_STATE_NO_LASTTWO;
 360       conv->ostate = state;
 361       return count;
 362     }
 363   }
 364
 365   /* Try JIS X 0201-1976 Roman. */
 366   ret = jisx0201_wctomb(conv,buf,wc,1);
 367   if (ret != RET_ILUNI) {
 368     if (ret != 1) abort();
 369     if (buf[0] < 0x80) {
 370       count += (state == STATE_JISX0201ROMAN ? 1 : 4);
 371       if (n < count)
 372         return RET_TOOSMALL;
 373       if (state != STATE_JISX0201ROMAN) {
 374         r[0] = ESC;
 375         r[1] = '(';
 376         r[2] = 'J';
 377         r += 3;
 378         state = STATE_JISX0201ROMAN;
 379       }
 380       r[0] = buf[0];
 381       COMBINE_STATE_NO_LASTTWO;
 382       conv->ostate = state;
 383       return count;
 384     }
 385   }
 386
 387   jch = ucs4_to_jisx0213(wc);
 388
 389   /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */
 390   ret = jisx0208_wctomb(conv,buf,wc,2);
 391   if (ret != RET_ILUNI) {
 392     if (ret != 2) abort();
 393     if (buf[0] < 0x80 && buf[1] < 0x80) {
 394       if (jch & 0x0080) {
 395         /* A possible match in comp_table_data. Buffer it. */
 396         prevstate = state;
 397         lasttwo = jch & 0x7f7f;
 398         state = STATE_JISX0208;
 399         COMBINE_STATE;
 400         conv->ostate = state;
 401         return count;
 402       } else {
 403         count += (state == STATE_JISX0208 ? 2 : 5);
 404         if (n < count)
 405           return RET_TOOSMALL;
 406         if (state != STATE_JISX0208) {
 407           r[0] = ESC;
 408           r[1] = '$';
 409           r[2] = 'B';
 410           r += 3;
 411           state = STATE_JISX0208;
 412         }
 413         r[0] = buf[0];
 414         r[1] = buf[1];
 415         COMBINE_STATE_NO_LASTTWO;
 416         conv->ostate = state;
 417         return count;
 418       }
 419     }
 420   }
 421
 422   /* Try JISX 0213 plane 1 and JISX 0213 plane 2. */
 423   if (jch != 0) {
 424     if (jch & 0x8000) {
 425       /* JISX 0213 plane 2. */
 426       if (state != STATE_JISX02132) {
 427         count += 4;
 428         if (n < count)
 429           return RET_TOOSMALL;
 430         r[0] = ESC;
 431         r[1] = '$';
 432         r[2] = '(';
 433         r[3] = 'P';
 434         r += 4;
 435         state = STATE_JISX02132;
 436       }
 437     } else {
 438       /* JISX 0213 plane 1. */
 439       if (state != STATE_JISX02131) {
 440         count += 4;
 441         if (n < count)
 442           return RET_TOOSMALL;
 443         r[0] = ESC;
 444         r[1] = '$';
 445         r[2] = '(';
 446         r[3] = 'Q';
 447         r += 4;
 448         state = STATE_JISX02131;
 449       }
 450     }
 451     if (jch & 0x0080) {
 452       /* A possible match in comp_table_data. We have to buffer it. */
 453       /* We know it's a JISX 0213 plane 1 character. */
 454       if (jch & 0x8000) abort();
 455       prevstate = state;
 456       lasttwo = jch & 0x7f7f;
 457       COMBINE_STATE;
 458       conv->ostate = state;
 459       return count;
 460     }
 461     count += 2;
 462     if (n < count)
 463       return RET_TOOSMALL;
 464     r[0] = (jch >> 8) & 0x7f;
 465     r[1] = jch & 0x7f;
 466     COMBINE_STATE_NO_LASTTWO;
 467     conv->ostate = state;
 468     return count;
 469   }
 470
 471   /* Try JIS X 0201-1976 Katakana. This is not officially part of
 472      ISO-2022-JP-3. Therefore we try it after all other attempts. */
 473   ret = jisx0201_wctomb(conv,buf,wc,1);
 474   if (ret != RET_ILUNI) {
 475     if (ret != 1) abort();
 476     if (buf[0] >= 0x80) {
 477       count += (state == STATE_JISX0201KATAKANA ? 1 : 4);
 478       if (n < count)
 479         return RET_TOOSMALL;
 480       if (state != STATE_JISX0201KATAKANA) {
 481         r[0] = ESC;
 482         r[1] = '(';
 483         r[2] = 'I';
 484         r += 3;
 485         state = STATE_JISX0201KATAKANA;
 486       }
 487       r[0] = buf[0]-0x80;
 488       COMBINE_STATE_NO_LASTTWO;
 489       conv->ostate = state;
 490       return count;
 491     }
 492   }
 493
 494   return RET_ILUNI;
 495 }
 496
 497 static int
 498 iso2022_jp3_reset (conv_t conv, unsigned char *r, int n)
 499 {
 500   state_t state = conv->ostate;
 501   SPLIT_STATE;
 502   {
 503     int count =
 504       (lasttwo ? (prevstate != state ? 3 : 0) + 2 : 0)
 505       + (state != STATE_ASCII ? 3 : 0);
 506     if (n < count)
 507       return RET_TOOSMALL;
 508     if (lasttwo) {
 509       if (prevstate != state) {
 510         if (state != STATE_JISX0208) abort();
 511         r[0] = ESC;
 512         r[1] = '$';
 513         r[2] = 'B';
 514         r += 3;
 515       }
 516       r[0] = (lasttwo >> 8) & 0xff;
 517       r[1] = lasttwo & 0xff;
 518       r += 2;
 519     }
 520     if (state != STATE_ASCII) {
 521       r[0] = ESC;
 522       r[1] = '(';
 523       r[2] = 'B';
 524     }
 525     /* conv->ostate = 0; will be done by the caller */
 526     return count;
 527   }
 528 }
 529
 530 #undef COMBINE_STATE_NO_LASTTWO
 531 #undef COMBINE_STATE
 532 #undef SPLIT_STATE
 533 #undef STATE_JISX02132
 534 #undef STATE_JISX02131
 535 #undef STATE_JISX0208
 536 #undef STATE_JISX0201KATAKANA
 537 #undef STATE_JISX0201ROMAN
 538 #undef STATE_ASCII