1/* 2 * Copyright (C) 1999-2004 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 44static int 45iso2022_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 return RET_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 return RET_ILSEQ; 114 } 115 return RET_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 return RET_ILSEQ; 125 if (ret != 1) abort(); 126 conv->istate = state; 127 return count+1; 128 } else 129 return RET_ILSEQ; 130 case STATE_JISX0201ROMAN: 131 if (c < 0x80) { 132 int ret = jisx0201_mbtowc(conv,pwc,s,1); 133 if (ret == RET_ILSEQ) 134 return RET_ILSEQ; 135 if (ret != 1) abort(); 136 conv->istate = state; 137 return count+1; 138 } else 139 return RET_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 return RET_ILSEQ; 146 if (ret != 1) abort(); 147 conv->istate = state; 148 return count+1; 149 } else 150 return RET_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 return RET_ILSEQ; 158 if (ret != 2) abort(); 159 conv->istate = state; 160 return count+2; 161 } else 162 return RET_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 return RET_ILSEQ; 186 default: abort(); 187 } 188 none: 189 conv->istate = state; 190 return RET_TOOFEW(count); 191 } 192} 193 194static int 195iso2022_jp3_flushwc (conv_t conv, ucs4_t *pwc) 196{ 197 ucs4_t last_wc = conv->istate >> 3; 198 if (last_wc) { 199 /* Output the buffered character. */ 200 conv->istate &= 7; 201 *pwc = last_wc; 202 return 1; 203 } else 204 return 0; 205} 206 207/* 208 * In the UCS-4 to ISO-2022-JP-3 direction, the state also holds the last two 209 * bytes to be output, shifted by 3 bits, and the STATE_xxxxx value that was 210 * effective before this buffered character, shifted by 19 bits. 211 */ 212 213/* Composition tables for each of the relevant combining characters. */ 214static const struct { unsigned short base; unsigned short composed; } iso2022_jp3_comp_table_data[] = { 215#define iso2022_jp3_comp_table02e5_idx 0 216#define iso2022_jp3_comp_table02e5_len 1 217 { 0x2b64, 0x2b65 }, /* 0x12B65 = 0x12B64 U+02E5 */ 218#define iso2022_jp3_comp_table02e9_idx (iso2022_jp3_comp_table02e5_idx+iso2022_jp3_comp_table02e5_len) 219#define iso2022_jp3_comp_table02e9_len 1 220 { 0x2b60, 0x2b66 }, /* 0x12B66 = 0x12B60 U+02E9 */ 221#define iso2022_jp3_comp_table0300_idx (iso2022_jp3_comp_table02e9_idx+iso2022_jp3_comp_table02e9_len) 222#define iso2022_jp3_comp_table0300_len 5 223 { 0x295c, 0x2b44 }, /* 0x12B44 = 0x1295C U+0300 */ 224 { 0x2b38, 0x2b48 }, /* 0x12B48 = 0x12B38 U+0300 */ 225 { 0x2b37, 0x2b4a }, /* 0x12B4A = 0x12B37 U+0300 */ 226 { 0x2b30, 0x2b4c }, /* 0x12B4C = 0x12B30 U+0300 */ 227 { 0x2b43, 0x2b4e }, /* 0x12B4E = 0x12B43 U+0300 */ 228#define iso2022_jp3_comp_table0301_idx (iso2022_jp3_comp_table0300_idx+iso2022_jp3_comp_table0300_len) 229#define iso2022_jp3_comp_table0301_len 4 230 { 0x2b38, 0x2b49 }, /* 0x12B49 = 0x12B38 U+0301 */ 231 { 0x2b37, 0x2b4b }, /* 0x12B4B = 0x12B37 U+0301 */ 232 { 0x2b30, 0x2b4d }, /* 0x12B4D = 0x12B30 U+0301 */ 233 { 0x2b43, 0x2b4f }, /* 0x12B4F = 0x12B43 U+0301 */ 234#define iso2022_jp3_comp_table309a_idx (iso2022_jp3_comp_table0301_idx+iso2022_jp3_comp_table0301_len) 235#define iso2022_jp3_comp_table309a_len 14 236 { 0x242b, 0x2477 }, /* 0x12477 = 0x1242B U+309A */ 237 { 0x242d, 0x2478 }, /* 0x12478 = 0x1242D U+309A */ 238 { 0x242f, 0x2479 }, /* 0x12479 = 0x1242F U+309A */ 239 { 0x2431, 0x247a }, /* 0x1247A = 0x12431 U+309A */ 240 { 0x2433, 0x247b }, /* 0x1247B = 0x12433 U+309A */ 241 { 0x252b, 0x2577 }, /* 0x12577 = 0x1252B U+309A */ 242 { 0x252d, 0x2578 }, /* 0x12578 = 0x1252D U+309A */ 243 { 0x252f, 0x2579 }, /* 0x12579 = 0x1252F U+309A */ 244 { 0x2531, 0x257a }, /* 0x1257A = 0x12531 U+309A */ 245 { 0x2533, 0x257b }, /* 0x1257B = 0x12533 U+309A */ 246 { 0x253b, 0x257c }, /* 0x1257C = 0x1253B U+309A */ 247 { 0x2544, 0x257d }, /* 0x1257D = 0x12544 U+309A */ 248 { 0x2548, 0x257e }, /* 0x1257E = 0x12548 U+309A */ 249 { 0x2675, 0x2678 }, /* 0x12678 = 0x12675 U+309A */ 250}; 251 252#define SPLIT_STATE \ 253 unsigned short lasttwo = state >> 3; state_t prevstate = state >> 19; state &= 7 254#define COMBINE_STATE \ 255 state |= (prevstate << 19) | (lasttwo << 3) 256#define COMBINE_STATE_NO_LASTTWO \ 257 /* assume lasttwo == 0, then prevstate is ignored */ 258 259static int 260iso2022_jp3_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) 261{ 262 int count = 0; 263 unsigned char buf[2]; 264 unsigned short jch; 265 int ret; 266 state_t state = conv->ostate; 267 SPLIT_STATE; 268 269 if (lasttwo) { 270 /* Attempt to combine the last character with this one. */ 271 unsigned int idx; 272 unsigned int len; 273 274 if (wc == 0x02e5) 275 idx = iso2022_jp3_comp_table02e5_idx, 276 len = iso2022_jp3_comp_table02e5_len; 277 else if (wc == 0x02e9) 278 idx = iso2022_jp3_comp_table02e9_idx, 279 len = iso2022_jp3_comp_table02e9_len; 280 else if (wc == 0x0300) 281 idx = iso2022_jp3_comp_table0300_idx, 282 len = iso2022_jp3_comp_table0300_len; 283 else if (wc == 0x0301) 284 idx = iso2022_jp3_comp_table0301_idx, 285 len = iso2022_jp3_comp_table0301_len; 286 else if (wc == 0x309a) 287 idx = iso2022_jp3_comp_table309a_idx, 288 len = iso2022_jp3_comp_table309a_len; 289 else 290 goto not_combining; 291 292 do 293 if (iso2022_jp3_comp_table_data[idx].base == lasttwo) 294 break; 295 while (++idx, --len > 0); 296 297 if (len > 0) { 298 /* Output the combined character. */ 299 /* We know the combined character is in JISX0213 plane 1, but 300 the buffered character may have been in JISX0208 or in 301 JISX0213 plane 1. */ 302 count = (state != STATE_JISX02131 ? 4 : 0) + 2; 303 if (n < count) 304 return RET_TOOSMALL; 305 if (state != STATE_JISX02131) { 306 r[0] = ESC; 307 r[1] = '$'; 308 r[2] = '('; 309 r[3] = 'Q'; 310 r += 4; 311 state = STATE_JISX02131; 312 } 313 lasttwo = iso2022_jp3_comp_table_data[idx].composed; 314 r[0] = (lasttwo >> 8) & 0xff; 315 r[1] = lasttwo & 0xff; 316 COMBINE_STATE_NO_LASTTWO; 317 conv->ostate = state; 318 return count; 319 } 320 321 not_combining: 322 /* Output the buffered character. */ 323 /* We know it is in JISX0208 or in JISX0213 plane 1. */ 324 count = (prevstate != state ? 3 : 0) + 2; 325 if (n < count) 326 return RET_TOOSMALL; 327 if (prevstate != state) { 328 if (state != STATE_JISX0208) abort(); 329 r[0] = ESC; 330 r[1] = '$'; 331 r[2] = 'B'; 332 r += 3; 333 } 334 r[0] = (lasttwo >> 8) & 0xff; 335 r[1] = lasttwo & 0xff; 336 r += 2; 337 } 338 339 /* Try ASCII. */ 340 ret = ascii_wctomb(conv,buf,wc,1); 341 if (ret != RET_ILUNI) { 342 if (ret != 1) abort(); 343 if (buf[0] < 0x80) { 344 count += (state == STATE_ASCII ? 1 : 4); 345 if (n < count) 346 return RET_TOOSMALL; 347 if (state != STATE_ASCII) { 348 r[0] = ESC; 349 r[1] = '('; 350 r[2] = 'B'; 351 r += 3; 352 state = STATE_ASCII; 353 } 354 r[0] = buf[0]; 355 COMBINE_STATE_NO_LASTTWO; 356 conv->ostate = state; 357 return count; 358 } 359 } 360 361 /* Try JIS X 0201-1976 Roman. */ 362 ret = jisx0201_wctomb(conv,buf,wc,1); 363 if (ret != RET_ILUNI) { 364 if (ret != 1) abort(); 365 if (buf[0] < 0x80) { 366 count += (state == STATE_JISX0201ROMAN ? 1 : 4); 367 if (n < count) 368 return RET_TOOSMALL; 369 if (state != STATE_JISX0201ROMAN) { 370 r[0] = ESC; 371 r[1] = '('; 372 r[2] = 'J'; 373 r += 3; 374 state = STATE_JISX0201ROMAN; 375 } 376 r[0] = buf[0]; 377 COMBINE_STATE_NO_LASTTWO; 378 conv->ostate = state; 379 return count; 380 } 381 } 382 383 jch = ucs4_to_jisx0213(wc); 384 385 /* Try JIS X 0208-1990 in place of JIS X 0208-1978 and JIS X 0208-1983. */ 386 ret = jisx0208_wctomb(conv,buf,wc,2); 387 if (ret != RET_ILUNI) { 388 if (ret != 2) abort(); 389 if (buf[0] < 0x80 && buf[1] < 0x80) { 390 if (jch & 0x0080) { 391 /* A possible match in comp_table_data. Buffer it. */ 392 prevstate = state; 393 lasttwo = jch & 0x7f7f; 394 state = STATE_JISX0208; 395 COMBINE_STATE; 396 conv->ostate = state; 397 return count; 398 } else { 399 count += (state == STATE_JISX0208 ? 2 : 5); 400 if (n < count) 401 return RET_TOOSMALL; 402 if (state != STATE_JISX0208) { 403 r[0] = ESC; 404 r[1] = '$'; 405 r[2] = 'B'; 406 r += 3; 407 state = STATE_JISX0208; 408 } 409 r[0] = buf[0]; 410 r[1] = buf[1]; 411 COMBINE_STATE_NO_LASTTWO; 412 conv->ostate = state; 413 return count; 414 } 415 } 416 } 417 418 /* Try JISX 0213 plane 1 and JISX 0213 plane 2. */ 419 if (jch != 0) { 420 if (jch & 0x8000) { 421 /* JISX 0213 plane 2. */ 422 if (state != STATE_JISX02132) { 423 count += 4; 424 if (n < count) 425 return RET_TOOSMALL; 426 r[0] = ESC; 427 r[1] = '$'; 428 r[2] = '('; 429 r[3] = 'P'; 430 r += 4; 431 state = STATE_JISX02132; 432 } 433 } else { 434 /* JISX 0213 plane 1. */ 435 if (state != STATE_JISX02131) { 436 count += 4; 437 if (n < count) 438 return RET_TOOSMALL; 439 r[0] = ESC; 440 r[1] = '$'; 441 r[2] = '('; 442 r[3] = 'Q'; 443 r += 4; 444 state = STATE_JISX02131; 445 } 446 } 447 if (jch & 0x0080) { 448 /* A possible match in comp_table_data. We have to buffer it. */ 449 /* We know it's a JISX 0213 plane 1 character. */ 450 if (jch & 0x8000) abort(); 451 prevstate = state; 452 lasttwo = jch & 0x7f7f; 453 COMBINE_STATE; 454 conv->ostate = state; 455 return count; 456 } 457 count += 2; 458 if (n < count) 459 return RET_TOOSMALL; 460 r[0] = (jch >> 8) & 0x7f; 461 r[1] = jch & 0x7f; 462 COMBINE_STATE_NO_LASTTWO; 463 conv->ostate = state; 464 return count; 465 } 466 467 /* Try JIS X 0201-1976 Katakana. This is not officially part of 468 ISO-2022-JP-3. Therefore we try it after all other attempts. */ 469 ret = jisx0201_wctomb(conv,buf,wc,1); 470 if (ret != RET_ILUNI) { 471 if (ret != 1) abort(); 472 if (buf[0] >= 0x80) { 473 count += (state == STATE_JISX0201KATAKANA ? 1 : 4); 474 if (n < count) 475 return RET_TOOSMALL; 476 if (state != STATE_JISX0201KATAKANA) { 477 r[0] = ESC; 478 r[1] = '('; 479 r[2] = 'I'; 480 r += 3; 481 state = STATE_JISX0201KATAKANA; 482 } 483 r[0] = buf[0]-0x80; 484 COMBINE_STATE_NO_LASTTWO; 485 conv->ostate = state; 486 return count; 487 } 488 } 489 490 return RET_ILUNI; 491} 492 493static int 494iso2022_jp3_reset (conv_t conv, unsigned char *r, int n) 495{ 496 state_t state = conv->ostate; 497 SPLIT_STATE; 498 { 499 int count = 500 (lasttwo ? (prevstate != state ? 3 : 0) + 2 : 0) 501 + (state != STATE_ASCII ? 3 : 0); 502 if (n < count) 503 return RET_TOOSMALL; 504 if (lasttwo) { 505 if (prevstate != state) { 506 if (state != STATE_JISX0208) abort(); 507 r[0] = ESC; 508 r[1] = '$'; 509 r[2] = 'B'; 510 r += 3; 511 } 512 r[0] = (lasttwo >> 8) & 0xff; 513 r[1] = lasttwo & 0xff; 514 r += 2; 515 } 516 if (state != STATE_ASCII) { 517 r[0] = ESC; 518 r[1] = '('; 519 r[2] = 'B'; 520 } 521 /* conv->ostate = 0; will be done by the caller */ 522 return count; 523 } 524} 525 526#undef COMBINE_STATE_NO_LASTTWO 527#undef COMBINE_STATE 528#undef SPLIT_STATE 529#undef STATE_JISX02132 530#undef STATE_JISX02131 531#undef STATE_JISX0208 532#undef STATE_JISX0201KATAKANA 533#undef STATE_JISX0201ROMAN 534#undef STATE_ASCII 535