Annotation of embedaddon/libiconv/lib/iso2022_jpms.h, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 1999-2001, 2008, 2011-2012, 2016, 2018 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, see <https://www.gnu.org/licenses/>.
! 18: */
! 19:
! 20: /*
! 21: * ISO-2022-JP-MS
! 22: * alias CP50221
! 23: *
! 24: * This is an extension of ISO-2022-JP-1 with larger character sets.
! 25: * It uses ESC $ B and ESC $ ( D to denote *extensions* of JIS X 0208 and
! 26: * JIS X 0212, respectively. This violates the principles of ISO 2022,
! 27: * where
! 28: * 1. character sets to be used by ISO 2022 have to be registered at the
! 29: * ISO IR registry <https://www.itscj.ipsj.or.jp/ISO-IR/>,
! 30: * 2. different character sets are designated by different escape
! 31: * sequences.
! 32: * It's a typical instance of the "embrace and extend" strategy by Microsoft
! 33: * <https://en.wikipedia.org/wiki/Embrace,_extend_and_extinguish>.
! 34: */
! 35:
! 36: /*
! 37: * Windows has three encodings CP50220, CP50221, CP50222.
! 38: * The common parts are:
! 39: * - US-ASCII (0x00..0x7F)
! 40: * - JIS X 0208 extended by
! 41: * - one row (0x2D),
! 42: * - a private use area (rows 0x75..0x7E = U+E000..U+E3AB),
! 43: * enabled with ESC $ B, disabled with ESC ( B.
! 44: * - JIS X 0212 extended by
! 45: * - two rows (0x73..0x74),
! 46: * - a private use area (rows 0x75..0x7E = U+E3AC..U+E757),
! 47: * enabled with ESC $ ( D, disabled with ESC ( B.
! 48: * They differ in the handling of JIS X 0201 characters (halfwidth Katakana)
! 49: * in the conversion direction Unicode -> CP5022x:
! 50: * * CP50220 maps the halfwidth Katakana to fullwidth Katakana characters.
! 51: * * CP50221 contains the JIS X 0201 halfwidth Katakana characters,
! 52: * enabled with ESC ( I, disabled with ESC ( B.
! 53: * * CP50222 contains the JIS X 0201 halfwidth Katakana characters,
! 54: * enabled with ESC ( J 0x0E, disabled with ESC ( B.
! 55: * In the conversion direction CP5022x -> Unicode, all three operate the same:
! 56: * - ESC ( I is supported and understood.
! 57: * - ESC ( J 0x0E is not accepted. (Tested on Windows XP SP3.)
! 58: * Conclusion:
! 59: * - CP50222 should not be used, because the multibyte sequence that it
! 60: * produces cannot be parsed by either of the three encodings.
! 61: * - CP50221 is preferrable to CP50220, because it can faithfully represent
! 62: * the halfwidth Katakana characters.
! 63: * We therefore implement CP50221. As an extension, in the mbtowc conversion
! 64: * direction, we support also ESC ( J 0x0E, just in case.
! 65: */
! 66:
! 67: #include "cp50221_0208_ext.h"
! 68: #include "cp50221_0212_ext.h"
! 69:
! 70: #define ESC 0x1b
! 71: #define SO 0x0e
! 72: #define SI 0x0f
! 73:
! 74: /*
! 75: * The state can be one of the following values.
! 76: */
! 77: #define STATE_ASCII 0 /* Esc ( B */
! 78: #define STATE_JISX0201ROMAN 1 /* Esc ( J */ /* only in mbtowc direction */
! 79: #define STATE_JISX0201KATAKANA 2 /* Esc ( I */
! 80: #define STATE_JISX0208MS 3 /* Esc $ @ or Esc $ B */
! 81: #define STATE_JISX0212MS 4 /* Esc $ ( D */
! 82:
! 83: static int
! 84: iso2022_jpms_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
! 85: {
! 86: state_t state = conv->istate;
! 87: int count = 0;
! 88: unsigned char c;
! 89: for (;;) {
! 90: c = *s;
! 91: if (c == ESC) {
! 92: if (n < count+3)
! 93: goto none;
! 94: if (s[1] == '(') {
! 95: if (s[2] == 'B') {
! 96: state = STATE_ASCII;
! 97: s += 3; count += 3;
! 98: if (n < count+1)
! 99: goto none;
! 100: continue;
! 101: }
! 102: if (s[2] == 'I') {
! 103: state = STATE_JISX0201KATAKANA;
! 104: s += 3; count += 3;
! 105: if (n < count+1)
! 106: goto none;
! 107: continue;
! 108: }
! 109: if (s[2] == 'J') {
! 110: state = STATE_JISX0201ROMAN;
! 111: s += 3; count += 3;
! 112: if (n < count+1)
! 113: goto none;
! 114: continue;
! 115: }
! 116: goto ilseq;
! 117: }
! 118: if (s[1] == '$') {
! 119: if (s[2] == '@' || s[2] == 'B') {
! 120: /* We don't distinguish JIS X 0208-1978 and JIS X 0208-1983. */
! 121: state = STATE_JISX0208MS;
! 122: s += 3; count += 3;
! 123: if (n < count+1)
! 124: goto none;
! 125: continue;
! 126: }
! 127: if (s[2] == '(') {
! 128: if (n < count+4)
! 129: goto none;
! 130: if (s[3] == 'D') {
! 131: state = STATE_JISX0212MS;
! 132: s += 4; count += 4;
! 133: if (n < count+1)
! 134: goto none;
! 135: continue;
! 136: }
! 137: }
! 138: goto ilseq;
! 139: }
! 140: goto ilseq;
! 141: }
! 142: if (c == SO) {
! 143: if (state == STATE_JISX0201ROMAN)
! 144: state = STATE_JISX0201KATAKANA;
! 145: s += 1; count += 1;
! 146: if (n < count+1)
! 147: goto none;
! 148: continue;
! 149: }
! 150: if (c == SI) {
! 151: if (state == STATE_JISX0201KATAKANA)
! 152: state = STATE_JISX0201ROMAN;
! 153: s += 1; count += 1;
! 154: if (n < count+1)
! 155: goto none;
! 156: continue;
! 157: }
! 158: break;
! 159: }
! 160: switch (state) {
! 161: case STATE_ASCII:
! 162: if (c < 0x80) {
! 163: int ret = ascii_mbtowc(conv,pwc,s,1);
! 164: if (ret == RET_ILSEQ)
! 165: goto ilseq;
! 166: if (ret != 1) abort();
! 167: conv->istate = state;
! 168: return count+1;
! 169: } else
! 170: goto ilseq;
! 171: case STATE_JISX0201ROMAN:
! 172: if (c < 0x80) {
! 173: int ret = jisx0201_mbtowc(conv,pwc,s,1);
! 174: if (ret == RET_ILSEQ)
! 175: goto ilseq;
! 176: if (ret != 1) abort();
! 177: conv->istate = state;
! 178: return count+1;
! 179: } else
! 180: goto ilseq;
! 181: case STATE_JISX0201KATAKANA:
! 182: if (c < 0x80) {
! 183: unsigned char buf = c+0x80;
! 184: int ret = jisx0201_mbtowc(conv,pwc,&buf,1);
! 185: if (ret == RET_ILSEQ)
! 186: goto ilseq;
! 187: if (ret != 1) abort();
! 188: conv->istate = state;
! 189: return count+1;
! 190: } else
! 191: goto ilseq;
! 192: case STATE_JISX0208MS:
! 193: if (n < count+2)
! 194: goto none;
! 195: if (s[0] < 0x80 && s[1] < 0x80) {
! 196: int ret;
! 197: if (s[0] < 0x75) {
! 198: if (s[0] == 0x2d) {
! 199: /* Extension of JIS X 0208. */
! 200: if (s[1] >= 0x21 && s[1] <= 0x79) {
! 201: unsigned char i = (s[1] - 0x21) + 1;
! 202: ret = cp50221_0208_ext_mbtowc(conv,pwc,&i,1);
! 203: if (ret == 1)
! 204: ret = 2;
! 205: } else
! 206: ret = RET_ILSEQ;
! 207: } else {
! 208: /* JIS X 0208. */
! 209: ret = jisx0208_mbtowc(conv,pwc,s,2);
! 210: }
! 211: } else {
! 212: /* Extension of JIS X 0208.
! 213: 0x{75..7E}{21..8E} maps to U+E000..U+E3AB.
! 214: But some rows maps to characters present in CP932. */
! 215: if (s[0] <= 0x7e && (s[1] >= 0x21 && s[1] <= 0x7e)) {
! 216: unsigned short wc = 0xfffd;
! 217: if (s[0] >= 0x79 && s[0] <= 0x7c)
! 218: wc = cp932ext_2uni_pageed[(s[0] - 0x79) * 94 + (s[1] - 0x21)];
! 219: if (wc == 0xfffd)
! 220: wc = (s[0] - 0x75) * 94 + (s[1] - 0x21) + 0xe000;
! 221: *pwc = wc;
! 222: ret = 2;
! 223: } else
! 224: ret = RET_ILSEQ;
! 225: }
! 226: if (ret == RET_ILSEQ)
! 227: goto ilseq;
! 228: if (ret != 2) abort();
! 229: conv->istate = state;
! 230: return count+2;
! 231: } else
! 232: goto ilseq;
! 233: case STATE_JISX0212MS:
! 234: if (n < count+2)
! 235: goto none;
! 236: if (s[0] < 0x80 && s[1] < 0x80) {
! 237: int ret;
! 238: if (s[0] < 0x73) {
! 239: /* JIS X 0212. */
! 240: ret = jisx0212_mbtowc(conv,pwc,s,2);
! 241: } else {
! 242: if (s[0] < 0x75) {
! 243: /* Extension of JIS X 0212. */
! 244: if (s[1] >= 0x21 && s[1] <= 0x7e) {
! 245: unsigned char i = (s[0] - 0x73) * 94 + (s[1] - 0x21) + 1;
! 246: ret = cp50221_0212_ext_mbtowc(conv,pwc,&i,1);
! 247: if (ret == 1)
! 248: ret = 2;
! 249: } else
! 250: ret = RET_ILSEQ;
! 251: } else {
! 252: /* Extension of JIS X 0208.
! 253: 0x{75..7E}{21..8E} maps to U+E3AC..U+E757. */
! 254: if (s[0] <= 0x7e && (s[1] >= 0x21 && s[1] <= 0x7e)) {
! 255: *pwc = (s[0] - 0x75) * 94 + (s[1] - 0x21) + 0xe3ac;
! 256: ret = 2;
! 257: } else
! 258: ret = RET_ILSEQ;
! 259: }
! 260: }
! 261: if (ret == RET_ILSEQ)
! 262: goto ilseq;
! 263: if (ret != 2) abort();
! 264: conv->istate = state;
! 265: return count+2;
! 266: } else
! 267: goto ilseq;
! 268: default: abort();
! 269: }
! 270:
! 271: none:
! 272: conv->istate = state;
! 273: return RET_TOOFEW(count);
! 274:
! 275: ilseq:
! 276: conv->istate = state;
! 277: return RET_SHIFT_ILSEQ(count);
! 278: }
! 279:
! 280: static int
! 281: iso2022_jpms_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
! 282: {
! 283: state_t state = conv->ostate;
! 284: unsigned char buf[2];
! 285: int ret;
! 286:
! 287: /* Try ASCII. */
! 288: ret = ascii_wctomb(conv,buf,wc,1);
! 289: if (ret != RET_ILUNI) {
! 290: if (ret != 1) abort();
! 291: if (buf[0] < 0x80) {
! 292: int count = (state == STATE_ASCII ? 1 : 4);
! 293: if (n < count)
! 294: return RET_TOOSMALL;
! 295: if (state != STATE_ASCII) {
! 296: r[0] = ESC;
! 297: r[1] = '(';
! 298: r[2] = 'B';
! 299: r += 3;
! 300: state = STATE_ASCII;
! 301: }
! 302: r[0] = buf[0];
! 303: conv->ostate = state;
! 304: return count;
! 305: }
! 306: }
! 307:
! 308: /* Try JIS X 0201-1976 Katakana. */
! 309: ret = jisx0201_wctomb(conv,buf,wc,1);
! 310: if (ret != RET_ILUNI) {
! 311: if (ret != 1) abort();
! 312: if (buf[0] >= 0x80) {
! 313: int count = (state == STATE_JISX0201KATAKANA ? 1 : 4);
! 314: if (n < count)
! 315: return RET_TOOSMALL;
! 316: if (state != STATE_JISX0201KATAKANA) {
! 317: r[0] = ESC;
! 318: r[1] = '(';
! 319: r[2] = 'I';
! 320: r += 3;
! 321: state = STATE_JISX0201KATAKANA;
! 322: }
! 323: r[0] = buf[0]-0x80;
! 324: conv->ostate = state;
! 325: return count;
! 326: }
! 327: }
! 328:
! 329: /* Try JIS X 0208-1990, in place of JIS X 0208-1978 and JIS X 0208-1983,
! 330: and the extensions mentioned above. */
! 331: if (wc >= 0xe000 && wc < 0xe3ac) {
! 332: unsigned short i = wc - 0xe000;
! 333: buf[0] = (i / 94) + 0x75;
! 334: buf[1] = (i % 94) + 0x21;
! 335: ret = 2;
! 336: } else {
! 337: ret = jisx0208_wctomb(conv,buf,wc,2);
! 338: if (ret == RET_ILUNI) {
! 339: /* Extension of JIS X 0208. */
! 340: unsigned char i;
! 341: ret = cp50221_0208_ext_wctomb(conv,&i,wc,1);
! 342: if (ret == 1) {
! 343: buf[0] = 0x2d;
! 344: buf[1] = i-1 + 0x21;
! 345: ret = 2;
! 346: } else if (wc == 0x663B) {
! 347: buf[0] = 0x7a;
! 348: buf[1] = 0x36;
! 349: ret = 2;
! 350: } else if (wc == 0xffe2) {
! 351: buf[0] = 0x7c;
! 352: buf[1] = 0x7b;
! 353: ret = 2;
! 354: } else if (wc == 0xffe4) {
! 355: buf[0] = 0x7c;
! 356: buf[1] = 0x7c;
! 357: ret = 2;
! 358: }
! 359: }
! 360: }
! 361: if (ret != RET_ILUNI) {
! 362: if (ret != 2) abort();
! 363: if (buf[0] < 0x80 && buf[1] < 0x80) {
! 364: int count = (state == STATE_JISX0208MS ? 2 : 5);
! 365: if (n < count)
! 366: return RET_TOOSMALL;
! 367: if (state != STATE_JISX0208MS) {
! 368: r[0] = ESC;
! 369: r[1] = '$';
! 370: r[2] = 'B';
! 371: r += 3;
! 372: state = STATE_JISX0208MS;
! 373: }
! 374: r[0] = buf[0];
! 375: r[1] = buf[1];
! 376: conv->ostate = state;
! 377: return count;
! 378: }
! 379: }
! 380:
! 381: /* Try JIS X 0212-1990 and the extensions mentioned above. */
! 382: if (wc >= 0xe3ac && wc < 0xe758) {
! 383: unsigned short i = wc - 0xe3ac;
! 384: buf[0] = (i / 94) + 0x75;
! 385: buf[1] = (i % 94) + 0x21;
! 386: ret = 2;
! 387: } else {
! 388: ret = jisx0212_wctomb(conv,buf,wc,2);
! 389: if (ret == RET_ILUNI) {
! 390: /* Extension of JIS X 0212. */
! 391: unsigned char i;
! 392: ret = cp50221_0212_ext_wctomb(conv,&i,wc,1);
! 393: if (ret == 1) {
! 394: i -= 1;
! 395: buf[0] = (i / 94) + 0x73;
! 396: buf[1] = (i % 94) + 0x21;
! 397: ret = 2;
! 398: }
! 399: }
! 400: }
! 401: if (ret != RET_ILUNI) {
! 402: if (ret != 2) abort();
! 403: if (buf[0] < 0x80 && buf[1] < 0x80) {
! 404: int count = (state == STATE_JISX0212MS ? 2 : 6);
! 405: if (n < count)
! 406: return RET_TOOSMALL;
! 407: if (state != STATE_JISX0212MS) {
! 408: r[0] = ESC;
! 409: r[1] = '$';
! 410: r[2] = '(';
! 411: r[3] = 'D';
! 412: r += 4;
! 413: state = STATE_JISX0212MS;
! 414: }
! 415: r[0] = buf[0];
! 416: r[1] = buf[1];
! 417: conv->ostate = state;
! 418: return count;
! 419: }
! 420: }
! 421:
! 422: return RET_ILUNI;
! 423: }
! 424:
! 425: static int
! 426: iso2022_jpms_reset (conv_t conv, unsigned char *r, size_t n)
! 427: {
! 428: state_t state = conv->ostate;
! 429: if (state != STATE_ASCII) {
! 430: if (n < 3)
! 431: return RET_TOOSMALL;
! 432: r[0] = ESC;
! 433: r[1] = '(';
! 434: r[2] = 'B';
! 435: /* conv->ostate = 0; will be done by the caller */
! 436: return 3;
! 437: } else
! 438: return 0;
! 439: }
! 440:
! 441: #undef STATE_JISX0212MS
! 442: #undef STATE_JISX0208MS
! 443: #undef STATE_JISX0201KATAKANA
! 444: #undef STATE_JISX0201ROMAN
! 445: #undef STATE_ASCII
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