Annotation of embedaddon/libiconv/lib/iso2022_cn.h, revision 1.1
1.1 ! misho 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
! 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: /*
! 43: * and one of the following values, << 16
! 44: */
! 45: #define STATE3_NONE 0
! 46: #define STATE3_DESIGNATED_CNS11643_2 1
! 47:
! 48: #define SPLIT_STATE \
! 49: unsigned int state1 = state & 0xff, state2 = (state >> 8) & 0xff, state3 = state >> 16
! 50: #define COMBINE_STATE \
! 51: state = (state3 << 16) | (state2 << 8) | state1
! 52:
! 53: static int
! 54: iso2022_cn_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
! 55: {
! 56: state_t state = conv->istate;
! 57: SPLIT_STATE;
! 58: int count = 0;
! 59: unsigned char c;
! 60: for (;;) {
! 61: c = *s;
! 62: if (c == ESC) {
! 63: if (n < count+4)
! 64: goto none;
! 65: if (s[1] == '$') {
! 66: if (s[2] == ')') {
! 67: if (s[3] == 'A') {
! 68: state2 = STATE2_DESIGNATED_GB2312;
! 69: s += 4; count += 4;
! 70: if (n < count+1)
! 71: goto none;
! 72: continue;
! 73: }
! 74: if (s[3] == 'G') {
! 75: state2 = STATE2_DESIGNATED_CNS11643_1;
! 76: s += 4; count += 4;
! 77: if (n < count+1)
! 78: goto none;
! 79: continue;
! 80: }
! 81: }
! 82: if (s[2] == '*') {
! 83: if (s[3] == 'H') {
! 84: state3 = STATE3_DESIGNATED_CNS11643_2;
! 85: s += 4; count += 4;
! 86: if (n < count+1)
! 87: goto none;
! 88: continue;
! 89: }
! 90: }
! 91: }
! 92: if (s[1] == 'N') {
! 93: switch (state3) {
! 94: case STATE3_NONE:
! 95: goto ilseq;
! 96: case STATE3_DESIGNATED_CNS11643_2:
! 97: if (s[2] < 0x80 && s[3] < 0x80) {
! 98: int ret = cns11643_2_mbtowc(conv,pwc,s+2,2);
! 99: if (ret == RET_ILSEQ)
! 100: goto ilseq;
! 101: if (ret != 2) abort();
! 102: COMBINE_STATE;
! 103: conv->istate = state;
! 104: return count+4;
! 105: } else
! 106: goto ilseq;
! 107: default: abort();
! 108: }
! 109: }
! 110: goto ilseq;
! 111: }
! 112: if (c == SO) {
! 113: if (state2 != STATE2_DESIGNATED_GB2312 && state2 != STATE2_DESIGNATED_CNS11643_1)
! 114: goto ilseq;
! 115: state1 = STATE_TWOBYTE;
! 116: s++; count++;
! 117: if (n < count+1)
! 118: goto none;
! 119: continue;
! 120: }
! 121: if (c == SI) {
! 122: state1 = STATE_ASCII;
! 123: s++; count++;
! 124: if (n < count+1)
! 125: goto none;
! 126: continue;
! 127: }
! 128: break;
! 129: }
! 130: switch (state1) {
! 131: case STATE_ASCII:
! 132: if (c < 0x80) {
! 133: int ret = ascii_mbtowc(conv,pwc,s,1);
! 134: if (ret == RET_ILSEQ)
! 135: goto ilseq;
! 136: if (ret != 1) abort();
! 137: if (*pwc == 0x000a || *pwc == 0x000d) {
! 138: state2 = STATE2_NONE; state3 = STATE3_NONE;
! 139: }
! 140: COMBINE_STATE;
! 141: conv->istate = state;
! 142: return count+1;
! 143: } else
! 144: goto ilseq;
! 145: case STATE_TWOBYTE:
! 146: if (n < count+2)
! 147: goto none;
! 148: if (s[0] < 0x80 && s[1] < 0x80) {
! 149: int ret;
! 150: switch (state2) {
! 151: case STATE2_NONE:
! 152: goto ilseq;
! 153: case STATE2_DESIGNATED_GB2312:
! 154: ret = gb2312_mbtowc(conv,pwc,s,2); break;
! 155: case STATE2_DESIGNATED_CNS11643_1:
! 156: ret = cns11643_1_mbtowc(conv,pwc,s,2); break;
! 157: default: abort();
! 158: }
! 159: if (ret == RET_ILSEQ)
! 160: goto ilseq;
! 161: if (ret != 2) abort();
! 162: COMBINE_STATE;
! 163: conv->istate = state;
! 164: return count+2;
! 165: } else
! 166: goto ilseq;
! 167: default: abort();
! 168: }
! 169:
! 170: none:
! 171: COMBINE_STATE;
! 172: conv->istate = state;
! 173: return RET_TOOFEW(count);
! 174:
! 175: ilseq:
! 176: COMBINE_STATE;
! 177: conv->istate = state;
! 178: return RET_SHIFT_ILSEQ(count);
! 179: }
! 180:
! 181: static int
! 182: iso2022_cn_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
! 183: {
! 184: state_t state = conv->ostate;
! 185: SPLIT_STATE;
! 186: unsigned char buf[3];
! 187: int ret;
! 188:
! 189: /* There is no need to handle Unicode 3.1 tag characters and to look for
! 190: "zh-CN" or "zh-TW" tags, because GB2312 and CNS11643 are disjoint. */
! 191:
! 192: /* Try ASCII. */
! 193: ret = ascii_wctomb(conv,buf,wc,1);
! 194: if (ret != RET_ILUNI) {
! 195: if (ret != 1) abort();
! 196: if (buf[0] < 0x80) {
! 197: int count = (state1 == STATE_ASCII ? 1 : 2);
! 198: if (n < count)
! 199: return RET_TOOSMALL;
! 200: if (state1 != STATE_ASCII) {
! 201: r[0] = SI;
! 202: r += 1;
! 203: state1 = STATE_ASCII;
! 204: }
! 205: r[0] = buf[0];
! 206: if (wc == 0x000a || wc == 0x000d) {
! 207: state2 = STATE2_NONE; state3 = STATE3_NONE;
! 208: }
! 209: COMBINE_STATE;
! 210: conv->ostate = state;
! 211: return count;
! 212: }
! 213: }
! 214:
! 215: /* Try GB 2312-1980. */
! 216: ret = gb2312_wctomb(conv,buf,wc,2);
! 217: if (ret != RET_ILUNI) {
! 218: if (ret != 2) abort();
! 219: if (buf[0] < 0x80 && buf[1] < 0x80) {
! 220: int count = (state2 == STATE2_DESIGNATED_GB2312 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
! 221: if (n < count)
! 222: return RET_TOOSMALL;
! 223: if (state2 != STATE2_DESIGNATED_GB2312) {
! 224: r[0] = ESC;
! 225: r[1] = '$';
! 226: r[2] = ')';
! 227: r[3] = 'A';
! 228: r += 4;
! 229: state2 = STATE2_DESIGNATED_GB2312;
! 230: }
! 231: if (state1 != STATE_TWOBYTE) {
! 232: r[0] = SO;
! 233: r += 1;
! 234: state1 = STATE_TWOBYTE;
! 235: }
! 236: r[0] = buf[0];
! 237: r[1] = buf[1];
! 238: COMBINE_STATE;
! 239: conv->ostate = state;
! 240: return count;
! 241: }
! 242: }
! 243:
! 244: ret = cns11643_wctomb(conv,buf,wc,3);
! 245: if (ret != RET_ILUNI) {
! 246: if (ret != 3) abort();
! 247:
! 248: /* Try CNS 11643-1992 Plane 1. */
! 249: if (buf[0] == 1 && buf[1] < 0x80 && buf[2] < 0x80) {
! 250: int count = (state2 == STATE2_DESIGNATED_CNS11643_1 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
! 251: if (n < count)
! 252: return RET_TOOSMALL;
! 253: if (state2 != STATE2_DESIGNATED_CNS11643_1) {
! 254: r[0] = ESC;
! 255: r[1] = '$';
! 256: r[2] = ')';
! 257: r[3] = 'G';
! 258: r += 4;
! 259: state2 = STATE2_DESIGNATED_CNS11643_1;
! 260: }
! 261: if (state1 != STATE_TWOBYTE) {
! 262: r[0] = SO;
! 263: r += 1;
! 264: state1 = STATE_TWOBYTE;
! 265: }
! 266: r[0] = buf[1];
! 267: r[1] = buf[2];
! 268: COMBINE_STATE;
! 269: conv->ostate = state;
! 270: return count;
! 271: }
! 272:
! 273: /* Try CNS 11643-1992 Plane 2. */
! 274: if (buf[0] == 2 && buf[1] < 0x80 && buf[2] < 0x80) {
! 275: int count = (state3 == STATE3_DESIGNATED_CNS11643_2 ? 0 : 4) + 4;
! 276: if (n < count)
! 277: return RET_TOOSMALL;
! 278: if (state3 != STATE3_DESIGNATED_CNS11643_2) {
! 279: r[0] = ESC;
! 280: r[1] = '$';
! 281: r[2] = '*';
! 282: r[3] = 'H';
! 283: r += 4;
! 284: state3 = STATE3_DESIGNATED_CNS11643_2;
! 285: }
! 286: r[0] = ESC;
! 287: r[1] = 'N';
! 288: r[2] = buf[1];
! 289: r[3] = buf[2];
! 290: COMBINE_STATE;
! 291: conv->ostate = state;
! 292: return count;
! 293: }
! 294: }
! 295:
! 296: return RET_ILUNI;
! 297: }
! 298:
! 299: static int
! 300: iso2022_cn_reset (conv_t conv, unsigned char *r, int n)
! 301: {
! 302: state_t state = conv->ostate;
! 303: SPLIT_STATE;
! 304: (void)state2;
! 305: (void)state3;
! 306: if (state1 != STATE_ASCII) {
! 307: if (n < 1)
! 308: return RET_TOOSMALL;
! 309: r[0] = SI;
! 310: /* conv->ostate = 0; will be done by the caller */
! 311: return 1;
! 312: } else
! 313: return 0;
! 314: }
! 315:
! 316: #undef COMBINE_STATE
! 317: #undef SPLIT_STATE
! 318: #undef STATE3_DESIGNATED_CNS11643_2
! 319: #undef STATE3_NONE
! 320: #undef STATE2_DESIGNATED_CNS11643_1
! 321: #undef STATE2_DESIGNATED_GB2312
! 322: #undef STATE2_NONE
! 323: #undef STATE_TWOBYTE
! 324: #undef STATE_ASCII
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