Annotation of embedaddon/libiconv/lib/iso2022_kr.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-KR
! 23: */
! 24:
! 25: /* Specification: RFC 1557 */
! 26:
! 27: /* Note: CJK.INF says the SO designator needs to appear only once at the
! 28: beginning of a text, but to decrease the risk of ambiguities, when
! 29: producing ISO-2022-KR, we repeat the designator in every line containing
! 30: SO characters. RFC 1557 does not mandate this. */
! 31:
! 32: #define ESC 0x1b
! 33: #define SO 0x0e
! 34: #define SI 0x0f
! 35:
! 36: /*
! 37: * The state is composed of one of the following values
! 38: */
! 39: #define STATE_ASCII 0
! 40: #define STATE_TWOBYTE 1
! 41: /*
! 42: * and one of the following values, << 8
! 43: */
! 44: #define STATE2_NONE 0
! 45: #define STATE2_DESIGNATED_KSC5601 1
! 46:
! 47: #define SPLIT_STATE \
! 48: unsigned int state1 = state & 0xff, state2 = state >> 8
! 49: #define COMBINE_STATE \
! 50: state = (state2 << 8) | state1
! 51:
! 52: static int
! 53: iso2022_kr_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
! 54: {
! 55: state_t state = conv->istate;
! 56: SPLIT_STATE;
! 57: int count = 0;
! 58: unsigned char c;
! 59: for (;;) {
! 60: c = *s;
! 61: if (c == ESC) {
! 62: if (n < count+4)
! 63: goto none;
! 64: if (s[1] == '$') {
! 65: if (s[2] == ')') {
! 66: if (s[3] == 'C') {
! 67: state2 = STATE2_DESIGNATED_KSC5601;
! 68: s += 4; count += 4;
! 69: if (n < count+1)
! 70: goto none;
! 71: continue;
! 72: }
! 73: }
! 74: }
! 75: goto ilseq;
! 76: }
! 77: if (c == SO) {
! 78: if (state2 != STATE2_DESIGNATED_KSC5601)
! 79: goto ilseq;
! 80: state1 = STATE_TWOBYTE;
! 81: s++; count++;
! 82: if (n < count+1)
! 83: goto none;
! 84: continue;
! 85: }
! 86: if (c == SI) {
! 87: state1 = STATE_ASCII;
! 88: s++; count++;
! 89: if (n < count+1)
! 90: goto none;
! 91: continue;
! 92: }
! 93: break;
! 94: }
! 95: switch (state1) {
! 96: case STATE_ASCII:
! 97: if (c < 0x80) {
! 98: int ret = ascii_mbtowc(conv,pwc,s,1);
! 99: if (ret == RET_ILSEQ)
! 100: goto ilseq;
! 101: if (ret != 1) abort();
! 102: #if 0 /* Accept ISO-2022-KR according to CJK.INF. */
! 103: if (*pwc == 0x000a || *pwc == 0x000d)
! 104: state2 = STATE2_NONE;
! 105: #endif
! 106: COMBINE_STATE;
! 107: conv->istate = state;
! 108: return count+1;
! 109: } else
! 110: goto ilseq;
! 111: case STATE_TWOBYTE:
! 112: if (n < count+2)
! 113: goto none;
! 114: if (state2 != STATE2_DESIGNATED_KSC5601) abort();
! 115: if (s[0] < 0x80 && s[1] < 0x80) {
! 116: int ret = ksc5601_mbtowc(conv,pwc,s,2);
! 117: if (ret == RET_ILSEQ)
! 118: goto ilseq;
! 119: if (ret != 2) abort();
! 120: COMBINE_STATE;
! 121: conv->istate = state;
! 122: return count+2;
! 123: } else
! 124: goto ilseq;
! 125: default: abort();
! 126: }
! 127:
! 128: none:
! 129: COMBINE_STATE;
! 130: conv->istate = state;
! 131: return RET_TOOFEW(count);
! 132:
! 133: ilseq:
! 134: COMBINE_STATE;
! 135: conv->istate = state;
! 136: return RET_SHIFT_ILSEQ(count);
! 137: }
! 138:
! 139: static int
! 140: iso2022_kr_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
! 141: {
! 142: state_t state = conv->ostate;
! 143: SPLIT_STATE;
! 144: unsigned char buf[2];
! 145: int ret;
! 146:
! 147: /* Try ASCII. */
! 148: ret = ascii_wctomb(conv,buf,wc,1);
! 149: if (ret != RET_ILUNI) {
! 150: if (ret != 1) abort();
! 151: if (buf[0] < 0x80) {
! 152: int count = (state1 == STATE_ASCII ? 1 : 2);
! 153: if (n < count)
! 154: return RET_TOOSMALL;
! 155: if (state1 != STATE_ASCII) {
! 156: r[0] = SI;
! 157: r += 1;
! 158: state1 = STATE_ASCII;
! 159: }
! 160: r[0] = buf[0];
! 161: if (wc == 0x000a || wc == 0x000d)
! 162: state2 = STATE2_NONE;
! 163: COMBINE_STATE;
! 164: conv->ostate = state;
! 165: return count;
! 166: }
! 167: }
! 168:
! 169: /* Try KS C 5601-1992. */
! 170: ret = ksc5601_wctomb(conv,buf,wc,2);
! 171: if (ret != RET_ILUNI) {
! 172: if (ret != 2) abort();
! 173: if (buf[0] < 0x80 && buf[1] < 0x80) {
! 174: int count = (state2 == STATE2_DESIGNATED_KSC5601 ? 0 : 4) + (state1 == STATE_TWOBYTE ? 0 : 1) + 2;
! 175: if (n < count)
! 176: return RET_TOOSMALL;
! 177: if (state2 != STATE2_DESIGNATED_KSC5601) {
! 178: r[0] = ESC;
! 179: r[1] = '$';
! 180: r[2] = ')';
! 181: r[3] = 'C';
! 182: r += 4;
! 183: state2 = STATE2_DESIGNATED_KSC5601;
! 184: }
! 185: if (state1 != STATE_TWOBYTE) {
! 186: r[0] = SO;
! 187: r += 1;
! 188: state1 = STATE_TWOBYTE;
! 189: }
! 190: r[0] = buf[0];
! 191: r[1] = buf[1];
! 192: COMBINE_STATE;
! 193: conv->ostate = state;
! 194: return count;
! 195: }
! 196: }
! 197:
! 198: return RET_ILUNI;
! 199: }
! 200:
! 201: static int
! 202: iso2022_kr_reset (conv_t conv, unsigned char *r, int n)
! 203: {
! 204: state_t state = conv->ostate;
! 205: SPLIT_STATE;
! 206: (void)state2;
! 207: if (state1 != STATE_ASCII) {
! 208: if (n < 1)
! 209: return RET_TOOSMALL;
! 210: r[0] = SI;
! 211: /* conv->ostate = 0; will be done by the caller */
! 212: return 1;
! 213: } else
! 214: return 0;
! 215: }
! 216:
! 217: #undef COMBINE_STATE
! 218: #undef SPLIT_STATE
! 219: #undef STATE2_DESIGNATED_KSC5601
! 220: #undef STATE2_NONE
! 221: #undef STATE_TWOBYTE
! 222: #undef STATE_ASCII
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