Annotation of embedaddon/libiconv/lib/big5hkscs2004.h, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 1999-2002, 2006 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: * BIG5-HKSCS:2004
! 23: */
! 24:
! 25: /*
! 26: * BIG5-HKSCS:2004 can be downloaded from
! 27: * http://www.info.gov.hk/digital21/eng/hkscs/download.html
! 28: * http://www.info.gov.hk/digital21/eng/hkscs/index.html
! 29: *
! 30: * It extends BIG5-HKSCS:2001 through 123 characters.
! 31: *
! 32: * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
! 33: *
! 34: * 0x{87..8D}{40..7E,A1..FE} 880 characters
! 35: * 0x{8E..A0}{40..7E,A1..FE} 2898 characters
! 36: * 0x{C6..C8}{40..7E,A1..FE} 359 characters
! 37: * 0xF9{D6..FE} 41 characters
! 38: * 0x{FA..FE}{40..7E,A1..FE} 763 characters
! 39: *
! 40: * Note that some HKSCS characters are not contained in Unicode 3.2
! 41: * and are therefore best represented as sequences of Unicode characters:
! 42: * 0x8862 U+00CA U+0304 LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON
! 43: * 0x8864 U+00CA U+030C LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON
! 44: * 0x88A3 U+00EA U+0304 LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON
! 45: * 0x88A5 U+00EA U+030C LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON
! 46: */
! 47:
! 48: #include "hkscs2004.h"
! 49: #include "flushwc.h"
! 50:
! 51: static int
! 52: big5hkscs2004_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
! 53: {
! 54: ucs4_t last_wc = conv->istate;
! 55: if (last_wc) {
! 56: /* Output the buffered character. */
! 57: conv->istate = 0;
! 58: *pwc = last_wc;
! 59: return 0; /* Don't advance the input pointer. */
! 60: } else {
! 61: unsigned char c = *s;
! 62: /* Code set 0 (ASCII) */
! 63: if (c < 0x80)
! 64: return ascii_mbtowc(conv,pwc,s,n);
! 65: /* Code set 1 (BIG5 extended) */
! 66: if (c >= 0xa1 && c < 0xff) {
! 67: if (n < 2)
! 68: return RET_TOOFEW(0);
! 69: {
! 70: unsigned char c2 = s[1];
! 71: if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
! 72: if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
! 73: int ret = big5_mbtowc(conv,pwc,s,2);
! 74: if (ret != RET_ILSEQ)
! 75: return ret;
! 76: }
! 77: }
! 78: }
! 79: }
! 80: {
! 81: int ret = hkscs1999_mbtowc(conv,pwc,s,n);
! 82: if (ret != RET_ILSEQ)
! 83: return ret;
! 84: }
! 85: {
! 86: int ret = hkscs2001_mbtowc(conv,pwc,s,n);
! 87: if (ret != RET_ILSEQ)
! 88: return ret;
! 89: }
! 90: {
! 91: int ret = hkscs2004_mbtowc(conv,pwc,s,n);
! 92: if (ret != RET_ILSEQ)
! 93: return ret;
! 94: }
! 95: if (c == 0x88) {
! 96: if (n < 2)
! 97: return RET_TOOFEW(0);
! 98: {
! 99: unsigned char c2 = s[1];
! 100: if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
! 101: /* It's a composed character. */
! 102: ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
! 103: ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
! 104: /* We cannot output two Unicode characters at once. So,
! 105: output the first character and buffer the second one. */
! 106: *pwc = wc1;
! 107: conv->istate = wc2;
! 108: return 2;
! 109: }
! 110: }
! 111: }
! 112: return RET_ILSEQ;
! 113: }
! 114: }
! 115:
! 116: #define big5hkscs2004_flushwc normal_flushwc
! 117:
! 118: static int
! 119: big5hkscs2004_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
! 120: {
! 121: int count = 0;
! 122: unsigned char last = conv->ostate;
! 123:
! 124: if (last) {
! 125: /* last is = 0x66 or = 0xa7. */
! 126: if (wc == 0x0304 || wc == 0x030c) {
! 127: /* Output the combined character. */
! 128: if (n >= 2) {
! 129: r[0] = 0x88;
! 130: r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
! 131: conv->ostate = 0;
! 132: return 2;
! 133: } else
! 134: return RET_TOOSMALL;
! 135: }
! 136:
! 137: /* Output the buffered character. */
! 138: if (n < 2)
! 139: return RET_TOOSMALL;
! 140: r[0] = 0x88;
! 141: r[1] = last;
! 142: r += 2;
! 143: count = 2;
! 144: }
! 145:
! 146: /* Code set 0 (ASCII) */
! 147: if (wc < 0x0080) {
! 148: /* Plain ASCII character. */
! 149: if (n > count) {
! 150: r[0] = (unsigned char) wc;
! 151: conv->ostate = 0;
! 152: return count+1;
! 153: } else
! 154: return RET_TOOSMALL;
! 155: } else {
! 156: unsigned char buf[2];
! 157: int ret;
! 158:
! 159: /* Code set 1 (BIG5 extended) */
! 160: ret = big5_wctomb(conv,buf,wc,2);
! 161: if (ret != RET_ILUNI) {
! 162: if (ret != 2) abort();
! 163: if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
! 164: if (n >= count+2) {
! 165: r[0] = buf[0];
! 166: r[1] = buf[1];
! 167: conv->ostate = 0;
! 168: return count+2;
! 169: } else
! 170: return RET_TOOSMALL;
! 171: }
! 172: }
! 173: ret = hkscs1999_wctomb(conv,buf,wc,2);
! 174: if (ret != RET_ILUNI) {
! 175: if (ret != 2) abort();
! 176: if ((wc & ~0x0020) == 0x00ca) {
! 177: /* A possible first character of a multi-character sequence. We have to
! 178: buffer it. */
! 179: if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
! 180: conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
! 181: return count+0;
! 182: }
! 183: if (n >= count+2) {
! 184: r[0] = buf[0];
! 185: r[1] = buf[1];
! 186: conv->ostate = 0;
! 187: return count+2;
! 188: } else
! 189: return RET_TOOSMALL;
! 190: }
! 191: ret = hkscs2001_wctomb(conv,buf,wc,2);
! 192: if (ret != RET_ILUNI) {
! 193: if (ret != 2) abort();
! 194: if (n >= count+2) {
! 195: r[0] = buf[0];
! 196: r[1] = buf[1];
! 197: conv->ostate = 0;
! 198: return count+2;
! 199: } else
! 200: return RET_TOOSMALL;
! 201: }
! 202: ret = hkscs2004_wctomb(conv,buf,wc,2);
! 203: if (ret != RET_ILUNI) {
! 204: if (ret != 2) abort();
! 205: if (n >= count+2) {
! 206: r[0] = buf[0];
! 207: r[1] = buf[1];
! 208: conv->ostate = 0;
! 209: return count+2;
! 210: } else
! 211: return RET_TOOSMALL;
! 212: }
! 213: return RET_ILUNI;
! 214: }
! 215: }
! 216:
! 217: static int
! 218: big5hkscs2004_reset (conv_t conv, unsigned char *r, int n)
! 219: {
! 220: unsigned char last = conv->ostate;
! 221:
! 222: if (last) {
! 223: if (n < 2)
! 224: return RET_TOOSMALL;
! 225: r[0] = 0x88;
! 226: r[1] = last;
! 227: /* conv->ostate = 0; will be done by the caller */
! 228: return 2;
! 229: } else
! 230: return 0;
! 231: }
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