215 lines
6.1 KiB
C
215 lines
6.1 KiB
C
/*
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* Copyright (C) 1999-2002, 2006 Free Software Foundation, Inc.
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* This file is part of the GNU LIBICONV Library.
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*
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* The GNU LIBICONV Library is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* The GNU LIBICONV Library is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
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* If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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* Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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* BIG5-HKSCS:2001
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*/
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/*
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* BIG5-HKSCS:2001 can be downloaded from
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* http://www.info.gov.hk/digital21/eng/hkscs/download.html
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* http://www.info.gov.hk/digital21/eng/hkscs/index.html
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*
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* It extends BIG5-HKSCS:1999 through 116 characters.
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*
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* It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
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*
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* 0x{88..8D}{40..7E,A1..FE} 757 characters
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* 0x{8E..A0}{40..7E,A1..FE} 2898 characters
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* 0x{C6..C8}{40..7E,A1..FE} 359 characters
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* 0xF9{D6..FE} 41 characters
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* 0x{FA..FE}{40..7E,A1..FE} 763 characters
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*
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* Note that some HKSCS characters are not contained in Unicode 3.2
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* and are therefore best represented as sequences of Unicode characters:
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* 0x8862 U+00CA U+0304 LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON
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* 0x8864 U+00CA U+030C LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON
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* 0x88A3 U+00EA U+0304 LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON
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* 0x88A5 U+00EA U+030C LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON
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*/
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#include "hkscs2001.h"
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#include "flushwc.h"
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static int
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big5hkscs2001_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
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{
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ucs4_t last_wc = conv->istate;
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if (last_wc) {
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/* Output the buffered character. */
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conv->istate = 0;
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*pwc = last_wc;
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return 0; /* Don't advance the input pointer. */
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} else {
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unsigned char c = *s;
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/* Code set 0 (ASCII) */
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if (c < 0x80)
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return ascii_mbtowc(conv,pwc,s,n);
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/* Code set 1 (BIG5 extended) */
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if (c >= 0xa1 && c < 0xff) {
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if (n < 2)
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return RET_TOOFEW(0);
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{
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unsigned char c2 = s[1];
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if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
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if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
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int ret = big5_mbtowc(conv,pwc,s,2);
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if (ret != RET_ILSEQ)
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return ret;
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}
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}
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}
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}
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{
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int ret = hkscs1999_mbtowc(conv,pwc,s,n);
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if (ret != RET_ILSEQ)
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return ret;
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}
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{
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int ret = hkscs2001_mbtowc(conv,pwc,s,n);
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if (ret != RET_ILSEQ)
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return ret;
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}
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if (c == 0x88) {
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if (n < 2)
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return RET_TOOFEW(0);
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{
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unsigned char c2 = s[1];
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if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
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/* It's a composed character. */
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ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
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ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
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/* We cannot output two Unicode characters at once. So,
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output the first character and buffer the second one. */
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*pwc = wc1;
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conv->istate = wc2;
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return 2;
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}
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}
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}
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return RET_ILSEQ;
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}
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}
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#define big5hkscs2001_flushwc normal_flushwc
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static int
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big5hkscs2001_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
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{
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int count = 0;
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unsigned char last = conv->ostate;
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if (last) {
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/* last is = 0x66 or = 0xa7. */
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if (wc == 0x0304 || wc == 0x030c) {
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/* Output the combined character. */
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if (n >= 2) {
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r[0] = 0x88;
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r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
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conv->ostate = 0;
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return 2;
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} else
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return RET_TOOSMALL;
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}
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/* Output the buffered character. */
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if (n < 2)
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return RET_TOOSMALL;
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r[0] = 0x88;
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r[1] = last;
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r += 2;
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count = 2;
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}
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/* Code set 0 (ASCII) */
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if (wc < 0x0080) {
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/* Plain ASCII character. */
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if (n > count) {
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r[0] = (unsigned char) wc;
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conv->ostate = 0;
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return count+1;
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} else
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return RET_TOOSMALL;
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} else {
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unsigned char buf[2];
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int ret;
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/* Code set 1 (BIG5 extended) */
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ret = big5_wctomb(conv,buf,wc,2);
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if (ret != RET_ILUNI) {
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if (ret != 2) abort();
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if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
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if (n >= count+2) {
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r[0] = buf[0];
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r[1] = buf[1];
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conv->ostate = 0;
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return count+2;
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} else
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return RET_TOOSMALL;
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}
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}
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ret = hkscs1999_wctomb(conv,buf,wc,2);
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if (ret != RET_ILUNI) {
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if (ret != 2) abort();
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if ((wc & ~0x0020) == 0x00ca) {
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/* A possible first character of a multi-character sequence. We have to
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buffer it. */
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if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
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conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
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return count+0;
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}
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if (n >= count+2) {
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r[0] = buf[0];
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r[1] = buf[1];
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conv->ostate = 0;
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return count+2;
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} else
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return RET_TOOSMALL;
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}
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ret = hkscs2001_wctomb(conv,buf,wc,2);
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if (ret != RET_ILUNI) {
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if (ret != 2) abort();
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if (n >= count+2) {
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r[0] = buf[0];
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r[1] = buf[1];
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conv->ostate = 0;
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return count+2;
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} else
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return RET_TOOSMALL;
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}
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return RET_ILUNI;
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}
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}
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static int
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big5hkscs2001_reset (conv_t conv, unsigned char *r, int n)
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{
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unsigned char last = conv->ostate;
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if (last) {
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if (n < 2)
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return RET_TOOSMALL;
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r[0] = 0x88;
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r[1] = last;
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/* conv->ostate = 0; will be done by the caller */
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return 2;
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} else
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return 0;
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}
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