--- /dev/null
+/*
+ * Copyright (C) 1999-2002, 2006, 2016 Free Software Foundation, Inc.
+ * This file is part of the GNU LIBICONV Library.
+ *
+ * The GNU LIBICONV Library is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * The GNU LIBICONV Library is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * BIG5-HKSCS:2001
+ */
+
+/*
+ * BIG5-HKSCS:2001 can be downloaded from
+ * http://www.info.gov.hk/digital21/eng/hkscs/download.html
+ * http://www.info.gov.hk/digital21/eng/hkscs/index.html
+ *
+ * It extends BIG5-HKSCS:1999 through 116 characters.
+ *
+ * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges
+ *
+ * 0x{88..8D}{40..7E,A1..FE} 757 characters
+ * 0x{8E..A0}{40..7E,A1..FE} 2898 characters
+ * 0x{C6..C8}{40..7E,A1..FE} 359 characters
+ * 0xF9{D6..FE} 41 characters
+ * 0x{FA..FE}{40..7E,A1..FE} 763 characters
+ *
+ * Note that some HKSCS characters are not contained in Unicode 3.2
+ * and are therefore best represented as sequences of Unicode characters:
+ * 0x8862 U+00CA U+0304 LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND MACRON
+ * 0x8864 U+00CA U+030C LATIN CAPITAL LETTER E WITH CIRCUMFLEX AND CARON
+ * 0x88A3 U+00EA U+0304 LATIN SMALL LETTER E WITH CIRCUMFLEX AND MACRON
+ * 0x88A5 U+00EA U+030C LATIN SMALL LETTER E WITH CIRCUMFLEX AND CARON
+ */
+
+#include "hkscs2001.h"
+#include "flushwc.h"
+
+static int
+big5hkscs2001_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
+{
+ ucs4_t last_wc = conv->istate;
+ if (last_wc) {
+ /* Output the buffered character. */
+ conv->istate = 0;
+ *pwc = last_wc;
+ return 0; /* Don't advance the input pointer. */
+ } else {
+ unsigned char c = *s;
+ /* Code set 0 (ASCII) */
+ if (c < 0x80)
+ return ascii_mbtowc(conv,pwc,s,n);
+ /* Code set 1 (BIG5 extended) */
+ if (c >= 0xa1 && c < 0xff) {
+ if (n < 2)
+ return RET_TOOFEW(0);
+ {
+ unsigned char c2 = s[1];
+ if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) {
+ if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) {
+ int ret = big5_mbtowc(conv,pwc,s,2);
+ if (ret != RET_ILSEQ)
+ return ret;
+ }
+ }
+ }
+ }
+ {
+ int ret = hkscs1999_mbtowc(conv,pwc,s,n);
+ if (ret != RET_ILSEQ)
+ return ret;
+ }
+ {
+ int ret = hkscs2001_mbtowc(conv,pwc,s,n);
+ if (ret != RET_ILSEQ)
+ return ret;
+ }
+ if (c == 0x88) {
+ if (n < 2)
+ return RET_TOOFEW(0);
+ {
+ unsigned char c2 = s[1];
+ if (c2 == 0x62 || c2 == 0x64 || c2 == 0xa3 || c2 == 0xa5) {
+ /* It's a composed character. */
+ ucs4_t wc1 = ((c2 >> 3) << 2) + 0x009a; /* = 0x00ca or 0x00ea */
+ ucs4_t wc2 = ((c2 & 6) << 2) + 0x02fc; /* = 0x0304 or 0x030c */
+ /* We cannot output two Unicode characters at once. So,
+ output the first character and buffer the second one. */
+ *pwc = wc1;
+ conv->istate = wc2;
+ return 2;
+ }
+ }
+ }
+ return RET_ILSEQ;
+ }
+}
+
+#define big5hkscs2001_flushwc normal_flushwc
+
+static int
+big5hkscs2001_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
+{
+ int count = 0;
+ unsigned char last = conv->ostate;
+
+ if (last) {
+ /* last is = 0x66 or = 0xa7. */
+ if (wc == 0x0304 || wc == 0x030c) {
+ /* Output the combined character. */
+ if (n >= 2) {
+ r[0] = 0x88;
+ r[1] = last + ((wc & 24) >> 2) - 4; /* = 0x62 or 0x64 or 0xa3 or 0xa5 */
+ conv->ostate = 0;
+ return 2;
+ } else
+ return RET_TOOSMALL;
+ }
+
+ /* Output the buffered character. */
+ if (n < 2)
+ return RET_TOOSMALL;
+ r[0] = 0x88;
+ r[1] = last;
+ r += 2;
+ count = 2;
+ }
+
+ /* Code set 0 (ASCII) */
+ if (wc < 0x0080) {
+ /* Plain ASCII character. */
+ if (n > count) {
+ r[0] = (unsigned char) wc;
+ conv->ostate = 0;
+ return count+1;
+ } else
+ return RET_TOOSMALL;
+ } else {
+ unsigned char buf[2];
+ int ret;
+
+ /* Code set 1 (BIG5 extended) */
+ ret = big5_wctomb(conv,buf,wc,2);
+ if (ret != RET_ILUNI) {
+ if (ret != 2) abort();
+ if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) {
+ if (n >= count+2) {
+ r[0] = buf[0];
+ r[1] = buf[1];
+ conv->ostate = 0;
+ return count+2;
+ } else
+ return RET_TOOSMALL;
+ }
+ }
+ ret = hkscs1999_wctomb(conv,buf,wc,2);
+ if (ret != RET_ILUNI) {
+ if (ret != 2) abort();
+ if ((wc & ~0x0020) == 0x00ca) {
+ /* A possible first character of a multi-character sequence. We have to
+ buffer it. */
+ if (!(buf[0] == 0x88 && (buf[1] == 0x66 || buf[1] == 0xa7))) abort();
+ conv->ostate = buf[1]; /* = 0x66 or = 0xa7 */
+ return count+0;
+ }
+ if (n >= count+2) {
+ r[0] = buf[0];
+ r[1] = buf[1];
+ conv->ostate = 0;
+ return count+2;
+ } else
+ return RET_TOOSMALL;
+ }
+ ret = hkscs2001_wctomb(conv,buf,wc,2);
+ if (ret != RET_ILUNI) {
+ if (ret != 2) abort();
+ if (n >= count+2) {
+ r[0] = buf[0];
+ r[1] = buf[1];
+ conv->ostate = 0;
+ return count+2;
+ } else
+ return RET_TOOSMALL;
+ }
+ return RET_ILUNI;
+ }
+}
+
+static int
+big5hkscs2001_reset (conv_t conv, unsigned char *r, size_t n)
+{
+ unsigned char last = conv->ostate;
+
+ if (last) {
+ if (n < 2)
+ return RET_TOOSMALL;
+ r[0] = 0x88;
+ r[1] = last;
+ /* conv->ostate = 0; will be done by the caller */
+ return 2;
+ } else
+ return 0;
+}
projects / lyx.git / blobdiff