/*
* Copyright (C) 1999-2002, 2006 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, write to the Free Software Foundation, Inc., 51 Franklin Street,
* Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* BIG5-HKSCS:1999
*/
/*
* BIG5-HKSCS:1999 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 (without the rows 0xC6..0xC7) through the ranges
*
* 0x{88..8D}{40..7E,A1..FE} 641 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 "hkscs1999.h"
#include "flushwc.h"
static int
big5hkscs1999_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int 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;
}
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 big5hkscs1999_flushwc normal_flushwc
static int
big5hkscs1999_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int 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;
}
return RET_ILUNI;
}
}
static int
big5hkscs1999_reset (conv_t conv, unsigned char *r, int 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;
}
