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/*
* Copyright (C) 1999-2001 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., 59 Temple Place -
* Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* BIG5-HKSCS
*/
/*
* BIG5-HKSCS 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
*
* It thereby introduces an irreversible mapping
* 0x8BF8 0x9F9C
* 0xC074 0x9F9C
*/
#include "hkscs.h"
static int
big5hkscs_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
{
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;
}
}
}
}
return hkscs_mbtowc(conv,pwc,s,n);
}
static int
big5hkscs_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
unsigned char buf[2];
int ret;
/* Code set 0 (ASCII) */
ret = ascii_wctomb(conv,r,wc,n);
if (ret != RET_ILUNI)
return 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 < 2)
return RET_TOOSMALL;
r[0] = buf[0];
r[1] = buf[1];
return 2;
}
}
return hkscs_wctomb(conv,r,wc,n);
}
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