| /* |
| * Copyright (C) 1999-2000 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. |
| */ |
| |
| /* |
| * BIG5HKSCS |
| */ |
| |
| /* |
| * BIG5HKSCS 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_ILSEQ) |
| return ret; |
| |
| /* Code set 1 (BIG5 extended) */ |
| ret = big5_wctomb(conv,buf,wc,2); |
| if (ret != RET_ILSEQ) { |
| 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); |
| } |