1/* 2 * Copyright (C) 1999-2001 Free Software Foundation, Inc. 3 * This file is part of the GNU LIBICONV Library. 4 * 5 * The GNU LIBICONV Library is free software; you can redistribute it 6 * and/or modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either version 2 8 * of the License, or (at your option) any later version. 9 * 10 * The GNU LIBICONV Library is distributed in the hope that it will be 11 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public 16 * License along with the GNU LIBICONV Library; see the file COPYING.LIB. 17 * If not, write to the Free Software Foundation, Inc., 59 Temple Place - 18 * Suite 330, Boston, MA 02111-1307, USA. 19 */ 20 21/* 22 * BIG5-HKSCS 23 */ 24 25/* 26 * BIG5-HKSCS can be downloaded from 27 * http://www.info.gov.hk/digital21/eng/hkscs/download.html 28 * http://www.info.gov.hk/digital21/eng/hkscs/index.html 29 * 30 * It extends BIG5 (without the rows 0xC6..0xC7) through the ranges 31 * 32 * 0x{88..8D}{40..7E,A1..FE} 641 characters 33 * 0x{8E..A0}{40..7E,A1..FE} 2898 characters 34 * 0x{C6..C8}{40..7E,A1..FE} 359 characters 35 * 0xF9{D6..FE} 41 characters 36 * 0x{FA..FE}{40..7E,A1..FE} 763 characters 37 * 38 * It thereby introduces an irreversible mapping 39 * 0x8BF8 0x9F9C 40 * 0xC074 0x9F9C 41 */ 42 43#include "hkscs.h" 44 45static int 46big5hkscs_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n) 47{ 48 unsigned char c = *s; 49 /* Code set 0 (ASCII) */ 50 if (c < 0x80) 51 return ascii_mbtowc(conv,pwc,s,n); 52 /* Code set 1 (BIG5 extended) */ 53 if (c >= 0xa1 && c < 0xff) { 54 if (n < 2) 55 return RET_TOOFEW(0); 56 { 57 unsigned char c2 = s[1]; 58 if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff)) { 59 if (!((c == 0xc6 && c2 >= 0xa1) || c == 0xc7)) { 60 int ret = big5_mbtowc(conv,pwc,s,2); 61 if (ret != RET_ILSEQ) 62 return ret; 63 } 64 } 65 } 66 } 67 return hkscs_mbtowc(conv,pwc,s,n); 68} 69 70static int 71big5hkscs_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n) 72{ 73 unsigned char buf[2]; 74 int ret; 75 76 /* Code set 0 (ASCII) */ 77 ret = ascii_wctomb(conv,r,wc,n); 78 if (ret != RET_ILUNI) 79 return ret; 80 81 /* Code set 1 (BIG5 extended) */ 82 ret = big5_wctomb(conv,buf,wc,2); 83 if (ret != RET_ILUNI) { 84 if (ret != 2) abort(); 85 if (!((buf[0] == 0xc6 && buf[1] >= 0xa1) || buf[0] == 0xc7)) { 86 if (n < 2) 87 return RET_TOOSMALL; 88 r[0] = buf[0]; 89 r[1] = buf[1]; 90 return 2; 91 } 92 } 93 return hkscs_wctomb(conv,r,wc,n); 94} 95