/* * 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; }