167 lines
3.8 KiB
C++
167 lines
3.8 KiB
C++
/* Access functions for KS C 5601-1992 based encoding conversion.
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _KSC5601_H
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#define _KSC5601_H 1
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#define KSC5601_HANGUL 2350
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#define KSC5601_HANJA 4888
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#define KSC5601_SYMBOL 986
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#include <gconv.h>
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#include <stdint.h>
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/* Conversion table. */
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extern const uint16_t __ksc5601_hangul_to_ucs[KSC5601_HANGUL];
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extern const uint16_t __ksc5601_sym_to_ucs[];
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extern const uint16_t __ksc5601_sym_from_ucs[KSC5601_SYMBOL][2];
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extern const uint16_t __ksc5601_hanja_to_ucs[KSC5601_HANJA];
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extern const uint16_t __ksc5601_hanja_from_ucs[KSC5601_HANJA][2];
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/*
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static inline wchar_t
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ksc5601_to_ucs4 (char **s, size_t avail)
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*/
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static inline uint32_t
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ksc5601_to_ucs4 (uint16_t s)
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{
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unsigned char ch = s / 256;
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unsigned char ch2;
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int idx;
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/* row 94(0x7e) and row 41(0x49) are user-defined area in KS C 5601 */
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if (ch <= 0x20 || ch >= 0x7e || ch == 0x49)
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return UNKNOWN_10646_CHAR;
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ch2 = s % 256;
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if (ch2 <= 0x20 || ch2 >= 0x7f)
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return UNKNOWN_10646_CHAR;
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idx = (ch - 0x21) * 94 + (ch2 - 0x21);
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/* 1410 = 15 * 94 , 3760 = 40 * 94
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Hangul in KS C 5601 : row 16 - row 40 */
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if (idx >= 1410 && idx < 3760)
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return __ksc5601_hangul_to_ucs[idx-1410];
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else if (idx > 3854)
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/* Hanja : row 42 - row 93 : 3854 = 94 * (42-1) */
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return __ksc5601_hanja_to_ucs[idx-3854];
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else
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return __ksc5601_sym_to_ucs[idx] ?: UNKNOWN_10646_CHAR;
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}
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static inline size_t
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ucs4_to_ksc5601_hangul (uint32_t wch, uint16_t *s)
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{
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int l = 0;
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int m;
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int u = KSC5601_HANGUL - 1;
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uint32_t try;
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while (l <= u)
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{
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try = (uint32_t) __ksc5601_hangul_to_ucs[m=(l+u)/2];
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if (try > wch)
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u = m - 1;
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else if (try < wch)
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l= m + 1;
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else
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{
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*s = (uint16_t) ((m / 94) * 256 + m % 94 + 0x3021) ;
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return 2;
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}
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}
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return 0;
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}
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static inline size_t
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ucs4_to_ksc5601_hanja (uint32_t wch, uint16_t *s)
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{
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int l = 0;
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int m;
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int u = KSC5601_HANJA - 1;
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uint32_t try;
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while (l <= u)
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{
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m = (l + u) / 2;
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try = (uint32_t) __ksc5601_hanja_from_ucs[m][0];
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if (try > wch)
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u=m-1;
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else if (try < wch)
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l = m + 1;
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else
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{
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*s = __ksc5601_hanja_from_ucs[m][1];
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return 2;
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}
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}
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return 0;
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}
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static inline size_t
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ucs4_to_ksc5601_sym (uint32_t wch, uint16_t *s)
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{
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int l = 0;
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int m;
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int u = KSC5601_SYMBOL - 1;
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uint32_t try;
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while (l <= u)
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{
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m = (l + u) / 2;
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try = __ksc5601_sym_from_ucs[m][0];
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if (try > wch)
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u = m - 1;
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else if (try < wch)
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l = m + 1;
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else
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{
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*s = __ksc5601_sym_from_ucs[m][1];
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return 2;
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}
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}
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return 0;
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}
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/*
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static inline size_t
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ucs4_to_ksc5601 (wchar_t wch, char **s, size_t avail)
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*/
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static inline size_t
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ucs4_to_ksc5601 (uint32_t ch, uint16_t *s)
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{
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*s = (uint16_t) UNKNOWN_10646_CHAR; /* FIXIT */
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if (ch >= 0xac00 && ch <= 0xd7a3)
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return ucs4_to_ksc5601_hangul (ch, s);
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else if (ch >= 0x4e00 && ch <= 0x9fff || ch >= 0xf900 && ch <= 0xfa0b)
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return ucs4_to_ksc5601_hanja (ch, s);
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else
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return ucs4_to_ksc5601_sym (ch, s);
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}
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#endif /* ksc5601.h */
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