196 lines
4.6 KiB
C++
196 lines
4.6 KiB
C++
/* Access functions for KS C 5601-1992 based encoding conversion.
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Copyright (C) 1998-2022 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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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 989
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#include <gconv.h>
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#include <stdint.h>
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/* Structure to map from UCS to KSC. This structure should be packed
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on all platforms. */
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struct map
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{
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uint16_t ucs;
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char val[2];
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};
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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 struct map __ksc5601_sym_from_ucs[KSC5601_SYMBOL];
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extern const uint16_t __ksc5601_hanja_to_ucs[KSC5601_HANJA];
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extern const struct map __ksc5601_hanja_from_ucs[KSC5601_HANJA];
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static inline uint32_t
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__attribute ((always_inline))
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ksc5601_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
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{
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unsigned char ch = **s;
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unsigned char ch2;
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int idx;
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if (avail < 2)
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return 0;
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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 < offset || (ch - offset) <= 0x20 || (ch - offset) >= 0x7e
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|| (ch - offset) == 0x49)
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return __UNKNOWN_10646_CHAR;
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ch2 = (*s)[1];
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if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
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return __UNKNOWN_10646_CHAR;
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idx = (ch - offset - 0x21) * 94 + (ch2 - offset - 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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*s += 2;
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if (idx >= 1410 && idx < 1410 + KSC5601_HANGUL)
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return (__ksc5601_hangul_to_ucs[idx - 1410]
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?: (*s -= 2, __UNKNOWN_10646_CHAR));
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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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?: (*s -= 2, __UNKNOWN_10646_CHAR));
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else if (idx <= 1114)
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return __ksc5601_sym_to_ucs[idx] ?: (*s -= 2, __UNKNOWN_10646_CHAR);
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*s -= 2;
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return __UNKNOWN_10646_CHAR;
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}
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static inline size_t
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__attribute ((always_inline))
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ucs4_to_ksc5601_hangul (uint32_t wch, unsigned char *s, size_t avail)
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{
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int l = 0;
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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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int m = (l + u) / 2;
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try = (uint32_t) __ksc5601_hangul_to_ucs[m];
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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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if (avail < 2)
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return 0;
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s[0] = (m / 94) + 0x30;
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s[1] = (m % 94) + 0x21;
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return 2;
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}
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}
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return __UNKNOWN_10646_CHAR;
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}
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static inline size_t
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__attribute ((always_inline))
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ucs4_to_ksc5601_hanja (uint32_t wch, unsigned char *s, size_t avail)
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{
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int l = 0;
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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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int m = (l + u) / 2;
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try = (uint32_t) __ksc5601_hanja_from_ucs[m].ucs;
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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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if (avail < 2)
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return 0;
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s[0] = __ksc5601_hanja_from_ucs[m].val[0];
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s[1] = __ksc5601_hanja_from_ucs[m].val[1];
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return 2;
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}
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}
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return __UNKNOWN_10646_CHAR;
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}
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static inline size_t
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__attribute ((always_inline))
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ucs4_to_ksc5601_sym (uint32_t wch, unsigned char *s, size_t avail)
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{
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int l = 0;
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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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int m = (l + u) / 2;
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try = __ksc5601_sym_from_ucs[m].ucs;
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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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if (avail < 2)
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return 0;
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s[0] = __ksc5601_sym_from_ucs[m].val[0];
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s[1] = __ksc5601_sym_from_ucs[m].val[1];
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return 2;
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}
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}
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return __UNKNOWN_10646_CHAR;
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}
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static inline size_t
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__attribute ((always_inline))
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ucs4_to_ksc5601 (uint32_t wch, unsigned char *s, size_t avail)
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{
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if (wch >= 0xac00 && wch <= 0xd7a3)
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return ucs4_to_ksc5601_hangul (wch, s, avail);
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else if ((wch >= 0x4e00 && wch <= 0x9fff)
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|| (wch >= 0xf900 && wch <= 0xfa0b))
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return ucs4_to_ksc5601_hanja (wch, s, avail);
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else
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return ucs4_to_ksc5601_sym (wch, s, avail);
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}
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#endif /* ksc5601.h */
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