lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Access functions for KS C 5601-1992 based encoding conversion. |
| 2 | Copyright (C) 1998-2015 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _KSC5601_H |
| 20 | #define _KSC5601_H 1 |
| 21 | |
| 22 | #define KSC5601_HANGUL 2350 |
| 23 | #define KSC5601_HANJA 4888 |
| 24 | #define KSC5601_SYMBOL 989 |
| 25 | |
| 26 | #include <gconv.h> |
| 27 | #include <stdint.h> |
| 28 | |
| 29 | /* Structure to map from UCS to KSC. This structure should be packed |
| 30 | on all platforms. */ |
| 31 | struct map |
| 32 | { |
| 33 | uint16_t ucs; |
| 34 | char val[2]; |
| 35 | }; |
| 36 | |
| 37 | /* Conversion table. */ |
| 38 | extern const uint16_t __ksc5601_hangul_to_ucs[KSC5601_HANGUL]; |
| 39 | extern const uint16_t __ksc5601_sym_to_ucs[]; |
| 40 | extern const struct map __ksc5601_sym_from_ucs[KSC5601_SYMBOL]; |
| 41 | extern const uint16_t __ksc5601_hanja_to_ucs[KSC5601_HANJA]; |
| 42 | extern const struct map __ksc5601_hanja_from_ucs[KSC5601_HANJA]; |
| 43 | |
| 44 | |
| 45 | static inline uint32_t |
| 46 | __attribute ((always_inline)) |
| 47 | ksc5601_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset) |
| 48 | { |
| 49 | unsigned char ch = **s; |
| 50 | unsigned char ch2; |
| 51 | int idx; |
| 52 | |
| 53 | /* row 94(0x7e) and row 41(0x49) are user-defined area in KS C 5601 */ |
| 54 | |
| 55 | if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) >= 0x7e |
| 56 | || (ch - offset) == 0x49) |
| 57 | return __UNKNOWN_10646_CHAR; |
| 58 | |
| 59 | if (avail < 2) |
| 60 | return 0; |
| 61 | |
| 62 | ch2 = (*s)[1]; |
| 63 | if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f) |
| 64 | return __UNKNOWN_10646_CHAR; |
| 65 | |
| 66 | idx = (ch - offset - 0x21) * 94 + (ch2 - offset - 0x21); |
| 67 | |
| 68 | /* 1410 = 15 * 94 , 3760 = 40 * 94 |
| 69 | Hangul in KS C 5601 : row 16 - row 40 */ |
| 70 | |
| 71 | *s += 2; |
| 72 | |
| 73 | if (idx >= 1410 && idx < 1410 + KSC5601_HANGUL) |
| 74 | return (__ksc5601_hangul_to_ucs[idx - 1410] |
| 75 | ?: (*s -= 2, __UNKNOWN_10646_CHAR)); |
| 76 | else if (idx >= 3854) |
| 77 | /* Hanja : row 42 - row 93 : 3854 = 94 * (42-1) */ |
| 78 | return (__ksc5601_hanja_to_ucs[idx - 3854] |
| 79 | ?: (*s -= 2, __UNKNOWN_10646_CHAR)); |
| 80 | else if (idx <= 1114) |
| 81 | return __ksc5601_sym_to_ucs[idx] ?: (*s -= 2, __UNKNOWN_10646_CHAR); |
| 82 | |
| 83 | *s -= 2; |
| 84 | return __UNKNOWN_10646_CHAR; |
| 85 | } |
| 86 | |
| 87 | static inline size_t |
| 88 | __attribute ((always_inline)) |
| 89 | ucs4_to_ksc5601_hangul (uint32_t wch, unsigned char *s, size_t avail) |
| 90 | { |
| 91 | int l = 0; |
| 92 | int u = KSC5601_HANGUL - 1; |
| 93 | uint32_t try; |
| 94 | |
| 95 | while (l <= u) |
| 96 | { |
| 97 | int m = (l + u) / 2; |
| 98 | try = (uint32_t) __ksc5601_hangul_to_ucs[m]; |
| 99 | if (try > wch) |
| 100 | u = m - 1; |
| 101 | else if (try < wch) |
| 102 | l= m + 1; |
| 103 | else |
| 104 | { |
| 105 | if (avail < 2) |
| 106 | return 0; |
| 107 | |
| 108 | s[0] = (m / 94) + 0x30; |
| 109 | s[1] = (m % 94) + 0x21; |
| 110 | |
| 111 | return 2; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | return __UNKNOWN_10646_CHAR; |
| 116 | } |
| 117 | |
| 118 | |
| 119 | static inline size_t |
| 120 | __attribute ((always_inline)) |
| 121 | ucs4_to_ksc5601_hanja (uint32_t wch, unsigned char *s, size_t avail) |
| 122 | { |
| 123 | int l = 0; |
| 124 | int u = KSC5601_HANJA - 1; |
| 125 | uint32_t try; |
| 126 | |
| 127 | while (l <= u) |
| 128 | { |
| 129 | int m = (l + u) / 2; |
| 130 | try = (uint32_t) __ksc5601_hanja_from_ucs[m].ucs; |
| 131 | if (try > wch) |
| 132 | u=m-1; |
| 133 | else if (try < wch) |
| 134 | l = m + 1; |
| 135 | else |
| 136 | { |
| 137 | if (avail < 2) |
| 138 | return 0; |
| 139 | |
| 140 | s[0] = __ksc5601_hanja_from_ucs[m].val[0]; |
| 141 | s[1] = __ksc5601_hanja_from_ucs[m].val[1]; |
| 142 | |
| 143 | return 2; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | return __UNKNOWN_10646_CHAR; |
| 148 | } |
| 149 | |
| 150 | static inline size_t |
| 151 | __attribute ((always_inline)) |
| 152 | ucs4_to_ksc5601_sym (uint32_t wch, unsigned char *s, size_t avail) |
| 153 | { |
| 154 | int l = 0; |
| 155 | int u = KSC5601_SYMBOL - 1; |
| 156 | uint32_t try; |
| 157 | |
| 158 | while (l <= u) |
| 159 | { |
| 160 | int m = (l + u) / 2; |
| 161 | try = __ksc5601_sym_from_ucs[m].ucs; |
| 162 | if (try > wch) |
| 163 | u = m - 1; |
| 164 | else if (try < wch) |
| 165 | l = m + 1; |
| 166 | else |
| 167 | { |
| 168 | if (avail < 2) |
| 169 | return 0; |
| 170 | |
| 171 | s[0] = __ksc5601_sym_from_ucs[m].val[0]; |
| 172 | s[1] = __ksc5601_sym_from_ucs[m].val[1]; |
| 173 | |
| 174 | return 2; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | return __UNKNOWN_10646_CHAR; |
| 179 | } |
| 180 | |
| 181 | |
| 182 | static inline size_t |
| 183 | __attribute ((always_inline)) |
| 184 | ucs4_to_ksc5601 (uint32_t wch, unsigned char *s, size_t avail) |
| 185 | { |
| 186 | if (wch >= 0xac00 && wch <= 0xd7a3) |
| 187 | return ucs4_to_ksc5601_hangul (wch, s, avail); |
| 188 | else if ((wch >= 0x4e00 && wch <= 0x9fff) |
| 189 | || (wch >= 0xf900 && wch <= 0xfa0b)) |
| 190 | return ucs4_to_ksc5601_hanja (wch, s, avail); |
| 191 | else |
| 192 | return ucs4_to_ksc5601_sym (wch, s, avail); |
| 193 | } |
| 194 | |
| 195 | #endif /* ksc5601.h */ |