iconvdata/ksc5601.h

   1 /* Access functions for KS C 5601-1992 based encoding conversion.
   2    Copyright (C) 1998-2022 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    <https://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   if (avail < 2)
  54     return 0;
  55
  56   /* row 94(0x7e) and row 41(0x49) are user-defined area in KS C 5601 */
  57
  58   if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) >= 0x7e
  59       || (ch - offset) == 0x49)
  60     return __UNKNOWN_10646_CHAR;
  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 */