iconvdata/jisx0213.h

   1 /* Functions for JISX0213 conversion.
   2    Copyright (C) 2002-2023 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 _JISX0213_H
  20 #define _JISX0213_H     1
  21
  22 #include <stdint.h>
  23
  24 extern const uint16_t __jisx0213_to_ucs_combining[][2];
  25 extern const uint16_t __jisx0213_to_ucs_main[120 * 94];
  26 extern const uint32_t __jisx0213_to_ucs_pagestart[];
  27 extern const int16_t __jisx0213_from_ucs_level1[2715];
  28 extern const uint16_t __jisx0213_from_ucs_level2[];
  29
  30 #define NELEMS(arr) (sizeof (arr) / sizeof (arr[0]))
  31
  32 static inline uint32_t
  33 __attribute ((always_inline))
  34 jisx0213_to_ucs4 (unsigned int row, unsigned int col)
  35 {
  36   uint32_t val;
  37
  38   if (row >= 0x121 && row <= 0x17e)
  39     row -= 289;
  40   else if (row == 0x221)
  41     row -= 451;
  42   else if (row >= 0x223 && row <= 0x225)
  43     row -= 452;
  44   else if (row == 0x228)
  45     row -= 454;
  46   else if (row >= 0x22c && row <= 0x22f)
  47     row -= 457;
  48   else if (row >= 0x26e && row <= 0x27e)
  49     row -= 519;
  50   else
  51     return 0x0000;
  52
  53   if (col >= 0x21 && col <= 0x7e)
  54     col -= 0x21;
  55   else
  56     return 0x0000;
  57
  58   val = __jisx0213_to_ucs_main[row * 94 + col];
  59   val = __jisx0213_to_ucs_pagestart[val >> 8] + (val & 0xff);
  60   if (val == 0xfffd)
  61     val = 0x0000;
  62   return val;
  63 }
  64
  65 static inline uint16_t
  66 __attribute ((always_inline))
  67 ucs4_to_jisx0213 (uint32_t ucs)
  68 {
  69   if (ucs < NELEMS (__jisx0213_from_ucs_level1) << 6)
  70     {
  71       int index1 = __jisx0213_from_ucs_level1[ucs >> 6];
  72       if (index1 >= 0)
  73         return __jisx0213_from_ucs_level2[(index1 << 6) + (ucs & 0x3f)];
  74     }
  75   return 0x0000;
  76 }
  77
  78 static inline int
  79 __attribute ((always_inline))
  80 jisx0213_added_in_2004_p (uint16_t val)
  81 {
  82   /* From JISX 0213:2000 to JISX 0213:2004, 10 characters were added to
  83      plane 1, and plane 2 was left unchanged.  See ISO-IR-233.  */
  84   switch (val >> 8)
  85     {
  86     case 0x2e:
  87       return val == 0x2e21;
  88     case 0x2f:
  89       return val == 0x2f7e;
  90     case 0x4f:
  91       return val == 0x4f54 || val == 0x4f7e;
  92     case 0x74:
  93       return val == 0x7427;
  94     case 0x7e:
  95       return val >= 0x7e7a && val <= 0x7e7e;
  96     default:
  97       return 0;
  98     }
  99 }
 100
 101 #endif /* _JISX0213_H */