iconvdata/jis0212.h

   1 /* Access functions for JISX0212 conversion.
   2    Copyright (C) 1997-2024 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 _JIS0212_H
  20 #define _JIS0212_H      1
  21
  22 #include <assert.h>
  23 #include <gconv.h>
  24 #include <stdint.h>
  25
  26
  27 /* Struct for table with indices in mapping table.  */
  28 struct jisx0212_idx
  29 {
  30   uint16_t start;
  31   uint16_t end;
  32   uint16_t idx;
  33 };
  34
  35 /* Conversion table.  */
  36 extern const struct jisx0212_idx __jisx0212_to_ucs_idx[];
  37 extern const uint16_t __jisx0212_to_ucs[];
  38
  39 extern const struct jisx0212_idx __jisx0212_from_ucs_idx[];
  40 extern const char __jisx0212_from_ucs[][2];
  41
  42
  43 static inline uint32_t
  44 __attribute ((always_inline))
  45 jisx0212_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
  46 {
  47   const struct jisx0212_idx *rp = __jisx0212_to_ucs_idx;
  48   unsigned char ch = *(*s);
  49   unsigned char ch2;
  50   uint32_t wch = 0;
  51   int idx;
  52
  53   if (ch < offset || (ch - offset) < 0x22 || (ch - offset) > 0x6d)
  54     return __UNKNOWN_10646_CHAR;
  55
  56   if (avail < 2)
  57     return 0;
  58
  59   ch2 = (*s)[1];
  60   if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
  61     return __UNKNOWN_10646_CHAR;
  62
  63   idx = (ch - offset - 0x21) * 94 + (ch2 - offset - 0x21);
  64
  65   while (idx > rp->end)
  66     ++rp;
  67   if (idx >= rp->start)
  68     wch = __jisx0212_to_ucs[rp->idx + idx - rp->start];
  69
  70   if (wch != L'\0')
  71     (*s) += 2;
  72   else
  73     wch = __UNKNOWN_10646_CHAR;
  74
  75   return wch;
  76 }
  77
  78
  79 static inline size_t
  80 __attribute ((always_inline))
  81 ucs4_to_jisx0212 (uint32_t wch, unsigned char *s, size_t avail)
  82 {
  83   const struct jisx0212_idx *rp = __jisx0212_from_ucs_idx;
  84   unsigned int ch = (unsigned int) wch;
  85   const char *cp;
  86
  87   if (ch >= 0xffff)
  88     return __UNKNOWN_10646_CHAR;
  89   while (ch > rp->end)
  90     ++rp;
  91   if (ch >= rp->start)
  92     cp = __jisx0212_from_ucs[rp->idx + ch - rp->start];
  93   else
  94     return __UNKNOWN_10646_CHAR;
  95
  96   if (cp[0] == '\0')
  97     return __UNKNOWN_10646_CHAR;
  98
  99   s[0] = cp[0];
 100   assert (cp[1] != '\0');
 101   if (avail < 2)
 102     return 0;
 103
 104   s[1] = cp[1];
 105   return 2;
 106 }
 107
 108 #endif /* jis0212.h */