iconvdata/jis0212.h

   1 /* Access functions for JISX0212 conversion.
   2    Copyright (C) 1997-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _JIS0212_H
  21 #define _JIS0212_H      1
  22
  23 #include <assert.h>
  24 #include <gconv.h>
  25 #include <stdint.h>
  26
  27
  28 /* Struct for table with indeces in mapping table.  */
  29 struct jisx0212_idx
  30 {
  31   uint16_t start;
  32   uint16_t end;
  33   uint16_t idx;
  34 };
  35
  36 /* Conversion table.  */
  37 extern const struct jisx0212_idx __jisx0212_to_ucs_idx[];
  38 extern const uint16_t __jisx0212_to_ucs[];
  39
  40 extern const struct jisx0212_idx __jisx0212_from_ucs_idx[];
  41 extern const char __jisx0212_from_ucs[][2];
  42
  43
  44 static inline uint32_t
  45 __attribute ((always_inline))
  46 jisx0212_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
  47 {
  48   const struct jisx0212_idx *rp = __jisx0212_to_ucs_idx;
  49   unsigned char ch = *(*s);
  50   unsigned char ch2;
  51   uint32_t wch = 0;
  52   int idx;
  53
  54   if (ch < offset || (ch - offset) < 0x22 || (ch - offset) > 0x6d)
  55     return __UNKNOWN_10646_CHAR;
  56
  57   if (avail < 2)
  58     return 0;
  59
  60   ch2 = (*s)[1];
  61   if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
  62     return __UNKNOWN_10646_CHAR;
  63
  64   idx = (ch - offset - 0x21) * 94 + (ch2 - offset - 0x21);
  65
  66   while (idx > rp->end)
  67     ++rp;
  68   if (idx >= rp->start)
  69     wch = __jisx0212_to_ucs[rp->idx + idx - rp->start];
  70
  71   if (wch != L'\0')
  72     (*s) += 2;
  73   else
  74     wch = __UNKNOWN_10646_CHAR;
  75
  76   return wch;
  77 }
  78
  79
  80 static inline size_t
  81 __attribute ((always_inline))
  82 ucs4_to_jisx0212 (uint32_t wch, unsigned char *s, size_t avail)
  83 {
  84   const struct jisx0212_idx *rp = __jisx0212_from_ucs_idx;
  85   unsigned int ch = (unsigned int) wch;
  86   const char *cp;
  87
  88   if (ch >= 0xffff)
  89     return __UNKNOWN_10646_CHAR;
  90   while (ch > rp->end)
  91     ++rp;
  92   if (ch >= rp->start)
  93     cp = __jisx0212_from_ucs[rp->idx + ch - rp->start];
  94   else
  95     return __UNKNOWN_10646_CHAR;
  96
  97   if (cp[0] == '\0')
  98     return __UNKNOWN_10646_CHAR;
  99
 100   s[0] = cp[0];
 101   assert (cp[1] != '\0');
 102   if (avail < 2)
 103     return 0;
 104
 105   s[1] = cp[1];
 106   return 2;
 107 }
 108
 109 #endif /* jis0212.h */