iconvdata/jis0212.h

   1 /* Access functions for JISX0212 conversion.
   2    Copyright (C) 1997, 1998, 1999 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _JIS0212_H
  22 #define _JIS0212_H      1
  23
  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 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 ucs4_to_jisx0212 (uint32_t wch, char *s, size_t avail)
  81 {
  82   const struct jisx0212_idx *rp = __jisx0212_from_ucs_idx;
  83   unsigned int ch = (unsigned int) wch;
  84   const char *cp;
  85
  86   if (ch >= 0xffff)
  87     return __UNKNOWN_10646_CHAR;
  88   while (ch > rp->end)
  89     ++rp;
  90   if (ch >= rp->start)
  91     cp = __jisx0212_from_ucs[rp->idx + ch - rp->start];
  92   else
  93     return __UNKNOWN_10646_CHAR;
  94
  95   if (cp[0] == '\0')
  96     return __UNKNOWN_10646_CHAR;
  97
  98   s[0] = cp[0];
  99   if (cp[1] != '\0')
 100     {
 101       if (avail < 2)
 102         return 0;
 103
 104       s[1] = cp[1];
 105     }
 106
 107   return 2;
 108 }
 109
 110 #endif /* jis0212.h */