iconvdata/jis0208.h

   1 /* Access functions for JISX0208 conversion.
   2    Copyright (C) 1997 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 Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef _JIS0208_H
  22 #define _JIS0208_H      1
  23
  24 #include <gconv.h>
  25 #include <inttypes.h>
  26
  27 /* Conversion table.  */
  28 extern const uint16_t jis0208_to_ucs[];
  29
  30 extern const char jisx0208_from_ucs4_lat1[256][2];
  31 extern const char jisx0208_from_ucs4_greek[0xc1][2];
  32 extern const struct jisx0208_ucs_idx jisx0208_from_ucs_idx[];
  33 extern const char jisx0208_from_ucs_tab[][2];
  34
  35
  36 /* Struct for table with indeces in UCS mapping table.  */
  37 struct jisx0208_ucs_idx
  38 {
  39   uint16_t start;
  40   uint16_t end;
  41   uint16_t idx;
  42 };
  43
  44
  45 static inline wchar_t
  46 jisx0208_to_ucs4 (char **s, size_t avail)
  47 {
  48   unsigned char ch = *(*s);
  49   unsigned char ch2;
  50   int idx;
  51
  52   if (ch <= 0x20 || ch > 0xea)
  53     return UNKNOWN_10646_CHAR;
  54
  55   if (avail < 2)
  56     return 0;
  57
  58   ch2 = (*s)[1];
  59   if (ch2 <= 0x20 || ch2 >= 0x7f)
  60     return UNKNOWN_10646_CHAR;
  61
  62   idx = (ch - 0x21) * 94 + (ch2 - 0x21);
  63   if (idx >= 0x1e80)
  64     return UNKNOWN_10646_CHAR;
  65
  66   (*s) += 2;
  67
  68   return jis0208_to_ucs[idx] ?: ((*s) -= 2, UNKNOWN_10646_CHAR);
  69 }
  70
  71
  72 static inline size_t
  73 ucs4_to_jisx0208 (wchar_t wch, char **s, size_t avail)
  74 {
  75   unsigned int ch = (unsigned int) wch;
  76   const char *cp = NULL;
  77
  78   if (avail < 2)
  79     return 0;
  80
  81   if (ch < 0x100)
  82     cp = jisx0208_from_ucs4_lat1[ch];
  83   else if (ch >= 0x391 && ch <= 0x451)
  84     cp = jisx0208_from_ucs4_greek[ch];
  85   else
  86     {
  87       const struct jisx0208_ucs_idx *rp = jisx0208_from_ucs_idx;
  88
  89       while (ch > rp->end)
  90         ++rp;
  91       if (ch >= rp->start)
  92         cp = jisx0208_from_ucs_tab[rp->idx + ch - rp->start];
  93     }
  94
  95   if (cp == NULL || cp[0] == '\0')
  96     return UNKNOWN_10646_CHAR;
  97
  98   *(*s)++ = cp[0];
  99   *(*s)++ = cp[1];
 100
 101   return 2;
 102 }
 103
 104 #endif /* jis0208.h */