iconvdata/jis0208.h

   1 /* Access functions for JISX0208 conversion.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2003 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 _JIS0208_H
  22 #define _JIS0208_H      1
  23
  24 #include <gconv.h>
  25 #include <stdint.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 uint32_t
  46 __attribute ((always_inline))
  47 jisx0208_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
  48 {
  49   unsigned char ch = *(*s);
  50   unsigned char ch2;
  51   int idx;
  52
  53   if (ch < offset || (ch - offset) <= 0x20)
  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 - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
  64   if (idx >= 0x1e80)
  65     return __UNKNOWN_10646_CHAR;
  66
  67   (*s) += 2;
  68
  69   return __jis0208_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
  70 }
  71
  72
  73 static inline size_t
  74 __attribute ((always_inline))
  75 ucs4_to_jisx0208 (uint32_t wch, char *s, size_t avail)
  76 {
  77   unsigned int ch = (unsigned int) wch;
  78   const char *cp;
  79
  80   if (avail < 2)
  81     return 0;
  82
  83   if (ch < 0x100)
  84     cp = __jisx0208_from_ucs4_lat1[ch];
  85   else if (ch >= 0x391 && ch <= 0x451)
  86     cp = __jisx0208_from_ucs4_greek[ch - 0x391];
  87   else
  88     {
  89       const struct jisx0208_ucs_idx *rp = __jisx0208_from_ucs_idx;
  90
  91       if (ch >= 0xffff)
  92         return __UNKNOWN_10646_CHAR;
  93       while (ch > rp->end)
  94         ++rp;
  95       if (ch >= rp->start)
  96         cp = __jisx0208_from_ucs_tab[rp->idx + ch - rp->start];
  97       else
  98         return __UNKNOWN_10646_CHAR;
  99     }
 100
 101   if (cp[0] == '\0')
 102     return __UNKNOWN_10646_CHAR;
 103
 104   s[0] = cp[0];
 105   s[1] = cp[1];
 106
 107   return 2;
 108 }
 109
 110 #endif /* jis0208.h */