iconvdata/jis0208.h

   1 /* Access functions for JISX0208 conversion.
   2    Copyright (C) 1997,1998,1999,2000,2003,2005,2007
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #ifndef _JIS0208_H
  23 #define _JIS0208_H      1
  24
  25 #include <gconv.h>
  26 #include <stdint.h>
  27
  28 /* Struct for table with indeces in UCS mapping table.  */
  29 struct jisx0208_ucs_idx
  30 {
  31   uint16_t start;
  32   uint16_t end;
  33   uint16_t idx;
  34 };
  35
  36
  37 /* Conversion table.  */
  38 extern const uint16_t __jis0208_to_ucs[];
  39
  40 #define JIS0208_LAT1_MIN 0xa2
  41 #define JIS0208_LAT1_MAX 0xf7
  42 extern const char __jisx0208_from_ucs4_lat1[JIS0208_LAT1_MAX + 1
  43                                             - JIS0208_LAT1_MIN][2];
  44 extern const char __jisx0208_from_ucs4_greek[0xc1][2];
  45 extern const struct jisx0208_ucs_idx __jisx0208_from_ucs_idx[];
  46 extern const char __jisx0208_from_ucs_tab[][2];
  47
  48
  49 static inline uint32_t
  50 __attribute ((always_inline))
  51 jisx0208_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
  52 {
  53   unsigned char ch = *(*s);
  54   unsigned char ch2;
  55   int idx;
  56
  57   if (ch < offset || (ch - offset) <= 0x20)
  58     return __UNKNOWN_10646_CHAR;
  59
  60   if (avail < 2)
  61     return 0;
  62
  63   ch2 = (*s)[1];
  64   if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
  65     return __UNKNOWN_10646_CHAR;
  66
  67   idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
  68   if (idx >= 0x1e80)
  69     return __UNKNOWN_10646_CHAR;
  70
  71   (*s) += 2;
  72
  73   return __jis0208_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
  74 }
  75
  76
  77 static inline size_t
  78 __attribute ((always_inline))
  79 ucs4_to_jisx0208 (uint32_t wch, unsigned char *s, size_t avail)
  80 {
  81   unsigned int ch = (unsigned int) wch;
  82   const char *cp;
  83
  84   if (avail < 2)
  85     return 0;
  86
  87   if (ch >= JIS0208_LAT1_MIN && ch <= JIS0208_LAT1_MAX)
  88     cp = __jisx0208_from_ucs4_lat1[ch - JIS0208_LAT1_MIN];
  89   else if (ch >= 0x391 && ch <= 0x451)
  90     cp = __jisx0208_from_ucs4_greek[ch - 0x391];
  91   else
  92     {
  93       const struct jisx0208_ucs_idx *rp = __jisx0208_from_ucs_idx;
  94
  95       if (ch >= 0xffff)
  96         return __UNKNOWN_10646_CHAR;
  97       while (ch > rp->end)
  98         ++rp;
  99       if (ch >= rp->start)
 100         cp = __jisx0208_from_ucs_tab[rp->idx + ch - rp->start];
 101       else
 102         return __UNKNOWN_10646_CHAR;
 103     }
 104
 105   if (cp[0] == '\0')
 106     return __UNKNOWN_10646_CHAR;
 107
 108   s[0] = cp[0];
 109   s[1] = cp[1];
 110
 111   return 2;
 112 }
 113
 114 #endif /* jis0208.h */