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, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef _JIS0208_H
  22 #define _JIS0208_H      1
  23
  24 #include <gconv.h>
  25 #include <stdint.h>
  26
  27 /* Struct for table with indeces in UCS mapping table.  */
  28 struct jisx0208_ucs_idx
  29 {
  30   uint16_t start;
  31   uint16_t end;
  32   uint16_t idx;
  33 };
  34
  35
  36 /* Conversion table.  */
  37 extern const uint16_t __jis0208_to_ucs[];
  38
  39 #define JIS0208_LAT1_MIN 0xa2
  40 #define JIS0208_LAT1_MAX 0xf7
  41 extern const char __jisx0208_from_ucs4_lat1[JIS0208_LAT1_MAX + 1
  42                                             - JIS0208_LAT1_MIN][2];
  43 extern const char __jisx0208_from_ucs4_greek[0xc1][2];
  44 extern const struct jisx0208_ucs_idx __jisx0208_from_ucs_idx[];
  45 extern const char __jisx0208_from_ucs_tab[][2];
  46
  47
  48 static inline uint32_t
  49 __attribute ((always_inline))
  50 jisx0208_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
  51 {
  52   unsigned char ch = *(*s);
  53   unsigned char ch2;
  54   int idx;
  55
  56   if (ch < offset || (ch - offset) <= 0x20)
  57     return __UNKNOWN_10646_CHAR;
  58
  59   if (avail < 2)
  60     return 0;
  61
  62   ch2 = (*s)[1];
  63   if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
  64     return __UNKNOWN_10646_CHAR;
  65
  66   idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
  67   if (idx >= 0x1e80)
  68     return __UNKNOWN_10646_CHAR;
  69
  70   (*s) += 2;
  71
  72   return __jis0208_to_ucs[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
  73 }
  74
  75
  76 static inline size_t
  77 __attribute ((always_inline))
  78 ucs4_to_jisx0208 (uint32_t wch, unsigned char *s, size_t avail)
  79 {
  80   unsigned int ch = (unsigned int) wch;
  81   const char *cp;
  82
  83   if (avail < 2)
  84     return 0;
  85
  86   if (ch >= JIS0208_LAT1_MIN && ch <= JIS0208_LAT1_MAX)
  87     cp = __jisx0208_from_ucs4_lat1[ch - JIS0208_LAT1_MIN];
  88   else if (ch >= 0x391 && ch <= 0x451)
  89     cp = __jisx0208_from_ucs4_greek[ch - 0x391];
  90   else
  91     {
  92       const struct jisx0208_ucs_idx *rp = __jisx0208_from_ucs_idx;
  93
  94       if (ch >= 0xffff)
  95         return __UNKNOWN_10646_CHAR;
  96       while (ch > rp->end)
  97         ++rp;
  98       if (ch >= rp->start)
  99         cp = __jisx0208_from_ucs_tab[rp->idx + ch - rp->start];
 100       else
 101         return __UNKNOWN_10646_CHAR;
 102     }
 103
 104   if (cp[0] == '\0')
 105     return __UNKNOWN_10646_CHAR;
 106
 107   s[0] = cp[0];
 108   s[1] = cp[1];
 109
 110   return 2;
 111 }
 112
 113 #endif /* jis0208.h */