iconvdata/cns11643l2.h

   1 /* Access functions for CNS 11643, plane 2 handling.
   2    Copyright (C) 1998, 1999, 2001, 2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
   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 #include <stdint.h>
  22 #include <gconv.h>
  23
  24 /* Table for CNS 11643, plane 2 to UCS4 conversion.  */
  25 extern const uint16_t __cns11643l2_to_ucs4_tab[];
  26
  27
  28 static inline uint32_t
  29 __attribute ((always_inline))
  30 cns11643l2_to_ucs4 (const unsigned char **s, size_t avail,
  31                     unsigned char offset)
  32 {
  33   unsigned char ch = *(*s);
  34   unsigned char ch2;
  35   int idx;
  36
  37   if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) > 0x7d)
  38     return __UNKNOWN_10646_CHAR;
  39
  40   if (avail < 2)
  41     return 0;
  42
  43   ch2 = (*s)[1];
  44   if ((ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
  45     return __UNKNOWN_10646_CHAR;
  46
  47   idx = (ch - 0x21 - offset) * 94 + (ch2 - 0x21 - offset);
  48   if (idx > 0x1de1)
  49     return __UNKNOWN_10646_CHAR;
  50
  51   (*s) += 2;
  52
  53   return __cns11643l2_to_ucs4_tab[idx] ?: ((*s) -= 2, __UNKNOWN_10646_CHAR);
  54 }
  55
  56
  57 /* The table which contains the CNS 11643 level 2 mappings.  */
  58 extern const char __cns11643_from_ucs4p0_tab[][3];
  59
  60
  61 static inline size_t
  62 __attribute ((always_inline))
  63 ucs4_to_cns11643l2 (uint32_t wch, unsigned char *s, size_t avail)
  64 {
  65   unsigned int ch = (unsigned int) wch;
  66   const char *cp = NULL;
  67
  68   if (ch >= 0x4e07 && ch <= 0x9fa4)
  69     {
  70       cp = __cns11643_from_ucs4p0_tab[ch - 0x3400];
  71       if (cp[0] == '\2')
  72         ++cp;
  73       else
  74         cp = NULL;
  75     }
  76
  77   if (cp == NULL)
  78     return __UNKNOWN_10646_CHAR;
  79
  80   if (avail < 2)
  81     return 0;
  82
  83   s[0] = cp[0];
  84   s[1] = cp[1];
  85
  86   return 2;
  87 }