iconvdata/iso-ir-165.h

   1 /* Tables for conversion to and from ISO-IR-165.
   2    converting from UCS using gaps.
   3    Copyright (C) 2000 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    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    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef _ISO_IR_165_H
  23 #define _ISO_IR_165_H   1
  24
  25 #include <gconv.h>
  26 #include <stdint.h>
  27
  28 struct gap
  29 {
  30   uint16_t start;
  31   uint16_t end;
  32   int32_t idx;
  33 };
  34
  35 /* Table for ISO-IR-165 (CCITT Chinese) to UCS4 conversion.  */
  36 #define ISOIR165_FROMSIZE       0x2284
  37 extern const uint16_t __isoir165_to_tab[ISOIR165_FROMSIZE];
  38
  39
  40 /* XXX If we at some point need an offset value to decode the byte
  41    sequences another parameter can be added.  */
  42 static inline uint32_t
  43 ucs4_from_isoir165 (const char **s, size_t avail)
  44 {
  45   unsigned char ch = *(*s);
  46   unsigned char ch2;
  47
  48   if (ch <= 0x20 || ch >= 0x7f)
  49     return __UNKNOWN_10646_CHAR;
  50
  51   if (avail < 2)
  52     return 0;
  53
  54   ch2 = (*s)[1];
  55   if (ch2 <= 0x20 || ch2 >= 0x7f)
  56     return __UNKNOWN_10646_CHAR;
  57
  58   return (__isoir165_to_tab[(ch - 0x21) * 94 + (ch2 - 0x21)]
  59           ?: __UNKNOWN_10646_CHAR);
  60 }
  61
  62
  63 /* Tables for ISO-IR-165 (CCITT Chinese) from UCS4 conversion.  */
  64 extern const struct gap __isoir165_from_idx[];
  65 extern const char __isoir165_from_tab[];
  66
  67 static inline size_t
  68 ucs4_to_isoir165 (uint32_t wch, char *s, size_t avail)
  69 {
  70   unsigned int ch = (unsigned int) wch;
  71   const char *cp;
  72   const struct gap *rp = __isoir165_from_idx;
  73
  74   if (ch > 0xffe5)
  75     /* This is an illegal character.  */
  76     return __UNKNOWN_10646_CHAR;
  77
  78   while (ch > rp->end)
  79     ++rp;
  80   if (ch < rp->start)
  81     /* This is an illegal character.  */
  82     return __UNKNOWN_10646_CHAR;
  83
  84   /* The two bytes following the index given in this record give the
  85      encoding in ISO-IR-165.  Unless the bytes are zero.  */
  86   cp = &__isoir165_from_tab[(ch + rp->idx) * 2];
  87   if (*cp == '\0')
  88     /* This is an illegal character.  */
  89     return __UNKNOWN_10646_CHAR;
  90
  91   if (avail < 2)
  92     return 0;
  93
  94   s[0] = cp[0];
  95   s[1] = cp[1];
  96
  97   return 2;
  98 }
  99
 100 #endif  /* iso-ir-165.h */