iconvdata/gbgbk.c

   1 /* Mapping tables from GBK to GB2312 and vice versa.
   2    Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <gconv.h>
  22 #include <stdint.h>
  23
  24
  25 /* Definitions used in the body of the `gconv' function.  */
  26 #define CHARSET_NAME            "GBK//"
  27 #define FROM_LOOP               from_gbk_to_gb
  28 #define TO_LOOP                 from_gb_to_gbk
  29 #define DEFINE_INIT             1
  30 #define DEFINE_FINI             1
  31 #define MIN_NEEDED_FROM         1
  32 #define MAX_NEEDED_FROM         2
  33 #define MIN_NEEDED_TO           1
  34 #define MAX_NEEDED_TO           2
  35
  36
  37 /* First define the conversion function from GBK to GB2312.  */
  38 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
  39 #define MAX_NEEDED_INPUT        MAX_NEEDED_FROM
  40 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
  41 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_TO
  42 #define LOOPFCT                 FROM_LOOP
  43 #define BODY \
  44   {                                                                           \
  45     uint32_t ch = *inptr;                                                     \
  46                                                                               \
  47     if (ch <= 0x7f)                                                           \
  48       *outptr++ = *inptr++;                                                   \
  49     else                                                                      \
  50       {                                                                       \
  51         /* It's a two-byte sequence.  We have to mask out all the sequences   \
  52            which are not in GB2312.  Besides all of them in the range         \
  53            0x8140 to 0xA0FE this also includes in the remaining range the     \
  54            sequences which the second byte being in the range from 0x40 to    \
  55            0xA0 and the following exceptions:                                 \
  56                                                                               \
  57              0xA2A1 to 0xA2A9,                                                \
  58              0xA2AA,                                                          \
  59              0xA6E0 to 0xA6EB,                                                \
  60              0xA6EE to 0xA6F2,                                                \
  61              0xA6F4, 0xA6F5,                                                  \
  62              0xA8BB to 0xA8C0                                                 \
  63                                                                               \
  64            All these characters are not defined in GB2312.  Besides this      \
  65            there is an incomatibility in the mapping.  The Unicode tables     \
  66            say that 0xA1A4 maps in GB2312 to U30FB while in GBK it maps to    \
  67            U00B7.  Since we are free to do whatever we want if a mapping      \
  68            is not available we will not flag this as an error but instead     \
  69            map the two positions.  But this means that the mapping            \
  70                                                                               \
  71                 UCS4 -> GB2312 -> GBK -> UCS4                                 \
  72                                                                               \
  73            might not produce identical text.  */                              \
  74         if (NEED_LENGTH_TEST && inptr + 1 >= inend)                           \
  75           {                                                                   \
  76             /* The second character is not available.  Store                  \
  77                the intermediate result.  */                                   \
  78             result = __GCONV_INCOMPLETE_INPUT;                                \
  79             break;                                                            \
  80           }                                                                   \
  81                                                                               \
  82         if (NEED_LENGTH_TEST && outend - outptr < 2)                          \
  83           {                                                                   \
  84             /* We ran out of space.  */                                       \
  85             result = __GCONV_FULL_OUTPUT;                                     \
  86             break;                                                            \
  87           }                                                                   \
  88                                                                               \
  89         ch = (ch << 8) | inptr[1];                                            \
  90                                                                               \
  91         /* Now determine whether the character is valid.  */                  \
  92         if (ch >= 0xa1a1 && ch <= 0xf7fe && inptr[1] >= 0xa1)                 \
  93           {                                                                   \
  94             /* So far so good.  Now test the exceptions.  */                  \
  95             if ((ch >= 0xa2a1 && ch <= 0xa2aa)                                \
  96                 || (ch >= 0xa6e0 && ch <= 0xa6f5)                             \
  97                 || (ch >= 0xa8bb && ch <= 0xa8c0))                            \
  98               {                                                               \
  99                 /* One of the exceptions.  */                                 \
 100                 result = __GCONV_ILLEGAL_INPUT;                               \
 101                 break;                                                        \
 102               }                                                               \
 103           }                                                                   \
 104         else                                                                  \
 105           {                                                                   \
 106             /* One of the characters we cannot map.  */                       \
 107             result = __GCONV_ILLEGAL_INPUT;                                   \
 108             break;                                                            \
 109           }                                                                   \
 110                                                                               \
 111         /* Copy the two bytes.  */                                            \
 112         *outptr++ = *inptr++;                                                 \
 113         *outptr++ = *inptr++;                                                 \
 114       }                                                                       \
 115   }
 116 #include <iconv/loop.c>
 117
 118
 119 /* Next, define the other direction.  */
 120 #define MIN_NEEDED_INPUT        MIN_NEEDED_TO
 121 #define MAX_NEEDED_INPUT        MAX_NEEDED_TO
 122 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_FROM
 123 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_FROM
 124 #define LOOPFCT                 TO_LOOP
 125 #define BODY \
 126   {                                                                           \
 127     /* We don't have to care about characters we cannot map.  The only        \
 128        problem is the mapping of 0xA1A4 but as explained above we do not      \
 129        do anything special here.  */                                          \
 130     unsigned char ch = *inptr++;                                              \
 131                                                                               \
 132     if (ch > 0x7f)                                                            \
 133       {                                                                       \
 134         if (NEED_LENGTH_TEST && inptr + 1 >= inend)                           \
 135           {                                                                   \
 136             /* The second character is not available.  Store                  \
 137                  the intermediate result.  */                                 \
 138             result = __GCONV_INCOMPLETE_INPUT;                                \
 139             break;                                                            \
 140           }                                                                   \
 141                                                                               \
 142         if (NEED_LENGTH_TEST && outend - outptr < 2)                          \
 143           {                                                                   \
 144             /* We ran out of space.  */                                       \
 145             result = __GCONV_FULL_OUTPUT;                                     \
 146             break;                                                            \
 147           }                                                                   \
 148                                                                               \
 149         *outptr++ = ch;                                                       \
 150         ch = *inptr++;                                                        \
 151       }                                                                       \
 152     *outptr++ = ch;                                                           \
 153   }
 154 #include <iconv/loop.c>
 155
 156
 157 /* Now define the toplevel functions.  */
 158 #include <iconv/skeleton.c>