summary refs log tree commit diff
path: root/iconvdata/gbgbk.c
blob: 9a3e385cbafdb1f54a6f5f0f6ab6b79c05d0adeb (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/* Mapping tables from GBK to GB2312 and vice versa.
   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <gconv.h>
#include <stdint.h>


/* Definitions used in the body of the `gconv' function.  */
#define CHARSET_NAME		"GBK//"
#define FROM_LOOP		from_gbk_to_gb
#define TO_LOOP			from_gb_to_gbk
#define DEFINE_INIT		1
#define DEFINE_FINI		1
#define MIN_NEEDED_FROM		1
#define MAX_NEEDED_FROM		2
#define MIN_NEEDED_TO		1
#define MAX_NEEDED_TO		2


/* First define the conversion function from GBK to GB2312.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT	MAX_NEEDED_TO
#define LOOPFCT			FROM_LOOP
#define BODY \
  {									      \
    uint32_t ch = *inptr;						      \
									      \
    if (ch <= 0x7f)							      \
      *outptr++ = *inptr++;						      \
    else								      \
      {									      \
	/* It's a two-byte sequence.  We have to mask out all the sequences   \
	   which are not in GB2312.  Besides all of them in the range	      \
	   0x8140 to 0xA0FE this also includes in the remaining range the     \
	   sequences which the second byte being in the range from 0x40 to    \
	   0xA0 and the following exceptions:				      \
									      \
	     0xA2A1 to 0xA2A9,						      \
	     0xA2AA,							      \
	     0xA6E0 to 0xA6EB,						      \
	     0xA6EE to 0xA6F2,						      \
	     0xA6F4, 0xA6F5,						      \
	     0xA8BB to 0xA8C0						      \
									      \
	   All these characters are not defined in GB2312.  Besides this      \
	   there is an incomatibility in the mapping.  The Unicode tables     \
	   say that 0xA1A4 maps in GB2312 to U30FB while in GBK it maps to    \
	   U00B7.  Since we are free to do whatever we want if a mapping      \
	   is not available we will not flag this as an error but instead     \
	   map the two positions.  But this means that the mapping	      \
									      \
		UCS4 -> GB2312 -> GBK -> UCS4				      \
									      \
	   might not produce identical text.  */			      \
	if (NEED_LENGTH_TEST && __builtin_expect (inptr + 1 >= inend, 0))     \
	  {								      \
	    /* The second character is not available.  Store		      \
	       the intermediate result.  */				      \
	    result = __GCONV_INCOMPLETE_INPUT;				      \
	    break;							      \
	  }								      \
									      \
	if (NEED_LENGTH_TEST && __builtin_expect (outend - outptr < 2, 0))    \
	  {								      \
	    /* We ran out of space.  */					      \
	    result = __GCONV_FULL_OUTPUT;				      \
	    break;							      \
	  }								      \
									      \
	ch = (ch << 8) | inptr[1];					      \
									      \
	/* Now determine whether the character is valid.  */		      \
	if (__builtin_expect (ch, 0xa1a1) < 0xa1a1			      \
	    || __builtin_expect (ch, 0xa1a1) > 0xf7fe			      \
	    || __builtin_expect (inptr[1], 0xa1) < 0xa1			      \
	    /* Now test the exceptions.  */				      \
	    || (__builtin_expect (ch, 0xa1a1) >= 0xa2a1			      \
		&& __builtin_expect (ch, 0xa1a1) <= 0xa2aa)		      \
	    || (__builtin_expect (ch, 0xa1a1) >= 0xa6e0			      \
		&& __builtin_expect (ch, 0xa1a1) <= 0xa6f5)		      \
	    || (__builtin_expect (ch, 0xa1a1) >= 0xa8bb			      \
		&& __builtin_expect (ch, 0xa1a1) <= 0xa8c0))		      \
	  {								      \
	    /* One of the characters we cannot map.  */			      \
	    if (! ignore_errors_p ())					      \
	      {								      \
		result = __GCONV_ILLEGAL_INPUT;				      \
		break;							      \
	      }								      \
									      \
	    inptr += 2;							      \
	    ++*converted;						      \
	  }								      \
	else								      \
	  {								      \
	    /* Copy the two bytes.  */					      \
	    *outptr++ = *inptr++;					      \
	    *outptr++ = *inptr++;					      \
	  }								      \
      }									      \
  }
#include <iconv/loop.c>


/* Next, define the other direction.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_TO
#define MAX_NEEDED_INPUT	MAX_NEEDED_TO
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
#define MAX_NEEDED_OUTPUT	MAX_NEEDED_FROM
#define LOOPFCT			TO_LOOP
#define BODY \
  {									      \
    /* We don't have to care about characters we cannot map.  The only	      \
       problem is the mapping of 0xA1A4 but as explained above we do not      \
       do anything special here.  */					      \
    unsigned char ch = *inptr++;					      \
									      \
    if (ch > 0x7f)							      \
      {									      \
	if (NEED_LENGTH_TEST && __builtin_expect (inptr + 1 >= inend, 0))     \
	  {								      \
	    /* The second character is not available.  Store		      \
		 the intermediate result.  */				      \
	    result = __GCONV_INCOMPLETE_INPUT;				      \
	    break;							      \
	  }								      \
									      \
	if (NEED_LENGTH_TEST && __builtin_expect (outend - outptr < 2, 0))    \
	  {								      \
	    /* We ran out of space.  */					      \
	    result = __GCONV_FULL_OUTPUT;				      \
	    break;							      \
	  }								      \
									      \
	*outptr++ = ch;							      \
	ch = *inptr++;							      \
      }									      \
    *outptr++ = ch;							      \
  }
#include <iconv/loop.c>


/* Now define the toplevel functions.  */
#include <iconv/skeleton.c>