1/* Mapping tables from GBK to GB2312 and vice versa.
2 Copyright (C) 1999-2021 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 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, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <dlfcn.h>
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#define ONE_DIRECTION 0
36
37
38/* First define the conversion function from GBK to GB2312. */
39#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
40#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
41#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
42#define MAX_NEEDED_OUTPUT MAX_NEEDED_TO
43#define LOOPFCT FROM_LOOP
44#define BODY \
45 { \
46 uint32_t ch = *inptr; \
47 \
48 if (ch <= 0x7f) \
49 *outptr++ = *inptr++; \
50 else \
51 { \
52 /* It's a two-byte sequence. We have to mask out all the sequences \
53 which are not in GB2312. Besides all of them in the range \
54 0x8140 to 0xA0FE this also includes in the remaining range the \
55 sequences which the second byte being in the range from 0x40 to \
56 0xA0 and the following exceptions: \
57 \
58 0xA2A1 to 0xA2A9, \
59 0xA2AA, \
60 0xA6E0 to 0xA6EB, \
61 0xA6EE to 0xA6F2, \
62 0xA6F4, 0xA6F5, \
63 0xA8BB to 0xA8C0 \
64 \
65 All these characters are not defined in GB2312. Besides this \
66 there is an incomatibility in the mapping. The Unicode tables \
67 say that 0xA1A4 maps in GB2312 to U30FB while in GBK it maps to \
68 U00B7. Similarly, 0xA1AA maps in GB2312 to U2015 while in GBK \
69 it maps to U2014. Since we are free to do whatever we want if \
70 a mapping is not available we will not flag this as an error \
71 but instead map the two positions. But this means that the \
72 mapping \
73 \
74 UCS4 -> GB2312 -> GBK -> UCS4 \
75 \
76 might not produce identical text. */ \
77 if (__glibc_unlikely (inptr + 1 >= inend)) \
78 { \
79 /* The second character is not available. Store \
80 the intermediate result. */ \
81 result = __GCONV_INCOMPLETE_INPUT; \
82 break; \
83 } \
84 \
85 if (__glibc_unlikely (outend - outptr < 2)) \
86 { \
87 /* We ran out of space. */ \
88 result = __GCONV_FULL_OUTPUT; \
89 break; \
90 } \
91 \
92 ch = (ch << 8) | inptr[1]; \
93 \
94 /* Map 0xA844 (U2015 in GBK) to 0xA1AA (U2015 in GB2312). */ \
95 if (__glibc_unlikely (ch == 0xa844)) \
96 ch = 0xa1aa; \
97 \
98 /* Now determine whether the character is valid. */ \
99 if (__builtin_expect (ch < 0xa1a1, 0) \
100 || __builtin_expect (ch > 0xf7fe, 0) \
101 || __builtin_expect (inptr[1] < 0xa1, 0) \
102 /* Now test the exceptions. */ \
103 || (__builtin_expect (ch >= 0xa2a1, 0) \
104 && __builtin_expect (ch <= 0xa2aa, 0)) \
105 || (__builtin_expect (ch >= 0xa6e0, 0) \
106 && __builtin_expect (ch <= 0xa6f5, 0)) \
107 || (__builtin_expect (ch >= 0xa8bb, 0) \
108 && __builtin_expect (ch <= 0xa8c0, 0))) \
109 { \
110 /* One of the characters we cannot map. */ \
111 STANDARD_TO_LOOP_ERR_HANDLER (2); \
112 } \
113 \
114 /* Copy the two bytes. */ \
115 *outptr++ = *inptr++; \
116 *outptr++ = *inptr++; \
117 } \
118 }
119#define LOOP_NEED_FLAGS
120#include <iconv/loop.c>
121
122
123/* Next, define the other direction. */
124#define MIN_NEEDED_INPUT MIN_NEEDED_TO
125#define MAX_NEEDED_INPUT MAX_NEEDED_TO
126#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
127#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
128#define LOOPFCT TO_LOOP
129#define BODY \
130 { \
131 /* We don't have to care about characters we cannot map. The only \
132 problem are the mapping of 0xA1A4 and 0xA1AA but as explained above \
133 we do not do anything special here. */ \
134 unsigned char ch = *inptr++; \
135 \
136 if (ch > 0x7f) \
137 { \
138 if (__glibc_unlikely (inptr + 1 >= inend)) \
139 { \
140 /* The second character is not available. Store \
141 the intermediate result. */ \
142 result = __GCONV_INCOMPLETE_INPUT; \
143 break; \
144 } \
145 \
146 if (__glibc_unlikely (outend - outptr < 2)) \
147 { \
148 /* We ran out of space. */ \
149 result = __GCONV_FULL_OUTPUT; \
150 break; \
151 } \
152 \
153 *outptr++ = ch; \
154 ch = *inptr++; \
155 } \
156 *outptr++ = ch; \
157 }
158#include <iconv/loop.c>
159
160
161/* Now define the toplevel functions. */
162#include <iconv/skeleton.c>
163