1 | /* |
2 | * linux/fs/nls/nls_koi8-ru.c |
3 | * |
4 | * Charset koi8-ru translation based on charset koi8-u. |
5 | * The Unicode to charset table has only exact mappings. |
6 | */ |
7 | |
8 | #include <linux/module.h> |
9 | #include <linux/kernel.h> |
10 | #include <linux/string.h> |
11 | #include <linux/nls.h> |
12 | #include <linux/errno.h> |
13 | |
14 | static struct nls_table *p_nls; |
15 | |
16 | static int uni2char(const wchar_t uni, |
17 | unsigned char *out, int boundlen) |
18 | { |
19 | if (boundlen <= 0) |
20 | return -ENAMETOOLONG; |
21 | |
22 | if ((uni & 0xffaf) == 0x040e || (uni & 0xffce) == 0x254c) { |
23 | /* koi8-ru and koi8-u differ only on two characters */ |
24 | if (uni == 0x040e) |
25 | out[0] = 0xbe; |
26 | else if (uni == 0x045e) |
27 | out[0] = 0xae; |
28 | else if (uni == 0x255d || uni == 0x256c) |
29 | return 0; |
30 | else |
31 | return p_nls->uni2char(uni, out, boundlen); |
32 | return 1; |
33 | } |
34 | else |
35 | /* fast path */ |
36 | return p_nls->uni2char(uni, out, boundlen); |
37 | } |
38 | |
39 | static int char2uni(const unsigned char *rawstring, int boundlen, |
40 | wchar_t *uni) |
41 | { |
42 | int n; |
43 | |
44 | if ((*rawstring & 0xef) != 0xae) { |
45 | /* koi8-ru and koi8-u differ only on two characters */ |
46 | *uni = (*rawstring & 0x10) ? 0x040e : 0x045e; |
47 | return 1; |
48 | } |
49 | |
50 | n = p_nls->char2uni(rawstring, boundlen, uni); |
51 | return n; |
52 | } |
53 | |
54 | static struct nls_table table = { |
55 | .charset = "koi8-ru" , |
56 | .uni2char = uni2char, |
57 | .char2uni = char2uni, |
58 | }; |
59 | |
60 | static int __init init_nls_koi8_ru(void) |
61 | { |
62 | p_nls = load_nls(charset: "koi8-u" ); |
63 | |
64 | if (p_nls) { |
65 | table.charset2upper = p_nls->charset2upper; |
66 | table.charset2lower = p_nls->charset2lower; |
67 | return register_nls(&table); |
68 | } |
69 | |
70 | return -EINVAL; |
71 | } |
72 | |
73 | static void __exit exit_nls_koi8_ru(void) |
74 | { |
75 | unregister_nls(&table); |
76 | unload_nls(p_nls); |
77 | } |
78 | |
79 | module_init(init_nls_koi8_ru) |
80 | module_exit(exit_nls_koi8_ru) |
81 | |
82 | MODULE_LICENSE("Dual BSD/GPL" ); |
83 | |