1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * linux/fs/nls/nls_koi8-ru.c
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Charset koi8-ru translation based on charset koi8-u.
5*4882a593Smuzhiyun * The Unicode to charset table has only exact mappings.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/string.h>
11*4882a593Smuzhiyun #include <linux/nls.h>
12*4882a593Smuzhiyun #include <linux/errno.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun static struct nls_table *p_nls;
15*4882a593Smuzhiyun
uni2char(const wchar_t uni,unsigned char * out,int boundlen)16*4882a593Smuzhiyun static int uni2char(const wchar_t uni,
17*4882a593Smuzhiyun unsigned char *out, int boundlen)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun if (boundlen <= 0)
20*4882a593Smuzhiyun return -ENAMETOOLONG;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun if ((uni & 0xffaf) == 0x040e || (uni & 0xffce) == 0x254c) {
23*4882a593Smuzhiyun /* koi8-ru and koi8-u differ only on two characters */
24*4882a593Smuzhiyun if (uni == 0x040e)
25*4882a593Smuzhiyun out[0] = 0xbe;
26*4882a593Smuzhiyun else if (uni == 0x045e)
27*4882a593Smuzhiyun out[0] = 0xae;
28*4882a593Smuzhiyun else if (uni == 0x255d || uni == 0x256c)
29*4882a593Smuzhiyun return 0;
30*4882a593Smuzhiyun else
31*4882a593Smuzhiyun return p_nls->uni2char(uni, out, boundlen);
32*4882a593Smuzhiyun return 1;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun else
35*4882a593Smuzhiyun /* fast path */
36*4882a593Smuzhiyun return p_nls->uni2char(uni, out, boundlen);
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
char2uni(const unsigned char * rawstring,int boundlen,wchar_t * uni)39*4882a593Smuzhiyun static int char2uni(const unsigned char *rawstring, int boundlen,
40*4882a593Smuzhiyun wchar_t *uni)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun int n;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun if ((*rawstring & 0xef) != 0xae) {
45*4882a593Smuzhiyun /* koi8-ru and koi8-u differ only on two characters */
46*4882a593Smuzhiyun *uni = (*rawstring & 0x10) ? 0x040e : 0x045e;
47*4882a593Smuzhiyun return 1;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun n = p_nls->char2uni(rawstring, boundlen, uni);
51*4882a593Smuzhiyun return n;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun static struct nls_table table = {
55*4882a593Smuzhiyun .charset = "koi8-ru",
56*4882a593Smuzhiyun .uni2char = uni2char,
57*4882a593Smuzhiyun .char2uni = char2uni,
58*4882a593Smuzhiyun };
59*4882a593Smuzhiyun
init_nls_koi8_ru(void)60*4882a593Smuzhiyun static int __init init_nls_koi8_ru(void)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun p_nls = load_nls("koi8-u");
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun if (p_nls) {
65*4882a593Smuzhiyun table.charset2upper = p_nls->charset2upper;
66*4882a593Smuzhiyun table.charset2lower = p_nls->charset2lower;
67*4882a593Smuzhiyun return register_nls(&table);
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun return -EINVAL;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
exit_nls_koi8_ru(void)73*4882a593Smuzhiyun static void __exit exit_nls_koi8_ru(void)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun unregister_nls(&table);
76*4882a593Smuzhiyun unload_nls(p_nls);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun module_init(init_nls_koi8_ru)
80*4882a593Smuzhiyun module_exit(exit_nls_koi8_ru)
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun MODULE_LICENSE("Dual BSD/GPL");
83*4882a593Smuzhiyun MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
84