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1 | #ifndef _LINUX_NLS_H |
2 | #define _LINUX_NLS_H |
3 | |
4 | #include <linux/init.h> |
5 | |
6 | /* Unicode has changed over the years. Unicode code points no longer |
7 | * fit into 16 bits; as of Unicode 5 valid code points range from 0 |
8 | * to 0x10ffff (17 planes, where each plane holds 65536 code points). |
9 | * |
10 | * The original decision to represent Unicode characters as 16-bit |
11 | * wchar_t values is now outdated. But plane 0 still includes the |
12 | * most commonly used characters, so we will retain it. The newer |
13 | * 32-bit unicode_t type can be used when it is necessary to |
14 | * represent the full Unicode character set. |
15 | */ |
16 | |
17 | /* Plane-0 Unicode character */ |
18 | typedef u16 wchar_t; |
19 | #define MAX_WCHAR_T 0xffff |
20 | |
21 | /* Arbitrary Unicode character */ |
22 | typedef u32 unicode_t; |
23 | |
24 | struct nls_table { |
25 | const char *charset; |
26 | const char *alias; |
27 | int (*uni2char) (wchar_t uni, unsigned char *out, int boundlen); |
28 | int (*char2uni) (const unsigned char *rawstring, int boundlen, |
29 | wchar_t *uni); |
30 | const unsigned char *charset2lower; |
31 | const unsigned char *charset2upper; |
32 | struct module *owner; |
33 | struct nls_table *next; |
34 | }; |
35 | |
36 | /* this value hold the maximum octet of charset */ |
37 | #define NLS_MAX_CHARSET_SIZE 6 /* for UTF-8 */ |
38 | |
39 | /* Byte order for UTF-16 strings */ |
40 | enum utf16_endian { |
41 | UTF16_HOST_ENDIAN, |
42 | UTF16_LITTLE_ENDIAN, |
43 | UTF16_BIG_ENDIAN |
44 | }; |
45 | |
46 | /* nls.c */ |
47 | extern int register_nls(struct nls_table *); |
48 | extern int unregister_nls(struct nls_table *); |
49 | extern struct nls_table *load_nls(char *); |
50 | extern void unload_nls(struct nls_table *); |
51 | extern struct nls_table *load_nls_default(void); |
52 | |
53 | extern int utf8_to_utf32(const u8 *s, int len, unicode_t *pu); |
54 | extern int utf32_to_utf8(unicode_t u, u8 *s, int maxlen); |
55 | extern int utf8s_to_utf16s(const u8 *s, int len, wchar_t *pwcs); |
56 | extern int utf16s_to_utf8s(const wchar_t *pwcs, int len, |
57 | enum utf16_endian endian, u8 *s, int maxlen); |
58 | |
59 | static inline unsigned char nls_tolower(struct nls_table *t, unsigned char c) |
60 | { |
61 | unsigned char nc = t->charset2lower[c]; |
62 | |
63 | return nc ? nc : c; |
64 | } |
65 | |
66 | static inline unsigned char nls_toupper(struct nls_table *t, unsigned char c) |
67 | { |
68 | unsigned char nc = t->charset2upper[c]; |
69 | |
70 | return nc ? nc : c; |
71 | } |
72 | |
73 | static inline int nls_strnicmp(struct nls_table *t, const unsigned char *s1, |
74 | const unsigned char *s2, int len) |
75 | { |
76 | while (len--) { |
77 | if (nls_tolower(t, *s1++) != nls_tolower(t, *s2++)) |
78 | return 1; |
79 | } |
80 | |
81 | return 0; |
82 | } |
83 | |
84 | /* |
85 | * nls_nullsize - return length of null character for codepage |
86 | * @codepage - codepage for which to return length of NULL terminator |
87 | * |
88 | * Since we can't guarantee that the null terminator will be a particular |
89 | * length, we have to check against the codepage. If there's a problem |
90 | * determining it, assume a single-byte NULL terminator. |
91 | */ |
92 | static inline int |
93 | nls_nullsize(const struct nls_table *codepage) |
94 | { |
95 | int charlen; |
96 | char tmp[NLS_MAX_CHARSET_SIZE]; |
97 | |
98 | charlen = codepage->uni2char(0, tmp, NLS_MAX_CHARSET_SIZE); |
99 | |
100 | return charlen > 0 ? charlen : 1; |
101 | } |
102 | |
103 | #define MODULE_ALIAS_NLS(name) MODULE_ALIAS("nls_" __stringify(name)) |
104 | |
105 | #endif /* _LINUX_NLS_H */ |
106 | |
107 |
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