1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_UNICODE_H
3 #define _LINUX_UNICODE_H
4
5 #include <linux/init.h>
6 #include <linux/dcache.h>
7
8 struct utf8data;
9 struct utf8data_table;
10
11 #define UNICODE_MAJ_SHIFT 16
12 #define UNICODE_MIN_SHIFT 8
13
14 #define UNICODE_AGE(MAJ, MIN, REV) \
15 (((unsigned int)(MAJ) << UNICODE_MAJ_SHIFT) | \
16 ((unsigned int)(MIN) << UNICODE_MIN_SHIFT) | \
17 ((unsigned int)(REV)))
18
19 #define UTF8_LATEST UNICODE_AGE(12, 1, 0)
20
unicode_major(unsigned int age)21 static inline u8 unicode_major(unsigned int age)
22 {
23 return (age >> UNICODE_MAJ_SHIFT) & 0xff;
24 }
25
unicode_minor(unsigned int age)26 static inline u8 unicode_minor(unsigned int age)
27 {
28 return (age >> UNICODE_MIN_SHIFT) & 0xff;
29 }
30
unicode_rev(unsigned int age)31 static inline u8 unicode_rev(unsigned int age)
32 {
33 return age & 0xff;
34 }
35
36 /*
37 * Two normalization forms are supported:
38 * 1) NFDI
39 * - Apply unicode normalization form NFD.
40 * - Remove any Default_Ignorable_Code_Point.
41 * 2) NFDICF
42 * - Apply unicode normalization form NFD.
43 * - Remove any Default_Ignorable_Code_Point.
44 * - Apply a full casefold (C + F).
45 */
46 enum utf8_normalization {
47 UTF8_NFDI = 0,
48 UTF8_NFDICF,
49 UTF8_NMAX,
50 };
51
52 struct unicode_map {
53 unsigned int version;
54 const struct utf8data *ntab[UTF8_NMAX];
55 const struct utf8data_table *tables;
56 struct rcu_head rcu;
57 };
58
59 int utf8_validate(const struct unicode_map *um, const struct qstr *str);
60
61 int utf8_strncmp(const struct unicode_map *um,
62 const struct qstr *s1, const struct qstr *s2);
63
64 int utf8_strncasecmp(const struct unicode_map *um,
65 const struct qstr *s1, const struct qstr *s2);
66 int utf8_strncasecmp_folded(const struct unicode_map *um,
67 const struct qstr *cf,
68 const struct qstr *s1);
69
70 int utf8_casefold(const struct unicode_map *um, const struct qstr *str,
71 unsigned char *dest, size_t dlen);
72
73 int utf8_casefold_hash(const struct unicode_map *um, const void *salt,
74 struct qstr *str);
75
76 struct unicode_map *utf8_load(unsigned int version);
77 void utf8_unload(struct unicode_map *um);
78
79 int utf8_parse_version(char *version);
80
81 #endif /* _LINUX_UNICODE_H */
82