summaryrefslogtreecommitdiffstats
path: root/include/linux/unicode.h
blob: 4d39e6e11a950c76f78d775fd6f351296f3d7d53 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_UNICODE_H
#define _LINUX_UNICODE_H

#include <linux/init.h>
#include <linux/dcache.h>

struct utf8data;
struct utf8data_table;

#define UNICODE_MAJ_SHIFT		16
#define UNICODE_MIN_SHIFT		8

#define UNICODE_AGE(MAJ, MIN, REV)			\
	(((unsigned int)(MAJ) << UNICODE_MAJ_SHIFT) |	\
	 ((unsigned int)(MIN) << UNICODE_MIN_SHIFT) |	\
	 ((unsigned int)(REV)))

static inline u8 unicode_major(unsigned int age)
{
	return (age >> UNICODE_MAJ_SHIFT) & 0xff;
}

static inline u8 unicode_minor(unsigned int age)
{
	return (age >> UNICODE_MIN_SHIFT) & 0xff;
}

static inline u8 unicode_rev(unsigned int age)
{
	return age & 0xff;
}

/*
 * Two normalization forms are supported:
 * 1) NFDI
 *   - Apply unicode normalization form NFD.
 *   - Remove any Default_Ignorable_Code_Point.
 * 2) NFDICF
 *   - Apply unicode normalization form NFD.
 *   - Remove any Default_Ignorable_Code_Point.
 *   - Apply a full casefold (C + F).
 */
enum utf8_normalization {
	UTF8_NFDI = 0,
	UTF8_NFDICF,
	UTF8_NMAX,
};

struct unicode_map {
	unsigned int version;
	const struct utf8data *ntab[UTF8_NMAX];
	const struct utf8data_table *tables;
};

int utf8_validate(const struct unicode_map *um, const struct qstr *str);

int utf8_strncmp(const struct unicode_map *um,
		 const struct qstr *s1, const struct qstr *s2);

int utf8_strncasecmp(const struct unicode_map *um,
		 const struct qstr *s1, const struct qstr *s2);
int utf8_strncasecmp_folded(const struct unicode_map *um,
			    const struct qstr *cf,
			    const struct qstr *s1);

int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
		   unsigned char *dest, size_t dlen);

int utf8_casefold(const struct unicode_map *um, const struct qstr *str,
		  unsigned char *dest, size_t dlen);

int utf8_casefold_hash(const struct unicode_map *um, const void *salt,
		       struct qstr *str);

struct unicode_map *utf8_load(unsigned int version);
void utf8_unload(struct unicode_map *um);

#endif /* _LINUX_UNICODE_H */