1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_UNICODE_H
3 #define _LINUX_UNICODE_H
5 #include <linux/init.h>
6 #include <linux/dcache.h>
11 #define UNICODE_MAJ_SHIFT 16
12 #define UNICODE_MIN_SHIFT 8
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)))
19 #define UTF8_LATEST UNICODE_AGE(12, 1, 0)
21 static inline u8 unicode_major(unsigned int age)
23 return (age >> UNICODE_MAJ_SHIFT) & 0xff;
26 static inline u8 unicode_minor(unsigned int age)
28 return (age >> UNICODE_MIN_SHIFT) & 0xff;
31 static inline u8 unicode_rev(unsigned int age)
37 * Two normalization forms are supported:
39 * - Apply unicode normalization form NFD.
40 * - Remove any Default_Ignorable_Code_Point.
42 * - Apply unicode normalization form NFD.
43 * - Remove any Default_Ignorable_Code_Point.
44 * - Apply a full casefold (C + F).
46 enum utf8_normalization {
54 const struct utf8data *ntab[UTF8_NMAX];
55 const struct utf8data_table *tables;
58 int utf8_validate(const struct unicode_map *um, const struct qstr *str);
60 int utf8_strncmp(const struct unicode_map *um,
61 const struct qstr *s1, const struct qstr *s2);
63 int utf8_strncasecmp(const struct unicode_map *um,
64 const struct qstr *s1, const struct qstr *s2);
65 int utf8_strncasecmp_folded(const struct unicode_map *um,
66 const struct qstr *cf,
67 const struct qstr *s1);
69 int utf8_normalize(const struct unicode_map *um, const struct qstr *str,
70 unsigned char *dest, size_t dlen);
72 int utf8_casefold(const struct unicode_map *um, const struct qstr *str,
73 unsigned char *dest, size_t dlen);
75 int utf8_casefold_hash(const struct unicode_map *um, const void *salt,
78 struct unicode_map *utf8_load(unsigned int version);
79 void utf8_unload(struct unicode_map *um);
81 int utf8_parse_version(char *version);
83 #endif /* _LINUX_UNICODE_H */