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/* 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 */
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