| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _LINUX_UNICODE_H |
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| 3 | #define _LINUX_UNICODE_H |
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| 4 | |
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| 5 | #include <linux/init.h> |
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| 6 | #include <linux/dcache.h> |
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| 7 | |
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| 8 | struct utf8data; |
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| 9 | struct utf8data_table; |
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| 10 | |
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| 11 | #define UNICODE_MAJ_SHIFT 16 |
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| 12 | #define UNICODE_MIN_SHIFT 8 |
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| 13 | |
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| 14 | #define UNICODE_AGE(MAJ, MIN, REV) \ |
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| 15 | (((unsigned int)(MAJ) << UNICODE_MAJ_SHIFT) | \ |
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| 16 | ((unsigned int)(MIN) << UNICODE_MIN_SHIFT) | \ |
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| 17 | ((unsigned int)(REV))) |
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| 18 | |
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| 19 | #define UTF8_LATEST UNICODE_AGE(12, 1, 0) |
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| 20 | |
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| 21 | static inline u8 unicode_major(unsigned int age) |
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| 22 | { |
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| 23 | return (age >> UNICODE_MAJ_SHIFT) & 0xff; |
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| 24 | } |
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| 25 | |
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| 26 | static inline u8 unicode_minor(unsigned int age) |
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| 27 | { |
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| 28 | return (age >> UNICODE_MIN_SHIFT) & 0xff; |
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| 29 | } |
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| 30 | |
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| 31 | static inline u8 unicode_rev(unsigned int age) |
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| 32 | { |
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| 33 | return age & 0xff; |
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| 34 | } |
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| 35 | |
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| 36 | /* |
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| 37 | * Two normalization forms are supported: |
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| 38 | * 1) NFDI |
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| 39 | * - Apply unicode normalization form NFD. |
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| 40 | * - Remove any Default_Ignorable_Code_Point. |
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| 41 | * 2) NFDICF |
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| 42 | * - Apply unicode normalization form NFD. |
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| 43 | * - Remove any Default_Ignorable_Code_Point. |
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| 44 | * - Apply a full casefold (C + F). |
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| 45 | */ |
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| 46 | enum utf8_normalization { |
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| 47 | UTF8_NFDI = 0, |
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| 48 | UTF8_NFDICF, |
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| 49 | UTF8_NMAX, |
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| 50 | }; |
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| 51 | |
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| 52 | struct unicode_map { |
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| 53 | unsigned int version; |
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| 54 | const struct utf8data *ntab[UTF8_NMAX]; |
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| 55 | const struct utf8data_table *tables; |
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| 56 | }; |
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| 57 | |
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| 58 | int utf8_validate(const struct unicode_map *um, const struct qstr *str); |
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| 59 | |
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| 60 | int utf8_strncmp(const struct unicode_map *um, |
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| 61 | const struct qstr *s1, const struct qstr *s2); |
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| 62 | |
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| 63 | int utf8_strncasecmp(const struct unicode_map *um, |
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| 64 | const struct qstr *s1, const struct qstr *s2); |
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| 65 | int utf8_strncasecmp_folded(const struct unicode_map *um, |
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| 66 | const struct qstr *cf, |
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| 67 | const struct qstr *s1); |
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| 68 | |
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| 69 | int utf8_normalize(const struct unicode_map *um, const struct qstr *str, |
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| 70 | unsigned char *dest, size_t dlen); |
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| 71 | |
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| 72 | int utf8_casefold(const struct unicode_map *um, const struct qstr *str, |
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| 73 | unsigned char *dest, size_t dlen); |
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| 74 | |
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| 75 | int utf8_casefold_hash(const struct unicode_map *um, const void *salt, |
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| 76 | struct qstr *str); |
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| 77 | |
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| 78 | struct unicode_map *utf8_load(unsigned int version); |
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| 79 | void utf8_unload(struct unicode_map *um); |
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| 80 | |
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| 81 | int utf8_parse_version(char *version); |
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| 82 | |
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| 83 | #endif /* _LINUX_UNICODE_H */ |
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| 84 | |
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