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 21 static inline u8 unicode_major(unsigned int age) 22 { 23 return (age >> UNICODE_MAJ_SHIFT) & 0xff; 24 } 25 26 static inline u8 unicode_minor(unsigned int age) 27 { 28 return (age >> UNICODE_MIN_SHIFT) & 0xff; 29 } 30 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 }; 57 58 int utf8_validate(const struct unicode_map *um, const struct qstr *str); 59 60 int utf8_strncmp(const struct unicode_map *um, 61 const struct qstr *s1, const struct qstr *s2); 62 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); 68 69 int utf8_normalize(const struct unicode_map *um, const struct qstr *str, 70 unsigned char *dest, size_t dlen); 71 72 int utf8_casefold(const struct unicode_map *um, const struct qstr *str, 73 unsigned char *dest, size_t dlen); 74 75 int utf8_casefold_hash(const struct unicode_map *um, const void *salt, 76 struct qstr *str); 77 78 struct unicode_map *utf8_load(unsigned int version); 79 void utf8_unload(struct unicode_map *um); 80 81 int utf8_parse_version(char *version); 82 83 #endif /* _LINUX_UNICODE_H */ 84