1 /* 2 * UUID/GUID definition 3 * 4 * Copyright (C) 2010, 2016 Intel Corp. 5 * Huang Ying <[email protected]> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License version 9 * 2 as published by the Free Software Foundation; 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 #ifndef _LINUX_UUID_H_ 17 #define _LINUX_UUID_H_ 18 19 #include <uapi/linux/uuid.h> 20 21 #define UUID_SIZE 16 22 23 typedef struct { 24 __u8 b[UUID_SIZE]; 25 } uuid_t; 26 27 #define UUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ 28 ((uuid_t) \ 29 {{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \ 30 ((b) >> 8) & 0xff, (b) & 0xff, \ 31 ((c) >> 8) & 0xff, (c) & 0xff, \ 32 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}) 33 34 /* 35 * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee") 36 * not including trailing NUL. 37 */ 38 #define UUID_STRING_LEN 36 39 40 extern const guid_t guid_null; 41 extern const uuid_t uuid_null; 42 43 static inline bool guid_equal(const guid_t *u1, const guid_t *u2) 44 { 45 return memcmp(u1, u2, sizeof(guid_t)) == 0; 46 } 47 48 static inline void guid_copy(guid_t *dst, const guid_t *src) 49 { 50 memcpy(dst, src, sizeof(guid_t)); 51 } 52 53 static inline bool guid_is_null(const guid_t *guid) 54 { 55 return guid_equal(guid, &guid_null); 56 } 57 58 static inline bool uuid_equal(const uuid_t *u1, const uuid_t *u2) 59 { 60 return memcmp(u1, u2, sizeof(uuid_t)) == 0; 61 } 62 63 static inline void uuid_copy(uuid_t *dst, const uuid_t *src) 64 { 65 memcpy(dst, src, sizeof(uuid_t)); 66 } 67 68 static inline bool uuid_is_null(const uuid_t *uuid) 69 { 70 return uuid_equal(uuid, &uuid_null); 71 } 72 73 void generate_random_uuid(unsigned char uuid[16]); 74 75 extern void guid_gen(guid_t *u); 76 extern void uuid_gen(uuid_t *u); 77 78 bool __must_check uuid_is_valid(const char *uuid); 79 80 extern const u8 guid_index[16]; 81 extern const u8 uuid_index[16]; 82 83 int guid_parse(const char *uuid, guid_t *u); 84 int uuid_parse(const char *uuid, uuid_t *u); 85 86 /* backwards compatibility, don't use in new code */ 87 #define uuid_le_gen(u) guid_gen(u) 88 #define uuid_le_to_bin(guid, u) guid_parse(guid, u) 89 90 static inline int uuid_le_cmp(const guid_t u1, const guid_t u2) 91 { 92 return memcmp(&u1, &u2, sizeof(guid_t)); 93 } 94 95 #endif 96