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 typedef struct { 22 __u8 b[16]; 23 } uuid_t; 24 25 #define UUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ 26 ((uuid_t) \ 27 {{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \ 28 ((b) >> 8) & 0xff, (b) & 0xff, \ 29 ((c) >> 8) & 0xff, (c) & 0xff, \ 30 (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }}) 31 32 /* 33 * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee") 34 * not including trailing NUL. 35 */ 36 #define UUID_STRING_LEN 36 37 38 extern const guid_t guid_null; 39 extern const uuid_t uuid_null; 40 41 static inline bool guid_equal(const guid_t *u1, const guid_t *u2) 42 { 43 return memcmp(u1, u2, sizeof(guid_t)) == 0; 44 } 45 46 static inline void guid_copy(guid_t *dst, const guid_t *src) 47 { 48 memcpy(dst, src, sizeof(guid_t)); 49 } 50 51 static inline bool guid_is_null(guid_t *guid) 52 { 53 return guid_equal(guid, &guid_null); 54 } 55 56 static inline bool uuid_equal(const uuid_t *u1, const uuid_t *u2) 57 { 58 return memcmp(u1, u2, sizeof(uuid_t)) == 0; 59 } 60 61 static inline void uuid_copy(uuid_t *dst, const uuid_t *src) 62 { 63 memcpy(dst, src, sizeof(uuid_t)); 64 } 65 66 static inline bool uuid_is_null(uuid_t *uuid) 67 { 68 return uuid_equal(uuid, &uuid_null); 69 } 70 71 void generate_random_uuid(unsigned char uuid[16]); 72 73 extern void guid_gen(guid_t *u); 74 extern void uuid_gen(uuid_t *u); 75 76 bool __must_check uuid_is_valid(const char *uuid); 77 78 extern const u8 guid_index[16]; 79 extern const u8 uuid_index[16]; 80 81 int guid_parse(const char *uuid, guid_t *u); 82 int uuid_parse(const char *uuid, uuid_t *u); 83 84 /* backwards compatibility, don't use in new code */ 85 typedef uuid_t uuid_be; 86 #define UUID_BE(a, _b, c, d0, d1, d2, d3, d4, d5, d6, d7) \ 87 UUID_INIT(a, _b, c, d0, d1, d2, d3, d4, d5, d6, d7) 88 #define NULL_UUID_BE \ 89 UUID_BE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, \ 90 0x00, 0x00, 0x00, 0x00) 91 92 #define uuid_le_gen(u) guid_gen(u) 93 #define uuid_be_gen(u) uuid_gen(u) 94 #define uuid_le_to_bin(guid, u) guid_parse(guid, u) 95 #define uuid_be_to_bin(uuid, u) uuid_parse(uuid, u) 96 97 static inline int uuid_le_cmp(const guid_t u1, const guid_t u2) 98 { 99 return memcmp(&u1, &u2, sizeof(guid_t)); 100 } 101 102 static inline int uuid_be_cmp(const uuid_t u1, const uuid_t u2) 103 { 104 return memcmp(&u1, &u2, sizeof(uuid_t)); 105 } 106 107 #endif 108