include/linux/uuid.h

   1 /*
   2  * UUID/GUID definition
   3  *
   4  * Copyright (C) 2010, 2016 Intel Corp.
   5  *      Huang Ying <ying.huang@intel.com>
   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