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 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(const 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(const 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