src/include/uuid.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef _UUID_H_
   4 #define _UUID_H_
   5
   6 #include <string.h>
   7 #include <stdint.h>
   8
   9 #define UUID_LEN        16
  10 #define UUID_STRLEN     36
  11
  12 /*
  13  * Parses a canonical UUID string into the common byte representation
  14  * where the first three words are interpreted as little endian:
  15  *
  16  * The UUID
  17  *   "00112233-4455-6677-8899-aabbccddeeff"
  18  * is stored as
  19  *   33 22 11 00 55 44 77 66 88 99 aa bb cc dd ee ff
  20  *
  21  * Returns negative value on error, 0 on success.
  22  */
  23 int parse_uuid(uint8_t *uuid, const char *uuid_str);
  24
  25 typedef struct {
  26         uint8_t b[16];
  27 } __packed guid_t;
  28
  29 #define GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)              \
  30 ((guid_t)                                                               \
  31 {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
  32    (b) & 0xff, ((b) >> 8) & 0xff,                                       \
  33    (c) & 0xff, ((c) >> 8) & 0xff,                                       \
  34    (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) } })
  35
  36 static inline int guidcmp(const guid_t *guid1, const guid_t *guid2)
  37 {
  38         return memcmp(guid1, guid2, sizeof(guid_t));
  39 }
  40
  41 static inline guid_t *guidcpy(guid_t *dest, const guid_t *src)
  42 {
  43         return (guid_t *)memcpy(dest, src, sizeof(guid_t));
  44 }
  45
  46 #endif /* _UUID_H_ */