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_ */