mirror of https://github.com/ipxe/ipxe.git
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
#ifndef _IPXE_UUID_H
|
|
#define _IPXE_UUID_H
|
|
|
|
/** @file
|
|
*
|
|
* Universally unique IDs
|
|
*/
|
|
|
|
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
|
|
|
|
#include <stdint.h>
|
|
#include <byteswap.h>
|
|
|
|
/** A universally unique ID */
|
|
union uuid {
|
|
/** Canonical form (00000000-0000-0000-0000-000000000000) */
|
|
struct {
|
|
/** 8 hex digits, big-endian */
|
|
uint32_t a;
|
|
/** 2 hex digits, big-endian */
|
|
uint16_t b;
|
|
/** 2 hex digits, big-endian */
|
|
uint16_t c;
|
|
/** 2 hex digits, big-endian */
|
|
uint16_t d;
|
|
/** 12 hex digits, big-endian */
|
|
uint8_t e[6];
|
|
} canonical;
|
|
uint8_t raw[16];
|
|
};
|
|
|
|
/**
|
|
* Change UUID endianness
|
|
*
|
|
* @v uuid UUID
|
|
*
|
|
* RFC4122 defines UUIDs as being encoded in network byte order, but
|
|
* leaves some wriggle room for "explicit application or presentation
|
|
* protocol specification to the contrary". PXE, EFI and SMBIOS
|
|
* (versions 2.6 and above) treat the first three fields as being
|
|
* little-endian.
|
|
*/
|
|
static inline void uuid_mangle ( union uuid *uuid ) {
|
|
|
|
__bswap_32s ( &uuid->canonical.a );
|
|
__bswap_16s ( &uuid->canonical.b );
|
|
__bswap_16s ( &uuid->canonical.c );
|
|
}
|
|
|
|
extern const char * uuid_ntoa ( const union uuid *uuid );
|
|
extern int uuid_aton ( const char *string, union uuid *uuid );
|
|
|
|
#endif /* _IPXE_UUID_H */
|