remarkable-linux/include/linux/uuid.h

/*
 * UUID/GUID definition
 *
 * Copyright (C) 2010, 2016 Intel Corp.
 *	Huang Ying <ying.huang@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#ifndef _LINUX_UUID_H_
#define _LINUX_UUID_H_

#include <uapi/linux/uuid.h>

typedef struct {
	__u8 b[16];
} uuid_be;

#define UUID_BE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)		\
((uuid_be)								\
{{ ((a) >> 24) & 0xff, ((a) >> 16) & 0xff, ((a) >> 8) & 0xff, (a) & 0xff, \
   ((b) >> 8) & 0xff, (b) & 0xff,					\
   ((c) >> 8) & 0xff, (c) & 0xff,					\
   (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})

#define NULL_UUID_BE							\
	UUID_BE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00,	\
		0x00, 0x00, 0x00, 0x00)

/*
 * The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
 * not including trailing NUL.
 */
#define	UUID_STRING_LEN		36

static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2)
{
	return memcmp(&u1, &u2, sizeof(uuid_le));
}

static inline int uuid_be_cmp(const uuid_be u1, const uuid_be u2)
{
	return memcmp(&u1, &u2, sizeof(uuid_be));
}

void generate_random_uuid(unsigned char uuid[16]);

extern void uuid_le_gen(uuid_le *u);
extern void uuid_be_gen(uuid_be *u);

bool __must_check uuid_is_valid(const char *uuid);

extern const u8 uuid_le_index[16];
extern const u8 uuid_be_index[16];

int uuid_le_to_bin(const char *uuid, uuid_le *u);
int uuid_be_to_bin(const char *uuid, uuid_be *u);

#endif