/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (C) 2014 Samsung Electronics
 * Przemyslaw Marczak <p.marczak@samsung.com>
 * Copyright 2022-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
 *
 * Authors:
 *   Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
 */
#ifndef __UUID_H__
#define __UUID_H__

#include <linux/bitops.h>

/* This is structure is in big-endian */
struct uuid {
	unsigned int time_low;
	unsigned short time_mid;
	unsigned short time_hi_and_version;
	unsigned char clock_seq_hi_and_reserved;
	unsigned char clock_seq_low;
	unsigned char node[6];
} __packed;

/* Bits of a bitmask specifying the output format for GUIDs */
#define UUID_STR_FORMAT_STD	0
#define UUID_STR_FORMAT_GUID	BIT(0)
#define UUID_STR_UPPER_CASE	BIT(1)

/* Use UUID_STR_LEN + 1 for string space */
#define UUID_STR_LEN		36
#define UUID_BIN_LEN		sizeof(struct uuid)

#define UUID_VERSION_MASK	0xf000
#define UUID_VERSION_SHIFT	12
#define UUID_VERSION		0x4

#define UUID_VARIANT_MASK	0xc0
#define UUID_VARIANT_SHIFT	7
#define UUID_VARIANT		0x1

int uuid_str_valid(const char *uuid);
int uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin,
		    int str_format);
void uuid_bin_to_str(const unsigned char *uuid_bin, char *uuid_str,
		     int str_format);
int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin);
const char *uuid_guid_get_str(const unsigned char *guid_bin);
void gen_rand_uuid(unsigned char *uuid_bin);
void gen_rand_uuid_str(char *uuid_str, int str_format);

/**
 * uuid_str_to_le_bin() - Convert string UUID to little endian binary data.
 * @uuid_str:	pointer to UUID string
 * @uuid_bin:	pointer to allocated array for little endian output [16B]
 * Return:
 *    uuid_bin filled with little endian UUID data
 *    On success 0 is returned. Otherwise, failure code.
 */
int uuid_str_to_le_bin(const char *uuid_str, unsigned char *uuid_bin);

#endif