#ifndef PD_UUID_H_
#define PD_UUID_H_ 1

#include <stdint.h>

#define PD_UUID_BINLEN 16
#define PD_UUID_STRLEN 36

struct pd_uuid_state {
	uint64_t	timestamp, node;
	uint16_t	clock_sequence;
	int	available;
	void	*rng_state;
	unsigned char uuid[16];

	int	(*get_lock)(void *);
	int	(*release_lock)(void *);
	void	*lock_data;
	int	(*read_state)(struct pd_uuid_state *s);
	int	(*save_state)(struct pd_uuid_state *s);
	/* TODO hook for a random number generator? */
	unsigned long (*random_bytes)(void *out, unsigned long outlen,
			void *prng_state);
};

struct pd_uuid {
	uint8_t	data[16];
};
typedef struct pd_uuid pd_uuid_t;

int pd_uuid_init_state(struct pd_uuid_state *s);
int pd_uuid_init(struct pd_uuid_state *s, int f);
int pd_uuid_make_v1(struct pd_uuid_state *s, pd_uuid_t *uuid);
int pd_uuid_make_v1mc(struct pd_uuid_state *s, pd_uuid_t *uuid);
int pd_uuid_make_v4(struct pd_uuid_state *s, pd_uuid_t *uuid);
int pd_uuid_make_v3(struct pd_uuid_state *s, pd_uuid_t *uuid, pd_uuid_t *ns, void *data, int len);
int pd_uuid_make_v5(struct pd_uuid_state *s, pd_uuid_t *uuid, pd_uuid_t *ns, void *data, int len);

int pd_uuid_copy(pd_uuid_t *src, pd_uuid_t *dst);
int pd_uuid_cmp(pd_uuid_t *a, pd_uuid_t *b);

int pd_set_uuid_hash(pd_uuid_t *s, void *hash, int version);

int pd_uuid_set_string(pd_uuid_t *uuid, char *s);
char *pd_uuid_get_string(pd_uuid_t *uuid, char *s);

unsigned long pd_uuid_rng_get_bytes(unsigned char *out, unsigned long outlen);

pd_uuid_t pd_uuid_ns_x500;
pd_uuid_t pd_uuid_ns_url;
pd_uuid_t pd_uuid_ns_dns;
pd_uuid_t pd_uuid_ns_oid;

#endif