/*
 * util.h -- Utilities.
 *
 * This file is donated to the Tox Project.
 * Copyright 2013  plutooo
 *
 *  Copyright (C) 2013 Tox project All Rights Reserved.
 *
 *  This file is part of Tox.
 *
 *  Tox is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Tox 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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Tox.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __UTIL_H__
#define __UTIL_H__

#include <stdbool.h>
#include <stdint.h>
#include <pthread.h>

#define MIN(a,b) (((a)<(b))?(a):(b))
#define PAIR(TYPE1__, TYPE2__) struct { TYPE1__ first; TYPE2__ second; }

void unix_time_update();
uint64_t unix_time();
int is_timeout(uint64_t timestamp, uint64_t timeout);


/* id functions */
bool id_equal(const uint8_t *dest, const uint8_t *src);
uint32_t id_copy(uint8_t *dest, const uint8_t *src); /* return value is CLIENT_ID_SIZE */

void host_to_net(uint8_t *num, uint16_t numbytes);
#define net_to_host(x, y) host_to_net(x, y)

uint16_t lendian_to_host16(uint16_t lendian);
#define host_tolendian16(x) lendian_to_host16(x)

void host_to_lendian32(uint8_t *dest,  uint32_t num);
void lendian_to_host32(uint32_t *dest, const uint8_t *lendian);

/* state load/save */
typedef int (*load_state_callback_func)(void *outer, const uint8_t *data, uint32_t len, uint16_t type);
int load_state(load_state_callback_func load_state_callback, void *outer,
               const uint8_t *data, uint32_t length, uint16_t cookie_inner);

/* Returns -1 if failed or 0 if success */
int create_recursive_mutex(pthread_mutex_t *mutex);

/* Ring buffer */
typedef struct RingBuffer RingBuffer;
bool rb_full(const RingBuffer *b);
bool rb_empty(const RingBuffer *b);
void *rb_write(RingBuffer *b, void *p);
bool rb_read(RingBuffer *b, void **p);
RingBuffer *rb_new(int size);
void rb_kill(RingBuffer *b);
uint16_t rb_size(const RingBuffer *b);
uint16_t rb_data(const RingBuffer *b, void **dest);

#endif /* __UTIL_H__ */