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/*
* util.c -- 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/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <time.h>
/* for CLIENT_ID_SIZE */
#include "DHT.h"
#include "util.h"
/* don't call into system billions of times for no reason */
static uint64_t unix_time_value;
static uint64_t unix_base_time_value;
void unix_time_update()
{
if (unix_base_time_value == 0)
unix_base_time_value = ((uint64_t)time(NULL) - (current_time_monotonic() / 1000ULL));
unix_time_value = (current_time_monotonic() / 1000ULL) + unix_base_time_value;
}
uint64_t unix_time()
{
return unix_time_value;
}
int is_timeout(uint64_t timestamp, uint64_t timeout)
{
return timestamp + timeout <= unix_time();
}
/* id functions */
bool id_equal(uint8_t *dest, uint8_t *src)
{
return memcmp(dest, src, CLIENT_ID_SIZE) == 0;
}
uint32_t id_copy(uint8_t *dest, uint8_t *src)
{
memcpy(dest, src, CLIENT_ID_SIZE);
return CLIENT_ID_SIZE;
}
void host_to_net(uint8_t *num, uint16_t numbytes)
{
#ifndef WORDS_BIGENDIAN
uint32_t i;
uint8_t buff[numbytes];
for (i = 0; i < numbytes; ++i) {
buff[i] = num[numbytes - i - 1];
}
memcpy(num, buff, numbytes);
#endif
return;
}
/* state load/save */
int load_state(load_state_callback_func load_state_callback, void *outer,
uint8_t *data, uint32_t length, uint16_t cookie_inner)
{
if (!load_state_callback || !data) {
#ifdef DEBUG
fprintf(stderr, "load_state() called with invalid args.\n");
#endif
return -1;
}
uint16_t type;
uint32_t length_sub, cookie_type;
uint32_t size_head = sizeof(uint32_t) * 2;
while (length >= size_head) {
memcpy(&length_sub, data, sizeof(length_sub));
memcpy(&cookie_type, data + sizeof(length_sub), sizeof(cookie_type));
data += size_head;
length -= size_head;
if (length < length_sub) {
/* file truncated */
#ifdef DEBUG
fprintf(stderr, "state file too short: %u < %u\n", length, length_sub);
#endif
return -1;
}
if ((cookie_type >> 16) != cookie_inner) {
/* something is not matching up in a bad way, give up */
#ifdef DEBUG
fprintf(stderr, "state file garbeled: %04hx != %04hx\n", (cookie_type >> 16), cookie_inner);
#endif
return -1;
}
type = cookie_type & 0xFFFF;
if (-1 == load_state_callback(outer, data, length_sub, type))
return -1;
data += length_sub;
length -= length_sub;
}
return length == 0 ? 0 : -1;
};
/* Converts 4 bytes to uint32_t */
inline__ void bytes_to_U32(uint32_t *dest, const uint8_t *bytes)
{
*dest =
#ifdef WORDS_BIGENDIAN
( ( uint32_t ) * bytes ) |
( ( uint32_t ) * ( bytes + 1 ) << 8 ) |
( ( uint32_t ) * ( bytes + 2 ) << 16 ) |
( ( uint32_t ) * ( bytes + 3 ) << 24 ) ;
#else
( ( uint32_t ) * bytes << 24 ) |
( ( uint32_t ) * ( bytes + 1 ) << 16 ) |
( ( uint32_t ) * ( bytes + 2 ) << 8 ) |
( ( uint32_t ) * ( bytes + 3 ) ) ;
#endif
}
/* Converts 2 bytes to uint16_t */
inline__ void bytes_to_U16(uint16_t *dest, const uint8_t *bytes)
{
*dest =
#ifdef WORDS_BIGENDIAN
( ( uint16_t ) * bytes ) |
( ( uint16_t ) * ( bytes + 1 ) << 8 );
#else
( ( uint16_t ) * bytes << 8 ) |
( ( uint16_t ) * ( bytes + 1 ) );
#endif
}
/* Convert uint32_t to byte string of size 4 */
inline__ void U32_to_bytes(uint8_t *dest, uint32_t value)
{
#ifdef WORDS_BIGENDIAN
*(dest) = ( value );
*(dest + 1) = ( value >> 8 );
*(dest + 2) = ( value >> 16 );
*(dest + 3) = ( value >> 24 );
#else
*(dest) = ( value >> 24 );
*(dest + 1) = ( value >> 16 );
*(dest + 2) = ( value >> 8 );
*(dest + 3) = ( value );
#endif
}
/* Convert uint16_t to byte string of size 2 */
inline__ void U16_to_bytes(uint8_t *dest, uint16_t value)
{
#ifdef WORDS_BIGENDIAN
*(dest) = ( value );
*(dest + 1) = ( value >> 8 );
#else
*(dest) = ( value >> 8 );
*(dest + 1) = ( value );
#endif
}
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