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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2013 Tox project.
* Copyright © 2013 plutooo
*/
/**
* Utilities.
*/
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600
#endif
#include "util.h"
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "ccompat.h"
bool is_power_of_2(uint64_t x)
{
return x != 0 && (x & (~x + 1)) == x;
}
void free_uint8_t_pointer_array(uint8_t **ary, size_t n_items)
{
if (ary == nullptr) {
return;
}
for (size_t i = 0; i < n_items; ++i) {
if (ary[i] != nullptr) {
free(ary[i]);
}
}
free(ary);
}
uint16_t data_checksum(const uint8_t *data, uint32_t length)
{
uint8_t checksum[2] = {0};
uint16_t check;
for (uint32_t i = 0; i < length; ++i) {
checksum[i % 2] ^= data[i];
}
memcpy(&check, checksum, sizeof(check));
return check;
}
int create_recursive_mutex(pthread_mutex_t *mutex)
{
pthread_mutexattr_t attr;
if (pthread_mutexattr_init(&attr) != 0) {
return -1;
}
if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
pthread_mutexattr_destroy(&attr);
return -1;
}
/* Create queue mutex */
if (pthread_mutex_init(mutex, &attr) != 0) {
pthread_mutexattr_destroy(&attr);
return -1;
}
pthread_mutexattr_destroy(&attr);
return 0;
}
bool memeq(const uint8_t *a, size_t a_size, const uint8_t *b, size_t b_size)
{
return a_size == b_size && memcmp(a, b, a_size) == 0;
}
int16_t max_s16(int16_t a, int16_t b)
{
return a > b ? a : b;
}
int32_t max_s32(int32_t a, int32_t b)
{
return a > b ? a : b;
}
int64_t max_s64(int64_t a, int64_t b)
{
return a > b ? a : b;
}
int16_t min_s16(int16_t a, int16_t b)
{
return a < b ? a : b;
}
int32_t min_s32(int32_t a, int32_t b)
{
return a < b ? a : b;
}
int64_t min_s64(int64_t a, int64_t b)
{
return a < b ? a : b;
}
uint16_t max_u16(uint16_t a, uint16_t b)
{
return a > b ? a : b;
}
uint32_t max_u32(uint32_t a, uint32_t b)
{
return a > b ? a : b;
}
uint64_t max_u64(uint64_t a, uint64_t b)
{
return a > b ? a : b;
}
uint16_t min_u16(uint16_t a, uint16_t b)
{
return a < b ? a : b;
}
uint32_t min_u32(uint32_t a, uint32_t b)
{
return a < b ? a : b;
}
uint64_t min_u64(uint64_t a, uint64_t b)
{
return a < b ? a : b;
}
uint32_t jenkins_one_at_a_time_hash(const uint8_t *key, size_t len)
{
uint32_t hash = 0;
for (uint32_t i = 0; i < len; ++i) {
hash += key[i];
hash += hash << 10;
hash ^= hash >> 6;
}
hash += hash << 3;
hash ^= hash >> 11;
hash += hash << 15;
return hash;
}
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