mirror of https://git.meli.delivery/meli/meli
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
2.1 KiB
Rust
79 lines
2.1 KiB
Rust
/*
|
|
* meli - melib crate.
|
|
*
|
|
* Copyright 2017-2020 Manos Pitsidianakis
|
|
*
|
|
* This file is part of meli.
|
|
*
|
|
* meli 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.
|
|
*
|
|
* meli 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 meli. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
use std::{fs::File, io::prelude::*, time::SystemTime};
|
|
|
|
const EXPECT: &str = "Could not open/read /dev/urandom";
|
|
|
|
pub fn random_u64() -> u64 {
|
|
let mut f = File::open("/dev/urandom").expect(EXPECT);
|
|
let mut buffer = [0; 8];
|
|
|
|
// read exactly 8 bytes
|
|
f.read_exact(&mut buffer).expect(EXPECT);
|
|
|
|
u64::from(buffer[0])
|
|
| (u64::from(buffer[1]) << 8)
|
|
| (u64::from(buffer[2]) << 16)
|
|
| (u64::from(buffer[3]) << 24)
|
|
| (u64::from(buffer[4]) << 32)
|
|
| (u64::from(buffer[5]) << 40)
|
|
| (u64::from(buffer[6]) << 48)
|
|
| (u64::from(buffer[7]) << 56)
|
|
}
|
|
|
|
pub fn random_u32() -> u32 {
|
|
let mut f = File::open("/dev/urandom").expect(EXPECT);
|
|
let mut buffer = [0; 4];
|
|
|
|
// read exactly 4 bytes
|
|
f.read_exact(&mut buffer).expect(EXPECT);
|
|
|
|
u32::from(buffer[0])
|
|
| (u32::from(buffer[1]) << 8)
|
|
| (u32::from(buffer[2]) << 16)
|
|
| (u32::from(buffer[3]) << 24)
|
|
}
|
|
|
|
pub fn random_u8() -> u8 {
|
|
let mut f = File::open("/dev/urandom").expect(EXPECT);
|
|
let mut buffer = [0; 1];
|
|
|
|
// read exactly 1 byte
|
|
f.read_exact(&mut buffer).expect(EXPECT);
|
|
|
|
buffer[0]
|
|
}
|
|
|
|
pub fn clock() -> u64 {
|
|
SystemTime::now()
|
|
.duration_since(SystemTime::UNIX_EPOCH)
|
|
.unwrap()
|
|
.as_secs()
|
|
}
|
|
|
|
pub fn clock_millis() -> u128 {
|
|
SystemTime::now()
|
|
.duration_since(SystemTime::UNIX_EPOCH)
|
|
.unwrap()
|
|
.as_millis()
|
|
}
|