uuid_rs/
rand.rs

1#![cfg(feature = "rnd")]
2
3use crate::{Layout, Variant, Version, UUID};
4
5use rand;
6
7impl UUID {
8    /// Generate a UUID from truly random numbers.
9    #[cfg(feature = "rand")]
10    pub fn v4() -> Layout {
11        let rng = rand::random::<u128>();
12        let rand = rng.to_be_bytes();
13        Layout {
14            field_low: ((rand[0] as u32) << 24)
15                | (rand[1] as u32) << 16
16                | (rand[2] as u32) << 8
17                | rand[3] as u32,
18            field_mid: (rand[4] as u16) << 8 | (rand[5] as u16),
19            field_high_and_version: ((rand[6] as u16) << 8 | (rand[7] as u16)) & 0xfff
20                | (Version::RAND as u16) << 12,
21            clock_seq_high_and_reserved: (rand[8] & 0xf) | (Variant::RFC as u8) << 4,
22            clock_seq_low: rand[9] as u8,
23            node: [rand[10], rand[11], rand[12], rand[13], rand[14], rand[15]],
24        }
25    }
26}
27
28/// Creates a lower `String` for UUID version-4.
29#[macro_export]
30macro_rules! v4 {
31    () => {
32        format!("{}", $crate::UUID::v4().as_bytes())
33    };
34    (expr:lower) => {
35        format!("{}", $crate::UUID::v4().as_bytes().to_lower())
36    };
37}
38
39#[cfg(test)]
40mod tests {
41    use super::*;
42
43    #[cfg(feature = "rand")]
44    #[test]
45    fn test_v4() {
46        let uuid = UUID::v4();
47        assert_eq!(uuid.get_version(), Some(Version::RAND));
48        assert_eq!(uuid.get_variant(), Some(Variant::RFC));
49    }
50}
uuid_rs/rand.rs

uuid_rs/
rand.rs
