netaddr2/netv4addr/
merge.rs

1use super::Netv4Addr;
2use crate::traits::Merge;
3use core::cmp::Ordering;
4use std::net::Ipv4Addr;
5
6impl Merge for Netv4Addr {
7	type Output = Option<Self>;
8
9	fn merge(&self, other: &Self) -> Self::Output {
10		let addr: u32 = self.addr().into();
11		let mask: u32 = self.mask().into();
12		let other_addr: u32 = other.addr().into();
13		let other_mask: u32 = other.mask().into();
14
15		let mask: u32 = match mask.cmp(&other_mask) {
16			Ordering::Equal => mask << 1,
17			Ordering::Less => mask,
18			Ordering::Greater => other_mask,
19		};
20
21		if addr & mask == other_addr & mask {
22			Some(Self::new(Ipv4Addr::from(addr & mask), Ipv4Addr::from(mask)))
23		} else {
24			None
25		}
26	}
27}
28
29#[cfg(test)]
30mod tests {
31	use super::*;
32
33	#[test]
34	fn mergeable_networks_correct() {
35		let a: Netv4Addr = "10.0.0.0/24".parse().unwrap();
36		let b: Netv4Addr = "10.0.1.0/24".parse().unwrap();
37
38		assert_eq!(a.merge(&b), Some("10.0.0.0/23".parse().unwrap()));
39	}
40
41	#[test]
42	fn mergeable_networks_reflexive() {
43		let a: Netv4Addr = "10.0.0.0/24".parse().unwrap();
44		let b: Netv4Addr = "10.0.1.0/24".parse().unwrap();
45
46		assert_eq!(a.merge(&b), b.merge(&a));
47	}
48
49	#[test]
50	fn nested_networks_takes_biggest() {
51		let a: Netv4Addr = "10.0.0.0/24".parse().unwrap();
52		let b: Netv4Addr = "10.0.0.0/23".parse().unwrap();
53
54		assert_eq!(a.merge(&b), Some(b));
55	}
56
57	#[test]
58	fn nested_networks_reflexive() {
59		let a: Netv4Addr = "10.0.0.0/24".parse().unwrap();
60		let b: Netv4Addr = "10.0.0.0/23".parse().unwrap();
61
62		assert_eq!(a.merge(&b), b.merge(&a));
63	}
64
65	#[test]
66	fn adjacent_but_not_mergable_none() {
67		let a: Netv4Addr = "10.0.1.0/24".parse().unwrap();
68		let b: Netv4Addr = "10.0.2.0/24".parse().unwrap();
69
70		assert_eq!(a.merge(&b), None);
71		assert_eq!(b.merge(&a), None);
72		assert_eq!(a.merge(&b), b.merge(&a));
73	}
74}
netaddr2/netv4addr/merge.rs

netaddr2/netv4addr/
merge.rs
