1 /// Error in the protocol addresses when creating an [`crate::ArpPacket`] or 2 /// changing the protocol addresses in an [`crate::ArpPacket`]. 3 #[derive(Debug, Clone, Eq, PartialEq, Hash)] 4 pub enum ArpProtoAddrError { 5 /// Error if the given protocol address is longer than 6 /// the maximum of 255 bytes/octets. 7 LenTooBig(usize), 8 9 /// Protocol address lengths of sender and target differ. 10 LenNonMatching(usize, usize), 11 } 12 13 impl core::fmt::Display for ArpProtoAddrError { fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result14 fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { 15 match self { 16 ArpProtoAddrError::LenTooBig(len) => 17 write!(f, "ARP Protocol Address Error: Given protocol address has a length of {len} which is greater then the maximum of 255."), 18 ArpProtoAddrError::LenNonMatching(len_sender, len_target) => 19 write!(f, "ARP Protocol Address Error: Given sender & target protocol addresses have differing lengths of {len_sender} & {len_target} (must be matching)."), 20 } 21 } 22 } 23 24 #[cfg(feature = "std")] 25 #[cfg_attr(docsrs, doc(cfg(feature = "std")))] 26 impl std::error::Error for ArpProtoAddrError { source(&self) -> Option<&(dyn std::error::Error + 'static)>27 fn source(&self) -> Option<&(dyn std::error::Error + 'static)> { 28 None 29 } 30 } 31 32 #[cfg(test)] 33 mod tests { 34 use super::ArpProtoAddrError::*; 35 use alloc::format; 36 use std::{ 37 collections::hash_map::DefaultHasher, 38 error::Error, 39 hash::{Hash, Hasher}, 40 }; 41 42 #[test] debug()43 fn debug() { 44 assert_eq!("LenTooBig(300)", format!("{:?}", LenTooBig(300))); 45 } 46 47 #[test] clone_eq_hash()48 fn clone_eq_hash() { 49 let err = LenTooBig(300); 50 assert_eq!(err, err.clone()); 51 let hash_a = { 52 let mut hasher = DefaultHasher::new(); 53 err.hash(&mut hasher); 54 hasher.finish() 55 }; 56 let hash_b = { 57 let mut hasher = DefaultHasher::new(); 58 err.clone().hash(&mut hasher); 59 hasher.finish() 60 }; 61 assert_eq!(hash_a, hash_b); 62 } 63 64 #[test] fmt()65 fn fmt() { 66 let tests = [ 67 (LenTooBig(301), "ARP Protocol Address Error: Given protocol address has a length of 301 which is greater then the maximum of 255."), 68 (LenNonMatching(23, 24), "ARP Protocol Address Error: Given sender & target protocol addresses have differing lengths of 23 & 24 (must be matching).") 69 ]; 70 for test in tests { 71 assert_eq!(format!("{}", test.0), test.1); 72 } 73 } 74 75 #[cfg(feature = "std")] 76 #[test] source()77 fn source() { 78 assert!(LenTooBig(300).source().is_none()); 79 } 80 } 81