etherparse/err/ipv4_exts/
header_write_error.rs

1#[cfg(feature = "std")]
2use super::ExtsWalkError;
3
4/// Error when writing IPv4 extension headers.
5#[cfg(feature = "std")]
6#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
7#[derive(Debug)]
8pub enum HeaderWriteError {
9    /// IO error encountered while writing.
10    Io(std::io::Error),
11    /// Data was not serializable because of its content.
12    Content(ExtsWalkError),
13}
14
15#[cfg(feature = "std")]
16#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
17impl HeaderWriteError {
18    /// Returns a reference to the [`std::io::Error`] if the value is an [`HeaderWriteError::Io`].
19    pub fn io(&self) -> Option<&std::io::Error> {
20        match self {
21            HeaderWriteError::Io(err) => Some(err),
22            HeaderWriteError::Content(_) => None,
23        }
24    }
25
26    /// Returns a reference to the [`crate::err::ipv4_exts::ExtsWalkError`] if the value is an [`HeaderWriteError::Content`].
27    pub fn content(&self) -> Option<&ExtsWalkError> {
28        match self {
29            HeaderWriteError::Io(_) => None,
30            HeaderWriteError::Content(err) => Some(err),
31        }
32    }
33}
34
35#[cfg(feature = "std")]
36#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
37impl core::fmt::Display for HeaderWriteError {
38    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
39        use HeaderWriteError::*;
40        match self {
41            Io(err) => err.fmt(f),
42            Content(err) => err.fmt(f),
43        }
44    }
45}
46
47#[cfg(feature = "std")]
48#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
49impl std::error::Error for HeaderWriteError {
50    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
51        use HeaderWriteError::*;
52        match self {
53            Io(ref err) => Some(err),
54            Content(ref err) => Some(err),
55        }
56    }
57}
58
59#[cfg(test)]
60mod tests {
61    use super::{ExtsWalkError::*, HeaderWriteError::*};
62    use crate::*;
63    use alloc::format;
64    use std::error::Error;
65
66    #[test]
67    fn io() {
68        assert!(Io(std::io::Error::new(
69            std::io::ErrorKind::UnexpectedEof,
70            "failed to fill whole buffer",
71        ))
72        .io()
73        .is_some());
74        assert!(Content(ExtNotReferenced {
75            missing_ext: IpNumber::AUTHENTICATION_HEADER,
76        })
77        .io()
78        .is_none());
79    }
80
81    #[test]
82    fn content() {
83        assert!(Io(std::io::Error::new(
84            std::io::ErrorKind::UnexpectedEof,
85            "failed to fill whole buffer",
86        ))
87        .content()
88        .is_none());
89        {
90            let err = ExtNotReferenced {
91                missing_ext: IpNumber::AUTHENTICATION_HEADER,
92            };
93            assert_eq!(Some(&err), Content(err.clone()).content());
94        }
95    }
96
97    #[test]
98    fn debug() {
99        let err = ExtNotReferenced {
100            missing_ext: IpNumber::AUTHENTICATION_HEADER,
101        };
102        assert_eq!(
103            format!("Content({:?})", err.clone()),
104            format!("{:?}", Content(err))
105        );
106    }
107
108    #[test]
109    fn fmt() {
110        {
111            let err = std::io::Error::new(
112                std::io::ErrorKind::UnexpectedEof,
113                "failed to fill whole buffer",
114            );
115            assert_eq!(format!("{}", err), format!("{}", Io(err)));
116        }
117        {
118            let err = ExtNotReferenced {
119                missing_ext: IpNumber::AUTHENTICATION_HEADER,
120            };
121            assert_eq!(format!("{}", Content(err.clone())), format!("{}", err));
122        }
123    }
124
125    #[cfg(feature = "std")]
126    #[test]
127    fn source() {
128        assert!(Io(std::io::Error::new(
129            std::io::ErrorKind::UnexpectedEof,
130            "failed to fill whole buffer",
131        ))
132        .source()
133        .is_some());
134        assert!(Content(ExtNotReferenced {
135            missing_ext: IpNumber::AUTHENTICATION_HEADER,
136        })
137        .source()
138        .is_some());
139    }
140}
etherparse/err/ipv4_exts/header_write_error.rs

etherparse/err/ipv4_exts/
header_write_error.rs
