mdict_rs/
error.rs

1use std::fmt;
2
3pub type Result<T, E = Error> = std::result::Result<T, E>;
4
5#[derive(Debug)]
6pub enum Error {
7    Io(std::io::Error),
8    InvalidFormat(&'static str),
9    InvalidData(String),
10    Truncated {
11        context: &'static str,
12        needed: usize,
13        remaining: usize,
14    },
15    LimitExceeded {
16        limit: &'static str,
17        value: u64,
18        max: u64,
19    },
20    ChecksumMismatch {
21        context: &'static str,
22        expected: u32,
23        actual: u32,
24    },
25    Decode {
26        context: &'static str,
27        encoding: &'static str,
28    },
29    MissingPasscode,
30    Unsupported(&'static str),
31}
32
33impl Error {
34    pub fn truncated(context: &'static str, needed: usize, remaining: usize) -> Self {
35        Self::Truncated {
36            context,
37            needed,
38            remaining,
39        }
40    }
41}
42
43impl fmt::Display for Error {
44    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
45        match self {
46            Self::Io(error) => write!(f, "I/O error: {error}"),
47            Self::InvalidFormat(context) => write!(f, "invalid format: {context}"),
48            Self::InvalidData(context) => write!(f, "invalid data: {context}"),
49            Self::Truncated {
50                context,
51                needed,
52                remaining,
53            } => write!(
54                f,
55                "truncated {context}: need {needed} bytes, have {remaining}"
56            ),
57            Self::LimitExceeded { limit, value, max } => {
58                write!(f, "limit exceeded for {limit}: {value} > {max}")
59            }
60            Self::ChecksumMismatch {
61                context,
62                expected,
63                actual,
64            } => write!(
65                f,
66                "checksum mismatch for {context}: expected {expected:#010x}, got {actual:#010x}"
67            ),
68            Self::Decode { context, encoding } => {
69                write!(f, "failed to decode {context} using {encoding}")
70            }
71            Self::MissingPasscode => write!(f, "dictionary requires a passcode"),
72            Self::Unsupported(feature) => write!(f, "unsupported feature: {feature}"),
73        }
74    }
75}
76
77impl std::error::Error for Error {
78    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
79        match self {
80            Self::Io(error) => Some(error),
81            _ => None,
82        }
83    }
84}
85
86impl From<std::io::Error> for Error {
87    fn from(value: std::io::Error) -> Self {
88        Self::Io(value)
89    }
90}
mdict_rs/error.rs

mdict_rs/
error.rs
