1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66

use std::{error, fmt};

/// Error that can happen when encoding some bytes into a multihash.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum EncodeError {
    /// The requested hash algorithm isn't supported by this library.
    UnsupportedType,
    /// The input length is too large for the hash algorithm.
    UnsupportedInputLength,
}

impl fmt::Display for EncodeError {
    #[inline]
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            EncodeError::UnsupportedType => write!(f, "This type is not supported yet"),
            EncodeError::UnsupportedInputLength => write!(
                f,
                "The length of the input for the given hash is not yet supported"
            ),
        }
    }
}

impl error::Error for EncodeError {}

/// Error that can happen when decoding some bytes.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum DecodeError {
    /// The input doesn't have a correct length.
    BadInputLength,
    /// The code of the hashing algorithm is incorrect.
    UnknownCode,
}

impl fmt::Display for DecodeError {
    #[inline]
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            DecodeError::BadInputLength => write!(f, "Not matching input length"),
            DecodeError::UnknownCode => write!(f, "Found unknown code"),
        }
    }
}

impl error::Error for DecodeError {}

/// Error that can happen when decoding some bytes.
///
/// Same as `DecodeError`, but allows retreiving the data whose decoding was attempted.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct DecodeOwnedError {
    /// The error.
    pub error: DecodeError,
    /// The data whose decoding was attempted.
    pub data: Vec<u8>,
}

impl fmt::Display for DecodeOwnedError {
    #[inline]
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.error)
    }
}

impl error::Error for DecodeOwnedError {}