red_asn1 0.1.2

A little library to encode/decode ASN1 DER
Documentation 
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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138

use crate::tag::Tag;
use crate::traits::*;
use crate::error as asn1err;

pub static BOOLEAN_TAG_NUMBER: u8 = 0x1;


/// Class to encode/decode Boolean ASN1
#[derive(Debug, PartialEq, Default)]
pub struct Boolean {
    _value: Option<bool>
}

impl Boolean {

    pub fn value(&self) -> Option<bool> {
        match &self._value {
            Some(ref value) => {
                return Some(*value);
            }
            None => {
                return None;
            }
        };
    }

}

impl Asn1Object for Boolean {

    fn tag(&self) -> Tag {
        return Tag::new_primitive_universal(BOOLEAN_TAG_NUMBER);
    }

    fn encode_value(&self) -> asn1err::Result<Vec<u8>> {
        match self._value {
            Some(value) => {
                return Ok(vec![(value as u8) * 0xff]);
            },
            None => {
                return Err(asn1err::ErrorKind::NoValue)?;
            }
        }
        
    }

    fn decode_value(&mut self, raw: &[u8]) -> asn1err::Result<()> {
        if raw.len() == 0 {
            return Err(asn1err::ValueErrorKind::NoDataForType)?;
        }

        self._value = Some(raw[0] != 0);
        return Ok(());
    }

    fn unset_value(&mut self) {
        self._value = None;
    }
}

impl From<bool> for Boolean {
    fn from(value: bool) -> Self {
        return Self {
            _value: Some(value)
        };
    }
}


#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_create() {
        let b = Boolean::from(true);
        assert_eq!(true, b.value().unwrap());
    }

    #[test]
    fn test_create_default() {
        let b = Boolean::default();
        assert_eq!(None, b.value());
    }

    #[test]
    fn test_unset_value() {
        let mut b = Boolean::from(true);
        b.unset_value();
        assert_eq!(None, b.value());
    }

    #[test]
    fn test_encode() {
        assert_eq!(vec![0x1, 0x1, 0x0], Boolean::from(false).encode().unwrap());
        assert_eq!(vec![0x1, 0x1, 0xff], Boolean::from(true).encode().unwrap());
    }

    #[test]
    fn test_decode() {
        assert_eq!(Boolean::from(false), _parse(&[0x1, 0x1, 0x0]));
        assert_eq!(Boolean::from(true), _parse(&[0x1, 0x1, 0xff]));
        assert_eq!(Boolean::from(true), _parse(&[0x1, 0x1, 0x01]));
        assert_eq!(Boolean::from(true), _parse(&[0x1, 0x1, 0x7b]));
    }

    #[test]
    fn test_decode_with_excesive_bytes() {
        assert_eq!((Boolean::from(false), 3), _parse_with_consumed_octets(&[0x1, 0x1, 0x0, 0x1]));
        assert_eq!((Boolean::from(true), 3), _parse_with_consumed_octets(&[0x1, 0x1, 0xff, 0x0, 0x1, 0x2]));
        assert_eq!((Boolean::from(true), 3), _parse_with_consumed_octets(&[0x1, 0x1, 0x01, 0x0, 0x1]));
        assert_eq!((Boolean::from(true), 3), _parse_with_consumed_octets(&[0x1, 0x1, 0x7b, 0x0]));

        assert_eq!((Boolean::from(false), 4), _parse_with_consumed_octets(&[0x1, 0x2, 0x0, 0x1]));
    }

    #[should_panic (expected = "Invalid universal tag: Not match with expected tag")]
    #[test]
    fn test_decode_with_invalid_tag() {
        _parse(&[0x7, 0x1, 0x0]);
    }

    #[should_panic (expected = "Invalid value: Not enough data for type")]
    #[test]
    fn test_decode_without_enough_value_octets() {
        _parse(&[0x1, 0x0]);
    }

    fn _parse(raw: &[u8]) -> Boolean {
        return _parse_with_consumed_octets(raw).0;
    }

    fn _parse_with_consumed_octets(raw: &[u8]) -> (Boolean, usize) {
        let mut b = Boolean::from(false);
        let consumed_octets = b.decode(raw).unwrap();
        return (b, consumed_octets);
    }
}