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
139
140
141
142
143
144
145
146
147

use crate::*;
use core::convert::TryFrom;

/// ASN.1 `BOOLEAN` type
///
/// BER objects consider any non-zero value as `true`, and `0` as `false`.
///
/// DER objects must use value `0x0` (`false`) or `0xff` (`true`).
#[derive(Debug, PartialEq)]
pub struct Boolean {
    pub value: u8,
}

impl Boolean {
    /// `BOOLEAN` object for value `false`
    pub const FALSE: Boolean = Boolean::new(0);
    /// `BOOLEAN` object for value `true`
    pub const TRUE: Boolean = Boolean::new(0xff);

    /// Create a new `Boolean` from the provided logical value.
    #[inline]
    pub const fn new(value: u8) -> Self {
        Boolean { value }
    }

    /// Return the `bool` value from this object.
    #[inline]
    pub const fn bool(&self) -> bool {
        self.value != 0
    }
}

impl<'a> TryFrom<Any<'a>> for Boolean {
    type Error = Error;

    fn try_from(any: Any<'a>) -> Result<Boolean> {
        TryFrom::try_from(&any)
    }
}

// non-consuming version
impl<'a, 'b> TryFrom<&'b Any<'a>> for Boolean {
    type Error = Error;

    fn try_from(any: &'b Any<'a>) -> Result<Boolean> {
        any.tag().assert_eq(Self::TAG)?;
        // X.690 section 8.2.1:
        // The encoding of a boolean value shall be primitive. The contents octets shall consist of a single octet
        if any.header.length != Length::Definite(1) {
            return Err(Error::InvalidLength);
        }
        let value = any.data[0];
        Ok(Boolean { value })
    }
}

impl<'a> CheckDerConstraints for Boolean {
    fn check_constraints(any: &Any) -> Result<()> {
        let c = any.data[0];
        // X.690 section 11.1
        if !(c == 0 || c == 0xff) {
            return Err(Error::DerConstraintFailed(DerConstraint::InvalidBoolean));
        }
        Ok(())
    }
}

impl DerAutoDerive for Boolean {}

impl<'a> Tagged for Boolean {
    const TAG: Tag = Tag::Boolean;
}

#[cfg(feature = "std")]
impl ToDer for Boolean {
    fn to_der_len(&self) -> Result<usize> {
        // 3 = 1 (tag) + 1 (length) + 1 (value)
        Ok(3)
    }

    fn write_der_header(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
        writer.write(&[Self::TAG.0 as u8, 0x01]).map_err(Into::into)
    }

    fn write_der_content(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
        let b = if self.value != 0 { 0xff } else { 0x00 };
        writer.write(&[b]).map_err(Into::into)
    }

    /// Similar to using `to_der`, but uses header without computing length value
    fn write_der_raw(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
        let sz = writer.write(&[Self::TAG.0 as u8, 0x01, self.value])?;
        Ok(sz)
    }
}

impl<'a> TryFrom<Any<'a>> for bool {
    type Error = Error;

    fn try_from(any: Any<'a>) -> Result<bool> {
        TryFrom::try_from(&any)
    }
}

impl<'a, 'b> TryFrom<&'b Any<'a>> for bool {
    type Error = Error;

    fn try_from(any: &'b Any<'a>) -> Result<bool> {
        any.tag().assert_eq(Self::TAG)?;
        let b = Boolean::try_from(any)?;
        Ok(b.bool())
    }
}

impl<'a> CheckDerConstraints for bool {
    fn check_constraints(any: &Any) -> Result<()> {
        let c = any.data[0];
        // X.690 section 11.1
        if !(c == 0 || c == 0xff) {
            return Err(Error::DerConstraintFailed(DerConstraint::InvalidBoolean));
        }
        Ok(())
    }
}

impl DerAutoDerive for bool {}

impl<'a> Tagged for bool {
    const TAG: Tag = Tag::Boolean;
}

#[cfg(feature = "std")]
impl ToDer for bool {
    fn to_der_len(&self) -> Result<usize> {
        // 3 = 1 (tag) + 1 (length) + 1 (value)
        Ok(3)
    }

    fn write_der_header(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
        writer.write(&[Self::TAG.0 as u8, 0x01]).map_err(Into::into)
    }

    fn write_der_content(&self, writer: &mut dyn std::io::Write) -> SerializeResult<usize> {
        let b = if *self { 0xff } else { 0x00 };
        writer.write(&[b]).map_err(Into::into)
    }
}