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

//! ASN.1 `BIT STRING` support.

use crate::{Any, ByteSlice, Encodable, Encoder, Error, ErrorKind, Length, Result, Tag, Tagged};
use core::convert::TryFrom;

/// ASN.1 `BIT STRING` type.
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct BitString<'a> {
    /// Inner value
    inner: ByteSlice<'a>,
}

impl<'a> BitString<'a> {
    /// Create a new [`BitString`] from a byte slice.
    pub fn new(slice: &'a [u8]) -> Result<Self> {
        ByteSlice::new(slice)
            .map(|inner| Self { inner })
            .map_err(|_| ErrorKind::Length { tag: Self::TAG }.into())
    }

    /// Borrow the inner byte slice.
    pub fn as_bytes(&self) -> &'a [u8] {
        self.inner.as_bytes()
    }
}

impl AsRef<[u8]> for BitString<'_> {
    fn as_ref(&self) -> &[u8] {
        self.as_bytes()
    }
}

impl<'a> From<&BitString<'a>> for BitString<'a> {
    fn from(value: &BitString<'a>) -> BitString<'a> {
        *value
    }
}

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

    fn try_from(any: Any<'a>) -> Result<BitString<'a>> {
        any.tag().assert_eq(Tag::BitString)?;
        Self::new(any.as_bytes())
    }
}

impl<'a> From<BitString<'a>> for Any<'a> {
    fn from(bit_string: BitString<'a>) -> Any<'a> {
        Any {
            tag: Tag::BitString,
            value: bit_string.inner,
        }
    }
}

impl<'a> From<BitString<'a>> for &'a [u8] {
    fn from(bit_string: BitString<'a>) -> &'a [u8] {
        bit_string.as_bytes()
    }
}

impl<'a> Encodable for BitString<'a> {
    fn encoded_len(&self) -> Result<Length> {
        Any::from(*self).encoded_len()
    }

    fn encode(&self, encoder: &mut Encoder<'_>) -> Result<()> {
        Any::from(*self).encode(encoder)
    }
}

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