const_oid/
buffer.rs

1//! Array-backed buffer for BER bytes.
2
3/// Array-backed buffer for storing BER computed at compile-time.
4#[derive(Copy, Clone, Eq, Hash, PartialEq, PartialOrd, Ord)]
5pub struct Buffer<const SIZE: usize> {
6    /// Length in bytes
7    pub(crate) length: u8,
8
9    /// Array containing BER/DER-serialized bytes (no header)
10    pub(crate) bytes: [u8; SIZE],
11}
12
13impl<const SIZE: usize> Buffer<SIZE> {
14    /// Borrow the inner byte slice.
15    pub const fn as_bytes(&self) -> &[u8] {
16        self.bytes.split_at(self.length as usize).0
17    }
18
19    /// Get the length of the BER message.
20    pub const fn len(&self) -> usize {
21        self.length as usize
22    }
23
24    /// Const comparison of two buffers.
25    pub const fn eq(&self, rhs: &Self) -> bool {
26        if self.length != rhs.length {
27            return false;
28        }
29
30        let mut i = 0usize;
31
32        while i < self.len() {
33            if self.bytes[i] != rhs.bytes[i] {
34                return false;
35            }
36
37            // Won't overflow due to `i < self.len()` check above
38            #[allow(clippy::arithmetic_side_effects)]
39            {
40                i += 1;
41            }
42        }
43
44        true
45    }
46}
47
48impl<const SIZE: usize> AsRef<[u8]> for Buffer<SIZE> {
49    fn as_ref(&self) -> &[u8] {
50        self.as_bytes()
51    }
52}
const_oid/buffer.rs

const_oid/
buffer.rs
