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feat(crc): add checksum associated function to Crc trait for convenience

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This commit is contained in:
cscherr 2025-07-09 17:13:23 +02:00
parent 84698796d1
commit e0b79b5a22
Signed by: cscherrNT
GPG key ID: 8E2B45BC51A27EA7
2 changed files with 9 additions and 7 deletions
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5
crates/crc/src/crc_32.rs
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@ -44,7 +44,6 @@ pub const CRC32_INIT: u32 = 0xffffffff;
/// Implements CRC-32/ISO-HDLC with look up table
pub struct Crc32(<Crc32 as Crc>::Checksum);
impl Crc32 {}
impl Crc for Crc32 {
type Input = [u8];
type Checksum = u32;
@ -74,10 +73,8 @@ mod tests {
#[test]
fn test_check() {
let mut c = Crc32::new();
c.process(&CHECK_DATA);
// see https://reveng.sourceforge.io/crc-catalogue/17plus.htm#crc.cat-bits.32 for the check
// value
assert_eq!(*c.shift_reg(), 0xCBF43926);
assert_eq!(Crc32::checksum(&CHECK_DATA), 0xCBF43926);
}
}

11
crates/crc/src/lib.rs
View file

@ -5,7 +5,7 @@
//! ## Acknowledgements
//!
//! Many thanks to the [crc-catalogue](https://reveng.sourceforge.io/crc-catalogue/) for providing
//! some test vectors.
//! an overview over the various algorithms with test vectors and examples.
#![cfg_attr(not(test), no_std)]
@ -15,11 +15,16 @@ pub const CHECK_DATA: [u8; 9] = *b"123456789";
pub use crc_32::*;
pub trait Crc {
pub trait Crc: Sized {
type Input: ?Sized;
type Checksum: Eq + Default;
type Checksum: Eq + Default + Copy;
fn new() -> Self;
fn process(&mut self, data: &Self::Input);
fn shift_reg(&mut self) -> &mut Self::Checksum;
fn checksum(data: &Self::Input) -> Self::Checksum {
let mut c = Self::new();
c.process(data);
*c.shift_reg()
}
}