cadmpeg-ir 0.3.0

CAD data model, validation, diffing, and codec API for cadmpeg.
Documentation 
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// SPDX-License-Identifier: Apache-2.0
//! Content hashing helpers shared by codecs.

use std::fmt::Write as _;

use sha2::{Digest, Sha256};

/// Returns the lowercase hexadecimal SHA-256 digest of `bytes`.
pub fn sha256_hex(bytes: &[u8]) -> String {
    let digest = Sha256::digest(bytes);
    let mut encoded = String::with_capacity(digest.len() * 2);
    for byte in digest {
        write!(encoded, "{byte:02x}").expect("writing to a String cannot fail");
    }
    encoded
}

#[cfg(test)]
mod tests {
    use super::sha256_hex;

    #[test]
    fn encodes_sha256_as_lowercase_hexadecimal() {
        assert_eq!(
            sha256_hex(b"abc"),
            "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"
        );
    }
}