datastreamcorelib 1.0.1

Rust version of https://gitlab.com/advian-oss/python-datastreamcorelib
Documentation 
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/// Un/Packing helpers
use failure::Fallible;
use uuid::Uuid;

/// Encode UUID to url-safe base64
pub fn uuid_to_b64(uuid_in: uuid::Uuid) -> String {
    base64::encode_config(uuid_in.as_bytes(), base64::URL_SAFE)
}

/// Decode uuid from url-safe base64
pub fn b64_to_uuid(b64_in: String) -> Fallible<uuid::Uuid> {
    let dec_bytes = base64::decode_config(b64_in, base64::URL_SAFE)?;
    vec_to_uuid(dec_bytes)
}

/// Vector of bytes to UUID
pub fn vec_to_uuid(dec_bytes: Vec<u8>) -> Fallible<uuid::Uuid> {
    if dec_bytes.len() != 16 {
        return Err(failure::err_msg("Input is wrong size"));
    }
    let mut in_bytes: [u8; 16] = [0; 16];
    in_bytes.clone_from_slice(&dec_bytes[0..16]);
    Ok(Uuid::from_bytes(in_bytes))
}

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

    #[test]
    fn uuid_to_b64_roundtrip() {
        let randomid = Uuid::new_v4();
        let b64 = uuid_to_b64(randomid);
        let decoded = b64_to_uuid(b64).unwrap();
        assert_eq!(randomid, decoded);
    }
}