Function encode_envelope

nodedb-cluster/src/wire_version/envelope.rs:125–138

Encode a v2 envelope: `[ENVELOPE_MARKER][version u16 BE][inner_len u32 BE][inner]`.

(version: u16, inner: &[u8])

/// Encode a v2 envelope: `[ENVELOPE_MARKER][version u16 BE][inner_len u32 BE][inner]`.
fn encode_envelope(version: u16, inner: &[u8]) -> Result<Vec<u8>, WireVersionError> {
    if inner.len() > u32::MAX as usize {
        return Err(WireVersionError::DecodeFailure(format!(
            "inner payload {} bytes exceeds u32 length limit",
            inner.len()
        )));
    }
    let mut buf = Vec::with_capacity(ENVELOPE_HEADER_LEN + inner.len());
    buf.push(ENVELOPE_MARKER);
    buf.extend_from_slice(&version.to_be_bytes());
    buf.extend_from_slice(&(inner.len() as u32).to_be_bytes());
    buf.extend_from_slice(inner);
    Ok(buf)
}

/// Parse a v2 envelope.
///