Function sidecar_msgpack_len

nodedb-query/src/msgpack_scan/sidecar.rs:72–79

Parse how many bytes the original msgpack occupies in a sidecar buffer.

(buf: &[u8])

/// Parse how many bytes the original msgpack occupies in a sidecar buffer.
fn sidecar_msgpack_len(buf: &[u8]) -> Option<usize> {
    if buf.len() < TRAILER_SIZE {
        return None;
    }
    let entry_count = read_entry_count(buf)?;
    let sidecar_size = (entry_count as usize) * ENTRY_SIZE + TRAILER_SIZE;
    buf.len().checked_sub(sidecar_size)
}

/// Read the entry count from the trailer (second-to-last field before magic).
fn read_entry_count(buf: &[u8]) -> Option<u16> {