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//! AIS Type 8 — Binary Broadcast Message.
use crate::ais::armor::extract_u32;
/// AIS Type 8 — Binary Broadcast Message.
///
/// Broadcasts application-specific data identified by DAC and FID.
/// The `data` field contains raw bits (one byte per bit).
#[derive(Debug, Clone, PartialEq)]
pub struct BinaryBroadcast {
pub mmsi: u32,
/// Designated Area Code.
pub dac: u16,
/// Functional ID.
pub fid: u8,
/// Application-specific binary data (raw bits).
pub data: Vec<u8>,
}
impl BinaryBroadcast {
pub(crate) fn decode(bits: &[u8]) -> Option<Self> {
if bits.len() < 56 {
return None;
}
let mmsi = extract_u32(bits, 8, 30)?;
let dac = extract_u32(bits, 40, 10)? as u16;
let fid = extract_u32(bits, 50, 6)? as u8;
let data = if bits.len() > 56 {
bits[56..].to_vec()
} else {
Vec::new()
};
Some(Self {
mmsi,
dac,
fid,
data,
})
}
}