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#[derive(Debug, PartialEq, Eq, Clone)]
pub struct Identification {
pub callsign: ArrayString<252>,
pub ssid: u8,
pub fn new(call: &str, ssid: u8, icon: u16) -> Option<Self> {
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let callsign = ArrayString::from(call).ok()?;
Some(Self {
icon,
callsign,
ssid,
})
}
/// Returns none if there is not enough space in the buffer
pub fn encode<'a>(&self, buf: &'a mut [u8]) -> Option<&'a [u8]> {
// safe to unwrap because we know the length is <= 252
let len: u8 = self.callsign.as_bytes().len().try_into().unwrap();
*buf.get_mut(0)? = len + 3;
buf.get_mut(1..3)?.copy_from_slice(&self.icon.to_le_bytes());
let mut len = 3;
for (i, b) in self.callsign.as_bytes().iter().enumerate() {
*buf.get_mut(i + 3)? = *b;
len += 1
}
*buf.get_mut(len)? = self.ssid;
len += 1;
Some(&buf[0..len])
}
pub fn decode(data: &[u8]) -> Option<Self> {
let len = (*data.first()?).into();
let icon = u16::from_le_bytes([*data.get(1)?, *data.get(2)?]);
let callsign = core::str::from_utf8(data.get(3..len)?).ok()?;
let callsign = ArrayString::from(callsign).ok()?;
let ssid = *data.get(len)?;
Some(Self {
icon,
callsign,
ssid,
})
}
}