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ch8/ch8-mac: Clear Unicast/Multicast bit #101

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ch8/ch8-mac: Clear Unicast/Multicast bit #101

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12 changes: 10 additions & 2 deletions ch8/ch8-mac/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,11 +19,19 @@ impl Display for MacAddress {
}
}

// MAC address format summary:
// https://en.wikipedia.org/wiki/MAC_address#Address_details
//
// 1st Octet:
// -- bit 0 (LSB): 0 = unicast / 1 = multicast
// -- bit 1: 0 = globally unique OUI / 1 = locally assigned
//
impl MacAddress {
fn new() -> MacAddress {
let mut octets: [u8; 6] = [0; 6];
rand::thread_rng().fill_bytes(&mut octets);
octets[0] |= 0b_0000_0011; // <3>
octets[0] |= 0b_0000_0010; // <3>
octets[0] &= 0b_1111_1110; // <3>
MacAddress { 0: octets }
}

Expand All @@ -32,7 +40,7 @@ impl MacAddress {
}

fn is_unicast(&self) -> bool {
(self.0[0] & 0b_0000_0001) == 0b_0000_0001
(self.0[0] & 0b_0000_0001) == 0b_0000_0000
}
}

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