Fix Cidr::contains_addr for zero length prefixes.
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@ -109,6 +109,9 @@ impl Cidr {
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/// Query whether the subnetwork described by this IPv4 CIDR block contains
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/// the given address.
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pub fn contains_addr(&self, addr: &Address) -> bool {
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// right shift by 32 is not legal
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if self.prefix_len == 0 { return true }
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let shift = 32 - self.prefix_len;
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let self_prefix = NetworkEndian::read_u32(self.address.as_bytes()) >> shift;
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let addr_prefix = NetworkEndian::read_u32(addr.as_bytes()) >> shift;
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@ -832,5 +835,8 @@ mod test {
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|&(a, p)| Cidr::new(Address::new(a[0], a[1], a[2], a[3]), p)) {
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assert!(!cidr.contains_subnet(&subnet));
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}
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let cidr_without_prefix = Cidr::new(cidr.address(), 0);
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assert!(cidr_without_prefix.contains_addr(&Address::new(127, 0, 0, 1)));
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}
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}
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