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use crate::rr::{Address, AddressError};
use std::cmp::max;
use std::fmt::{Display, Formatter, Result as FmtResult};
#[derive(Debug, PartialEq, Clone, Eq, Hash)]
pub struct ECS {
source_prefix_length: u8,
scope_prefix_length: u8,
address: Address,
}
macro_rules! setter {
($(#[$doc_comment:meta])* $method:ident, $member:ident, $type:ident) => {
$(#[$doc_comment])*
pub fn $method(&mut self, new_value: $type) -> Result<(), AddressError> {
let previous = self.$member.clone();
self.$member = new_value;
match self.check_addr() {
Ok(()) => Ok(()),
Err(address_error) => {
self.$member = previous;
Err(address_error)
}
}
}
};
}
impl ECS {
fn check_addr(&self) -> Result<(), AddressError> {
let prefix_length = self.get_prefix_length();
self.address.check_prefix(prefix_length)
}
pub fn new(
source_prefix_length: u8,
scope_prefix_length: u8,
address: Address,
) -> Result<ECS, AddressError> {
let ecs = ECS {
source_prefix_length,
scope_prefix_length,
address,
};
ecs.check_addr()?;
Ok(ecs)
}
/// Returns the current source prefix length.
#[inline]
pub const fn get_source_prefix_length(&self) -> u8 {
self.source_prefix_length
}
setter!(
/// Try to set the source prefix length.
///
/// Returns `Ok()` if the length fit in the current address as network mask, otherwise
/// returns [`AddressError`] and the value is not changed.
///
/// [`AddressError`]: crate::rr::AddressError
set_source_prefix_length,
source_prefix_length,
u8
);
/// Returns the current scope prefix length.
#[inline]
pub const fn get_scope_prefix_length(&self) -> u8 {
self.scope_prefix_length
}
setter!(
/// Try to set the scope prefix length.
///
/// Returns `Ok()` if the length fit in the current address as network mask, otherwise
/// returns [`AddressError`] and the value is not changed.
///
/// [`AddressError`]: crate::rr::AddressError
set_scope_prefix_length,
scope_prefix_length,
u8
);
/// Returns the current address.
#[inline]
pub const fn get_address(&self) -> &Address {
&self.address
}
setter!(
/// Try to set the scope prefix length.
///
/// Returns `Ok()` if the current and scope prefix length fits in the new address as
/// network mask , otherwise returns [`AddressError`] and the value is not changed.
///
/// [`AddressError`]: crate::rr::AddressError
set_address,
address,
Address
);
/// Returns the prefix length of the address.
///
/// It the max value of the `source_prefix_length` and `scope_prefix_length`.
#[inline]
pub fn get_prefix_length(&self) -> u8 {
max(self.source_prefix_length, self.scope_prefix_length)
}
}
impl Display for ECS {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
write!(
f,
"ECS {} {} {}",
self.source_prefix_length, self.scope_prefix_length, self.address
)
}
}