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use error::{ErrorKind, Result};
/// A trait for stopping serialization and deserialization when a certain limit has been reached.
pub trait SizeLimit {
/// Tells the SizeLimit that a certain number of bytes has been
/// read or written. Returns Err if the limit has been exceeded.
fn add(&mut self, n: u64) -> Result<()>;
/// Returns the hard limit (if one exists)
fn limit(&self) -> Option<u64>;
}
/// A SizeLimit that restricts serialized or deserialized messages from
/// exceeding a certain byte length.
#[derive(Copy, Clone)]
pub struct Bounded(pub u64);
/// A SizeLimit without a limit!
/// Use this if you don't care about the size of encoded or decoded messages.
#[derive(Copy, Clone)]
pub struct Infinite;
impl SizeLimit for Bounded {
#[inline(always)]
fn add(&mut self, n: u64) -> Result<()> {
if self.0 >= n {
self.0 -= n;
Ok(())
} else {
Err(Box::new(ErrorKind::SizeLimit))
}
}
#[inline(always)]
fn limit(&self) -> Option<u64> {
Some(self.0)
}
}
impl SizeLimit for Infinite {
#[inline(always)]
fn add(&mut self, _: u64) -> Result<()> {
Ok(())
}
#[inline(always)]
fn limit(&self) -> Option<u64> {
None
}
}
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