bincode/config/
limit.rs

1use error::{ErrorKind, Result};
2
3/// A trait for stopping serialization and deserialization when a certain limit has been reached.
4pub trait SizeLimit {
5    /// Tells the SizeLimit that a certain number of bytes has been
6    /// read or written.  Returns Err if the limit has been exceeded.
7    fn add(&mut self, n: u64) -> Result<()>;
8    /// Returns the hard limit (if one exists)
9    fn limit(&self) -> Option<u64>;
10}
11
12/// A SizeLimit that restricts serialized or deserialized messages from
13/// exceeding a certain byte length.
14#[derive(Copy, Clone)]
15pub struct Bounded(pub u64);
16
17/// A SizeLimit without a limit!
18/// Use this if you don't care about the size of encoded or decoded messages.
19#[derive(Copy, Clone)]
20pub struct Infinite;
21
22impl SizeLimit for Bounded {
23    #[inline(always)]
24    fn add(&mut self, n: u64) -> Result<()> {
25        if self.0 >= n {
26            self.0 -= n;
27            Ok(())
28        } else {
29            Err(Box::new(ErrorKind::SizeLimit))
30        }
31    }
32
33    #[inline(always)]
34    fn limit(&self) -> Option<u64> {
35        Some(self.0)
36    }
37}
38
39impl SizeLimit for Infinite {
40    #[inline(always)]
41    fn add(&mut self, _: u64) -> Result<()> {
42        Ok(())
43    }
44
45    #[inline(always)]
46    fn limit(&self) -> Option<u64> {
47        None
48    }
49}
bincode/config/limit.rs

bincode/config/
limit.rs
