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-rw-r--r--src/buf/buf_mut.rs4
-rw-r--r--src/buf/chain.rs3
2 files changed, 5 insertions, 2 deletions
diff --git a/src/buf/buf_mut.rs b/src/buf/buf_mut.rs
index 4c2bd2c..7f67f7b 100644
--- a/src/buf/buf_mut.rs
+++ b/src/buf/buf_mut.rs
@@ -56,6 +56,10 @@ pub unsafe trait BufMut {
/// Implementations of `remaining_mut` should ensure that the return value
/// does not change unless a call is made to `advance_mut` or any other
/// function that is documented to change the `BufMut`'s current position.
+ ///
+ /// # Note
+ ///
+ /// `remaining_mut` may return value smaller than actual available space.
fn remaining_mut(&self) -> usize;
/// Advance the internal cursor of the BufMut
diff --git a/src/buf/chain.rs b/src/buf/chain.rs
index 9ce5f23..78979a1 100644
--- a/src/buf/chain.rs
+++ b/src/buf/chain.rs
@@ -198,8 +198,7 @@ where
fn remaining_mut(&self) -> usize {
self.a
.remaining_mut()
- .checked_add(self.b.remaining_mut())
- .unwrap()
+ .saturating_add(self.b.remaining_mut())
}
fn chunk_mut(&mut self) -> &mut UninitSlice {