Use endpoint's max packet size for pipe.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/pipe/pck_size.rs b/src/pipe/pck_size.rs
index acc499f..c95140d 100644
--- a/src/pipe/pck_size.rs
+++ b/src/pipe/pck_size.rs
@@ -29,6 +29,16 @@ impl PckSize {
         f(&mut w);
         self.0 = w.bits;
     }
+
+    pub fn modify<F>(&mut self, f: F)
+    where
+        for<'w> F: FnOnce(&R, &'w mut W) -> &'w mut W,
+    {
+        let r = R { bits: self.0 };
+        let mut w = W { bits: self.0 };
+        f(&r, &mut w);
+        self.0 = w.bits;
+    }
 }
 
 impl From<u32> for PckSize {