Assert maximum size for command request and response structs

The request and response structs for a command should not be bigger than
the buffer they are read from or written to.  Therefore we add
assertions that enforce this property at compile time.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/util.rs b/src/util.rs
index c86d047..7b12afb 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -77,6 +77,15 @@ macro_rules! enum_u8 {
     };
 }
 
+macro_rules! assert_maximum_size {
+    ($i:ident; $t:ident, $e: expr) => {
+        ::static_assertions::const_assert!(
+            $i;
+            ::core::mem::size_of::<$t>() <= $e
+        );
+    }
+}
+
 pub trait TryFrom<T>: Sized {
     fn try_from(val: T) -> Result<Self, ()>;
 }