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, 6 insertions, 0 deletions

diff --git a/src/commands.rs b/src/commands.rs
index 99e049f..66851c1 100644
--- a/src/commands.rs
+++ b/src/commands.rs
@@ -34,6 +34,8 @@ struct GetStatusResponse {
     config_delete_user_password: u8,
 }
 
+assert_maximum_size!(GetStatusResponse; GetStatusResponse, crate::device::RESPONSE_DATA_LEN);
+
 #[derive(Debug, Default)]
 struct GetStatusCommand {}
 
@@ -53,11 +55,15 @@ struct ReadSlotNameRequest {
     internal_slot_number: u8,
 }
 
+assert_maximum_size!(ReadSlotNameRequest; ReadSlotNameRequest, crate::device::REQUEST_DATA_LEN);
+
 #[derive(Debug, Default, Serialize)]
 struct ReadSlotNameResponse {
     slot_name: [u8; 15],
 }
 
+assert_maximum_size!(ReadSlotNameResponse; ReadSlotNameResponse, crate::device::RESPONSE_DATA_LEN);
+
 #[derive(Debug, Default)]
 struct ReadSlotNameCommand {}