Minor cleanup of the CnC version check

src/client/cnc_descriptor.rs

@@ -60,9 +60,12 @@ pub struct MetaDataDefinition {
     _pid: i64,
 }
 
+/// Version code for the Aeron CnC file format
+pub const CNC_VERSION: i32 = crate::sematic_version_compose(0, 0, 16);
+
 #[cfg(test)]
 mod tests {
-    use crate::client::cnc_descriptor::MetaDataDefinition;
+    use crate::client::cnc_descriptor::{MetaDataDefinition, CNC_VERSION};
     use crate::driver::{DriverContext, MediaDriver};
     use memmap::MmapOptions;
     use std::fs::File;
@@ -87,6 +90,6 @@ mod tests {
         };
 
         let metadata: &MetaDataDefinition = unsafe { &*(mmap.as_ptr().cast()) };
-        assert_eq!(metadata.cnc_version, 16);
+        assert_eq!(metadata.cnc_version, CNC_VERSION);
     }
 }

src/lib.rs

@@ -4,3 +4,17 @@
 pub mod client;
 pub mod control_protocol;
 pub mod driver;
+
+const fn sematic_version_compose(major: u8, minor: u8, patch: u8) -> i32 {
+    (major as i32) << 16 | (minor as i32) << 8 | (patch as i32)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::sematic_version_compose;
+
+    #[test]
+    fn version_compose_cnc() {
+        assert_eq!(sematic_version_compose(0, 0, 16), 16);
+    }
+}