Initial work on FFI

src/ffi/static_data/growth_rate.rs

@@ -0,0 +1,27 @@
+use crate::defines::LevelInt;
+use crate::ffi::{ExternPointer, OwnedPtr};
+use crate::static_data::{GrowthRate, LookupGrowthRate};
+use std::ptr::drop_in_place;
+
+#[no_mangle]
+unsafe extern "C" fn growth_rate_lookup_new(array: *const u32, length: usize) -> OwnedPtr<LookupGrowthRate> {
+    let array = std::slice::from_raw_parts(array, length);
+    Box::into_raw(Box::new(LookupGrowthRate::new(array.to_vec())))
+}
+
+#[no_mangle]
+unsafe extern "C" fn growth_rate_lookup_drop(ptr: OwnedPtr<LookupGrowthRate>) {
+    drop_in_place(ptr)
+}
+
+#[no_mangle]
+#[allow(improper_ctypes_definitions)]
+extern "C" fn growth_rate_calculate_level(ptr: ExternPointer<dyn GrowthRate>, experience: u32) -> LevelInt {
+    ptr.as_ref().calculate_level(experience)
+}
+
+#[no_mangle]
+#[allow(improper_ctypes_definitions)]
+extern "C" fn growth_rate_calculate_experience(ptr: ExternPointer<dyn GrowthRate>, level: LevelInt) -> u32 {
+    ptr.as_ref().calculate_experience(level)
+}