1 files changed, 20 insertions, 4 deletions
diff --git a/lib/core_functions.ml b/lib/core_functions.ml
index 083e0cf..059cd14 100644
--- a/lib/core_functions.ml
+++ b/lib/core_functions.ml
@@ -1,11 +1,27 @@
+(* open Ctypes *)
+
 module Types = Types_generated
 
 module Functions (F : Ctypes.FOREIGN) = struct
-  open F
+  (* open F *)
+  open Ctypes_static
+
+  let os_extension =
+    if Sys.os_type = "Unix" then
+      let ic = Unix.open_process_in "uname" in
+      let uname = input_line ic in
+      let () = close_in ic in
+      if uname = "Darwin" then "dylib" else "so"
+    else "dll"
+
+  let libmerklecpp =
+    Dl.dlopen ~flags:[ RTLD_GLOBAL; RTLD_NOW ]
+      ~filename:
+        (Sys.getenv "LIBRELATIONAL_ENGINE_LIB_PATH"
+        ^ "/librelational_engine." ^ os_extension)
 
   let compute_hash =
-    foreign "compute_hash"
-      (F.(@->) (Ctypes.ptr Ctypes.char)
-         (F.(@->) Ctypes.string (F.returning Ctypes.void)))
+    Foreign.foreign ~from:libmerklecpp "compute_hash"
+      (ptr char @-> Ctypes.string @-> returning void)
 
 end