add files

build.rs

@@ -0,0 +1,43 @@
+use std::{
+    env,
+    fs,
+    io,
+    path::{Path, PathBuf},
+};
+
+fn main() -> io::Result<()> {
+    let manifest_dir =
+        PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR not set"));
+    let dll_source_dir = manifest_dir.join("open_wrapper").join("lib");
+
+    if !dll_source_dir.exists() {
+        println!(
+            "cargo:warning=DLL source directory '{}' not found. Skipping copy.",
+            dll_source_dir.display()
+        );
+        return Ok(());
+    }
+
+    let out_dir = PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR not set"));
+    // OUT_DIR = target/{profile}/build/<pkg>/out
+    let profile_dir = out_dir
+        .ancestors()
+        .nth(3)
+        .expect("Unable to compute profile dir from OUT_DIR");
+
+    let dest_dir = Path::new(profile_dir);
+    fs::create_dir_all(&dest_dir)?;
+
+    for entry in fs::read_dir(&dll_source_dir)? {
+        let entry = entry?;
+        let path = entry.path();
+        if path.extension().map_or(false, |ext| ext.eq_ignore_ascii_case("dll")) {
+            let file_name = entry.file_name();
+            let dest_path = dest_dir.join(&file_name);
+            fs::copy(&path, &dest_path)?;
+        }
+        println!("cargo:rerun-if-changed={}", path.display());
+    }
+
+    Ok(())
+}