added C and Python bindings

src/ffi.rs

@@ -0,0 +1,43 @@
+use std::ffi::{c_char, c_double, c_uchar, CStr};
+
+use crate::Onod;
+
+#[no_mangle]
+pub extern "C" fn onod_run(
+    test: *const c_char,
+    samples: *const c_uchar,
+    len: usize,
+    result: *mut c_double,
+) -> bool {
+    // Check for null pointers
+    if test.is_null() || samples.is_null() || result.is_null() {
+        eprintln!("Error: Null pointer passed to onod_run.");
+        return false;
+    }
+
+    // Convert C string to Rust string
+    let test = unsafe {
+        match CStr::from_ptr(test).to_str() {
+            Ok(s) => s,
+            Err(_) => {
+                eprintln!("Error: Invalid UTF-8 string passed to onod_run.");
+                return false;
+            }
+        }
+    };
+
+    // Convert samples to a Rust slice
+    let samples = unsafe { std::slice::from_raw_parts(samples, len as usize) };
+
+    // Call the Rust `run` function
+    let (obs, z, p) = Onod::run(test, samples);
+
+    // Write results to the output buffer
+    unsafe {
+        *result.offset(0) = obs;
+        *result.offset(1) = z;
+        *result.offset(2) = p;
+    }
+
+    true
+}