1//! Library loading routines.
2
3use std::ops::{Deref, DerefMut};
4use std::sync::Arc;
5
6use libloading::Library;
7
8#[cfg(windows)]
9use libloading::os::windows::{Library as WinLibrary, LOAD_LIBRARY_SEARCH_DEFAULT_DIRS};
10
11pub trait SymLoading {
12 /// # Safety
13 /// The library must be unsured to live long enough.
14 unsafe fn load_with(lib: &Library) -> Self;
15}
16
17#[derive(Clone)]
18#[allow(missing_debug_implementations)]
19pub struct SymWrapper<T> {
20 sym: T,
21 _lib: Arc<Library>,
22}
23
24impl<T: SymLoading> SymWrapper<T> {
25 pub unsafe fn new(lib_paths: &[&str]) -> Result<Self, ()> {
26 unsafe {
27 for path: &&str in lib_paths {
28 #[cfg(windows)]
29 let lib = WinLibrary::load_with_flags(path, LOAD_LIBRARY_SEARCH_DEFAULT_DIRS)
30 .map(From::from);
31
32 #[cfg(not(windows))]
33 let lib: Result = Library::new(filename:path);
34
35 if let Ok(lib: Library) = lib {
36 return Ok(SymWrapper { sym: T::load_with(&lib), _lib: Arc::new(data:lib) });
37 }
38 }
39 }
40
41 Err(())
42 }
43}
44
45impl<T> Deref for SymWrapper<T> {
46 type Target = T;
47
48 fn deref(&self) -> &Self::Target {
49 &self.sym
50 }
51}
52
53impl<T> DerefMut for SymWrapper<T> {
54 fn deref_mut(&mut self) -> &mut Self::Target {
55 &mut self.sym
56 }
57}
58