dylink 0.5.0

Run-time dynamic linking loader utilities
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

// Copyright (c) 2023 Jonathan "Razordor" Alan Thomason

// The windows API conventions are kept deliberately, so it's easier to refer to references.
#![allow(clippy::upper_case_acronyms)]

use super::DefaultLinker;
use crate::LibHandle;
use std::ffi;
use std::os::windows::raw::HANDLE;

pub type HMODULE = HANDLE;
pub type PCSTR = *const ffi::c_char;
pub type PCWSTR = *const u16;
pub const LOAD_LIBRARY_SEARCH_DEFAULT_DIRS: u32 = 4096u32;
extern "system" {
	pub fn LoadLibraryExW(lplibfilename: PCWSTR, hfile: HANDLE, dwflags: u32) -> HMODULE;
	pub fn GetProcAddress(hmodule: HMODULE, lpprocname: PCSTR) -> Option<crate::FnPtr>;
}

impl crate::RTLinker for DefaultLinker {
	fn load_lib(lib_name: &ffi::CStr) -> LibHandle {
		let wide_str: Vec<u16> = lib_name
			.to_string_lossy()
			.encode_utf16()
			.chain(std::iter::once(0u16))
			.collect();
		let result = unsafe {
			// miri hates this function, but it works fine.
			LoadLibraryExW(
				wide_str.as_ptr().cast(),
				std::ptr::null_mut(),
				LOAD_LIBRARY_SEARCH_DEFAULT_DIRS,
			)
		};
		LibHandle(result)
	}
	fn load_sym(lib_handle: &LibHandle, fn_name: &ffi::CStr) -> Option<crate::FnPtr> {
		unsafe { GetProcAddress(lib_handle.0.cast_mut(), fn_name.as_ptr().cast()) }
	}
}