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#[cfg(unix)] mod internal_impl {
use std::os::raw;
use std::ffi::OsStr;
use super::cstr_cow_from_bytes;
extern {
fn dlopen(filename: *const raw::c_char, flags: raw::c_int) -> *mut raw::c_void;
fn dlsym(handle: *mut raw::c_void, symbol: *const raw::c_char) -> *mut raw::c_void;
fn dlclose(handle: *mut raw::c_void) -> raw::c_int;
fn dlerror() -> *mut raw::c_char;
}
#[cfg(not(target_os="android"))]
const RTLD_NOW: raw::c_int = 2;
#[cfg(target_os="android")]
const RTLD_NOW: raw::c_int = 0;
pub struct Library(*mut raw::c_void);
unsafe impl Send for Library {}
unsafe impl Sync for Library {}
impl Library {
pub fn new<P: AsRef<OsStr>>(path: P) -> Option<Self> {
use std::os::unix::ffi::OsStrExt;
let file_path = cstr_cow_from_bytes(path.as_ref().as_bytes())?;
let result = unsafe { dlopen(file_path.as_ptr(), RTLD_NOW) };
if result.is_null() {
#[cfg(feature = "debug_symbols")] {
println!("failed to dlopen library in path {}", path.as_ref().to_string_lossy());
}
None
} else {
#[cfg(feature = "debug_symbols")] {
println!("dlopen library in path {} @ 0x{:x}", path.as_ref().to_string_lossy(), result as usize);
}
Some(Library(result))
}
}
pub fn get(&self, symbol: &[u8]) -> Option<*mut raw::c_void> {
let symbol_name_new = cstr_cow_from_bytes(symbol)?;
let symbol_new = unsafe { dlsym(self.0, symbol_name_new.as_ptr()) };
let error = unsafe { dlerror() };
if error.is_null() {
#[cfg(feature = "debug_symbols")] {
println!("ok loaded symbol {} @ 0x{:x}", unsafe { std::str::from_utf8_unchecked(symbol) }, symbol_new as usize);
}
Some(symbol_new)
} else {
#[cfg(feature = "debug_symbols")] {
println!("missing symbol {} @ 0x{:x}", unsafe { std::str::from_utf8_unchecked(symbol) }, symbol_new as usize);
}
None
}
}
}
impl Drop for Library {
fn drop(&mut self) {
unsafe { dlclose(self.0) };
}
}
}
#[cfg(windows)] mod internal_impl {
extern crate winapi;
use self::winapi::shared::minwindef::{HMODULE, FARPROC};
use self::winapi::um::libloaderapi;
use super::cstr_cow_from_bytes;
use std::ffi::OsStr;
pub struct Library(HMODULE);
unsafe impl Send for Library {}
unsafe impl Sync for Library {}
impl Library {
pub fn new<P: AsRef<OsStr>>(path: P) -> Option<Self> {
use std::os::windows::ffi::OsStrExt;
let wide_filename: Vec<u16> = path.as_ref().encode_wide().chain(Some(0)).collect();
let handle = unsafe { libloaderapi::LoadLibraryExW(wide_filename.as_ptr(), std::ptr::null_mut(), 0) };
if handle.is_null() { None } else { Some(Library(handle)) }
}
pub fn get(&self, symbol: &[u8]) -> Option<FARPROC> {
let symbol = cstr_cow_from_bytes(symbol)?;
let symbol = unsafe { libloaderapi::GetProcAddress(self.0, symbol.as_ptr()) };
if symbol.is_null() { None } else { Some(symbol) }
}
}
impl Drop for Library {
fn drop(&mut self) {
unsafe { libloaderapi::FreeLibrary(self.0); }
}
}
}
use std::ffi::{CStr, CString};
use std::borrow::Cow;
use std::os::raw;
pub(crate) fn cstr_cow_from_bytes<'a>(slice: &'a [u8]) -> Option<Cow<'a, CStr>> {
static ZERO: raw::c_char = 0;
Some(match slice.last() {
None => unsafe { Cow::Borrowed(CStr::from_ptr(&ZERO)) },
Some(&0) => {
Cow::Borrowed(CStr::from_bytes_with_nul(slice).ok()?)
},
Some(_) => Cow::Owned(CString::new(slice).ok()?),
})
}
pub use internal_impl::Library;