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// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
// All files in the project carrying such notice may not be copied, modified, or distributed
// except according to those terms.
//! Wrapping and automatically closing Internet handles. Copy-pasted from
//! [comedy-rs](https://github.com/agashlin/comedy-rs/blob/c244b91e9237c887f6a7bc6cd03db98b51966494/src/handle.rs).
use winapi::shared::minwindef::DWORD;
use winapi::shared::ntdef::NULL;
use winapi::um::errhandlingapi::GetLastError;
use winapi::um::wininet::{InternetCloseHandle, HINTERNET};
/// Check and automatically close a Windows `HINTERNET`.
#[repr(transparent)]
#[derive(Debug)]
pub struct InternetHandle(HINTERNET);
impl InternetHandle {
/// Take ownership of a `HINTERNET`, which will be closed with `InternetCloseHandle` upon drop.
/// Returns an error in case of `NULL`.
///
/// # Safety
///
/// `h` should be the only copy of the handle. `GetLastError()` is called to
/// return an error, so the last Windows API called on this thread should have been
/// what produced the invalid handle.
pub unsafe fn new(h: HINTERNET) -> Result<InternetHandle, DWORD> {
if h == NULL {
Err(GetLastError())
} else {
Ok(InternetHandle(h))
}
}
/// Obtains the raw `HINTERNET` without transferring ownership.
///
/// Do __not__ close this handle because it is still owned by the `InternetHandle`.
///
/// Do __not__ use this handle beyond the lifetime of the `InternetHandle`.
pub fn as_raw(&self) -> HINTERNET {
self.0
}
}
impl Drop for InternetHandle {
fn drop(&mut self) {
unsafe {
InternetCloseHandle(self.0);
}
}
}
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