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|
use crate::{BOOL, FALSE, TRUE};
use std::cmp;
use std::io;
use std::ptr;
use windows_sys::Win32::Foundation::{CloseHandle, ERROR_IO_INCOMPLETE, ERROR_IO_PENDING, HANDLE};
use windows_sys::Win32::Storage::FileSystem::{ReadFile, WriteFile};
use windows_sys::Win32::System::IO::{GetOverlappedResult, OVERLAPPED};
#[derive(Debug)]
pub struct Handle(HANDLE);
unsafe impl Send for Handle {}
unsafe impl Sync for Handle {}
impl Handle {
pub fn new(handle: HANDLE) -> Handle {
Handle(handle)
}
pub fn raw(&self) -> HANDLE {
self.0
}
pub fn into_raw(self) -> HANDLE {
use std::mem;
let ret = self.0;
mem::forget(self);
ret
}
pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
let mut bytes = 0;
let len = cmp::min(buf.len(), <u32>::max_value() as usize) as u32;
crate::cvt(unsafe {
WriteFile(
self.0,
buf.as_ptr() as *const _,
len,
&mut bytes,
0 as *mut _,
)
})?;
Ok(bytes as usize)
}
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
let mut bytes = 0;
let len = cmp::min(buf.len(), <u32>::max_value() as usize) as u32;
crate::cvt(unsafe {
ReadFile(
self.0,
buf.as_mut_ptr() as *mut _,
len,
&mut bytes,
0 as *mut _,
)
})?;
Ok(bytes as usize)
}
pub unsafe fn read_overlapped(
&self,
buf: &mut [u8],
overlapped: *mut OVERLAPPED,
) -> io::Result<Option<usize>> {
self.read_overlapped_helper(buf, overlapped, FALSE)
}
pub unsafe fn read_overlapped_wait(
&self,
buf: &mut [u8],
overlapped: *mut OVERLAPPED,
) -> io::Result<usize> {
match self.read_overlapped_helper(buf, overlapped, TRUE) {
Ok(Some(bytes)) => Ok(bytes),
Ok(None) => panic!("logic error"),
Err(e) => Err(e),
}
}
pub unsafe fn read_overlapped_helper(
&self,
buf: &mut [u8],
overlapped: *mut OVERLAPPED,
wait: BOOL,
) -> io::Result<Option<usize>> {
let len = cmp::min(buf.len(), <u32>::max_value() as usize) as u32;
let res = crate::cvt({
ReadFile(
self.0,
buf.as_mut_ptr() as *mut _,
len,
ptr::null_mut(),
overlapped,
)
});
match res {
Ok(_) => (),
Err(ref e) if e.raw_os_error() == Some(ERROR_IO_PENDING as i32) => (),
Err(e) => return Err(e),
}
let mut bytes = 0;
let res = crate::cvt(GetOverlappedResult(self.0, overlapped, &mut bytes, wait));
match res {
Ok(_) => Ok(Some(bytes as usize)),
Err(ref e) if e.raw_os_error() == Some(ERROR_IO_INCOMPLETE as i32) && wait == FALSE => {
Ok(None)
}
Err(e) => Err(e),
}
}
pub unsafe fn write_overlapped(
&self,
buf: &[u8],
overlapped: *mut OVERLAPPED,
) -> io::Result<Option<usize>> {
self.write_overlapped_helper(buf, overlapped, FALSE)
}
pub unsafe fn write_overlapped_wait(
&self,
buf: &[u8],
overlapped: *mut OVERLAPPED,
) -> io::Result<usize> {
match self.write_overlapped_helper(buf, overlapped, TRUE) {
Ok(Some(bytes)) => Ok(bytes),
Ok(None) => panic!("logic error"),
Err(e) => Err(e),
}
}
unsafe fn write_overlapped_helper(
&self,
buf: &[u8],
overlapped: *mut OVERLAPPED,
wait: BOOL,
) -> io::Result<Option<usize>> {
let len = cmp::min(buf.len(), <u32>::max_value() as usize) as u32;
let res = crate::cvt({
WriteFile(
self.0,
buf.as_ptr() as *const _,
len,
ptr::null_mut(),
overlapped,
)
});
match res {
Ok(_) => (),
Err(ref e) if e.raw_os_error() == Some(ERROR_IO_PENDING as i32) => (),
Err(e) => return Err(e),
}
let mut bytes = 0;
let res = crate::cvt(GetOverlappedResult(self.0, overlapped, &mut bytes, wait));
match res {
Ok(_) => Ok(Some(bytes as usize)),
Err(ref e) if e.raw_os_error() == Some(ERROR_IO_INCOMPLETE as i32) && wait == FALSE => {
Ok(None)
}
Err(e) => Err(e),
}
}
}
impl Drop for Handle {
fn drop(&mut self) {
unsafe { CloseHandle(self.0) };
}
}
|
