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use super::super::super::windows::*;
use super::mystd::fs::File;
use super::mystd::os::windows::prelude::*;
use core::ops::Deref;
use core::ptr;
use core::slice;
pub struct Mmap {
// keep the file alive to prevent it from ebeing deleted which would cause
// us to read bad data.
_file: File,
ptr: *mut c_void,
len: usize,
}
impl Mmap {
pub unsafe fn map(file: &File, len: usize) -> Option<Mmap> {
let file = file.try_clone().ok()?;
let mapping = CreateFileMappingA(
file.as_raw_handle() as *mut _,
ptr::null_mut(),
PAGE_READONLY,
0,
0,
ptr::null(),
);
if mapping.is_null() {
return None;
}
let ptr = MapViewOfFile(mapping, FILE_MAP_READ, 0, 0, len);
CloseHandle(mapping);
if ptr.is_null() {
return None;
}
Some(Mmap {
_file: file,
ptr,
len,
})
}
}
impl Deref for Mmap {
type Target = [u8];
fn deref(&self) -> &[u8] {
unsafe { slice::from_raw_parts(self.ptr as *const u8, self.len) }
}
}
impl Drop for Mmap {
fn drop(&mut self) {
unsafe {
let r = UnmapViewOfFile(self.ptr);
debug_assert!(r != 0);
}
}
}
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