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