forked from lix-project/lix
34 lines
861 B
Rust
34 lines
861 B
Rust
/// A wrapper around Nix's Source class that provides the Read trait.
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#[repr(C)]
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pub struct Source {
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fun: extern "C" fn(this: *mut libc::c_void, data: &mut [u8]) -> usize,
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this: *mut libc::c_void,
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}
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impl std::io::Read for Source {
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fn read(&mut self, buf: &mut [u8]) -> std::result::Result<usize, std::io::Error> {
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let n = (self.fun)(self.this, buf);
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assert!(n <= buf.len());
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Ok(n)
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}
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}
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pub struct CBox<T> {
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pub ptr: *mut libc::c_void,
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phantom: std::marker::PhantomData<T>,
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}
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impl<T> CBox<T> {
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pub fn new(t: T) -> Self {
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unsafe {
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let size = std::mem::size_of::<T>();
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let ptr = libc::malloc(size);
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*(ptr as *mut T) = t; // FIXME: probably UB
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Self {
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ptr,
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phantom: std::marker::PhantomData,
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}
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}
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}
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}
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