15 lines
426 B
Rust
15 lines
426 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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