173c0e5ac5
The `data` crate is intended to be used as the manifest serialization
and deserialization format.
This blog post describes the motivation and goals for this crate:
https://rodarmor.com/blog/data
type: added
37 lines
870 B
Rust
37 lines
870 B
Rust
use crate::common::*;
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pub(crate) struct Buffer {
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layout: Layout,
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alloc: *mut u8,
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}
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impl Buffer {
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pub(crate) fn new<'a, T: Data<'a>>(contents: &[u8]) -> Buffer {
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let layout = Layout::from_size_align(T::FIXED_SIZE, T::ALIGNMENT).unwrap();
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let alloc = unsafe { alloc::alloc::alloc_zeroed(layout) };
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let mut buffer = Buffer { layout, alloc };
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buffer.deref_mut().copy_from_slice(contents);
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buffer
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}
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}
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impl Drop for Buffer {
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fn drop(&mut self) {
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unsafe { alloc::alloc::dealloc(self.alloc, self.layout) };
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}
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}
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impl Deref for Buffer {
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type Target = [u8];
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fn deref(&self) -> &Self::Target {
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unsafe { core::slice::from_raw_parts(self.alloc, self.layout.size()) }
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}
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}
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impl DerefMut for Buffer {
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fn deref_mut(&mut self) -> &mut Self::Target {
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unsafe { core::slice::from_raw_parts_mut(self.alloc, self.layout.size()) }
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}
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}
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