Vincent Herlemont
87 lines
2.5 KiB
Rust
87 lines
2.5 KiB
Rust
use crate::header::Header;
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use zerocopy::little_endian::U32;
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use zerocopy::{AsBytes, ByteSlice, ByteSliceMut, Ref};
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#[derive(Debug)]
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pub struct Wrapper<T: ByteSlice> {
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header: Ref<T, Header>, // Deprecated: Rename LayoutVerified to Ref #203
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value: T,
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}
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impl<T: ByteSlice> Wrapper<T> {
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pub fn deserialize(packed: T) -> Option<Self> {
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let (header_lv, rest) = Ref::<_, Header>::new_from_prefix(packed)?;
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let native_model = Self {
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header: header_lv,
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value: rest,
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};
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Some(native_model)
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}
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pub fn value(&self) -> &T {
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&self.value
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}
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pub fn get_type_id(&self) -> u32 {
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self.header.type_id.get()
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}
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pub fn get_version(&self) -> u32 {
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self.header.version.get()
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}
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}
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impl<T: ByteSliceMut> Wrapper<T> {
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pub fn set_type_id(&mut self, type_id: u32) {
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self.header.type_id = U32::new(type_id);
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}
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pub fn set_version(&mut self, version: u32) {
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self.header.version = U32::new(version);
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}
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}
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pub fn native_model_encode(value: &mut Vec<u8>, type_id: u32, version: u32) {
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let header = Header {
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type_id: U32::new(type_id),
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version: U32::new(version),
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};
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let header = header.as_bytes();
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value.reserve(header.len());
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value.splice(..0, header.iter().cloned());
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// Try to do with unsafe code to improve performance but benchmark shows that it's the same
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//
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// // Add header to the beginning of the vector
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// unsafe {
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// // get the raw pointer to the vector's buffer
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// let ptr = value.as_mut_ptr();
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//
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// // move the existing elements to the right
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// ptr.offset(header.len() as isize)
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// .copy_from_nonoverlapping(ptr, value.len());
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//
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// // copy the elements from the header to the beginning of the vector
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// ptr.copy_from_nonoverlapping(header.as_ptr(), header.len());
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//
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// // update the length of the vector
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// value.set_len(value.len() + header.len());
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// }
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}
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#[cfg(test)]
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mod tests {
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use crate::{native_model_encode, Wrapper};
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#[test]
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fn native_model_deserialize_with_body() {
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let mut data = vec![0u8; 8];
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native_model_encode(&mut data, 200000, 100000);
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assert_eq!(data.len(), 16);
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let model = Wrapper::deserialize(&data[..]).unwrap();
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assert_eq!(model.get_type_id(), 200000);
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assert_eq!(model.get_version(), 100000);
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assert_eq!(model.value().len(), 8);
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}
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}
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