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pub fn to_bytes<T: std::marker::Copy>(data: T) -> Vec<u8> {
let len = std::mem::size_of::<T>();
let mut result: Vec<u8> = vec![0; len];
unsafe {
std::ptr::copy_nonoverlapping(&data as *const _ as *const u8, result.as_mut_ptr(), len);
}
result
}
pub unsafe trait ToBytesCast {
fn to_bytes(&self) -> Vec<u8>;
}
macro_rules! impl_to_traits
{
($($t:ty), +) => {
$(
unsafe impl ToBytesCast for $t {
#[inline]
fn to_bytes(&self) -> Vec<u8> {
to_bytes(*self)
}
}
)+
};
}
impl_to_traits!(u32, u16, u8, usize, i32, i16, i8, isize, f32, f64);
pub unsafe fn bytes_cast_lazy<T: std::marker::Copy>(bytes: &[u8]) -> T {
let len = std::mem::size_of::<T>();
let mut result: T = std::mem::uninitialized();
std::ptr::copy_nonoverlapping(bytes.as_ptr(), &mut result as *mut _ as *mut u8, len);
result
}
pub fn bytes_cast<T: ToBytesCast>(bytes: &[u8]) -> Result<T, String> {
let len = std::mem::size_of::<T>();
if bytes.len() < len {
return Err("Bytes size is insufficient for a cast".to_string());
}
let mut result: T = unsafe {std::mem::uninitialized()};
unsafe {
std::ptr::copy_nonoverlapping(bytes.as_ptr(), &mut result as *mut _ as *mut u8, len);
}
Ok(result)
}
pub unsafe trait FromBytesCast<T: ToBytesCast> {
fn cast_to(&self) -> Result<T, String>;
}
unsafe impl<T: ToBytesCast> FromBytesCast<T> for [u8] {
#[inline]
fn cast_to(&self) -> Result<T, String> {
bytes_cast(self)
}
}
unsafe impl<'a, T: ToBytesCast> FromBytesCast<T> for &'a[u8] {
#[inline]
fn cast_to(&self) -> Result<T, String> {
bytes_cast(self)
}
}