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// Copyright 2024 Gabriel Bjørnager Jensen.
//
// This file is part of bzipper.
//
// bzipper is free software: you can redistribute
// it and/or modify it under the terms of the GNU
// Lesser General Public License as published by
// the Free Software Foundation, either version 3
// of the License, or (at your option) any later
// version.
//
// bzipper is distributed in the hope that it will
// be useful, but WITHOUT ANY WARRANTY; without
// even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Less-
// er General Public License along with bzipper. If
// not, see <https://www.gnu.org/licenses/>.
#[cfg(test)]
mod test;
use crate::SStream;
use std::convert::Infallible;
use std::mem::size_of;
use std::num::NonZero;
/// Denotes a type capable of being serialised.
pub trait Serialise: Sized {
/// Serialises `self` into a byte stream.
///
/// One may assume that the resulting stream has at most the same ammount of bytes as before serialisation.
/// Therefore, not observing this rule is a logic error.
fn serialise(&self, stream: &mut SStream);
}
macro_rules! impl_float {
($type:ty) => {
impl Serialise for $type {
fn serialise(&self, stream: &mut SStream) {
stream.append(&self.to_be_bytes())
}
}
};
}
macro_rules! impl_int {
($type:ty) => {
impl Serialise for $type {
fn serialise(&self, stream: &mut SStream) {
stream.append(&self.to_be_bytes())
}
}
impl Serialise for NonZero<$type> {
fn serialise(&self, stream: &mut SStream) {
self.get().serialise(stream)
}
}
};
}
impl<T: Serialise, const N: usize> Serialise for [T; N] {
fn serialise(&self, stream: &mut SStream) {
u64::try_from(self.len()).unwrap().serialise(stream);
for v in self { v.serialise(stream) }
}
}
impl Serialise for () {
fn serialise(&self, _stream: &mut SStream) { }
}
impl Serialise for bool {
fn serialise(&self, stream: &mut SStream) {
u8::from(*self).serialise(stream)
}
}
impl Serialise for char {
fn serialise(&self, stream: &mut SStream) {
u32::from(*self).serialise(stream)
}
}
impl Serialise for Infallible {
fn serialise(&self, _stream: &mut SStream) { unreachable!() }
}
impl<T: Serialise> Serialise for Option<T> {
fn serialise(&self, stream: &mut SStream) {
match *self {
None => {
stream.append(&[0x00]);
stream.append(&vec![0x00; size_of::<T>()]);
},
Some(ref v) => {
stream.append(&[0x01]);
v.serialise(stream);
},
};
}
}
impl<T: Serialise, E: Serialise> Serialise for Result<T, E> {
fn serialise(&self, stream: &mut SStream) {
match *self {
Ok(ref v) => {
stream.append(&[0x00]);
v.serialise(stream);
},
Err(ref e) => {
stream.append(&[0x01]);
e.serialise(stream);
},
};
}
}
impl_float!(f32);
impl_float!(f64);
impl_int!(i128);
impl_int!(i16);
impl_int!(i32);
impl_int!(i64);
impl_int!(i8);
impl_int!(u128);
impl_int!(u16);
impl_int!(u32);
impl_int!(u64);
impl_int!(u8);
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