15 files changed, 921 insertions, 0 deletions
diff --git a/src/checksum/mod.rs b/src/checksum/mod.rs
new file mode 100644
index 0000000..1dbf62c
--- /dev/null
+++ b/src/checksum/mod.rs
@@ -0,0 +1,58 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::deserialise::{Deserialise, DStream};
+use crate::serialise::{SStream, Serialise};
+
+use sha2::{Digest, Sha256};
+use std::fmt::{Debug, Display, Formatter};
+
+#[derive(Clone, Eq, PartialEq)]
+#[repr(transparent)]
+pub struct Checksum(pub(in super) [u8; 0x20]);
+
+impl Checksum {
+	#[must_use]
+	pub fn new<T: Serialise>(data: &T) -> Self {
+		let data = SStream::from(data);
+
+		let mut hasher = Sha256::new();
+		hasher.update(data);
+
+		Self(hasher.finalize().into())
+	}
+}
+
+impl Debug for Checksum {
+	#[inline(always)]
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result { Display::fmt(self, f) }
+}
+
+impl Deserialise for Checksum {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn std::error::Error>> {
+		let data = Deserialise::deserialise(stream)?;
+
+		Ok(Self(data))
+	}
+}
+
+impl Display for Checksum {
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+		write!(f,
+			"{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}",
+			self.0[0x1F], self.0[0x1E], self.0[0x1D], self.0[0x1C],
+			self.0[0x1B], self.0[0x1A], self.0[0x19], self.0[0x18],
+			self.0[0x17], self.0[0x16], self.0[0x15], self.0[0x14],
+			self.0[0x13], self.0[0x12], self.0[0x11], self.0[0x10],
+			self.0[0x0F], self.0[0x0E], self.0[0x0D], self.0[0x0C],
+			self.0[0x0B], self.0[0x0A], self.0[0x09], self.0[0x08],
+			self.0[0x07], self.0[0x06], self.0[0x05], self.0[0x04],
+			self.0[0x03], self.0[0x02], self.0[0x01], self.0[0x00],
+		)
+	}
+}
+
+impl Serialise for Checksum {
+	fn serialise(&self, stream: &mut SStream) {
+		self.0.serialise(stream);
+	}
+}
diff --git a/src/deserialise/d_stream/mod.rs b/src/deserialise/d_stream/mod.rs
new file mode 100644
index 0000000..05ed6a2
--- /dev/null
+++ b/src/deserialise/d_stream/mod.rs
@@ -0,0 +1,53 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::error::{Error, Result};
+
+use std::fmt::{Debug, Formatter};
+
+#[derive(Clone)]
+pub struct DStream<'a> {
+	data: &'a [u8],
+	len:  usize,
+}
+
+impl DStream<'_> {
+	pub fn take(&mut self, len: usize) -> Result<&[u8]> {
+		if self.len < len { return Err(Error::EndOfDStream { len: self.len, ok_len: len } ) }
+
+		let start = self.data.len() - self.len;
+		let stop  = start + len;
+
+		self.len -= len;
+
+		Ok(&self.data[start..stop])
+	}
+}
+
+impl Debug for DStream<'_> {
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+		let stop  = self.data.len();
+		let start = self.data.len() - self.len;
+
+		write!(f, "[")?;
+
+		for v in &self.data[start..stop] { write!(f, "{v:#02X},")? };
+
+		write!(f, "]")?;
+
+		Ok(())
+	}
+}
+
+impl<'a> From<&'a [u8]> for DStream<'a> {
+	fn from(value: &'a [u8]) -> Self { Self {
+		data: value,
+		len:  value.len(),
+	} }
+}
+
+impl<'a, const N: usize> From<&'a [u8; N]> for DStream<'a> {
+	fn from(value: &'a [u8; N]) -> Self { Self {
+		data: value,
+		len:  N,
+	} }
+}
diff --git a/src/deserialise/deserialise/mod.rs b/src/deserialise/deserialise/mod.rs
new file mode 100644
index 0000000..a51ec18
--- /dev/null
+++ b/src/deserialise/deserialise/mod.rs
@@ -0,0 +1,133 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::deserialise::DStream;
+use crate::error::Error;
+
+use std::convert::Infallible;
+use std::error::Error as StdError;
+use std::mem::size_of;
+use std::num::NonZero;
+
+pub trait Deserialise: Sized {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn StdError>>;
+}
+
+macro_rules! impl_float {
+	($type:ty) => {
+		impl Deserialise for $type {
+			fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn StdError>> {
+				let data = stream
+					.take(size_of::<Self>())?
+					.try_into()
+					.unwrap();
+
+				Ok(Self::from_be_bytes(data))
+			}
+		}
+	};
+}
+
+macro_rules! impl_int {
+	($type:ty) => {
+		impl Deserialise for $type {
+			fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn StdError>> {
+				let data = stream
+					.take(size_of::<Self>())?
+					.try_into()
+					.unwrap();
+
+				Ok(Self::from_be_bytes(data))
+			}
+		}
+
+		impl Deserialise for NonZero<$type> {
+			fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn StdError>> {
+				Ok(Option::<Self>::deserialise(stream)?
+					.ok_or(Error::NullInteger)?)
+			}
+		}
+	};
+}
+
+impl<T: Deserialise, const N: usize> Deserialise for [T; N] {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn StdError>> {
+		let len = usize::try_from(u64::deserialise(stream)?).unwrap();
+		if len != N { return Err(Box::new(Error::ArrayLengthMismatch { len, ok_len: N })) };
+
+		let mut buf = Vec::with_capacity(len);
+		for _ in 0x0..len { buf.push(Deserialise::deserialise(stream)?); }
+
+		// If we had used the checked unwrap, we would also
+		// have to require `T: Debug`.
+		Ok(unsafe { buf.try_into().unwrap_unchecked() })
+	}
+}
+
+impl Deserialise for () {
+	fn deserialise(_stream: &mut DStream) -> Result<Self, Box<dyn StdError>> { Ok(()) }
+}
+
+impl Deserialise for bool {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn StdError>> {
+		let value = u8::deserialise(stream)?;
+
+		match value {
+			0x00 => Ok(false),
+			0x01 => Ok(true),
+			_    => Err(Box::new(Error::InvalidBoolean { value }))
+		}
+	}
+}
+
+impl Deserialise for char {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn StdError>> {
+		let value = u32::deserialise(stream)?;
+
+		Self::from_u32(value)
+			.ok_or(Box::new(Error::InvalidCodePoint { value }))
+	}
+}
+
+impl Deserialise for Infallible {
+	fn deserialise(_stream: &mut DStream) -> Result<Self, Box<dyn StdError>> { unreachable!() }
+}
+
+impl<T: Deserialise> Deserialise for Option<T> {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn StdError>> {
+		let sign = bool::deserialise(stream)?;
+
+		if sign {
+			Ok(Some(T::deserialise(stream)?))
+		} else {
+			Ok(None)
+		}
+	}
+}
+
+impl<T: Deserialise, E: Deserialise> Deserialise for Result<T, E> {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn StdError>> {
+		let sign = bool::deserialise(stream)?;
+
+		let value = if sign {
+			Err(E::deserialise(stream)?)
+		} else {
+			Ok(T::deserialise(stream)?)
+		};
+
+		Ok(value)
+	}
+}
+
+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);
diff --git a/src/deserialise/mod.rs b/src/deserialise/mod.rs
new file mode 100644
index 0000000..17b102c
--- /dev/null
+++ b/src/deserialise/mod.rs
@@ -0,0 +1,8 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::use_mod;
+use_mod!(pub d_stream);
+use_mod!(pub deserialise);
+
+#[cfg(test)]
+mod test;
diff --git a/src/deserialise/test.rs b/src/deserialise/test.rs
new file mode 100644
index 0000000..38ad694
--- /dev/null
+++ b/src/deserialise/test.rs
@@ -0,0 +1,65 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::deserialise::{Deserialise, DStream};
+use crate::fixed_string::FixedString;
+
+#[test]
+fn test_serialise() {
+	let data = [
+		0x00, 0xFF, 0xFF, 0x0F, 0xEF, 0x1F, 0xDF, 0x2F,
+		0xCF, 0x3F, 0xBF, 0x4F, 0xAF, 0x5F, 0x9F, 0x6F,
+		0x8F, 0x7F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x09, 0x6D, 0xC3, 0xA1, 0x6E, 0x61, 0xC3,
+		0xB0, 0x75, 0x72, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x05, 0x00, 0x00, 0x03, 0xBB, 0x00,
+		0x00, 0x03, 0x91, 0x00, 0x00, 0x03, 0xBC, 0x00,
+		0x00, 0x03, 0x94, 0x00, 0x00, 0x03, 0xB1, 0x01,
+		0x00, 0x00, 0x01, 0x80,
+	];
+
+	let mut stream = DStream::from(&data);
+
+	assert_eq!(
+		u8::deserialise(&mut stream).unwrap(),
+		0x00,
+	);
+	assert_eq!(
+		u8::deserialise(&mut stream).unwrap(),
+		0xFF,
+	);
+
+	assert_eq!(
+		u128::deserialise(&mut stream).unwrap(),
+		0xFF_0F_EF_1F_DF_2F_CF_3F_BF_4F_AF_5F_9F_6F_8F_7F,
+	);
+
+	assert_eq!(
+		FixedString::<0x10>::deserialise(&mut stream).unwrap(),
+		"m\u{00E1}na\u{00F0}ur",
+	);
+
+	assert_eq!(
+		<[char; 0x5]>::deserialise(&mut stream).unwrap(),
+		['\u{03BB}', '\u{0391}', '\u{03BC}', '\u{0394}', '\u{03B1}'],
+	);
+
+	assert_eq!(
+		Option::<()>::deserialise(&mut stream).unwrap(),
+		Some(()),
+	);
+
+	assert_eq!(
+		Option::<()>::deserialise(&mut stream).unwrap(),
+		None,
+	);
+
+	assert_eq!(
+		Result::<(), i8>::deserialise(&mut stream).unwrap(),
+		Ok(()),
+	);
+
+	assert_eq!(
+		Result::<(), i8>::deserialise(&mut stream).unwrap(),
+		Err(i8::MIN),
+	);
+}
diff --git a/src/error/mod.rs b/src/error/mod.rs
new file mode 100644
index 0000000..4582394
--- /dev/null
+++ b/src/error/mod.rs
@@ -0,0 +1,95 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::checksum::Checksum;
+
+use std::error::Error as StdError;
+use std::fmt::{Display, Formatter};
+use std::process::{ExitCode, Termination};
+
+pub type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug)]
+pub enum Error {
+	ArrayLengthMismatch { len: usize, ok_len: usize },
+
+	DeserialiseFailure { source: Box<dyn StdError> },
+
+	EndOfDStream { len: usize, ok_len: usize },
+
+	InvalidBoolean { value: u8 },
+
+	InvalidCodePoint { value: u32 },
+
+	FixedStringTooShort { len: usize, s: String },
+
+	InvalidPackageLength { len: usize, ok_len: usize },
+
+	NullInteger,
+
+	PackageChecksumMismatch { sum: Checksum, ok_sum: Checksum },
+}
+
+impl Display for Error {
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+		use Error::*;
+
+		match *self {
+			ArrayLengthMismatch { len, ok_len } => {
+				write!(f, "expected array of length ({ok_len}) but got ({len}) elements")
+			},
+
+			DeserialiseFailure { ref source } => {
+				write!(f, "unable to deserialise: \"{source}\"")
+			},
+
+			EndOfDStream { len, ok_len } => {
+				write!(f, "({ok_len}) byte(s) were requested but only ({len}) byte(s) were left")
+			},
+
+			FixedStringTooShort { len, ref s } => {
+				write!(f, "fixed string with `N = {len}` cannot hold {s:?}")
+			},
+
+			InvalidBoolean { value } => {
+				write!(f, "expected boolean but got {value:#02X}")
+			},
+
+			InvalidCodePoint { value } => {
+				write!(f, "code point U+{value:04X} is not valid")
+			}
+
+			InvalidPackageLength { len, ok_len } => {
+				write!(f, "invalid packet length: expected at most ({ok_len}) byte(s) but got ({len}) byte(s)")
+			},
+
+			NullInteger => {
+				write!(f, "expected non-zero integer but got (0)")
+			},
+
+			PackageChecksumMismatch { ref sum, ref ok_sum } => {
+				write!(f, "expected packet checksum {ok_sum} but got {sum}")
+			},
+		}
+	}
+}
+
+impl StdError for Error {
+	fn source(&self) -> Option<&(dyn StdError + 'static)> {
+		use Error::*;
+
+		match *self {
+			DeserialiseFailure { ref source } => Some(source.as_ref()),
+
+			_ => None,
+		}
+	}
+}
+
+impl From<Error> for i32 {
+	fn from(_: Error) -> Self { 0x1 }
+}
+
+impl Termination for Error {
+	#[inline(always)]
+	fn report(self) -> ExitCode { ExitCode::FAILURE }
+}
diff --git a/src/fixed_string/fixed_string/mod.rs b/src/fixed_string/fixed_string/mod.rs
new file mode 100644
index 0000000..dc347f3
--- /dev/null
+++ b/src/fixed_string/fixed_string/mod.rs
@@ -0,0 +1,180 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::deserialise::{Deserialise, DStream};
+use crate::error::Error;
+use crate::fixed_string::Iter;
+use crate::serialise::{SStream, Serialise};
+
+use std::fmt::{Display, Debug, Formatter};
+use std::str::FromStr;
+
+#[derive(Clone)]
+pub struct FixedString<const N: usize> {
+	pub(in super) buf: [char; N],
+	pub(in super) len: usize,
+}
+
+impl<const N: usize> FixedString<N> {
+	pub fn new(s: &str) -> Result<Self, Error> {
+		let mut buf = ['\0'; N];
+		let     len = s.chars().count();
+
+		for (i, c) in s.chars().enumerate() {
+			if i >= N { return Err(Error::FixedStringTooShort { len: N, s: s.to_owned() }) }
+
+			buf[i] = c;
+		}
+
+		Ok(Self { buf, len })
+	}
+
+	#[inline(always)]
+	#[must_use]
+	pub const fn len(&self) -> usize { self.len }
+
+	#[inline(always)]
+	#[must_use]
+	pub const fn is_empty(&self) -> bool { self.len == 0x0 }
+
+	#[inline]
+	pub fn iter(&self) -> std::slice::Iter<'_, char> { self.buf[0x0..self.len].iter() }
+
+	#[inline]
+	pub fn iter_mut(&mut self) -> std::slice::IterMut<'_, char> { self.buf[0x0..self.len].iter_mut() }
+}
+
+impl<const N: usize> Debug for FixedString<N> {
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+		write!(f, "\"")?;
+
+		for c in self {
+			if c.is_ascii_graphic() {
+				write!(f, "{c}")?;
+			} else if *c == '\0' {
+				write!(f, "\\0")?;
+			} else {
+				write!(f, "{c}")?;
+			}
+ 		}
+
+		 write!(f, "\"")?;
+
+		Ok(())
+	}
+}
+
+impl<const N: usize> Deserialise for FixedString<N> {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn std::error::Error>> {
+		let len = usize::try_from(u64::deserialise(stream)?).unwrap();
+
+		let data = stream.take(len)?;
+		let s = std::str::from_utf8(data)?;
+
+		let len = s.chars().count();
+		if len > N {
+			return Err(Box::new(Error::FixedStringTooShort { len, s: s.to_owned() }));
+		}
+
+		let mut buf = ['\0'; N];
+		for (i, c) in s.chars().enumerate() {
+			buf[i] = c;
+		}
+
+		Ok(Self { buf, len })
+	}
+}
+
+impl<const N: usize> Default for FixedString<N> {
+	#[inline(always)]
+	fn default() -> Self { Self {
+		buf: ['\0'; N],
+		len: 0x0,
+	} }
+}
+
+impl<const N: usize> Display for FixedString<N> {
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+		for c in self { write!(f, "{c}")? }
+
+		Ok(())
+	}
+}
+
+impl<const N: usize> Eq for FixedString<N> { }
+
+impl<const N: usize> FromStr for FixedString<N> {
+	type Err = Error;
+
+	fn from_str(s: &str) -> Result<Self, Error> { Self::new(s) }
+}
+
+impl<const N: usize> IntoIterator for FixedString<N> {
+	type Item = char;
+
+	type IntoIter = Iter<N>;
+
+	fn into_iter(self) -> Self::IntoIter {
+		Iter {
+			buf: self.buf,
+			len: self.len,
+
+			pos: Some(0x0),
+		}
+	}
+}
+
+impl<'a, const N: usize> IntoIterator for &'a FixedString<N> {
+	type Item = &'a char;
+
+	type IntoIter = std::slice::Iter<'a, char>;
+
+	fn into_iter(self) -> Self::IntoIter { self.iter() }
+}
+
+impl<'a, const N: usize> IntoIterator for &'a mut FixedString<N> {
+	type Item = &'a mut char;
+
+	type IntoIter = std::slice::IterMut<'a, char>;
+
+	fn into_iter(self) -> Self::IntoIter { self.iter_mut() }
+}
+
+impl<const N: usize> PartialEq for FixedString<N> {
+	fn eq(&self, other: &Self) -> bool {
+		if self.len() != other.len() { return false };
+
+		for i in 0x0..self.len() {
+			if self.buf[i] != other.buf[i] { return false };
+		}
+
+		true
+	}
+}
+
+impl<const N: usize> PartialEq<&str> for FixedString<N> {
+	fn eq(&self, other: &&str) -> bool {
+		for (i, c) in other.chars().enumerate() {
+			if self.buf.get(i) != Some(&c) { return false };
+		}
+
+		true
+	}
+}
+
+impl<const N: usize> Serialise for FixedString<N> {
+	fn serialise(&self, stream: &mut SStream) {
+		let s: String = self.iter().collect();
+
+		let len = u64::try_from(s.len()).unwrap();
+
+		stream.append(&len.to_be_bytes());
+		stream.append(&s.into_bytes());
+	}
+}
+
+impl<const N: usize> TryFrom<&str> for FixedString<N> {
+	type Error = Error;
+
+	#[inline(always)]
+	fn try_from(value: &str) -> Result<Self, Self::Error> { Self::new(value) }
+}
diff --git a/src/fixed_string/iter/mod.rs b/src/fixed_string/iter/mod.rs
new file mode 100644
index 0000000..12de225
--- /dev/null
+++ b/src/fixed_string/iter/mod.rs
@@ -0,0 +1,23 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+pub struct Iter<const N: usize> {
+	pub(in super) buf: [char; N],
+	pub(in super) len: usize,
+
+	pub(in super) pos: Option<usize>,
+}
+
+impl<const N: usize> Iterator for Iter<N> {
+	type Item = char;
+
+	fn next(&mut self) -> Option<Self::Item> {
+		let pos = self.pos.as_mut()?;
+
+		if *pos >= self.len { return None };
+
+		let item = self.buf[*pos];
+		*pos += 0x1;
+
+		Some(item)
+	}
+}
diff --git a/src/fixed_string/mod.rs b/src/fixed_string/mod.rs
new file mode 100644
index 0000000..2ed072e
--- /dev/null
+++ b/src/fixed_string/mod.rs
@@ -0,0 +1,5 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::use_mod;
+use_mod!(pub fixed_string);
+use_mod!(pub iter);
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..1120945
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,16 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+pub mod checksum;
+pub mod deserialise;
+pub mod error;
+pub mod fixed_string;
+pub mod packet;
+pub mod serialise;
+
+macro_rules! use_mod {
+	($vis:vis $name:ident) => {
+		mod $name;
+		$vis use $name::*;
+	};
+}
+pub(in crate) use use_mod;
diff --git a/src/packet/mod.rs b/src/packet/mod.rs
new file mode 100644
index 0000000..b918dc2
--- /dev/null
+++ b/src/packet/mod.rs
@@ -0,0 +1,59 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::checksum::Checksum;
+use crate::deserialise::{Deserialise, DStream};
+use crate::error::Error;
+use crate::serialise::{SStream, Serialise};
+
+use std::mem::size_of;
+
+#[derive(Clone, Debug)]
+pub struct Packet<T: Deserialise + Serialise> {
+	message:  T,
+	checksum: Checksum,
+}
+
+impl<T: Deserialise + Serialise> Packet<T> {
+	#[must_use]
+	pub fn encode(message: T) -> Box<[u8]> {
+		let checksum = Checksum::new(&message);
+		let packet = Self { message, checksum };
+
+		SStream::from(&packet).into()
+	}
+
+	pub fn decode(data: &[u8]) -> Result<T, Error> {
+		if data.len() > size_of::<Self>() {
+			return Err(Error::InvalidPackageLength { len: data.len(), ok_len: size_of::<Self>() });
+		}
+
+		let mut data = DStream::from(data);
+
+		let packet = Self::deserialise(&mut data)
+			.map_err(|e| Error::DeserialiseFailure { source: e })?;
+
+		let checksum = Checksum::new(&packet.message);
+
+		if packet.checksum != checksum {
+			return Err(Error::PackageChecksumMismatch { sum: packet.checksum, ok_sum: checksum });
+		}
+
+		Ok(packet.message)
+	}
+}
+
+impl<T: Deserialise + Serialise> Deserialise for Packet<T> {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn std::error::Error>> {
+		Ok(Self {
+			message:  Deserialise::deserialise(stream)?,
+			checksum: Deserialise::deserialise(stream)?,
+		})
+	}
+}
+
+impl<T: Deserialise + Serialise> Serialise for Packet<T> {
+	fn serialise(&self, stream: &mut SStream) {
+		self.message.serialise(stream);
+		self.checksum.serialise(stream);
+	}
+}
diff --git a/src/serialise/mod.rs b/src/serialise/mod.rs
new file mode 100644
index 0000000..9b87751
--- /dev/null
+++ b/src/serialise/mod.rs
@@ -0,0 +1,8 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::use_mod;
+use_mod!(pub s_stream);
+use_mod!(pub serialise);
+
+#[cfg(test)]
+mod test;
diff --git a/src/serialise/s_stream/mod.rs b/src/serialise/s_stream/mod.rs
new file mode 100644
index 0000000..a1ae05c
--- /dev/null
+++ b/src/serialise/s_stream/mod.rs
@@ -0,0 +1,54 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::serialise::Serialise;
+
+use std::fmt::{Debug, Formatter};
+use std::mem::size_of;
+
+#[derive(Clone, Eq, PartialEq)]
+pub struct SStream(Vec<u8>);
+
+impl SStream {
+	#[must_use]
+	pub const fn new() -> Self { Self(Vec::new()) }
+
+	pub fn append(&mut self, extra: &[u8]) {
+		self.0.extend(extra);
+	}
+}
+
+impl AsRef<[u8]> for SStream {
+	#[inline(always)]
+	fn as_ref(&self) -> &[u8] { self.0.as_ref() }
+}
+
+impl Debug for SStream {
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+		write!(f, "[")?;
+
+		for v in &self.0 { write!(f, "{v:#02X},")? };
+
+		write!(f, "]")?;
+
+		Ok(())
+	}
+}
+
+impl Default for SStream {
+	#[inline(always)]
+	fn default() -> Self { Self::new() }
+}
+
+impl<T: Serialise> From<&T> for SStream {
+	fn from(value: &T) -> Self {
+		let mut stream = Self(Vec::with_capacity(size_of::<T>()));
+		value.serialise(&mut stream);
+
+		stream
+	}
+}
+
+impl From<SStream> for Box<[u8]> {
+	#[inline(always)]
+	fn from(value: SStream) -> Self { value.0.into_boxed_slice() }
+}
diff --git a/src/serialise/serialise/mod.rs b/src/serialise/serialise/mod.rs
new file mode 100644
index 0000000..febeee7
--- /dev/null
+++ b/src/serialise/serialise/mod.rs
@@ -0,0 +1,111 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::serialise::SStream;
+
+use std::convert::Infallible;
+use std::mem::size_of;
+use std::num::NonZero;
+
+pub trait Serialise: Sized {
+	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);
diff --git a/src/serialise/test.rs b/src/serialise/test.rs
new file mode 100644
index 0000000..5c224bc
--- /dev/null
+++ b/src/serialise/test.rs
@@ -0,0 +1,53 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::serialise::{SStream, Serialise};
+use crate::fixed_string::FixedString;
+
+#[test]
+fn test_serialise() {
+	let mut stream = SStream::new();
+
+	0x00_u8.serialise(&mut stream);
+	0xFF_u8.serialise(&mut stream);
+	0x7F_u8.serialise(&mut stream);
+
+	0x0F_7E_u16.serialise(&mut stream);
+
+	0x00_2F_87_E7_u32.serialise(&mut stream);
+
+	0xF3_37_CF_8B_DB_03_2B_39_u64.serialise(&mut stream);
+
+	0x45_A0_15_6A_36_77_17_8A_83_2E_3C_2C_84_10_58_1A_u128.serialise(&mut stream);
+
+	FixedString::<0x1>::new("A").unwrap().serialise(&mut stream);
+	FixedString::<0x8>::new("l\u{00F8}gma\u{00F0}ur").unwrap().serialise(&mut stream);
+
+	['\u{03B4}', '\u{0190}', '\u{03BB}', '\u{03A4}', '\u{03B1}'].serialise(&mut stream);
+
+	Result::<u16, char>::Ok(0x45_45).serialise(&mut stream);
+	Result::<u16, char>::Err(char::REPLACEMENT_CHARACTER).serialise(&mut stream);
+
+	Option::<()>::None.serialise(&mut stream);
+	Option::<()>::Some(()).serialise(&mut stream);
+
+	let data: Box<[u8]> = stream.into();
+
+	assert_eq!(
+		data.as_ref(),
+		[
+			0x00, 0xFF, 0x7F, 0x0F, 0x7E, 0x00, 0x2F, 0x87,
+			0xE7, 0xF3, 0x37, 0xCF, 0x8B, 0xDB, 0x03, 0x2B,
+			0x39, 0x45, 0xA0, 0x15, 0x6A, 0x36, 0x77, 0x17,
+			0x8A, 0x83, 0x2E, 0x3C, 0x2C, 0x84, 0x10, 0x58,
+			0x1A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			0x01, 0x41, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			0x00, 0x0A, 0x6C, 0xC3, 0xB8, 0x67, 0x6D, 0x61,
+			0xC3, 0xB0, 0x75, 0x72, 0x00, 0x00, 0x00, 0x00,
+			0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x03, 0xB4,
+			0x00, 0x00, 0x01, 0x90, 0x00, 0x00, 0x03, 0xBB,
+			0x00, 0x00, 0x03, 0xA4, 0x00, 0x00, 0x03, 0xB1,
+			0x00, 0x45, 0x45, 0x01, 0x00, 0x00, 0xFF, 0xFD,
+			0x00, 0x01,
+		]
+	);
+}