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use std::convert::TryFrom;
pub trait Serializer {
fn write(&mut self, bytes: &[u8]);
}
pub enum DeserializeError {
InsufficientData,
InvalidData,
}
pub trait Deserializer<'de> {
fn read(&mut self, len: usize) -> Result<&'de [u8], DeserializeError>;
}
pub trait Serialize<'de>: Sized {
fn serialize<S>(&self, serializer: &mut S)
where
S: Serializer;
fn deserialize<D>(deserializer: &mut D) -> Result<Self, DeserializeError>
where
D: Deserializer<'de>;
}
macro_rules! impl_serialize_num {
($type:ty) => {
impl<'de> Serialize<'de> for $type {
fn serialize<S>(&self, serializer: &mut S)
where
S: Serializer,
{
serializer.write(&self.to_le_bytes());
}
fn deserialize<D>(deserializer: &mut D) -> Result<Self, DeserializeError>
where
D: Deserializer<'de>,
{
let mut buf = [0; std::mem::size_of::<$type>()];
let bytes = deserializer.read(buf.len())?;
buf.clone_from_slice(bytes);
Ok(<$type>::from_le_bytes(buf))
}
}
};
}
impl_serialize_num!(u8);
impl_serialize_num!(u16);
impl_serialize_num!(u32);
impl<'de> Serialize<'de> for char {
fn serialize<S>(&self, serializer: &mut S)
where
S: Serializer,
{
let value = *self as u32;
value.serialize(serializer);
}
fn deserialize<D>(deserializer: &mut D) -> Result<Self, DeserializeError>
where
D: Deserializer<'de>,
{
let value = u32::deserialize(deserializer)?;
char::try_from(value).map_err(|_| DeserializeError::InvalidData)
}
}
impl<'de> Serialize<'de> for &'de [u8] {
fn serialize<S>(&self, serializer: &mut S)
where
S: Serializer,
{
let len = self.len() as u32;
len.serialize(serializer);
serializer.write(self);
}
fn deserialize<D>(deserializer: &mut D) -> Result<Self, DeserializeError>
where
D: Deserializer<'de>,
{
let len = u32::deserialize(deserializer)?;
deserializer.read(len as _)
}
}
impl<'de> Serialize<'de> for &'de str {
fn serialize<S>(&self, serializer: &mut S)
where
S: Serializer,
{
self.as_bytes().serialize(serializer)
}
fn deserialize<D>(deserializer: &mut D) -> Result<Self, DeserializeError>
where
D: Deserializer<'de>,
{
let bytes = <&[u8]>::deserialize(deserializer)?;
std::str::from_utf8(bytes).map_err(|_| DeserializeError::InvalidData)
}
}
impl Serializer for Vec<u8> {
fn write(&mut self, buf: &[u8]) {
self.extend_from_slice(buf);
}
}
impl<'de> Deserializer<'de> for &'de [u8] {
fn read(&mut self, len: usize) -> Result<&'de [u8], DeserializeError> {
if len <= self.len() {
let (read, rest) = self.split_at(len);
*self = rest;
Ok(read)
} else {
Err(DeserializeError::InsufficientData)
}
}
}