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|
//! Encoding: writing protocol values into a byte stream.
use crate::codec::error::Error;
use std::{io::Write, sync::Arc};
macro_rules! impl_encode {
($t: ty) => {
impl<Ctx> Encode<Ctx> for $t {
/// write number using big endian
fn encode(&self, buffer: &mut dyn Write, _: &mut Ctx) -> Result<usize, Error> {
let size = buffer.write(&self.to_be_bytes())?;
Ok(size)
}
}
};
}
/// Write a value into a byte stream
pub trait Encode<Ctx> {
fn encode(&self, buffer: &mut dyn Write, ctx: &mut Ctx) -> Result<usize, Error>;
}
impl<Ctx> Encode<Ctx> for bool {
fn encode(&self, buffer: &mut dyn Write, _: &mut Ctx) -> Result<usize, Error> {
let size = buffer.write(&[*self as u8])?;
Ok(size)
}
}
impl<Ctx, T: Encode<Ctx>> Encode<Ctx> for Option<T> {
/// Encode `T` if Some(T) or do nothing if None
fn encode(&self, buffer: &mut dyn Write, ctx: &mut Ctx) -> Result<usize, Error> {
match self {
Some(val) => {
let size = val.encode(buffer, ctx)?;
Ok(size)
}
None => Ok(0),
}
}
}
impl<Ctx, T: Encode<Ctx>> Encode<Ctx> for Vec<T> {
/// Encode each element of vector
/// use `CountPrefix` to prefix the vector with number of elements
/// use `LenPrefix` to prefix the vector with encoded byte size
fn encode(&self, buffer: &mut dyn Write, ctx: &mut Ctx) -> Result<usize, Error> {
let mut size = 0;
for item in self {
size += item.encode(buffer, ctx)?;
}
Ok(size)
}
}
impl<Ctx> Encode<Ctx> for String {
/// Encode the string using utf8
/// use `CountPrefix` to prefix the string with char length
/// use `LenPrefix` to prefix the string with utf8 bytes length
fn encode(&self, buffer: &mut dyn Write, _: &mut Ctx) -> Result<usize, Error> {
let utf8 = self.as_bytes();
buffer.write_all(utf8)?;
Ok(utf8.len())
}
}
impl<Ctx> Encode<Ctx> for Arc<[u8]> {
/// write raw slice into the buffer
/// use `LenPrefix` to prefix with byte length
fn encode(&self, buffer: &mut dyn Write, _: &mut Ctx) -> Result<usize, Error> {
let len = buffer.write(self)?;
Ok(len)
}
}
impl<Ctx, const S: usize> Encode<Ctx> for [u8; S] {
/// write raw slice into the buffer
/// use `LenPrefix` to prefix with byte length
fn encode(&self, buffer: &mut dyn Write, _ctx: &mut Ctx) -> Result<usize, Error> {
let len = buffer.write(self)?;
Ok(len)
}
}
impl_encode!(u8);
impl_encode!(u16);
impl_encode!(u32);
impl_encode!(u64);
impl_encode!(u128);
impl_encode!(usize);
impl_encode!(i8);
impl_encode!(i16);
impl_encode!(i32);
impl_encode!(i64);
impl_encode!(i128);
impl_encode!(isize);
impl_encode!(f32);
impl_encode!(f64);
|
