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/*
wearechat - generic multiplayer game with voip
Copyright (C) 2025 metamuffin
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, version 3 of the License only.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
use crate::packets::{Data, Object, Resource};
use anyhow::Result;
use std::{
io::{Read, Write},
marker::PhantomData,
};
pub trait ReadWrite: Sized {
fn write(&self, w: &mut dyn Write) -> Result<()>;
fn read(r: &mut dyn Read) -> Result<Self>;
fn write_alloc(&self) -> Vec<u8> {
let mut buf = Vec::new();
self.write(&mut buf).unwrap();
buf
}
}
impl ReadWrite for f32 {
fn write(&self, w: &mut dyn Write) -> Result<()> {
w.write_all(&self.to_be_bytes())?;
Ok(())
}
fn read(r: &mut dyn Read) -> Result<Self> {
let mut buf = [0; 4];
r.read_exact(&mut buf)?;
Ok(f32::from_be_bytes(buf))
}
}
impl ReadWrite for u32 {
fn write(&self, w: &mut dyn Write) -> Result<()> {
w.write_all(&self.to_be_bytes())?;
Ok(())
}
fn read(r: &mut dyn Read) -> Result<Self> {
let mut buf = [0; 4];
r.read_exact(&mut buf)?;
Ok(u32::from_be_bytes(buf))
}
}
impl ReadWrite for Vec<u8> {
fn write(&self, w: &mut dyn Write) -> Result<()> {
w.write_all(&self)?;
Ok(())
}
fn read(r: &mut dyn Read) -> Result<Self> {
let mut buf = Vec::new();
r.read_to_end(&mut buf)?;
Ok(buf)
}
}
impl ReadWrite for String {
fn write(&self, w: &mut dyn Write) -> Result<()> {
w.write_all(&(self.len() as u32).to_be_bytes())?;
w.write_all(self.as_bytes())?;
Ok(())
}
fn read(r: &mut dyn Read) -> Result<Self> {
let mut size = [0; 4];
r.read_exact(&mut size)?;
let size = u32::from_be_bytes(size);
let mut buf = vec![0; size as usize];
r.read_exact(&mut buf)?;
Ok(String::from_utf8(buf)?)
}
}
impl ReadWrite for Data {
fn write(&self, w: &mut dyn Write) -> Result<()> {
w.write_all(&(self.0.len() as u32).to_be_bytes())?;
w.write_all(&self.0)?;
Ok(())
}
fn read(r: &mut dyn Read) -> Result<Self> {
let mut size = [0; 4];
r.read_exact(&mut size)?;
let size = u32::from_be_bytes(size);
let mut buf = vec![0; size as usize];
r.read_exact(&mut buf)?;
Ok(Self(buf))
}
}
impl<T> ReadWrite for Resource<T> {
fn write(&self, w: &mut dyn Write) -> Result<()> {
w.write_all(&self.0)?;
Ok(())
}
fn read(r: &mut dyn Read) -> Result<Self> {
let mut s = Self([0; 32], PhantomData);
r.read_exact(&mut s.0)?;
Ok(s)
}
}
impl ReadWrite for Object {
fn write(&self, w: &mut dyn Write) -> Result<()> {
w.write_all(&self.0.to_be_bytes())?;
Ok(())
}
fn read(r: &mut dyn Read) -> Result<Self> {
let mut s = [0; 16];
r.read_exact(&mut s)?;
Ok(Object(u128::from_be_bytes(s)))
}
}
impl<T: ReadWrite, const N: usize> ReadWrite for [T; N] {
fn write(&self, w: &mut dyn Write) -> Result<()> {
for e in self {
e.write(w)?;
}
Ok(())
}
fn read(r: &mut dyn Read) -> Result<Self> {
[(); N].try_map(|()| T::read(r))
}
}
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