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|
use anyhow::Context;
use std::io::{Read, Write};
use crate::helpers::{matrix::Mat2, vector::Vec2};
pub trait Sink {
fn put<V: Ser>(&mut self, value: V) -> anyhow::Result<()>;
}
pub trait Source {
fn get<V: Ser>(&mut self) -> anyhow::Result<V>;
}
impl<T: Write> Sink for T {
fn put<V: Ser>(&mut self, value: V) -> anyhow::Result<()> {
value.write(self)
}
}
impl<T: Read> Source for T {
fn get<V: Ser>(&mut self) -> anyhow::Result<V> {
V::read(self)
}
}
pub trait Ser: Sized {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()>;
fn read(source: &mut impl Read) -> anyhow::Result<Self>;
}
impl<A: Ser, B: Ser> Ser for (A, B) {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
self.0.write(sink).context("first tuple field")?;
self.1.write(sink).context("second tuple field")?;
Ok(())
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
Ok((A::read(source)?, B::read(source)?))
}
}
impl<A: Ser, B: Ser, C: Ser> Ser for (A, B, C) {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
self.0.write(sink).context("first tuple field")?;
self.1.write(sink).context("second tuple field")?;
self.2.write(sink).context("third tuple field")?;
Ok(())
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
Ok((A::read(source)?, B::read(source)?, C::read(source)?))
}
}
impl<A: Ser, B: Ser, C: Ser, D: Ser> Ser for (A, B, C, D) {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
self.0.write(sink).context("first tuple field")?;
self.1.write(sink).context("second tuple field")?;
self.2.write(sink).context("third tuple field")?;
self.3.write(sink).context("fourth tuple field")?;
Ok(())
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
Ok((
A::read(source)?,
B::read(source)?,
C::read(source)?,
D::read(source)?,
))
}
}
impl<A: Ser, const N: usize> Ser for [A; N] {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
for e in self {
e.write(sink).context("some array")?;
}
Ok(())
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut k: [A; N] = unsafe { std::mem::zeroed() };
for i in 0..N {
k[i] = A::read(source)?;
}
Ok(k)
}
}
impl<T: Ser> Ser for Vec<T> {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
self.len().write(sink)?;
for e in self {
e.write(sink).context("some vec")?;
}
Ok(())
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut v = vec![];
for _ in 0..usize::read(source)? {
v.push(T::read(source)?)
}
Ok(v)
}
}
pub trait ConstSizeSerExt: Sized {
fn write_const_size(&self, sink: &mut impl Write, size: usize) -> anyhow::Result<()>;
fn read_const_size(source: &mut impl Read, size: usize) -> anyhow::Result<Self>;
}
impl<T: Ser> ConstSizeSerExt for Vec<T> {
fn write_const_size(&self, sink: &mut impl Write, size: usize) -> anyhow::Result<()> {
assert_eq!(self.len(), size);
for e in self {
e.write(sink).context("some const-size vec")?;
}
Ok(())
}
fn read_const_size(source: &mut impl Read, size: usize) -> anyhow::Result<Self> {
let mut v = vec![];
for _ in 0..size {
v.push(T::read(source)?)
}
Ok(v)
}
}
impl Ser for u8 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink.write_all(&[*self]).context("write u8")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 1];
source.read_exact(&mut buf)?;
Ok(buf[0])
}
}
impl Ser for i8 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 1]>(self) })
.context("write i8")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 1];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for u16 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 2]>(self) })
.context("write u16")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 2];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for u32 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 4]>(self) })
.context("write u32")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 4];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for u64 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
.context("write u64")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for usize {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
.context("write usize")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for isize {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
.context("write isize")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for f32 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 4]>(self) })
.context("write f32")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 4];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl Ser for f64 {
fn write(&self, sink: &mut impl Write) -> anyhow::Result<()> {
Ok(sink
.write_all(&unsafe { std::mem::transmute_copy::<_, [u8; 8]>(self) })
.context("write f64")?)
}
fn read(source: &mut impl Read) -> anyhow::Result<Self> {
let mut buf = [0u8; 8];
source.read_exact(&mut buf)?;
Ok(unsafe { std::mem::transmute_copy(&buf) })
}
}
impl<T: Ser + Copy> Ser for Vec2<T> {
fn write(&self, sink: &mut impl std::io::Write) -> anyhow::Result<()> {
sink.put((self.x, self.y))
}
fn read(source: &mut impl std::io::Read) -> anyhow::Result<Self> {
let (x, y) = source.get()?;
Ok(Vec2 { x, y })
}
}
impl<T: Ser + Copy> Ser for Mat2<T> {
fn write(&self, sink: &mut impl std::io::Write) -> anyhow::Result<()> {
sink.put((self.a, self.b, self.c, self.d))
}
fn read(source: &mut impl std::io::Read) -> anyhow::Result<Self> {
let (a, b, c, d) = source.get()?;
Ok(Mat2 { a, b, c, d })
}
}
pub struct Small<T>(pub T);
impl Ser for Small<Vec2<isize>> {
fn write(&self, sink: &mut impl std::io::Write) -> anyhow::Result<()> {
sink.put((self.0.x as i8, self.0.y as i8))
}
fn read(source: &mut impl std::io::Read) -> anyhow::Result<Self> {
let (x, y): (i8, i8) = source.get()?;
Ok(Small(Vec2 {
x: x as isize,
y: y as isize,
}))
}
}
pub fn map_scalar8(v: i8) -> f32 {
match v {
0 => 0.0,
x if x > 0 => 2f32.powf((x as f32).abs() / 2.0 - 2.0),
x => -2f32.powf((-x as f32).abs() / 2.0 - 2.0),
}
}
// const SCALAR8: [f32; 256] = gen_scalar8_lookup();
// const fn gen_scalar8_lookup() -> [f32; 256] {
// let mut a = [0.0; 256];
// let mut i = 0usize;
// while i < 256 {
// a[i as usize] = if i == 0 {
// 0.0
// } else {
// let x = i as i8 as f32;
// x.signum() * 2f32.powf(x.abs() / 2.0 - 2.0)
// };
// i += 1;
// }
// a
// }
#[cfg(test)]
mod test {
use super::{Ser, Sink};
use crate::format::header::Header;
use crate::{format::ser::Source, helpers::vector::Vec2};
use std::fmt::Debug;
use std::io::Cursor;
fn test_ser<T: PartialEq + Ser + Debug + Clone>(value: T) {
let mut buf = vec![];
Cursor::new(&mut buf).put(value.clone()).unwrap();
assert_eq!(value, Cursor::new(&mut buf).get().unwrap());
}
#[test]
fn simple() {
let mut buf = vec![];
Cursor::new(&mut buf).put(10usize).unwrap();
assert_eq!(10usize, Cursor::new(&mut buf).get().unwrap());
}
#[test]
fn tuple() {
let mut buf = vec![];
Cursor::new(&mut buf).put((10usize, 5u8, 3u16)).unwrap();
assert_eq!((10usize, 5u8, 3u16), Cursor::new(&mut buf).get().unwrap());
}
#[test]
fn header() {
test_ser(Header {
frame_count: 123,
resolution: Vec2 { x: 13, y: 37 },
});
}
#[test]
fn vec() {
test_ser(vec![1u16, 2, 3, 4]);
}
#[test]
fn array() {
test_ser([1u16, 2, 3, 4]);
}
}
|
