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use std::io::{self, Read, Write};
use byteorder::{LittleEndian, WriteBytesExt, ReadBytesExt};
use std::borrow::Cow;
use cgmath::{Point2, Point3, Vector3, Matrix4};
pub trait Encode: Sized {
fn read<R>(r: &mut R) -> io::Result<Self> where R: Read;
fn write<W>(&self, w: &mut W) -> io::Result<()> where W: Write;
}
impl Encode for String {
fn read<T: Read>(data: &mut T) -> io::Result<Self> {
Cow::read(data).map(Cow::into_owned)
}
fn write<W: Write>(&self, w: &mut W) -> io::Result<()> where W: Write {
write_str(w, &self)
}
}
impl<'a> Encode for Cow<'a, str> {
fn read<T: Read>(data: &mut T) -> io::Result<Self> {
let len = data.read_u32::<LittleEndian>()? as usize;
let mut string = String::with_capacity(len);
let mut end = false;
for _ in 0..len {
let byte = data.read_u8()?;
if byte==0 {
end = true;
}
if !end {
string.push(byte as char);
}
}
Ok(Cow::Owned(string))
}
fn write<W: Write>(&self, w: &mut W) -> io::Result<()> where W: Write {
write_str(w, &self)
}
}
fn write_str<W: Write>(w: &mut W, s: &str) -> io::Result<()> where W: Write {
let s = s.trim_right_matches('\0');
let len = s.chars().count() + 1;
if len > u32::max_value() as usize {
return Err(io::Error::new(io::ErrorKind::InvalidData, "Cannot write a string more than 4GB long"));
}
w.write_u32::<LittleEndian>(len as u32)?;
for char in s.chars() {
w.write_u8(if char < '\u{256}' { char as u8 } else { '?' as u8 })?;
}
w.write_u8(0)
}
impl Encode for Point2<f32> {
fn read<R>(data: &mut R) -> io::Result<Self> where R: Read {
Ok(Point2 {
x: data.read_f32::<LittleEndian>()?,
y: data.read_f32::<LittleEndian>()?
})
}
fn write<W>(&self, w: &mut W) -> io::Result<()> where W: Write {
w.write_f32::<LittleEndian>(self.x)?;
w.write_f32::<LittleEndian>(self.y)
}
}
impl Encode for Point3<f32> {
fn read<R>(data: &mut R) -> io::Result<Self> where R: Read {
Ok(Point3 {
x: data.read_f32::<LittleEndian>()?,
y: data.read_f32::<LittleEndian>()?,
z: data.read_f32::<LittleEndian>()?
})
}
fn write<W>(&self, w: &mut W) -> io::Result<()> where W: Write {
w.write_f32::<LittleEndian>(self.x)?;
w.write_f32::<LittleEndian>(self.y)?;
w.write_f32::<LittleEndian>(self.z)
}
}
impl Encode for Vector3<f32> {
fn read<R>(data: &mut R) -> io::Result<Self> where R: Read {
Ok(Vector3 {
x: data.read_f32::<LittleEndian>()?,
y: data.read_f32::<LittleEndian>()?,
z: data.read_f32::<LittleEndian>()?
})
}
fn write<W>(&self, w: &mut W) -> io::Result<()> where W: Write {
w.write_f32::<LittleEndian>(self.x)?;
w.write_f32::<LittleEndian>(self.y)?;
w.write_f32::<LittleEndian>(self.z)
}
}
impl Encode for Matrix4<f32> {
fn read<R>(data: &mut R) -> io::Result<Self> where R: Read {
let rows = [
[ data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()? ],
[ data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()? ],
[ data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()? ],
[ data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()?, data.read_f32::<LittleEndian>()? ]
];
Ok(Matrix4::new (
rows[0][0], rows[1][0], rows[2][0], rows[3][0],
rows[0][1], rows[1][1], rows[2][1], rows[3][1],
rows[0][2], rows[1][2], rows[2][2], rows[3][2],
rows[0][3], rows[1][3], rows[2][3], rows[3][3]
))
}
fn write<W>(&self, w: &mut W) -> io::Result<()> where W: Write {
w.write_f32::<LittleEndian>(self.x.x)?;
w.write_f32::<LittleEndian>(self.y.x)?;
w.write_f32::<LittleEndian>(self.z.x)?;
w.write_f32::<LittleEndian>(self.w.x)?;
w.write_f32::<LittleEndian>(self.x.y)?;
w.write_f32::<LittleEndian>(self.y.y)?;
w.write_f32::<LittleEndian>(self.z.y)?;
w.write_f32::<LittleEndian>(self.w.y)?;
w.write_f32::<LittleEndian>(self.x.z)?;
w.write_f32::<LittleEndian>(self.y.z)?;
w.write_f32::<LittleEndian>(self.z.z)?;
w.write_f32::<LittleEndian>(self.w.z)?;
w.write_f32::<LittleEndian>(self.x.w)?;
w.write_f32::<LittleEndian>(self.y.w)?;
w.write_f32::<LittleEndian>(self.z.w)?;
w.write_f32::<LittleEndian>(self.w.w)
}
}