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use std::io;
// Will be replaced by stdlib solution
fn read_all<R: io::Read + ?Sized>(this: &mut R, buf: &mut [u8]) -> io::Result<()> {
let mut total = 0;
while total < buf.len() {
match this.read(&mut buf[total..]) {
Ok(0) => return Err(io::Error::new(io::ErrorKind::Other,
"failed to read the whole buffer")),
Ok(n) => total += n,
Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {}
Err(e) => return Err(e),
}
}
Ok(())
}
/// Read extension to read big endian data
pub trait ReadBytesExt<T>: io::Read {
/// Read `T` from a bytes stream. Most significant byte first.
fn read_be(&mut self) -> io::Result<T>;
}
/// Write extension to write big endian data
pub trait WriteBytesExt<T>: io::Write {
/// Writes `T` to a bytes stream. Most significant byte first.
fn write_be(&mut self, _: T) -> io::Result<()>;
}
impl<W: io::Read + ?Sized> ReadBytesExt<u8> for W {
#[inline]
fn read_be(&mut self) -> io::Result<u8> {
let mut byte = [0];
read_all(self, &mut byte)?;
Ok(byte[0])
}
}
impl<W: io::Read + ?Sized> ReadBytesExt<u16> for W {
#[inline]
fn read_be(&mut self) -> io::Result<u16> {
let mut bytes = [0, 0];
read_all(self, &mut bytes)?;
Ok((u16::from(bytes[0])) << 8 | u16::from(bytes[1]))
}
}
impl<W: io::Read + ?Sized> ReadBytesExt<u32> for W {
#[inline]
fn read_be(&mut self) -> io::Result<u32> {
let mut bytes = [0, 0, 0, 0];
read_all(self, &mut bytes)?;
Ok( (u32::from(bytes[0])) << 24
| (u32::from(bytes[1])) << 16
| (u32::from(bytes[2])) << 8
| u32::from(bytes[3])
)
}
}
impl<W: io::Write + ?Sized> WriteBytesExt<u32> for W {
#[inline]
fn write_be(&mut self, n: u32) -> io::Result<()> {
self.write_all(&[
(n >> 24) as u8,
(n >> 16) as u8,
(n >> 8) as u8,
n as u8
])
}
}
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