| use std::io; |
| |
| /// Configuration parameter trait |
| pub trait Parameter<Object> { |
| fn set_param(self, &mut Object); |
| } |
| |
| /// Object has parameters |
| pub trait HasParameters: Sized { |
| fn set<T: Parameter<Self>>(&mut self, value: T) -> &mut Self { |
| value.set_param(self); |
| self |
| } |
| } |
| |
| |
| // 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]; |
| try!(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]; |
| try!(read_all(self, &mut bytes)); |
| Ok((bytes[0] as u16) << 8 | bytes[1] as u16) |
| } |
| } |
| |
| 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]; |
| try!(read_all(self, &mut bytes)); |
| Ok( (bytes[0] as u32) << 24 |
| | (bytes[1] as u32) << 16 |
| | (bytes[2] as u32) << 8 |
| | bytes[3] as u32 |
| ) |
| } |
| } |
| |
| 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 |
| ]) |
| } |
| } |