1//! Traits used in this library
2use std::io;
3
4/// Writer extension to write little endian data
5pub trait WriteBytesExt<T> {
6 /// Writes `T` to a bytes stream. Least significant byte first.
7 fn write_le(&mut self, n: T) -> io::Result<()>;
8
9 /*
10 #[inline]
11 fn write_byte(&mut self, n: u8) -> io::Result<()> where Self: Write {
12 self.write_all(&[n])
13 }
14 */
15}
16
17impl<W: io::Write + ?Sized> WriteBytesExt<u8> for W {
18 #[inline(always)]
19 fn write_le(&mut self, n: u8) -> io::Result<()> {
20 self.write_all(&[n])
21 }
22}
23
24impl<W: io::Write + ?Sized> WriteBytesExt<u16> for W {
25 #[inline]
26 fn write_le(&mut self, n: u16) -> io::Result<()> {
27 self.write_all(&[n as u8, (n >> 8) as u8])
28 }
29}
30
31impl<W: io::Write + ?Sized> WriteBytesExt<u32> for W {
32 #[inline]
33 fn write_le(&mut self, n: u32) -> io::Result<()> {
34 self.write_le(n as u16)?;
35 self.write_le((n >> 16) as u16)
36 }
37}
38
39impl<W: io::Write + ?Sized> WriteBytesExt<u64> for W {
40 #[inline]
41 fn write_le(&mut self, n: u64) -> io::Result<()> {
42 self.write_le(n as u32)?;
43 self.write_le((n >> 32) as u32)
44 }
45}
46