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use core::convert::TryInto;
pub trait ByteOrder {
fn read_u16(buf: &[u8]) -> u16;
fn read_u32(buf: &[u8]) -> u32;
fn read_u64(buf: &[u8]) -> u64;
fn read_uint(buf: &[u8], nbytes: usize) -> u64;
fn write_u16(buf: &mut [u8], n: u16);
fn write_u32(buf: &mut [u8], n: u32);
fn write_u64(buf: &mut [u8], n: u64);
fn write_uint(buf: &mut [u8], n: u64, nbytes: usize);
}
pub enum BigEndian {}
pub enum LittleEndian {}
pub enum NativeEndian {}
macro_rules! impl_endian {
($t:ty, $from_endian:ident, $to_endian:ident) => {
impl ByteOrder for $t {
#[inline]
fn read_u16(buf: &[u8]) -> u16 {
u16::$from_endian(buf[0..2].try_into().unwrap())
}
#[inline]
fn read_u32(buf: &[u8]) -> u32 {
u32::$from_endian(buf[0..4].try_into().unwrap())
}
#[inline]
fn read_u64(buf: &[u8]) -> u64 {
u64::$from_endian(buf[0..8].try_into().unwrap())
}
#[inline]
fn read_uint(buf: &[u8], nbytes: usize) -> u64 {
let mut dst = [0u8; 8];
dst[..nbytes].copy_from_slice(&buf[..nbytes]);
u64::$from_endian(dst)
}
#[inline]
fn write_u16(buf: &mut [u8], n: u16) {
buf[0..2].copy_from_slice(&n.$to_endian()[..]);
}
#[inline]
fn write_u32(buf: &mut [u8], n: u32) {
buf[0..4].copy_from_slice(&n.$to_endian()[..]);
}
#[inline]
fn write_u64(buf: &mut [u8], n: u64) {
buf[0..8].copy_from_slice(&n.$to_endian()[..]);
}
#[inline]
fn write_uint(buf: &mut [u8], n: u64, nbytes: usize) {
buf[..nbytes].copy_from_slice(&n.$to_endian()[..nbytes]);
}
}
};
}
impl_endian! {
BigEndian, from_be_bytes, to_be_bytes
}
impl_endian! {
LittleEndian, from_le_bytes, to_le_bytes
}
impl_endian! {
NativeEndian, from_ne_bytes, to_ne_bytes
}
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