use crate::{Bytes, BytesMut, BytesVec};
use std::fmt::{Formatter, LowerHex, Result, UpperHex};
struct BytesRef<'a>(&'a [u8]);
impl<'a> LowerHex for BytesRef<'a> {
fn fmt(&self, f: &mut Formatter<'_>) -> Result {
for b in self.0 {
write!(f, "{b:02x}")?;
}
Ok(())
}
}
impl<'a> UpperHex for BytesRef<'a> {
fn fmt(&self, f: &mut Formatter<'_>) -> Result {
for b in self.0 {
write!(f, "{b:02X}")?;
}
Ok(())
}
}
macro_rules! hex_impl {
($tr:ident, $ty:ty) => {
impl $tr for $ty {
fn fmt(&self, f: &mut Formatter<'_>) -> Result {
$tr::fmt(&BytesRef(self.as_ref()), f)
}
}
};
}
hex_impl!(LowerHex, Bytes);
hex_impl!(LowerHex, BytesMut);
hex_impl!(LowerHex, BytesVec);
hex_impl!(UpperHex, Bytes);
hex_impl!(UpperHex, BytesMut);
hex_impl!(UpperHex, BytesVec);
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn hex() {
let b = Bytes::from_static(b"hello world");
let f = format!("{:x}", b);
assert_eq!(f, "68656c6c6f20776f726c64");
let f = format!("{:X}", b);
assert_eq!(f, "68656C6C6F20776F726C64");
}
}