#[cfg(feature = "serde")]
pub mod serde_details {
use core::marker::PhantomData;
use core::str::FromStr;
use core::{fmt, ops, str};
use crate::FromSliceError;
struct HexVisitor<ValueT>(PhantomData<ValueT>);
use serde::{de, Deserializer, Serializer};
impl<'de, ValueT> de::Visitor<'de> for HexVisitor<ValueT>
where
ValueT: FromStr,
<ValueT as FromStr>::Err: fmt::Display,
{
type Value = ValueT;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("an ASCII hex string")
}
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: de::Error,
{
if let Ok(hex) = str::from_utf8(v) {
Self::Value::from_str(hex).map_err(E::custom)
} else {
return Err(E::invalid_value(de::Unexpected::Bytes(v), &self));
}
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
Self::Value::from_str(v).map_err(E::custom)
}
}
struct BytesVisitor<ValueT>(PhantomData<ValueT>);
impl<'de, ValueT> de::Visitor<'de> for BytesVisitor<ValueT>
where
ValueT: SerdeHash,
<ValueT as FromStr>::Err: fmt::Display,
{
type Value = ValueT;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("a bytestring")
}
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: de::Error,
{
SerdeHash::from_slice_delegated(v).map_err(|_| {
E::invalid_length(v.len(), &stringify!(N))
})
}
}
pub trait SerdeHash
where
Self: Sized
+ FromStr
+ fmt::Display
+ ops::Index<usize, Output = u8>
+ ops::Index<ops::RangeFull, Output = [u8]>,
<Self as FromStr>::Err: fmt::Display,
{
const N: usize;
fn from_slice_delegated(sl: &[u8]) -> Result<Self, FromSliceError>;
fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
if s.is_human_readable() {
s.collect_str(self)
} else {
s.serialize_bytes(&self[..])
}
}
fn deserialize<'de, D: Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
if d.is_human_readable() {
d.deserialize_str(HexVisitor::<Self>(PhantomData))
} else {
d.deserialize_bytes(BytesVisitor::<Self>(PhantomData))
}
}
}
}
#[macro_export]
#[cfg(feature = "serde")]
macro_rules! serde_impl(
($t:ident, $len:expr $(, $gen:ident: $gent:ident)*) => (
impl<$($gen: $gent),*> $crate::serde_macros::serde_details::SerdeHash for $t<$($gen),*> {
const N : usize = $len;
fn from_slice_delegated(sl: &[u8]) -> Result<Self, $crate::FromSliceError> {
#[allow(unused_imports)]
use $crate::Hash as _;
$t::from_slice(sl)
}
}
impl<$($gen: $gent),*> $crate::serde::Serialize for $t<$($gen),*> {
fn serialize<S: $crate::serde::Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
$crate::serde_macros::serde_details::SerdeHash::serialize(self, s)
}
}
impl<'de $(, $gen: $gent)*> $crate::serde::Deserialize<'de> for $t<$($gen),*> {
fn deserialize<D: $crate::serde::Deserializer<'de>>(d: D) -> Result<$t<$($gen),*>, D::Error> {
$crate::serde_macros::serde_details::SerdeHash::deserialize(d)
}
}
));
#[macro_export]
#[cfg(not(feature = "serde"))]
macro_rules! serde_impl(
($t:ident, $len:expr $(, $gen:ident: $gent:ident)*) => ()
);