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use std::str::FromStr; use crate::{H160, H256, H512, H520}; macro_rules! impl_serde { ($name:ident, $bytes_size:expr) => { impl serde::Serialize for $name { fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer, { let bytes = &self.0[..]; let mut dst = [0u8; $bytes_size * 2 + 2]; dst[0] = b'0'; dst[1] = b'x'; faster_hex::hex_encode(bytes, &mut dst[2..]) .map_err(|e| serde::ser::Error::custom(&format!("{}", e)))?; serializer.serialize_str(unsafe { ::std::str::from_utf8_unchecked(&dst) }) } } impl<'de> serde::Deserialize<'de> for $name { fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: serde::Deserializer<'de>, { struct Visitor; impl<'b> serde::de::Visitor<'b> for Visitor { type Value = $name; fn expecting( &self, formatter: &mut ::std::fmt::Formatter, ) -> ::std::fmt::Result { write!( formatter, "a 0x-prefixed hex string with {} digits", $bytes_size * 2 ) } fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> where E: serde::de::Error, { let b = v.as_bytes(); if b.len() <= 2 || &b[0..2] != b"0x" { return Err(E::custom(format_args!( "invalid format, expected {}", &self as &dyn serde::de::Expected ))); } if b.len() != $bytes_size * 2 + 2 { return Err(E::invalid_length(b.len() - 2, &self)); } $name::from_str(&v[2..]).map_err(|e| { E::custom(format_args!( "invalid hex bytes: {:?}, expected {}", e, &self as &dyn serde::de::Expected )) }) } fn visit_string<E>(self, v: String) -> Result<Self::Value, E> where E: serde::de::Error, { self.visit_str(&v) } } deserializer.deserialize_str(Visitor) } } }; } impl_serde!(H160, 20); impl_serde!(H256, 32); impl_serde!(H512, 64); impl_serde!(H520, 65);