120 lines
3.1 KiB
Rust
120 lines
3.1 KiB
Rust
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
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// This file is part of Parity Ethereum.
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// Parity Ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity Ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity Ethereum. If not, see <http://www.gnu.org/licenses/>.
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use std::{ops, fmt, str};
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use rustc_hex::{FromHex, ToHex};
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use serde::{Serialize, Serializer, Deserialize, Deserializer};
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use serde::de::{Visitor, Error as SerdeError};
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use super::Error;
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macro_rules! impl_hash {
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($name: ident, $size: expr) => {
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pub struct $name([u8; $size]);
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impl fmt::Debug for $name {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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let self_ref: &[u8] = &self.0;
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write!(f, "{:?}", self_ref)
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}
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}
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impl PartialEq for $name {
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fn eq(&self, other: &Self) -> bool {
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let self_ref: &[u8] = &self.0;
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let other_ref: &[u8] = &other.0;
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self_ref == other_ref
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}
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}
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impl ops::Deref for $name {
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type Target = [u8];
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl Serialize for $name {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where S: Serializer {
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serializer.serialize_str(&self.0.to_hex())
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}
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}
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impl<'a> Deserialize<'a> for $name {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
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where D: Deserializer<'a> {
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struct HashVisitor;
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impl<'b> Visitor<'b> for HashVisitor {
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type Value = $name;
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fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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write!(formatter, "a hex-encoded {}", stringify!($name))
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}
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fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> where E: SerdeError {
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value.parse().map_err(SerdeError::custom)
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}
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fn visit_string<E>(self, value: String) -> Result<Self::Value, E> where E: SerdeError {
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self.visit_str(value.as_ref())
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}
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}
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deserializer.deserialize_any(HashVisitor)
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}
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}
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impl str::FromStr for $name {
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type Err = Error;
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fn from_str(value: &str) -> Result<Self, Self::Err> {
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match value.from_hex() {
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Ok(ref hex) if hex.len() == $size => {
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let mut hash = [0u8; $size];
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hash.clone_from_slice(hex);
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Ok($name(hash))
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}
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_ => Err(Error::InvalidH256),
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}
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}
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}
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impl From<&'static str> for $name {
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fn from(s: &'static str) -> Self {
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s.parse().expect(&format!("invalid string literal for {}: '{}'", stringify!($name), s))
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}
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}
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impl From<[u8; $size]> for $name {
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fn from(bytes: [u8; $size]) -> Self {
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$name(bytes)
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}
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}
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impl Into<[u8; $size]> for $name {
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fn into(self) -> [u8; $size] {
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self.0
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}
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}
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}
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}
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impl_hash!(H128, 16);
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impl_hash!(H160, 20);
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impl_hash!(H256, 32);
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