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use crate::cid::Cid;
use crate::error::BlockError;
use core::hash::{BuildHasher, Hasher};
use multihash::Multihash;
use std::collections::{HashMap, HashSet};
pub trait Hash {
const CODE: multihash::Code;
fn digest(bytes: &[u8]) -> Multihash;
}
macro_rules! hash {
($name:ident) => {
#[derive(Clone, Debug, Hash, PartialEq, Eq)]
pub struct $name;
#[allow(clippy::derive_hash_xor_eq)]
impl Hash for $name {
const CODE: multihash::Code = multihash::Code::$name;
fn digest(bytes: &[u8]) -> Multihash {
multihash::$name::digest(bytes)
}
}
};
}
hash!(Identity);
hash!(Sha1);
hash!(Sha2_256);
hash!(Sha2_512);
hash!(Sha3_224);
hash!(Sha3_256);
hash!(Sha3_384);
hash!(Sha3_512);
hash!(Keccak224);
hash!(Keccak256);
hash!(Keccak384);
hash!(Keccak512);
hash!(Blake2b256);
hash!(Blake2b512);
hash!(Blake2s128);
hash!(Blake2s256);
pub fn digest(code: multihash::Code, bytes: &[u8]) -> Result<Multihash, BlockError> {
Ok(match code {
multihash::Code::Identity => multihash::Identity::digest(bytes),
multihash::Code::Sha1 => multihash::Sha1::digest(bytes),
multihash::Code::Sha2_256 => multihash::Sha2_256::digest(bytes),
multihash::Code::Sha2_512 => multihash::Sha2_512::digest(bytes),
multihash::Code::Sha3_224 => multihash::Sha3_224::digest(bytes),
multihash::Code::Sha3_256 => multihash::Sha3_256::digest(bytes),
multihash::Code::Sha3_384 => multihash::Sha3_384::digest(bytes),
multihash::Code::Sha3_512 => multihash::Sha3_512::digest(bytes),
multihash::Code::Keccak224 => multihash::Keccak224::digest(bytes),
multihash::Code::Keccak256 => multihash::Keccak256::digest(bytes),
multihash::Code::Keccak384 => multihash::Keccak384::digest(bytes),
multihash::Code::Keccak512 => multihash::Keccak512::digest(bytes),
multihash::Code::Blake2b256 => multihash::Blake2b256::digest(bytes),
multihash::Code::Blake2b512 => multihash::Blake2b512::digest(bytes),
multihash::Code::Blake2s128 => multihash::Blake2s128::digest(bytes),
multihash::Code::Blake2s256 => multihash::Blake2s256::digest(bytes),
code => return Err(BlockError::UnsupportedMultihash(code)),
})
}
#[derive(Clone, Default)]
pub struct BuildCidHasher;
impl BuildHasher for BuildCidHasher {
type Hasher = CidHasher;
fn build_hasher(&self) -> Self::Hasher {
CidHasher(None)
}
}
pub struct CidHasher(Option<u64>);
impl Hasher for CidHasher {
fn finish(&self) -> u64 {
self.0.unwrap()
}
fn write(&mut self, bytes: &[u8]) {
let mut b = [0u8; 8];
b.clone_from_slice(&bytes[..8]);
self.0 = Some(u64::from_be_bytes(b));
}
fn write_u64(&mut self, i: u64) {
self.0 = Some(i);
}
}
pub type CidHashMap<V> = HashMap<Cid, V, BuildCidHasher>;
pub type CidHashSet = HashSet<Cid, BuildCidHasher>;