mirror of
https://github.com/zaphar/merkle-dag.git
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57 lines
1.7 KiB
Rust
57 lines
1.7 KiB
Rust
// Copyright 2022 Jeremy Wall (Jeremy@marzhilsltudios.com)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use std::hash::Hasher;
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/// Utility Trait to specify that payloads must be serializable into bytes.
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pub trait ByteEncoder {
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fn bytes(&self) -> Vec<u8>;
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}
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/// Utility Trait to specify the hashing algorithm and provide a common
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/// interface for that algorithm to provide. This interface is expected to
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/// be stateful.
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pub trait HashWriter<const LEN: usize>: Default {
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/// Record bytes from an iterator into our hash algorithm.
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fn record<I: Iterator<Item = u8>>(&mut self, bs: I);
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/// Provide the current hash value based on the bytes that have so far been recorded.
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/// It is expected that you can call this method multiple times while recording the
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/// the bytes for input into the hash.
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fn hash(&self) -> [u8; LEN];
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}
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impl<H> HashWriter<8> for H
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where
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H: Hasher + Default,
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{
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fn record<I: Iterator<Item = u8>>(&mut self, iter: I) {
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let bytes = iter.collect::<Vec<u8>>();
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self.write(bytes.as_slice());
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}
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fn hash(&self) -> [u8; 8] {
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self.finish().to_le_bytes()
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}
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}
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impl<S> ByteEncoder for S
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where
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S: ToString,
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{
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fn bytes(&self) -> Vec<u8> {
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self.to_string().into_bytes()
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}
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}
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