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parity-common
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Merge branch 'master' into refactor/rlp-optionally-independent-of-ethereum-types 

* master:
  Add a README, categorize as "no-std", version bump: 0.2
  Remove dep on ethereum-types and make no_std compatible
This commit is contained in:
David Palm 2018-08-09 11:27:26 +02:00
parent 4ad57999be 4733c5da04
commit 883dd06468
4 changed files with 19 additions and 16 deletions
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11
plain_hasher/Cargo.toml
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@ -1,13 +1,16 @@
[package]
name = "plain_hasher"
description = "Hasher for 32-bit keys."
version = "0.1.0"
version = "0.2.0"
authors = ["Parity Technologies <admin@parity.io>"]
license = "MIT"
keywords = ["hash", "hasher"]
homepage = "https://github.com/paritytech/plain_hasher"
homepage = "https://github.com/paritytech/parity-common"
categories = [ "no-std"]
[dependencies]
crunchy = "0.1.6"
ethereum-types = "0.3"
hashdb = { path = "../hashdb" }
[features]
default = ["std"]
std = []

5
plain_hasher/README.md Normal file
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@ -0,0 +1,5 @@
# Specialized Hasher for 32-bit keys
Provides `PlainHasher`, a specialized `core::hash::Hasher` that takes just 8 bytes of the provided value and may only be used for keys which are 32 bytes.
The crate is `no_std`-compatible.

17
plain_hasher/src/lib.rs
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@ -14,20 +14,15 @@
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
#![cfg_attr(not(feature = "std"), no_std)]
#[macro_use]
extern crate crunchy;
extern crate ethereum_types;
extern crate hashdb;
use ethereum_types::H256;
// use hashdb::Hasher;
use std::hash;
use std::collections::{HashMap, HashSet};
/// Specialized version of `HashMap` with H256 keys and fast hashing function.
pub type H256FastMap<T> = HashMap<H256, T, hash::BuildHasherDefault<PlainHasher>>;
/// Specialized version of `HashSet` with H256 keys and fast hashing function.
pub type H256FastSet = HashSet<H256, hash::BuildHasherDefault<PlainHasher>>;
#[cfg(feature = "std")]
extern crate core;
use core::hash;
/// Hasher that just takes 8 bytes of the provided value.
/// May only be used for keys which are 32 bytes.
#[derive(Default)]
@ -50,7 +45,7 @@ impl hash::Hasher for PlainHasher {
unroll! {
for _i in 0..8 {
unsafe {
unsafe {
*prefix_ptr ^= (*bytes_ptr ^ *bytes_ptr.offset(8)) ^ (*bytes_ptr.offset(16) ^ *bytes_ptr.offset(24));
bytes_ptr = bytes_ptr.offset(1);
prefix_ptr = prefix_ptr.offset(1);

2
test-support/keccak-hasher/Cargo.toml
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@ -10,4 +10,4 @@ license = "GPL-3.0"
ethereum-types = "0.3"
tiny-keccak = "1.4.2"
hashdb = { version = "0.2.0", path = "../../hashdb" }
plain_hasher = { version = "0.1.0", path = "../../plain_hasher" }
plain_hasher = { path = "../../plain_hasher" }