Merge pull request #16 from paritytech/chore/plain_hasher-no_std
[plain_hasher] Remove dep on ethereum-types and make no_std compatible
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4733c5da04
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@ -1,13 +1,16 @@
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[package]
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name = "plain_hasher"
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description = "Hasher for 32-bit keys."
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version = "0.1.0"
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version = "0.2.0"
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authors = ["Parity Technologies <admin@parity.io>"]
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license = "MIT"
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keywords = ["hash", "hasher"]
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homepage = "https://github.com/paritytech/plain_hasher"
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homepage = "https://github.com/paritytech/parity-common"
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categories = [ "no-std"]
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[dependencies]
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crunchy = "0.1.6"
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ethereum-types = "0.3"
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hashdb = { path = "../hashdb" }
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[features]
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default = ["std"]
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std = []
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@ -0,0 +1,5 @@
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# Specialized Hasher for 32-bit keys
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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.
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The crate is `no_std`-compatible.
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@ -14,20 +14,15 @@
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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#![cfg_attr(not(feature = "std"), no_std)]
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#[macro_use]
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extern crate crunchy;
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extern crate ethereum_types;
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extern crate hashdb;
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use ethereum_types::H256;
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// use hashdb::Hasher;
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use std::hash;
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use std::collections::{HashMap, HashSet};
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/// Specialized version of `HashMap` with H256 keys and fast hashing function.
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pub type H256FastMap<T> = HashMap<H256, T, hash::BuildHasherDefault<PlainHasher>>;
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/// Specialized version of `HashSet` with H256 keys and fast hashing function.
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pub type H256FastSet = HashSet<H256, hash::BuildHasherDefault<PlainHasher>>;
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#[cfg(feature = "std")]
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extern crate core;
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use core::hash;
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/// Hasher that just takes 8 bytes of the provided value.
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/// May only be used for keys which are 32 bytes.
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#[derive(Default)]
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@ -50,7 +45,7 @@ impl hash::Hasher for PlainHasher {
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unroll! {
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for _i in 0..8 {
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unsafe {
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unsafe {
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*prefix_ptr ^= (*bytes_ptr ^ *bytes_ptr.offset(8)) ^ (*bytes_ptr.offset(16) ^ *bytes_ptr.offset(24));
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bytes_ptr = bytes_ptr.offset(1);
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prefix_ptr = prefix_ptr.offset(1);
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@ -10,4 +10,4 @@ license = "GPL-3.0"
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ethereum-types = "0.3"
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tiny-keccak = "1.4.2"
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hashdb = { version = "0.2.0", path = "../../hashdb" }
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plain_hasher = { version = "0.1.0", path = "../../plain_hasher" }
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plain_hasher = { path = "../../plain_hasher" }
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