openharmony/third_party_rust_rustc-hash
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Merge pull request #9 from nickray/nickray-remove-byteorder

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Remove byteorder dependency
This commit is contained in:
Mark Rousskov 2020-02-08 08:04:23 -05:00 committed by GitHub
commit 22ad53ec9f
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2 changed files with 5 additions and 11 deletions
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3
Cargo.toml
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@ -7,6 +7,3 @@ license = "Apache-2.0/MIT"
readme = "README.md"
keywords = ["hash", "fxhash", "rustc"]
repository = "https://github.com/rust-lang-nursery/rustc-hash"
[dependencies]
byteorder = "1.1"

13
src/lib.rs
View File

@ -18,16 +18,13 @@
//! map.insert(22, 44);
//! ```
extern crate byteorder;
use std::collections::{HashMap, HashSet};
use std::convert::TryInto;
use std::default::Default;
use std::hash::{Hasher, BuildHasherDefault};
use std::ops::BitXor;
use std::mem::size_of;
use byteorder::{ByteOrder, NativeEndian};
/// Type alias for a hashmap using the `fx` hash algorithm.
pub type FxHashMap<K, V> = HashMap<K, V, BuildHasherDefault<FxHasher>>;
@ -72,9 +69,9 @@ impl Hasher for FxHasher {
#[inline]
fn write(&mut self, mut bytes: &[u8]) {
#[cfg(target_pointer_width = "32")]
let read_usize = |bytes| NativeEndian::read_u32(bytes);
let read_usize = |bytes: &[u8]| u32::from_ne_bytes(bytes[..4].try_into().unwrap());
#[cfg(target_pointer_width = "64")]
let read_usize = |bytes| NativeEndian::read_u64(bytes);
let read_usize = |bytes: &[u8]| u64::from_ne_bytes(bytes[..8].try_into().unwrap());
let mut hash = FxHasher { hash: self.hash };
assert!(size_of::<usize>() <= 8);
@ -83,11 +80,11 @@ impl Hasher for FxHasher {
bytes = &bytes[size_of::<usize>()..];
}
if (size_of::<usize>() > 4) && (bytes.len() >= 4) {
hash.add_to_hash(NativeEndian::read_u32(bytes) as usize);
hash.add_to_hash(u32::from_ne_bytes(bytes[..4].try_into().unwrap()) as usize);
bytes = &bytes[4..];
}
if (size_of::<usize>() > 2) && bytes.len() >= 2 {
hash.add_to_hash(NativeEndian::read_u16(bytes) as usize);
hash.add_to_hash(u16::from_ne_bytes(bytes[..2].try_into().unwrap()) as usize);
bytes = &bytes[2..];
}
if (size_of::<usize>() > 1) && bytes.len() >= 1 {