mirror of https://github.com/dswd/zvault
113 lines
2.7 KiB
Rust
113 lines
2.7 KiB
Rust
use serde::{self, Serialize, Deserialize};
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use serde::de::Error;
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use serde::bytes::{ByteBuf, Bytes};
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use murmurhash3::murmurhash3_x64_128;
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use blake2::blake2b::blake2b;
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use std::mem;
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use std::fmt;
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use std::u64;
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#[repr(packed)]
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#[derive(Clone, Copy, PartialEq, Hash, Eq)]
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pub struct Hash {
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pub high: u64,
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pub low: u64
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}
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impl Hash {
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#[inline]
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pub fn hash(&self) -> u64 {
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self.low
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}
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#[inline]
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pub fn empty() -> Self {
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Hash{high: 0, low: 0}
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}
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}
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impl fmt::Display for Hash {
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#[inline]
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fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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write!(fmt, "{:016x}{:016x}", self.high, self.low)
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}
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}
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impl fmt::Debug for Hash {
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#[inline]
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fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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write!(fmt, "{:016x}{:016x}", self.high, self.low)
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}
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}
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impl Serialize for Hash {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
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let hash = Hash{high: u64::to_le(self.high), low: u64::to_le(self.low)};
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let dat: [u8; 16] = unsafe { mem::transmute(hash) };
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Bytes::from(&dat as &[u8]).serialize(serializer)
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}
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}
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impl Deserialize for Hash {
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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: serde::Deserializer {
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let dat: Vec<u8> = try!(ByteBuf::deserialize(deserializer)).into();
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if dat.len() != 16 {
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return Err(D::Error::custom("Invalid key length"));
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}
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let hash = unsafe { &*(dat.as_ptr() as *const Hash) };
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Ok(Hash{high: u64::from_le(hash.high), low: u64::from_le(hash.low)})
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}
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}
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#[derive(Debug, Clone, Copy)]
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pub enum HashMethod {
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Blake2,
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Murmur3
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}
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serde_impl!(HashMethod(u64) {
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Blake2 => 1,
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Murmur3 => 2
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});
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impl HashMethod {
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#[inline]
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pub fn hash(&self, data: &[u8]) -> Hash {
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match *self {
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HashMethod::Blake2 => {
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let hash = blake2b(16, &[], data);
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let hash = unsafe { &*mem::transmute::<_, *mut (u64, u64)>(hash.as_bytes().as_ptr()) };
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Hash { high: u64::from_be(hash.0), low: u64::from_be(hash.1) }
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},
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HashMethod::Murmur3 => {
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let (a, b) = murmurhash3_x64_128(data, 0);
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Hash { high: a, low: b }
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}
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}
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}
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#[inline]
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pub fn from(name: &str) -> Result<Self, &'static str> {
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match name {
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"blake2" => Ok(HashMethod::Blake2),
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"murmur3" => Ok(HashMethod::Murmur3),
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_ => Err("Unsupported hash method")
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}
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}
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#[inline]
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pub fn name(&self) -> &'static str {
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match *self {
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HashMethod::Blake2 => "blake2",
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HashMethod::Murmur3 => "murmur3"
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}
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}
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}
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