blake2b 0.5.2

use std::cmp::{Eq, PartialEq,};
use std::convert::{AsRef, AsMut};
use std::fmt::{self, Formatter, Debug};
use std::ops::{Deref, DerefMut};

use slice_ext::{SliceExt};

#[derive(Clone)]
pub struct Hash {
	hash: [u64; 8],
	len: usize
}

impl Hash {
	pub fn new(hash: [u64; 8], len: usize) -> Self {
		assert!(len <= 64);

		Hash { hash: hash, len: len }
	}

	pub fn len(&self) -> usize {
		self.len as usize
	}

	pub fn into_u64_array(self) -> [u64; 8] {
		assert!(self.len == 64);

		self.hash
	}
}

impl AsRef<[u8]> for Hash {
	fn as_ref(&self) -> &[u8] {
		&self.hash.as_bytes()[..self.len]
	}
}

impl AsRef<[u64]> for Hash {
	fn as_ref(&self) -> &[u64] {
		assert!(self.len % 8 == 0);
		&self.hash[..self.len / 8]
	}
}

impl AsMut<[u8]> for Hash {
	fn as_mut<'a>(&'a mut self) -> &'a mut [u8] {
		&mut self.hash.as_mut_bytes()[..self.len]
	}
}

impl AsMut<[u64]> for Hash {
	fn as_mut<'a>(&'a mut self) -> &'a mut [u64] {
		assert!(self.len % 8 == 0);
		&mut self.hash[..self.len / 8]
	}
}

impl Debug for Hash {
	fn fmt(&self, fmt: &mut Formatter) -> fmt::Result {
		fmt::Debug::fmt(&**self, fmt)
	}
}

impl Deref for Hash {
	type Target = [u8];

	fn deref<'a>(&'a self) -> &'a Self::Target {
		self.as_ref()
	}
}

impl DerefMut for Hash {
	fn deref_mut<'a>(&'a mut self) -> &'a mut Self::Target {
		self.as_mut()
	}
}

impl Eq for Hash {}

impl PartialEq for Hash {
	fn eq(&self, rhs: &Self) -> bool {
		&**self == &**rhs
	}
}

impl PartialEq<[u8]> for Hash {
	fn eq(&self, rhs: &[u8]) -> bool {
		&**self == rhs
	}
}