#![allow(deprecated)] 
use crate::cmp;
use crate::marker::PhantomData;
use crate::mem;
use crate::ptr;
#[unstable(feature = "hashmap_internals", issue = "none")]
#[rustc_deprecated(
    since = "1.13.0",
    reason = "use `std::collections::hash_map::DefaultHasher` instead"
)]
#[derive(Debug, Clone, Default)]
#[doc(hidden)]
pub struct SipHasher13 {
    hasher: Hasher<Sip13Rounds>,
}
#[unstable(feature = "hashmap_internals", issue = "none")]
#[rustc_deprecated(
    since = "1.13.0",
    reason = "use `std::collections::hash_map::DefaultHasher` instead"
)]
#[derive(Debug, Clone, Default)]
struct SipHasher24 {
    hasher: Hasher<Sip24Rounds>,
}
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_deprecated(
    since = "1.13.0",
    reason = "use `std::collections::hash_map::DefaultHasher` instead"
)]
#[derive(Debug, Clone, Default)]
pub struct SipHasher(SipHasher24);
#[derive(Debug)]
struct Hasher<S: Sip> {
    k0: u64,
    k1: u64,
    length: usize, 
    state: State,  
    tail: u64,     
    ntail: usize,  
    _marker: PhantomData<S>,
}
#[derive(Debug, Clone, Copy)]
#[repr(C)]
struct State {
    
    
    
    
    v0: u64,
    v2: u64,
    v1: u64,
    v3: u64,
}
macro_rules! compress {
    ($state:expr) => {{ compress!($state.v0, $state.v1, $state.v2, $state.v3) }};
    ($v0:expr, $v1:expr, $v2:expr, $v3:expr) => {{
        $v0 = $v0.wrapping_add($v1);
        $v1 = $v1.rotate_left(13);
        $v1 ^= $v0;
        $v0 = $v0.rotate_left(32);
        $v2 = $v2.wrapping_add($v3);
        $v3 = $v3.rotate_left(16);
        $v3 ^= $v2;
        $v0 = $v0.wrapping_add($v3);
        $v3 = $v3.rotate_left(21);
        $v3 ^= $v0;
        $v2 = $v2.wrapping_add($v1);
        $v1 = $v1.rotate_left(17);
        $v1 ^= $v2;
        $v2 = $v2.rotate_left(32);
    }};
}
macro_rules! load_int_le {
    ($buf:expr, $i:expr, $int_ty:ident) => {{
        debug_assert!($i + mem::size_of::<$int_ty>() <= $buf.len());
        let mut data = 0 as $int_ty;
        ptr::copy_nonoverlapping(
            $buf.get_unchecked($i),
            &mut data as *mut _ as *mut u8,
            mem::size_of::<$int_ty>(),
        );
        data.to_le()
    }};
}
#[inline]
unsafe fn u8to64_le(buf: &[u8], start: usize, len: usize) -> u64 {
    debug_assert!(len < 8);
    let mut i = 0; 
    let mut out = 0;
    if i + 3 < len {
        out = load_int_le!(buf, start + i, u32) as u64;
        i += 4;
    }
    if i + 1 < len {
        out |= (load_int_le!(buf, start + i, u16) as u64) << (i * 8);
        i += 2
    }
    if i < len {
        out |= (*buf.get_unchecked(start + i) as u64) << (i * 8);
        i += 1;
    }
    debug_assert_eq!(i, len);
    out
}
impl SipHasher {
    
    #[inline]
    #[stable(feature = "rust1", since = "1.0.0")]
    #[rustc_deprecated(
        since = "1.13.0",
        reason = "use `std::collections::hash_map::DefaultHasher` instead"
    )]
    pub fn new() -> SipHasher {
        SipHasher::new_with_keys(0, 0)
    }
    
    #[inline]
    #[stable(feature = "rust1", since = "1.0.0")]
    #[rustc_deprecated(
        since = "1.13.0",
        reason = "use `std::collections::hash_map::DefaultHasher` instead"
    )]
    pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher {
        SipHasher(SipHasher24 { hasher: Hasher::new_with_keys(key0, key1) })
    }
}
impl SipHasher13 {
    
    #[inline]
    #[unstable(feature = "hashmap_internals", issue = "none")]
    #[rustc_deprecated(
        since = "1.13.0",
        reason = "use `std::collections::hash_map::DefaultHasher` instead"
    )]
    pub fn new() -> SipHasher13 {
        SipHasher13::new_with_keys(0, 0)
    }
    
    #[inline]
    #[unstable(feature = "hashmap_internals", issue = "none")]
    #[rustc_deprecated(
        since = "1.13.0",
        reason = "use `std::collections::hash_map::DefaultHasher` instead"
    )]
    pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher13 {
        SipHasher13 { hasher: Hasher::new_with_keys(key0, key1) }
    }
}
impl<S: Sip> Hasher<S> {
    #[inline]
    fn new_with_keys(key0: u64, key1: u64) -> Hasher<S> {
        let mut state = Hasher {
            k0: key0,
            k1: key1,
            length: 0,
            state: State { v0: 0, v1: 0, v2: 0, v3: 0 },
            tail: 0,
            ntail: 0,
            _marker: PhantomData,
        };
        state.reset();
        state
    }
    #[inline]
    fn reset(&mut self) {
        self.length = 0;
        self.state.v0 = self.k0 ^ 0x736f6d6570736575;
        self.state.v1 = self.k1 ^ 0x646f72616e646f6d;
        self.state.v2 = self.k0 ^ 0x6c7967656e657261;
        self.state.v3 = self.k1 ^ 0x7465646279746573;
        self.ntail = 0;
    }
    
    
    
    
    
    #[inline]
    fn short_write(&mut self, msg: &[u8]) {
        debug_assert!(msg.len() <= 8);
        let length = msg.len();
        self.length += length;
        let needed = 8 - self.ntail;
        let fill = cmp::min(length, needed);
        if fill == 8 {
            self.tail = unsafe { load_int_le!(msg, 0, u64) };
        } else {
            self.tail |= unsafe { u8to64_le(msg, 0, fill) } << (8 * self.ntail);
            if length < needed {
                self.ntail += length;
                return;
            }
        }
        self.state.v3 ^= self.tail;
        S::c_rounds(&mut self.state);
        self.state.v0 ^= self.tail;
        
        self.ntail = length - needed;
        self.tail = unsafe { u8to64_le(msg, needed, self.ntail) };
    }
}
#[stable(feature = "rust1", since = "1.0.0")]
impl super::Hasher for SipHasher {
    #[inline]
    fn write(&mut self, msg: &[u8]) {
        self.0.hasher.write(msg)
    }
    #[inline]
    fn finish(&self) -> u64 {
        self.0.hasher.finish()
    }
}
#[unstable(feature = "hashmap_internals", issue = "none")]
impl super::Hasher for SipHasher13 {
    #[inline]
    fn write(&mut self, msg: &[u8]) {
        self.hasher.write(msg)
    }
    #[inline]
    fn finish(&self) -> u64 {
        self.hasher.finish()
    }
}
impl<S: Sip> super::Hasher for Hasher<S> {
    
    #[inline]
    fn write_usize(&mut self, i: usize) {
        let bytes = unsafe {
            crate::slice::from_raw_parts(&i as *const usize as *const u8, mem::size_of::<usize>())
        };
        self.short_write(bytes);
    }
    
    #[inline]
    fn write_u8(&mut self, i: u8) {
        self.short_write(&[i]);
    }
    #[inline]
    fn write(&mut self, msg: &[u8]) {
        let length = msg.len();
        self.length += length;
        let mut needed = 0;
        if self.ntail != 0 {
            needed = 8 - self.ntail;
            self.tail |= unsafe { u8to64_le(msg, 0, cmp::min(length, needed)) } << (8 * self.ntail);
            if length < needed {
                self.ntail += length;
                return;
            } else {
                self.state.v3 ^= self.tail;
                S::c_rounds(&mut self.state);
                self.state.v0 ^= self.tail;
                self.ntail = 0;
            }
        }
        
        let len = length - needed;
        let left = len & 0x7;
        let mut i = needed;
        while i < len - left {
            let mi = unsafe { load_int_le!(msg, i, u64) };
            self.state.v3 ^= mi;
            S::c_rounds(&mut self.state);
            self.state.v0 ^= mi;
            i += 8;
        }
        self.tail = unsafe { u8to64_le(msg, i, left) };
        self.ntail = left;
    }
    #[inline]
    fn finish(&self) -> u64 {
        let mut state = self.state;
        let b: u64 = ((self.length as u64 & 0xff) << 56) | self.tail;
        state.v3 ^= b;
        S::c_rounds(&mut state);
        state.v0 ^= b;
        state.v2 ^= 0xff;
        S::d_rounds(&mut state);
        state.v0 ^ state.v1 ^ state.v2 ^ state.v3
    }
}
impl<S: Sip> Clone for Hasher<S> {
    #[inline]
    fn clone(&self) -> Hasher<S> {
        Hasher {
            k0: self.k0,
            k1: self.k1,
            length: self.length,
            state: self.state,
            tail: self.tail,
            ntail: self.ntail,
            _marker: self._marker,
        }
    }
}
impl<S: Sip> Default for Hasher<S> {
    
    #[inline]
    fn default() -> Hasher<S> {
        Hasher::new_with_keys(0, 0)
    }
}
#[doc(hidden)]
trait Sip {
    fn c_rounds(_: &mut State);
    fn d_rounds(_: &mut State);
}
#[derive(Debug, Clone, Default)]
struct Sip13Rounds;
impl Sip for Sip13Rounds {
    #[inline]
    fn c_rounds(state: &mut State) {
        compress!(state);
    }
    #[inline]
    fn d_rounds(state: &mut State) {
        compress!(state);
        compress!(state);
        compress!(state);
    }
}
#[derive(Debug, Clone, Default)]
struct Sip24Rounds;
impl Sip for Sip24Rounds {
    #[inline]
    fn c_rounds(state: &mut State) {
        compress!(state);
        compress!(state);
    }
    #[inline]
    fn d_rounds(state: &mut State) {
        compress!(state);
        compress!(state);
        compress!(state);
        compress!(state);
    }
}