#![allow(dead_code)]
pub mod hq;
pub mod hash_to_binary_tree;
mod test;
mod benchmark;
use super::command::{Command, ComputeDistanceCode, InitCommand, BrotliDistanceParams};
use super::hash_to_binary_tree::{H10, H10Buckets, H10DefaultParams, ZopfliNode};
use super::dictionary_hash::kStaticDictionaryHash;
use super::static_dict::{BROTLI_UNALIGNED_LOAD32, BROTLI_UNALIGNED_LOAD64, FindMatchLengthWithLimit, FindMatchLengthWithLimitMin4};
use super::static_dict::BrotliDictionary;
use super::super::alloc;
use super::super::alloc::{SliceWrapper, SliceWrapperMut, Allocator};
use super::util::{Log2FloorNonZero, brotli_max_size_t, floatX};
use core;
static kBrotliMinWindowBits: i32 = 10i32;

static kBrotliMaxWindowBits: i32 = 24i32;

pub static kInvalidMatch: u32 = 0xfffffffu32;

static kCutoffTransformsCount: u32 = 10u32;

static kCutoffTransforms: u64 = 0x71b520au64 << 32i32 | 0xda2d3200u32 as (u64);

pub static kHashMul32: u32 = 0x1e35a7bdu32;

pub static kHashMul64: u64 = 0x1e35a7bdu64 << 32i32 | 0x1e35a7bdu64;

pub static kHashMul64Long: u64 = 0x1fe35a7bu32 as (u64) << 32i32 | 0xd3579bd3u32 as (u64);


#[derive(PartialEq, Eq, Copy, Clone, Debug)]
#[repr(C)]
pub enum BrotliEncoderMode {
  BROTLI_MODE_GENERIC = 0,
  BROTLI_MODE_TEXT = 1,
  BROTLI_MODE_FONT = 2,
  BROTLI_FORCE_LSB_PRIOR = 3,
  BROTLI_FORCE_MSB_PRIOR = 4,
  BROTLI_FORCE_UTF8_PRIOR = 5,
  BROTLI_FORCE_SIGNED_PRIOR = 6,
}

#[derive(Clone,Copy, Debug, PartialEq)]
pub struct BrotliHasherParams {
  // type of hasher to use (default: type 6, but others have tradeoffs of speed/memory)
  pub type_: i32,
  // number of the number of buckets to have in the hash table (defaults to quality - 1)
  pub bucket_bits: i32,
  // number of potential matches to hold per bucket (hash collisions)
  pub block_bits: i32,
  // number of bytes of a potential match to hash
  pub hash_len: i32,
  // number of previous distance matches to check for future matches (defaults to 16)
  pub num_last_distances_to_check: i32,
  // how much to weigh distance vs an extra byte of copy match when comparing possible copy srcs
  pub literal_byte_score: i32,
}


#[derive(Clone, Debug)]
pub struct BrotliEncoderParams {
  pub dist: BrotliDistanceParams,
  // if this brotli file is generic, font or specifically text
  pub mode: BrotliEncoderMode,
  // quality param between 0 and 11 (11 is smallest but takes longest to encode)
  pub quality: i32,
  pub q9_5: bool,
  // log of how big the ring buffer should be for copying prior data
  pub lgwin: i32,
  // log of how often metablocks should be serialized
  pub lgblock: i32,
  // how big the source file is (or 0 if no hint is provided)
  pub size_hint: usize,
  // avoid serializing out priors for literal sections in the favor of decode speed
  pub disable_literal_context_modeling: i32,
  pub hasher: BrotliHasherParams,
  // produce an IR of the compression file
  pub log_meta_block: bool,
  // attempt to detect how many bytes before the current byte generates the best prediction of it
  pub stride_detection_quality: u8, // 0 = off (stride 1 always) 1 = on per 16th of a file 2 = on per block type switch
  // if nonzero, will search for high entropy strings and log them differently to the IR
  pub high_entropy_detection_quality: u8, // search for high entropy literal strings and annotate them differently
  // if nonzero it will search for the temporal locality and effectiveness of the priors
  // for literals. The best adaptation and forgetfulness will be logged per metablock to the IR
  pub cdf_adaptation_detection: u8,
  // whether to search for whether the previous byte or the context_map are better predictors on a per-context-map basis
  pub prior_bitmask_detection: u8,
  // for prior bitmask detection: stride_low, stride_speed, cm_low, cm_speed
  pub literal_adaptation:[(u16, u16); 4],
  pub large_window: bool,
  // avoid search for the best ndirect vs npostfix parameters for distance
  pub avoid_distance_prefix_search: bool,
  // construct brotli in such a way that it may be concatenated with another brotli file using appropriate bit ops
  pub catable: bool,
  // can use the dictionary (default yes unless catable is set)
  pub use_dictionary: bool,
  // construct brotli in such a way that another concatable brotli file may be appended
  pub appendable: bool,
  // include a magic number and version number and size_hint at the beginning
  pub magic_number: bool,
  // prefer to compute the map of previously seen strings
  // just once for all the threads at the beginning, since they overlap significantly
  pub favor_cpu_efficiency: bool,
}

impl Default for BrotliEncoderParams {
   fn default() -> BrotliEncoderParams {
      super::encode::BrotliEncoderInitParams()
   }
}

#[derive(Clone,Copy,Default,PartialEq)]
pub struct H9Opts{
   pub literal_byte_score: u32,
}
pub enum HowPrepared {
  ALREADY_PREPARED,
  NEWLY_PREPARED,
}
#[derive(Clone, PartialEq)]
pub struct Struct1 {
  pub params: BrotliHasherParams,
  pub is_prepared_: i32,
  pub dict_num_lookups: usize,
  pub dict_num_matches: usize,
}

fn LiteralSpreeLengthForSparseSearch(params: &BrotliEncoderParams) -> usize {
  (if (*params).quality < 9 {
     64i32
   } else {
     512i32
   }) as (usize)
}

fn brotli_min_size_t(a: usize, b: usize) -> usize {
  if a < b { a } else { b }
}


pub struct HasherSearchResult {
  pub len: usize,
  pub len_x_code: usize,
  pub distance: usize,
  pub score: u64,
}

pub trait CloneWithAlloc<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> {
    fn clone_with_alloc(&self, m: &mut Alloc) -> Self;
}

pub trait AnyHasher {
  fn Opts(&self) -> H9Opts;
  fn GetHasherCommon(&mut self) -> &mut Struct1;
  fn HashBytes(&self, data: &[u8]) -> usize;
  fn HashTypeLength(&self) -> usize;
  fn StoreLookahead(&self) -> usize;
  fn PrepareDistanceCache(&self, distance_cache: &mut [i32]);
  fn FindLongestMatch(&mut self,
                      dictionary: Option<&BrotliDictionary>,
                      dictionary_hash: &[u16],
                      data: &[u8],
                      ring_buffer_mask: usize,
                      distance_cache: &[i32],
                      cur_ix: usize,
                      max_length: usize,
                      max_backward: usize,
                      gap: usize,
                      max_distance: usize,
                      out: &mut HasherSearchResult)
                      -> bool;
  fn Store(&mut self, data: &[u8], mask: usize, ix: usize);
  fn Store4Vec4(&mut self, data: &[u8], mask: usize, ix: usize) {
    for i in 0..4 {
      self.Store(data, mask, ix + i * 4);
    }
  }
  fn StoreEvenVec4(&mut self, data: &[u8], mask: usize, ix: usize) {
    for i in 0..4 {
      self.Store(data, mask, ix + i * 2);
    }
  }
  fn StoreRange(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize);
  fn BulkStoreRange(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize);
  fn Prepare(&mut self, one_shot: bool, input_size: usize, data: &[u8]) -> HowPrepared;
  fn StitchToPreviousBlock(&mut self,
                           num_bytes: usize,
                           position: usize,
                           ringbuffer: &[u8],
                           ringbuffer_mask: usize);
}


pub fn StitchToPreviousBlockInternal<T: AnyHasher>(handle: &mut T,
                                                   num_bytes: usize,
                                                   position: usize,
                                                   ringbuffer: &[u8],
                                                   ringbuffer_mask: usize) {
  if num_bytes >= handle.HashTypeLength().wrapping_sub(1) && (position >= 3) {
    handle.Store(ringbuffer, ringbuffer_mask, position.wrapping_sub(3));
    handle.Store(ringbuffer, ringbuffer_mask, position.wrapping_sub(2));
    handle.Store(ringbuffer, ringbuffer_mask, position.wrapping_sub(1));
  }
}

pub fn StoreLookaheadThenStore<T: AnyHasher>(hasher: &mut T, size: usize, dict: &[u8]) {
  let overlap = hasher.StoreLookahead().wrapping_sub(1usize);
  if size > overlap {
    hasher.BulkStoreRange(dict, !(0usize), 0, size - overlap);
  }
}

pub trait BasicHashComputer {
  fn HashBytes(&self, data: &[u8]) -> u32;
  fn BUCKET_BITS(&self) -> i32;
  fn USE_DICTIONARY(&self) -> i32;
  fn BUCKET_SWEEP(&self) -> i32;
}
pub struct BasicHasher<Buckets: SliceWrapperMut<u32> + SliceWrapper<u32> + BasicHashComputer> {
  pub GetHasherCommon: Struct1,
  pub buckets_: Buckets,
  pub h9_opts: H9Opts,
}

impl<A: SliceWrapperMut<u32> + SliceWrapper<u32> + BasicHashComputer> PartialEq<BasicHasher<A>> for BasicHasher<A> {
    fn eq(&self, other: &BasicHasher<A>) -> bool {
        self.GetHasherCommon == other.GetHasherCommon && self.h9_opts == other.h9_opts && self.buckets_.slice() == other.buckets_.slice()
    }
}

impl<T: SliceWrapperMut<u32> + SliceWrapper<u32> + BasicHashComputer> BasicHasher<T> {
    fn StoreRangeOptBasic(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) -> usize {
      let lookahead = 8;
      if ix_end >= ix_start + lookahead * 2{
        let chunk_count = (ix_end - ix_start) / 4;
        for chunk_id in 0..chunk_count {
          let i = (ix_start + chunk_id * 4) & mask;
          let word11 = data.split_at(i).1.split_at(11).0;
          let mixed0 = self.HashBytes(word11);
          let mixed1 = self.HashBytes(word11.split_at(1).1);
          let mixed2 = self.HashBytes(word11.split_at(2).1);
          let mixed3 = self.HashBytes(word11.split_at(3).1);
          let off: u32 = (i >> 3i32).wrapping_rem(self.buckets_.BUCKET_SWEEP() as usize) as (u32);
          let offset0: usize = mixed0 + off as usize;
          let offset1: usize = mixed1 + off as usize;
          let offset2: usize = mixed2 + off as usize;
          let offset3: usize = mixed3 + off as usize;
          self.buckets_.slice_mut()[offset0] = i as u32;
          self.buckets_.slice_mut()[offset1] = i as u32 + 1;
          self.buckets_.slice_mut()[offset2] = i as u32 + 2;
          self.buckets_.slice_mut()[offset3] = i as u32 + 3;
      }
      return ix_start + chunk_count * 4;
    }
    ix_start
  }

}
pub struct H2Sub<AllocU32: alloc::Allocator<u32>> {
  pub buckets_: AllocU32::AllocatedMemory, // 65537
}
impl<T: SliceWrapperMut<u32> + SliceWrapper<u32> + BasicHashComputer> AnyHasher for BasicHasher<T> {
  #[inline(always)]
  fn Opts(&self) -> H9Opts {
     self.h9_opts
  }
  #[allow(unused_variables)]
  fn PrepareDistanceCache(&self, distance_cache: &mut [i32]) {}
  #[inline(always)]
  fn HashTypeLength(&self) -> usize {
    8
  }
  #[inline(always)]
  fn StoreLookahead(&self) -> usize {
    8
  }
  fn StitchToPreviousBlock(&mut self,
                           num_bytes: usize,
                           position: usize,
                           ringbuffer: &[u8],
                           ringbuffer_mask: usize) {
    StitchToPreviousBlockInternal(self, num_bytes, position, ringbuffer, ringbuffer_mask);
  }
  #[inline(always)]
  fn GetHasherCommon(&mut self) -> &mut Struct1 {
    return &mut self.GetHasherCommon;
  }
  #[inline(always)]
  fn HashBytes(&self, data: &[u8]) -> usize {
    self.buckets_.HashBytes(data) as usize
  }
  fn Store(&mut self, data: &[u8], mask: usize, ix: usize) {
    let (_, data_window) = data.split_at((ix & mask) as (usize));
    let key: u32 = self.HashBytes(data_window) as u32;
    let off: u32 = (ix >> 3i32).wrapping_rem(self.buckets_.BUCKET_SWEEP() as usize) as (u32);
    self.buckets_.slice_mut()[key.wrapping_add(off) as (usize)] = ix as (u32);
  }
  fn StoreRange(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) {
    for i in self.StoreRangeOptBasic(data, mask, ix_start, ix_end)..ix_end {
      self.Store(data, mask, i);
    }
  }
  fn BulkStoreRange(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) {
    self.StoreRange(data, mask, ix_start, ix_end);
  }
  fn Prepare(&mut self, one_shot: bool, input_size: usize, data: &[u8]) -> HowPrepared {
    if self.GetHasherCommon.is_prepared_ != 0 {
      return HowPrepared::ALREADY_PREPARED;
    }
    let partial_prepare_threshold = (4 << self.buckets_.BUCKET_BITS()) >> 7;
    if one_shot && input_size <= partial_prepare_threshold {
      for i in 0..input_size {
        let key = self.HashBytes(&data[i..]) as usize;
        let bs = self.buckets_.BUCKET_SWEEP() as usize;
        for item in self.buckets_.slice_mut()[key..(key + bs)].iter_mut() {
          *item = 0;
        }
      }
    } else {
      for item in self.buckets_.slice_mut().iter_mut() {
        *item = 0;
      }
    }
    self.GetHasherCommon.is_prepared_ = 1;
    HowPrepared::NEWLY_PREPARED
  }

  fn FindLongestMatch(&mut self,
                      dictionary: Option<&BrotliDictionary>,
                      dictionary_hash: &[u16],
                      data: &[u8],
                      ring_buffer_mask: usize,
                      distance_cache: &[i32],
                      cur_ix: usize,
                      max_length: usize,
                      max_backward: usize,
                      gap: usize,
                      max_distance: usize,
                      out: &mut HasherSearchResult)
                      -> bool {
    let opts = self.Opts();
    let best_len_in: usize = (*out).len;
    let cur_ix_masked: usize = cur_ix & ring_buffer_mask;
    let key: u32 = self.HashBytes(&data[(cur_ix_masked as (usize))..]) as u32;
    let mut compare_char: i32 = data[(cur_ix_masked.wrapping_add(best_len_in) as (usize))] as (i32);
    let mut best_score: u64 = (*out).score;
    let mut best_len: usize = best_len_in;
    let cached_backward: usize = distance_cache[(0usize)] as (usize);
    let mut prev_ix: usize = cur_ix.wrapping_sub(cached_backward);
    let mut is_match_found: i32 = 0i32;
    (*out).len_x_code = 0usize;
    if prev_ix < cur_ix {
      prev_ix = prev_ix & ring_buffer_mask as (u32) as (usize);
      if compare_char == data[(prev_ix.wrapping_add(best_len) as (usize))] as (i32) {
        let len: usize = FindMatchLengthWithLimitMin4(&data[(prev_ix as (usize))..],
                                                      &data[(cur_ix_masked as (usize))..],
                                                      max_length);
        if len != 0 {
          best_score = BackwardReferenceScoreUsingLastDistance(len, opts);
          best_len = len;
          (*out).len = len;
          (*out).distance = cached_backward;
          (*out).score = best_score;
          compare_char = data[(cur_ix_masked.wrapping_add(best_len) as (usize))] as (i32);
          if self.buckets_.BUCKET_SWEEP() == 1i32 {
            (*self).buckets_.slice_mut()[key as (usize)] = cur_ix as (u32);
            return true;
          } else {
            is_match_found = 1i32;
          }
        }
      }
    }
    let bucket_sweep = self.buckets_.BUCKET_SWEEP();
    if bucket_sweep == 1i32 {
      let backward: usize;
      let len: usize;
      prev_ix = (*self).buckets_.slice()[key as (usize)] as (usize);
      (*self).buckets_.slice_mut()[key as (usize)] = cur_ix as (u32);
      backward = cur_ix.wrapping_sub(prev_ix);
      prev_ix = prev_ix & ring_buffer_mask as (u32) as (usize);
      if compare_char != data[(prev_ix.wrapping_add(best_len_in) as (usize))] as (i32) {
        return false;
      }
      if backward == 0usize || backward > max_backward {
        return false;
      }
      len = FindMatchLengthWithLimitMin4(&data[(prev_ix as (usize))..],
                                     &data[(cur_ix_masked as (usize))..],
                                     max_length);
      if len != 0 {
        (*out).len = len;
        (*out).distance = backward;
        (*out).score = BackwardReferenceScore(len, backward, opts);
        return true;
      }
    } else {
      for prev_ix_ref in self.buckets_.slice().split_at(key as usize).1[..bucket_sweep as usize].iter() {
        let mut prev_ix = *prev_ix_ref as usize;
        let backward: usize = cur_ix.wrapping_sub(prev_ix);
        prev_ix = prev_ix & ring_buffer_mask as (u32) as (usize);
        if compare_char != data[(prev_ix.wrapping_add(best_len) as (usize))] as (i32) {
          continue;
        }
        if backward == 0usize || backward > max_backward {
          continue;
        }
        let len = FindMatchLengthWithLimitMin4(&data[(prev_ix as (usize))..],
                                           &data[(cur_ix_masked as (usize))..],
                                           max_length);
        if len != 0 {
          let score: u64 = BackwardReferenceScore(len, backward, opts);
          if best_score < score {
            best_score = score;
            best_len = len;
            (*out).len = best_len;
            (*out).distance = backward;
            (*out).score = score;
            compare_char = data[(cur_ix_masked.wrapping_add(best_len) as (usize))] as (i32);
            is_match_found = 1i32;
          }
        }
      }
    }
    if dictionary.is_some() && self.buckets_.USE_DICTIONARY() != 0 && (is_match_found == 0) {
      is_match_found = SearchInStaticDictionary(dictionary.unwrap(),
                                                dictionary_hash,
                                                self,
                                                &data[(cur_ix_masked as (usize))..],
                                                max_length,
                                                max_backward.wrapping_add(gap),
                                                max_distance,
                                                out,
                                                1i32);
    }
    (*self).buckets_.slice_mut()[(key as (usize)).wrapping_add((cur_ix >> 3)
                                    .wrapping_rem(bucket_sweep as usize))] = cur_ix as (u32);
    is_match_found != 0

  }
}
impl<AllocU32: alloc::Allocator<u32>> BasicHashComputer for H2Sub<AllocU32> {
  fn HashBytes(&self, data: &[u8]) -> u32 {
    let h: u64 = (BROTLI_UNALIGNED_LOAD64(data) << 64i32 - 8i32 * 5i32).wrapping_mul(kHashMul64);
    (h >> 64i32 - 16i32) as (u32)
  }
  fn BUCKET_BITS(&self) -> i32 {
    16
  }
  fn BUCKET_SWEEP(&self) -> i32 {
    1
  }
  fn USE_DICTIONARY(&self) -> i32 {
    1
  }
}
impl<AllocU32: alloc::Allocator<u32>> SliceWrapperMut<u32> for H2Sub<AllocU32> {
  fn slice_mut(&mut self) -> &mut [u32] {
    return self.buckets_.slice_mut();
  }
}
impl<AllocU32: alloc::Allocator<u32>> SliceWrapper<u32> for H2Sub<AllocU32> {
  fn slice(&self) -> &[u32] {
    return self.buckets_.slice();
  }
}
pub struct H3Sub<AllocU32: alloc::Allocator<u32>> {
  pub buckets_: AllocU32::AllocatedMemory, // 65538
}
impl<AllocU32: alloc::Allocator<u32>> SliceWrapperMut<u32> for H3Sub<AllocU32> {
  fn slice_mut(&mut self) -> &mut [u32] {
    return self.buckets_.slice_mut();
  }
}
impl<AllocU32: alloc::Allocator<u32>> SliceWrapper<u32> for H3Sub<AllocU32> {
  fn slice(&self) -> &[u32] {
    return self.buckets_.slice();
  }
}
impl<AllocU32: alloc::Allocator<u32>> BasicHashComputer for H3Sub<AllocU32> {
  fn BUCKET_BITS(&self) -> i32 {
    16
  }
  fn BUCKET_SWEEP(&self) -> i32 {
    2
  }
  fn USE_DICTIONARY(&self) -> i32 {
    0
  }
  fn HashBytes(&self, data: &[u8]) -> u32 {
    let h: u64 = (BROTLI_UNALIGNED_LOAD64(data) << 64i32 - 8i32 * 5i32).wrapping_mul(kHashMul64);
    (h >> 64i32 - 16i32) as (u32)
  }
}
pub struct H4Sub<AllocU32: alloc::Allocator<u32>> {
  pub buckets_: AllocU32::AllocatedMemory, // 131076
}
impl<AllocU32: alloc::Allocator<u32>> BasicHashComputer for H4Sub<AllocU32> {
  fn BUCKET_BITS(&self) -> i32 {
    17
  }
  fn BUCKET_SWEEP(&self) -> i32 {
    4
  }
  fn USE_DICTIONARY(&self) -> i32 {
    1
  }
  fn HashBytes(&self, data: &[u8]) -> u32 {
    let h: u64 = (BROTLI_UNALIGNED_LOAD64(data) << 64i32 - 8i32 * 5i32).wrapping_mul(kHashMul64);
    (h >> 64i32 - 17i32) as (u32)
  }
}
impl<AllocU32: alloc::Allocator<u32>> SliceWrapperMut<u32> for H4Sub<AllocU32> {
  fn slice_mut(&mut self) -> &mut [u32] {
    return self.buckets_.slice_mut();
  }
}
impl<AllocU32: alloc::Allocator<u32>> SliceWrapper<u32> for H4Sub<AllocU32> {
  fn slice(&self) -> &[u32] {
    return self.buckets_.slice();
  }
}
pub struct H54Sub<AllocU32: alloc::Allocator<u32>> {
  pub buckets_: AllocU32::AllocatedMemory,
}
impl<AllocU32: alloc::Allocator<u32>> BasicHashComputer for H54Sub<AllocU32> {
  fn BUCKET_BITS(&self) -> i32 {
    20
  }
  fn BUCKET_SWEEP(&self) -> i32 {
    4
  }
  fn USE_DICTIONARY(&self) -> i32 {
    0
  }
  fn HashBytes(&self, data: &[u8]) -> u32 {
    let h: u64 = (BROTLI_UNALIGNED_LOAD64(data) << 64i32 - 8i32 * 7i32).wrapping_mul(kHashMul64);
    (h >> 64i32 - 20i32) as (u32)
  }
}


impl<AllocU32: alloc::Allocator<u32>> SliceWrapperMut<u32> for H54Sub<AllocU32> {
  fn slice_mut(&mut self) -> &mut [u32] {
    return self.buckets_.slice_mut();
  }
}
impl<AllocU32: alloc::Allocator<u32>> SliceWrapper<u32> for H54Sub<AllocU32> {
  fn slice(&self) -> &[u32] {
    return self.buckets_.slice();
  }
}
pub const H9_BUCKET_BITS :usize = 15;
pub const H9_BLOCK_BITS :usize =8;
pub const H9_NUM_LAST_DISTANCES_TO_CHECK:usize = 16;
const H9_BLOCK_MASK :usize= (1 << H9_BLOCK_BITS) - 1;


impl H9Opts {
   pub fn new(params:&BrotliHasherParams) -> H9Opts {
      H9Opts {
         literal_byte_score: if params.literal_byte_score != 0 { params.literal_byte_score as u32} else {540},
      }
   }
}

fn adv_prepare_distance_cache(distance_cache: &mut [i32], num_distances: i32) {
        if num_distances > 4i32 {
            let last_distance: i32 = distance_cache[(0usize)];
            distance_cache[(4usize)] = last_distance - 1i32;
            distance_cache[(5usize)] = last_distance + 1i32;
            distance_cache[(6usize)] = last_distance - 2i32;
            distance_cache[(7usize)] = last_distance + 2i32;
            distance_cache[(8usize)] = last_distance - 3i32;
            distance_cache[(9usize)] = last_distance + 3i32;
            if num_distances > 10i32 {
                let next_last_distance: i32 = distance_cache[(1usize)];
                distance_cache[(10usize)] = next_last_distance - 1i32;
                distance_cache[(11usize)] = next_last_distance + 1i32;
                distance_cache[(12usize)] = next_last_distance - 2i32;
                distance_cache[(13usize)] = next_last_distance + 2i32;
                distance_cache[(14usize)] = next_last_distance - 3i32;
                distance_cache[(15usize)] = next_last_distance + 3i32;
            }
        }
}

pub const kDistanceCacheIndex : [u8;16] = [
    0, 1, 2, 3, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1,
];

pub const kDistanceCacheOffset : [i8;16]= [
    0i8,
    0i8,
    0i8,
    0i8,
    -1i8,
    1i8,
    -2i8,
    2i8,
    -3i8,
    3i8,
    -1i8,
    1i8,
    -2i8,
    2i8,
    -3i8,
    3i8];

//const BROTLI_LITERAL_BYTE_SCORE: u64 = 540;
const BROTLI_DISTANCE_BIT_PENALTY: u32 = 120;


// Score must be positive after applying maximal penalty.
const BROTLI_SCORE_BASE : u32 = (BROTLI_DISTANCE_BIT_PENALTY * 8 * 8/* sizeof usize*/);
const kDistanceShortCodeCost : [u32;16] = [
  /* Repeat last */
  BROTLI_SCORE_BASE +  60,
  /* 2nd, 3rd, 4th last */
  BROTLI_SCORE_BASE -  95,
  BROTLI_SCORE_BASE - 117,
  BROTLI_SCORE_BASE - 127,
  /* Last with offset */
  BROTLI_SCORE_BASE -  93,
  BROTLI_SCORE_BASE -  93,
  BROTLI_SCORE_BASE -  96,
  BROTLI_SCORE_BASE -  96,
  BROTLI_SCORE_BASE -  99,
  BROTLI_SCORE_BASE -  99,
  /* 2nd last with offset */
  BROTLI_SCORE_BASE - 105,
  BROTLI_SCORE_BASE - 105,
  BROTLI_SCORE_BASE - 115,
  BROTLI_SCORE_BASE - 115,
  BROTLI_SCORE_BASE - 125,
  BROTLI_SCORE_BASE - 125
];

pub trait AdvHashSpecialization : PartialEq<Self>{
  #[inline(always)]
  fn get_hash_mask(&self) -> u64;
  #[inline(always)]
  fn set_hash_mask(&mut self, params_hash_len: i32);
  #[inline(always)]
  fn get_k_hash_mul(&self) -> u64;
  #[inline(always)]
  fn HashTypeLength(&self) -> usize;
  #[inline(always)]
  fn StoreLookahead(&self) -> usize;
    #[inline(always)]
  fn load_and_mix_word(&self, data: &[u8]) -> u64;
    #[inline(always)]
  fn hash_shift(&self) -> i32;
    #[inline(always)]
  fn bucket_size(&self) -> u32;
    #[inline(always)]
  fn block_mask(&self) -> u32;
    #[inline(always)]
  fn block_size(&self) -> u32;
  #[inline(always)]
  fn block_bits(&self) -> i32;
}
pub struct AdvHasher<Specialization: AdvHashSpecialization + Sized + Clone,
                     Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>>
{
  pub GetHasherCommon: Struct1,
  pub specialization: Specialization, // contains hash_mask_
  pub num: <Alloc as Allocator<u16>>::AllocatedMemory,
  pub buckets: <Alloc as Allocator<u32>>::AllocatedMemory,
  pub h9_opts: H9Opts,
}

impl<Specialization: AdvHashSpecialization + Sized + Clone,
     Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> PartialEq<AdvHasher<Specialization, Alloc>> for AdvHasher<Specialization, Alloc> {
  fn eq(&self, other: &Self) -> bool {
    self.GetHasherCommon == other.GetHasherCommon
      && self.specialization == other.specialization
      && self.num.slice() == other.num.slice()
      && self.buckets.slice() == other.buckets.slice()
      && self.h9_opts == other.h9_opts
  }
}


#[derive(Clone, PartialEq)]
pub struct HQ5Sub {}
impl AdvHashSpecialization for HQ5Sub {
  #[inline(always)]
  fn hash_shift(&self) -> i32 {
    32i32 - 14 // 32 - bucket_bits
  }
  #[inline(always)]
  fn bucket_size(&self) -> u32 {
    1 << 14
  }
  #[inline(always)]
  fn block_bits(&self) -> i32 {
    4
  }
  #[inline(always)]
  fn block_size(&self) -> u32 {
    1 << 4
  }
  #[inline(always)]
  fn block_mask(&self) -> u32 {
    (1 << 4) - 1
  }
  #[inline(always)]
  fn get_hash_mask(&self) -> u64 {
    //return 0xffffffffffffffffu64;
    return 0xffffffffu64; // make it 32 bit
  }
  #[inline(always)]
  fn get_k_hash_mul(&self) -> u64 {
    return kHashMul32 as u64;
  }
  #[inline(always)]
  fn load_and_mix_word(&self, data: &[u8]) -> u64 {
    return (BROTLI_UNALIGNED_LOAD32(data) as u64 * self.get_k_hash_mul()) & self.get_hash_mask();
  }
  #[inline(always)]
  fn set_hash_mask(&mut self, _params_hash_len: i32) {}
  fn HashTypeLength(&self) -> usize {
    4
  }
  #[inline(always)]
  fn StoreLookahead(&self) -> usize {
    4
  }
}


#[derive(Clone, PartialEq)]
pub struct HQ7Sub {}
impl AdvHashSpecialization for HQ7Sub {
  #[inline(always)]
  fn hash_shift(&self) -> i32 {
    32i32 - 15 // 32 - bucket_bits
  }
  #[inline(always)]
  fn bucket_size(&self) -> u32 {
    1 << 15
  }
  #[inline(always)]
  fn block_bits(&self) -> i32 {
    6
  }
  #[inline(always)]
  fn block_size(&self) -> u32 {
    1 << 6
  }
  #[inline(always)]
  fn block_mask(&self) -> u32 {
    (1 << 6) - 1
  }
  #[inline(always)]
  fn get_hash_mask(&self) -> u64 {
    //return 0xffffffffffffffffu64;
    return 0xffffffffu64; // make it 32 bit
  }
  #[inline(always)]
  fn get_k_hash_mul(&self) -> u64 {
    return kHashMul32 as u64;
  }
  #[inline(always)]
  fn load_and_mix_word(&self, data: &[u8]) -> u64 {
    return (BROTLI_UNALIGNED_LOAD32(data) as u64 * self.get_k_hash_mul()) & self.get_hash_mask();
  }
  #[inline(always)]
  fn set_hash_mask(&mut self, _params_hash_len: i32) {}
  fn HashTypeLength(&self) -> usize {
    4
  }
  #[inline(always)]
  fn StoreLookahead(&self) -> usize {
    4
  }
}


#[derive(Clone, PartialEq)]
pub struct H9Sub {}
impl AdvHashSpecialization for H9Sub {
  #[inline(always)]
  fn hash_shift(&self) -> i32 {
    32i32 - H9_BUCKET_BITS as i32 // 32 - bucket_bits
  }
  #[inline(always)]
  fn bucket_size(&self) -> u32 {
    1 << H9_BUCKET_BITS
  }
  #[inline(always)]
  fn block_bits(&self) -> i32 {
    H9_BLOCK_BITS as i32
  }
  #[inline(always)]
  fn block_size(&self) -> u32 {
    1 << H9_BLOCK_BITS
  }
  #[inline(always)]
  fn block_mask(&self) -> u32 {
    (1 << H9_BLOCK_BITS) - 1
  }
  #[inline(always)]
  fn get_hash_mask(&self) -> u64 {
    //return 0xffffffffffffffffu64;
    return 0xffffffffu64; // make it 32 bit
  }
  #[inline(always)]
  fn get_k_hash_mul(&self) -> u64 {
    return kHashMul32 as u64;
  }
  #[inline(always)]
  fn load_and_mix_word(&self, data: &[u8]) -> u64 {
    return (BROTLI_UNALIGNED_LOAD32(data) as u64 * self.get_k_hash_mul()) & self.get_hash_mask();
  }
  #[inline(always)]
  fn set_hash_mask(&mut self, _params_hash_len: i32) {}
  fn HashTypeLength(&self) -> usize {
    4
  }
  #[inline(always)]
  fn StoreLookahead(&self) -> usize {
    4
  }
}


#[derive(Clone, PartialEq)]
pub struct H5Sub {
  pub hash_shift_: i32,
  pub bucket_size_: u32,
  pub block_mask_:u32,
  pub block_bits_: i32,
}

impl AdvHashSpecialization for H5Sub {
  #[inline(always)]
  fn hash_shift(&self) -> i32 {
    return self.hash_shift_
  }
  fn bucket_size(&self) -> u32 {
    return self.bucket_size_
  }
  fn block_bits(&self) -> i32 {
    self.block_bits_
  }
  fn block_size(&self) -> u32 {
    1 << self.block_bits_
  }
  fn block_mask(&self) -> u32 {
    return self.block_mask_
  }
  fn get_hash_mask(&self) -> u64 {
    //return 0xffffffffffffffffu64;
    return 0xffffffffu64; // make it 32 bit
  }
  fn get_k_hash_mul(&self) -> u64 {
    return kHashMul32 as u64;
  }
  fn load_and_mix_word(&self, data: &[u8]) -> u64 {
    return (BROTLI_UNALIGNED_LOAD32(data) as u64 * self.get_k_hash_mul()) & self.get_hash_mask();
  }
  #[allow(unused_variables)]
  fn set_hash_mask(&mut self, params_hash_len: i32) {}
  fn HashTypeLength(&self) -> usize {
    4
  }
  fn StoreLookahead(&self) -> usize {
    4
  }
}

#[derive(Clone, PartialEq)]
pub struct H6Sub {
  pub hash_mask: u64,
  pub hash_shift_: i32,
  pub bucket_size_: u32,
  pub block_mask_:u32,
  pub block_bits_: i32,
}

impl AdvHashSpecialization for H6Sub {
  #[inline(always)]
  fn hash_shift(&self) -> i32 {
    return self.hash_shift_
  }
  #[inline(always)]
  fn bucket_size(&self) -> u32 {
    return self.bucket_size_
  }
  fn block_bits(&self) -> i32 {
    self.block_bits_
  }
  fn block_size(&self) -> u32 {
    1 << self.block_bits_
  }
  #[inline(always)]
  fn block_mask(&self) -> u32 {
    return self.block_mask_
  }
  #[inline(always)]
  fn get_hash_mask(&self) -> u64 {
    self.hash_mask
  }
  #[inline(always)]
  fn set_hash_mask(&mut self, params_hash_len: i32) {
    self.hash_mask = !(0u32 as (u64)) >> 64i32 - 8i32 * params_hash_len;
  }
  #[inline(always)]
  fn get_k_hash_mul(&self) -> u64 {
    kHashMul64Long
  }
  #[inline(always)]
  fn load_and_mix_word(&self, data: &[u8]) -> u64 {
    return (BROTLI_UNALIGNED_LOAD64(data) & self.get_hash_mask())
             .wrapping_mul(self.get_k_hash_mul());
  }
  #[inline(always)]
  fn HashTypeLength(&self) -> usize {
    8
  }
  #[inline(always)]
  fn StoreLookahead(&self) -> usize {
    8
  }
}

fn BackwardReferencePenaltyUsingLastDistance(distance_short_code: usize) -> u64 {
  (39u64).wrapping_add((0x1ca10u64 >> (distance_short_code & 0xeusize) & 0xeu64))
}

impl<Specialization: AdvHashSpecialization + Clone, Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> AdvHasher<Specialization, Alloc> {
  // 7 opt
  // returns a new ix_start
  fn StoreRangeOptBatch(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) -> usize {
    let lookahead = self.specialization.StoreLookahead();
    if ix_end >= ix_start + lookahead * 2 && lookahead == 4{
      let num = self.num.slice_mut();
      let buckets = self.buckets.slice_mut();
      assert_eq!(num.len(), self.specialization.bucket_size() as usize);
      assert_eq!(buckets.len(), self.specialization.bucket_size() as usize * self.specialization.block_size() as usize);
      let shift = self.specialization.hash_shift();
      let chunk_count = (ix_end - ix_start) / 4;
      for chunk_id in 0..chunk_count {
        let i = (ix_start + chunk_id * 4) & mask;
        let ffffffff = 0xffffffff;
        let word = u64::from(data[i])
          | (u64::from(data[i + 1]) << 8)
          | (u64::from(data[i + 2]) << 16)
          | (u64::from(data[i + 3]) << 24)
          | (u64::from(data[i + 4]) << 32)
          | (u64::from(data[i + 5]) << 40)
          | (u64::from(data[i + 6]) << 48);
          let mixed0 = ((((word & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mixed1 = (((((word >> 8) & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mixed2 = (((((word >> 16) & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mixed3 = (((((word >> 24) & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mut num_ref0 = u32::from(num[mixed0]);
          num[mixed0] = num_ref0.wrapping_add(1) as u16;
          num_ref0 &= (*self).specialization.block_mask();
          let mut num_ref1 = u32::from(num[mixed1]);
          num[mixed1] = num_ref1.wrapping_add(1) as u16;
          num_ref1 &= (*self).specialization.block_mask();
          let mut num_ref2 = u32::from(num[mixed2]);
          num[mixed2] = num_ref2.wrapping_add(1) as u16;
          num_ref2 &= (*self).specialization.block_mask();
          let mut num_ref3 = u32::from(num[mixed3]);
          num[mixed3] = num_ref3.wrapping_add(1) as u16;
          num_ref3 &= (*self).specialization.block_mask();
          let offset0: usize = (mixed0 << self.specialization.block_bits()) + num_ref0 as usize;
          let offset1: usize = (mixed1 << self.specialization.block_bits()) + num_ref1 as usize;
          let offset2: usize = (mixed2 << self.specialization.block_bits()) + num_ref2 as usize;
          let offset3: usize = (mixed3 << self.specialization.block_bits()) + num_ref3 as usize;
          buckets[offset0] = (i) as u32;
          buckets[offset1] = (i + 1) as u32;
          buckets[offset2] = (i + 2) as u32;
          buckets[offset3] = (i + 3) as u32;
      }
      return ix_start + chunk_count * 4;
    }
    ix_start
  }

  fn BulkStoreRangeOptMemFetch(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) -> usize {
      const REG_SIZE : usize = 32usize;
    let lookahead = self.specialization.StoreLookahead();
      if mask == !0 && ix_end > ix_start + REG_SIZE && lookahead == 4{
      const lookahead4: usize = 4;
      assert_eq!(lookahead4, lookahead);
      let mut data64 = [0u8;REG_SIZE + lookahead4 - 1];
      let del = (ix_end - ix_start) / REG_SIZE;
      let num = self.num.slice_mut();
      let buckets = self.buckets.slice_mut();
      assert_eq!(num.len(), self.specialization.bucket_size() as usize);
      assert_eq!(buckets.len(), self.specialization.bucket_size() as usize * self.specialization.block_size() as usize);
      let shift = self.specialization.hash_shift();
      for chunk_id in 0..del {
        let ix_offset = ix_start + chunk_id * REG_SIZE;
        data64[..REG_SIZE + lookahead4 - 1].clone_from_slice(data.split_at(ix_offset).1.split_at(REG_SIZE + lookahead4 - 1).0);
        for quad_index in 0..(REG_SIZE>>2) {
          let i = quad_index<<2;
          let ffffffff = 0xffffffff;
          let word = u64::from(data64[i])
            | (u64::from(data64[i + 1]) << 8)
            | (u64::from(data64[i + 2]) << 16)
            | (u64::from(data64[i + 3]) << 24)
            | (u64::from(data64[i + 4]) << 32)
            | (u64::from(data64[i + 5]) << 40)
            | (u64::from(data64[i + 6]) << 48);
          let mixed0 = ((((word & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mixed1 = (((((word >> 8) & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mixed2 = (((((word >> 16) & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mixed3 = (((((word >> 24) & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mut num_ref0 = u32::from(num[mixed0]);
          num[mixed0] = num_ref0.wrapping_add(1) as u16;
          num_ref0 &= (*self).specialization.block_mask();
          let mut num_ref1 = u32::from(num[mixed1]);
          num[mixed1] = num_ref1.wrapping_add(1) as u16;
          num_ref1 &= (*self).specialization.block_mask();
          let mut num_ref2 = u32::from(num[mixed2]);
          num[mixed2] = num_ref2.wrapping_add(1) as u16;
          num_ref2 &= (*self).specialization.block_mask();
          let mut num_ref3 = u32::from(num[mixed3]);
          num[mixed3] = num_ref3.wrapping_add(1) as u16;
          num_ref3 &= (*self).specialization.block_mask();
          let offset0: usize = (mixed0 << self.specialization.block_bits()) + num_ref0 as usize;
          let offset1: usize = (mixed1 << self.specialization.block_bits()) + num_ref1 as usize;
          let offset2: usize = (mixed2 << self.specialization.block_bits()) + num_ref2 as usize;
          let offset3: usize = (mixed3 << self.specialization.block_bits()) + num_ref3 as usize;
          buckets[offset0] = (ix_offset + i) as u32;
          buckets[offset1] = (ix_offset + i + 1) as u32;
          buckets[offset2] = (ix_offset + i + 2) as u32;
          buckets[offset3] = (ix_offset + i + 3) as u32;
        }
      }
      return ix_start + del * REG_SIZE;
      }
    ix_start
  }
  fn BulkStoreRangeOptMemFetchLazyDupeUpdate(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) -> usize {
    const REG_SIZE : usize = 32usize;
    let lookahead = self.specialization.StoreLookahead();
    if mask == !0 && ix_end > ix_start + REG_SIZE && lookahead == 4{
      const lookahead4: usize = 4;
      assert_eq!(lookahead4, lookahead);
      let mut data64 = [0u8;REG_SIZE + lookahead4];
      let del = (ix_end - ix_start) / REG_SIZE;
      let num = self.num.slice_mut();
      let buckets = self.buckets.slice_mut();
      assert_eq!(num.len(), self.specialization.bucket_size() as usize);
      assert_eq!(buckets.len(), self.specialization.bucket_size() as usize * self.specialization.block_size() as usize);
      let shift = self.specialization.hash_shift();
      for chunk_id in 0..del {
        let ix_offset = ix_start + chunk_id * REG_SIZE;
        data64[..REG_SIZE + lookahead4].clone_from_slice(data.split_at(ix_offset).1.split_at(REG_SIZE + lookahead4).0);
        for quad_index in 0..(REG_SIZE>>2) {
          let i = quad_index<<2;
          let ffffffff = 0xffffffff;
          let word = u64::from(data64[i])
            | (u64::from(data64[i + 1]) << 8)
            | (u64::from(data64[i + 2]) << 16)
            | (u64::from(data64[i + 3]) << 24)
            | (u64::from(data64[i + 4]) << 32)
            | (u64::from(data64[i + 5]) << 40)
            | (u64::from(data64[i + 6]) << 48);
          let mixed0 = ((((word & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mixed1 = (((((word >> 8) & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mixed2 = (((((word >> 16) & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mixed3 = (((((word >> 24) & ffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
          let mut num_ref0 = u32::from(num[mixed0]);
          let mut num_ref1 = u32::from(num[mixed1]);
          let mut num_ref2 = u32::from(num[mixed2]);
          let mut num_ref3 = u32::from(num[mixed3]);
          num[mixed0] = num_ref0.wrapping_add(1) as u16;
          num[mixed1] = num_ref1.wrapping_add(1) as u16;
          num[mixed2] = num_ref2.wrapping_add(1) as u16;
          num[mixed3] = num_ref3.wrapping_add(1) as u16;
          num_ref0 &= (*self).specialization.block_mask();
          num_ref1 &= (*self).specialization.block_mask();
          num_ref2 &= (*self).specialization.block_mask();
          num_ref3 &= (*self).specialization.block_mask();
          let offset0: usize = (mixed0 << self.specialization.block_bits()) + num_ref0 as usize;
          let offset1: usize = (mixed1 << self.specialization.block_bits()) + num_ref1 as usize;
          let offset2: usize = (mixed2 << self.specialization.block_bits()) + num_ref2 as usize;
          let offset3: usize = (mixed3 << self.specialization.block_bits()) + num_ref3 as usize;
          buckets[offset0] = (ix_offset + i) as u32;
          buckets[offset1] = (ix_offset + i + 1) as u32;
          buckets[offset2] = (ix_offset + i + 2) as u32;
          buckets[offset3] = (ix_offset + i + 3) as u32;
        }
      }
      return ix_start + del * REG_SIZE;
    }
    ix_start
  }
  fn BulkStoreRangeOptRandomDupeUpdate(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) -> usize {
    const REG_SIZE : usize = 32usize;
    let lookahead = self.specialization.StoreLookahead();
    if mask == !0 && ix_end > ix_start + REG_SIZE && lookahead == 4{
      const lookahead4: usize = 4;
      assert_eq!(lookahead4, lookahead);
      let mut data64 = [0u8;REG_SIZE + lookahead4];
      let del = (ix_end - ix_start) / REG_SIZE;
      let num = self.num.slice_mut();
      let buckets = self.buckets.slice_mut();
      assert_eq!(num.len(), self.specialization.bucket_size() as usize);
      assert_eq!(buckets.len(), self.specialization.bucket_size() as usize * self.specialization.block_size() as usize);
      let shift = self.specialization.hash_shift();
      for chunk_id in 0..del {
        let ix_offset = ix_start + chunk_id * REG_SIZE;
        data64[..REG_SIZE + lookahead4].clone_from_slice(data.split_at(ix_offset).1.split_at(REG_SIZE + lookahead4).0);
        for i in 0..REG_SIZE {
          let mixed_word = ((u32::from(data64[i])
                             | (u32::from(data64[i + 1]) << 8)
                             | (u32::from(data64[i + 2]) << 16)
                             | (u32::from(data64[i + 3]) << 24)) as u64
                            * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask();
          let key = mixed_word >> shift;
          let minor_ix: usize = chunk_id&(*self).specialization.block_mask() as usize;//   *num_ref as usize & (*self).specialization.block_mask() as usize; //GIGANTIC HAX: overwrite firsst option
          let offset: usize = minor_ix + (key << self.specialization.block_bits()) as usize;
          buckets[offset] = (ix_offset + i) as u32;
        }
      }
      for (bucket_index, num_ref) in num.iter_mut().enumerate() {
        let region = buckets.split_at_mut(bucket_index << self.specialization.block_bits()).1.split_at_mut( self.specialization.block_size() as usize).0;
        let mut lnum = 0usize;
        for block_index in 0..self.specialization.block_size() as usize{
          if region[block_index] != 0 {
            let byte_addr = region[block_index];
            region[lnum] = byte_addr;
            lnum += 1;
          }
        }
        *num_ref = lnum as u16;
      }
      return ix_start + del * REG_SIZE;
    }
    ix_start
  }
}

impl<Specialization: AdvHashSpecialization + Clone, Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> AnyHasher
  for AdvHasher<Specialization, Alloc> {
  fn Opts(&self) -> H9Opts {
     self.h9_opts
  }
  fn PrepareDistanceCache(&self, distance_cache: &mut [i32]){
    let num_distances = self.GetHasherCommon.params.num_last_distances_to_check;
    adv_prepare_distance_cache(distance_cache, num_distances);
  }
  fn StitchToPreviousBlock(&mut self,
                           num_bytes: usize,
                           position: usize,
                           ringbuffer: &[u8],
                           ringbuffer_mask: usize) {
      StitchToPreviousBlockInternal(self,
                                    num_bytes,
                                    position,
                                    ringbuffer,
                                    ringbuffer_mask);
  }
  fn Prepare(&mut self, one_shot: bool, input_size:usize, data:&[u8]) ->HowPrepared {
      if self.GetHasherCommon.is_prepared_ != 0 {
          return HowPrepared::ALREADY_PREPARED;
      }
      let partial_prepare_threshold = self.specialization.bucket_size() as usize >> 6;
      if one_shot && input_size <= partial_prepare_threshold {
        for i in 0..input_size {
          let key = self.HashBytes(&data[i..]);
          self.num.slice_mut()[key] = 0;
        }
      } else {
        for item in self.num.slice_mut()[..(self.specialization.bucket_size() as usize)].iter_mut() {
          *item =0;
        }
      }
      self.GetHasherCommon.is_prepared_ = 1;
      HowPrepared::NEWLY_PREPARED
  }

  fn GetHasherCommon(&mut self) -> &mut Struct1 {
    &mut self.GetHasherCommon
  }
  fn HashTypeLength(&self) -> usize {
     self.specialization.HashTypeLength()
  }
  fn StoreLookahead(&self) -> usize {
     self.specialization.StoreLookahead()
  }
  fn HashBytes(&self, data: &[u8]) -> usize {
    let shift = self.specialization.hash_shift();
    let h: u64 = self.specialization.load_and_mix_word(data);
    (h >> shift) as (u32) as usize
  }
  fn StoreEvenVec4(&mut self, data: &[u8], mask: usize, ix: usize) {
    if self.specialization.StoreLookahead() != 4 {
      for i in 0..4 {
        self.Store(data, mask, ix + i * 2);
      }
      return;
    }
    let shift = self.specialization.hash_shift();
    let num = self.num.slice_mut();
    let buckets = self.buckets.slice_mut();
    let li = ix & mask;
    let lword = u64::from(data[li])
      | (u64::from(data[li + 1]) << 8)
      | (u64::from(data[li + 2]) << 16)
      | (u64::from(data[li + 3]) << 24)
      | (u64::from(data[li + 4]) << 32)
      | (u64::from(data[li + 5]) << 40)
      | (u64::from(data[li + 6]) << 48)
      | (u64::from(data[li + 7]) << 56);
    let hi = (ix + 8) & mask;
    let hword = u64::from(data[hi])
      | (u64::from(data[hi + 1]) << 8);
    let mixed0 = ((((lword & 0xffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
    let mixed1 = (((((lword >> 16) & 0xffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
    let mixed2 = (((((lword >> 32) & 0xffffffff) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
    let mixed3 = ((((((hword & 0xffff) << 16) | ((lword >> 48) & 0xffff)) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
    let mut num_ref0 = u32::from(num[mixed0]);
    num[mixed0] = num_ref0.wrapping_add(1) as u16;
    num_ref0 &= (*self).specialization.block_mask();
    let mut num_ref1 = u32::from(num[mixed1]);
    num[mixed1] = num_ref1.wrapping_add(1) as u16;
    num_ref1 &= (*self).specialization.block_mask();
    let mut num_ref2 = u32::from(num[mixed2]);
    num[mixed2] = num_ref2.wrapping_add(1) as u16;
    num_ref2 &= (*self).specialization.block_mask();
    let mut num_ref3 = u32::from(num[mixed3]);
    num[mixed3] = num_ref3.wrapping_add(1) as u16;
    num_ref3 &= (*self).specialization.block_mask();
    let offset0: usize = (mixed0 << self.specialization.block_bits()) + num_ref0 as usize;
    let offset1: usize = (mixed1 << self.specialization.block_bits()) + num_ref1 as usize;
    let offset2: usize = (mixed2 << self.specialization.block_bits()) + num_ref2 as usize;
    let offset3: usize = (mixed3 << self.specialization.block_bits()) + num_ref3 as usize;
    buckets[offset0] = ix as u32;
    buckets[offset1] = (ix + 2) as u32;
    buckets[offset2] = (ix + 4) as u32;
    buckets[offset3] = (ix + 6) as u32;
  }
  fn Store4Vec4(&mut self, data: &[u8], mask: usize, ix: usize) {
    if self.specialization.StoreLookahead() != 4 {
      for i in 0..4 {
        self.Store(data, mask, ix + i * 4);
      }
      return;
    }
    let shift = self.specialization.hash_shift();
    let num = self.num.slice_mut();
    let buckets = self.buckets.slice_mut();
    let li = ix & mask;
    let llword = u32::from(data[li])
      | (u32::from(data[li + 1]) << 8)
      | (u32::from(data[li + 2]) << 16)
      | (u32::from(data[li + 3]) << 24);
    let luword = u32::from(data[li + 4])
      | (u32::from(data[li + 5]) << 8)
      | (u32::from(data[li + 6]) << 16)
      | (u32::from(data[li + 7]) << 24);
    let ui = (ix + 8) & mask;
    let ulword = u32::from(data[ui])
      | (u32::from(data[ui + 1]) << 8)
      | (u32::from(data[ui + 2]) << 16)
      | (u32::from(data[ui + 3]) << 24);
    
    let uuword = u32::from(data[ui + 4])
      | (u32::from(data[ui + 5]) << 8)
      | (u32::from(data[ui + 6]) << 16)
      | (u32::from(data[ui + 7]) << 24);

    let mixed0 = (((u64::from(llword) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
    let mixed1 = (((u64::from(luword) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
    let mixed2 = (((u64::from(ulword) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
    let mixed3 = (((u64::from(uuword) * self.specialization.get_k_hash_mul()) & self.specialization.get_hash_mask()) >> shift) as usize;
    let mut num_ref0 = u32::from(num[mixed0]);
    num[mixed0] = num_ref0.wrapping_add(1) as u16;
    num_ref0 &= (*self).specialization.block_mask();
    let mut num_ref1 = u32::from(num[mixed1]);
    num[mixed1] = num_ref1.wrapping_add(1) as u16;
    num_ref1 &= (*self).specialization.block_mask();
    let mut num_ref2 = u32::from(num[mixed2]);
    num[mixed2] = num_ref2.wrapping_add(1) as u16;
    num_ref2 &= (*self).specialization.block_mask();
    let mut num_ref3 = u32::from(num[mixed3]);
    num[mixed3] = num_ref3.wrapping_add(1) as u16;
    num_ref3 &= (*self).specialization.block_mask();
    let offset0: usize = (mixed0 << self.specialization.block_bits()) + num_ref0 as usize;
    let offset1: usize = (mixed1 << self.specialization.block_bits()) + num_ref1 as usize;
    let offset2: usize = (mixed2 << self.specialization.block_bits()) + num_ref2 as usize;
    let offset3: usize = (mixed3 << self.specialization.block_bits()) + num_ref3 as usize;
    buckets[offset0] = ix as u32;
    buckets[offset1] = (ix + 4) as u32;
    buckets[offset2] = (ix + 8) as u32;
    buckets[offset3] = (ix + 12) as u32;
  }
  fn Store(&mut self, data: &[u8], mask: usize, ix: usize) {
    let (_, data_window) = data.split_at((ix & mask) as (usize));
    let key: u32 = self.HashBytes(data_window) as u32;
    let minor_ix: usize = (self.num.slice()[(key as (usize))] as (u32) & (*self).specialization.block_mask() as u32) as (usize);
    let offset: usize = minor_ix.wrapping_add((key << (*self).specialization.block_bits()) as
                                              (usize));
    self.buckets.slice_mut()[offset] = ix as (u32);
    {
      let _lhs = &mut self.num.slice_mut()[(key as (usize))];
      *_lhs = (*_lhs as (i32) + 1) as (u16);
    }
  }
    fn StoreRange(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) {
      for i in self.StoreRangeOptBatch(data, mask, ix_start, ix_end)..ix_end {
        self.Store(data, mask, i);
      }
    }
    fn BulkStoreRange(&mut self, data: &[u8], mask: usize, mut ix_start: usize, ix_end: usize) {
      /*
      if ix_start + 4096 < ix_end {
        for vec_offset in 0..(ix_end - ix_start - 4096) / 16 {
          self.Store4Vec4(data, mask, ix_start + vec_offset * 16);
        }
        ix_start += 16 * ((ix_end - ix_start - 4096) / 16);
      }
      if ix_start + 512 < ix_end {
        for vec_offset in 0..(ix_end - ix_start - 512) / 8 {
          self.StoreEvenVec4(data, mask, ix_start + vec_offset * 8);
          //self.StoreRange(data, mask, ix_start + vec_offset * 8, ix_start + (1+ vec_offset) * 8);
        }
        ix_start += 8 * ((ix_end - ix_start - 512) / 8);
      }
       */
      ix_start = self.BulkStoreRangeOptMemFetch(data, mask, ix_start, ix_end);
      for i in ix_start..ix_end {
        self.Store(data, mask, i);
      }
    }

  fn FindLongestMatch(&mut self,
                      dictionary: Option<&BrotliDictionary>,
                      dictionary_hash: &[u16],
                      data: &[u8],
                      ring_buffer_mask: usize,
                      distance_cache: &[i32],
                      cur_ix: usize,
                      max_length: usize,
                      max_backward: usize,
                      gap: usize,
                      max_distance: usize,
                      out: &mut HasherSearchResult)
                      -> bool {
    let opts = self.Opts();
    let cur_ix_masked: usize = cur_ix & ring_buffer_mask;
    let mut is_match_found: i32 = 0i32;
    let mut best_score: u64 = (*out).score;
    let mut best_len: usize = (*out).len;
    let mut i: usize;
    (*out).len = 0usize;
    (*out).len_x_code = 0usize;
    let cur_data = data.split_at(cur_ix_masked).1;
    let mut prev_best = cur_data[best_len];
    for i in 0..self.GetHasherCommon.params.num_last_distances_to_check as (usize) {
      let backward: usize = distance_cache[(i as (usize))] as (usize);
      let mut prev_ix: usize = cur_ix.wrapping_sub(backward);
      if prev_ix >= cur_ix {
        continue;
      }
      if backward > max_backward {
        continue;
      }
      prev_ix = prev_ix & ring_buffer_mask;
      if (cur_ix_masked.wrapping_add(best_len) > ring_buffer_mask || prev_ix.wrapping_add(best_len) > ring_buffer_mask ||
        prev_best != data[prev_ix.wrapping_add(best_len)]) {
        continue;
      }
      let prev_data = data.split_at(prev_ix).1;
          
      let len: usize = FindMatchLengthWithLimit(&prev_data,
                                                cur_data,
                                                max_length);
      if len >= 3usize || len == 2usize && (i < 2usize) {
        let mut score: u64 = BackwardReferenceScoreUsingLastDistance(len, opts);
        if best_score < score {
          if i != 0usize {
                score = score.wrapping_sub(BackwardReferencePenaltyUsingLastDistance(i));
          }
          if best_score < score {
            best_score = score;
            best_len = len;
            (*out).len = best_len;
            (*out).distance = backward;
            (*out).score = best_score;
            is_match_found = 1i32;
            prev_best = cur_data[best_len];
          }
        }
      }
    }
    {
      let key: u32 = self.HashBytes(cur_data) as u32;
      let common_block_bits = self.specialization.block_bits();
      let num_ref_mut = &mut self.num.slice_mut()[key as usize];
      let num_copy = *num_ref_mut;
      let bucket: &mut [u32] = self.buckets.slice_mut().split_at_mut((key << common_block_bits) as (usize)).1.split_at_mut(
        (*self).specialization.block_size() as usize).0;
      assert!(bucket.len() > (*self).specialization.block_mask() as usize);
      if num_copy != 0 {
        let down: usize = core::cmp::max(i32::from(num_copy) - (*self).specialization.block_size() as i32,
                                         0) as usize;
        i = num_copy as (usize);
        while i > down {
          i -= 1;
          let mut prev_ix = bucket[i & (*self).specialization.block_mask() as usize] as usize;
          let backward = cur_ix.wrapping_sub(prev_ix);
          prev_ix &= ring_buffer_mask;
          if (cur_ix_masked.wrapping_add(best_len) > ring_buffer_mask || prev_ix.wrapping_add(best_len) > ring_buffer_mask ||
              cur_data[best_len] != data[prev_ix.wrapping_add(best_len)]) {
            if backward > max_backward {
              break;
            }
            continue;
          }
          if backward > max_backward {
            break;
          }
          let prev_data = data.split_at(prev_ix as usize).1;
          let len = FindMatchLengthWithLimitMin4(&prev_data,
                                                 &cur_data,
                                                 max_length);
          if len != 0 {
            let score: u64 = BackwardReferenceScore(len, backward, opts);
            if best_score < score {
              best_score = score;
              best_len = len;
              (*out).len = best_len;
              (*out).distance = backward;
              (*out).score = best_score;
              is_match_found = 1i32;
            }
          }
        }
      }
      bucket[((num_copy as (u32) & (self).specialization.block_mask() as u32) as (usize))] = cur_ix as (u32);
      *num_ref_mut = num_ref_mut.wrapping_add(1);
    }
    if is_match_found == 0 && dictionary.is_some() {
      let (_, cur_data) = data.split_at(cur_ix_masked as usize);
      is_match_found = SearchInStaticDictionary(dictionary.unwrap(),
                                                dictionary_hash,
                                                self,
                                                cur_data,
                                                max_length,
                                                max_backward.wrapping_add(gap),
                                                max_distance,
                                                out,
                                                0i32);
    }
    is_match_found != 0

  }
}


pub struct BankH40 {
  pub slots: [SlotH40; 65536],
}

pub struct BankH41 {
  pub slots: [SlotH41; 65536],
}

pub struct BankH42 {
  pub slots: [SlotH42; 512],
}


pub struct SlotH40 {
  pub delta: u16,
  pub next: u16,
}
pub struct SlotH41 {
  pub delta: u16,
  pub next: u16,
}

pub struct SlotH42 {
  pub delta: u16,
  pub next: u16,
}

// UNSUPPORTED, for now.
pub struct H40 {
  pub common: Struct1,
  pub addr: [u32; 32768],
  pub head: [u16; 32768],
  pub tiny_hash: [u8; 65536],
  pub banks: [BankH40; 1],
  pub free_slot_idx: [u16; 1],
  pub max_hops: usize,
}


pub struct H41 {
  pub common: Struct1,
  pub addr: [u32; 32768],
  pub head: [u16; 32768],
  pub tiny_hash: [u8; 65536],
  pub banks: [BankH41; 1],
  pub free_slot_idx: [u16; 1],
  pub max_hops: usize,
}

pub struct H42 {
  pub common: Struct1,
  pub addr: [u32; 32768],
  pub head: [u16; 32768],
  pub tiny_hash: [u8; 65536],
  pub banks: [BankH42; 512],
  free_slot_idx: [u16; 512],
  pub max_hops: usize,
}




fn unopt_ctzll(mut val: usize) -> u8 {
  let mut cnt: u8 = 0i32 as (u8);
  while val & 1usize == 0usize {
    val = val >> 1i32;
    cnt = (cnt as (i32) + 1) as (u8);
  }
  cnt
}


fn BackwardReferenceScoreUsingLastDistance(copy_length: usize, h9_opts: H9Opts) -> u64 {
  ((h9_opts.literal_byte_score as u64) >> 2)
    .wrapping_mul(copy_length as u64)
    .wrapping_add((30u64 * 8u64).wrapping_mul(::core::mem::size_of::<u64>() as u64))
    .wrapping_add(15u64)
}


fn BackwardReferenceScore(copy_length: usize, backward_reference_offset: usize, h9_opts: H9Opts) -> u64 {
  (30u64 * 8u64)
    .wrapping_mul(::core::mem::size_of::<u64>() as u64)
    .wrapping_add(((h9_opts.literal_byte_score as usize) >> 2).wrapping_mul(copy_length) as u64)
    .wrapping_sub((30u64).wrapping_mul(Log2FloorNonZero(backward_reference_offset as u64) as u64))
}

fn Hash14(data: &[u8]) -> u32 {
  let h: u32 = BROTLI_UNALIGNED_LOAD32(data).wrapping_mul(kHashMul32);
  h >> 32i32 - 14i32
}

fn TestStaticDictionaryItem(dictionary: &BrotliDictionary,
                            item: usize,
                            data: &[u8],
                            max_length: usize,
                            max_backward: usize,
                            max_distance: usize,
                            h9_opts: H9Opts,
                            out: &mut HasherSearchResult)
                            -> i32 {
  let len: usize;
  let dist: usize;
  let offset: usize;
  let matchlen: usize;
  let backward: usize;
  let score: u64;
  len = item & 0x1fusize;
  dist = item >> 5i32;
  offset = ((*dictionary).offsets_by_length[len] as (usize)).wrapping_add(len.wrapping_mul(dist));
  if len > max_length {
    return 0i32;
  }
  matchlen = FindMatchLengthWithLimit(data, &(*dictionary).data[offset..], len);
  if matchlen.wrapping_add(kCutoffTransformsCount as usize) <= len || matchlen == 0usize {
    return 0i32;
  }
  {
    let cut: u64 = len.wrapping_sub(matchlen) as u64;
    let transform_id: usize =
      (cut << 2i32).wrapping_add(kCutoffTransforms as u64 >> cut.wrapping_mul(6) & 0x3f) as usize;
    backward = max_backward.wrapping_add(dist)
      .wrapping_add(1usize)
      .wrapping_add(transform_id << (*dictionary).size_bits_by_length[len] as (i32));
  }
  if backward > max_distance {
      return 0i32;
  }
  score = BackwardReferenceScore(matchlen, backward, h9_opts);
  if score < (*out).score {
    return 0i32;
  }
  (*out).len = matchlen;
  (*out).len_x_code = len ^ matchlen;
  (*out).distance = backward;
  (*out).score = score;
  1i32
}

fn SearchInStaticDictionary<HasherType: AnyHasher>(dictionary: &BrotliDictionary,
                                                   dictionary_hash: &[u16],
                                                   handle: &mut HasherType,
                                                   data: &[u8],
                                                   max_length: usize,
                                                   max_backward: usize,
                                                   max_distance: usize,
                                                   out: &mut HasherSearchResult,
                                                   shallow: i32)
                                                   -> i32 {
  let mut key: usize;
  let mut i: usize;
  let mut is_match_found: i32 = 0i32;
  let opts = handle.Opts();
  let xself: &mut Struct1 = handle.GetHasherCommon();
  if (*xself).dict_num_matches < (*xself).dict_num_lookups >> 7i32 {
    return 0i32;
  }
  key = (Hash14(data) << 1i32) as (usize); //FIXME: works for any kind of hasher??
  i = 0usize;
  while i < if shallow != 0 { 1u32 } else { 2u32 } as (usize) {
    {
      let item: usize = dictionary_hash[(key as (usize))] as (usize);
      (*xself).dict_num_lookups = (*xself).dict_num_lookups.wrapping_add(1 as (usize));
      if item != 0usize {
        let item_matches: i32 =
          TestStaticDictionaryItem(dictionary, item, data, max_length, max_backward, max_distance, opts, out);
        if item_matches != 0 {
          (*xself).dict_num_matches = (*xself).dict_num_matches.wrapping_add(1 as (usize));
          is_match_found = 1i32;
        }
      }
    }
    i = i.wrapping_add(1 as (usize));
    key = key.wrapping_add(1 as (usize));
  }
  is_match_found
}

impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> CloneWithAlloc<Alloc> for BasicHasher<H2Sub<Alloc>> {
  fn clone_with_alloc(&self, m: &mut Alloc) -> Self {
      let mut ret = BasicHasher::<H2Sub<Alloc>> {
          GetHasherCommon: self.GetHasherCommon.clone(),
          buckets_: H2Sub::<Alloc>{
              buckets_:<Alloc as Allocator<u32>>::alloc_cell(m, self.buckets_.buckets_.len()),
          },
          h9_opts: self.h9_opts.clone(),
      };
      ret.buckets_.buckets_.slice_mut().clone_from_slice(self.buckets_.buckets_.slice());
      ret
  }    
}
impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> CloneWithAlloc<Alloc> for BasicHasher<H3Sub<Alloc>> {
  fn clone_with_alloc(&self, m: &mut Alloc) -> Self {
      let mut ret = BasicHasher::<H3Sub<Alloc>> {
          GetHasherCommon: self.GetHasherCommon.clone(),
          buckets_: H3Sub::<Alloc>{
              buckets_:<Alloc as Allocator<u32>>::alloc_cell(m, self.buckets_.buckets_.len()),
          },
          h9_opts: self.h9_opts.clone(),
      };
      ret.buckets_.buckets_.slice_mut().clone_from_slice(self.buckets_.buckets_.slice());
      ret
  }    
}
impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> CloneWithAlloc<Alloc> for BasicHasher<H4Sub<Alloc>> {
  fn clone_with_alloc(&self, m: &mut Alloc) -> Self {
      let mut ret = BasicHasher::<H4Sub<Alloc>> {
          GetHasherCommon: self.GetHasherCommon.clone(),
          buckets_: H4Sub::<Alloc>{
              buckets_:<Alloc as Allocator<u32>>::alloc_cell(m, self.buckets_.buckets_.len()),
          },
          h9_opts: self.h9_opts.clone(),
      };
      ret.buckets_.buckets_.slice_mut().clone_from_slice(self.buckets_.buckets_.slice());
      ret
  }        
}
impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> CloneWithAlloc<Alloc> for BasicHasher<H54Sub<Alloc>> {
  fn clone_with_alloc(&self, m: &mut Alloc) -> Self {
      let mut ret = BasicHasher::<H54Sub<Alloc>> {
          GetHasherCommon: self.GetHasherCommon.clone(),
          buckets_: H54Sub::<Alloc>{
              buckets_:<Alloc as Allocator<u32>>::alloc_cell(m, self.buckets_.len()),
          },
          h9_opts: self.h9_opts.clone(),
      };
      ret.buckets_.buckets_.slice_mut().clone_from_slice(self.buckets_.buckets_.slice());
      ret
  }    
}
impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>,
     Special: AdvHashSpecialization+Sized+Clone,> CloneWithAlloc<Alloc> for AdvHasher<Special, Alloc> {
  fn clone_with_alloc(&self, m: &mut Alloc) -> Self {
    let mut num = <Alloc as Allocator<u16>>::alloc_cell(m, self.num.len());
    num.slice_mut().clone_from_slice(self.num.slice());
    let mut buckets = <Alloc as Allocator<u32>>::alloc_cell(m, self.buckets.len());
    buckets.slice_mut().clone_from_slice(self.buckets.slice());
    AdvHasher::<Special, Alloc> {
      GetHasherCommon: self.GetHasherCommon.clone(),
      specialization:self.specialization.clone(),
      num:num,
      buckets:buckets,
      h9_opts: self.h9_opts.clone(),
    }
  }
}

pub enum UnionHasher<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> {
  Uninit,
  H2(BasicHasher<H2Sub<Alloc>>),
  H3(BasicHasher<H3Sub<Alloc>>),
  H4(BasicHasher<H4Sub<Alloc>>),
  H54(BasicHasher<H54Sub<Alloc>>),
  H5(AdvHasher<H5Sub, Alloc>),
  H5q7(AdvHasher<HQ7Sub, Alloc>),
  H5q5(AdvHasher<HQ5Sub, Alloc>),
  H6(AdvHasher<H6Sub, Alloc>),
  H9(AdvHasher<H9Sub, Alloc>),
  H10(H10<Alloc, H10Buckets<Alloc>, H10DefaultParams>),
}
impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> PartialEq<UnionHasher<Alloc>> for UnionHasher<Alloc> {
    fn eq(&self, other: &UnionHasher<Alloc>) -> bool {
        match *self {
            UnionHasher::H2(ref hasher) => match *other {
                UnionHasher::H2(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::H3(ref hasher) => match *other {
                UnionHasher::H3(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::H4(ref hasher) => match *other {
                UnionHasher::H4(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::H54(ref hasher) => match *other {
                UnionHasher::H54(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::H5(ref hasher) => match *other {
                UnionHasher::H5(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::H5q7(ref hasher) => match *other {
                UnionHasher::H5q7(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::H5q5(ref hasher) => match *other {
                UnionHasher::H5q5(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::H6(ref hasher) => match *other {
                UnionHasher::H6(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::H9(ref hasher) => match *other {
                UnionHasher::H9(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::H10(ref hasher) => match *other {
                UnionHasher::H10(ref otherh) => *hasher == *otherh,
                _ => false,
            },
            UnionHasher::Uninit => match *other {
                UnionHasher::Uninit => true,
                _ => false,
            },
        }        
    }
}
impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> CloneWithAlloc<Alloc> for UnionHasher<Alloc> {
    fn clone_with_alloc(&self, m: &mut Alloc) -> Self {
        match *self {
            UnionHasher::H2(ref hasher) => UnionHasher::H2(hasher.clone_with_alloc(m)),
            UnionHasher::H3(ref hasher) => UnionHasher::H3(hasher.clone_with_alloc(m)),
            UnionHasher::H4(ref hasher) => UnionHasher::H4(hasher.clone_with_alloc(m)),
            UnionHasher::H5(ref hasher) => UnionHasher::H5(hasher.clone_with_alloc(m)),
            UnionHasher::H5q7(ref hasher) => UnionHasher::H5q7(hasher.clone_with_alloc(m)),
            UnionHasher::H5q5(ref hasher) => UnionHasher::H5q5(hasher.clone_with_alloc(m)),
            UnionHasher::H6(ref hasher) => UnionHasher::H6(hasher.clone_with_alloc(m)),
            UnionHasher::H54(ref hasher) => UnionHasher::H54(hasher.clone_with_alloc(m)),
            UnionHasher::H9(ref hasher) => UnionHasher::H9(hasher.clone_with_alloc(m)),
            UnionHasher::H10(ref hasher) => UnionHasher::H10(hasher.clone_with_alloc(m)),
            UnionHasher::Uninit => UnionHasher::Uninit,
        }
    }
}
macro_rules! match_all_hashers_mut {
    ($xself : expr, $func_call : ident, $( $args:expr),*) => {
        match $xself {
     &mut UnionHasher::H2(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::H3(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::H4(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::H5(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::H5q7(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::H5q5(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::H6(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::H54(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::H9(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::H10(ref mut hasher) => hasher.$func_call($($args),*),
     &mut UnionHasher::Uninit => panic!("UNINTIALIZED"),
        }
    };
}
macro_rules! match_all_hashers {
    ($xself : expr, $func_call : ident, $( $args:expr),*) => {
        match $xself {
     &UnionHasher::H2(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::H3(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::H4(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::H5(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::H5q7(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::H5q5(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::H6(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::H54(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::H9(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::H10(ref hasher) => hasher.$func_call($($args),*),
     &UnionHasher::Uninit => panic!("UNINTIALIZED"),
        }
    };
}
impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> AnyHasher
  for UnionHasher<Alloc> {
  fn Opts(&self) -> H9Opts {
    return match_all_hashers!(self, Opts,);
  }
  fn GetHasherCommon(&mut self) -> &mut Struct1 {
    return match_all_hashers_mut!(self, GetHasherCommon,);
  }/*
  fn GetH10Tree(&mut self) -> Option<&mut H10<AllocU32, H10Buckets, H10DefaultParams>> {
    return match_all_hashers_mut!(self, GetH10Tree,);
  }*/
  fn Prepare(&mut self, one_shot: bool, input_size: usize, data: &[u8]) -> HowPrepared {
    return match_all_hashers_mut!(self, Prepare, one_shot, input_size, data);
  }
  fn HashBytes(&self, data: &[u8]) -> usize {
    return match_all_hashers!(self, HashBytes, data);
  }
  fn HashTypeLength(&self) -> usize {
    return match_all_hashers!(self, HashTypeLength,);
  }
  fn StoreLookahead(&self) -> usize {
    return match_all_hashers!(self, StoreLookahead,);
  }
  fn PrepareDistanceCache(&self, distance_cache: &mut [i32]) {
    return match_all_hashers!(self, PrepareDistanceCache, distance_cache);
  }
  fn StitchToPreviousBlock(&mut self,
                           num_bytes: usize,
                           position: usize,
                           ringbuffer: &[u8],
                           ringbuffer_mask: usize) {
    return match_all_hashers_mut!(self,
                                  StitchToPreviousBlock,
                                  num_bytes,
                                  position,
                                  ringbuffer,
                                  ringbuffer_mask);
  }
  fn FindLongestMatch(&mut self,
                      dictionary: Option<&BrotliDictionary>,
                      dictionary_hash: &[u16],
                      data: &[u8],
                      ring_buffer_mask: usize,
                      distance_cache: &[i32],
                      cur_ix: usize,
                      max_length: usize,
                      max_backward: usize,
                      gap: usize,
                      max_distance: usize,
                      out: &mut HasherSearchResult)
                      -> bool {
    return match_all_hashers_mut!(self,
                                  FindLongestMatch,
                                  dictionary,
                                  dictionary_hash,
                                  data,
                                  ring_buffer_mask,
                                  distance_cache,
                                  cur_ix,
                                  max_length,
                                  max_backward,
                                  gap,
                                  max_distance,
                                  out);
  }
  fn Store(&mut self, data: &[u8], mask: usize, ix: usize) {
    return match_all_hashers_mut!(self, Store, data, mask, ix);
  }
  fn StoreRange(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) {
    return match_all_hashers_mut!(self, StoreRange, data, mask, ix_start, ix_end);
  }
  fn BulkStoreRange(&mut self, data: &[u8], mask: usize, ix_start: usize, ix_end: usize) {
    return match_all_hashers_mut!(self, BulkStoreRange, data, mask, ix_start, ix_end);
  }
}

impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> UnionHasher<Alloc> {
  pub fn free (&mut self, alloc: &mut Alloc) {
    match self {
      &mut UnionHasher::H2(ref mut hasher) => {
        <Alloc as Allocator<u32>>::free_cell(alloc, core::mem::replace(&mut hasher.buckets_.buckets_, <Alloc as Allocator<u32>>::AllocatedMemory::default()));
      }
      &mut UnionHasher::H3(ref mut hasher) => {
        <Alloc as Allocator<u32>>::free_cell(alloc, core::mem::replace(&mut hasher.buckets_.buckets_, <Alloc as Allocator<u32>>::AllocatedMemory::default()));
      }
      &mut UnionHasher::H4(ref mut hasher) => {
        <Alloc as Allocator<u32>>::free_cell(alloc, core::mem::replace(&mut hasher.buckets_.buckets_, <Alloc as Allocator<u32>>::AllocatedMemory::default()));
      }
      &mut UnionHasher::H54(ref mut hasher) => {
        <Alloc as Allocator<u32>>::free_cell(alloc, core::mem::replace(&mut hasher.buckets_.buckets_, <Alloc as Allocator<u32>>::AllocatedMemory::default()));
      }
      &mut UnionHasher::H5q7(ref mut hasher) => {
        <Alloc as Allocator<u16>>::free_cell(alloc, core::mem::replace(&mut hasher.num, <Alloc as Allocator<u16>>::AllocatedMemory::default()));
        <Alloc as Allocator<u32>>::free_cell(alloc, core::mem::replace(&mut hasher.buckets, <Alloc as Allocator<u32>>::AllocatedMemory::default()));
      }
      &mut UnionHasher::H5q5(ref mut hasher) => {
        <Alloc as Allocator<u16>>::free_cell(alloc, core::mem::replace(&mut hasher.num, <Alloc as Allocator<u16>>::AllocatedMemory::default()));
        <Alloc as Allocator<u32>>::free_cell(alloc, core::mem::replace(&mut hasher.buckets, <Alloc as Allocator<u32>>::AllocatedMemory::default()));
      }
      &mut UnionHasher::H5(ref mut hasher) => {
        <Alloc as Allocator<u16>>::free_cell(alloc, core::mem::replace(&mut hasher.num, <Alloc as Allocator<u16>>::AllocatedMemory::default()));
        <Alloc as Allocator<u32>>::free_cell(alloc, core::mem::replace(&mut hasher.buckets, <Alloc as Allocator<u32>>::AllocatedMemory::default()));
      }
      &mut UnionHasher::H6(ref mut hasher) => {
        <Alloc as Allocator<u16>>::free_cell(alloc, core::mem::replace(&mut hasher.num, <Alloc as Allocator<u16>>::AllocatedMemory::default()));
        <Alloc as Allocator<u32>>::free_cell(alloc, core::mem::replace(&mut hasher.buckets, <Alloc as Allocator<u32>>::AllocatedMemory::default()));
      }
      &mut UnionHasher::H9(ref mut hasher) => {
        <Alloc as Allocator<u16>>::free_cell(alloc,core::mem::replace(&mut hasher.num, <Alloc as Allocator<u16>>::AllocatedMemory::default()));
        <Alloc as Allocator<u32>>::free_cell(alloc, core::mem::replace(&mut hasher.buckets, <Alloc as Allocator<u32>>::AllocatedMemory::default()));
      }
      &mut UnionHasher::H10(ref mut hasher) => {
        hasher.free(alloc);
      }
      &mut UnionHasher::Uninit => {}
    }
    *self = UnionHasher::<Alloc>::default();
  }
}


impl<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32>> Default
  for UnionHasher<Alloc> {
  fn default() -> Self {
    UnionHasher::Uninit
  }
}

/*UnionHasher::H2(BasicHasher {
          GetHasherCommon:Struct1{params:BrotliHasherParams{
           type_:2,
           block_bits: 8,
           bucket_bits:16,
           hash_len: 4,
           num_last_distances_to_check:0},
          is_prepared_:0,
          dict_num_lookups:0,
          dict_num_matches:0,
          },
          buckets_:H2Sub{
          buckets_:[0;65537],
          },
          })
          */
fn CreateBackwardReferences<AH: AnyHasher>(dictionary: Option<&BrotliDictionary>,
                                           dictionary_hash: &[u16],
                                           num_bytes: usize,
                                           mut position: usize,
                                           ringbuffer: &[u8],
                                           ringbuffer_mask: usize,
                                           params: &BrotliEncoderParams,
                                           hasher: &mut AH,
                                           dist_cache: &mut [i32],
                                           last_insert_len: &mut usize,
                                           mut commands: &mut [Command],
                                           num_commands: &mut usize,
                                           num_literals: &mut usize) {
  let gap = 0usize;
  let max_backward_limit: usize = (1usize << (*params).lgwin).wrapping_sub(16usize);
  let mut new_commands_count: usize = 0;
  let mut insert_length: usize = *last_insert_len;
  let pos_end: usize = position.wrapping_add(num_bytes);
  let store_end: usize = if num_bytes >= hasher.StoreLookahead() {
    position.wrapping_add(num_bytes).wrapping_sub(hasher.StoreLookahead()).wrapping_add(1usize)
  } else {
    position
  };
  let random_heuristics_window_size: usize = LiteralSpreeLengthForSparseSearch(params);
  let mut apply_random_heuristics: usize = position.wrapping_add(random_heuristics_window_size);
  let kMinScore: u64 = (30u64 * 8)
    .wrapping_mul(::core::mem::size_of::<u64>() as u64)
    .wrapping_add(100u64);
  hasher.PrepareDistanceCache(dist_cache);
  while position.wrapping_add(hasher.HashTypeLength()) < pos_end {
    let mut max_length: usize = pos_end.wrapping_sub(position);
    let mut max_distance: usize = brotli_min_size_t(position, max_backward_limit);
    let mut sr = HasherSearchResult {
      len: 0,
      len_x_code: 0,
      distance: 0,
      score: 0,
    };
    sr.len = 0usize;
    sr.len_x_code = 0usize;
    sr.distance = 0usize;
    sr.score = kMinScore;
    if hasher.FindLongestMatch(dictionary,
                               dictionary_hash,
                               ringbuffer,
                               ringbuffer_mask,
                               dist_cache,
                               position,
                               max_length,
                               max_distance,
                               gap,
                               params.dist.max_distance,
                               &mut sr) {
      let mut delayed_backward_references_in_row: i32 = 0i32;
      max_length = max_length.wrapping_sub(1 as (usize));
      'break6: loop {
        'continue7: loop {
          let cost_diff_lazy: u64 = 175;
          let is_match_found: bool;
          let mut sr2 = HasherSearchResult {
            len: 0,
            len_x_code: 0,
            distance: 0,
            score: 0,
          };
          sr2.len = if (*params).quality < 5 {
            brotli_min_size_t(sr.len.wrapping_sub(1usize), max_length)
          } else {
            0usize
          };
          sr2.len_x_code = 0usize;
          sr2.distance = 0usize;
          sr2.score = kMinScore;
          max_distance = brotli_min_size_t(position.wrapping_add(1usize), max_backward_limit);
          is_match_found = hasher.FindLongestMatch(dictionary,
                                                   dictionary_hash,
                                                   ringbuffer,
                                                   ringbuffer_mask,
                                                   dist_cache,
                                                   position.wrapping_add(1usize),
                                                   max_length,
                                                   max_distance,
                                                   gap,
                                                   params.dist.max_distance,
                                                   &mut sr2);
          if is_match_found && (sr2.score >= sr.score.wrapping_add(cost_diff_lazy)) {
            position = position.wrapping_add(1 as (usize));
            insert_length = insert_length.wrapping_add(1 as (usize));
            sr = sr2;
            if {
                 delayed_backward_references_in_row = delayed_backward_references_in_row + 1;
                 delayed_backward_references_in_row
               } < 4i32 &&
               (position.wrapping_add(hasher.HashTypeLength()) < pos_end) {
              {
                break 'continue7;
              }
            }
          }
          break 'break6;
        }
        max_length = max_length.wrapping_sub(1 as (usize));
      }
      apply_random_heuristics = position.wrapping_add((2usize).wrapping_mul(sr.len))
        .wrapping_add(random_heuristics_window_size);
      max_distance = brotli_min_size_t(position, max_backward_limit);
      {
        let distance_code: usize = ComputeDistanceCode(sr.distance, max_distance, dist_cache);
        if sr.distance <= max_distance && (distance_code > 0usize) {
          dist_cache[(3usize)] = dist_cache[(2usize)];
          dist_cache[(2usize)] = dist_cache[(1usize)];
          dist_cache[(1usize)] = dist_cache[(0usize)];
          dist_cache[(0usize)] = sr.distance as (i32);
          hasher.PrepareDistanceCache(dist_cache);
        }
        new_commands_count += 1;
        InitCommand({
                      let (mut _old, new_commands) = core::mem::replace(&mut commands, &mut []).split_at_mut(1);
                      commands = new_commands;
                      &mut _old[0]
                    },
                    &params.dist,
                    insert_length,
                    sr.len,
                    sr.len ^ sr.len_x_code,
                    distance_code);
      }
      *num_literals = (*num_literals).wrapping_add(insert_length);
      insert_length = 0usize;
      hasher.StoreRange(ringbuffer,
                        ringbuffer_mask,
                        position.wrapping_add(2usize),
                        brotli_min_size_t(position.wrapping_add(sr.len), store_end));
      position = position.wrapping_add(sr.len);
    } else {
      insert_length = insert_length.wrapping_add(1 as (usize));
      position = position.wrapping_add(1 as (usize));

      if position > apply_random_heuristics {
        let kMargin: usize = brotli_max_size_t(hasher.StoreLookahead().wrapping_sub(1usize),
                                               4usize);
        if position.wrapping_add(16usize) >= pos_end.wrapping_sub(kMargin) {
          insert_length = insert_length.wrapping_add(pos_end - position);
          position = pos_end;
        } else if position >
           apply_random_heuristics.wrapping_add((4usize)
                                                  .wrapping_mul(random_heuristics_window_size)) {
          hasher.Store4Vec4(ringbuffer, ringbuffer_mask, position);
          insert_length = insert_length.wrapping_add(16usize);
          position = position.wrapping_add(16usize);
        } else {
          hasher.StoreEvenVec4(ringbuffer, ringbuffer_mask, position);
          insert_length = insert_length.wrapping_add(8usize);
          position = position.wrapping_add(8usize);
        }
      }
    }
  }
  insert_length = insert_length.wrapping_add(pos_end.wrapping_sub(position));
  *last_insert_len = insert_length;
  *num_commands = (*num_commands).wrapping_add(new_commands_count);
}
pub fn BrotliCreateBackwardReferences<Alloc: alloc::Allocator<u16> + alloc::Allocator<u32> + alloc::Allocator<u64> + alloc::Allocator<floatX> + alloc::Allocator<ZopfliNode>>
  (alloc : &mut Alloc,
   dictionary: &BrotliDictionary,
   num_bytes: usize,
   position: usize,
   ringbuffer: &[u8],
   ringbuffer_mask: usize,
   params: &BrotliEncoderParams,
   hasher_union: &mut UnionHasher<Alloc>,
   dist_cache: &mut [i32],
   last_insert_len: &mut usize,
   commands: &mut [Command],
   num_commands: &mut usize,
   num_literals: &mut usize) {
  match (hasher_union) {
    &mut UnionHasher::Uninit => panic!("working with uninitialized hash map"),
      &mut UnionHasher::H10(ref mut hasher) => {
          if params.quality >= 11 {
              super::backward_references_hq::BrotliCreateHqZopfliBackwardReferences(
                  alloc, if params.use_dictionary {Some(dictionary)} else {None},
                  num_bytes,
                  position,
                  ringbuffer,
                  ringbuffer_mask,
                  params,
                  hasher,
                  dist_cache,
                  last_insert_len,
                  commands,
                  num_commands,
                  num_literals)
          } else {
              super::backward_references_hq::BrotliCreateZopfliBackwardReferences(
                  alloc,
                  if params.use_dictionary {Some(dictionary)} else {None},
                  num_bytes,
                  position,
                  ringbuffer,
                  ringbuffer_mask,
                  params,
                  hasher,
                  dist_cache,
                  last_insert_len,
                  commands,
                  num_commands,
                  num_literals)
          }
    }
    &mut UnionHasher::H2(ref mut hasher) => {
      CreateBackwardReferences(if params.use_dictionary {Some(dictionary)} else {None},
                               &kStaticDictionaryHash[..],
                               num_bytes,
                               position,
                               ringbuffer,
                               ringbuffer_mask,
                               params,
                               hasher,
                               dist_cache,
                               last_insert_len,
                               commands,
                               num_commands,
                               num_literals)
    }
    &mut UnionHasher::H3(ref mut hasher) => {
      CreateBackwardReferences(if params.use_dictionary {Some(dictionary)} else {None},
                               &kStaticDictionaryHash[..],
                               num_bytes,
                               position,
                               ringbuffer,
                               ringbuffer_mask,
                               params,
                               hasher,
                               dist_cache,
                               last_insert_len,
                               commands,
                               num_commands,
                               num_literals)
    }
    &mut UnionHasher::H4(ref mut hasher) => {
      CreateBackwardReferences(if params.use_dictionary {Some(dictionary)} else {None},
                               &kStaticDictionaryHash[..],
                               num_bytes,
                               position,
                               ringbuffer,
                               ringbuffer_mask,
                               params,
                               hasher,
                               dist_cache,
                               last_insert_len,
                               commands,
                               num_commands,
                               num_literals)
    }
    &mut UnionHasher::H5(ref mut hasher) => {
      CreateBackwardReferences(if params.use_dictionary {Some(dictionary)} else {None},
                               &kStaticDictionaryHash[..],
                               num_bytes,
                               position,
                               ringbuffer,
                               ringbuffer_mask,
                               params,
                               hasher,
                               dist_cache,
                               last_insert_len,
                               commands,
                               num_commands,
                               num_literals)
    }
    &mut UnionHasher::H5q7(ref mut hasher) => {
      CreateBackwardReferences(if params.use_dictionary {Some(dictionary)} else {None},
                               &kStaticDictionaryHash[..],
                               num_bytes,
                               position,
                               ringbuffer,
                               ringbuffer_mask,
                               params,
                               hasher,
                               dist_cache,
                               last_insert_len,
                               commands,
                               num_commands,
                               num_literals)
    }
    &mut UnionHasher::H5q5(ref mut hasher) => {
      CreateBackwardReferences(if params.use_dictionary {Some(dictionary)} else {None},
                               &kStaticDictionaryHash[..],
                               num_bytes,
                               position,
                               ringbuffer,
                               ringbuffer_mask,
                               params,
                               hasher,
                               dist_cache,
                               last_insert_len,
                               commands,
                               num_commands,
                               num_literals)
    }
    &mut UnionHasher::H6(ref mut hasher) => {
      CreateBackwardReferences(if params.use_dictionary {Some(dictionary)} else {None},
                               &kStaticDictionaryHash[..],
                               num_bytes,
                               position,
                               ringbuffer,
                               ringbuffer_mask,
                               params,
                               hasher,
                               dist_cache,
                               last_insert_len,
                               commands,
                               num_commands,
                               num_literals)
    }
    &mut UnionHasher::H9(ref mut hasher) => {
      CreateBackwardReferences(if params.use_dictionary {Some(dictionary)} else {None},
                               &kStaticDictionaryHash[..],
                               num_bytes,
                               position,
                               ringbuffer,
                               ringbuffer_mask,
                               params,
                               hasher,
                               dist_cache,
                               last_insert_len,
                               commands,
                               num_commands,
                               num_literals)
    }
    &mut UnionHasher::H54(ref mut hasher) => {
      CreateBackwardReferences(if params.use_dictionary {Some(dictionary)} else {None},
                               &kStaticDictionaryHash[..],
                               num_bytes,
                               position,
                               ringbuffer,
                               ringbuffer_mask,
                               params,
                               hasher,
                               dist_cache,
                               last_insert_len,
                               commands,
                               num_commands,
                               num_literals)
    }
  }
}