package brotli

import 

/* Copyright 2016 Google Inc. All Rights Reserved.

   Distributed under MIT license.
   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/

func (*h10) () uint {
	return 4
}

func (*h10) () uint {
	return 128
}

func ( []byte) uint32 {
	var  uint32 = binary.LittleEndian.Uint32() * kHashMul32

	/* The higher bits contain more mixture from the multiplication,
	   so we take our results from there. */
	return  >> (32 - 17)
}

/* A (forgetful) hash table where each hash bucket contains a binary tree of
   sequences whose first 4 bytes share the same hash code.
   Each sequence is 128 long and is identified by its starting
   position in the input data. The binary tree is sorted by the lexicographic
   order of the sequences, and it is also a max-heap with respect to the
   starting positions. */
type h10 struct {
	hasherCommon
	window_mask_ uint
	buckets_     [1 << 17]uint32
	invalid_pos_ uint32
	forest       []uint32
}

func ( *h10) ( *encoderParams) {
	.window_mask_ = (1 << .lgwin) - 1
	.invalid_pos_ = uint32(0 - .window_mask_)
	var  uint = uint(1) << .lgwin
	.forest = make([]uint32, 2*)
}

func ( *h10) ( bool,  uint,  []byte) {
	var  uint32 = .invalid_pos_
	var  uint32
	for  = 0;  < 1<<17; ++ {
		.buckets_[] = 
	}
}

func ( *h10,  uint) uint {
	return 2 * ( & .window_mask_)
}

func ( *h10,  uint) uint {
	return 2*(&.window_mask_) + 1
}

/* Stores the hash of the next 4 bytes and in a single tree-traversal, the
   hash bucket's binary tree is searched for matches and is re-rooted at the
   current position.

   If less than 128 data is available, the hash bucket of the
   current position is searched for matches, but the state of the hash table
   is not changed, since we can not know the final sorting order of the
   current (incomplete) sequence.

   This function must be called with increasing cur_ix positions. */
func ( *h10,  []byte,  uint,  uint,  uint,  uint,  *uint,  []backwardMatch) []backwardMatch {
	var  uint =  & 
	var  uint = brotli_min_size_t(, 128)
	var  bool = ( >= 128)
	var  uint32 = hashBytesH10([:])
	var  []uint32 = .forest
	var  uint = uint(.buckets_[])
	var  uint = leftChildIndexH10(, )
	var  uint = rightChildIndexH10(, )
	var  uint = 0
	var  uint = 0
	var  uint
	/* The forest index of the rightmost node of the left subtree of the new
	   root, updated as we traverse and re-root the tree of the hash bucket. */

	/* The forest index of the leftmost node of the right subtree of the new
	   root, updated as we traverse and re-root the tree of the hash bucket. */

	/* The match length of the rightmost node of the left subtree of the new
	   root, updated as we traverse and re-root the tree of the hash bucket. */

	/* The match length of the leftmost node of the right subtree of the new
	   root, updated as we traverse and re-root the tree of the hash bucket. */
	if  {
		.buckets_[] = uint32()
	}

	for  = 64; ; -- {
		var  uint =  - 
		var  uint =  & 
		if  == 0 ||  >  ||  == 0 {
			if  {
				[] = .invalid_pos_
				[] = .invalid_pos_
			}

			break
		}
		{
			var  uint = brotli_min_size_t(, )
			var  uint
			assert( <= 128)
			 =  + findMatchLengthWithLimit([+:], [+:], -)
			if  != nil &&  > * {
				* = uint()
				initBackwardMatch(&[0], , uint())
				 = [1:]
			}

			if  >=  {
				if  {
					[] = [leftChildIndexH10(, )]
					[] = [rightChildIndexH10(, )]
				}

				break
			}

			if [+] > [+] {
				 = uint()
				if  {
					[] = uint32()
				}

				 = rightChildIndexH10(, )
				 = uint([])
			} else {
				 = uint()
				if  {
					[] = uint32()
				}

				 = leftChildIndexH10(, )
				 = uint([])
			}
		}
	}

	return 
}

/* Finds all backward matches of &data[cur_ix & ring_buffer_mask] up to the
   length of max_length and stores the position cur_ix in the hash table.

   Sets *num_matches to the number of matches found, and stores the found
   matches in matches[0] to matches[*num_matches - 1]. The matches will be
   sorted by strictly increasing length and (non-strictly) increasing
   distance. */
func ( *h10,  *encoderDictionary,  []byte,  uint,  uint,  uint,  uint,  uint,  *encoderParams,  []backwardMatch) uint {
	var  []backwardMatch = 
	var  uint =  & 
	var  uint = 1
	var  uint
	if .quality != hqZopflificationQuality {
		 = 16
	} else {
		 = 64
	}
	var  uint =  - 
	var  [maxStaticDictionaryMatchLen + 1]uint32
	var  uint
	if  <  {
		 = 0
	}
	for  =  - 1;  >  &&  <= 2; -- {
		var  uint = 
		var  uint =  - 
		if  >  {
			break
		}

		 &= 
		if [] != [] || [+1] != [+1] {
			continue
		}
		{
			var  uint = findMatchLengthWithLimit([:], [:], )
			if  >  {
				 = uint()
				initBackwardMatch(&[0], , uint())
				 = [1:]
			}
		}
	}

	if  <  {
		 = storeAndFindMatchesH10(, , , , , , &, )
	}

	for  = 0;  <= maxStaticDictionaryMatchLen; ++ {
		[] = kInvalidMatch
	}
	{
		var  uint = brotli_max_size_t(4, +1)
		if findAllStaticDictionaryMatches(, [:], , , [0:]) {
			var  uint = brotli_min_size_t(maxStaticDictionaryMatchLen, )
			var  uint
			for  = ;  <= ; ++ {
				var  uint32 = []
				if  < kInvalidMatch {
					var  uint =  +  + uint(>>5) + 1
					if  <= .dist.max_distance {
						initDictionaryBackwardMatch(&[0], , , uint(&31))
						 = [1:]
					}
				}
			}
		}
	}

	return uint(-cap() + cap())
}

/* Stores the hash of the next 4 bytes and re-roots the binary tree at the
   current sequence, without returning any matches.
   REQUIRES: ix + 128 <= end-of-current-block */
func ( *h10) ( []byte,  uint,  uint) {
	var  uint = .window_mask_ - windowGap + 1
	/* Maximum distance is window size - 16, see section 9.1. of the spec. */
	storeAndFindMatchesH10(, , , , 128, , nil, nil)
}

func ( *h10) ( []byte,  uint,  uint,  uint) {
	var  uint = 
	var  uint = 
	if +63 <=  {
		 =  - 63
	}

	if +512 <=  {
		for ;  < ;  += 8 {
			.Store(, , )
		}
	}

	for ;  < ; ++ {
		.Store(, , )
	}
}

func ( *h10) ( uint,  uint,  []byte,  uint) {
	if  >= .HashTypeLength()-1 &&  >= 128 {
		var  uint =  - 128 + 1
		var  uint = brotli_min_size_t(, +)
		/* Store the last `128 - 1` positions in the hasher.
		   These could not be calculated before, since they require knowledge
		   of both the previous and the current block. */

		var  uint
		for  = ;  < ; ++ {
			/* Maximum distance is window size - 16, see section 9.1. of the spec.
			   Furthermore, we have to make sure that we don't look further back
			   from the start of the next block than the window size, otherwise we
			   could access already overwritten areas of the ring-buffer. */
			var  uint = .window_mask_ - brotli_max_size_t(windowGap-1, -)

			/* We know that i + 128 <= position + num_bytes, i.e. the
			   end of the current block and that we have at least
			   128 tail in the ring-buffer. */
			storeAndFindMatchesH10(, , , , 128, , nil, nil)
		}
	}
}

/* MAX_NUM_MATCHES == 64 + MAX_TREE_SEARCH_DEPTH */
const maxNumMatchesH10 = 128

func (*h10) ( *encoderDictionary,  []byte,  uint,  []int,  uint,  uint,  uint,  uint,  uint,  *hasherSearchResult) {
	panic("unimplemented")
}

func (*h10) ( []int) {
	panic("unimplemented")
}