94 lines
2.9 KiB
Go
94 lines
2.9 KiB
Go
package brotli
|
|
|
|
/* Copyright 2018 Google Inc. All Rights Reserved.
|
|
|
|
Distributed under MIT license.
|
|
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
|
|
*/
|
|
|
|
func (h *hashComposite) HashTypeLength() uint {
|
|
var a uint = h.ha.HashTypeLength()
|
|
var b uint = h.hb.HashTypeLength()
|
|
if a > b {
|
|
return a
|
|
} else {
|
|
return b
|
|
}
|
|
}
|
|
|
|
func (h *hashComposite) StoreLookahead() uint {
|
|
var a uint = h.ha.StoreLookahead()
|
|
var b uint = h.hb.StoreLookahead()
|
|
if a > b {
|
|
return a
|
|
} else {
|
|
return b
|
|
}
|
|
}
|
|
|
|
/* Composite hasher: This hasher allows to combine two other hashers, HASHER_A
|
|
and HASHER_B. */
|
|
type hashComposite struct {
|
|
hasherCommon
|
|
ha hasherHandle
|
|
hb hasherHandle
|
|
params *encoderParams
|
|
}
|
|
|
|
func (h *hashComposite) Initialize(params *encoderParams) {
|
|
h.params = params
|
|
}
|
|
|
|
/* TODO: Initialize of the hashers is defered to Prepare (and params
|
|
remembered here) because we don't get the one_shot and input_size params
|
|
here that are needed to know the memory size of them. Instead provide
|
|
those params to all hashers InitializehashComposite */
|
|
func (h *hashComposite) Prepare(one_shot bool, input_size uint, data []byte) {
|
|
if h.ha == nil {
|
|
var common_a *hasherCommon
|
|
var common_b *hasherCommon
|
|
|
|
common_a = h.ha.Common()
|
|
common_a.params = h.params.hasher
|
|
common_a.is_prepared_ = false
|
|
common_a.dict_num_lookups = 0
|
|
common_a.dict_num_matches = 0
|
|
h.ha.Initialize(h.params)
|
|
|
|
common_b = h.hb.Common()
|
|
common_b.params = h.params.hasher
|
|
common_b.is_prepared_ = false
|
|
common_b.dict_num_lookups = 0
|
|
common_b.dict_num_matches = 0
|
|
h.hb.Initialize(h.params)
|
|
}
|
|
|
|
h.ha.Prepare(one_shot, input_size, data)
|
|
h.hb.Prepare(one_shot, input_size, data)
|
|
}
|
|
|
|
func (h *hashComposite) Store(data []byte, mask uint, ix uint) {
|
|
h.ha.Store(data, mask, ix)
|
|
h.hb.Store(data, mask, ix)
|
|
}
|
|
|
|
func (h *hashComposite) StoreRange(data []byte, mask uint, ix_start uint, ix_end uint) {
|
|
h.ha.StoreRange(data, mask, ix_start, ix_end)
|
|
h.hb.StoreRange(data, mask, ix_start, ix_end)
|
|
}
|
|
|
|
func (h *hashComposite) StitchToPreviousBlock(num_bytes uint, position uint, ringbuffer []byte, ring_buffer_mask uint) {
|
|
h.ha.StitchToPreviousBlock(num_bytes, position, ringbuffer, ring_buffer_mask)
|
|
h.hb.StitchToPreviousBlock(num_bytes, position, ringbuffer, ring_buffer_mask)
|
|
}
|
|
|
|
func (h *hashComposite) PrepareDistanceCache(distance_cache []int) {
|
|
h.ha.PrepareDistanceCache(distance_cache)
|
|
h.hb.PrepareDistanceCache(distance_cache)
|
|
}
|
|
|
|
func (h *hashComposite) FindLongestMatch(dictionary *encoderDictionary, data []byte, ring_buffer_mask uint, distance_cache []int, cur_ix uint, max_length uint, max_backward uint, gap uint, max_distance uint, out *hasherSearchResult) {
|
|
h.ha.FindLongestMatch(dictionary, data, ring_buffer_mask, distance_cache, cur_ix, max_length, max_backward, gap, max_distance, out)
|
|
h.hb.FindLongestMatch(dictionary, data, ring_buffer_mask, distance_cache, cur_ix, max_length, max_backward, gap, max_distance, out)
|
|
}
|