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