71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
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// Copyright (c) 2020 MinIO Inc. All rights reserved.
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// Use of this source code is governed by a license that can be
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// found in the LICENSE file.
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package md5simd
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import (
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"sort"
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)
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// Helper struct for sorting blocks based on length
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type lane struct {
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len uint
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pos uint
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}
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// Helper struct for generating number of rounds in combination with mask for valid lanes
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type maskRounds struct {
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mask uint64
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rounds uint64
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}
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func generateMaskAndRounds8(input [8][]byte, mr *[8]maskRounds) (rounds int) {
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// Sort on blocks length small to large
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var sorted [8]lane
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for c, inpt := range input {
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sorted[c] = lane{uint(len(inpt)), uint(c)}
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}
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sort.Slice(sorted[:], func(i, j int) bool { return sorted[i].len < sorted[j].len })
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// Create mask array including 'rounds' (of processing blocks of 64 bytes) between masks
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m, round := uint64(0xff), uint64(0)
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for _, s := range sorted {
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if s.len > 0 {
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if uint64(s.len)>>6 > round {
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mr[rounds] = maskRounds{m, (uint64(s.len) >> 6) - round}
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rounds++
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}
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round = uint64(s.len) >> 6
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}
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m = m & ^(1 << uint(s.pos))
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}
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return
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}
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func generateMaskAndRounds16(input [16][]byte, mr *[16]maskRounds) (rounds int) {
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// Sort on blocks length small to large
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var sorted [16]lane
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for c, inpt := range input {
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sorted[c] = lane{uint(len(inpt)), uint(c)}
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}
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sort.Slice(sorted[:], func(i, j int) bool { return sorted[i].len < sorted[j].len })
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// Create mask array including 'rounds' (of processing blocks of 64 bytes) between masks
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m, round := uint64(0xffff), uint64(0)
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for _, s := range sorted {
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if s.len > 0 {
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if uint64(s.len)>>6 > round {
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mr[rounds] = maskRounds{m, (uint64(s.len) >> 6) - round}
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rounds++
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}
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round = uint64(s.len) >> 6
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}
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m = m & ^(1 << uint(s.pos))
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}
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return
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}
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