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