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* update github.com/alecthomas/chroma v0.8.0 -> v0.8.1 * github.com/blevesearch/bleve v1.0.10 -> v1.0.12 * editorconfig-core-go v2.1.1 -> v2.3.7 * github.com/gliderlabs/ssh v0.2.2 -> v0.3.1 * migrate editorconfig.ParseBytes to Parse * github.com/shurcooL/vfsgen to 0d455de96546 * github.com/go-git/go-git/v5 v5.1.0 -> v5.2.0 * github.com/google/uuid v1.1.1 -> v1.1.2 * github.com/huandu/xstrings v1.3.0 -> v1.3.2 * github.com/klauspost/compress v1.10.11 -> v1.11.1 * github.com/markbates/goth v1.61.2 -> v1.65.0 * github.com/mattn/go-sqlite3 v1.14.0 -> v1.14.4 * github.com/mholt/archiver v3.3.0 -> v3.3.2 * github.com/microcosm-cc/bluemonday 4f7140c49acb -> v1.0.4 * github.com/minio/minio-go v7.0.4 -> v7.0.5 * github.com/olivere/elastic v7.0.9 -> v7.0.20 * github.com/urfave/cli v1.20.0 -> v1.22.4 * github.com/prometheus/client_golang v1.1.0 -> v1.8.0 * github.com/xanzy/go-gitlab v0.37.0 -> v0.38.1 * mvdan.cc/xurls v2.1.0 -> v2.2.0 Co-authored-by: Lauris BH <lauris@nix.lv>
227 lines
5.4 KiB
Go
Vendored
227 lines
5.4 KiB
Go
Vendored
package brotli
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import "math"
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/* The distance symbols effectively used by "Large Window Brotli" (32-bit). */
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const numHistogramDistanceSymbols = 544
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type histogramLiteral struct {
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data_ [numLiteralSymbols]uint32
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total_count_ uint
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bit_cost_ float64
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}
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func histogramClearLiteral(self *histogramLiteral) {
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self.data_ = [numLiteralSymbols]uint32{}
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self.total_count_ = 0
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self.bit_cost_ = math.MaxFloat64
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}
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func clearHistogramsLiteral(array []histogramLiteral, length uint) {
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var i uint
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for i = 0; i < length; i++ {
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histogramClearLiteral(&array[i:][0])
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}
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}
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func histogramAddLiteral(self *histogramLiteral, val uint) {
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self.data_[val]++
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self.total_count_++
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}
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func histogramAddVectorLiteral(self *histogramLiteral, p []byte, n uint) {
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self.total_count_ += n
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n += 1
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for {
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n--
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if n == 0 {
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break
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}
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self.data_[p[0]]++
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p = p[1:]
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}
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}
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func histogramAddHistogramLiteral(self *histogramLiteral, v *histogramLiteral) {
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var i uint
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self.total_count_ += v.total_count_
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for i = 0; i < numLiteralSymbols; i++ {
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self.data_[i] += v.data_[i]
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}
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}
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func histogramDataSizeLiteral() uint {
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return numLiteralSymbols
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}
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type histogramCommand struct {
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data_ [numCommandSymbols]uint32
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total_count_ uint
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bit_cost_ float64
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}
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func histogramClearCommand(self *histogramCommand) {
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self.data_ = [numCommandSymbols]uint32{}
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self.total_count_ = 0
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self.bit_cost_ = math.MaxFloat64
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}
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func clearHistogramsCommand(array []histogramCommand, length uint) {
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var i uint
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for i = 0; i < length; i++ {
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histogramClearCommand(&array[i:][0])
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}
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}
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func histogramAddCommand(self *histogramCommand, val uint) {
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self.data_[val]++
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self.total_count_++
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}
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func histogramAddVectorCommand(self *histogramCommand, p []uint16, n uint) {
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self.total_count_ += n
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n += 1
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for {
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n--
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if n == 0 {
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break
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}
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self.data_[p[0]]++
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p = p[1:]
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}
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}
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func histogramAddHistogramCommand(self *histogramCommand, v *histogramCommand) {
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var i uint
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self.total_count_ += v.total_count_
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for i = 0; i < numCommandSymbols; i++ {
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self.data_[i] += v.data_[i]
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}
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}
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func histogramDataSizeCommand() uint {
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return numCommandSymbols
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}
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type histogramDistance struct {
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data_ [numDistanceSymbols]uint32
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total_count_ uint
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bit_cost_ float64
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}
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func histogramClearDistance(self *histogramDistance) {
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self.data_ = [numDistanceSymbols]uint32{}
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self.total_count_ = 0
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self.bit_cost_ = math.MaxFloat64
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}
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func clearHistogramsDistance(array []histogramDistance, length uint) {
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var i uint
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for i = 0; i < length; i++ {
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histogramClearDistance(&array[i:][0])
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}
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}
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func histogramAddDistance(self *histogramDistance, val uint) {
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self.data_[val]++
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self.total_count_++
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}
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func histogramAddVectorDistance(self *histogramDistance, p []uint16, n uint) {
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self.total_count_ += n
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n += 1
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for {
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n--
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if n == 0 {
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break
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}
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self.data_[p[0]]++
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p = p[1:]
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}
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}
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func histogramAddHistogramDistance(self *histogramDistance, v *histogramDistance) {
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var i uint
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self.total_count_ += v.total_count_
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for i = 0; i < numDistanceSymbols; i++ {
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self.data_[i] += v.data_[i]
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}
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}
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func histogramDataSizeDistance() uint {
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return numDistanceSymbols
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}
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type blockSplitIterator struct {
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split_ *blockSplit
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idx_ uint
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type_ uint
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length_ uint
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}
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func initBlockSplitIterator(self *blockSplitIterator, split *blockSplit) {
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self.split_ = split
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self.idx_ = 0
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self.type_ = 0
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if len(split.lengths) > 0 {
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self.length_ = uint(split.lengths[0])
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} else {
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self.length_ = 0
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}
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}
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func blockSplitIteratorNext(self *blockSplitIterator) {
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if self.length_ == 0 {
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self.idx_++
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self.type_ = uint(self.split_.types[self.idx_])
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self.length_ = uint(self.split_.lengths[self.idx_])
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}
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self.length_--
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}
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func buildHistogramsWithContext(cmds []command, literal_split *blockSplit, insert_and_copy_split *blockSplit, dist_split *blockSplit, ringbuffer []byte, start_pos uint, mask uint, prev_byte byte, prev_byte2 byte, context_modes []int, literal_histograms []histogramLiteral, insert_and_copy_histograms []histogramCommand, copy_dist_histograms []histogramDistance) {
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var pos uint = start_pos
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var literal_it blockSplitIterator
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var insert_and_copy_it blockSplitIterator
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var dist_it blockSplitIterator
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initBlockSplitIterator(&literal_it, literal_split)
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initBlockSplitIterator(&insert_and_copy_it, insert_and_copy_split)
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initBlockSplitIterator(&dist_it, dist_split)
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for i := range cmds {
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var cmd *command = &cmds[i]
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var j uint
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blockSplitIteratorNext(&insert_and_copy_it)
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histogramAddCommand(&insert_and_copy_histograms[insert_and_copy_it.type_], uint(cmd.cmd_prefix_))
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/* TODO: unwrap iterator blocks. */
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for j = uint(cmd.insert_len_); j != 0; j-- {
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var context uint
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blockSplitIteratorNext(&literal_it)
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context = literal_it.type_
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if context_modes != nil {
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var lut contextLUT = getContextLUT(context_modes[context])
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context = (context << literalContextBits) + uint(getContext(prev_byte, prev_byte2, lut))
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}
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histogramAddLiteral(&literal_histograms[context], uint(ringbuffer[pos&mask]))
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prev_byte2 = prev_byte
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prev_byte = ringbuffer[pos&mask]
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pos++
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}
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pos += uint(commandCopyLen(cmd))
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if commandCopyLen(cmd) != 0 {
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prev_byte2 = ringbuffer[(pos-2)&mask]
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prev_byte = ringbuffer[(pos-1)&mask]
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if cmd.cmd_prefix_ >= 128 {
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var context uint
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blockSplitIteratorNext(&dist_it)
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context = uint(uint32(dist_it.type_<<distanceContextBits) + commandDistanceContext(cmd))
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histogramAddDistance(©_dist_histograms[context], uint(cmd.dist_prefix_)&0x3FF)
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}
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}
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}
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}
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