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lzma_encoder.go
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1150 lines (1037 loc) · 32.1 KB
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// Copyright (c) 2010, Andrei Vieru. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lzma
import (
"fmt"
"io"
"strconv"
"strings"
)
const (
BestSpeed = 1
BestCompression = 9
DefaultCompression = 5
)
// local error wrapper so we can distinguish between error we want
// to return as errors from genuine panics
type osError struct {
error
}
// An argumentValueError reports an error encountered while parsing user provided arguments.
type argumentValueError struct {
msg string
val interface{}
}
func (e *argumentValueError) Error() string {
return fmt.Sprintf("illegal argument value error: %s with value %v", e.msg, e.val)
}
// Report error and stop executing. Wraps error an osError for handlePanics() to
// distinguish them from genuine panics.
func throw(err error) {
panic(&osError{err})
}
// handlePanics is a deferred function to turn a panic with type *osError into a plain error
// return. Other panics are unexpected and so are re-enabled.
func handlePanics(error *error) {
if v := recover(); v != nil {
switch e := v.(type) {
case *osError:
*error = e.error
default:
// runtime errors should crash
panic(v)
}
}
}
type syncPipeReader struct {
*io.PipeReader
closeChan chan bool
}
func (sr *syncPipeReader) CloseWithError(err error) error {
retErr := sr.PipeReader.CloseWithError(err)
sr.closeChan <- true // finish writer close
return retErr
}
type syncPipeWriter struct {
*io.PipeWriter
closeChan chan bool
}
func (sw *syncPipeWriter) Close() error {
err := sw.PipeWriter.Close()
<-sw.closeChan // wait for reader close
return err
}
func syncPipe() (*syncPipeReader, *syncPipeWriter) {
r, w := io.Pipe()
sr := &syncPipeReader{r, make(chan bool, 1)}
sw := &syncPipeWriter{w, sr.closeChan}
return sr, sw
}
type compressionLevel struct {
dictSize uint32 // d, 1 << dictSize
fastBytes uint32 // fb
litContextBits uint32 // lc
litPosStateBits uint32 // lp // not used
posStateBits uint32 // pb
matchFinder string // mf
//compressionMode uint32 // a
//matchCycles uint32 // mc
}
// levels is intended to be constant, but there is no way to enforce this constraint
var levels = []compressionLevel{
compressionLevel{}, // 0
compressionLevel{16, 64, 3, 0, 2, "bt4"}, // 1
compressionLevel{18, 64, 3, 0, 2, "bt4"}, // 2
compressionLevel{20, 64, 3, 0, 2, "bt4"}, // 3
compressionLevel{22, 128, 3, 0, 2, "bt4"}, // 4
compressionLevel{23, 128, 3, 0, 2, "bt4"}, // 5
compressionLevel{24, 128, 3, 0, 2, "bt4"}, // 6
compressionLevel{25, 256, 3, 0, 2, "bt4"}, // 7
compressionLevel{26, 256, 3, 0, 2, "bt4"}, // 8
compressionLevel{27, 256, 3, 0, 2, "bt4"}, // 9
}
func (cl *compressionLevel) checkValues() {
if cl.dictSize < 12 || cl.dictSize > 29 {
throw(&argumentValueError{"dictionary size out of range", cl.dictSize})
}
if cl.fastBytes < 5 || cl.fastBytes > 273 {
throw(&argumentValueError{"number of fast bytes out of range", cl.fastBytes})
}
if cl.litContextBits < 0 || cl.litContextBits > 8 {
throw(&argumentValueError{"number of literal context bits out of range", cl.litContextBits})
}
if cl.litPosStateBits < 0 || cl.litPosStateBits > 4 {
throw(&argumentValueError{"number of literal position bits out of range", cl.litPosStateBits})
}
if cl.posStateBits < 0 || cl.posStateBits > 4 {
throw(&argumentValueError{"number of position bits out of range", cl.posStateBits})
}
if cl.matchFinder != "bt2" && cl.matchFinder != "bt4" {
throw(&argumentValueError{"unsuported match finder", cl.matchFinder})
}
}
var gFastPos []byte = make([]byte, 1<<11)
// should be called in the encoder's contructor
func initGFastPos() {
kFastSlots := 22
c := 2
gFastPos[0] = 0
gFastPos[1] = 1
for slotFast := 2; slotFast < kFastSlots; slotFast++ {
k := 1 << uint(slotFast>>1-1)
for j := 0; j < k; j, c = j+1, c+1 {
gFastPos[c] = byte(slotFast)
}
}
}
func getPosSlot(pos uint32) uint32 {
if pos < 1<<11 {
return uint32(gFastPos[pos])
}
if pos < 1<<21 {
return uint32(gFastPos[pos>>10] + 20)
}
return uint32(gFastPos[pos>>20] + 40)
}
func getPosSlot2(pos uint32) uint32 {
if pos < 1<<17 {
return uint32(gFastPos[pos>>6] + 12)
}
if pos < 1<<27 {
return uint32(gFastPos[pos>>16] + 32)
}
return uint32(gFastPos[pos>>26] + 52)
}
type optimal struct {
state,
posPrev2,
backPrev2,
price,
posPrev,
backPrev,
backs0,
backs1,
backs2,
backs3 uint32
prev1IsChar,
prev2 bool
}
func (o *optimal) makeAsChar() {
o.backPrev = 0xFFFFFFFF
o.prev1IsChar = false
}
func (o *optimal) makeAsShortRep() {
o.backPrev = 0
o.prev1IsChar = false
}
func (o *optimal) isShortRep() bool {
if o.backPrev == 0 {
return true
}
return false
}
const (
eMatchFinderTypeBT2 = 0
eMatchFinderTypeBT4 = 1
kInfinityPrice = 0x0FFFFFFF
kDefaultDicLogSize = 22
kNumFastBytesDefault = 0x20
kNumLenSpecSymbols = kNumLowLenSymbols + kNumMidLenSymbols
kNumOpts = 1 << 12
)
type encoder struct {
// i/o, range encoder and match finder
re *rangeEncoder // w
mf *lzBinTree // r
cl *compressionLevel
size int64
writeEndMark bool // eos
optimum []*optimal
isMatch []uint16
isRep []uint16
isRepG0 []uint16
isRepG1 []uint16
isRepG2 []uint16
isRep0Long []uint16
posSlotCoders []*rangeBitTreeCoder
posCoders []uint16
posAlignCoder *rangeBitTreeCoder
lenCoder *lenPriceTableCoder
repMatchLenCoder *lenPriceTableCoder
litCoder *litCoder
matchDistances []uint32
longestMatchLen uint32
distancePairs uint32
additionalOffset uint32
optimumEndIndex uint32
optimumCurrentIndex uint32
longestMatchFound bool
posSlotPrices []uint32
distancesPrices []uint32
alignPrices []uint32
alignPriceCount uint32
distTableSize uint32
posStateMask uint32
nowPos int64
finished bool
matchFinderType uint32
state uint32
prevByte byte
repDistances []uint32
matchPriceCount uint32
reps []uint32
repLens []uint32
backRes uint32
}
func (z *encoder) readMatchDistances() (lenRes uint32) {
lenRes = 0
z.distancePairs = z.mf.getMatches(z.matchDistances)
if z.distancePairs > 0 {
lenRes = z.matchDistances[z.distancePairs-2]
if lenRes == z.cl.fastBytes {
lenRes += z.mf.iw.getMatchLen(int32(lenRes)-1, z.matchDistances[z.distancePairs-1], kMatchMaxLen-lenRes)
}
}
z.additionalOffset++
return
}
func (z *encoder) movePos(num uint32) {
if num > 0 {
z.additionalOffset += num
z.mf.skip(num)
}
}
func (z *encoder) getPureRepPrice(repIndex, state, posState uint32) (price uint32) {
if repIndex == 0 {
price = getPrice0(z.isRepG0[state])
price += getPrice1(z.isRep0Long[state<<kNumPosStatesBitsMax+posState])
} else {
price = getPrice1(z.isRepG0[state])
if repIndex == 1 {
price += getPrice0(z.isRepG1[state])
} else {
price += getPrice1(z.isRepG1[state])
price += getPrice(z.isRepG2[state], repIndex-2)
}
}
return
}
func (z *encoder) getRepPrice(repIndex, length, state, posState uint32) (price uint32) {
price = z.repMatchLenCoder.getPrice(length-kMatchMinLen, posState)
price += z.getPureRepPrice(repIndex, state, posState)
return
}
func (z *encoder) getPosLenPrice(pos, length, posState uint32) (price uint32) {
lenToPosState := getLenToPosState(length)
if pos < kNumFullDistances {
price = z.distancesPrices[lenToPosState*kNumFullDistances+pos]
} else {
price = z.posSlotPrices[lenToPosState<<kNumPosSlotBits+getPosSlot2(pos)] + z.alignPrices[pos&kAlignMask]
}
price += z.lenCoder.getPrice(length-kMatchMinLen, posState)
return
}
func (z *encoder) getRepLen1Price(state, posState uint32) uint32 {
return getPrice0(z.isRepG0[state]) + getPrice0(z.isRep0Long[state<<kNumPosStatesBitsMax+posState])
}
func (z *encoder) backward(cur uint32) uint32 {
z.optimumEndIndex = cur
posMem := z.optimum[cur].posPrev
backMem := z.optimum[cur].backPrev
tmp := uint32(1) // execute the loop at least once (do-while)
for ; tmp > 0; tmp = cur {
if z.optimum[cur].prev1IsChar == true {
z.optimum[posMem].makeAsChar()
z.optimum[posMem].posPrev = posMem - 1
if z.optimum[cur].prev2 == true {
z.optimum[posMem-1].prev1IsChar = false
z.optimum[posMem-1].posPrev = z.optimum[cur].posPrev2
z.optimum[posMem-1].backPrev = z.optimum[cur].backPrev2
}
}
posPrev := posMem
backCur := backMem
backMem = z.optimum[posPrev].backPrev
posMem = z.optimum[posPrev].posPrev
z.optimum[posPrev].backPrev = backCur
z.optimum[posPrev].posPrev = cur
cur = posPrev
}
z.backRes = z.optimum[0].backPrev
z.optimumCurrentIndex = z.optimum[0].posPrev
return z.optimumCurrentIndex
}
func (z *encoder) getOptimum(position uint32) (res uint32) {
if z.optimumEndIndex != z.optimumCurrentIndex {
lenRes := z.optimum[z.optimumCurrentIndex].posPrev - z.optimumCurrentIndex
z.backRes = z.optimum[z.optimumCurrentIndex].backPrev
z.optimumCurrentIndex = z.optimum[z.optimumCurrentIndex].posPrev
res = lenRes
return
}
z.optimumEndIndex = 0
z.optimumCurrentIndex = 0
var lenMain uint32
var distancePairs uint32
if z.longestMatchFound == false {
lenMain = z.readMatchDistances()
} else {
lenMain = z.longestMatchLen
z.longestMatchFound = false
}
distancePairs = z.distancePairs
availableBytes := z.mf.iw.getNumAvailableBytes() + 1
if availableBytes < 2 {
z.backRes = 0xFFFFFFFF
res = 1
return
}
if availableBytes > kMatchMaxLen {
availableBytes = kMatchMaxLen
}
repMaxIndex := uint32(0)
for i := uint32(0); i < kNumRepDistances; i++ {
z.reps[i] = z.repDistances[i]
z.repLens[i] = z.mf.iw.getMatchLen(0-1, z.reps[i], kMatchMaxLen)
if z.repLens[i] > z.repLens[repMaxIndex] {
repMaxIndex = i
}
}
if z.repLens[repMaxIndex] >= z.cl.fastBytes {
z.backRes = repMaxIndex
lenRes := z.repLens[repMaxIndex]
res = lenRes
z.movePos(lenRes - 1)
return
}
if lenMain >= z.cl.fastBytes {
z.backRes = z.matchDistances[distancePairs-1] + kNumRepDistances
res = lenMain
z.movePos(lenMain - 1)
return
}
curByte := z.mf.iw.getIndexByte(0 - 1)
matchByte := z.mf.iw.getIndexByte(0 - int32(z.repDistances[0]) - 1 - 1)
if lenMain < 2 && curByte != matchByte && z.repLens[repMaxIndex] < 2 {
z.backRes = 0xFFFFFFFF
res = 1
return
}
z.optimum[0].state = z.state
posState := position & z.posStateMask
z.optimum[1].price = getPrice0(z.isMatch[z.state<<kNumPosStatesBitsMax+posState]) +
z.litCoder.getSubCoder(position, z.prevByte).getPrice(!stateIsCharState(z.state), matchByte, curByte)
z.optimum[1].makeAsChar()
matchPrice := getPrice1(z.isMatch[z.state<<kNumPosStatesBitsMax+posState])
repMatchPrice := matchPrice + getPrice1(z.isRep[z.state])
if matchByte == curByte {
shortRepPrice := repMatchPrice + z.getRepLen1Price(z.state, posState)
if shortRepPrice < z.optimum[1].price {
z.optimum[1].price = shortRepPrice
z.optimum[1].makeAsShortRep()
}
}
lenEnd := z.repLens[repMaxIndex]
if lenMain > lenEnd {
lenEnd = lenMain
}
if lenEnd < 2 {
z.backRes = z.optimum[1].backPrev
res = 1
return
}
z.optimum[1].posPrev = 0
z.optimum[0].backs0 = z.reps[0]
z.optimum[0].backs1 = z.reps[1]
z.optimum[0].backs2 = z.reps[2]
z.optimum[0].backs3 = z.reps[3]
length := lenEnd
DoWhile1:
z.optimum[length].price = kInfinityPrice
if length--; length >= 2 {
goto DoWhile1
}
for i := uint32(0); i < kNumRepDistances; i++ {
repLen := z.repLens[i]
if repLen < 2 {
continue
}
price := repMatchPrice + z.getPureRepPrice(i, z.state, posState)
DoWhile2:
curAndLenPrice := price + z.repMatchLenCoder.getPrice(repLen-2, posState)
optimum := z.optimum[repLen]
if curAndLenPrice < optimum.price {
optimum.price = curAndLenPrice
optimum.posPrev = 0
optimum.backPrev = i
optimum.prev1IsChar = false
}
if repLen--; repLen >= 2 {
goto DoWhile2
}
}
normalMatchPrice := matchPrice + getPrice0(z.isRep[z.state])
length = 2
if z.repLens[0] >= 2 {
length = z.repLens[0] + 1
}
if length <= lenMain {
offs := uint32(0)
for length > z.matchDistances[offs] {
offs += 2
}
for ; ; length++ {
distance := z.matchDistances[offs+1]
curAndLenPrice := normalMatchPrice + z.getPosLenPrice(distance, length, posState)
optimum := z.optimum[length]
if curAndLenPrice < optimum.price {
optimum.price = curAndLenPrice
optimum.posPrev = 0
optimum.backPrev = distance + kNumRepDistances
optimum.prev1IsChar = false
}
if length == z.matchDistances[offs] {
offs += 2
if offs == distancePairs {
break
}
}
}
}
cur := uint32(0)
for {
cur++
if cur == lenEnd {
res = z.backward(cur)
return
}
newLen := z.readMatchDistances()
distancePairs = z.distancePairs
if newLen >= z.cl.fastBytes {
z.longestMatchLen = newLen
z.longestMatchFound = true
res = z.backward(cur)
return
}
position++
posPrev := z.optimum[cur].posPrev
var state uint32
if z.optimum[cur].prev1IsChar == true {
posPrev--
if z.optimum[cur].prev2 == true {
state = z.optimum[z.optimum[cur].posPrev2].state
if z.optimum[cur].backPrev2 < kNumRepDistances {
state = stateUpdateRep(state)
} else {
state = stateUpdateMatch(state)
}
} else {
state = z.optimum[posPrev].state
}
state = stateUpdateChar(state)
} else {
state = z.optimum[posPrev].state
}
if posPrev == cur-1 {
if z.optimum[cur].isShortRep() == true {
state = stateUpdateShortRep(state)
} else {
state = stateUpdateChar(state)
}
} else {
var pos uint32
if z.optimum[cur].prev1IsChar == true && z.optimum[cur].prev2 == true {
posPrev = z.optimum[cur].posPrev2
pos = z.optimum[cur].backPrev2
state = stateUpdateRep(state)
} else {
pos = z.optimum[cur].backPrev
if pos < kNumRepDistances {
state = stateUpdateRep(state)
} else {
state = stateUpdateMatch(state)
}
}
opt := z.optimum[posPrev]
if pos < kNumRepDistances {
if pos == 0 {
z.reps[0] = opt.backs0
z.reps[1] = opt.backs1
z.reps[2] = opt.backs2
z.reps[3] = opt.backs3
} else if pos == 1 {
z.reps[0] = opt.backs1
z.reps[1] = opt.backs0
z.reps[2] = opt.backs2
z.reps[3] = opt.backs3
} else if pos == 2 {
z.reps[0] = opt.backs2
z.reps[1] = opt.backs0
z.reps[2] = opt.backs1
z.reps[3] = opt.backs3
} else {
z.reps[0] = opt.backs3
z.reps[1] = opt.backs0
z.reps[2] = opt.backs1
z.reps[3] = opt.backs2
}
} else {
z.reps[0] = pos - kNumRepDistances
z.reps[1] = opt.backs0
z.reps[2] = opt.backs1
z.reps[3] = opt.backs2
}
}
z.optimum[cur].state = state
z.optimum[cur].backs0 = z.reps[0]
z.optimum[cur].backs1 = z.reps[1]
z.optimum[cur].backs2 = z.reps[2]
z.optimum[cur].backs3 = z.reps[3]
curPrice := z.optimum[cur].price
curByte = z.mf.iw.getIndexByte(0 - 1)
matchByte = z.mf.iw.getIndexByte(0 - int32(z.reps[0]) - 1 - 1)
posState = position & z.posStateMask
curAnd1Price := curPrice + getPrice0(z.isMatch[state<<kNumPosStatesBitsMax+posState]) +
z.litCoder.getSubCoder(position, z.mf.iw.getIndexByte(0-2)).getPrice(!stateIsCharState(state), matchByte, curByte)
nextOptimum := z.optimum[cur+1]
nextIsChar := false
if curAnd1Price < nextOptimum.price {
nextOptimum.price = curAnd1Price
nextOptimum.posPrev = cur
nextOptimum.makeAsChar()
nextIsChar = true
}
matchPrice = curPrice + getPrice1(z.isMatch[state<<kNumPosStatesBitsMax+posState])
repMatchPrice = matchPrice + getPrice1(z.isRep[state])
if matchByte == curByte && !(nextOptimum.posPrev < cur && nextOptimum.backPrev == 0) {
shortRepPrice := repMatchPrice + z.getRepLen1Price(state, posState)
if shortRepPrice <= nextOptimum.price {
nextOptimum.price = shortRepPrice
nextOptimum.posPrev = cur
nextOptimum.makeAsShortRep()
nextIsChar = true
}
}
availableBytesFull := z.mf.iw.getNumAvailableBytes() + 1
availableBytesFull = minUInt32(kNumOpts-1-cur, availableBytesFull)
availableBytes = availableBytesFull
if availableBytes < 2 {
continue
}
if availableBytes > z.cl.fastBytes {
availableBytes = z.cl.fastBytes
}
if nextIsChar == false && matchByte != curByte {
t := minUInt32(availableBytesFull-1, z.cl.fastBytes)
lenTest2 := z.mf.iw.getMatchLen(0, z.reps[0], t)
if lenTest2 >= 2 {
state2 := stateUpdateChar(state)
posStateNext := (position + 1) & z.posStateMask
nextRepMatchPrice := curAnd1Price + getPrice1(z.isMatch[state2<<kNumPosStatesBitsMax+posStateNext]) +
getPrice1(z.isRep[state2])
offset := cur + 1 + lenTest2
for lenEnd < offset {
lenEnd++
z.optimum[lenEnd].price = kInfinityPrice
}
curAndLenPrice := nextRepMatchPrice + z.getRepPrice(0, lenTest2, state2, posStateNext)
optimum := z.optimum[offset]
if curAndLenPrice < optimum.price {
optimum.price = curAndLenPrice
optimum.posPrev = cur + 1
optimum.backPrev = 0
optimum.prev1IsChar = true
optimum.prev2 = false
}
}
}
startLen := uint32(2)
for repIndex := uint32(0); repIndex < kNumRepDistances; repIndex++ {
lenTest := z.mf.iw.getMatchLen(0-1, z.reps[repIndex], availableBytes)
if lenTest < 2 {
continue
}
lenTestTemp := lenTest
DoWhile3:
for lenEnd < cur+lenTest {
lenEnd++
z.optimum[lenEnd].price = kInfinityPrice
}
curAndLenPrice := repMatchPrice + z.getRepPrice(repIndex, lenTest, state, posState)
optimum := z.optimum[cur+lenTest]
if curAndLenPrice < optimum.price {
optimum.price = curAndLenPrice
optimum.posPrev = cur
optimum.backPrev = repIndex
optimum.prev1IsChar = false
}
if lenTest--; lenTest >= 2 {
goto DoWhile3
}
lenTest = lenTestTemp
if repIndex == 0 {
startLen = lenTest + 1
}
if lenTest < availableBytesFull {
t := minUInt32(availableBytesFull-1-lenTest, z.cl.fastBytes)
lenTest2 := z.mf.iw.getMatchLen(int32(lenTest), z.reps[repIndex], t)
if lenTest2 >= 2 {
state2 := stateUpdateRep(state)
posStateNext := (position + lenTest) & z.posStateMask
curAndLenCharPrice := repMatchPrice + z.getRepPrice(repIndex, lenTest, state, posState) +
getPrice0(z.isMatch[state2<<kNumPosStatesBitsMax+posStateNext]) +
z.litCoder.getSubCoder(position+lenTest, z.mf.iw.getIndexByte(int32(lenTest)-1-1)).getPrice(
true, z.mf.iw.getIndexByte(int32(lenTest)-1-(int32(z.reps[repIndex]+1))), z.mf.iw.getIndexByte(int32(lenTest)-1))
state2 = stateUpdateChar(state2)
posStateNext = (position + lenTest + 1) & z.posStateMask
nextMatchPrice := curAndLenCharPrice + getPrice1(z.isMatch[state2<<kNumPosStatesBitsMax+posStateNext])
nextRepMatchPrice := nextMatchPrice + getPrice1(z.isRep[state2])
offset := lenTest + 1 + lenTest2
for lenEnd < cur+offset {
lenEnd++
z.optimum[lenEnd].price = kInfinityPrice
}
curAndLenPrice := nextRepMatchPrice + z.getRepPrice(0, lenTest2, state2, posStateNext)
optimum := z.optimum[cur+offset]
if curAndLenPrice < optimum.price {
optimum.price = curAndLenPrice
optimum.posPrev = cur + lenTest + 1
optimum.backPrev = 0
optimum.prev1IsChar = true
optimum.prev2 = true
optimum.posPrev2 = cur
optimum.backPrev2 = repIndex
}
}
}
}
if newLen > availableBytes {
newLen = availableBytes
for distancePairs = 0; newLen > z.matchDistances[distancePairs]; distancePairs += 2 {
// empty loop
}
z.matchDistances[distancePairs] = newLen
distancePairs += 2
}
if newLen >= startLen {
normalMatchPrice = matchPrice + getPrice0(z.isRep[state])
for lenEnd < cur+newLen {
lenEnd++
z.optimum[lenEnd].price = kInfinityPrice
}
offs := uint32(0)
for startLen > z.matchDistances[offs] {
offs += 2
}
for lenTest := startLen; ; lenTest++ {
curBack := z.matchDistances[offs+1]
curAndLenPrice := normalMatchPrice + z.getPosLenPrice(curBack, lenTest, posState)
optimum := z.optimum[cur+lenTest]
if curAndLenPrice < optimum.price {
optimum.price = curAndLenPrice
optimum.posPrev = cur
optimum.backPrev = curBack + kNumRepDistances
optimum.prev1IsChar = false
}
if lenTest == z.matchDistances[offs] {
if lenTest < availableBytesFull {
t := minUInt32(availableBytesFull-1-lenTest, z.cl.fastBytes)
lenTest2 := z.mf.iw.getMatchLen(int32(lenTest), curBack, t)
if lenTest2 >= 2 {
state2 := stateUpdateMatch(state)
posStateNext := (position + lenTest) & z.posStateMask
curAndLenCharPrice := curAndLenPrice +
getPrice0(z.isMatch[state2<<kNumPosStatesBitsMax+posStateNext]) +
z.litCoder.getSubCoder(position+lenTest, z.mf.iw.getIndexByte(int32(lenTest)-1-1)).getPrice(
true, z.mf.iw.getIndexByte(int32(lenTest)-(int32(curBack)+1)-1),
z.mf.iw.getIndexByte(int32(lenTest)-1))
state2 = stateUpdateChar(state2)
posStateNext = (position + lenTest + 1) & z.posStateMask
nextMatchPrice := curAndLenCharPrice + getPrice1(z.isMatch[state2<<kNumPosStatesBitsMax+posStateNext])
nextRepMatchPrice := nextMatchPrice + getPrice1(z.isRep[state2])
offset := lenTest + 1 + lenTest2
for lenEnd < cur+offset {
lenEnd++
z.optimum[lenEnd].price = kInfinityPrice
}
curAndLenPrice = nextRepMatchPrice + z.getRepPrice(0, lenTest2, state2, posStateNext)
optimum = z.optimum[cur+offset]
if curAndLenPrice < optimum.price {
optimum.price = curAndLenPrice
optimum.posPrev = cur + lenTest + 1
optimum.backPrev = 0
optimum.prev1IsChar = true
optimum.prev2 = true
optimum.posPrev2 = cur
optimum.backPrev2 = curBack + kNumRepDistances
}
}
}
offs += 2
if offs == distancePairs {
break
}
}
}
}
}
return
}
var tempPrices []uint32 = make([]uint32, kNumFullDistances)
func (z *encoder) fillDistancesPrices() {
for i := uint32(kStartPosModelIndex); i < kNumFullDistances; i++ {
posSlot := getPosSlot(i)
footerBits := posSlot>>1 - 1
baseVal := (2 | posSlot&1) << footerBits
tempPrices[i] = reverseGetPriceIndex(z.posCoders, baseVal-posSlot-1, footerBits, i-baseVal)
}
for lenToPosState := uint32(0); lenToPosState < kNumLenToPosStates; lenToPosState++ {
var posSlot uint32
st := lenToPosState << kNumPosSlotBits
for posSlot = 0; posSlot < z.distTableSize; posSlot++ {
z.posSlotPrices[st+posSlot] = z.posSlotCoders[lenToPosState].getPrice(posSlot)
}
for posSlot = kEndPosModelIndex; posSlot < z.distTableSize; posSlot++ {
z.posSlotPrices[st+posSlot] += (posSlot>>1 - 1 - kNumAlignBits) << kNumBitPriceShiftBits
}
var i uint32
st2 := lenToPosState * kNumFullDistances
for i = 0; i < kStartPosModelIndex; i++ {
z.distancesPrices[st2+i] = z.posSlotPrices[st+i]
}
for ; i < kNumFullDistances; i++ {
z.distancesPrices[st2+i] = z.posSlotPrices[st+getPosSlot(i)] + tempPrices[i]
}
}
z.matchPriceCount = 0
}
func (z *encoder) fillAlignPrices() {
for i := uint32(0); i < kAlignTableSize; i++ {
z.alignPrices[i] = z.posAlignCoder.reverseGetPrice(i)
}
z.alignPriceCount = 0
}
func (z *encoder) writeEndMarker(posState uint32) {
if z.writeEndMark != true {
return
}
z.re.encode(z.isMatch, z.state<<kNumPosStatesBitsMax+posState, 1)
z.re.encode(z.isRep, z.state, 0)
z.state = stateUpdateMatch(z.state)
length := kMatchMinLen
z.lenCoder.encode(z.re, 0, posState) // 0 is length - kMatchMinLen
posSlot := 1<<kNumPosSlotBits - 1
lenToPosState := getLenToPosState(uint32(length))
z.posSlotCoders[lenToPosState].encode(z.re, uint32(posSlot))
footerBits := uint32(30)
posReduced := uint32(1)<<footerBits - 1
z.re.encodeDirectBits(posReduced>>kNumAlignBits, footerBits-kNumAlignBits)
z.posAlignCoder.reverseEncode(z.re, uint32(posReduced&kAlignMask))
}
func (z *encoder) flush(nowPos uint32) {
z.writeEndMarker(nowPos & z.posStateMask)
z.re.flush()
}
func (z *encoder) codeOneBlock() {
z.finished = true
progressPosValuePrev := z.nowPos
if z.nowPos == 0 {
if z.mf.iw.getNumAvailableBytes() == 0 {
z.flush(uint32(z.nowPos))
return
}
_ = z.readMatchDistances()
z.re.encode(z.isMatch, z.state<<kNumPosStatesBitsMax+uint32(z.nowPos)&z.posStateMask, 0)
z.state = stateUpdateChar(z.state)
curByte := z.mf.iw.getIndexByte(0 - int32(z.additionalOffset))
z.litCoder.getSubCoder(uint32(z.nowPos), z.prevByte).encode(z.re, curByte)
z.prevByte = curByte
z.additionalOffset--
z.nowPos++
}
if z.mf.iw.getNumAvailableBytes() == 0 {
z.flush(uint32(z.nowPos))
return
}
for {
length := z.getOptimum(uint32(z.nowPos))
pos := z.backRes
posState := uint32(z.nowPos) & z.posStateMask
complexState := z.state<<kNumPosStatesBitsMax + posState
if length == 1 && pos == 0xFFFFFFFF {
z.re.encode(z.isMatch, complexState, 0)
curByte := z.mf.iw.getIndexByte(0 - int32(z.additionalOffset))
lsc := z.litCoder.getSubCoder(uint32(z.nowPos), z.prevByte)
if stateIsCharState(z.state) == false {
matchByte := z.mf.iw.getIndexByte(0 - int32(z.repDistances[0]) - 1 - int32(z.additionalOffset))
lsc.encodeMatched(z.re, matchByte, curByte)
} else {
lsc.encode(z.re, curByte)
}
z.prevByte = curByte
z.state = stateUpdateChar(z.state)
} else {
z.re.encode(z.isMatch, complexState, 1)
if pos < kNumRepDistances {
z.re.encode(z.isRep, z.state, 1)
if pos == 0 {
z.re.encode(z.isRepG0, z.state, 0)
if length == 1 {
z.re.encode(z.isRep0Long, complexState, 0)
} else {
z.re.encode(z.isRep0Long, complexState, 1)
}
} else {
z.re.encode(z.isRepG0, z.state, 1)
if pos == 1 {
z.re.encode(z.isRepG1, z.state, 0)
} else {
z.re.encode(z.isRepG1, z.state, 1)
z.re.encode(z.isRepG2, z.state, pos-2)
}
}
if length == 1 {
z.state = stateUpdateShortRep(z.state)
} else {
z.repMatchLenCoder.encode(z.re, length-kMatchMinLen, posState)
z.state = stateUpdateRep(z.state)
}
distance := z.repDistances[pos]
if pos != 0 {
for i := pos; i >= 1; i-- {
z.repDistances[i] = z.repDistances[i-1]
}
z.repDistances[0] = distance
}
} else {
z.re.encode(z.isRep, z.state, 0)
z.state = stateUpdateMatch(z.state)
z.lenCoder.encode(z.re, length-kMatchMinLen, posState)
pos -= kNumRepDistances
posSlot := getPosSlot(pos)
lenToPosState := getLenToPosState(length)
z.posSlotCoders[lenToPosState].encode(z.re, posSlot)
if posSlot >= kStartPosModelIndex {
footerBits := posSlot>>1 - 1
baseVal := (2 | posSlot&1) << footerBits
posReduced := pos - baseVal
if posSlot < kEndPosModelIndex {
reverseEncodeIndex(z.re, z.posCoders, baseVal-posSlot-1, footerBits, posReduced)
} else {
z.re.encodeDirectBits(posReduced>>kNumAlignBits, footerBits-kNumAlignBits)
z.posAlignCoder.reverseEncode(z.re, posReduced&kAlignMask)
z.alignPriceCount++
}
}
for i := kNumRepDistances - 1; i >= 1; i-- {
z.repDistances[i] = z.repDistances[i-1]
}
z.repDistances[0] = pos
z.matchPriceCount++
}
z.prevByte = z.mf.iw.getIndexByte(int32(length) - 1 - int32(z.additionalOffset))
}
z.additionalOffset -= length
z.nowPos += int64(length)
if z.additionalOffset == 0 {
if z.matchPriceCount >= 1<<7 {
z.fillDistancesPrices()
}
if z.alignPriceCount >= kAlignTableSize {
z.fillAlignPrices()
}
if z.mf.iw.getNumAvailableBytes() == 0 {
z.flush(uint32(z.nowPos))
return
}
if z.nowPos-progressPosValuePrev >= 1<<12 {
z.finished = false
return
}
}
}
}
func (z *encoder) doEncode() {
for {
z.codeOneBlock()
if z.finished == true {
break
}
}
}
func (z *encoder) encoder(r io.Reader, w io.Writer, size int64, level int) (err error) {
defer handlePanics(&err)
// these functions are good candidates for init() but the decoder doesn't need them
initProbPrices()
initCrcTable()
initGFastPos()
if level < 1 || level > 9 {
return &argumentValueError{"level out of range", level}
}
// do not asign &levels[level] directly to z.cl because dictSize is modified later