/*
* Copyright (c) 2007 innoSysTec (R) GmbH, Germany. All rights reserved.
* Original author: Edmund Wagner
* Creation date: 31.05.2007
*
* Source: $HeadURL$
* Last changed: $LastChangedDate$
*
* the unrar licence applies to all junrar source and binary distributions
* you are not allowed to use this source to re-create the RAR compression algorithm
*
* Here some html entities which can be used for escaping javadoc tags:
* "&": "&" or "&"
* "<": "<" or "<"
* ">": ">" or ">"
* "@": "@"
*/
package com.github.junrar.unpack.ppm;
import java.io.IOException;
import java.util.Arrays;
import com.github.junrar.exception.RarException;
import com.github.junrar.unpack.Unpack;
/**
* DOCUMENT ME
*
* @author $LastChangedBy$
* @version $LastChangedRevision$
*/
public class ModelPPM
{
public static final int MAX_O = 64; /* maximum allowed model order */
public static final int INT_BITS = 7;
public static final int PERIOD_BITS = 7;
public static final int TOT_BITS = INT_BITS + PERIOD_BITS;
public static final int INTERVAL = 1 << INT_BITS;
public static final int BIN_SCALE = 1 << TOT_BITS;
public static final int MAX_FREQ = 124;
private SEE2Context[][] SEE2Cont = new SEE2Context[25][16];
private SEE2Context dummySEE2Cont;
private PPMContext minContext, medContext, maxContext;
private State foundState; // found next state transition
private int numMasked, initEsc, orderFall, maxOrder, runLength, initRL;
private int[] charMask = new int[256];
private int[] NS2Indx = new int[256];
private int[] NS2BSIndx = new int[256];
private int[] HB2Flag = new int[256];
// byte EscCount, PrevSuccess, HiBitsFlag;
private int escCount, prevSuccess, hiBitsFlag;
private int[][] binSumm = new int[128][64]; // binary SEE-contexts
private RangeCoder coder = new RangeCoder();
private SubAllocator subAlloc = new SubAllocator();
private static int InitBinEsc[] = { 0x3CDD, 0x1F3F, 0x59BF, 0x48F3,
0x64A1, 0x5ABC, 0x6632, 0x6051 };
// Temp fields
private final State tempState1 = new State(null);
private final State tempState2 = new State(null);
private final State tempState3 = new State(null);
private final State tempState4 = new State(null);
private final StateRef tempStateRef1 = new StateRef();
private final StateRef tempStateRef2 = new StateRef();
private final PPMContext tempPPMContext1 = new PPMContext(null);
private final PPMContext tempPPMContext2 = new PPMContext(null);
private final PPMContext tempPPMContext3 = new PPMContext(null);
private final PPMContext tempPPMContext4 = new PPMContext(null);
private final int[] ps = new int[MAX_O];
public ModelPPM()
{
minContext = null;
maxContext = null;
medContext = null;
}
public SubAllocator getSubAlloc()
{
return subAlloc;
}
private void restartModelRare()
{
Arrays.fill(charMask, 0);
subAlloc.initSubAllocator();
initRL = -(maxOrder < 12 ? maxOrder : 12) - 1;
int addr = subAlloc.allocContext();
minContext.setAddress(addr);
maxContext.setAddress(addr);
minContext.setSuffix(0);
orderFall = maxOrder;
minContext.setNumStats(256);
minContext.getFreqData().setSummFreq(minContext.getNumStats()+1);
addr = subAlloc.allocUnits(256 / 2);
foundState.setAddress(addr);
minContext.getFreqData().setStats(addr);
State state = new State(subAlloc.getHeap());
addr = minContext.getFreqData().getStats();
runLength = initRL;
prevSuccess = 0;
for (int i = 0; i < 256; i++) {
state.setAddress(addr + i * State.size);
state.setSymbol(i);
state.setFreq(1);
state.setSuccessor(0);
}
for (int i = 0; i < 128; i++) {
for (int k = 0; k < 8; k++) {
for (int m = 0; m < 64; m += 8) {
binSumm[i][k + m] = BIN_SCALE - InitBinEsc[k] / (i + 2);
}
}
}
for (int i = 0; i < 25; i++) {
for (int k = 0; k < 16; k++) {
SEE2Cont[i][k].init(5 * i + 10);
}
}
}
private void startModelRare(int MaxOrder)
{
int i, k, m, Step;
escCount = 1;
this.maxOrder = MaxOrder;
restartModelRare();
// Bug Fixed
NS2BSIndx[0] = 0;
NS2BSIndx[1] = 2;
for (int j = 0; j < 9; j++) {
NS2BSIndx[2 + j] = 4;
}
for (int j = 0; j < 256 - 11; j++) {
NS2BSIndx[11 + j] = 6;
}
for (i = 0; i < 3; i++) {
NS2Indx[i] = i;
}
for (m = i, k = 1, Step = 1; i < 256; i++) {
NS2Indx[i] = m;
if ((--k) == 0) {
k = ++Step;
m++;
}
}
for (int j = 0; j < 0x40; j++) {
HB2Flag[j] = 0;
}
for (int j = 0; j < 0x100 - 0x40; j++) {
HB2Flag[0x40 + j] = 0x08;
}
dummySEE2Cont.setShift(PERIOD_BITS);
}
private void clearMask()
{
escCount = 1;
Arrays.fill(charMask, 0);
}
public boolean decodeInit(Unpack unpackRead, int escChar/* ref */)
throws IOException, RarException
{
int MaxOrder = unpackRead.getChar() & 0xff;
boolean reset = ((MaxOrder & 0x20) != 0);
int MaxMB = 0;
if (reset) {
MaxMB = unpackRead.getChar();
} else {
if (subAlloc.GetAllocatedMemory() == 0) {
return (false);
}
}
if ((MaxOrder & 0x40) != 0) {
escChar = unpackRead.getChar();
unpackRead.setPpmEscChar(escChar);
}
coder.initDecoder(unpackRead);
if (reset) {
MaxOrder = (MaxOrder & 0x1f) + 1;
if (MaxOrder > 16) {
MaxOrder = 16 + (MaxOrder - 16) * 3;
}
if (MaxOrder == 1) {
subAlloc.stopSubAllocator();
return (false);
}
subAlloc.startSubAllocator(MaxMB + 1);
minContext = new PPMContext(getHeap());
medContext = new PPMContext(getHeap());
maxContext = new PPMContext(getHeap());
foundState = new State(getHeap());
dummySEE2Cont = new SEE2Context();
for (int i = 0; i < 25; i++) {
for (int j = 0; j < 16; j++) {
SEE2Cont[i][j] = new SEE2Context();
}
}
startModelRare(MaxOrder);
}
return (minContext.getAddress() != 0);
}
public int decodeChar() throws IOException, RarException
{
// Debug
//subAlloc.dumpHeap();
if (minContext.getAddress() <= subAlloc.getPText()
|| minContext.getAddress() > subAlloc.getHeapEnd()) {
return (-1);
}
if (minContext.getNumStats() != 1) {
if (minContext.getFreqData().getStats() <= subAlloc.getPText()
|| minContext.getFreqData().getStats() > subAlloc.getHeapEnd()) {
return (-1);
}
if (!minContext.decodeSymbol1(this)) {
return (-1);
}
} else {
minContext.decodeBinSymbol(this);
}
coder.decode();
while (foundState.getAddress() == 0) {
coder.ariDecNormalize();
do {
orderFall++;
minContext.setAddress(minContext.getSuffix());// =MinContext->Suffix;
if (minContext.getAddress() <= subAlloc.getPText()
|| minContext.getAddress() > subAlloc.getHeapEnd()) {
return (-1);
}
} while (minContext.getNumStats() == numMasked);
if (!minContext.decodeSymbol2(this)) {
return (-1);
}
coder.decode();
}
int Symbol = foundState.getSymbol();
if ((orderFall == 0) && foundState.getSuccessor() > subAlloc.getPText()) {
// MinContext=MaxContext=FoundState->Successor;
int addr = foundState.getSuccessor();
minContext.setAddress(addr);
maxContext.setAddress(addr);
} else {
updateModel();
//this.foundState.setAddress(foundState.getAddress());//TODO just 4 debugging
if (escCount == 0) {
clearMask();
}
}
coder.ariDecNormalize();// ARI_DEC_NORMALIZE(Coder.code,Coder.low,Coder.range,Coder.UnpackRead);
return (Symbol);
}
public SEE2Context[][] getSEE2Cont()
{
return SEE2Cont;
}
public SEE2Context getDummySEE2Cont()
{
return dummySEE2Cont;
}
public int getInitRL()
{
return initRL;
}
public void setEscCount(int escCount)
{
this.escCount = escCount&0xff;
}
public int getEscCount()
{
return escCount;
}
public void incEscCount(int dEscCount) {
setEscCount(getEscCount() + dEscCount);
}
public int[] getCharMask()
{
return charMask;
}
public int getNumMasked()
{
return numMasked;
}
public void setNumMasked(int numMasked)
{
this.numMasked = numMasked;
}
public void setPrevSuccess(int prevSuccess)
{
this.prevSuccess = prevSuccess&0xff;
}
public int getInitEsc()
{
return initEsc;
}
public void setInitEsc(int initEsc)
{
this.initEsc = initEsc;
}
public void setRunLength(int runLength)
{
this.runLength = runLength;
}
public int getRunLength()
{
return runLength;
}
public void incRunLength(int dRunLength) {
setRunLength(getRunLength() + dRunLength);
}
public int getPrevSuccess()
{
return prevSuccess;
}
public int getHiBitsFlag()
{
return hiBitsFlag;
}
public void setHiBitsFlag(int hiBitsFlag)
{
this.hiBitsFlag = hiBitsFlag&0xff;
}
public int[][] getBinSumm()
{
return binSumm;
}
public RangeCoder getCoder()
{
return coder;
}
public int[] getHB2Flag()
{
return HB2Flag;
}
public int[] getNS2BSIndx()
{
return NS2BSIndx;
}
public int[] getNS2Indx()
{
return NS2Indx;
}
public State getFoundState()
{
return foundState;
}
public byte[] getHeap()
{
return subAlloc.getHeap();
}
public int getOrderFall()
{
return orderFall;
}
private int /* ppmcontext ptr */createSuccessors(boolean Skip,
State p1 /* state ptr */) {
//State upState = tempState1.init(null);
StateRef upState = tempStateRef2;
State tempState = tempState1.init(getHeap());
// PPM_CONTEXT* pc=MinContext, * UpBranch=FoundState->Successor;
PPMContext pc = tempPPMContext1.init(getHeap());
pc.setAddress(minContext.getAddress());
PPMContext upBranch = tempPPMContext2.init(getHeap());
upBranch.setAddress(foundState.getSuccessor());
// STATE * p, * ps[MAX_O], ** pps=ps;
State p = tempState2.init(getHeap());
int pps = 0;
boolean noLoop = false;
if (!Skip) {
ps[pps++] = foundState.getAddress();// *pps++ = FoundState;
if (pc.getSuffix() == 0) {
noLoop = true;
}
}
if (!noLoop) {
boolean loopEntry = false;
if (p1.getAddress() != 0) {
p.setAddress(p1.getAddress());
pc.setAddress(pc.getSuffix());// =pc->Suffix;
loopEntry = true;
}
do {
if (!loopEntry) {
pc.setAddress(pc.getSuffix());// pc=pc->Suffix;
if (pc.getNumStats() != 1) {
p.setAddress(pc.getFreqData().getStats());// p=pc->U.Stats
if (p.getSymbol() != foundState.getSymbol()) {
do {
p.incAddress();
} while (p.getSymbol() != foundState.getSymbol());
}
} else {
p.setAddress(pc.getOneState().getAddress());// p=&(pc->OneState);
}
}// LOOP_ENTRY:
loopEntry = false;
if (p.getSuccessor() != upBranch.getAddress()) {
pc.setAddress(p.getSuccessor());// =p->Successor;
break;
}
ps[pps++] = p.getAddress();
} while (pc.getSuffix() != 0);
} // NO_LOOP:
if (pps == 0) {
return pc.getAddress();
}
upState.setSymbol(getHeap()[upBranch.getAddress()]);// UpState.Symbol=*(byte*)
// UpBranch;
// UpState.Successor=(PPM_CONTEXT*) (((byte*) UpBranch)+1);
upState.setSuccessor(upBranch.getAddress() + 1); //TODO check if +1 necessary
if (pc.getNumStats() != 1) {
if (pc.getAddress() <= subAlloc.getPText()) {
return (0);
}
p.setAddress(pc.getFreqData().getStats());
if (p.getSymbol() != upState.getSymbol()) {
do {
p.incAddress();
} while (p.getSymbol() != upState.getSymbol());
}
int cf = p.getFreq() - 1;
int s0 = pc.getFreqData().getSummFreq() - pc.getNumStats() - cf;
// UpState.Freq=1+((2*cf <= s0)?(5*cf > s0):((2*cf+3*s0-1)/(2*s0)));
upState.setFreq(1 + ((2 * cf <= s0) ? (5 * cf > s0 ? 1 : 0) :
((2 * cf + 3 * s0 - 1) / (2 * s0))));
} else {
upState.setFreq(pc.getOneState().getFreq());// UpState.Freq=pc->OneState.Freq;
}
do {
// pc = pc->createChild(this,*--pps,UpState);
tempState.setAddress(ps[--pps]);
pc.setAddress(pc.createChild(this, tempState, upState));
if (pc.getAddress() == 0) {
return 0;
}
} while (pps != 0);
return pc.getAddress();
}
private void updateModelRestart()
{
restartModelRare();
escCount = 0;
}
private void updateModel()
{
//System.out.println("ModelPPM.updateModel()");
// STATE fs = *FoundState, *p = NULL;
StateRef fs = tempStateRef1;
fs.setValues(foundState);
State p = tempState3.init(getHeap());
State tempState = tempState4.init(getHeap());
PPMContext pc = tempPPMContext3.init(getHeap());
PPMContext successor = tempPPMContext4.init(getHeap());
int ns1, ns, cf, sf, s0;
pc.setAddress(minContext.getSuffix());
if (fs.getFreq() < MAX_FREQ / 4 && pc.getAddress() != 0) {
if (pc.getNumStats() != 1) {
p.setAddress(pc.getFreqData().getStats());
if (p.getSymbol() != fs.getSymbol()) {
do {
p.incAddress();
} while (p.getSymbol() != fs.getSymbol());
tempState.setAddress(p.getAddress() - State.size);
if (p.getFreq() >= tempState.getFreq()) {
State.ppmdSwap(p, tempState);
p.decAddress();
}
}
if (p.getFreq() < MAX_FREQ - 9) {
p.incFreq(2);
pc.getFreqData().incSummFreq(2);
}
} else {
p.setAddress(pc.getOneState().getAddress());
if (p.getFreq() < 32) {
p.incFreq(1);
}
}
}
if (orderFall == 0) {
foundState.setSuccessor(createSuccessors(true, p));
minContext.setAddress(foundState.getSuccessor());
maxContext.setAddress(foundState.getSuccessor());
if (minContext.getAddress() == 0) {
updateModelRestart();
return;
}
return;
}
subAlloc.getHeap()[subAlloc.getPText()] = (byte)fs.getSymbol();
subAlloc.incPText();
successor.setAddress(subAlloc.getPText());
if (subAlloc.getPText() >= subAlloc.getFakeUnitsStart()) {
updateModelRestart();
return;
}
// // Debug
// subAlloc.dumpHeap();
if (fs.getSuccessor() != 0) {
if (fs.getSuccessor() <= subAlloc.getPText()) {
fs.setSuccessor(createSuccessors(false, p));
if (fs.getSuccessor() == 0) {
updateModelRestart();
return;
}
}
if (--orderFall == 0) {
successor.setAddress(fs.getSuccessor());
if (maxContext.getAddress() != minContext.getAddress()) {
subAlloc.decPText(1);
}
}
}
else {
foundState.setSuccessor(successor.getAddress());
fs.setSuccessor(minContext);
}
// // Debug
// subAlloc.dumpHeap();
ns = minContext.getNumStats();
s0 = minContext.getFreqData().getSummFreq() - (ns) - (fs.getFreq() - 1);
for (pc.setAddress(maxContext.getAddress());
pc.getAddress() != minContext.getAddress();
pc.setAddress(pc.getSuffix())) {
if ((ns1 = pc.getNumStats()) != 1) {
if ((ns1 & 1) == 0) {
//System.out.println(ns1);
pc.getFreqData().setStats(
subAlloc.expandUnits(pc.getFreqData().getStats(),
ns1 >>> 1));
if (pc.getFreqData().getStats() == 0) {
updateModelRestart();
return;
}
}
// bug fixed
// int sum = ((2 * ns1 < ns) ? 1 : 0) +
// 2 * ((4 * ((ns1 <= ns) ? 1 : 0)) & ((pc.getFreqData()
// .getSummFreq() <= 8 * ns1) ? 1 : 0));
int sum = ((2 * ns1 < ns) ? 1 : 0) + 2 * (
((4 * ns1 <= ns) ? 1 : 0) &
((pc.getFreqData().getSummFreq() <= 8 * ns1) ? 1 : 0)
);
pc.getFreqData().incSummFreq(sum);
}
else {
p.setAddress(subAlloc.allocUnits(1));
if (p.getAddress() == 0) {
updateModelRestart();
return;
}
p.setValues(pc.getOneState());
pc.getFreqData().setStats(p);
if (p.getFreq() < MAX_FREQ / 4 - 1) {
p.incFreq(p.getFreq());
}
else {
p.setFreq(MAX_FREQ - 4);
}
pc.getFreqData().setSummFreq(
(p.getFreq() + initEsc + (ns > 3 ? 1 : 0)));
}
cf = 2 * fs.getFreq() * (pc.getFreqData().getSummFreq() + 6);
sf = s0 + pc.getFreqData().getSummFreq();
if (cf < 6 * sf) {
cf = 1 + (cf > sf ? 1 : 0) + (cf >= 4 * sf ? 1 : 0);
pc.getFreqData().incSummFreq(3);
}
else {
cf = 4 + (cf >= 9 * sf ? 1 : 0) + (cf >= 12 * sf ? 1 : 0) +
(cf >= 15 * sf ? 1 : 0);
pc.getFreqData().incSummFreq(cf);
}
p.setAddress(pc.getFreqData().getStats() + ns1*State.size);
p.setSuccessor(successor);
p.setSymbol(fs.getSymbol());
p.setFreq(cf);
pc.setNumStats(++ns1);
}
int address = fs.getSuccessor();
maxContext.setAddress(address);
minContext.setAddress(address);
//TODO-----debug
// int pos = minContext.getFreqData().getStats();
// State a = new State(getHeap());
// a.setAddress(pos);
// pos+=State.size;
// a.setAddress(pos);
//--dbg end
return;
}
// Debug
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append("ModelPPM[");
buffer.append("\n numMasked=");
buffer.append(numMasked);
buffer.append("\n initEsc=");
buffer.append(initEsc);
buffer.append("\n orderFall=");
buffer.append(orderFall);
buffer.append("\n maxOrder=");
buffer.append(maxOrder);
buffer.append("\n runLength=");
buffer.append(runLength);
buffer.append("\n initRL=");
buffer.append(initRL);
buffer.append("\n escCount=");
buffer.append(escCount);
buffer.append("\n prevSuccess=");
buffer.append(prevSuccess);
buffer.append("\n foundState=");
buffer.append(foundState);
buffer.append("\n coder=");
buffer.append(coder);
buffer.append("\n subAlloc=");
buffer.append(subAlloc);
buffer.append("\n]");
return buffer.toString();
}
// Debug
// public void dumpHeap() {
// subAlloc.dumpHeap();
// }
}