internal void nextContext()
        {
            int addr = FoundState.GetSuccessor();

            if (orderFall == 0 && addr > SubAlloc.PText)
            {
                minContext.Address = addr;
                maxContext.Address = addr;
            }
            else
            {
                updateModel();
            }
        }
        private int createSuccessors(bool Skip, State p1)
        {
            //State upState = tempState1.Initialize(null);
            StateRef upState   = tempStateRef2;
            State    tempState = tempState1.Initialize(Heap);

            // PPM_CONTEXT* pc=MinContext, * UpBranch=FoundState->Successor;
            PPMContext pc = tempPPMContext1.Initialize(Heap);

            pc.Address = minContext.Address;
            PPMContext upBranch = tempPPMContext2.Initialize(Heap);

            upBranch.Address = FoundState.GetSuccessor();

            // STATE * p, * ps[MAX_O], ** pps=ps;
            State p   = tempState2.Initialize(Heap);
            int   pps = 0;

            bool noLoop = false;

            if (!Skip)
            {
                ps[pps++] = FoundState.Address; // *pps++ = FoundState;
                if (pc.getSuffix() == 0)
                {
                    noLoop = true;
                }
            }
            if (!noLoop)
            {
                bool loopEntry = false;
                if (p1.Address != 0)
                {
                    p.Address  = p1.Address;
                    pc.Address = pc.getSuffix(); // =pc->Suffix;
                    loopEntry  = true;
                }
                do
                {
                    if (!loopEntry)
                    {
                        pc.Address = pc.getSuffix(); // pc=pc->Suffix;
                        if (pc.NumStats != 1)
                        {
                            p.Address = pc.FreqData.GetStats(); // p=pc->U.Stats
                            if (p.Symbol != FoundState.Symbol)
                            {
                                do
                                {
                                    p.IncrementAddress();
                                }while (p.Symbol != FoundState.Symbol);
                            }
                        }
                        else
                        {
                            p.Address = pc.getOneState().Address; // p=&(pc->OneState);
                        }
                    } // LOOP_ENTRY:
                    loopEntry = false;
                    if (p.GetSuccessor() != upBranch.Address)
                    {
                        pc.Address = p.GetSuccessor(); // =p->Successor;
                        break;
                    }
                    ps[pps++] = p.Address;
                }while (pc.getSuffix() != 0);
            } // NO_LOOP:
            if (pps == 0)
            {
                return(pc.Address);
            }
            upState.Symbol = Heap[upBranch.Address]; // UpState.Symbol=*(byte*)

            // UpBranch;
            // UpState.Successor=(PPM_CONTEXT*) (((byte*) UpBranch)+1);
            upState.SetSuccessor(upBranch.Address + 1); //TODO check if +1 necessary
            if (pc.NumStats != 1)
            {
                if (pc.Address <= SubAlloc.PText)
                {
                    return(0);
                }
                p.Address = pc.FreqData.GetStats();
                if (p.Symbol != upState.Symbol)
                {
                    do
                    {
                        p.IncrementAddress();
                    }while (p.Symbol != upState.Symbol);
                }
                int cf = p.Freq - 1;
                int s0 = pc.FreqData.SummFreq - pc.NumStats - cf;

                // UpState.Freq=1+((2*cf <= s0)?(5*cf > s0):((2*cf+3*s0-1)/(2*s0)));
                upState.Freq = 1 + ((2 * cf <= s0) ? (5 * cf > s0 ? 1 : 0) : ((2 * cf + 3 * s0 - 1) / (2 * s0)));
            }
            else
            {
                upState.Freq = pc.getOneState().Freq; // UpState.Freq=pc->OneState.Freq;
            }
            do
            {
                // pc = pc->createChild(this,*--pps,UpState);
                tempState.Address = ps[--pps];
                pc.Address        = pc.createChild(this, tempState, upState);
                if (pc.Address == 0)
                {
                    return(0);
                }
            }while (pps != 0);
            return(pc.Address);
        }
        private void updateModel()
        {
            //System.out.println("ModelPPM.updateModel()");
            // STATE fs = *FoundState, *p = NULL;
            StateRef fs = tempStateRef1;

            fs.Values = FoundState;
            State p         = tempState3.Initialize(Heap);
            State tempState = tempState4.Initialize(Heap);

            PPMContext pc        = tempPPMContext3.Initialize(Heap);
            PPMContext successor = tempPPMContext4.Initialize(Heap);

            int ns1, ns, cf, sf, s0;

            pc.Address = minContext.getSuffix();
            if (fs.Freq < MAX_FREQ / 4 && pc.Address != 0)
            {
                if (pc.NumStats != 1)
                {
                    p.Address = pc.FreqData.GetStats();
                    if (p.Symbol != fs.Symbol)
                    {
                        do
                        {
                            p.IncrementAddress();
                        }while (p.Symbol != fs.Symbol);
                        tempState.Address = p.Address - State.Size;
                        if (p.Freq >= tempState.Freq)
                        {
                            State.PPMDSwap(p, tempState);
                            p.DecrementAddress();
                        }
                    }
                    if (p.Freq < MAX_FREQ - 9)
                    {
                        p.IncrementFreq(2);
                        pc.FreqData.IncrementSummFreq(2);
                    }
                }
                else
                {
                    p.Address = pc.getOneState().Address;
                    if (p.Freq < 32)
                    {
                        p.IncrementFreq(1);
                    }
                }
            }
            if (orderFall == 0)
            {
                FoundState.SetSuccessor(createSuccessors(true, p));
                minContext.Address = FoundState.GetSuccessor();
                maxContext.Address = FoundState.GetSuccessor();
                if (minContext.Address == 0)
                {
                    updateModelRestart();
                    return;
                }
                return;
            }
            SubAlloc.Heap[SubAlloc.PText] = (byte)fs.Symbol;
            SubAlloc.incPText();
            successor.Address = SubAlloc.PText;
            if (SubAlloc.PText >= SubAlloc.FakeUnitsStart)
            {
                updateModelRestart();
                return;
            }

            //        // Debug
            //        subAlloc.dumpHeap();
            if (fs.GetSuccessor() != 0)
            {
                if (fs.GetSuccessor() <= SubAlloc.PText)
                {
                    fs.SetSuccessor(createSuccessors(false, p));
                    if (fs.GetSuccessor() == 0)
                    {
                        updateModelRestart();
                        return;
                    }
                }
                if (--orderFall == 0)
                {
                    successor.Address = fs.GetSuccessor();
                    if (maxContext.Address != minContext.Address)
                    {
                        SubAlloc.decPText(1);
                    }
                }
            }
            else
            {
                FoundState.SetSuccessor(successor.Address);
                fs.SetSuccessor(minContext);
            }

            //        // Debug
            //        subAlloc.dumpHeap();
            ns = minContext.NumStats;
            s0 = minContext.FreqData.SummFreq - (ns) - (fs.Freq - 1);
            for (pc.Address = maxContext.Address; pc.Address != minContext.Address; pc.Address = pc.getSuffix())
            {
                if ((ns1 = pc.NumStats) != 1)
                {
                    if ((ns1 & 1) == 0)
                    {
                        //System.out.println(ns1);
                        pc.FreqData.SetStats(SubAlloc.expandUnits(pc.FreqData.GetStats(), Utility.URShift(ns1, 1)));
                        if (pc.FreqData.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.FreqData.SummFreq <= 8 * ns1) ? 1 : 0));
                    pc.FreqData.IncrementSummFreq(sum);
                }
                else
                {
                    p.Address = SubAlloc.allocUnits(1);
                    if (p.Address == 0)
                    {
                        updateModelRestart();
                        return;
                    }
                    p.SetValues(pc.getOneState());
                    pc.FreqData.SetStats(p);
                    if (p.Freq < MAX_FREQ / 4 - 1)
                    {
                        p.IncrementFreq(p.Freq);
                    }
                    else
                    {
                        p.Freq = MAX_FREQ - 4;
                    }
                    pc.FreqData.SummFreq = (p.Freq + initEsc + (ns > 3 ? 1 : 0));
                }
                cf = 2 * fs.Freq * (pc.FreqData.SummFreq + 6);
                sf = s0 + pc.FreqData.SummFreq;
                if (cf < 6 * sf)
                {
                    cf = 1 + (cf > sf ? 1 : 0) + (cf >= 4 * sf ? 1 : 0);
                    pc.FreqData.IncrementSummFreq(3);
                }
                else
                {
                    cf = 4 + (cf >= 9 * sf ? 1 : 0) + (cf >= 12 * sf ? 1 : 0) + (cf >= 15 * sf ? 1 : 0);
                    pc.FreqData.IncrementSummFreq(cf);
                }
                p.Address = pc.FreqData.GetStats() + ns1 * State.Size;
                p.SetSuccessor(successor);
                p.Symbol    = fs.Symbol;
                p.Freq      = cf;
                pc.NumStats = ++ns1;
            }

            int address = fs.GetSuccessor();

            maxContext.Address = address;
            minContext.Address = address;

            //TODO-----debug
            //		int pos = minContext.getFreqData().getStats();
            //		State a = new State(getHeap());
            //		a.Address=pos);
            //		pos+=State.size;
            //		a.Address=pos);
            //--dbg end
        }
        public virtual int decodeChar()
        {
            // Debug
            //subAlloc.dumpHeap();

            if (minContext.Address <= SubAlloc.PText || minContext.Address > SubAlloc.HeapEnd)
            {
                return(-1);
            }

            if (minContext.NumStats != 1)
            {
                if (minContext.FreqData.GetStats() <= SubAlloc.PText ||
                    minContext.FreqData.GetStats() > SubAlloc.HeapEnd)
                {
                    return(-1);
                }
                if (!minContext.decodeSymbol1(this))
                {
                    return(-1);
                }
            }
            else
            {
                minContext.decodeBinSymbol(this);
            }
            Coder.Decode();
            while (FoundState.Address == 0)
            {
                Coder.AriDecNormalize();
                do
                {
                    orderFall++;
                    minContext.Address = minContext.getSuffix(); // =MinContext->Suffix;
                    if (minContext.Address <= SubAlloc.PText || minContext.Address > SubAlloc.HeapEnd)
                    {
                        return(-1);
                    }
                }while (minContext.NumStats == numMasked);
                if (!minContext.decodeSymbol2(this))
                {
                    return(-1);
                }
                Coder.Decode();
            }
            int Symbol = FoundState.Symbol;

            if ((orderFall == 0) && FoundState.GetSuccessor() > SubAlloc.PText)
            {
                // MinContext=MaxContext=FoundState->Successor;
                int addr = FoundState.GetSuccessor();
                minContext.Address = addr;
                maxContext.Address = addr;
            }
            else
            {
                updateModel();

                //this.foundState.Address=foundState.Address);//TODO just 4 debugging
                if (escCount == 0)
                {
                    clearMask();
                }
            }
            Coder.AriDecNormalize(); // ARI_DEC_NORMALIZE(Coder.code,Coder.low,Coder.range,Coder.UnpackRead);
            return(Symbol);
        }