private PpmContext GetTempPpmContext(byte[] memory)
{
if (_tempPpmContext == null)
{
_tempPpmContext = new PpmContext(null);
}
return(_tempPpmContext.Initialize(memory));
}
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
}
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);
}