internal bool decodeSymbol2(ModelPPM model)
{
int diff = this.NumStats - model.NumMasked;
SEE2Context context = this.makeEscFreq2(model, diff);
RangeCoder coder = model.Coder;
SharpCompress.Compressor.PPMd.H.State state = this.tempState1.Initialize(model.Heap);
SharpCompress.Compressor.PPMd.H.State state2 = this.tempState2.Initialize(model.Heap);
state.Address = this.freqData.GetStats() - 6;
int index = 0;
int dScale = 0;
do
{
do
{
state.IncrementAddress();
}while (model.CharMask[state.Symbol] == model.EscCount);
dScale += state.Freq;
this.ps[index++] = state.Address;
}while (--diff != 0);
coder.SubRange.incScale(dScale);
long currentCount = coder.CurrentCount;
if (currentCount >= coder.SubRange.Scale)
{
return(false);
}
index = 0;
state.Address = this.ps[index];
if (currentCount < dScale)
{
dScale = 0;
while ((dScale += state.Freq) <= currentCount)
{
state.Address = this.ps[++index];
}
coder.SubRange.HighCount = dScale;
coder.SubRange.LowCount = dScale - state.Freq;
context.update();
this.update2(model, state.Address);
}
else
{
coder.SubRange.LowCount = dScale;
coder.SubRange.HighCount = coder.SubRange.Scale;
diff = this.NumStats - model.NumMasked;
index--;
do
{
state2.Address = this.ps[++index];
model.CharMask[state2.Symbol] = model.EscCount;
}while (--diff != 0);
context.incSumm((int)coder.SubRange.Scale);
model.NumMasked = this.NumStats;
}
return(true);
}
private int createSuccessors(bool Skip, SharpCompress.Compressor.PPMd.H.State p1)
{
StateRef firstState = this.tempStateRef2;
SharpCompress.Compressor.PPMd.H.State pStats = this.tempState1.Initialize(this.Heap);
PPMContext context = this.tempPPMContext1.Initialize(this.Heap);
context.Address = this.minContext.Address;
PPMContext context2 = this.tempPPMContext2.Initialize(this.Heap);
context2.Address = this.foundState.GetSuccessor();
SharpCompress.Compressor.PPMd.H.State state2 = this.tempState2.Initialize(this.Heap);
int num = 0;
bool flag = false;
if (!Skip)
{
this.ps[num++] = this.foundState.Address;
if (context.getSuffix() == 0)
{
flag = true;
}
}
if (flag)
{
goto Label_01E0;
}
bool flag2 = false;
if (p1.Address != 0)
{
state2.Address = p1.Address;
context.Address = context.getSuffix();
flag2 = true;
}
Label_00F2:
if (!flag2)
{
context.Address = context.getSuffix();
if (context.NumStats != 1)
{
state2.Address = context.FreqData.GetStats();
if (state2.Symbol != this.foundState.Symbol)
{
do
{
state2.IncrementAddress();
}while (state2.Symbol != this.foundState.Symbol);
}
}
else
{
state2.Address = context.getOneState().Address;
}
}
flag2 = false;
if (state2.GetSuccessor() != context2.Address)
{
context.Address = state2.GetSuccessor();
}
else
{
this.ps[num++] = state2.Address;
if (context.getSuffix() != 0)
{
goto Label_00F2;
}
}
Label_01E0:
if (num != 0)
{
firstState.Symbol = this.Heap[context2.Address];
firstState.SetSuccessor((int)(context2.Address + 1));
if (context.NumStats != 1)
{
if (context.Address <= this.subAlloc.PText)
{
return(0);
}
state2.Address = context.FreqData.GetStats();
if (state2.Symbol != firstState.Symbol)
{
do
{
state2.IncrementAddress();
}while (state2.Symbol != firstState.Symbol);
}
int num2 = state2.Freq - 1;
int num3 = (context.FreqData.SummFreq - context.NumStats) - num2;
firstState.Freq = 1 + (((2 * num2) <= num3) ? (((5 * num2) > num3) ? 1 : 0) : ((((2 * num2) + (3 * num3)) - 1) / (2 * num3)));
}
else
{
firstState.Freq = context.getOneState().Freq;
}
do
{
pStats.Address = this.ps[--num];
context.Address = context.createChild(this, pStats, firstState);
if (context.Address == 0)
{
return(0);
}
}while (num != 0);
}
return(context.Address);
}
private void updateModel()
{
StateRef ref2 = this.tempStateRef1;
ref2.Values = this.foundState;
SharpCompress.Compressor.PPMd.H.State state = this.tempState3.Initialize(this.Heap);
SharpCompress.Compressor.PPMd.H.State state2 = this.tempState4.Initialize(this.Heap);
PPMContext context = this.tempPPMContext3.Initialize(this.Heap);
PPMContext successor = this.tempPPMContext4.Initialize(this.Heap);
context.Address = this.minContext.getSuffix();
if ((ref2.Freq < 0x1f) && (context.Address != 0))
{
if (context.NumStats != 1)
{
state.Address = context.FreqData.GetStats();
if (state.Symbol != ref2.Symbol)
{
do
{
state.IncrementAddress();
}while (state.Symbol != ref2.Symbol);
state2.Address = state.Address - 6;
if (state.Freq >= state2.Freq)
{
SharpCompress.Compressor.PPMd.H.State.PPMDSwap(state, state2);
state.DecrementAddress();
}
}
if (state.Freq < 0x73)
{
state.IncrementFreq(2);
context.FreqData.IncrementSummFreq(2);
}
}
else
{
state.Address = context.getOneState().Address;
if (state.Freq < 0x20)
{
state.IncrementFreq(1);
}
}
}
if (this.orderFall == 0)
{
this.foundState.SetSuccessor(this.createSuccessors(true, state));
this.minContext.Address = this.foundState.GetSuccessor();
this.maxContext.Address = this.foundState.GetSuccessor();
if (this.minContext.Address == 0)
{
this.updateModelRestart();
}
}
else
{
this.subAlloc.Heap[this.subAlloc.PText] = (byte)ref2.Symbol;
this.subAlloc.incPText();
successor.Address = this.subAlloc.PText;
if (this.subAlloc.PText >= this.subAlloc.FakeUnitsStart)
{
this.updateModelRestart();
}
else
{
if (ref2.GetSuccessor() != 0)
{
if (ref2.GetSuccessor() <= this.subAlloc.PText)
{
ref2.SetSuccessor(this.createSuccessors(false, state));
if (ref2.GetSuccessor() == 0)
{
this.updateModelRestart();
return;
}
}
if (--this.orderFall == 0)
{
successor.Address = ref2.GetSuccessor();
if (this.maxContext.Address != this.minContext.Address)
{
this.subAlloc.decPText(1);
}
}
}
else
{
this.foundState.SetSuccessor(successor.Address);
ref2.SetSuccessor(this.minContext);
}
int numStats = this.minContext.NumStats;
int num5 = (this.minContext.FreqData.SummFreq - numStats) - (ref2.Freq - 1);
context.Address = this.maxContext.Address;
while (context.Address != this.minContext.Address)
{
int number = context.NumStats;
if (number != 1)
{
if ((number & 1) == 0)
{
context.FreqData.SetStats(this.subAlloc.expandUnits(context.FreqData.GetStats(), Utility.URShift(number, 1)));
if (context.FreqData.GetStats() == 0)
{
this.updateModelRestart();
return;
}
}
int num6 = (((2 * number) < numStats) ? 1 : 0) + (2 * ((((4 * number) <= numStats) ? 1 : 0) & ((context.FreqData.SummFreq <= (8 * number)) ? 1 : 0)));
context.FreqData.IncrementSummFreq(num6);
}
else
{
state.Address = this.subAlloc.allocUnits(1);
if (state.Address == 0)
{
this.updateModelRestart();
return;
}
state.SetValues(context.getOneState());
context.FreqData.SetStats(state);
if (state.Freq < 30)
{
state.IncrementFreq(state.Freq);
}
else
{
state.Freq = 120;
}
context.FreqData.SummFreq = (state.Freq + this.initEsc) + ((numStats > 3) ? 1 : 0);
}
int dSummFreq = (2 * ref2.Freq) * (context.FreqData.SummFreq + 6);
int num4 = num5 + context.FreqData.SummFreq;
if (dSummFreq < (6 * num4))
{
dSummFreq = (1 + ((dSummFreq > num4) ? 1 : 0)) + ((dSummFreq >= (4 * num4)) ? 1 : 0);
context.FreqData.IncrementSummFreq(3);
}
else
{
dSummFreq = ((4 + ((dSummFreq >= (9 * num4)) ? 1 : 0)) + ((dSummFreq >= (12 * num4)) ? 1 : 0)) + ((dSummFreq >= (15 * num4)) ? 1 : 0);
context.FreqData.IncrementSummFreq(dSummFreq);
}
state.Address = context.FreqData.GetStats() + (number * 6);
state.SetSuccessor(successor);
state.Symbol = ref2.Symbol;
state.Freq = dSummFreq;
context.NumStats = ++number;
context.Address = context.getSuffix();
}
int num7 = ref2.GetSuccessor();
this.maxContext.Address = num7;
this.minContext.Address = num7;
}
}
}
internal void rescale(ModelPPM model)
{
StateRef ref2;
int numStats = this.NumStats;
int num2 = this.NumStats - 1;
SharpCompress.Compressor.PPMd.H.State state = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
SharpCompress.Compressor.PPMd.H.State state2 = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
SharpCompress.Compressor.PPMd.H.State state3 = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
state2.Address = model.FoundState.Address;
while (state2.Address != this.freqData.GetStats())
{
state3.Address = state2.Address - 6;
SharpCompress.Compressor.PPMd.H.State.PPMDSwap(state2, state3);
state2.DecrementAddress();
}
state3.Address = this.freqData.GetStats();
state3.IncrementFreq(4);
this.freqData.IncrementSummFreq(4);
int number = this.freqData.SummFreq - state2.Freq;
int num3 = (model.OrderFall != 0) ? 1 : 0;
state2.Freq = Utility.URShift((int) (state2.Freq + num3), 1);
this.freqData.SummFreq = state2.Freq;
do
{
state2.IncrementAddress();
number -= state2.Freq;
state2.Freq = Utility.URShift((int) (state2.Freq + num3), 1);
this.freqData.IncrementSummFreq(state2.Freq);
state3.Address = state2.Address - 6;
if (state2.Freq > state3.Freq)
{
state.Address = state2.Address;
ref2 = new StateRef();
ref2.Values = state;
SharpCompress.Compressor.PPMd.H.State ptr = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
SharpCompress.Compressor.PPMd.H.State state5 = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
do
{
ptr.Address = state.Address - 6;
state.SetValues(ptr);
state.DecrementAddress();
state5.Address = state.Address - 6;
}
while ((state.Address != this.freqData.GetStats()) && (ref2.Freq > state5.Freq));
state.SetValues(ref2);
}
}
while (--num2 != 0);
if (state2.Freq == 0)
{
do
{
num2++;
state2.DecrementAddress();
}
while (state2.Freq == 0);
number += num2;
this.NumStats -= num2;
if (this.NumStats == 1)
{
ref2 = new StateRef();
state3.Address = this.freqData.GetStats();
ref2.Values = state3;
do
{
ref2.DecrementFreq(Utility.URShift(ref2.Freq, 1));
number = Utility.URShift(number, 1);
}
while (number > 1);
model.SubAlloc.freeUnits(this.freqData.GetStats(), Utility.URShift((int) (numStats + 1), 1));
this.oneState.SetValues(ref2);
model.FoundState.Address = this.oneState.Address;
return;
}
}
number -= Utility.URShift(number, 1);
this.freqData.IncrementSummFreq(number);
int oldNU = Utility.URShift((int) (numStats + 1), 1);
int newNU = Utility.URShift((int) (this.NumStats + 1), 1);
if (oldNU != newNU)
{
this.freqData.SetStats(model.SubAlloc.shrinkUnits(this.freqData.GetStats(), oldNU, newNU));
}
model.FoundState.Address = this.freqData.GetStats();
}
internal bool decodeSymbol1(ModelPPM model)
{
int num2;
RangeCoder coder = model.Coder;
coder.SubRange.Scale = this.freqData.SummFreq;
SharpCompress.Compressor.PPMd.H.State state = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
state.Address = this.freqData.GetStats();
long currentCount = coder.CurrentCount;
if (currentCount >= coder.SubRange.Scale)
{
return false;
}
if (currentCount < (num2 = state.Freq))
{
coder.SubRange.HighCount = num2;
model.PrevSuccess = ((2 * num2) > coder.SubRange.Scale) ? 1 : 0;
model.incRunLength(model.PrevSuccess);
num2 += 4;
model.FoundState.Address = state.Address;
model.FoundState.Freq = num2;
this.freqData.IncrementSummFreq(4);
if (num2 > 0x7c)
{
this.rescale(model);
}
coder.SubRange.LowCount = 0L;
return true;
}
if (model.FoundState.Address == 0)
{
return false;
}
model.PrevSuccess = 0;
int numStats = this.NumStats;
int num = numStats - 1;
while ((num2 += state.IncrementAddress().Freq) <= currentCount)
{
if (--num == 0)
{
model.HiBitsFlag = model.getHB2Flag()[model.FoundState.Symbol];
coder.SubRange.LowCount = num2;
model.CharMask[state.Symbol] = model.EscCount;
model.NumMasked = numStats;
num = numStats - 1;
model.FoundState.Address = 0;
do
{
model.CharMask[state.DecrementAddress().Symbol] = model.EscCount;
}
while (--num != 0);
coder.SubRange.HighCount = coder.SubRange.Scale;
return true;
}
}
coder.SubRange.LowCount = num2 - state.Freq;
coder.SubRange.HighCount = num2;
this.update1(model, state.Address);
return true;
}
internal bool decodeSymbol1(ModelPPM model)
{
int num2;
RangeCoder coder = model.Coder;
coder.SubRange.Scale = this.freqData.SummFreq;
SharpCompress.Compressor.PPMd.H.State state = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
state.Address = this.freqData.GetStats();
long currentCount = coder.CurrentCount;
if (currentCount >= coder.SubRange.Scale)
{
return(false);
}
if (currentCount < (num2 = state.Freq))
{
coder.SubRange.HighCount = num2;
model.PrevSuccess = ((2 * num2) > coder.SubRange.Scale) ? 1 : 0;
model.incRunLength(model.PrevSuccess);
num2 += 4;
model.FoundState.Address = state.Address;
model.FoundState.Freq = num2;
this.freqData.IncrementSummFreq(4);
if (num2 > 0x7c)
{
this.rescale(model);
}
coder.SubRange.LowCount = 0L;
return(true);
}
if (model.FoundState.Address == 0)
{
return(false);
}
model.PrevSuccess = 0;
int numStats = this.NumStats;
int num = numStats - 1;
while ((num2 += state.IncrementAddress().Freq) <= currentCount)
{
if (--num == 0)
{
model.HiBitsFlag = model.getHB2Flag()[model.FoundState.Symbol];
coder.SubRange.LowCount = num2;
model.CharMask[state.Symbol] = model.EscCount;
model.NumMasked = numStats;
num = numStats - 1;
model.FoundState.Address = 0;
do
{
model.CharMask[state.DecrementAddress().Symbol] = model.EscCount;
}while (--num != 0);
coder.SubRange.HighCount = coder.SubRange.Scale;
return(true);
}
}
coder.SubRange.LowCount = num2 - state.Freq;
coder.SubRange.HighCount = num2;
this.update1(model, state.Address);
return(true);
}
internal void rescale(ModelPPM model)
{
StateRef ref2;
int numStats = this.NumStats;
int num2 = this.NumStats - 1;
SharpCompress.Compressor.PPMd.H.State state = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
SharpCompress.Compressor.PPMd.H.State state2 = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
SharpCompress.Compressor.PPMd.H.State state3 = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
state2.Address = model.FoundState.Address;
while (state2.Address != this.freqData.GetStats())
{
state3.Address = state2.Address - 6;
SharpCompress.Compressor.PPMd.H.State.PPMDSwap(state2, state3);
state2.DecrementAddress();
}
state3.Address = this.freqData.GetStats();
state3.IncrementFreq(4);
this.freqData.IncrementSummFreq(4);
int number = this.freqData.SummFreq - state2.Freq;
int num3 = (model.OrderFall != 0) ? 1 : 0;
state2.Freq = Utility.URShift((int)(state2.Freq + num3), 1);
this.freqData.SummFreq = state2.Freq;
do
{
state2.IncrementAddress();
number -= state2.Freq;
state2.Freq = Utility.URShift((int)(state2.Freq + num3), 1);
this.freqData.IncrementSummFreq(state2.Freq);
state3.Address = state2.Address - 6;
if (state2.Freq > state3.Freq)
{
state.Address = state2.Address;
ref2 = new StateRef();
ref2.Values = state;
SharpCompress.Compressor.PPMd.H.State ptr = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
SharpCompress.Compressor.PPMd.H.State state5 = new SharpCompress.Compressor.PPMd.H.State(model.Heap);
do
{
ptr.Address = state.Address - 6;
state.SetValues(ptr);
state.DecrementAddress();
state5.Address = state.Address - 6;
}while ((state.Address != this.freqData.GetStats()) && (ref2.Freq > state5.Freq));
state.SetValues(ref2);
}
}while (--num2 != 0);
if (state2.Freq == 0)
{
do
{
num2++;
state2.DecrementAddress();
}while (state2.Freq == 0);
number += num2;
this.NumStats -= num2;
if (this.NumStats == 1)
{
ref2 = new StateRef();
state3.Address = this.freqData.GetStats();
ref2.Values = state3;
do
{
ref2.DecrementFreq(Utility.URShift(ref2.Freq, 1));
number = Utility.URShift(number, 1);
}while (number > 1);
model.SubAlloc.freeUnits(this.freqData.GetStats(), Utility.URShift((int)(numStats + 1), 1));
this.oneState.SetValues(ref2);
model.FoundState.Address = this.oneState.Address;
return;
}
}
number -= Utility.URShift(number, 1);
this.freqData.IncrementSummFreq(number);
int oldNU = Utility.URShift((int)(numStats + 1), 1);
int newNU = Utility.URShift((int)(this.NumStats + 1), 1);
if (oldNU != newNU)
{
this.freqData.SetStats(model.SubAlloc.shrinkUnits(this.freqData.GetStats(), oldNU, newNU));
}
model.FoundState.Address = this.freqData.GetStats();
}
