internal void decodeBinSymbol(ModelPPM model)
{
SharpCompress.Compressor.PPMd.H.State rs = this.tempState1.Initialize(model.Heap);
rs.Address = this.oneState.Address;
model.HiBitsFlag = model.getHB2Flag()[model.FoundState.Symbol];
int index = rs.Freq - 1;
int num2 = this.getArrayIndex(model, rs);
int summ = model.BinSumm[index][num2];
if (model.Coder.GetCurrentShiftCount(ModelPPM.TOT_BITS) < summ)
{
model.FoundState.Address = rs.Address;
rs.IncrementFreq((rs.Freq < 0x80) ? 1 : 0);
model.Coder.SubRange.LowCount = 0L;
model.Coder.SubRange.HighCount = summ;
summ = ((summ + ModelPPM.INTERVAL) - this.getMean(summ, 7, 2)) & 0xffff;
model.BinSumm[index][num2] = summ;
model.PrevSuccess = 1;
model.incRunLength(1);
}
else
{
model.Coder.SubRange.LowCount = summ;
summ = (summ - this.getMean(summ, 7, 2)) & 0xffff;
model.BinSumm[index][num2] = summ;
model.Coder.SubRange.HighCount = ModelPPM.BIN_SCALE;
model.InitEsc = ExpEscape[Utility.URShift(summ, 10)];
model.NumMasked = 1;
model.CharMask[rs.Symbol] = model.EscCount;
model.PrevSuccess = 0;
model.FoundState.Address = 0;
}
}
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;
}
}
}
public int decodeChar(SharpCompress.Compressor.LZMA.RangeCoder.Decoder decoder)
{
SharpCompress.Compressor.PPMd.H.State state;
int num;
int threshold;
int num3;
byte symbol;
if (this.minContext.NumStats != 1)
{
state = this.tempState1.Initialize(this.Heap);
state.Address = this.minContext.FreqData.GetStats();
if ((threshold = (int)decoder.GetThreshold((uint)this.minContext.FreqData.SummFreq)) < (num3 = state.Freq))
{
decoder.Decode(0, (uint)state.Freq);
symbol = (byte)state.Symbol;
this.minContext.update1_0(this, state.Address);
this.nextContext();
return(symbol);
}
this.prevSuccess = 0;
num = this.minContext.NumStats - 1;
do
{
state.IncrementAddress();
if ((num3 += state.Freq) > threshold)
{
decoder.Decode((uint)(num3 - state.Freq), (uint)state.Freq);
symbol = (byte)state.Symbol;
this.minContext.update1(this, state.Address);
this.nextContext();
return(symbol);
}
}while (--num > 0);
if (threshold >= this.minContext.FreqData.SummFreq)
{
return(-2);
}
this.hiBitsFlag = this.HB2Flag[this.foundState.Symbol];
decoder.Decode((uint)num3, (uint)(this.minContext.FreqData.SummFreq - num3));
for (num = 0; num < 0x100; num++)
{
this.charMask[num] = -1;
}
this.charMask[state.Symbol] = 0;
num = this.minContext.NumStats - 1;
do
{
state.DecrementAddress();
this.charMask[state.Symbol] = 0;
}while (--num > 0);
}
else
{
SharpCompress.Compressor.PPMd.H.State rs = this.tempState1.Initialize(this.Heap);
rs.Address = this.minContext.getOneState().Address;
this.hiBitsFlag = this.getHB2Flag()[this.foundState.Symbol];
int index = rs.Freq - 1;
int num6 = this.minContext.getArrayIndex(this, rs);
int summ = this.binSumm[index][num6];
if (decoder.DecodeBit((uint)summ, 14) == 0)
{
this.binSumm[index][num6] = ((summ + INTERVAL) - this.minContext.getMean(summ, 7, 2)) & 0xffff;
this.foundState.Address = rs.Address;
symbol = (byte)rs.Symbol;
rs.IncrementFreq((rs.Freq < 0x80) ? 1 : 0);
this.prevSuccess = 1;
this.incRunLength(1);
this.nextContext();
return(symbol);
}
summ = (summ - this.minContext.getMean(summ, 7, 2)) & 0xffff;
this.binSumm[index][num6] = summ;
this.initEsc = PPMContext.ExpEscape[Utility.URShift(summ, 10)];
for (num = 0; num < 0x100; num++)
{
this.charMask[num] = -1;
}
this.charMask[rs.Symbol] = 0;
this.prevSuccess = 0;
}
while (true)
{
int num8;
state = this.tempState1.Initialize(this.Heap);
int numStats = this.minContext.NumStats;
do
{
this.orderFall++;
this.minContext.Address = this.minContext.getSuffix();
if ((this.minContext.Address <= this.subAlloc.PText) || (this.minContext.Address > this.subAlloc.HeapEnd))
{
return(-1);
}
}while (this.minContext.NumStats == numStats);
num3 = 0;
state.Address = this.minContext.FreqData.GetStats();
num = 0;
int num9 = this.minContext.NumStats - numStats;
do
{
int num11 = this.charMask[state.Symbol];
num3 += state.Freq & num11;
this.minContext.ps[num] = state.Address;
state.IncrementAddress();
num -= num11;
}while (num != num9);
SEE2Context context = this.minContext.makeEscFreq(this, numStats, out num8);
num8 += num3;
threshold = (int)decoder.GetThreshold((uint)num8);
if (threshold < num3)
{
SharpCompress.Compressor.PPMd.H.State state3 = this.tempState2.Initialize(this.Heap);
num3 = 0;
num = 0;
state3.Address = this.minContext.ps[num];
while ((num3 += state3.Freq) <= threshold)
{
num++;
state3.Address = this.minContext.ps[num];
}
state.Address = state3.Address;
decoder.Decode((uint)(num3 - state.Freq), (uint)state.Freq);
context.update();
symbol = (byte)state.Symbol;
this.minContext.update2(this, state.Address);
this.updateModel();
return(symbol);
}
if (threshold >= num8)
{
return(-2);
}
decoder.Decode((uint)num3, (uint)(num8 - num3));
context.Summ += num8;
do
{
state.Address = this.minContext.ps[--num];
this.charMask[state.Symbol] = 0;
}while (num != 0);
}
}
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 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();
}