internal bool decodeSymbol2(ModelPPM model)
{
long count;
int hiCnt, i = NumStats - model.NumMasked;
SEE2Context psee2c = makeEscFreq2(model, i);
RangeCoder coder = model.Coder;
// STATE* ps[256], ** pps=ps, * p=U.Stats-1;
State p = tempState1.Initialize(model.Heap);
State temp = tempState2.Initialize(model.Heap);
p.Address = freqData.GetStats() - State.Size;
int pps = 0;
hiCnt = 0;
do
{
do
{
p.IncrementAddress(); // p++;
} while (model.CharMask[p.Symbol] == model.EscCount);
hiCnt += p.Freq;
ps[pps++] = p.Address;
} while (--i != 0);
coder.SubRange.incScale(hiCnt);
count = coder.CurrentCount;
if (count >= coder.SubRange.Scale)
{
return(false);
}
pps = 0;
p.Address = ps[pps];
if (count < hiCnt)
{
hiCnt = 0;
while ((hiCnt += p.Freq) <= count)
{
p.Address = ps[++pps]; // p=*++pps;
}
coder.SubRange.HighCount = hiCnt;
coder.SubRange.LowCount = hiCnt - p.Freq;
psee2c.update();
update2(model, p.Address);
}
else
{
coder.SubRange.LowCount = hiCnt;
coder.SubRange.HighCount = coder.SubRange.Scale;
i = NumStats - model.NumMasked; // ->NumMasked;
pps--;
do
{
temp.Address = ps[++pps]; // (*++pps)
model.CharMask[temp.Symbol] = model.EscCount;
} while (--i != 0);
psee2c.incSumm((int)coder.SubRange.Scale);
model.NumMasked = NumStats;
}
return(true);
}
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);
}