internal int DecodeBlock(Stream source, byte[] buffer, int offset, int count)
{
if (minimumContext == PpmContext.Zero)
{
return(0);
}
int total = 0;
while (total < count)
{
if (numberStatistics != 0)
{
DecodeSymbol1(minimumContext);
}
else
{
DecodeBinarySymbol(minimumContext);
}
Coder.RangeRemoveSubrange();
while (foundState == PpmState.Zero)
{
Coder.RangeDecoderNormalize(source);
do
{
orderFall++;
minimumContext = minimumContext.Suffix;
if (minimumContext == PpmContext.Zero)
{
goto StopDecoding;
}
} while (minimumContext.NumberStatistics == numberMasked);
DecodeSymbol2(minimumContext);
Coder.RangeRemoveSubrange();
}
buffer[offset] = foundState.Symbol;
offset++;
total++;
if (orderFall == 0 && (Pointer)foundState.Successor >= Allocator.BaseUnit)
{
maximumContext = foundState.Successor;
}
else
{
UpdateModel(minimumContext);
if (escapeCount == 0)
{
ClearMask();
}
}
minimumContext = maximumContext;
numberStatistics = minimumContext.NumberStatistics;
Coder.RangeDecoderNormalize(source);
}
StopDecoding:
return(total);
}
