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);
}
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);
}