public void Decode(IBinaryReader reader)
{
if (_YDecoder == null)
{
_CSlices = _CSerial = 0;
_YMap = null;
}
byte serial = reader.ReadByte();
byte slices = reader.ReadByte();
if (serial != _CSerial)
{
throw new DjvuFormatException(
$"{nameof(IInterWavePixelMap)} received out of order data. Expected serial number {_CSerial}, actual {serial}");
}
int nslices = _CSlices + slices;
if (_CSerial == 0)
{
int major = reader.ReadByte();
int minor = reader.ReadByte();
if ((major & 0x7f) != InterWaveCodec.MajorVersion)
{
throw new DjvuFormatException("File has been compressed with an incompatible codec");
}
if (minor > InterWaveCodec.MinorVersion)
{
throw new DjvuFormatException("File has been compressed with a more recent codec");
}
int w = (reader.ReadByte() << 8);
w |= reader.ReadByte();
int h = (reader.ReadByte() << 8);
h |= reader.ReadByte();
int crcbDelay = 0;
if ((major & 0x7f) == 1 && minor >= 2)
{
crcbDelay = reader.ReadByte();
if (minor >= 2)
{
_CrCbDelay = (crcbDelay & 0x7f);
}
}
if (minor >= 2)
{
_CrCbHalf = ((crcbDelay & 0x80) != 0 ? false : true);
}
if ((major & 0x80) != 0)
{
_CrCbDelay = -1;
}
_YMap = new InterWaveMap(w, h);
_YDecoder = new InterWaveDecoder(_YMap);
if (_CrCbDelay >= 0)
{
_CbMap = new InterWaveMap(w, h);
_CrMap = new InterWaveMap(w, h);
_CbDecoder = new InterWaveDecoder(_CbMap);
_CrDecoder = new InterWaveDecoder(_CrMap);
}
}
IDataCoder coder = DjvuSettings.Current.CoderFactory.CreateCoder(reader.BaseStream, false);
for (int flag = 1; flag != 0 && _CSlices < nslices; _CSlices++)
{
flag = _YDecoder.CodeSlice(coder);
if (_CrDecoder != null && _CbDecoder != null && _CrCbDelay <= _CSlices)
{
flag |= _CbDecoder.CodeSlice(coder);
flag |= _CrDecoder.CodeSlice(coder);
}
}
_CSerial++;
}
public void CloseCodec()
{
_YDecoder = _CrDecoder = _CbDecoder = null;
Close();
}