private DicomReadStatus ParseTag(DicomTag stopAtTag, DicomReadOptions options)
{
if (_tag == null)
{
if (_remain >= 4)
{
_pos = _stream.Position + _offset;
ushort g = _reader.ReadUInt16();
if (Flags.IsSet(options, DicomReadOptions.FileMetaInfoOnly) && g != 0x0002)
{
_stream.Seek(-2, SeekOrigin.Current);
return(DicomReadStatus.SuccessEndRead);
}
ushort e = _reader.ReadUInt16();
if (DicomTag.IsPrivateGroup(g) && e > 0x00ff)
{
uint card = DicomTag.GetCard(g, e);
if ((card & 0xffffff00) != _privateCreatorCard)
{
_privateCreatorCard = card & 0xffffff00;
DicomTag pct = DicomTag.GetPrivateCreatorTag(g, e);
DcmDataset ds = _dataset;
if (_sds.Count > 0 && _sds.Count == _sqs.Count)
{
ds = _sds.Peek();
if (!ds.Contains(pct))
{
ds = _dataset;
}
}
_privateCreatorId = ds.GetString(pct, String.Empty);
}
_tag = new DicomTag(g, e, _privateCreatorId);
}
else
{
_tag = new DicomTag(g, e);
if (g == 0xfffe)
{
if (_tag == DicomTags.Item ||
_tag == DicomTags.ItemDelimitationItem ||
_tag == DicomTags.SequenceDelimitationItem)
{
_vr = DicomVR.NONE;
}
}
}
_remain -= 4;
_bytes += 4;
_read += 4;
}
else
{
return(NeedMoreData(4));
}
}
if (_tag == DicomTags.ItemDelimitationItem && Flags.IsSet(options, DicomReadOptions.SequenceItemOnly))
{
return(DicomReadStatus.SuccessEndRead);
}
if (_tag >= stopAtTag)
{
return(DicomReadStatus.SuccessEndRead);
}
return(DicomReadStatus.Success);
}