private bool ParseItemSequenceValue(IByteSource source)
{
if (_parseStage == ParseStage.Value)
{
if (_length != _undefinedLength)
{
if (!source.Require(_length))
{
_result = DicomReaderResult.Suspended;
return(false);
}
source.PushMilestone(_length);
}
_observer.OnBeginSequenceItem(source, _length);
ResetState();
++_sequenceDepth;
ParseDataset(source);
--_sequenceDepth;
// bugfix k-pacs. there a sequence was not ended by ItemDelimitationItem>SequenceDelimitationItem, but directly with SequenceDelimitationItem
bool isEndSequence = (_tag == DicomTag.SequenceDelimitationItem);
ResetState();
_observer.OnEndSequenceItem();
if (isEndSequence)
{
// end of sequence
_observer.OnEndSequence();
// #565 Only reset the badPrivate sequence if we're in the correct depth
// This prevents prematurely resetting in case of sub-sequences contained in the bad private sequence
if (_badPrivateSequence && _sequenceDepth == _badPrivateSequenceDepth)
{
_isExplicitVR = !_isExplicitVR;
_badPrivateSequence = false;
}
ResetState();
return(false);
}
}
return(true);
}
private void ParseItemSequence(IByteSource source, object state)
{
try {
_result = DicomReaderResult.Processing;
while (!source.IsEOF && !source.HasReachedMilestone())
{
if (_state == ParseState.Tag)
{
source.Mark();
if (!source.Require(8, ParseItemSequence, state))
{
_result = DicomReaderResult.Suspended;
return;
}
ushort group = source.GetUInt16();
ushort element = source.GetUInt16();
_tag = new DicomTag(group, element);
if (_tag != DicomTag.Item && _tag != DicomTag.SequenceDelimitationItem)
{
// assume invalid sequence
source.Rewind();
if (!_implicit)
{
source.PopMilestone();
}
_observer.OnEndSequence();
if (_badPrivateSequence)
{
_explicit = !_explicit;
_badPrivateSequence = false;
}
return;
}
_length = source.GetUInt32();
if (_tag == DicomTag.SequenceDelimitationItem)
{
// end of sequence
_observer.OnEndSequence();
if (_badPrivateSequence)
{
_explicit = !_explicit;
_badPrivateSequence = false;
}
ResetState();
return;
}
_state = ParseState.Value;
}
if (_state == ParseState.Value)
{
if (_length != UndefinedLength)
{
if (!source.Require(_length, ParseItemSequence, state))
{
_result = DicomReaderResult.Suspended;
return;
}
source.PushMilestone(_length);
}
_observer.OnBeginSequenceItem(source, _length);
ResetState();
ParseDataset(source, state);
ResetState();
_observer.OnEndSequenceItem();
continue;
}
}
// end of explicit length sequence
if (source.HasReachedMilestone())
{
source.PopMilestone();
}
_observer.OnEndSequence();
if (_badPrivateSequence)
{
_explicit = !_explicit;
_badPrivateSequence = false;
}
} catch (Exception e) {
_exception = e;
_result = DicomReaderResult.Error;
} finally {
if (_result != DicomReaderResult.Processing && _result != DicomReaderResult.Suspended)
{
_async.Set();
}
}
}
