public void OnBeginSequence(IByteSource source, DicomTag tag, uint length)
{
_currentSequenceTag.Push(tag);
if (tag == DicomTag.DirectoryRecordSequence) {
_directoryRecordSequence = _dataset.Get<DicomSequence>(tag);
}
}
public void OnBeginSequence(IByteSource source, DicomTag tag, uint length) {
DicomSequence sq = new DicomSequence(tag);
_sequences.Push(sq);
DicomDataset ds = _datasets.Peek();
ds.Add(sq);
}
public void OnBeginSequenceItem(IByteSource source, uint length)
{
if (_currentSequenceTag.Peek() == DicomTag.DirectoryRecordSequence && _directoryRecordSequence != null)
{
_lookup.Add((uint)source.Position - 8, _directoryRecordSequence.LastOrDefault());
}
}
public void OnBeginSequenceItem(IByteSource source, uint length) {
DicomSequence sq = _sequences.Peek();
DicomDataset item = new DicomDataset();
sq.Items.Add(item);
_datasets.Push(item);
}
public IAsyncResult BeginRead(IByteSource source, IDicomReaderObserver fileMetaInfo, IDicomReaderObserver dataset, AsyncCallback callback, object state) {
_result = DicomReaderResult.Processing;
_source = source;
_fmiObserver = fileMetaInfo;
_dataObserver = dataset;
_async = new EventAsyncResult(callback, state);
ParsePreamble(source, null); // ThreadPool?
return _async;
}
public IAsyncResult BeginRead(IByteSource source, IDicomReaderObserver observer, DicomTag stop, AsyncCallback callback, object state) {
_stop = stop;
_observer = observer;
_result = DicomReaderResult.Processing;
_exception = null;
_async = new EventAsyncResult(callback, state);
ThreadPool.QueueUserWorkItem(ParseProc, source);
return _async;
}
public IAsyncResult BeginRead(IByteSource source, IDicomReaderObserver fileMetaInfo, IDicomReaderObserver dataset, AsyncCallback callback, object state)
{
_result = DicomReaderResult.Processing;
_source = source;
_fmiObserver = fileMetaInfo;
_dataObserver = dataset;
_async = new EventAsyncResult(callback, state);
ParsePreamble(source, null); // ThreadPool?
return(_async);
}
public IAsyncResult BeginRead(IByteSource source, IDicomReaderObserver observer, DicomTag stop, AsyncCallback callback, object state)
{
_stop = stop;
_observer = observer;
_result = DicomReaderResult.Processing;
_exception = null;
_async = new EventAsyncResult(callback, state);
ThreadPool.QueueUserWorkItem(ParseProc, source);
return(_async);
}
public void OnBeginSequence(IByteSource source, DicomTag tag, uint length)
{
DicomSequence sq = new DicomSequence(tag);
_sequences.Push(sq);
DicomDataset ds = _datasets.Peek();
ds.AddOrUpdate(sq);
}
public static IAsyncResult BeginRead(
this DicomFileReader @this,
IByteSource source,
IDicomReaderObserver fileMetaInfo,
IDicomReaderObserver dataset,
AsyncCallback callback,
object state)
{
return AsyncFactory.ToBegin(@this.ReadAsync(source, fileMetaInfo, dataset), callback, state);
}
public static IAsyncResult BeginRead(
this DicomReader @this,
IByteSource source,
IDicomReaderObserver observer,
Func<ParseState, bool> stop,
AsyncCallback callback,
object state)
{
return AsyncFactory.ToBegin(@this.ReadAsync(source, observer, stop), callback, state);
}
public void OnBeginSequenceItem(IByteSource source, uint length)
{
DicomSequence sq = _sequences.Peek();
DicomDataset item = new DicomDataset();
sq.Items.Add(item);
_datasets.Push(item);
}
public void OnElement(IByteSource source, DicomTag tag, DicomVR vr, IByteBuffer data)
{
DicomElement element = vr.Code switch
{
"AE" => new DicomApplicationEntity(tag, data),
"AS" => new DicomAgeString(tag, data),
"AT" => new DicomAttributeTag(tag, data),
"CS" => new DicomCodeString(tag, data),
"DA" => new DicomDate(tag, data),
"DS" => new DicomDecimalString(tag, data),
"DT" => new DicomDateTime(tag, data),
"FD" => new DicomFloatingPointDouble(tag, data),
"FL" => new DicomFloatingPointSingle(tag, data),
"IS" => new DicomIntegerString(tag, data),
"LO" => new DicomLongString(tag, _encodings.Peek(), data),
"LT" => new DicomLongText(tag, _encodings.Peek(), data),
"OB" => new DicomOtherByte(tag, data),
"OD" => new DicomOtherDouble(tag, data),
"OF" => new DicomOtherFloat(tag, data),
"OL" => new DicomOtherLong(tag, data),
"OV" => new DicomOtherVeryLong(tag, data),
"OW" => new DicomOtherWord(tag, data),
"PN" => new DicomPersonName(tag, _encodings.Peek(), data),
"SH" => new DicomShortString(tag, _encodings.Peek(), data),
"SL" => new DicomSignedLong(tag, data),
"SS" => new DicomSignedShort(tag, data),
"ST" => new DicomShortText(tag, _encodings.Peek(), data),
"SV" => new DicomSignedVeryLong(tag, data),
"TM" => new DicomTime(tag, data),
"UC" => new DicomUnlimitedCharacters(tag, _encodings.Peek(), data),
"UI" => new DicomUniqueIdentifier(tag, data),
"UL" => new DicomUnsignedLong(tag, data),
"UN" => new DicomUnknown(tag, data),
"UR" => new DicomUniversalResource(tag, _encodings.Peek(), data),
"US" => new DicomUnsignedShort(tag, data),
"UT" => new DicomUnlimitedText(tag, _encodings.Peek(), data),
"UV" => new DicomUnsignedVeryLong(tag, data),
_ => throw new DicomDataException($"Unhandled VR in DICOM parser observer: {vr.Code}"),
};
if (element.Tag == DicomTag.SpecificCharacterSet)
{
Encoding[] encodings = _encodings.Peek();
if (element.Count > 0)
{
encodings = DicomEncoding.GetEncodings(element.Get <string[]>(0));
}
_encodings.Pop();
_encodings.Push(encodings);
}
DicomDataset ds = _datasets.Peek();
ds.AddOrUpdate(element);
}
private bool ParseTag(IByteSource source)
{
if (_parseStage == ParseStage.Tag)
{
source.Mark();
if (!source.Require(4))
{
_result = DicomReaderResult.Suspended;
return(false);
}
var group = source.GetUInt16();
var element = source.GetUInt16();
DicomPrivateCreator creator = null;
// according to
// http://dicom.nema.org/medical/dicom/current/output/chtml/part05/sect_7.8.html
// The requirements of this section do not allow any use of elements in the ranges
// (gggg,0001-000F) and (gggg,0100-0FFF) where gggg is odd.
// So element at [0x0100-0x0FFF] should not has a creator
if (@group.IsOdd() && element >= 0x1000)
{
var card = (uint)(@group << 16) + (uint)(element >> 8);
lock (_locker)
{
if (_private.TryGetValue(card, out string pvt))
{
creator = _dictionary.GetPrivateCreator(pvt);
}
}
}
_tag = new DicomTag(@group, element, creator);
_entry = _dictionary[_tag];
if (!_tag.IsPrivate && _entry != null && _entry.MaskTag == null)
{
_tag = _entry.Tag; // Use dictionary tag
}
if (_stop != null &&
_stop(new ParseState {
Tag = _tag, SequenceDepth = _sequenceDepth
}))
{
_result = DicomReaderResult.Stopped;
return(false);
}
_parseStage = ParseStage.VR;
}
return(true);
}
public void OnBeginFragmentSequence(IByteSource source, DicomTag tag, DicomVR vr)
{
if (vr == DicomVR.OB)
_fragment = new DicomOtherByteFragment(tag);
else if (vr == DicomVR.OW)
_fragment = new DicomOtherWordFragment(tag);
else
throw new DicomDataException("Unexpected VR found for DICOM fragment sequence: {0}", vr.Code);
DicomDataset ds = _datasets.Peek();
ds.Add(_fragment);
}
public void OnBeginFragmentSequence(IByteSource source, DicomTag tag, DicomVR vr)
{
_log.Log(
_level,
"{marker:x8}: {padding}{tag} {vrCode} {tagDictionaryEntryName}",
source.Marker,
_pad,
tag,
vr.Code,
tag.DictionaryEntry.Name);
IncreaseDepth();
}
public void OnBeginSequence(IByteSource source, DicomTag tag, uint length)
{
_log.Log(
_level,
"{marker:x8}: {padding}{tag} SQ {length}",
source.Marker,
_pad,
tag,
tag.DictionaryEntry.Name,
length);
IncreaseDepth();
}
public void OnElement(IByteSource source, DicomTag tag, DicomVR vr, IByteBuffer data)
{
_log.Log(
_level,
"{marker:x8}: {padding}{tag} {vrCode} {tagDictionaryEntryName} [{size}]",
source.Marker,
_pad,
tag,
vr.Code,
tag.DictionaryEntry.Name,
data.Size);
}
public void OnBeginSequence(IByteSource source, DicomTag tag, uint length)
{
_log.Log(
_level,
"{marker:x8}: {padding}{tag} SQ {length}",
source.Marker,
_pad,
tag,
tag.DictionaryEntry.Name,
length);
IncreaseDepth();
}
public void OnElement(IByteSource source, DicomTag tag, DicomVR vr, IByteBuffer data)
{
_log.Log(
_level,
"{marker:x8}: {padding}{tag} {vrCode} {tagDictionaryEntryName} [{size}]",
source.Marker,
_pad,
tag,
vr.Code,
tag.DictionaryEntry.Name,
data.Size);
}
public void OnBeginFragmentSequence(IByteSource source, DicomTag tag, DicomVR vr)
{
_log.Log(
_level,
"{marker:x8}: {padding}{tag} {vrCode} {tagDictionaryEntryName}",
source.Marker,
_pad,
tag,
vr.Code,
tag.DictionaryEntry.Name);
IncreaseDepth();
}
public void OnFragmentSequenceItem(IByteSource source, IByteBuffer data)
{
if (data == null)
{
// if a null-buffer is added, then the FragmentSequence is not complete and shall not be added to the DicomDataset
_fragment = null;
}
else
{
_fragment?.Add(data);
}
}
public bool Equals(Object o)
{
if (o == this)
{
return(true);
}
if (o instanceof IByteSource)
{
IByteSource bs = (IByteSource)o;
return(Arrays.equals(getBytes(), bs.getBytes()));
}
return(false);
}
/// <summary>
/// Asynchronously read the byte source.
/// </summary>
/// <param name="source">Byte source to read.</param>
/// <returns>Awaitable read result.</returns>
internal async Task <DicomReaderResult> DoWorkAsync(IByteSource source)
{
ResetState();
source = ConvertSource(source);
await ParseDatasetAsync(source).ConfigureAwait(false);
if (_tag == DicomTag.SequenceDelimitationItem && _result == DicomReaderResult.Processing && source.IsEOF)
{
_result = DicomReaderResult.Success;
}
return(_result);
}
/// <summary>
/// Read the byte source.
/// </summary>
/// <param name="source">Byte source to read.</param>
/// <returns>Read result.</returns>
internal DicomReaderResult DoWork(IByteSource source)
{
ResetState();
source = ConvertSource(source);
ParseDataset(source);
if (_tag == DicomTag.SequenceDelimitationItem && _result == DicomReaderResult.Processing && source.IsEOF)
{
_result = DicomReaderResult.Success;
}
return(_result);
}
private bool ParseTag(IByteSource source)
{
if (this.parseStage == ParseStage.Tag)
{
source.Mark();
if (!source.Require(4))
{
this.result = DicomReaderResult.Suspended;
return(false);
}
var group = source.GetUInt16();
var element = source.GetUInt16();
DicomPrivateCreator creator = null;
if (@group.IsOdd() && element > 0x00ff)
{
var card = (uint)(@group << 16) + (uint)(element >> 8);
lock (this.locker)
{
string pvt;
if (this._private.TryGetValue(card, out pvt))
{
creator = this.dictionary.GetPrivateCreator(pvt);
}
}
}
this._tag = new DicomTag(@group, element, creator);
this._entry = this.dictionary[this._tag];
if (!this._tag.IsPrivate && this._entry != null && this._entry.MaskTag == null)
{
this._tag = this._entry.Tag; // Use dictionary tag
}
if (this.stop != null &&
this.stop(new ParseState {
Tag = this._tag, SequenceDepth = this.sequenceDepth
}))
{
this.result = DicomReaderResult.Stopped;
return(false);
}
this.parseStage = ParseStage.VR;
}
return(true);
}
private static bool IsPrivateSequenceBad(IByteSource source, uint count, bool isExplicitVR)
{
source.Mark();
try
{
// Skip "item" tags; continue skipping until length is non-zero (#223)
// Using & instead of && enforces RHS to be evaluated regardless of LHS
uint length;
while (source.GetUInt16() == DicomTag.Item.Group &
source.GetUInt16() == DicomTag.Item.Element &
(length = source.GetUInt32()) < uint.MaxValue) // Dummy condition to ensure that length is included in parsing
{
// Length non-zero, end skipping (#223)
if (length > 0)
{
break;
}
// Handle scenario where last tag is private sequence with empty items (#487)
count -= 8;
if (count <= 0)
{
return(false);
}
}
source.GetUInt16(); // group
source.GetUInt16(); // element
var bytes = source.GetBytes(2);
var vr = Encoding.UTF8.GetString(bytes, 0, bytes.Length);
DicomVR dummy;
if (DicomVR.TryParse(vr, out dummy))
{
return(!isExplicitVR);
}
// unable to parse VR
if (isExplicitVR)
{
return(true);
}
}
finally
{
source.Rewind();
}
return(false);
}
private IByteSource Decompress(IByteSource source)
{
var compressed = source.GetStream();
var decompressed = new MemoryStream();
using (var decompressor = new DeflateStream(compressed, CompressionMode.Decompress, true))
{
decompressor.CopyTo(decompressed);
}
decompressed.Seek(0, SeekOrigin.Begin);
return(new StreamByteSource(decompressed));
}
/// <summary>
/// Read DICOM file object.
/// </summary>
/// <param name="source">Byte source to read.</param>
/// <param name="fileMetaInfo">Reader observer for file meta information.</param>
/// <param name="dataset">Reader observer for dataset.</param>
/// <param name="stop">Stop criterion in dataset.</param>
/// <returns>Reader result.</returns>
public DicomReaderResult Read(
IByteSource source,
IDicomReaderObserver fileMetaInfo,
IDicomReaderObserver dataset,
Func<ParseState, bool> stop = null)
{
var parse = Parse(source, fileMetaInfo, dataset, stop);
lock (this.locker)
{
this.fileFormat = parse.Item2;
this.syntax = parse.Item3;
}
return parse.Item1;
}
public override void Close()
{
try
{
if (sourceOrDestination != null)
{
if (consumer != null && !inconsistentState)
{
Flush();
}
}
if (producer != null && producer is IDisposable)
{
((IDisposable)producer).Dispose();
}
if (consumer != null && consumer is IDisposable)
{
((IDisposable)consumer).Dispose();
}
}
finally
{
if (sourceOrDestination != null)
{
if (sourceOrDestination is Stream)
{
((Stream)sourceOrDestination).Close();
}
else if (sourceOrDestination is TextReader)
{
((TextReader)sourceOrDestination).Close();
}
else
{
((TextWriter)sourceOrDestination).Close();
}
}
sourceOrDestination = null;
consumer = null;
producer = null;
chunkToReadBuffer = null;
writeBuffer = null;
byteSource = null;
}
}
public void OnBeginFragmentSequence(IByteSource source, DicomTag tag, DicomVR vr)
{
if (vr == DicomVR.OB)
{
_fragment = new DicomOtherByteFragment(tag);
}
else if (vr == DicomVR.OW)
{
_fragment = new DicomOtherWordFragment(tag);
}
else
{
throw new DicomDataException($"Unexpected VR found for DICOM fragment sequence: {vr.Code}");
}
}
private void ParseItemSequencePostProcess(IByteSource source)
{
// end of explicit length sequence
if (source.HasReachedMilestone())
{
source.PopMilestone();
}
this.observer.OnEndSequence();
if (this.badPrivateSequence)
{
this.isExplicitVR = !this.isExplicitVR;
this.badPrivateSequence = false;
}
}
/// <summary>
/// Asynchronously read DICOM file object.
/// </summary>
/// <param name="source">Byte source to read.</param>
/// <param name="fileMetaInfo">Reader observer for file meta information.</param>
/// <param name="dataset">Reader observer for dataset.</param>
/// <param name="stop">Stop criterion in dataset.</param>
/// <returns>Awaitable reader result.</returns>
public async Task <DicomReaderResult> ReadAsync(
IByteSource source,
IDicomReaderObserver fileMetaInfo,
IDicomReaderObserver dataset,
Func <ParseState, bool> stop = null)
{
var parse = await ParseAsync(source, fileMetaInfo, dataset, stop).ConfigureAwait(false);
lock (_locker)
{
FileFormat = parse.Item2;
Syntax = parse.Item3;
}
return(parse.Item1);
}
/// <summary>
/// Read DICOM file object.
/// </summary>
/// <param name="source">Byte source to read.</param>
/// <param name="fileMetaInfo">Reader observer for file meta information.</param>
/// <param name="dataset">Reader observer for dataset.</param>
/// <param name="stop">Stop criterion in dataset.</param>
/// <returns>Reader result.</returns>
public DicomReaderResult Read(
IByteSource source,
IDicomReaderObserver fileMetaInfo,
IDicomReaderObserver dataset,
Func <ParseState, bool> stop = null)
{
var parse = Parse(source, fileMetaInfo, dataset, stop);
lock (this.locker)
{
this.fileFormat = parse.Item2;
this.syntax = parse.Item3;
}
return(parse.Item1);
}
public void OnBeginSequenceItem(IByteSource source, uint length)
{
DicomSequence sq = _sequences.Peek();
DicomDataset item = new DicomDataset().NotValidated();
sq.Items.Add(item);
_datasets.Push(item);
var encoding = _encodings.Peek();
item.SetFallbackEncodings(encoding);
_encodings.Push(encoding);
}
private void ParseDataset(IByteSource source)
{
if (this.isDeflated)
{
#if NET35
throw new NotSupportedException("Deflated datasets not supported in Unity.");
#else
source = this.Decompress(source);
#endif
}
this.result = DicomReaderResult.Processing;
while (!source.IsEOF && !source.HasReachedMilestone() && this.result == DicomReaderResult.Processing)
{
if (!this.ParseTag(source))
{
return;
}
if (!this.ParseVR(source))
{
return;
}
if (!this.ParseLength(source))
{
return;
}
if (!this.ParseValue(source))
{
return;
}
}
if (source.HasReachedMilestone())
{
// end of explicit length sequence item
source.PopMilestone();
return;
}
if (this.result != DicomReaderResult.Processing)
{
return;
}
// end of processing
this.result = DicomReaderResult.Success;
}
/// <summary>
/// Closes the current stream and releases any resources (such as sockets and file handles) associated with the current stream.
/// </summary>
public override void Close()
{
try
{
if (this.sourceOrDestination != null)
{
if (this.consumer != null && !this.inconsistentState)
{
this.Flush();
}
}
if (this.producer != null && this.producer is IDisposable)
{
((IDisposable)this.producer).Dispose();
}
if (this.consumer != null && this.consumer is IDisposable)
{
((IDisposable)this.consumer).Dispose();
}
}
finally
{
if (this.sourceOrDestination != null)
{
if (this.sourceOrDestination is Stream stream)
{
stream.Close();
}
else if (this.sourceOrDestination is TextReader textReader)
{
textReader.Close();
}
else if (this.sourceOrDestination is TextWriter textWriter)
{
textWriter.Close();
}
}
this.sourceOrDestination = null;
this.consumer = null;
this.producer = null;
this.chunkToReadBuffer = null;
this.writeBuffer = null;
this.byteSource = null;
}
}
/// <summary>
/// Read DICOM file object.
/// </summary>
/// <param name="source">Byte source to read.</param>
/// <param name="fileMetaInfo">Reader observer for file meta information.</param>
/// <param name="dataset">Reader observer for dataset.</param>
/// <param name="stop">Stop criterion in dataset.</param>
/// <returns>Reader result.</returns>
public DicomReaderResult Read(
IByteSource source,
IDicomReaderObserver fileMetaInfo,
IDicomReaderObserver dataset,
Func <ParseState, bool> stop = null)
{
var parse = Parse(source, fileMetaInfo, dataset, stop);
lock (_locker)
{
FileFormat = parse.Format;
Syntax = parse.Syntax;
}
return(parse.Result);
}
private async Task ParseFragmentSequenceAsync(IByteSource source)
{
_result = DicomReaderResult.Processing;
while (!source.IsEOF)
{
if (!ParseFragmentSequenceTag(source))
{
return;
}
if (!await ParseFragmentSequenceValueAsync(source).ConfigureAwait(false))
{
return;
}
}
}
private void ParseFragmentSequence(IByteSource source)
{
_result = DicomReaderResult.Processing;
while (!source.IsEOF)
{
if (!ParseFragmentSequenceTag(source))
{
return;
}
if (!ParseFragmentSequenceValue(source))
{
return;
}
}
}
public void OnElement(IByteSource source, DicomTag tag, DicomVR vr, IByteBuffer data) {
DicomElement element;
switch (vr.Code) {
case "AE": element = new DicomApplicationEntity(tag, data); break;
case "AS": element = new DicomAgeString(tag, data); break;
case "AT": element = new DicomAttributeTag(tag, data); break;
case "CS": element = new DicomCodeString(tag, data); break;
case "DA": element = new DicomDate(tag, data); break;
case "DS": element = new DicomDecimalString(tag, data); break;
case "DT": element = new DicomDateTime(tag, data); break;
case "FD": element = new DicomFloatingPointDouble(tag, data); break;
case "FL": element = new DicomFloatingPointSingle(tag, data); break;
case "IS": element = new DicomIntegerString(tag, data); break;
case "LO": element = new DicomLongString(tag, _encodings.Peek(), data); break;
case "LT": element = new DicomLongText(tag, _encodings.Peek(), data); break;
case "OB": element = new DicomOtherByte(tag, data); break;
case "OD": element = new DicomOtherDouble(tag, data); break;
case "OF": element = new DicomOtherFloat(tag, data); break;
case "OW": element = new DicomOtherWord(tag, data); break;
case "PN": element = new DicomPersonName(tag, _encodings.Peek(), data); break;
case "SH": element = new DicomShortString(tag, _encodings.Peek(), data); break;
case "SL": element = new DicomSignedLong(tag, data); break;
case "SS": element = new DicomSignedShort(tag, data); break;
case "ST": element = new DicomShortText(tag, _encodings.Peek(), data); break;
case "TM": element = new DicomTime(tag, data); break;
case "UC": element = new DicomUnlimitedCharacters(tag, _encodings.Peek(), data); break;
case "UI": element = new DicomUniqueIdentifier(tag, data); break;
case "UL": element = new DicomUnsignedLong(tag, data); break;
case "UN": element = new DicomUnknown(tag, data); break;
case "UR": element = new DicomUniversalResource(tag, _encodings.Peek(), data); break;
case "US": element = new DicomUnsignedShort(tag, data); break;
case "UT": element = new DicomUnlimitedText(tag, _encodings.Peek(), data); break;
default:
throw new DicomDataException("Unhandled VR in DICOM parser observer: {0}", vr.Code);
}
if (element.Tag == DicomTag.SpecificCharacterSet) {
Encoding encoding = _encodings.Peek();
if (element.Count > 0)
encoding = DicomEncoding.GetEncoding(element.Get<string>(0));
_encodings.Pop();
_encodings.Push(encoding);
}
DicomDataset ds = _datasets.Peek();
ds.Add(element);
}
private void ParseItemSequencePostProcess(IByteSource source)
{
// end of explicit length sequence
if (source.HasReachedMilestone())
{
source.PopMilestone();
}
_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;
}
}
private async Task <bool> ParseItemSequenceValueAsync(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;
await ParseDatasetAsync(source).ConfigureAwait(false);
--_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 async Task ParseItemSequenceAsync(IByteSource source)
{
_result = DicomReaderResult.Processing;
while (!source.IsEOF && !source.HasReachedMilestone())
{
if (!ParseItemSequenceTag(source))
{
return;
}
if (!await ParseItemSequenceValueAsync(source).ConfigureAwait(false))
{
return;
}
}
ParseItemSequencePostProcess(source);
}
public DicomReaderResult Read(IByteSource source, IDicomReaderObserver observer, DicomTag stop = null) {
return EndRead(BeginRead(source, observer, stop, null, null));
}
private bool IsPrivateSequenceBad(IByteSource source) {
source.Mark();
try {
var group = source.GetUInt16();
var element = source.GetUInt16();
var tag = new DicomTag(group, element);
var length = source.GetUInt32();
group = source.GetUInt16();
element = source.GetUInt16();
tag = new DicomTag(group, element);
byte[] bytes = source.GetBytes(2);
string vr = Encoding.UTF8.GetString(bytes, 0, bytes.Length);
try {
DicomVR.Parse(vr);
return !_explicit;
} catch {
// unable to parse VR
if (_explicit)
return true;
}
} finally {
source.Rewind();
}
return false;
}
private void ParseFragmentSequence(IByteSource source, object state) {
try {
_result = DicomReaderResult.Processing;
while (!source.IsEOF) {
if (_state == ParseState.Tag) {
source.Mark();
if (!source.Require(8, ParseFragmentSequence, state)) {
_result = DicomReaderResult.Suspended;
return;
}
ushort group = source.GetUInt16();
ushort element = source.GetUInt16();
DicomTag tag = new DicomTag(group, element);
if (tag != DicomTag.Item && tag != DicomTag.SequenceDelimitationItem)
throw new DicomReaderException("Unexpected tag in DICOM fragment sequence: {0}", tag);
_length = source.GetUInt32();
if (tag == DicomTag.SequenceDelimitationItem) {
// end of fragment
_observer.OnEndFragmentSequence();
_fragmentItem = 0;
ResetState();
ParseDataset(source, PopState());
return;
}
_fragmentItem++;
_state = ParseState.Value;
}
if (_state == ParseState.Value) {
if (!source.Require(_length, ParseFragmentSequence, state)) {
_result = DicomReaderResult.Suspended;
return;
}
IByteBuffer buffer = source.GetBuffer(_length);
if (_fragmentItem == 1)
buffer = EndianByteBuffer.Create(buffer, source.Endian, 4);
else
buffer = EndianByteBuffer.Create(buffer, source.Endian, _vr.UnitSize);
_observer.OnFragmentSequenceItem(source, buffer);
_state = ParseState.Tag;
}
}
} catch (Exception e) {
_exception = e;
_result = DicomReaderResult.Error;
} finally {
if (_result != DicomReaderResult.Processing && _result != DicomReaderResult.Suspended) {
_async.Set();
}
}
}
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();
}
}
}
private bool IsPrivateSequence(IByteSource source) {
source.Mark();
try {
var group = source.GetUInt16();
var element = source.GetUInt16();
var tag = new DicomTag(group, element);
if (tag == DicomTag.Item || tag == DicomTag.SequenceDelimitationItem)
return true;
} finally {
source.Rewind();
}
return false;
}
public void OnBeginSequenceItem(IByteSource source, uint length)
{
foreach (IDicomReaderObserver observer in _observers) observer.OnBeginSequenceItem(source, length);
}
public void OnBeginSequence(IByteSource source, DicomTag tag, uint length)
{
foreach (IDicomReaderObserver observer in _observers) observer.OnBeginSequence(source, tag, length);
}
public void OnElement(IByteSource source, DicomTag tag, DicomVR vr, IByteBuffer data)
{
foreach (IDicomReaderObserver observer in _observers) observer.OnElement(source, tag, vr, data);
}
public void OnBeginFragmentSequence(IByteSource source, DicomTag tag, DicomVR vr)
{
foreach (IDicomReaderObserver observer in _observers) observer.OnBeginFragmentSequence(source, tag, vr);
}
public void OnBeginSequenceItem(IByteSource source, uint length)
{
}
public void OnElement(IByteSource source, DicomTag tag, DicomVR vr, IByteBuffer data)
{
this.Tag = tag;
this.VR = vr;
this.Data = Encoding.UTF8.GetString(data.Data);
}
public void OnBeginSequence(IByteSource source, DicomTag tag, uint length)
{
}
private void ParseDataset(IByteSource source, object state) {
try {
_result = DicomReaderResult.Processing;
while (!source.IsEOF && !source.HasReachedMilestone() && _result == DicomReaderResult.Processing) {
if (_state == ParseState.Tag) {
source.Mark();
if (!source.Require(4, ParseDataset, state)) {
_result = DicomReaderResult.Suspended;
return;
}
ushort group = source.GetUInt16();
ushort element = source.GetUInt16();
DicomPrivateCreator creator = null;
if (group.IsOdd() && element > 0x00ff) {
string pvt = null;
uint card = (uint)(group << 16) + (uint)(element >> 8);
if (_private.TryGetValue(card, out pvt))
creator = Dictionary.GetPrivateCreator(pvt);
}
_tag = new DicomTag(group, element, creator);
if (_stop != null && _tag.CompareTo(_stop) >= 0) {
_result = DicomReaderResult.Stopped;
return;
}
_state = ParseState.VR;
}
while (_state == ParseState.VR) {
if (_tag == DicomTag.Item || _tag == DicomTag.ItemDelimitationItem || _tag == DicomTag.SequenceDelimitationItem) {
_vr = DicomVR.NONE;
_state = ParseState.Length;
break;
}
if (IsExplicitVR) {
if (!source.Require(2, ParseDataset, state)) {
_result = DicomReaderResult.Suspended;
return;
}
byte[] bytes = source.GetBytes(2);
string vr = Encoding.UTF8.GetString(bytes, 0, bytes.Length);
try {
_vr = DicomVR.Parse(vr);
} catch {
// unable to parse VR
_vr = DicomVR.UN;
}
} else {
DicomDictionaryEntry entry = Dictionary[_tag];
if (entry != null) {
if (entry == DicomDictionary.UnknownTag)
_vr = DicomVR.UN;
else if (entry.ValueRepresentations.Contains(DicomVR.OB) && entry.ValueRepresentations.Contains(DicomVR.OW))
_vr = DicomVR.OW; // ???
else
_vr = entry.ValueRepresentations.FirstOrDefault();
}
}
if (_vr == null)
_vr = DicomVR.UN;
_state = ParseState.Length;
if (_vr == DicomVR.UN) {
if (_tag.Element == 0x0000) {
// Group Length to UL
_vr = DicomVR.UL;
break;
} else if (IsExplicitVR) {
break;
}
}
if (_tag.IsPrivate) {
if (_tag.Element != 0x0000 && _tag.Element <= 0x00ff && _vr == DicomVR.UN)
_vr = DicomVR.LO; // force private creator to LO
}
}
while (_state == ParseState.Length) {
if (_tag == DicomTag.Item || _tag == DicomTag.ItemDelimitationItem || _tag == DicomTag.SequenceDelimitationItem) {
if (!source.Require(4, ParseDataset, state)) {
_result = DicomReaderResult.Suspended;
return;
}
_length = source.GetUInt32();
_state = ParseState.Value;
break;
}
if (IsExplicitVR) {
if (_vr.Is16bitLength) {
if (!source.Require(2, ParseDataset, state)) {
_result = DicomReaderResult.Suspended;
return;
}
_length = source.GetUInt16();
} else {
if (!source.Require(6, ParseDataset, state)) {
_result = DicomReaderResult.Suspended;
return;
}
source.Skip(2);
_length = source.GetUInt32();
}
} else {
if (!source.Require(4, ParseDataset, state)) {
_result = DicomReaderResult.Suspended;
return;
}
_length = source.GetUInt32();
// assume that undefined length in implicit dataset is SQ
if (_length == UndefinedLength && _vr == DicomVR.UN)
_vr = DicomVR.SQ;
}
_state = ParseState.Value;
}
if (_state == ParseState.Value) {
// check dictionary for VR after reading length to handle 16-bit lengths
// check before reading value to handle SQ elements
if (_vr == DicomVR.UN && IsExplicitVR) {
var entry = Dictionary[_tag];
if (entry != null)
_vr = entry.ValueRepresentations.FirstOrDefault();
if (_vr == null)
_vr = DicomVR.UN;
}
if (_tag == DicomTag.ItemDelimitationItem) {
// end of sequence item
return;
}
while (_vr == DicomVR.SQ && _tag.IsPrivate) {
if (!IsPrivateSequence(source)) {
_vr = DicomVR.UN;
break;
}
if (IsPrivateSequenceBad(source)) {
_badPrivateSequence = true;
_explicit = !_explicit;
}
break;
}
if (_vr == DicomVR.SQ) {
// start of sequence
_observer.OnBeginSequence(source, _tag, _length);
_state = ParseState.Tag;
if (_length != UndefinedLength) {
_implicit = false;
source.PushMilestone(_length);
} else
_implicit = true;
PushState(state);
ParseItemSequence(source, null);
continue;
}
if (_length == UndefinedLength) {
_observer.OnBeginFragmentSequence(source, _tag, _vr);
_state = ParseState.Tag;
PushState(state);
ParseFragmentSequence(source, null);
continue;
}
if (!source.Require(_length, ParseDataset, state)) {
_result = DicomReaderResult.Suspended;
return;
}
IByteBuffer buffer = source.GetBuffer(_length);
if (!_vr.IsString)
buffer = EndianByteBuffer.Create(buffer, source.Endian, _vr.UnitSize);
_observer.OnElement(source, _tag, _vr, buffer);
// parse private creator value and add to lookup table
if (_tag.IsPrivate && _tag.Element != 0x0000 && _tag.Element <= 0x00ff) {
var creator = DicomEncoding.Default.GetString(buffer.Data, 0, buffer.Data.Length).TrimEnd((char)DicomVR.LO.PaddingValue);
var card = (uint)(_tag.Group << 16) + (uint)(_tag.Element);
_private[card] = creator;
}
ResetState();
}
}
if (source.HasReachedMilestone()) {
// end of explicit length sequence item
source.PopMilestone();
return;
}
if (_result != DicomReaderResult.Processing)
return;
// end of processing
_result = DicomReaderResult.Success;
} catch (Exception e) {
_exception = e;
_result = DicomReaderResult.Error;
} finally {
if (_result != DicomReaderResult.Processing && _result != DicomReaderResult.Suspended) {
_async.Set();
}
}
}
public void OnFragmentSequenceItem(IByteSource source, IByteBuffer data)
{
_fragment.Add(data);
}
public void OnFragmentSequenceItem(IByteSource source, IByteBuffer data)
{
foreach (IDicomReaderObserver observer in _observers) observer.OnFragmentSequenceItem(source, data);
}
public void OnBeginFragmentSequence(IByteSource source, DicomTag tag, DicomVR vr)
{
}