public new static DicomDirectory Open(string fileName)
{
var df = new DicomDirectory();
// reset datasets
df.FileMetaInfo.Clear();
df.Dataset.Clear();
try {
df.File = new FileReference(fileName);
using (var source = new FileByteSource(df.File)) {
DicomFileReader reader = new DicomFileReader();
var datasetObserver = new DicomDatasetReaderObserver(df.Dataset);
var dirObserver = new DicomDirectoryReaderObserver(df.Dataset);
reader.Read(source,
new DicomDatasetReaderObserver(df.FileMetaInfo),
new DicomReaderMultiObserver(datasetObserver, dirObserver));
df.Format = reader.FileFormat;
df.Dataset.InternalTransferSyntax = reader.Syntax;
df._directoryRecordSequence = df.Dataset.Get <DicomSequence>(DicomTag.DirectoryRecordSequence);
df.RootDirectoryRecord = dirObserver.BuildDirectoryRecords();
return(df);
}
} catch (Exception e) {
throw new DicomFileException(df, e.Message, e);
}
}
private static DicomDirectory FinalizeDicomDirectoryLoad(
DicomDirectory df,
DicomFileReader reader,
DicomDirectoryReaderObserver dirObserver,
DicomReaderResult result)
{
if (result == DicomReaderResult.Processing)
{
throw new DicomFileException(df, "Invalid read return state: {state}", result);
}
if (result == DicomReaderResult.Error)
{
return(null);
}
df.IsPartial = result == DicomReaderResult.Stopped || result == DicomReaderResult.Suspended;
df.Format = reader.FileFormat;
df.Dataset.InternalTransferSyntax = reader.Syntax;
df._directoryRecordSequence = df.Dataset.Get <DicomSequence>(DicomTag.DirectoryRecordSequence);
df.RootDirectoryRecord = dirObserver.BuildDirectoryRecords();
return(df);
}
public void Exact_Offsets_Should_All_Match()
{
var offsets = GenerateUniqueRandonmOffsets(155, 500000);
var root = new Container()
{
Sequence = new DicomDataset()
};
root.CreateChildren(offsets, 5, 3, 3, 2);
var allChildren = root.AllContainer.Skip(1).ToArray();
var sequence = new DicomSequence(DicomTag.DirectoryRecordSequence);
root.Sequence.AddOrUpdate(sequence);
var byteSource = new TestByteSource();
var observer = new DicomDirectoryReaderObserver(root.Sequence);
observer.OnBeginSequence(byteSource, DicomTag.DirectoryRecordSequence, 0);
foreach (var container in allChildren)
{
sequence.Items.Add(container.Sequence);
byteSource.Position = container.Offset + 8;
observer.OnBeginSequenceItem(byteSource, 0);
observer.OnEndSequenceItem();
}
observer.OnEndSequence();
var rootRecord = new DicomDirectoryRecord
{
LowerLevelDirectoryRecord = observer.BuildDirectoryRecords(),
};
root.AssertRecord(rootRecord);
}
/// <summary>
/// Asynchronously read DICOM Directory.
/// </summary>
/// <param name="fileName">File name.</param>
/// <param name="fallbackEncoding">Encoding to apply if it cannot be identified from DICOM directory.</param>
/// <param name="stop">Stop criterion in dataset.</param>
/// <returns>Awaitable <see cref="DicomDirectory"/> instance.</returns>
public static new async Task <DicomDirectory> OpenAsync(string fileName, Encoding fallbackEncoding, Func <ParseState, bool> stop = null)
{
if (fallbackEncoding == null)
{
throw new ArgumentNullException("fallbackEncoding");
}
var df = new DicomDirectory();
// reset datasets
df.FileMetaInfo.Clear();
df.Dataset.Clear();
try
{
df.File = IOManager.CreateFileReference(fileName);
using (var source = new FileByteSource(df.File))
{
var reader = new DicomFileReader();
var datasetObserver = new DicomDatasetReaderObserver(df.Dataset, fallbackEncoding);
var dirObserver = new DicomDirectoryReaderObserver(df.Dataset);
var result =
await
reader.ReadAsync(
source,
new DicomDatasetReaderObserver(df.FileMetaInfo),
new DicomReaderMultiObserver(datasetObserver, dirObserver),
stop).ConfigureAwait(false);
if (result == DicomReaderResult.Processing)
{
throw new DicomFileException(df, "Invalid read return state: {state}", result);
}
if (result == DicomReaderResult.Error)
{
return(null);
}
df.IsPartial = result == DicomReaderResult.Stopped || result == DicomReaderResult.Suspended;
df.Format = reader.FileFormat;
df.Dataset.InternalTransferSyntax = reader.Syntax;
df._directoryRecordSequence = df.Dataset.Get <DicomSequence>(DicomTag.DirectoryRecordSequence);
df.RootDirectoryRecord = dirObserver.BuildDirectoryRecords();
return(df);
}
}
catch (Exception e)
{
throw new DicomFileException(df, e.Message, e);
}
}
public void Duplicate_Offsets_Should_Not_Throw()
{
var offsets = new List <uint>(GenerateUniqueRandonmOffsets(155, 100000).Select(o => o * 5));
for (int i = 0; i < offsets.Count - 2; i += 2)
{
offsets[i + 1] = offsets[i];
}
var root = new Container()
{
Sequence = new DicomDataset()
};
root.CreateChildren(offsets, 5, 3, 3, 2);
var allChildren = root.AllContainer.Skip(1).ToArray();
var sequence = new DicomSequence(DicomTag.DirectoryRecordSequence);
root.Sequence.AddOrUpdate(sequence);
var byteSource = new TestByteSource();
var observer = new DicomDirectoryReaderObserver(root.Sequence);
observer.OnBeginSequence(byteSource, DicomTag.DirectoryRecordSequence, 0);
uint lastPosition = 0;
foreach (var container in allChildren)
{
sequence.Items.Add(container.Sequence);
var position = container.Offset + 8;
if (position == lastPosition)
{
position += 1;
}
lastPosition = position;
byteSource.Position = position;
observer.OnBeginSequenceItem(byteSource, 0);
observer.OnEndSequenceItem();
}
observer.OnEndSequence();
var rootRecord = new DicomDirectoryRecord
{
LowerLevelDirectoryRecord = observer.BuildDirectoryRecords(),
};
// Cannot assert all records when duplicate offsets exist.
// root.AssertRecord(rootRecord);
}