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));
}
private static async Task <Tuple <DicomReaderResult, DicomFileFormat, DicomTransferSyntax> > DoParseAsync(
IByteSource source,
IDicomReaderObserver fileMetasetInfoObserver,
IDicomReaderObserver datasetObserver,
Func <ParseState, bool> stop,
DicomTransferSyntax syntax,
DicomFileFormat fileFormat)
{
string code = null, uid = null;
var obs = new DicomReaderCallbackObserver();
if (fileFormat != DicomFileFormat.DICOM3)
{
obs.Add(
DicomTag.RecognitionCodeRETIRED,
(sender, ea) =>
{
try
{
code = Encoding.UTF8.GetString(ea.Data.Data, 0, ea.Data.Data.Length);
}
catch
{
}
});
}
obs.Add(
DicomTag.TransferSyntaxUID,
(sender, ea) =>
{
try
{
uid = Encoding.UTF8.GetString(ea.Data.Data, 0, ea.Data.Data.Length);
}
catch
{
}
});
var reader = new DicomReader {
IsExplicitVR = syntax.IsExplicitVR, IsDeflated = false
};
DicomReaderResult result;
if (fileFormat == DicomFileFormat.DICOM3NoFileMetaInfo)
{
result =
await
reader.ReadAsync(source, new DicomReaderMultiObserver(obs, datasetObserver), stop).ConfigureAwait(false);
UpdateFileFormatAndSyntax(code, uid, ref fileFormat, ref syntax);
}
else
{
if (
await
reader.ReadAsync(
source,
new DicomReaderMultiObserver(obs, fileMetasetInfoObserver),
_FileMetaInfoStopCriterion).ConfigureAwait(false) != DicomReaderResult.Stopped)
{
throw new DicomReaderException("DICOM File Meta Info ended prematurely");
}
UpdateFileFormatAndSyntax(code, uid, ref fileFormat, ref syntax);
// rewind to last marker (start of previous tag)... ugly because
// it requires knowledge of how the parser is implemented
source.Rewind();
source.Endian = syntax.Endian;
reader.IsExplicitVR = syntax.IsExplicitVR;
reader.IsDeflated = syntax.IsDeflate;
result = await reader.ReadAsync(source, datasetObserver, stop).ConfigureAwait(false);
}
return(Tuple.Create(result, fileFormat, syntax));
}
private static async Task<Tuple<DicomReaderResult, DicomFileFormat, DicomTransferSyntax>> DoParseAsync(
IByteSource source,
IDicomReaderObserver fileMetasetInfoObserver,
IDicomReaderObserver datasetObserver,
Func<ParseState, bool> stop,
DicomTransferSyntax syntax,
DicomFileFormat fileFormat)
{
string code = null, uid = null;
var obs = new DicomReaderCallbackObserver();
if (fileFormat != DicomFileFormat.DICOM3)
{
obs.Add(
DicomTag.RecognitionCodeRETIRED,
(sender, ea) =>
{
try
{
code = Encoding.UTF8.GetString(ea.Data.Data, 0, ea.Data.Data.Length);
}
catch
{
}
});
}
obs.Add(
DicomTag.TransferSyntaxUID,
(sender, ea) =>
{
try
{
uid = Encoding.UTF8.GetString(ea.Data.Data, 0, ea.Data.Data.Length);
}
catch
{
}
});
var reader = new DicomReader { IsExplicitVR = syntax.IsExplicitVR, IsDeflated = false };
DicomReaderResult result;
if (fileFormat == DicomFileFormat.DICOM3NoFileMetaInfo)
{
result =
await
reader.ReadAsync(source, new DicomReaderMultiObserver(obs, datasetObserver), stop).ConfigureAwait(false);
UpdateFileFormatAndSyntax(code, uid, ref fileFormat, ref syntax);
}
else
{
if (
await
reader.ReadAsync(
source,
new DicomReaderMultiObserver(obs, fileMetasetInfoObserver),
FileMetaInfoStopCriterion).ConfigureAwait(false) != DicomReaderResult.Stopped)
{
throw new DicomReaderException("DICOM File Meta Info ended prematurely");
}
UpdateFileFormatAndSyntax(code, uid, ref fileFormat, ref syntax);
// rewind to last marker (start of previous tag)... ugly because
// it requires knowledge of how the parser is implemented
source.Rewind();
source.Endian = syntax.Endian;
reader.IsExplicitVR = syntax.IsExplicitVR;
reader.IsDeflated = syntax.IsDeflate;
result = await reader.ReadAsync(source, datasetObserver, stop).ConfigureAwait(false);
}
return Tuple.Create(result, fileFormat, syntax);
}
