private DicomReadStatus ParseSequenceItemDataset(DicomTransferSyntax syntax, long len, out DcmDataset dataset, DicomReadOptions options)
{
long pos = _stream.Position;
dataset = new DcmDataset(pos, (uint)len, syntax);
Stream stream = (len != UndefinedLength) ? new SegmentStream(_stream, _stream.Position, _len) : _stream;
DicomStreamReader idsr = new DicomStreamReader(stream);
idsr.Dataset = dataset;
idsr.Encoding = _encoding;
if (len != UndefinedLength)
{
idsr.PositionOffset = dataset.StreamPosition;
}
DicomReadStatus status = idsr.Read(null, options);
if (status != DicomReadStatus.Success)
{
_stream.Seek(pos, SeekOrigin.Begin);
dataset = null;
}
else
{
if (len == UndefinedLength)
{
// rewind delimitation item tag
_stream.Seek(-4, SeekOrigin.Current);
len = _stream.Position - pos;
}
_remain -= len;
_bytes += len;
_read += len;
}
return(status);
}
public void CloseDataset()
{
DatasetStream = null;
DatasetData = null;
DatasetReader = null;
if (DatasetFileStream != null) {
DatasetFileStream.Dispose();
DatasetFileStream = null;
}
}
public void CloseCommand()
{
CommandData = null;
CommandReader = null;
}
private DicomReadStatus ParseSequenceItemDataset(DicomTransferSyntax syntax, long len, out DcmDataset dataset, DicomReadOptions options)
{
long pos = _stream.Position;
dataset = new DcmDataset(pos, (uint)len, syntax);
Stream stream = (len != UndefinedLength) ? new SegmentStream(_stream, _stream.Position, _len) : _stream;
DicomStreamReader idsr = new DicomStreamReader(stream);
idsr.Dataset = dataset;
idsr.Encoding = _encoding;
if (len != UndefinedLength)
idsr.PositionOffset = dataset.StreamPosition;
DicomReadStatus status = idsr.Read(null, options);
if (status != DicomReadStatus.Success) {
_stream.Seek(pos, SeekOrigin.Begin);
dataset = null;
}
else {
if (len == UndefinedLength) {
// rewind delimitation item tag
_stream.Seek(-4, SeekOrigin.Current);
len = _stream.Position - pos;
}
_remain -= len;
_bytes += len;
_read += len;
}
return status;
}
/// <summary>
/// Gets file stream starting at DICOM dataset
/// </summary>
/// <param name="file">Filename</param>
/// <returns>File stream</returns>
public static FileStream GetDatasetStream(String file) {
FileStream fs = File.OpenRead(file);
fs.Seek(128, SeekOrigin.Begin);
CheckFileHeader(fs);
DicomStreamReader dsr = new DicomStreamReader(fs);
DcmFileMetaInfo metainfo = new DcmFileMetaInfo();
dsr.Dataset = metainfo;
if (dsr.Read(DcmFileMetaInfo.StopTag, DicomReadOptions.Default | DicomReadOptions.FileMetaInfoOnly) == DicomReadStatus.Success && fs.Position < fs.Length) {
return fs;
}
fs.Close();
return null;
}
/// <summary>
/// Gets the file meta information from a DICOM file
/// </summary>
/// <param name="file">Filename</param>
/// <returns>File meta information</returns>
public static DcmFileMetaInfo LoadFileMetaInfo(String file) {
using (FileStream fs = File.OpenRead(file)) {
fs.Seek(128, SeekOrigin.Begin);
CheckFileHeader(fs);
DicomStreamReader dsr = new DicomStreamReader(fs);
DcmFileMetaInfo metainfo = new DcmFileMetaInfo();
dsr.Dataset = metainfo;
dsr.Read(DcmFileMetaInfo.StopTag, DicomReadOptions.Default | DicomReadOptions.FileMetaInfoOnly);
fs.Close();
return metainfo;
}
}
/// <summary>
/// Loads a dicom file, stopping at a certain tag
/// </summary>
/// <param name="file">Filename</param>
/// <param name="stopTag">Tag to stop parsing at</param>
/// <param name="options">DICOM read options</param>
public DicomReadStatus Load(String file, DicomTag stopTag, DicomReadOptions options) {
using (FileStream fs = File.OpenRead(file)) {
fs.Seek(128, SeekOrigin.Begin);
CheckFileHeader(fs);
DicomStreamReader dsr = new DicomStreamReader(fs);
_metainfo = new DcmFileMetaInfo();
dsr.Dataset = _metainfo;
dsr.Read(DcmFileMetaInfo.StopTag, options | DicomReadOptions.FileMetaInfoOnly);
if (_metainfo.TransferSyntax.IsDeflate) {
MemoryStream ms = StreamUtility.Deflate(fs, false);
dsr = new DicomStreamReader(ms);
}
_dataset = new DcmDataset(_metainfo.TransferSyntax);
dsr.Dataset = _dataset;
DicomReadStatus status = dsr.Read(stopTag, options);
fs.Close();
return status;
}
}
/// <summary>
/// Gets the file meta information from a DICOM file
/// </summary>
/// <param name="file">Filename</param>
/// <param name="useIsoStore">Load file from isolated storage</param>
/// <returns>File meta information</returns>
public static DcmFileMetaInfo LoadFileMetaInfo(String file, bool useIsoStore = false)
{
if (useIsoStore)
{
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
using (var fs = store.OpenFile(file, FileMode.Open, FileAccess.Read))
{
fs.Seek(128, SeekOrigin.Begin);
if (!CheckFileHeader(fs)) return null;
DicomStreamReader dsr = new DicomStreamReader(fs);
DcmFileMetaInfo metainfo = new DcmFileMetaInfo();
dsr.Dataset = metainfo;
dsr.Read(DcmFileMetaInfo.StopTag, DicomReadOptions.Default | DicomReadOptions.FileMetaInfoOnly);
fs.Close();
return metainfo;
}
}
}
else
{
using (var fs = File.OpenRead(file))
{
fs.Seek(128, SeekOrigin.Begin);
CheckFileHeader(fs);
DicomStreamReader dsr = new DicomStreamReader(fs);
DcmFileMetaInfo metainfo = new DcmFileMetaInfo();
dsr.Dataset = metainfo;
dsr.Read(DcmFileMetaInfo.StopTag, DicomReadOptions.Default | DicomReadOptions.FileMetaInfoOnly);
fs.Close();
return metainfo;
}
}
}
/// <summary>
/// Gets file stream starting at DICOM dataset
/// </summary>
/// <param name="file">Filename</param>
/// <param name="useIsoStore">Get dataset from isolated store</param>
/// <returns>File stream</returns>
public static FileStream GetDatasetStream(String file, bool useIsoStore = false)
{
if (useIsoStore)
{
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
var fs = store.OpenFile(file, FileMode.Open, FileAccess.Read);
fs.Seek(128, SeekOrigin.Begin);
CheckFileHeader(fs);
DicomStreamReader dsr = new DicomStreamReader(fs);
DcmFileMetaInfo metainfo = new DcmFileMetaInfo();
dsr.Dataset = metainfo;
if (
dsr.Read(DcmFileMetaInfo.StopTag, DicomReadOptions.Default | DicomReadOptions.FileMetaInfoOnly) ==
DicomReadStatus.Success && fs.Position < fs.Length)
{
return fs;
}
fs.Close();
return null;
}
}
else
{
FileStream fs = File.OpenRead(file);
fs.Seek(128, SeekOrigin.Begin);
CheckFileHeader(fs);
DicomStreamReader dsr = new DicomStreamReader(fs);
DcmFileMetaInfo metainfo = new DcmFileMetaInfo();
dsr.Dataset = metainfo;
if (dsr.Read(DcmFileMetaInfo.StopTag, DicomReadOptions.Default | DicomReadOptions.FileMetaInfoOnly) == DicomReadStatus.Success && fs.Position < fs.Length)
{
return fs;
}
fs.Close();
return null;
}
}
/// <summary>
/// Loads a dicom file from a stream, stopping at a certain tag
/// </summary>
/// <param name="stream">Stream containing DICOM file</param>
/// <param name="stopTag">Tag to stop parsing at</param>
/// <param name="options">DICOM read options</param>
public DicomReadStatus Load(Stream stream, DicomTag stopTag, DicomReadOptions options)
{
stream.Seek(128, SeekOrigin.Begin);
CheckFileHeader(stream);
DicomStreamReader dsr = new DicomStreamReader(stream);
_metainfo = new DcmFileMetaInfo();
dsr.Dataset = _metainfo;
dsr.Read(DcmFileMetaInfo.StopTag, options | DicomReadOptions.FileMetaInfoOnly);
if (_metainfo.TransferSyntax.IsDeflate)
{
MemoryStream ms = StreamUtility.Deflate(stream, false);
dsr = new DicomStreamReader(ms);
}
_dataset = new DcmDataset(_metainfo.TransferSyntax);
dsr.Dataset = _dataset;
DicomReadStatus status = dsr.Read(stopTag, options);
return status;
}
/// <summary>
/// Loads the meta information from a DICOM file in a stream.
/// Note that the caller is expected to dispose of the stream after usage.
/// </summary>
/// <param name="stream">The stream fontaining the DICOM file</param>
/// <returns>File meta information</returns>
public static DcmFileMetaInfo LoadFileMetaInfo(Stream stream)
{
stream.Seek(128, SeekOrigin.Begin);
CheckFileHeader(stream);
DicomStreamReader dsr = new DicomStreamReader(stream);
DcmFileMetaInfo metainfo = new DcmFileMetaInfo();
dsr.Dataset = metainfo;
dsr.Read(DcmFileMetaInfo.StopTag, DicomReadOptions.Default | DicomReadOptions.FileMetaInfoOnly);
return metainfo;
}
