/// <summary>
/// Read explicit VR little endian up to transfer syntax element and determines transfer syntax for rest of elements
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="syntax">the transfer syntax of the DICOM file</param>
/// <returns>elements preceeding and including transfer syntax element</returns>
public static List <IDICOMElement> ReadFileMetadata(DICOMBinaryReader dr, ref TransferSyntax syntax)
{
var elements = new List <IDICOMElement>();
syntax = syntax != TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN
? syntax
: TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN;
while (dr.StreamPosition < dr.StreamLength)
{
long position = dr.StreamPosition;
if (TagReader.ReadLittleEndian(dr).Group == _metaGroup)
{
dr.StreamPosition = position;
IDICOMElement el = DICOMElementReader.ReadElementExplicitLittleEndian(dr);
Tag uid = TagHelper.TRANSFER_SYNTAX_UID;
if (el.Tag == uid)
{
syntax = TransferSyntaxHelper.GetSyntax(el);
}
elements.Add(el);
}
else
{
dr.StreamPosition = position;
break;
}
}
return(elements);
}
public static void Write(DICOMBinaryWriter dw, DICOMIOSettings settings, DICOMObject d,
bool isSequenceItem = false)
{
if (!isSequenceItem)
{
TransferSyntaxHelper.SetSyntax(d, settings.TransferSyntax);
}
for (var i = 0; i < d.Elements.Count; i++)
{
var el = d.Elements[i];
var currentSettings = IsFileMetaGroup(el) ? settings.GetFileMetaSettings() : settings;
if (GroupWriter.IsGroupHeader(el))
{
var skip = GroupWriter.WriteGroup(dw, currentSettings, d, el);
i += skip;
}
else
{
_logger.LogInformation($"Writing element ${el.Tag.CompleteID}");
try
{
DICOMElementWriter.Write(dw, currentSettings, el);
}
catch (Exception e)
{
_logger.LogError($"Error writing : ${el.Tag.CompleteID}\n{e}");
throw e;
}
}
}
}
/// <summary>
/// Splits the DICOM object into chunks that are within the max PDU size
/// </summary>
/// <param name="dicomObject"> the DICOM objec to be split</param>
/// <param name="maxPduSize">the max length (in bytes) for a PDU</param>
/// <param name="asc">the association that the file will be sent</param>
/// <returns></returns>
public static List <byte[]> GetChunks(DICOMObject dicomObject, int maxPduSize, PresentationContext pc)
{
byte[] dicomBytes;
using (var stream = new MemoryStream())
{
using (var dw = new DICOMBinaryWriter(stream))
{
var tx = TransferSyntaxHelper.GetSyntax(pc.TransferSyntaxes.First());
DICOMObjectWriter.WriteSameSyntax(dw,
new DICOMIOSettings
{
TransferSyntax = tx,
DoWriteIndefiniteSequences = false
}, dicomObject);
dicomBytes = stream.ToArray();
}
}
var split = new List <byte[]>();
var i = 0;
while (i < dicomBytes.Length)
{
var toTake = dicomBytes.Length >= maxPduSize - 6 ? maxPduSize - 6 : dicomBytes.Length;
var fragment = dicomBytes.Skip(i).Take(toTake).ToArray();
i += fragment.Length;
split.Add(fragment);
}
return(split);
}
public DICOMWriteSettings ToDICOMWriteSettings()
{
var settings = DICOMWriteSettings.Default();
settings.TransferSyntax = TransferSyntaxHelper.GetSyntax(TransferSyntaxes.FirstOrDefault());
return(settings);
}
public PDataTF(DICOMObject dicom, bool isLastItem, bool isCommandObject, PresentationContext context)
: this()
{
byte[] data;
using (var stream = new MemoryStream())
{
using (var dw = new DICOMBinaryWriter(stream))
{
var settings = new DICOMWriteSettings();
settings.TransferSyntax = isCommandObject
? TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN
: TransferSyntaxHelper.GetSyntax(context.TransferSyntaxes[0]);
DICOMObjectWriter.Write(dw, settings, dicom);
data = stream.ToArray();
}
}
var frag = new PDVItemFragment();
frag.Data = data;
frag.IsLastItem = isLastItem;
frag.IsCommandObject = isCommandObject;
var item = new PDVItem();
item.Fragment = frag;
item.PresentationContextID = context.Id;
Items.Add(item);
}
/// <summary>
/// Splits the DICOM object into chunks that are within the max PDU size
/// </summary>
/// <param name="dicomObject"> the DICOM objec to be split</param>
/// <param name="maxPduSize">the max length (in bytes) for a PDU</param>
/// <param name="asc">the association that the file will be sent</param>
/// <returns></returns>
private static List <byte[]> GetChunks(DICOMObject dicomObject, int maxPduSize, Association asc)
{
byte[] dicomBytes;
using (var stream = new MemoryStream())
{
using (var dw = new DICOMBinaryWriter(stream))
{
DICOMObjectWriter.Write(dw,
new DICOMWriteSettings
{
TransferSyntax =
TransferSyntaxHelper.GetSyntax(asc.PresentationContexts.First().TransferSyntaxes.First()),
DoWriteIndefiniteSequences = false
}, dicomObject);
dicomBytes = stream.ToArray();
}
}
var split = new List <byte[]>();
int i = 0;
while (i < dicomBytes.Length)
{
int toTake = dicomBytes.Length >= (maxPduSize - 6) + i ? maxPduSize - 6 : dicomBytes.Length - i;
byte[] fragment = dicomBytes.Skip(i).Take(toTake).ToArray();
i += fragment.Length;
split.Add(fragment);
}
return(split);
}
/// <summary>
/// Read explicit VR little endian up to transfer syntax element and determines transfer syntax for rest of elements
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="syntax">the transfer syntax of the DICOM file</param>
/// <returns>elements preceeding and including transfer syntax element</returns>
private static List <IDICOMElement> ReadFileMetadata(DICOMBinaryReader dr, out TransferSyntax syntax)
{
List <IDICOMElement> elements = new List <IDICOMElement>();
syntax = TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN;
while (dr.StreamPosition < dr.StreamLength)
{
long position = dr.StreamPosition;
if (TagReader.ReadLittleEndian(dr).Group == _MetaGroup)
{
dr.StreamPosition = position;
IDICOMElement el = DICOMElementReader.ReadElementExplicitLittleEndian(dr);
if (el.Tag.CompleteID == TagHelper.TRANSFER_SYNTAX_UID.CompleteID)
{
syntax = TransferSyntaxHelper.GetSyntax(el);
}
elements.Add(el);
}
else
{
dr.StreamPosition = position;
break;
}
}
return(elements);
}
/// <summary>
/// Read explicit VR little endian up to transfer syntax element and determines transfer syntax for rest of elements
/// </summary>
/// <param name="dr">the binary reader which is reading the DICOM object</param>
/// <param name="syntax">the transfer syntax of the DICOM file</param>
/// <returns>elements preceeding and including transfer syntax element</returns>
public static List <IDICOMElement> ReadFileMetadata(DICOMBinaryReader dr, ref TransferSyntax syntax, ref StringEncoding enc)
{
var elements = new List <IDICOMElement>();
while (dr.StreamPosition < dr.StreamLength)
{
var position = dr.StreamPosition;
if (TagReader.ReadLittleEndian(dr).Group == _metaGroup)
{
dr.StreamPosition = position;
var el = DICOMElementReader.ReadElementExplicitLittleEndian(dr, enc);
if (el.Tag == TagHelper.TransferSyntaxUID)
{
syntax = TransferSyntaxHelper.GetSyntax(el);
}
elements.Add(el);
}
else
{
dr.StreamPosition = position;
break;
}
}
return(elements);
}
private static TransferSyntax GetTransferSyntax(Association asc, List <PDataTF> dataPds, out int presCtxId)
{
var ctx =
asc.PresentationContexts.FirstOrDefault(p => p.Id == dataPds.First().Items.First().PresentationContextID);
presCtxId = ctx.Id;
return(ctx != null?TransferSyntaxHelper.GetSyntax(ctx.TransferSyntaxes.First()) : TransferSyntax.IMPLICIT_VR_LITTLE_ENDIAN);
}
public static void Write(string filePath, DICOMWriteSettings settings, DICOMObject toWrite)
{
using (DICOMBinaryWriter dw = new DICOMBinaryWriter(filePath))
{
DICOMPreambleWriter.Write(dw);
TransferSyntaxHelper.SetSyntax(toWrite, settings.TransferSyntax);
DICOMObjectWriter.WriteObjectLittleEndian(dw, settings, toWrite);
}
}
/// <summary>
/// Write DICOM file out (bytes) to a specified stream
/// </summary>
/// <param name="stream">the stream to which to write the file</param>
/// <param name="settings">the write settings</param>
/// <param name="toWrite">the object to write</param>
public static void Write(Stream stream, DICOMWriteSettings settings, DICOMObject toWrite)
{
settings = settings ?? DICOMWriteSettings.Default();
using (var dw = new DICOMBinaryWriter(stream))
{
DICOMPreambleWriter.Write(dw);
TransferSyntaxHelper.SetSyntax(toWrite, settings.TransferSyntax);
DICOMObjectWriter.Write(dw, settings, toWrite);
}
}
/// <summary>
/// Writes DICOM object to a file
/// </summary>
/// <param name="file">the path to write</param>
/// <param name="settings">the DICOM settings to write (endianness, and indefinite sequences)</param>
public void Write(string file, DICOMWriteSettings settings = null)
{
settings = settings ?? DICOMWriteSettings.Default();
//If image is compressed, lets not change the transfer syntax UID (so image will not be read incorrectly)
var setSyntax = GetSelector().TransferSyntaxUID?.Data;
if (setSyntax != null && TransferSyntaxHelper.IsCompressedImage(setSyntax))
{
settings.TransferSyntax = TransferSyntaxHelper.GetSyntax(setSyntax);
}
DICOMFileWriter.Write(file, settings, this);
}
public static void WriteLittleEndian(string filePath, DICOMObject toWrite)
{
DICOMWriteSettings settings = DICOMWriteSettings.Default();
IDICOMElement currentUID = toWrite.FindFirst(TagHelper.TRANSFER_SYNTAX_UID);
if (currentUID != null)
{
settings.TransferSyntax = TransferSyntaxHelper.GetSyntax(currentUID);
}
//TODO Currently don't support BigEndian writing : switch syntax to supported
if (settings.TransferSyntax == TransferSyntax.EXPLICIT_VR_BIG_ENDIAN)
{
settings.TransferSyntax = TransferSyntax.EXPLICIT_VR_LITTLE_ENDIAN;
}
Write(filePath, settings, toWrite);
}
/// <summary>
/// Ignores the rule of writing metadata in explicit VR little endian and instead writes all elements with the passed in syntax
/// </summary>
/// <param name="dw"></param>
/// <param name="settings"></param>
/// <param name="d"></param>
/// <param name="isSequenceItem"></param>
public static void WriteSameSyntax(DICOMBinaryWriter dw, DICOMWriteSettings settings, DICOMObject d, bool isSequenceItem = false)
{
for (int i = 0; i < d.Elements.Count; i++)
{
IDICOMElement el = d.Elements[i];
if (!isSequenceItem)
{
TransferSyntaxHelper.SetSyntax(d, settings.TransferSyntax);
}
if (GroupWriter.IsGroupHeader(el))
{
int skip = GroupWriter.WriteGroup(dw, settings, d, el);
i += skip;
}
else
{
DICOMElementWriter.Write(dw, settings, el);
}
}
}
public static void Write(DICOMBinaryWriter dw, DICOMWriteSettings settings, DICOMObject d,
bool isSequenceItem = false)
{
for (var i = 0; i < d.Elements.Count; i++)
{
var el = d.Elements[i];
if (!isSequenceItem)
{
TransferSyntaxHelper.SetSyntax(d, settings.TransferSyntax);
}
var currentSettings = IsFileMetaGroup(el) ? settings.GetFileMetaSettings() : settings;
if (GroupWriter.IsGroupHeader(el))
{
var skip = GroupWriter.WriteGroup(dw, currentSettings, d, el);
i += skip;
}
else
{
DICOMElementWriter.Write(dw, currentSettings, el);
}
}
}