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>
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 DICOMWriteSettings
{
TransferSyntax = tx,
DoWriteIndefiniteSequences = false
}, dicomObject);
dicomBytes = stream.ToArray();
}
}
var split = new List<byte[]>();
int i = 0;
while (i < dicomBytes.Length)
{
int toTake = dicomBytes.Length >= (maxPduSize - 6) ? maxPduSize - 6 : dicomBytes.Length;
byte[] fragment = dicomBytes.Skip(i).Take(toTake).ToArray();
i += fragment.Length;
split.Add(fragment);
}
return split;
}
private static PresentationContext ReadPresentationCtxContents(byte[] contents, bool requestType = false)
{
var pc = new PresentationContext();
pc.TransferSyntaxes = new List <string>();
using (var dr = new DICOMBinaryReader(contents))
{
pc.Id = dr.Take(1)[0];
dr.Skip(1); //Reserved Null Byte
pc.Reason = (PresentationContextReason)Enum.ToObject(typeof(PresentationContextReason), dr.Take(1)[0]);
dr.Skip(1); //Reserved Null Byte
if (requestType)
{
pc.AbstractSyntax = ReadAbstractSyntax(dr).Trim();
}
while (dr.StreamPosition < dr.StreamLength)
{
var initPos = dr.StreamPosition;
pc.TransferSyntaxes.Add(ReadTransferSyntax(dr));
if (dr.StreamPosition == initPos)
{
break;
}
}
}
return(pc);
}
public PDataTF(byte[] data, bool isLastItem, bool isCommandObject, PresentationContext context)
: this()
{
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);
}
public static List<PDataTF> GetPDataTFs(AbstractDIMSEBase dimse, PresentationContext pContext, int maxPDULength = 16384)
{
var list = new List<PDataTF>();
var commandEls = dimse.Elements;
list.Add(new PDataTF(new DICOMObject(dimse.Elements), true, true, pContext));
var dataDIMSE = dimse as AbstractDIMSE;
if (dataDIMSE != null && dataDIMSE.Data != null)
{
List<byte[]> chunks = GetChunks(dataDIMSE.Data, maxPDULength, pContext);
chunks
.Select((c, i) => new PDataTF(c, i == chunks.Count - 1, false, pContext))
.ToList()
.ForEach(list.Add);
}
return list;
}
public static void WritePresentationCtxAcceptType(DICOMBinaryWriter dw, PresentationContext pc)
{
dw.Write((byte)ItemType.PRESENTATION_CONTEXT_ACCEPT);
dw.WriteNullBytes(1); //Reserved Null Byte
byte[] internBytes; //Will use to get length
using (var stream = new MemoryStream())
{
using (var intern = new DICOMBinaryWriter(stream))
{
intern.Write((byte)pc.Id);
intern.WriteNullBytes(1);
intern.Write((byte)pc.Reason);
intern.WriteNullBytes(1);
WriteTransferSyntax(intern, pc.TransferSyntaxes.First());
internBytes = stream.ToArray();
}
}
LengthWriter.WriteBigEndian(dw, internBytes.Length, 2);
dw.Write(internBytes);
}
public static List<PDataTF> GetPDataTFs(AbstractDIMSEBase dimse, Association asc, PresentationContext pContext = null)
{
pContext = pContext ?? asc.PresentationContexts.First(a => a.AbstractSyntax == dimse.AffectedSOPClassUID);
var list = new List<PDataTF>();
var commandEls = dimse.Elements;
list.Add(new PDataTF(new DICOMObject(dimse.Elements), true, true, pContext));
var dataDIMSE = dimse as AbstractDIMSE;
if (dataDIMSE != null && dataDIMSE.Data != null)
{
List<byte[]> chunks = GetChunks(dataDIMSE.Data, asc.UserInfo.MaxPDULength, asc);
chunks
.Select(
(c, i) =>
new PDataTF(c, i == chunks.Count - 1, false,
asc.PresentationContexts.First(a => a.AbstractSyntax == dimse.AffectedSOPClassUID)))
.ToList()
.ForEach(list.Add);
}
return list;
}
///// <summary>
///// Sends a request for DIMSE association to a DICOM service
///// </summary>
///// <param name="asc">the underlying association</param>
///// <param name="abstractSyntax">the proposed abstract syntaxes (what should the service be able to do)</param>
public static void SendRequest(Association asc, params string[] abstractSyntaxes)
{
var request = new Request {CalledEntityTitle = asc.AeTitle, CallingEntityTitle = asc.ServiceClass.ApplicationEntity.AeTitle};
abstractSyntaxes.Select((a, i) => new {a, i})
.ToList()
.ForEach(a =>
{
var pres = new PresentationContext
{
AbstractSyntax = a.a,
Id = a.i*2 + 1, //Convention of odd numbers
Reason = PresentationContextReason.ACCEPTANCE,
TransferSyntaxes = asc.ServiceClass.SupportedTransferSyntaxes
};
request.PresentationContexts.Add(pres);
});
asc.PresentationContexts.AddRange(request.PresentationContexts);
request.UserInfo = new UserInfo();
asc.Logger.Log("--> " + request);
asc.SendMessage(request);
}
public static void Send(AbstractDIMSEBase dimse, Association asc, PresentationContext pContext = null)
{
if (asc.State != NetworkState.TRANSPORT_CONNECTION_OPEN)
{
asc.OutboundMessages.Enqueue(dimse);
AssociationMessenger.SendRequest(asc, dimse.AffectedSOPClassUID);
}
else
{
asc.Logger.Log("--> DIMSE" + dimse.GetLogString());
dimse.LogData(asc);
var stream = asc.Stream;
List<PDataTF> pds = GetPDataTFs(dimse, asc, pContext);
if (pds.Count > 0 && stream.CanWrite)
{
foreach (PDataTF pd in pds)
{
byte[] message = pd.Write();
stream.Write(message, 0, message.Length);
}
}
}
}
public static void WritePresentationCtxAcceptType(DICOMBinaryWriter dw, PresentationContext pc)
{
dw.Write((byte) ItemType.PRESENTATION_CONTEXT_ACCEPT);
dw.WriteNullBytes(1); //Reserved Null Byte
byte[] internBytes; //Will use to get length
using (var stream = new MemoryStream())
{
using (var intern = new DICOMBinaryWriter(stream))
{
intern.Write((byte) pc.Id);
intern.WriteNullBytes(1);
intern.Write((byte) pc.Reason);
intern.WriteNullBytes(1);
WriteTransferSyntax(intern, pc.TransferSyntaxes.First());
internBytes = stream.ToArray();
}
}
LengthWriter.WriteBigEndian(dw, internBytes.Length, 2);
dw.Write(internBytes);
}
private static PresentationContext ReadPresentationCtxContents(byte[] contents, bool requestType = false)
{
var pc = new PresentationContext();
pc.TransferSyntaxes = new List<string>();
using (var dr = new DICOMBinaryReader(contents))
{
pc.Id = dr.Take(1)[0];
dr.Skip(1); //Reserved Null Byte
pc.Reason = (PresentationContextReason) Enum.ToObject(typeof (PresentationContextReason), dr.Take(1)[0]);
dr.Skip(1); //Reserved Null Byte
if (requestType)
{
pc.AbstractSyntax = ReadAbstractSyntax(dr).Trim();
}
while (dr.StreamPosition < dr.StreamLength)
{
long initPos = dr.StreamPosition;
pc.TransferSyntaxes.Add(ReadTransferSyntax(dr));
if (dr.StreamPosition == initPos)
{
break;
}
}
}
return pc;
}
