private static PreambleStatus Read(DICOMBinaryReader dr)
{
bool mismatchPreamble123 = false;
if (dr.StreamLength > 132)
{
byte[] nullPreamble = dr.Take(128);
if (nullPreamble.Any(b => b != 0x00))
{
mismatchPreamble123 = true;
}
//READ D I C M
byte[] dcm = dr.Take(4);
if (dcm[0] != 'D' || dcm[1] != 'I' || dcm[2] != 'C' || dcm[3] != 'M')
{
return(PreambleStatus.WrongPreambleDicm);
}
if (mismatchPreamble123)
{
return(PreambleStatus.MismatchPreamble128);
}
return(PreambleStatus.Ok);
}
return(PreambleStatus.None);
}
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 static PresentationContext ReadPresentationCtxAccept(DICOMBinaryReader dr)
{
AssertItemType(dr, "Presentation Context Accept", ItemType.PRESENTATION_CONTEXT_ACCEPT);
dr.Skip(2); // PDU id Reserved Null Byte
var length = LengthReader.ReadBigEndian(dr, 2);
return(ReadPresentationCtxContents(dr.Take(length)));
}
public static PresentationContext ReadPresentationCtxRequest(DICOMBinaryReader dr)
{
AssertItemType(dr, "Presentation Context Request", ItemType.PRESENTATION_CONTEXT_REQUEST);
dr.Skip(2); // PDU id Reserved Null Byte
int length = LengthReader.ReadBigEndian(dr, 2);
return(ReadPresentationCtxContents(dr.Take(length), true));
}
public static PDVItem ReadPDVItem(DICOMBinaryReader dr)
{
var pi = new PDVItem();
var length = LengthReader.ReadBigEndian(dr, 4);
pi.PresentationContextID = dr.Take(1)[0];
pi.Fragment = ReadPDVFragment(dr, length - 1);
return(pi);
}
public static PDVItemFragment ReadPDVFragment(DICOMBinaryReader dr, int length)
{
var pif = new PDVItemFragment();
var messageHeader = dr.Take(1)[0];
pif.IsCommandObject = messageHeader.GetBit(0);
pif.IsLastItem = messageHeader.GetBit(1);
pif.Data = dr.ReadBytes(length - 1);
return(pif);
}