public void Read(RawPDU raw)
{
uint l = raw.Length;
raw.ReadUInt16("Version");
raw.SkipBytes("Reserved", 2);
raw.SkipBytes("Reserved", 16);
raw.SkipBytes("Reserved", 16);
raw.SkipBytes("Reserved", 32);
l -= 68;
while (l > 0)
{
byte type = raw.ReadByte("Item-Type");
l -= 1;
if (type == 0x10)
{
// Application Context
raw.SkipBytes("Reserved", 1);
ushort c = raw.ReadUInt16("Item-Length");
raw.SkipBytes("Value", (int)c);
l -= 3 + (uint)c;
}
else
if (type == 0x21)
{
// Presentation Context
raw.ReadByte("Reserved");
ushort pl = raw.ReadUInt16("Presentation Context Item-Length");
byte id = raw.ReadByte("Presentation Context ID");
raw.ReadByte("Reserved");
byte res = raw.ReadByte("Presentation Context Result/Reason");
raw.ReadByte("Reserved");
l -= (uint)pl + 3;
pl -= 4;
// Presentation Context Transfer Syntax
raw.ReadByte("Presentation Context Item-Type (0x40)");
raw.ReadByte("Reserved");
ushort tl = raw.ReadUInt16("Presentation Context Item-Length");
string tx = raw.ReadString("Presentation Context Syntax UID", tl);
pl -= (ushort)(tl + 4);
_assoc.SetPresentationContextResult(id, (DicomPresContextResult)res);
TransferSyntax acceptedSyntax = TransferSyntax.GetTransferSyntax(tx);
if (acceptedSyntax != null)
{
_assoc.SetAcceptedTransferSyntax(id, acceptedSyntax);
}
else
{
_assoc.GetPresentationContext(id).ClearTransfers();
}
}
else
if (type == 0x50)
{
// User Information
raw.ReadByte("Reserved");
ushort il = raw.ReadUInt16("User Information Item-Length");
l -= (uint)(il + 3);
while (il > 0)
{
byte ut = raw.ReadByte("User Item-Type");
raw.ReadByte("Reserved");
ushort ul = raw.ReadUInt16("User Item-Length");
il -= (ushort)(ul + 4);
if (ut == 0x51)
{
_assoc.RemoteMaximumPduLength = raw.ReadUInt32("Max PDU Length");
}
else if (ut == 0x52)
{
_assoc.ImplementationClass = DicomUids.Lookup(raw.ReadString("Implementation Class UID", ul));
}
else if (ut == 0x55)
{
_assoc.ImplementationVersion = raw.ReadString("Implementation Version", ul);
}
else
{
raw.SkipBytes("User Item Value", (int)ul);
}
}
}
else
{
raw.SkipBytes("Reserved", 1);
ushort il = raw.ReadUInt16("User Item-Length");
raw.SkipBytes("Unknown User Item", il);
l -= (uint)(il + 3);
}
}
}
public void Read(RawPDU raw)
{
uint l = raw.Length;
raw.ReadUInt16("Version");
raw.SkipBytes("Reserved", 2);
_assoc.CalledAE = raw.ReadString("Called AE", 16);
_assoc.CallingAE = raw.ReadString("Calling AE", 16);
raw.SkipBytes("Reserved", 32);
l -= 2 + 2 + 16 + 16 + 32;
while (l > 0)
{
byte type = raw.ReadByte("Item-Type");
raw.SkipBytes("Reserved", 1);
ushort il = raw.ReadUInt16("Item-Length");
l -= 4 + (uint)il;
if (type == 0x10)
{
// Application Context
raw.SkipBytes("Application Context", il);
}
else
if (type == 0x20)
{
// Presentation Context
byte id = raw.ReadByte("Presentation Context ID");
raw.SkipBytes("Reserved", 3);
il -= 4;
while (il > 0)
{
byte pt = raw.ReadByte("Presentation Context Item-Type");
raw.SkipBytes("Reserved", 1);
ushort pl = raw.ReadUInt16("Presentation Context Item-Length");
string sx = raw.ReadString("Presentation Context Syntax UID", pl);
if (pt == 0x30)
{
SopClass sopClass = SopClass.GetSopClass(sx);
if (sopClass == null)
{
sopClass = new SopClass("Private SOP Class", sx, false);
}
_assoc.AddPresentationContext(id, sopClass);
}
else if (pt == 0x40)
{
TransferSyntax transferSyntax = TransferSyntax.GetTransferSyntax(sx);
if (transferSyntax == null)
{
transferSyntax = new TransferSyntax("Private Syntax", sx, true, false, true, false, false, false);
}
_assoc.AddTransferSyntax(id, transferSyntax);
}
il -= (ushort)(4 + pl);
}
}
else
if (type == 0x50)
{
// User Information
while (il > 0)
{
byte ut = raw.ReadByte("User Information Item-Type");
raw.SkipBytes("Reserved", 1);
ushort ul = raw.ReadUInt16("User Information Item-Length");
il -= (ushort)(4 + ul);
if (ut == 0x51)
{
_assoc.RemoteMaximumPduLength = raw.ReadUInt32("Max PDU Length");
}
else if (ut == 0x52)
{
_assoc.ImplementationClass = new DicomUid(raw.ReadString("Implementation Class UID", ul), "Implementation Class UID", UidType.Unknown);
}
else if (ut == 0x53)
{
_assoc.RemoteMaxOperationsInvoked = raw.ReadUInt16("Max Operations Invoked");
_assoc.RemoteMaxOperationsPerformed = raw.ReadUInt16("Max Operations Performed");
}
else if (ut == 0x55)
{
_assoc.ImplementationVersion = raw.ReadString("Implementation Version", ul);
}
else if (ut == 0x54)
{
raw.SkipBytes("SCU/SCP Role Selection", ul);
/*
* ushort rsul = raw.ReadUInt16();
* if ((rsul + 4) != ul) {
* throw new DicomNetworkException("SCU/SCP role selection length (" + ul + " bytes) does not match uid length (" + rsul + " + 4 bytes)");
* }
* raw.ReadChars(rsul); // Abstract Syntax
* raw.ReadByte(); // SCU role
* raw.ReadByte(); // SCP role
*/
}
else
{
Platform.Log(LogLevel.Error, "Unhandled user item: 0x{0:x2} ({1} + 4 bytes)", ut, ul);
raw.SkipBytes("Unhandled User Item", ul);
}
}
}
}
}