public TCHBurst(L3Handler l3)
{
Name = "TCH";
ShortName = "TC ";
FACCH = new FACCHBurst(l3);
L2 = FACCH.L2;
L3 = FACCH.L3;
InitBuffers(8);
}
public TCHBurst(L3Handler l3, string name, int subChan)
{
Name = name;
ShortName = "TC" + subChan;
SubChannel = subChan;
FACCH = new FACCHBurst(l3, subChan);
L2 = FACCH.L2;
L3 = FACCH.L3;
InitBuffers(8);
}
public void Handle(GSMParameters param, NormalBurst source, L3Handler l3, byte[] l2Data, int startOffset)
{
if (param.PacketDumper != null)
{
param.PacketDumper.WriteL2Data(l2Data);
}
Builder.Length = 0;
/* BCCH and CCCH packets have pseudo L2 headers (GSM 04.07 11.3.1) */
if (source.GetType() == typeof(BCCHBurst) || source.GetType() == typeof(CCCHBurst))
{
Builder.Append("Pseudo L2 Header").Append(Environment.NewLine);
if (source.ChannelEncrypted)
{
Builder.Append("======= encrypted =======").Append(Environment.NewLine);
}
/* call LUA script */
if (param.LuaVm != null)
{
LuaHelpers.CallFunction(param.LuaVm, "L2DataReceived", true, source, null, param);
}
/* pass to L3 handler if not empty and skip pseudo length */
if (!PacketIsEmpty(l2Data, 1))
{
l3.Handle(l2Data, 1, param);
}
}
else
{
/* always show empty/multiframe messages if requested */
ShowMessage = ShowAllMessages;
/* show if encrypted */
if (source.ChannelEncrypted)
{
ShowMessage |= ShowCryptedMessages;
Builder.Append("======= encrypted =======").Append(Environment.NewLine);
}
L2Data.Payload = l2Data;
L2Data.StartOffset = startOffset;
/* call LUA script */
if (param.LuaVm != null)
{
LuaHelpers.CallFunction(param.LuaVm, "L2DataReceived", true, source, L2Data, param);
}
if (L3Handler.ExceptFieldsEnabled || ShowMessage)
{
Builder.Append("SAPI: ").Append(L2Data.SAPI).Append(" C/R: ").Append((L2Data.CR ? "1" : "0")).Append(" EA: ").Append((L2Data.EA ? "1" : "0")).Append(" ");
Builder.Append("M: ").Append((L2Data.M ? "1" : "0")).Append(" ");
Builder.Append("EL: ").Append((L2Data.EL ? "1" : "0")).Append(" ");
Builder.Append("L: ").Append(L2Data.Length).Append(" ");
switch (L2Data.FrameFormat)
{
case eFrameFormat.S_Format:
Builder.Append("S Format, N(R)=").Append(L2Data.NR).Append(" S=").Append(L2Data.S).Append(" ").Append((eSupervisory)L2Data.S);
break;
case eFrameFormat.U_Format:
Builder.Append("U Format, U=").Append(L2Data.U).Append(" ").Append((eUnnumbered)L2Data.U);
break;
case eFrameFormat.I_Format:
Builder.Append("I Format, N(R)=").Append(L2Data.NR).Append(" N(S)=").Append(L2Data.NS).Append(" ");
break;
}
}
/* check if there is enough space in the buffer */
if (L2Data.Length + packetBufferOffset <= packetBuffer.Length && L2Data.Length + L2Data.DataStart <= L2Data.Payload.Length)
{
/* dont buffer when its the same frame number (retransmission) */
if (!L2Data.M || LastNS < L2Data.NS)
{
Array.Copy(L2Data.Payload, L2Data.DataStart, packetBuffer, packetBufferOffset, L2Data.Length);
packetBufferOffset += L2Data.Length;
LastNS = L2Data.NS;
}
else
{
if (L3Handler.ExceptFieldsEnabled || ShowMessage)
{
Builder.Append("!! Retransmission !! ");
}
}
}
else
{
if (DumpFaulty)
{
Builder.Append("Faulty length?! Length = ").Append((packetBufferOffset + L2Data.Length)).Append(Environment.NewLine);
Builder.Append("Raw L2 data").Append(Environment.NewLine);
Builder.Append(" ").Append(DumpBytes(l2Data)).Append(Environment.NewLine);
ShowMessage = true;
}
}
/* that counter is just for convinience */
NumPackets++;
/* when reached the last packet, pass it to L3 handler */
if (!L2Data.M)
{
if (L3Handler.ExceptFieldsEnabled || ShowMessage)
{
if (NumPackets > 1)
{
Builder.Append("(packet ").Append(NumPackets).Append(", total ").Append(packetBufferOffset).Append(" bytes)").Append(Environment.NewLine);
}
else
{
Builder.Append(Environment.NewLine);
}
}
/* but only pass it through when there is any data */
if (packetBufferOffset > 0)
{
/* allocate a new array with the correct size */
byte[] buf = new byte[packetBufferOffset];
Array.Copy(packetBuffer, buf, buf.Length);
if (!PacketIsEmpty(buf))
{
l3.Handle(buf, 0, param);
}
}
/* reset the buffer etc */
packetBufferOffset = 0;
for (int pos = 0; pos < packetBuffer.Length; pos++)
{
packetBuffer[pos] = 0xCC;
}
NumPackets = 0;
LastNS = -1;
}
else if (L3Handler.ExceptFieldsEnabled || ShowMessage)
{
Builder.Append("(packet ").Append(NumPackets).Append(")").Append(Environment.NewLine);
}
}
if (DumpRawData && (L3Handler.ExceptFieldsEnabled || ShowMessage))
{
Builder.Append("Raw L2 data").Append(Environment.NewLine);
Builder.Append(" ").Append(DumpBytes(l2Data)).Append(Environment.NewLine);
}
StatusMessage = Builder.ToString();
}
public void Handle(GSMParameters param, NormalBurst source, L3Handler l3, byte[] l2Data)
{
Handle(param, source, l3, l2Data, 0);
}
