public static void ParsePacket(byte[] packet, out byte command, out byte[] payload)
{
var headerBytes = new ArraySegment <byte>(packet, 0, HEADER_SIZE).ToArray();
HeaderStruct header = StructInterop.ByteArrayToStruct <HeaderStruct>(headerBytes);
// Payload
if (header.length > 0)
{
payload = new ArraySegment <byte>(packet, HEADER_SIZE, header.length).ToArray();
}
else
{
payload = null;
}
var footerBytes = new ArraySegment <byte>(packet, HEADER_SIZE + header.length, FOOTER_SIZE).ToArray();
FooterStruct footer = StructInterop.ByteArrayToStruct <FooterStruct>(footerBytes);
// Detect protocol errors
if (header.command == CMD_ERROR)
{
if (payload != null && payload.Length > 0)
{
throw HLDCProtocolException.FromCode(payload[0]);
}
else
{
throw new HLDCException("Protocol malformed error message");
}
}
command = header.command;
}
public static void ParsePacket(byte[] packet, out byte command, out byte[] payload)
{
// NOTE: Assumes packet has a complete HLDC frame (excluding the SOF/EOF bytes)
// Use the HLDCFramer helper class to receive a complete HLDC frame
var headerBytes = new ArraySegment <byte>(packet, 0, HEADER_SIZE).ToArray();
HeaderStruct header = StructInterop.ByteArrayToStruct <HeaderStruct>(headerBytes);
// Payload
if (header.length > 0)
{
payload = new ArraySegment <byte>(packet, HEADER_SIZE, header.length).ToArray();
}
else
{
payload = null;
}
var footerBytes = new ArraySegment <byte>(packet, HEADER_SIZE + header.length, FOOTER_SIZE).ToArray();
FooterStruct footer = StructInterop.ByteArrayToStruct <FooterStruct>(footerBytes);
// Detect protocol errors
if (header.command == CMD_ERROR)
{
if (payload != null && payload.Length > 0)
{
throw HLDCProtocolException.FromCode(payload[0]);
}
else
{
throw new HLDCException("HLDC Malformed Error Message");
}
}
command = header.command;
}
