be.lassi.lanbox.udp
Class UdpPacketParser
java.lang.Object
be.lassi.lanbox.udp.UdpPacketParser
public class UdpPacketParser
- extends java.lang.Object
Parses a Lanbox UDP packet and translates it to an UdpPacket object.
A Lanbox UDP packet consists of a 4-byte packet header followed by one or more
messages. If a message has odd length, then a padding byte is added
to make sure the next message is at a 16-bit aligned offset. This
padding may be omitted after the last message.
Packet layout:
Packet Header
16-bit cookie 0xC0B7
16-bit sequence number
DMX buffer broadcast message
8-bit message type 0xC9
8-bit source buffer id
16-bit message length (of entire message, except padding)
16-bit channel offset
n bytes of data, where n = message length - 6
Messages other than DMX buffer broadcasts are ignored
|
Constructor Summary |
UdpPacketParser(org.apache.log4j.Logger logger,
byte[] bytes,
int length)
Constructs a new parser. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
UdpPacketParser
public UdpPacketParser(org.apache.log4j.Logger logger,
byte[] bytes,
int length)
- Constructs a new parser.
- Parameters:
destination - for log messagesbytes - the UDP packet bytes to be interpretedlength - the number of bytes in the bytes buffer
getPacket
public UdpPacket getPacket()
- Gets the packet.
- Returns:
- the packet, or null if no valid packet was found
