/**
* Initializes the packet's state and data by doing a deep copy of the contents of the buffer.
*
* @param buffer buffer containing both state and data in the form
* <pre>
* +--------------+-------------+
* | packet state | packet data |
* +--------------+-------------+
* </pre>
*/
public JMemoryPacket(JBuffer buffer) {
super(POINTER);
header.setWirelen(buffer.size());
final int len = buffer.size();
JBuffer b = getMemoryBuffer(len);
b.transferFrom(buffer); // Make a buffer to buffer copy
peer(b, 0, len);
header.setWirelen(len);
}
/**
* Performs a deep copy of the contents of the buffer into packet's internal memory buffer if that
* buffer is large enough, otherwise a new buffer is allocated. Both packet's state and data are
* then peered with the internal buffer containing the copy of the supplied buffer
*
* @param buffer buffer containing both state and data in the form
* <pre>
* +--------------+-------------+
* | packet state | packet data |
* +--------------+-------------+
* </pre>
*
* @return number of bytes copied
*/
public int transferStateAndDataFrom(JBuffer buffer) {
final int len = buffer.size();
JBuffer b = getMemoryBuffer(len);
b.transferFrom(buffer);
return peerStateAndData(b, 0);
}
/**
* Initialize the network packet from the pcap packet.
*
* @param packet The captured packet in pcap format.
*/
private void parsePcapPacket(final PcapPacket packet) {
this.length = packet.getTotalSize();
this.timestamp = new Date(packet.getCaptureHeader().timestampInMillis());
final Tcp tcp = new Tcp();
if (packet.hasHeader(tcp)) {
packet.getHeader(tcp);
this.destinationPort = tcp.destination();
this.sourcePort = tcp.source();
this.isAck = tcp.flags_ACK();
this.isRst = tcp.flags_RST();
this.isSyn = tcp.flags_SYN();
}
final Ip4 ip = new Ip4();
if (packet.hasHeader(ip)) {
packet.getHeader(ip);
this.destinationIp = FormatUtils.ip(ip.destination());
this.sourceIp = FormatUtils.ip(ip.source());
}
final JBuffer storage = new JBuffer(JMemory.Type.POINTER);
final JBuffer buffer = tcp.peerPayloadTo(storage);
if (buffer != null) {
this.data = buffer.getByteArray(0, buffer.size());
}
}
/**
* Header length.
*
* @param buffer the buffer
* @param offset the offset
* @return the int
*/
@HeaderLength
public static int headerLength(JBuffer buffer, int offset) {
return buffer.size() - offset;
}