/**
* 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);
}
/**
* Peers the contents of the buffer directly with this packet. No copies are performed but the
* packet state and data are expected to be contained within the buffer with a certain layout as
* described below:
*
* <p>Supplied buffer layout expected:
*
* <pre>
* +-----+----+
* |State|Data|
* +-----+----+
* </pre>
*
* @param buffer buffer containing packet header, state and data
* @param offset starting offset into the buffer
* @return number of bytes peered
*/
public int peerStateAndData(JBuffer buffer, int offset) {
state.peerTo(buffer, offset, State.sizeof(0));
int o = state.peerTo(buffer, offset, State.sizeof(state.getHeaderCount()));
o += super.peer(buffer, offset + o, header.caplen());
return o;
}
/**
* Preallocates a packet with internal buffer of the supplied size.
*
* @param size number of bytes to pre allocate
*/
public JMemoryPacket(int size) {
super(size, 0);
header.setWirelen(size);
/** Bug #2878768 JMemoryPacket(int) constructor doesn't work */
super.peer(super.memory);
}
/**
* 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(byte[] buffer) {
super(Type.POINTER);
final JBuffer mem = getMemoryBuffer(buffer);
super.peer(mem);
header.setWirelen(buffer.length);
}
/**
* 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>
*
* @throws PeeringException if there is a problem peering with the buffer
*/
public JMemoryPacket(ByteBuffer buffer) throws PeeringException {
super(Type.POINTER);
final int size = buffer.limit() - buffer.position();
final JBuffer mem = getMemoryBuffer(size);
super.peer(mem);
transferFrom(buffer);
header.setWirelen(size);
}
/**
* Changes the wirelen of this packet.
*
* @param wirelen new wirelen for this packet
*/
public void setWirelen(int wirelen) {
header.setWirelen(wirelen);
}