/**
* Copies both state and data from supplied packet to this packet by performing 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 packet source packet
* @return number of bytes copied
*/
public int transferStateAndDataFrom(JPacket packet) {
int len = packet.state.size() + packet.size();
JBuffer mem = getMemoryBuffer(len);
int o = packet.state.transferTo(mem, 0, packet.state.size(), 0);
o += packet.transferTo(mem, 0, packet.size(), o);
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);
}
