/*
* Copyright (c) Martin Schoeberl, martin@jopdesign.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Martin Schoeberl
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* Changelog:
* 2002-11-11 use LinkLayer info to mix Slip and Ethernet packets
*/
package ejip;
/**
* Packet buffer handling for a minimalistic TCP/IP stack.
*
*/
public class Packet {
public final static int MAXLLH = 7; // 7 16 bit words for ethernet
/** interface source/destination */
public LinkLayer interf;
/** place for link layer data */
public int[] llh;
/** Buffer for the ip datagram */
public int[] buf;
/** Packet length in bytes */
public int len;
/** Mark as TCP packet on the fly. Don't free it in the link layer. */
public boolean isTcpOnFly;
/**
* Create a packet with maximum length.
*/
Packet(int pktSize) {
llh = new int[MAXLLH];
buf = new int[(pktSize+3)>>2]; // DFA likes shift, but not division
len = 0;
interf = null;
}
public LinkLayer getLinkLayer() {
return interf;
}
public void setLinkLayer(LinkLayer ll) {
interf = ll;
}
/**
* Make a deep copy from Packet p. Used just for ARP requests
* with a TCP packet as the TCP packet is kept in the connection.
* @param p
*/
synchronized public void copy(Packet p) {
int i;
this.len = p.len;
this.interf = p.interf;
for (i=0; i<MAXLLH; ++i) {
this.llh[i] = p.llh[i];
}
for (i=0; i<buf.length; ++i) {
this.buf[i] = p.buf[i];
}
}
}