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/*
* (C) 2002 Paul Wilkinson wilko@users.sourceforge.net
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*
* FLAPFrame.java
*
* Created on 3 May 2002, 14:51
*/
package com.wilko.jaim.flap;
/**
* @author paulw
* @version $Revision: 1.4 $
*/
public abstract class FLAPFrame {
public static final int FLAP_FRAME_SIGNON = 1;
public static final int FLAP_FRAME_DATA = 2;
public static final int FLAP_FRAME_ERROR = 3;
public static final int FLAP_FRAME_SIGNOFF = 4;
public static final int FLAP_FRAME_KEEP_ALIVE = 5;
public static final int FLAP_DATA_OFFSET = 6;
protected byte[] frame;
protected int fLen;
/**
* Creates new FLAPFrame
*/
public FLAPFrame() {
initialise();
}
protected void initialise() {
frame = new byte[8192];
frame[0] = (byte) '*';
frame[1] = 0;
frame[2] = 0;
frame[3] = 0;
frame[4] = 0;
frame[5] = 0;
fLen = 6;
}
public int getSequence() {
return ((frame[2] & 0xff) * 256 + (frame[3] & 0xff));
}
public void setSequence(int sequence) {
frame[2] = (byte) ((sequence / 256) & 0xff);
frame[3] = (byte) (sequence & 0xff);
}
public int getLength() {
return ((frame[4] & 0xff) * 256 + (frame[5] & 0xff));
}
public void setLength(int length) {
frame[4] = (byte) (length / 256);
frame[5] = (byte) (length & 0xff);
fLen = length + FLAP_DATA_OFFSET;
}
public byte[] getFrameData() {
byte[] b = new byte[fLen];
System.arraycopy(frame, 0, b, 0, fLen);
return (b);
}
protected void setFrameData(byte[] b) {
frame = new byte[b.length];
fLen = b.length;
System.arraycopy(b, 0, frame, 0, b.length);
}
public String toString() {
StringBuffer temp = new StringBuffer();
for (int i = 0; i < fLen; i++) {
int k = frame[i] & 0xff;
if (k < 16) {
temp.append("0" + Integer.toHexString(k) + " ");
} else {
temp.append(Integer.toHexString(k) + " ");
}
}
return (temp.toString());
}
public abstract int getFLAPFrameType();
}
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