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+/* JdwpPacket.java -- Base class for JDWP command and reply packets
+ Copyright (C) 2005 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.classpath.jdwp.transport;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+/**
+ * All command and reply packets in JDWP share
+ * common header type information:
+ *
+ * length (4 bytes) : size of entire packet, including length
+ * id (4 bytes) : unique packet id
+ * flags (1 byte) : flag byte
+ * [command packet stuff | reply packet stuff]
+ * data (variable) : unique command-/reply-specific data
+ *
+ * This class deal with everything except the command- and reply-specific
+ * data, which get handled in {@link
+ * gnu.classpath.jdwp.transport.JdwpCommandPacket} and {@link
+ * gnu.classpath.jdwp.transport.JdwpReplyPacket}.
+ *
+ * @author Keith Seitz <keiths@redhat.com>
+ */
+public abstract class JdwpPacket
+{
+ // Last id of packet constructed
+ protected static int _last_id = 0;
+
+ // JDWP reply packet flag
+ protected static final int JDWP_FLAG_REPLY = 0x80;
+
+ /**
+ * Minimum packet size excluding sub-class data
+ * ( length (4) + id (4) + flags (1) )
+ */
+ protected static final int MINIMUM_SIZE = 9;
+
+ /**
+ * Id of command/reply
+ */
+ protected int _id;
+
+ /**
+ * Packet flags
+ */
+ protected byte _flags;
+
+ /**
+ * Packet-specific data
+ */
+ protected byte[] _data;
+
+ /**
+ * Constructor
+ */
+ public JdwpPacket ()
+ {
+ // By default, DON'T assign an id. This way when a packet
+ // is constructed from fromBytes, _last_id won't increment (i.e.,
+ // it won't leave holes in the outgoing packet ids).
+ }
+
+ /**
+ * Constructs a <code>JdwpPacket</code> with the id
+ * from the given packet.
+ *
+ * @param pkt a packet whose id will be used in this new packet
+ */
+ public JdwpPacket (JdwpPacket pkt)
+ {
+ _id = pkt.getId ();
+ }
+
+ /**
+ * Returns the packet id
+ */
+ public int getId ()
+ {
+ return _id;
+ }
+
+ /**
+ * Sets the packet id
+ */
+ public void setId (int id)
+ {
+ _id = id;
+ }
+
+ /**
+ * Returns the packet flags
+ */
+ public byte getFlags ()
+ {
+ return _flags;
+ }
+
+ /**
+ * Sets the packet flags
+ */
+ public void setFlags (byte flags)
+ {
+ _flags = flags;
+ }
+
+ /**
+ * Gets the command/reply-specific data in this packet
+ */
+ public byte[] getData ()
+ {
+ return _data;
+ }
+
+ /**
+ * Sets the command/reply-specific data in this packet
+ */
+ public void setData (byte[] data)
+ {
+ _data = data;
+ }
+
+ /**
+ * Returns the length of this entire packet
+ */
+ public int getLength ()
+ {
+ return MINIMUM_SIZE + (_data == null ? 0 : _data.length);
+ }
+
+ /**
+ * Allow subclasses to initialize from data
+ *
+ * @param bytes packet data from the wire
+ * @param index index into <code>bytes</code> to start processing
+ * @return number of bytes in <code>bytes</code> processed
+ */
+ protected abstract int myFromBytes (byte[] bytes, int index);
+
+ /**
+ * Convert the given bytes into a <code>JdwpPacket</code>. Uses the
+ * abstract method <code>myFromBytes</code> to allow subclasses to
+ * process data.
+ *
+ * If the given data does not represent a valid JDWP packet, it returns
+ * <code>null</code>.
+ *
+ * @param bytes packet data from the wire
+ * @return number of bytes in <code>bytes</code> processed
+ */
+ public static JdwpPacket fromBytes (byte[] bytes)
+ {
+ int i = 0;
+ int length = ((bytes[i++] & 0xff) << 24 | (bytes[i++] & 0xff) << 16
+ | (bytes[i++] & 0xff) << 8 | (bytes[i++] & 0xff));
+ int id = 0;
+ byte flags = 0;
+
+ if (bytes.length == length)
+ {
+ id = ((bytes[i++] & 0xff) << 24 | (bytes[i++] & 0xff) << 16
+ | (bytes[i++] & 0xff) << 8 | (bytes[i++] & 0xff));
+ flags = bytes[i++];
+
+ Class clazz = null;
+ if (flags == 0)
+ clazz = JdwpCommandPacket.class;
+ else if ((flags & JDWP_FLAG_REPLY) != 0)
+ clazz = JdwpReplyPacket.class;
+ else
+ {
+ // Malformed packet. Discard it.
+ return null;
+ }
+
+ JdwpPacket pkt = null;
+ try
+ {
+ pkt = (JdwpPacket) clazz.newInstance ();
+ }
+ catch (InstantiationException ie)
+ {
+ // Discard packet
+ return null;
+ }
+ catch (IllegalAccessException iae)
+ {
+ // Discard packet
+ return null;
+ }
+
+ pkt.setId (id);
+ pkt.setFlags (flags);
+
+ i += pkt.myFromBytes (bytes, i);
+ byte[] data = new byte[length - i];
+ System.arraycopy (bytes, i, data, 0, data.length);
+ pkt.setData (data);
+
+ return pkt;
+ }
+
+ return null;
+ }
+
+ /**
+ * Put subclass information onto the stream
+ *
+ * @param dos the output stream to which to write
+ */
+ protected abstract void myWrite (DataOutputStream dos)
+ throws IOException;
+
+ /**
+ * Writes the packet to the output stream
+ *
+ * @param dos the output stream to which to write the packet
+ */
+ public void write (DataOutputStream dos)
+ throws IOException
+ {
+ // length
+ int length = getLength ();
+ dos.writeInt (length);
+
+ // ID
+ dos.writeInt (getId ());
+
+ // flag
+ dos.writeByte (getFlags ());
+
+ // packet-specific stuff
+ myWrite (dos);
+
+ // data (if any)
+ byte[] data = getData ();
+ if (data != null && data.length > 0)
+ dos.write (data, 0, data.length);
+ }
+}