0N/A/*
2362N/A * Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
0N/A */
0N/A
0N/Apackage com.sun.tools.jdi;
0N/A
0N/Aimport com.sun.jdi.*;
0N/Aimport java.io.IOException;
0N/A
0N/Apublic class Packet extends Object {
0N/A public final static short NoFlags = 0x0;
0N/A public final static short Reply = 0x80;
0N/A public final static short ReplyNoError = 0x0;
0N/A
0N/A static int uID = 1;
0N/A final static byte[] nullData = new byte[0];
0N/A
0N/A // Note! flags, cmdSet, and cmd are all byte values.
0N/A // We represent them as shorts to make them easier
0N/A // to work with.
0N/A int id;
0N/A short flags;
0N/A short cmdSet;
0N/A short cmd;
0N/A short errorCode;
0N/A byte[] data;
0N/A volatile boolean replied = false;
0N/A
0N/A /**
0N/A * Return byte representation of the packet
0N/A */
0N/A public byte[] toByteArray() {
0N/A int len = data.length + 11;
0N/A byte b[] = new byte[len];
0N/A b[0] = (byte)((len >>> 24) & 0xff);
0N/A b[1] = (byte)((len >>> 16) & 0xff);
0N/A b[2] = (byte)((len >>> 8) & 0xff);
0N/A b[3] = (byte)((len >>> 0) & 0xff);
0N/A b[4] = (byte)((id >>> 24) & 0xff);
0N/A b[5] = (byte)((id >>> 16) & 0xff);
0N/A b[6] = (byte)((id >>> 8) & 0xff);
0N/A b[7] = (byte)((id >>> 0) & 0xff);
0N/A b[8] = (byte)flags;
0N/A if ((flags & Packet.Reply) == 0) {
0N/A b[9] = (byte)cmdSet;
0N/A b[10] = (byte)cmd;
0N/A } else {
0N/A b[9] = (byte)((errorCode >>> 8) & 0xff);
0N/A b[10] = (byte)((errorCode >>> 0) & 0xff);
0N/A }
0N/A if (data.length > 0) {
0N/A System.arraycopy(data, 0, b, 11, data.length);
0N/A }
0N/A return b;
0N/A }
0N/A
0N/A /**
0N/A * Create a packet from its byte array representation
0N/A */
0N/A public static Packet fromByteArray(byte b[]) throws IOException {
0N/A if (b.length < 11) {
0N/A throw new IOException("packet is insufficient size");
0N/A }
0N/A
0N/A int b0 = b[0] & 0xff;
0N/A int b1 = b[1] & 0xff;
0N/A int b2 = b[2] & 0xff;
0N/A int b3 = b[3] & 0xff;
0N/A int len = ((b0 << 24) | (b1 << 16) | (b2 << 8) | (b3 << 0));
0N/A if (len != b.length) {
0N/A throw new IOException("length size mis-match");
0N/A }
0N/A
0N/A int b4 = b[4] & 0xff;
0N/A int b5 = b[5] & 0xff;
0N/A int b6 = b[6] & 0xff;
0N/A int b7 = b[7] & 0xff;
0N/A
0N/A Packet p = new Packet();
0N/A p.id = ((b4 << 24) | (b5 << 16) | (b6 << 8) | (b7 << 0));
0N/A
0N/A p.flags = (short)(b[8] & 0xff);
0N/A
0N/A if ((p.flags & Packet.Reply) == 0) {
0N/A p.cmdSet = (short)(b[9] & 0xff);
0N/A p.cmd = (short)(b[10] & 0xff);
0N/A } else {
0N/A short b9 = (short)(b[9] & 0xff);
0N/A short b10 = (short)(b[10] & 0xff);
0N/A p.errorCode = (short)((b9 << 8) + (b10 << 0));
0N/A }
0N/A
0N/A p.data = new byte[b.length - 11];
0N/A System.arraycopy(b, 11, p.data, 0, p.data.length);
0N/A return p;
0N/A }
0N/A
0N/A Packet()
0N/A {
0N/A id = uniqID();
0N/A flags = NoFlags;
0N/A data = nullData;
0N/A }
0N/A
0N/A static synchronized private int uniqID()
0N/A {
0N/A /*
0N/A * JDWP spec does not require this id to be sequential and
0N/A * increasing, but our implementation does. See
0N/A * VirtualMachine.notifySuspend, for example.
0N/A */
0N/A return uID++;
0N/A }
0N/A}