J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1998-2003 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.tools.jdi; |
| 27 | |
| 28 | import com.sun.jdi.*; |
| 29 | import java.io.IOException; |
| 30 | |
| 31 | public class Packet extends Object { |
| 32 | public final static short NoFlags = 0x0; |
| 33 | public final static short Reply = 0x80; |
| 34 | public final static short ReplyNoError = 0x0; |
| 35 | |
| 36 | static int uID = 1; |
| 37 | final static byte[] nullData = new byte[0]; |
| 38 | |
| 39 | // Note! flags, cmdSet, and cmd are all byte values. |
| 40 | // We represent them as shorts to make them easier |
| 41 | // to work with. |
| 42 | int id; |
| 43 | short flags; |
| 44 | short cmdSet; |
| 45 | short cmd; |
| 46 | short errorCode; |
| 47 | byte[] data; |
| 48 | volatile boolean replied = false; |
| 49 | |
| 50 | /** |
| 51 | * Return byte representation of the packet |
| 52 | */ |
| 53 | public byte[] toByteArray() { |
| 54 | int len = data.length + 11; |
| 55 | byte b[] = new byte[len]; |
| 56 | b[0] = (byte)((len >>> 24) & 0xff); |
| 57 | b[1] = (byte)((len >>> 16) & 0xff); |
| 58 | b[2] = (byte)((len >>> 8) & 0xff); |
| 59 | b[3] = (byte)((len >>> 0) & 0xff); |
| 60 | b[4] = (byte)((id >>> 24) & 0xff); |
| 61 | b[5] = (byte)((id >>> 16) & 0xff); |
| 62 | b[6] = (byte)((id >>> 8) & 0xff); |
| 63 | b[7] = (byte)((id >>> 0) & 0xff); |
| 64 | b[8] = (byte)flags; |
| 65 | if ((flags & Packet.Reply) == 0) { |
| 66 | b[9] = (byte)cmdSet; |
| 67 | b[10] = (byte)cmd; |
| 68 | } else { |
| 69 | b[9] = (byte)((errorCode >>> 8) & 0xff); |
| 70 | b[10] = (byte)((errorCode >>> 0) & 0xff); |
| 71 | } |
| 72 | if (data.length > 0) { |
| 73 | System.arraycopy(data, 0, b, 11, data.length); |
| 74 | } |
| 75 | return b; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Create a packet from its byte array representation |
| 80 | */ |
| 81 | public static Packet fromByteArray(byte b[]) throws IOException { |
| 82 | if (b.length < 11) { |
| 83 | throw new IOException("packet is insufficient size"); |
| 84 | } |
| 85 | |
| 86 | int b0 = b[0] & 0xff; |
| 87 | int b1 = b[1] & 0xff; |
| 88 | int b2 = b[2] & 0xff; |
| 89 | int b3 = b[3] & 0xff; |
| 90 | int len = ((b0 << 24) | (b1 << 16) | (b2 << 8) | (b3 << 0)); |
| 91 | if (len != b.length) { |
| 92 | throw new IOException("length size mis-match"); |
| 93 | } |
| 94 | |
| 95 | int b4 = b[4] & 0xff; |
| 96 | int b5 = b[5] & 0xff; |
| 97 | int b6 = b[6] & 0xff; |
| 98 | int b7 = b[7] & 0xff; |
| 99 | |
| 100 | Packet p = new Packet(); |
| 101 | p.id = ((b4 << 24) | (b5 << 16) | (b6 << 8) | (b7 << 0)); |
| 102 | |
| 103 | p.flags = (short)(b[8] & 0xff); |
| 104 | |
| 105 | if ((p.flags & Packet.Reply) == 0) { |
| 106 | p.cmdSet = (short)(b[9] & 0xff); |
| 107 | p.cmd = (short)(b[10] & 0xff); |
| 108 | } else { |
| 109 | short b9 = (short)(b[9] & 0xff); |
| 110 | short b10 = (short)(b[10] & 0xff); |
| 111 | p.errorCode = (short)((b9 << 8) + (b10 << 0)); |
| 112 | } |
| 113 | |
| 114 | p.data = new byte[b.length - 11]; |
| 115 | System.arraycopy(b, 11, p.data, 0, p.data.length); |
| 116 | return p; |
| 117 | } |
| 118 | |
| 119 | Packet() |
| 120 | { |
| 121 | id = uniqID(); |
| 122 | flags = NoFlags; |
| 123 | data = nullData; |
| 124 | } |
| 125 | |
| 126 | static synchronized private int uniqID() |
| 127 | { |
| 128 | /* |
| 129 | * JDWP spec does not require this id to be sequential and |
| 130 | * increasing, but our implementation does. See |
| 131 | * VirtualMachine.notifySuspend, for example. |
| 132 | */ |
| 133 | return uID++; |
| 134 | } |
| 135 | } |