// Reads a single packet from the connection, adding it to the packet
  // queue when a complete packet is ready.
  private void _readOnePacket() throws IOException {
    byte[] data = null;

    // Read in the packet
    int length = _inStream.readInt();
    if (length < 11) {
      throw new IOException("JDWP packet length < 11 (" + length + ")");
    }

    data = new byte[length];
    data[0] = (byte) (length >>> 24);
    data[1] = (byte) (length >>> 16);
    data[2] = (byte) (length >>> 8);
    data[3] = (byte) length;
    _inStream.readFully(data, 4, length - 4);

    JdwpPacket packet = JdwpPacket.fromBytes(data);
    if (packet != null) {
      synchronized (_commandQueue) {
        _commandQueue.add(packet);
        _commandQueue.notifyAll();
      }
    }
  }
  /**
   * Send an event notification to the debugger
   *
   * @param request the debugger request that wanted this event
   * @param event the event
   * @throws IOException
   */
  public void sendEvent(EventRequest request, Event event) throws IOException {
    JdwpPacket pkt;

    synchronized (_bytes) {
      _bytes.reset();
      pkt = event.toPacket(_doStream, request);
      pkt.setData(_bytes.toByteArray());
    }

    sendPacket(pkt);
  }
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  /**
   * Convert the given bytes into a <code>JdwpPacket</code>. Uses the abstract method <code>
   * myFromBytes</code> to allow subclasses to process data.
   *
   * <p>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;
  }
Esempio n. 4
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 /**
  * 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();
 }
 /**
  * Send a packet to the debugger
  *
  * @param pkt a <code>JdwpPacket</code> to send
  * @throws IOException
  */
 public void sendPacket(JdwpPacket pkt) throws IOException {
   pkt.write(_outStream);
 }