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osxmidi4j provides the Java MIDI API including Sysex messages for the Mac OS X platform.
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//
// Copyright (c) 2013 All Right Reserved, Pascal Collberg
//
// 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
package com.github.osxmidi4j.midiservices;

import java.util.Arrays;
import java.util.List;

import javax.sound.midi.ShortMessage;

import com.sun.jna.Pointer;
import com.sun.jna.Structure;

public class MIDIPacket extends Structure {

    public static final int EXTRA_DATA_SIZE = 6;
    public static final int DATA_SIZE = 256;
    public static final int LENGTH_SIZE = 2;
    public static final int TIMESTAMP_SIZE = 8;

    // CHECKSTYLE:OFF Visibility
    public long timeStamp;
    public short length; // NOPMD 2013-10-04 21:52
    public byte[] data = new byte[DATA_SIZE + EXTRA_DATA_SIZE];

    // CHECKSTYLE:ON

    public MIDIPacket(final int bufferSize) {
        super();
        data = new byte[bufferSize];
        length = (short) data.length; // NOPMD 2013-10-04 21:52
        allocateMemory();
    }

    public MIDIPacket(final long timeStamp, final short length, // NOPMD 2013-10-04 21:52
            final byte[] data) {
        super();
        this.timeStamp = timeStamp;
        this.length = length;
        this.data = new byte[data.length];
        System.arraycopy(data, 0, this.data, 0, data.length);
    }

    public MIDIPacket() {
        super();
    }

    public MIDIPacket(final Pointer pointer) {
        super(pointer);
    }

    public MIDIPacket(final ShortMessage msg) {
        super();
        final byte[] src =
                new byte[] {
                        (byte) msg.getStatus(), (byte) msg.getData1(),
                        (byte) msg.getData2() };
        System.arraycopy(src, 0, this.data, 0, src.length);
        length = (short) src.length; // NOPMD 2013-10-04 21:52
        timeStamp = 0;
    }

    @SuppressWarnings("rawtypes")
    protected List getFieldOrder() {
        return Arrays.asList("timeStamp", "length", "data");
    }

    public byte[] getData() {
        final byte[] buf = new byte[length];
        System.arraycopy(data, 0, buf, 0, length);
        return buf;
    }

    public long getTimeStamp() {
        return timeStamp;
    }

    public int getLength() {
        return length;
    };
}