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src/java.desktop/share/classes/javax/sound/midi/MetaMessage.java

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   1 /*
   2  * Copyright (c) 1999, 2017, Oracle and/or its affiliates. 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any


 182      *
 183      * @return array containing the meta message data
 184      * @see MidiMessage#getLength
 185      */
 186     public byte[] getData() {
 187         byte[] returnedArray = new byte[dataLength];
 188         System.arraycopy(data, (length - dataLength), returnedArray, 0, dataLength);
 189         return returnedArray;
 190     }
 191 
 192     /**
 193      * Creates a new object of the same class and with the same contents as this
 194      * object.
 195      *
 196      * @return a clone of this instance
 197      */
 198     @Override
 199     public Object clone() {
 200         byte[] newData = new byte[length];
 201         System.arraycopy(data, 0, newData, 0, newData.length);
 202 
 203         MetaMessage event = new MetaMessage(newData);
 204         return event;
 205     }
 206 
 207     // HELPER METHODS
 208 
 209     private int getVarIntLength(long value) {
 210         int length = 0;
 211         do {
 212             value = value >> 7;
 213             length++;
 214         } while (value > 0);
 215         return length;
 216     }
 217 
 218     private static final long mask = 0x7F;
 219 
 220     private void writeVarInt(byte[] data, int off, long value) {
 221         int shift=63; // number of bitwise left-shifts of mask
 222         // first screen out leading zeros
 223         while ((shift > 0) && ((value & (mask << shift)) == 0)) shift-=7;
 224         // then write actual values
   1 /*
   2  * Copyright (c) 1999, 2018, Oracle and/or its affiliates. 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any


 182      *
 183      * @return array containing the meta message data
 184      * @see MidiMessage#getLength
 185      */
 186     public byte[] getData() {
 187         byte[] returnedArray = new byte[dataLength];
 188         System.arraycopy(data, (length - dataLength), returnedArray, 0, dataLength);
 189         return returnedArray;
 190     }
 191 
 192     /**
 193      * Creates a new object of the same class and with the same contents as this
 194      * object.
 195      *
 196      * @return a clone of this instance
 197      */
 198     @Override
 199     public Object clone() {
 200         byte[] newData = new byte[length];
 201         System.arraycopy(data, 0, newData, 0, newData.length);
 202         return new MetaMessage(newData);


 203     }
 204 
 205     // HELPER METHODS
 206 
 207     private int getVarIntLength(long value) {
 208         int length = 0;
 209         do {
 210             value = value >> 7;
 211             length++;
 212         } while (value > 0);
 213         return length;
 214     }
 215 
 216     private static final long mask = 0x7F;
 217 
 218     private void writeVarInt(byte[] data, int off, long value) {
 219         int shift=63; // number of bitwise left-shifts of mask
 220         // first screen out leading zeros
 221         while ((shift > 0) && ((value & (mask << shift)) == 0)) shift-=7;
 222         // then write actual values
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