UUIDConverter.java revision dd9eb897ee7c7b507cbdcf80263bb4b5de6966bf 
1/*
2 * Copyright 2012 Sebastian Annies, Hamburg
3 *
4 * Licensed under the Apache License, Version 2.0 (the License);
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an AS IS BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package com.googlecode.mp4parser.util;
17
18import java.nio.ByteBuffer;
19import java.nio.ByteOrder;
20import java.util.UUID;
21
22/**
23 * UUID from/to byte array.
24 */
25public class UUIDConverter {
26    public static byte[] convert(UUID uuid) {
27
28        long msb = uuid.getMostSignificantBits();
29        long lsb = uuid.getLeastSignificantBits();
30        byte[] buffer = new byte[16];
31
32        for (int i = 0; i < 8; i++) {
33            buffer[i] = (byte) (msb >>> 8 * (7 - i));
34        }
35        for (int i = 8; i < 16; i++) {
36            buffer[i] = (byte) (lsb >>> 8 * (7 - i));
37        }
38
39        return buffer;
40
41    }
42
43    public static UUID convert(byte[] uuidBytes) {
44        ByteBuffer b = ByteBuffer.wrap(uuidBytes);
45        b.order(ByteOrder.BIG_ENDIAN);
46        return new UUID(b.getLong(), b.getLong());
47    }
48}
49