1 package org.metricshub.ipmi.core.common;
2
3 /*-
4 * ╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲
5 * IPMI Java Client
6 * ჻჻჻჻჻჻
7 * Copyright 2023 Verax Systems, MetricsHub
8 * ჻჻჻჻჻჻
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as
11 * published by the Free Software Foundation, either version 3 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Lesser Public License for more details.
18 *
19 * You should have received a copy of the GNU General Lesser Public
20 * License along with this program. If not, see
21 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
22 * ╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱╲╱
23 */
24
25 /**
26 * Class used for reading subsequent byte subarrays from message, that is also a byte array.
27 */
28 public class MessageReader {
29
30 private final byte[] message;
31 private int pointer = 0;
32
33 /**
34 * Create new instance of {@link MessageReader}, that will operate on given message.
35 */
36 public MessageReader(byte[] message) {
37 if (message == null) {
38 throw new NullPointerException("Message cannot be null");
39 }
40
41 this.message = message;
42 }
43
44 public byte[] readNextField(int fieldLength) {
45 byte[] fieldData = new byte[fieldLength];
46 System.arraycopy(message, pointer, fieldData, 0, fieldLength);
47
48 pointer += fieldLength;
49
50 return fieldData;
51 }
52
53 }