1   /* Copyright 2002-2024 CS GROUP
2    * Licensed to CS GROUP (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.orekit.time;
18  
19  /** Abstract base class for CCSDS segmented and unsegmented time code.
20   * @author Luc Maisonobe
21   * @since 12.1
22   * @see AbsoluteDate
23   * @see FieldAbsoluteDate
24   */
25  abstract class AbstractCcsdsTimeCode {
26  
27      /** Decode a signed byte as an unsigned int value.
28       * @param b byte to decode
29       * @return an unsigned int value
30       */
31      protected int toUnsigned(final byte b) {
32          final int i = (int) b;
33          return (i < 0) ? 256 + i : i;
34      }
35  
36      /** Format a byte as an hex string for error messages.
37       * @param data byte to format
38       * @return a formatted string
39       */
40      protected String formatByte(final byte data) {
41          return "0x" + Integer.toHexString(data).toUpperCase();
42      }
43  
44  }