HexBinary


1   /*
2    * Copyright 2003, 2004  The Apache Software Foundation
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  
16   */
17  package org.apache.ws.jaxme.util;
18  
19  /** <p>Utility class for xs:hexbinary.</p>
20   */
21  public class HexBinary {
22      /** Creates a clone of the given byte array.
23       */
24      public static byte[] getClone(byte[] pHexBinary) {
25          byte[] result = new byte[pHexBinary.length];
26          System.arraycopy(pHexBinary, 0, result, 0, pHexBinary.length);
27          return result;
28      }
29  
30      /** Converts the string <code>pValue</code> into an
31       * array of hex bytes.
32       */
33      public static byte[] decode(String   pValue) {
34          if ((pValue.length() % 2) != 0) {
35              throw new IllegalArgumentException  ("A HexBinary string must have even length.");
36          }
37          byte[] result = new byte[pValue.length() / 2];
38          int j = 0;
39          for (int i = 0;  i < pValue.length();  ) {
40              byte b;
41              char c = pValue.charAt(i++);
42              char d = pValue.charAt(i++);
43              if (c >= '0'  &&  c <= '9') {
44                  b = (byte) ((c - '0') << 4);
45              } else if (c >= 'A'  &&  c <= 'F') {
46                  b = (byte) ((c - 'A' + 10) << 4);
47              } else if (c >= 'a'  &&  c <= 'f') {
48                  b = (byte) ((c - 'a' + 10) << 4);
49              } else {
50                  throw new IllegalArgumentException  ("Invalid hex digit: " + c);
51              }
52              if (d >= '0'  &&  d <= '9') {
53                  b += (byte) (d - '0');
54              } else if (d >= 'A'  &&  d <= 'F') {
55                  b += (byte) (d - 'A' + 10);
56              } else if (d >= 'a'  &&  d <= 'f') {
57                  b += (byte) (d - 'a' + 10);
58              } else {
59                  throw new IllegalArgumentException  ("Invalid hex digit: " + d);
60              }
61              result[j++] = b;
62          }
63          return result;
64      }
65  
66      /** Converts the byte array <code>pHexBinary</code> into
67       * a string.
68       */
69      public static String   encode(byte[] pHexBinary) {
70          StringBuffer   result = new StringBuffer  ();
71          for (int i = 0;  i < pHexBinary.length;  i++) {
72              byte b = pHexBinary[i];
73              byte c = (byte) ((b & 0xf0) >> 4);
74              if (c <= 9) {
75                  result.append((char) ('0' + c));
76              } else {
77                  result.append((char) ('A' + c - 10));
78              }
79              c = (byte) (b & 0x0f);
80              if (c <= 9) {
81                  result.append((char) ('0' + c));
82              } else {
83                  result.append((char) ('A' + c - 10));
84              }
85          }
86          return result.toString();
87      }
88  }
89
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