Base16Binary


1   /**
2    *
3    *  Copyright 2004-2005 The Apache Software Foundation
4    *
5    *  Licensed under the Apache License, Version 2.0 (the "License");
6    *  you may not use this file except in compliance with the License.
7    *  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   *
15   *  See the License for the specific language governing permissions and
16   *  limitations under the License.
17   */
18  package org.apache.geronimo.interop.util;
19  
20  public class Base16Binary {
21      /**
22       * * Convert from hexadecimal string to byte array.
23       */
24      public static byte[] fromString(String   string) {
25          return fromString(string, 0, string.length());
26      }
27  
28      /**
29       * * Convert from hexadecimal string to byte array.
30       */
31      public static byte[] fromString(String   string, int offset, int length) {
32          byte[] bytes = new byte[length / 2];
33          for (int j = 0, k = 0; k < length; j++, k += 2) {
34              int hi = Character.digit(string.charAt(offset + k), 16);
35              int lo = Character.digit(string.charAt(offset + k + 1), 16);
36              if (hi == -1 || lo == -1) {
37                  throw new IllegalArgumentException  (string);
38              }
39              bytes[j] = (byte) (16 * hi + lo);
40          }
41          return bytes;
42      }
43  
44      /**
45       * * Convert from byte array to hexadecimal string.
46       */
47      public static String   toString(byte[] bytes) {
48          return toString(bytes, 0, bytes.length);
49      }
50  
51      /**
52       * * Convert from byte array to hexadecimal string.
53       */
54      public static String   toString(byte[] bytes, int offset, int length) {
55          char[] chars = new char[length * 2];
56          for (int j = 0, k = 0; j < length; j++, k += 2) {
57              int value = (bytes[offset + j] + 256) & 255;
58              chars[k] = Character.forDigit(value >> 4, 16);
59              chars[k + 1] = Character.forDigit(value & 15, 16);
60          }
61          return new String  (chars);
62      }
63  }
64
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