1/*
2 *  Licensed to the Apache Software Foundation (ASF) under one or more
3 *  contributor license agreements.  See the NOTICE file distributed with
4 *  this work for additional information regarding copyright ownership.
5 *  The ASF 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
18/**
19* @author Vladimir N. Molotkov
20* @version $Revision$
21*/
22
23package org.apache.harmony.security.utils;
24
25
26/**
27 * Utility class for arrays
28 *
29 */
30public class Array {
31
32    // No instances of this class
33    private Array() {
34    }
35
36    public static String getBytesAsString(byte[] data) {
37        StringBuilder result = new StringBuilder(data.length * 3);
38        for (int i = 0; i < data.length; ++i) {
39            result.append(Byte.toHexString(data[i], false));
40            result.append(' ');
41        }
42        return result.toString();
43    }
44
45    /**
46     * Represents <code>array</code> as <code>String</code>
47     * for printing. Array length can be up to 32767
48     *
49     * @param array to be represented as <code>String</code>
50     *
51     * @return <code>String</code> representation of the <code>array</code>
52     */
53    public static String toString(byte[] array, String prefix) {
54        // Prefixes to be added to the offset values
55        // in <code>String toString(byte[], String)</code> method
56        final String[] offsetPrefix = {
57                "",
58                "000",
59                "00",
60                "0",
61                ""
62        };
63        StringBuilder sb = new StringBuilder();
64        StringBuilder charForm = new StringBuilder();
65        int i=0;
66        for (i=0; i<array.length; i++) {
67            if (i%16 == 0) {
68                sb.append(prefix);
69                // put offset
70                String offset = Integer.toHexString(i);
71                sb.append(offsetPrefix[offset.length()]);
72                sb.append(offset);
73                // clear char form for new line
74                charForm.delete(0, charForm.length());
75            }
76            // put delimiter
77            sb.append(' ');
78            // put current byte
79            sb.append(Byte.toHexString(array[i], false));
80            // form character representation part
81            int currentByte = (0xff & array[i]);
82            char currentChar = (char)(currentByte & 0xffff);
83            // FIXME if needed (how to distinguish PRINTABLE chars?)
84            charForm.append(
85                    (Character.isISOControl(currentChar) ? '.' : currentChar));
86            // Add additional delimiter for each 8 values
87            if ((i+1)%8 == 0) {
88                sb.append(' ');
89            }
90            // Add character representation for each line
91            if ((i+1)%16 == 0) {
92                sb.append(' ');
93                sb.append(charForm.toString());
94                sb.append('\n');
95            }
96        }
97        // form last line
98        if (i%16 != 0) {
99            int ws2add = 16 - i%16;
100            for (int j=0; j<ws2add; j++) {
101                sb.append("   ");
102            }
103            if (ws2add > 8) {
104                sb.append(' ');
105            }
106            sb.append("  ");
107            sb.append(charForm.toString());
108            sb.append('\n');
109        }
110        return sb.toString();
111    }
112}
113