1/*
2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24import java.io.*;
25
26class Utils {
27
28    static final String BASE = System.getProperty("test.src", ".");
29
30    private final static char[] hexDigits = "0123456789abcdef".toCharArray();
31
32    public static String toString(byte[] b) {
33        if (b == null) {
34            return "(null)";
35        }
36        StringBuffer sb = new StringBuffer(b.length * 3);
37        for (int i = 0; i < b.length; i++) {
38            int k = b[i] & 0xff;
39            if (i != 0) {
40                sb.append(':');
41            }
42            sb.append(hexDigits[k >>> 4]);
43            sb.append(hexDigits[k & 0xf]);
44        }
45        return sb.toString();
46    }
47
48    public static byte[] parse(String s) {
49        if (s.equals("(null)")) {
50            return null;
51        }
52        try {
53            int n = s.length();
54            ByteArrayOutputStream out = new ByteArrayOutputStream(n / 3);
55            StringReader r = new StringReader(s);
56            while (true) {
57                int b1 = nextNibble(r);
58                if (b1 < 0) {
59                    break;
60                }
61                int b2 = nextNibble(r);
62                if (b2 < 0) {
63                    throw new RuntimeException("Invalid string " + s);
64                }
65                int b = (b1 << 4) | b2;
66                out.write(b);
67            }
68            return out.toByteArray();
69        } catch (IOException e) {
70            throw new RuntimeException(e);
71        }
72    }
73
74    private static int nextNibble(StringReader r) throws IOException {
75        while (true) {
76            int ch = r.read();
77            if (ch == -1) {
78                return -1;
79            } else if ((ch >= '0') && (ch <= '9')) {
80                return ch - '0';
81            } else if ((ch >= 'a') && (ch <= 'f')) {
82                return ch - 'a' + 10;
83            } else if ((ch >= 'A') && (ch <= 'F')) {
84                return ch - 'A' + 10;
85            }
86        }
87    }
88
89}
90