1 /*
2 * Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com>
3 * and other copyright owners as documented in the project's IP log.
4 *
5 * This program and the accompanying materials are made available
6 * under the terms of the Eclipse Distribution License v1.0 which
7 * accompanies this distribution, is reproduced below, and is
8 * available at http://www.eclipse.org/org/documents/edl-v10.php
9 *
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * - Neither the name of the Eclipse Foundation, Inc. nor the
25 * names of its contributors may be used to endorse or promote
26 * products derived from this software without specific prior
27 * written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43 package org.eclipse.jgit.lfs.test;
44
45 import java.io.BufferedInputStream;
46 import java.io.FileNotFoundException;
47 import java.io.IOException;
48 import java.io.InputStream;
49 import java.nio.charset.StandardCharsets;
50 import java.nio.file.Files;
51 import java.nio.file.Path;
52 import java.security.MessageDigest;
53
54 import org.eclipse.jgit.lfs.lib.Constants;
55 import org.eclipse.jgit.lfs.lib.LongObjectId;
56
57 public class LongObjectIdTestUtils {
58
59 /**
60 * Create id as hash of the given string.
61 *
62 * @param s
63 * the string to hash
64 * @return id calculated by hashing string
65 */
66 public static LongObjectId hash(String s) {
67 MessageDigest md = Constants.newMessageDigest();
68 md.update(s.getBytes(StandardCharsets.UTF_8));
69 return LongObjectId.fromRaw(md.digest());
70 }
71
72 /**
73 * Create id as hash of a file content
74 *
75 * @param file
76 * the file to hash
77 * @return id calculated by hashing file content
78 * @throws FileNotFoundException
79 * if file doesn't exist
80 * @throws IOException
81 */
82 public static LongObjectId hash(Path file)
83 throws FileNotFoundException, IOException {
84 MessageDigest md = Constants.newMessageDigest();
85 try (InputStream is = new BufferedInputStream(
86 Files.newInputStream(file))) {
87 final byte[] buffer = new byte[4096];
88 for (int read = 0; (read = is.read(buffer)) != -1;) {
89 md.update(buffer, 0, read);
90 }
91 }
92 return LongObjectId.fromRaw(md.digest());
93 }
94 }