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comparison src/main/java/edu/harvard/iq/dataverse/util/MD5Checksum.java @ 10:a50cf11e5178

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Rewrite LGDataverse completely upgrading to dataverse4.0
author Zoe Hong <zhong@mpiwg-berlin.mpg.de>
date Tue, 08 Sep 2015 17:00:21 +0200
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9:5926d6419569 10:a50cf11e5178
1 /*
2 * To change this license header, choose License Headers in Project Properties.
3 * To change this template file, choose Tools | Templates
4 * and open the template in the editor.
5 */
6
7 package edu.harvard.iq.dataverse.util;
8
9 import java.io.InputStream;
10 import java.io.FileInputStream;
11 import java.io.FileNotFoundException;
12 import java.io.IOException;
13 import java.security.MessageDigest;
14 import java.security.NoSuchAlgorithmException;
15
16 /**
17 * (from v.3.6)
18 * @author xyang
19 */
20 public class MD5Checksum implements java.io.Serializable {
21
22 public MD5Checksum() {
23 }
24
25 public synchronized String CalculateMD5 (String datafile) {
26
27 FileInputStream fis = null;
28 try {
29 fis = new FileInputStream(datafile);
30 } catch (FileNotFoundException ex) {
31 throw new RuntimeException(ex);
32 }
33
34 return CalculateMD5(fis);
35 /*
36 byte[] dataBytes = new byte[1024];
37
38 int nread;
39 try {
40 while ((nread = fis.read(dataBytes)) != -1) {
41 md.update(dataBytes, 0, nread);
42 }
43 } catch (IOException ex) {
44 throw new RuntimeException(ex);
45 }
46
47 byte[] mdbytes = md.digest();
48 StringBuilder sb = new StringBuilder("");
49 for (int i = 0; i < mdbytes.length; i++) {
50 sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
51 }
52 return sb.toString();
53 */
54 }
55
56 public synchronized String CalculateMD5 (InputStream in) {
57 MessageDigest md = null;
58 try {
59 md = MessageDigest.getInstance("MD5");
60 } catch (NoSuchAlgorithmException e) {
61 throw new RuntimeException(e);
62 }
63
64 byte[] dataBytes = new byte[1024];
65
66 int nread;
67 try {
68 while ((nread = in.read(dataBytes)) != -1) {
69 md.update(dataBytes, 0, nread);
70 }
71 } catch (IOException ex) {
72 throw new RuntimeException(ex);
73 } finally {
74 try {in.close();} catch (Exception e) {}
75 }
76
77 byte[] mdbytes = md.digest();
78 StringBuilder sb = new StringBuilder("");
79 for (int i = 0; i < mdbytes.length; i++) {
80 sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
81 }
82 return sb.toString();
83 }
84 }