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