aeinstaller/backend/FileChecksum.java

package net.oni2.aeinstaller.backend;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @author Christian Illy
 */
public class FileChecksum {

        /**
         * Calculate MD5 checksum of file
         * 
         * @param f
         *            File to calc checksum on
         * @return Checksum
         */
        public static byte[] calculateFileMD5(File f) {
                MessageDigest md = null;
                InputStream is = null;
                InputStream dis = null;
                byte[] md5 = null;
                try {
                        md = MessageDigest.getInstance("MD5");
                        is = new FileInputStream(f);
                        dis = new DigestInputStream(is, md);
                        byte data[] = new byte[1024];
                        while (dis.read(data) > 0) {
                        }
                        md5 = md.digest();
                } catch (NoSuchAlgorithmException e) {
                        e.printStackTrace();
                } catch (FileNotFoundException e) {
                        e.printStackTrace();
                } catch (IOException e) {
                        e.printStackTrace();
                } finally {
                        if (dis != null) {
                                try {
                                        dis.close();
                                } catch (IOException e) {
                                        e.printStackTrace();
                                }
                        }
                }
                return md5;
        }

}
Revision:	804
Committed:	Fri Apr 12 15:57:57 2013 UTC (12 years, 6 months ago) by alloc
Content type:	text/x-java
File size:	1193 byte(s)
Log Message:	AEI2.02: - Fixes #5 and #14
#	Content
1	package net.oni2.aeinstaller.backend;
2
3	import java.io.File;
4	import java.io.FileInputStream;
5	import java.io.FileNotFoundException;
6	import java.io.IOException;
7	import java.io.InputStream;
8	import java.security.DigestInputStream;
9	import java.security.MessageDigest;
10	import java.security.NoSuchAlgorithmException;
11
12	/**
13	* @author Christian Illy
14	*/
15	public class FileChecksum {
16
17	/**
18	* Calculate MD5 checksum of file
19	*
20	* @param f
21	* File to calc checksum on
22	* @return Checksum
23	*/
24	public static byte[] calculateFileMD5(File f) {
25	MessageDigest md = null;
26	InputStream is = null;
27	InputStream dis = null;
28	byte[] md5 = null;
29	try {
30	md = MessageDigest.getInstance("MD5");
31	is = new FileInputStream(f);
32	dis = new DigestInputStream(is, md);
33	byte data[] = new byte[1024];
34	while (dis.read(data) > 0) {
35	}
36	md5 = md.digest();
37	} catch (NoSuchAlgorithmException e) {
38	e.printStackTrace();
39	} catch (FileNotFoundException e) {
40	e.printStackTrace();
41	} catch (IOException e) {
42	e.printStackTrace();
43	} finally {
44	if (dis != null) {
45	try {
46	dis.close();
47	} catch (IOException e) {
48	e.printStackTrace();
49	}
50	}
51	}
52	return md5;
53	}
54
55	}