| /******************************************************************************* |
| * Copyright (c) 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.equinox.p2.internal.repository.tools; |
| |
| import java.io.*; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| |
| public class RepositoryUtilities { |
| |
| public static String computeMD5(File file) { |
| if (file == null || file.isDirectory() || !file.exists()) |
| return null; |
| MessageDigest md5Checker; |
| try { |
| md5Checker = MessageDigest.getInstance("MD5"); //$NON-NLS-1$ |
| } catch (NoSuchAlgorithmException e) { |
| return null; |
| } |
| InputStream fis = null; |
| try { |
| fis = new BufferedInputStream(new FileInputStream(file)); |
| int read = -1; |
| while ((read = fis.read()) != -1) { |
| md5Checker.update((byte) read); |
| } |
| byte[] digest = md5Checker.digest(); |
| StringBuffer buf = new StringBuffer(); |
| for (int i = 0; i < digest.length; i++) { |
| if ((digest[i] & 0xFF) < 0x10) |
| buf.append('0'); |
| buf.append(Integer.toHexString(digest[i] & 0xFF)); |
| } |
| return buf.toString(); |
| } catch (FileNotFoundException e) { |
| return null; |
| } catch (IOException e) { |
| return null; |
| } finally { |
| if (fis != null) |
| try { |
| fis.close(); |
| } catch (IOException e) { |
| // ignore |
| } |
| } |
| } |
| } |