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Diffstat (limited to 'bundles/org.eclipse.equinox.p2.repository/src/org/eclipse/equinox/internal/p2/repository/helpers/ChecksumProducer.java')
-rw-r--r--bundles/org.eclipse.equinox.p2.repository/src/org/eclipse/equinox/internal/p2/repository/helpers/ChecksumProducer.java58
1 files changed, 30 insertions, 28 deletions
diff --git a/bundles/org.eclipse.equinox.p2.repository/src/org/eclipse/equinox/internal/p2/repository/helpers/ChecksumProducer.java b/bundles/org.eclipse.equinox.p2.repository/src/org/eclipse/equinox/internal/p2/repository/helpers/ChecksumProducer.java
index fc8cabec6..c6616eb6c 100644
--- a/bundles/org.eclipse.equinox.p2.repository/src/org/eclipse/equinox/internal/p2/repository/helpers/ChecksumProducer.java
+++ b/bundles/org.eclipse.equinox.p2.repository/src/org/eclipse/equinox/internal/p2/repository/helpers/ChecksumProducer.java
@@ -1,5 +1,5 @@
/*******************************************************************************
- * Copyright (c) 2009, 2017 IBM Corporation and others.
+ * Copyright (c) 2009, 2018 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
@@ -7,51 +7,53 @@
*
* Contributors:
* IBM Corporation - initial API and implementation
- * Mykola Nikishov - extract MD5 checksum calculation
+ * Mykola Nikishov - multiple artifact checksums
*******************************************************************************/
package org.eclipse.equinox.internal.p2.repository.helpers;
import java.io.*;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
+import java.security.*;
+/**
+ * Calculates a checksum using {@link java.security.MessageDigest}
+ */
public class ChecksumProducer {
+ private static final int BUFFER_SIZE = 4 * 1024;
+
/**
* @param file should not be <code>null</code>
* @return MD5 checksum of the file or <code>null</code> in case of NoSuchAlgorithmException
* @throws IOException
*/
+ @Deprecated
+ // bug #509401 - still here to not break x-friends like in bug #507193
public static String computeMD5(File file) throws IOException {
- InputStream fis = null;
try {
- MessageDigest md5Checker = MessageDigest.getInstance("MD5"); //$NON-NLS-1$
- fis = new BufferedInputStream(new FileInputStream(file));
- int read = -1;
- final int bufferSize = 4 * 1024;
- byte[] buffer = new byte[bufferSize];
- while ((read = fis.read(buffer, 0, bufferSize)) != -1) {
- md5Checker.update(buffer, 0, 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();
+ return produce(file, "MD5"); //$NON-NLS-1$
} catch (NoSuchAlgorithmException e) {
return null;
- } finally {
- if (fis != null)
- try {
- fis.close();
- } catch (IOException e) {
- // ignore
- }
}
}
+ /**
+ * @param file should not be <code>null</code>
+ * @param algorithm {@link java.security.MessageDigest#getInstance(String)}
+ * @return checksum of the file
+ * @throws IOException
+ * @throws NoSuchAlgorithmException
+ */
+ public static String produce(File file, String algorithm) throws IOException, NoSuchAlgorithmException {
+ MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
+ try (InputStream fis = new DigestInputStream(new BufferedInputStream(new FileInputStream(file)), messageDigest)) {
+ byte[] buffer = new byte[BUFFER_SIZE];
+ while (fis.read(buffer) != -1) {
+ // consume stream to update digest
+ }
+ }
+ byte[] digest = messageDigest.digest();
+ return ChecksumHelper.toHexString(digest);
+ }
+
}

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