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/*******************************************************************************
* Copyright (c) 2007, 2008 Wind River Systems, Inc. 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:
* Markus Schorn - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.core.pdom;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.OperationCanceledException;
public class Checksums {
private static final String KEY_ALGORITHM = "//algorithm//"; //$NON-NLS-1$
private static final String DEFAULT_ALGORITHM = "MD5"; //$NON-NLS-1$
/**
* Returns the default algorithm used to compute checksums.
* @throws NoSuchAlgorithmException
* @since 4.0
*/
public static MessageDigest getDefaultAlgorithm() throws NoSuchAlgorithmException {
return MessageDigest.getInstance(DEFAULT_ALGORITHM);
}
/**
* Retrieves the algorithm for computing checksums from the persisted map.
* @throws NoSuchAlgorithmException
* @since 4.0
*/
public static MessageDigest getAlgorithm(Map<String, Object> persistedMap) throws NoSuchAlgorithmException {
Object obj= persistedMap.get(KEY_ALGORITHM);
String alg= obj instanceof String ? (String) obj : DEFAULT_ALGORITHM;
return MessageDigest.getInstance(alg);
}
/**
* Stores the algorithm in a map.
* @since 4.0
*/
public static void putAlgorithm(Map<String, Object> mapToPersist, MessageDigest md) {
mapToPersist.put(KEY_ALGORITHM, md.getAlgorithm());
}
/**
* Computes the checksum for a given file.
*/
public static byte[] computeChecksum(MessageDigest md, File file) throws IOException {
md.reset();
FileInputStream fi= new FileInputStream(file);
try {
int read;
byte[] buf= new byte[1024*64];
while( (read= fi.read(buf)) >= 0) {
md.update(buf, 0, read);
}
return md.digest();
}
finally {
fi.close();
}
}
/**
* Retrieves a checksum for a file from the persisted map. May return <code>null</code>.
* @since 4.0
*/
public static byte[] getChecksum(Map<String, Object> persistedMap, IFile file) {
IPath prjRel= file.getProjectRelativePath();
Object checksum= persistedMap.get(prjRel.toString());
if (checksum instanceof byte[])
return (byte[]) checksum;
return null;
}
/**
* Stores a checksum in a map.
* @since 4.0
*/
public static void putChecksum(Map<String, Object> mapToPersist, IFile file, byte[] checksum) {
IPath prjRel= file.getProjectRelativePath();
mapToPersist.put(prjRel.toString(), checksum);
}
/**
* Creates a map to persist checksums for a project.
* @throws OperationCanceledException
* @since 4.0
*/
public static Map<String, Object> createChecksumMap(IFile[] tus, MessageDigest md, IProgressMonitor pm)
throws OperationCanceledException {
Map<String, Object> result= new HashMap<String, Object>();
putAlgorithm(result, md);
pm.beginTask(Messages.Checksums_taskComputeChecksums, tus.length);
for (IFile file : tus) {
if (pm.isCanceled()) {
throw new OperationCanceledException();
}
if (file != null) {
IPath location= file.getLocation();
if (location != null) {
File f= location.toFile();
if (f.exists()) {
try {
byte[] checksum= computeChecksum(md, f);
putChecksum(result, file, checksum);
}
catch (IOException e) {
CCorePlugin.log(e);
}
}
}
}
pm.worked(1);
}
pm.done();
return result;
}
}
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