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Checksum.java
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Checksum.java
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package hudson.remoting;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import javax.annotation.Nonnull;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Represents 128bit checksum of a jar file.
*
* @author Kohsuke Kawaguchi
*/
final class Checksum {
public final long sum1, sum2;
Checksum(long sum1, long sum2) {
this.sum1 = sum1;
this.sum2 = sum2;
}
private Checksum(byte[] arrayOf16bytes, int numOfLong) {
try {
DataInputStream in = new DataInputStream(new ByteArrayInputStream(arrayOf16bytes));
long l1=0,l2=0;
for (int i=0; i<numOfLong; i++) {
long l = in.readLong();
if (i%2==0)
l1 ^= l;
else
l2 ^= l;
}
sum1 = l1;
sum2 = l2;
} catch (IOException e) {
throw new AssertionError(e);
}
}
@Override
public boolean equals(Object o) {
if (o instanceof Checksum) {
Checksum that = (Checksum) o;
return sum1 == that.sum1 && sum2 == that.sum2;
} else
return false;
}
@Override
public int hashCode() {
long l = sum1 ^ sum2;
return (int) (l ^ (l >>> 32));
}
@Override
public String toString() {
return String.format("%016X%016X",sum1,sum2);
}
/**
* Returns the checksum for the given file.
*/
static Checksum forFile(File file) throws IOException {
return forURL(file.toURI().toURL());
}
/**
* Returns the checksum for the given URL.
*/
@SuppressFBWarnings(value = "URLCONNECTION_SSRF_FD", justification = "This is only used for managing the jar cache as files, not URLs.")
static Checksum forURL(URL url) throws IOException {
try {
MessageDigest md = MessageDigest.getInstance(JarLoaderImpl.DIGEST_ALGORITHM);
try(InputStream istream = url.openStream(); OutputStream ostream = new DigestOutputStream(new NullOutputStream(), md)) {
Util.copy(istream, ostream);
return new Checksum(md.digest(), md.getDigestLength() / 8);
}
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
}
}
private static class NullOutputStream extends OutputStream {
@Override
public void write(int b) {
}
@Override
public void write(@Nonnull byte[] b) {
}
@Override
public void write(@Nonnull byte[] b, int off, int len) {
}
}
}