/* | |
* Licensed to the Apache Software Foundation (ASF) under one or more | |
* contributor license agreements. See the NOTICE file distributed with | |
* this work for additional information regarding copyright ownership. | |
* The ASF licenses this file to You under the Apache License, Version 2.0 | |
* (the "License"); you may not use this file except in compliance with | |
* the License. You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package org.apache.commons.io.input; | |
import static org.junit.Assert.*; | |
import java.io.ByteArrayInputStream; | |
import java.security.MessageDigest; | |
import java.util.Random; | |
import org.junit.Test; | |
public class MessageDigestCalculatingInputStreamTest { | |
public static byte[] generateRandomByteStream(int pSize) { | |
final byte[] buffer = new byte[pSize]; | |
final Random rnd = new Random(); | |
rnd.nextBytes(buffer); | |
return buffer; | |
} | |
@Test | |
public void test() throws Exception { | |
for (int i = 256; i < 8192; i = i*2) { | |
final byte[] buffer = generateRandomByteStream(i); | |
final MessageDigest md5Sum = MessageDigest.getInstance("MD5"); | |
final byte[] expect = md5Sum.digest(buffer); | |
final MessageDigestCalculatingInputStream md5InputStream = new MessageDigestCalculatingInputStream(new ByteArrayInputStream(buffer)); | |
md5InputStream.consume(); | |
final byte[] got = md5InputStream.getMessageDigest().digest(); | |
assertArrayEquals(expect, got); | |
} | |
} | |
} |