org.cryptonode.jncryptor.TrailerInputStreamTest.java Source code

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Here is the source code for org.cryptonode.jncryptor.TrailerInputStreamTest.java

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/*    Copyright 2014 Duncan Jones
 *
 * Licensed 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.cryptonode.jncryptor;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.ByteArrayInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.util.Random;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.ArrayUtils;
import org.junit.Test;

/**
 * 
 */
public class TrailerInputStreamTest {

    private static final Random RANDOM = new Random();

    /**
     * Tests a basic read.
     * 
     * @throws Exception
     */
    @Test
    public void testBasicRead() throws Exception {
        byte[] trailer = new byte[10];
        RANDOM.nextBytes(trailer);

        byte[] data = new byte[30];
        RANDOM.nextBytes(data);

        byte[] streamData = ArrayUtils.addAll(data, trailer);

        TrailerInputStream tis = new TrailerInputStream(new ByteArrayInputStream(streamData), trailer.length);

        try {

            for (int i = 0; i < 30; i++) {
                byte b = (byte) tis.read();
                assertEquals(b, data[i]);
            }

            assertEquals(-1, tis.read());
            assertArrayEquals(trailer, tis.getTrailer());

        } finally {
            tis.close();
        }
    }

    /**
     * Tests an EOF occurs if the data is too small.
     * 
     * @throws Exception
     */
    @Test(expected = EOFException.class)
    public void testEOF() throws Exception {
        TrailerInputStream tis = new TrailerInputStream(new ByteArrayInputStream(new byte[4]), 5);
        IOUtils.toByteArray(tis);
    }

    /**
     * Tests the stream copes with data that just contains the trailer.
     * 
     * @throws Exception
     */
    @Test
    public void testTrailerOnly() throws Exception {
        TrailerInputStream tis = new TrailerInputStream(new ByteArrayInputStream(new byte[5]), 5);
        byte[] result = IOUtils.toByteArray(tis);
        assertTrue(result.length == 0);
    }

    /**
     * Tests the multi-byte stream read method works correctly when the requested
     * byte length is smaller than the trailer size.
     * 
     * @throws Exception
     */
    @Test
    public void testMultiByteReadWithRequestSmallerThanTrailer() throws Exception {
        testMultiByteRead(5, 2);
    }

    /**
     * Tests the multi-byte stream read method works correctly when the requested
     * byte length is larger than the trailer size.
     * 
     * @throws Exception
     */
    @Test
    public void testMultiByteReadWithRequestLargerThanTrailer() throws Exception {
        testMultiByteRead(5, 7);
    }

    private void testMultiByteRead(int trailerSize, int readSize) throws IOException {

        byte[] inputData = new byte[10];
        RANDOM.nextBytes(inputData);

        byte[] trailerData = new byte[5];
        RANDOM.nextBytes(trailerData);

        byte[] data = ArrayUtils.addAll(inputData, trailerData);

        TrailerInputStream tis = new TrailerInputStream(new ByteArrayInputStream(data), trailerSize);
        try {
            byte[] buffer = new byte[readSize];
            IOUtils.readFully(tis, buffer);

            byte[] expectedValue = new byte[readSize];
            System.arraycopy(inputData, 0, expectedValue, 0, readSize);

            assertArrayEquals("Wrong read value", expectedValue, buffer);

            // check trailer
            while (tis.read() != -1) {
            }

            assertArrayEquals("Wrong trailer value", trailerData, tis.getTrailer());
        } finally {
            tis.close();
        }
    }

    @Test
    public void testSanity() {

        for (int i = 0; i < 10000; i++) {
            byte[] inputData = new byte[15];
            RANDOM.nextBytes(inputData);

            ByteArrayInputStream in = new ByteArrayInputStream(inputData);
            int count = 0;
            while (in.read() != -1) {
                count++;
            }

            assertTrue(count == 15);
        }

    }
}