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/*
* 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.compress.utils;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.EOFException;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import org.junit.Assert;
import org.junit.Test;
public class IOUtilsTest {
private interface StreamWrapper {
InputStream wrap(InputStream toWrap);
}
@Test
public void skipUsingSkip() throws Exception {
skip(new StreamWrapper() {
@Override
public InputStream wrap(final InputStream toWrap) {
return toWrap;
}
});
}
@Test
public void skipUsingRead() throws Exception {
skip(new StreamWrapper() {
@Override
public InputStream wrap(final InputStream toWrap) {
return new FilterInputStream(toWrap) {
@Override
public long skip(final long s) {
return 0;
}
};
}
});
}
@Test
public void skipUsingSkipAndRead() throws Exception {
skip(new StreamWrapper() {
@Override
public InputStream wrap(final InputStream toWrap) {
return new FilterInputStream(toWrap) {
boolean skipped;
@Override
public long skip(final long s) throws IOException {
if (!skipped) {
toWrap.skip(5);
skipped = true;
return 5;
}
return 0;
}
};
}
});
}
@Test
public void readFullyOnChannelReadsFully() throws IOException {
ByteBuffer b = ByteBuffer.allocate(20);
final byte[] source = new byte[20];
for (byte i = 0; i < 20; i++) {
source[i] = i;
}
readFully(source, b);
Assert.assertArrayEquals(source, b.array());
}
@Test(expected = EOFException.class)
public void readFullyOnChannelThrowsEof() throws IOException {
ByteBuffer b = ByteBuffer.allocate(21);
final byte[] source = new byte[20];
for (byte i = 0; i < 20; i++) {
source[i] = i;
}
readFully(source, b);
}
@Test(expected = IllegalArgumentException.class)
public void copyThrowsOnZeroBufferSize() throws IOException {
IOUtils.copy(new ByteArrayInputStream(new byte[0]), new ByteArrayOutputStream(), 0);
}
private static void readFully(final byte[] source, ByteBuffer b) throws IOException {
IOUtils.readFully(new ReadableByteChannel() {
private int idx;
@Override
public int read(ByteBuffer buf) {
if (idx >= source.length) {
return -1;
}
buf.put(source[idx++]);
return 1;
}
@Override
public void close() { }
@Override
public boolean isOpen() {
return true;
}
}, b);
}
private void skip(final StreamWrapper wrapper) throws Exception {
final ByteArrayInputStream in = new ByteArrayInputStream(new byte[] {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
});
final InputStream sut = wrapper.wrap(in);
Assert.assertEquals(10, IOUtils.skip(sut, 10));
Assert.assertEquals(11, sut.read());
}
}
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