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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.http.server.util;
import org.junit.Test;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
/**
* @author <a href="mailto:einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
* @since 5.1.23
*/
public class ByteLimitedInputStreamTestCase {
private static ByteLimitedInputStream create(byte[] source, int limit) {
if (limit > source.length) {
throw new IllegalArgumentException("Limit is greater than length of source buffer.");
}
InputStream wrappedStream = new ByteArrayInputStream(source);
return new ByteLimitedInputStream(wrappedStream, limit);
}
@Test
public void requireThatBasicsWork() throws IOException {
ByteLimitedInputStream stream = create("abcdefghijklmnopqr".getBytes(StandardCharsets.US_ASCII), 9);
assertEquals(9, stream.available());
assertEquals(97, stream.read());
assertEquals(8, stream.available());
assertEquals(98, stream.read());
assertEquals(7, stream.available());
assertEquals(99, stream.read());
assertEquals(6, stream.available());
assertEquals(100, stream.read());
assertEquals(5, stream.available());
assertEquals(101, stream.read());
assertEquals(4, stream.available());
assertEquals(102, stream.read());
assertEquals(3, stream.available());
assertEquals(103, stream.read());
assertEquals(2, stream.available());
assertEquals(104, stream.read());
assertEquals(1, stream.available());
assertEquals(105, stream.read());
assertEquals(0, stream.available());
assertEquals(-1, stream.read());
assertEquals(0, stream.available());
assertEquals(-1, stream.read());
assertEquals(0, stream.available());
assertEquals(-1, stream.read());
assertEquals(0, stream.available());
assertEquals(-1, stream.read());
assertEquals(0, stream.available());
assertEquals(-1, stream.read());
assertEquals(0, stream.available());
}
@Test
public void requireThatChunkedReadWorks() throws IOException {
ByteLimitedInputStream stream = create("abcdefghijklmnopqr".getBytes(StandardCharsets.US_ASCII), 9);
assertEquals(9, stream.available());
byte[] toBuf = new byte[4];
assertEquals(4, stream.read(toBuf));
assertEquals(97, toBuf[0]);
assertEquals(98, toBuf[1]);
assertEquals(99, toBuf[2]);
assertEquals(100, toBuf[3]);
assertEquals(5, stream.available());
assertEquals(4, stream.read(toBuf));
assertEquals(101, toBuf[0]);
assertEquals(102, toBuf[1]);
assertEquals(103, toBuf[2]);
assertEquals(104, toBuf[3]);
assertEquals(1, stream.available());
assertEquals(1, stream.read(toBuf));
assertEquals(105, toBuf[0]);
assertEquals(0, stream.available());
assertEquals(-1, stream.read(toBuf));
assertEquals(0, stream.available());
}
@Test
public void requireMarkWorks() throws IOException {
InputStream stream = create("abcdefghijklmnopqr".getBytes(StandardCharsets.US_ASCII), 9);
assertEquals(97, stream.read());
assertTrue(stream.markSupported());
stream.mark(5);
assertEquals(98, stream.read());
assertEquals(99, stream.read());
stream.reset();
assertEquals(98, stream.read());
assertEquals(99, stream.read());
assertEquals(100, stream.read());
assertEquals(101, stream.read());
}
}
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