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/*
* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.ByteArrayInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Random;
import jdk.test.lib.RandomFactory;
/*
* @test
* @bug 8080835 8139206
* @library /test/lib
* @build jdk.test.lib.RandomFactory
* @run main ReadNBytes
* @summary Basic test for InputStream.readNBytes
* @key randomness
*/
public class ReadNBytes {
private static Random generator = RandomFactory.getRandom();
public static void main(String[] args) throws IOException {
test(new byte[]{1, 2, 3});
test(createRandomBytes(1024));
for (int shift : new int[] {13, 15, 17}) {
for (int offset : new int[] {-1, 0, 1}) {
test(createRandomBytes((1 << shift) + offset));
}
}
test(-1);
test(0);
for (int shift : new int[] {13, 15, 17}) {
for (int offset : new int[] {-1, 0, 1}) {
test((1 << shift) + offset);
}
}
}
static void test(byte[] inputBytes) throws IOException {
int length = inputBytes.length;
WrapperInputStream in = new WrapperInputStream(new ByteArrayInputStream(inputBytes));
byte[] readBytes = new byte[(length / 2) + 1];
int nread = in.readNBytes(readBytes, 0, readBytes.length);
int x;
byte[] tmp;
check(nread == readBytes.length,
"Expected number of bytes read: " + readBytes.length + ", got: " + nread);
check(Arrays.equals((tmp = Arrays.copyOf(inputBytes, nread)), readBytes),
"Expected[" + tmp + "], got:[" + readBytes + "]");
check(!in.isClosed(), "Stream unexpectedly closed");
// Read again
nread = in.readNBytes(readBytes, 0, readBytes.length);
check(nread == length - readBytes.length,
"Expected number of bytes read: " + (length - readBytes.length) + ", got: " + nread);
check(Arrays.equals((tmp = Arrays.copyOfRange(inputBytes, readBytes.length, length)),
Arrays.copyOf(readBytes, nread)),
"Expected[" + tmp + "], got:[" + readBytes + "]");
// Expect end of stream
check((x = in.read()) == -1,
"Expected end of stream from read(), got " + x);
check((x = in.read(tmp)) == -1,
"Expected end of stream from read(byte[]), got " + x);
check((x = in.read(tmp, 0, tmp.length)) == -1,
"Expected end of stream from read(byte[], int, int), got " + x);
check((x = in.readNBytes(tmp, 0, tmp.length)) == 0,
"Expected end of stream, 0, from readNBytes(byte[], int, int), got " + x);
check(!in.isClosed(), "Stream unexpectedly closed");
}
static void test(int max) throws IOException {
byte[] inputBytes = max <= 0 ? new byte[0] : createRandomBytes(max);
WrapperInputStream in =
new WrapperInputStream(new ByteArrayInputStream(inputBytes));
if (max < 0) {
try {
in.readNBytes(max);
check(false, "Expected IllegalArgumentException not thrown");
} catch (IllegalArgumentException iae) {
return;
}
} else if (max == 0) {
int x;
check((x = in.readNBytes(max).length) == 0,
"Expected zero bytes, got " + x);
return;
}
int off = Math.toIntExact(in.skip(generator.nextInt(max/2)));
int len = generator.nextInt(max - 1 - off);
byte[] readBytes = in.readNBytes(len);
check(readBytes.length == len,
"Expected " + len + " bytes, got " + readBytes.length);
check(Arrays.equals(inputBytes, off, off + len, readBytes, 0, len),
"Expected[" + Arrays.copyOfRange(inputBytes, off, off + len) +
"], got:[" + readBytes + "]");
int remaining = max - (off + len);
readBytes = in.readNBytes(remaining);
check(readBytes.length == remaining,
"Expected " + remaining + "bytes, got " + readBytes.length);
check(Arrays.equals(inputBytes, off + len, max,
readBytes, 0, remaining),
"Expected[" + Arrays.copyOfRange(inputBytes, off + len, max) +
"], got:[" + readBytes + "]");
check(!in.isClosed(), "Stream unexpectedly closed");
}
static byte[] createRandomBytes(int size) {
byte[] bytes = new byte[size];
generator.nextBytes(bytes);
return bytes;
}
static void check(boolean cond, Object ... failedArgs) {
if (cond)
return;
StringBuilder sb = new StringBuilder();
for (Object o : failedArgs)
sb.append(o);
throw new RuntimeException(sb.toString());
}
static class WrapperInputStream extends FilterInputStream {
private boolean closed;
WrapperInputStream(InputStream in) { super(in); }
@Override public void close() throws IOException { closed = true; in.close(); }
boolean isClosed() { return closed; }
}
}
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