3789983e89
Reviewed-by: darcy, ihse
89 lines
3.3 KiB
Java
89 lines
3.3 KiB
Java
/*
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* Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @bug 4400571
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* @summary Verify that ObjectInputStream.available() functions properly when
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* called at the beginning of a data block, and that it does not
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* attempt any read operations that may potentially block.
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*/
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import java.io.*;
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public class Available {
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public static void main(String[] args) throws Exception {
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ObjectOutputStream oout;
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ByteArrayOutputStream bout;
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byte[] buf;
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// write stream containing short data block
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oout = new ObjectOutputStream(bout = new ByteArrayOutputStream());
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oout.write(new byte[100]);
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oout.close();
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buf = bout.toByteArray();
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// 4 byte stream header + 2 byte block header + data
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if ((getAvailable(buf, 4) != 0) || (getAvailable(buf, 5) != 0)) {
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throw new Error();
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}
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for (int i = 0; i < 100; i++) {
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if (getAvailable(buf, 6 + i) != i) {
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throw new Error();
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}
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}
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// write stream containing long data block
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oout = new ObjectOutputStream(bout = new ByteArrayOutputStream());
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oout.write(new byte[500]);
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oout.close();
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buf = bout.toByteArray();
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// 4 byte stream header + 5 byte block header + data
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for (int i = 4; i < 9; i++) {
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if (getAvailable(buf, i) != 0) {
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throw new Error();
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}
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}
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for (int i = 0; i < 500; i++) {
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if (getAvailable(buf, 9 + i) != i) {
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throw new Error();
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}
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}
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}
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/**
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* Given a byte array containing a serialized stream, creates a copy of the
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* given data truncated to the specified length, then returns the result of
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* a call to available() on an ObjectInputStream created on top of the
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* truncated data. As a side effect, a StreamCorrupted or EOFException
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* will get thrown if the available() call attempts to read past the
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* underlying stream's available data.
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*/
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static int getAvailable(byte[] data, int truncateLen) throws IOException {
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byte[] trunc = new byte[truncateLen];
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System.arraycopy(data, 0, trunc, 0, truncateLen);
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return new ObjectInputStream(
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new ByteArrayInputStream(trunc)).available();
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}
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}
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