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/*
* Copyright (c) 2001, 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.
*/
/* @test
* @bug 4450867
* @summary Although technically the behavior of ObjectInputStream following a
* UTFDataFormatException is unspecified, verify that
* ObjectInputStream consumes at most the expected number of utf
* bytes, even if the last byte(s) of the utf string indicate that the
* string overflows its expected length.
* @key randomness
*/
import java.io.*;
import java.util.Random;
public class CorruptedUTFConsumption {
static Random rand = new Random(System.currentTimeMillis());
public static void main(String[] args) throws Exception {
StringBuffer sbuf = new StringBuffer();
ByteArrayOutputStream bout = new ByteArrayOutputStream();
DataOutputStream dout = new DataOutputStream(bout);
for (int i = 0; i < 1200; i++) {
sbuf.append(i % 10);
bout.reset();
dout.writeUTF(sbuf.toString());
byte[] utf = bout.toByteArray();
// set last byte to first byte of 2-char sequence
utf[utf.length - 1] = (byte) (0xC0 | rand.nextInt() & 0x1F);
checkConsume(utf);
// set last byte to first byte of 3-char sequence
utf[utf.length - 1] = (byte) (0xE0 | rand.nextInt() & 0x0F);
checkConsume(utf);
if (utf.length >= 4) { // don't touch utf length bytes
// set last 2 bytes to first, second byte of 3-char sequence
utf[utf.length - 2] = (byte) (0xE0 | rand.nextInt() & 0x0F);
utf[utf.length - 1] = (byte) (0x80 | rand.nextInt() & 0x3F);
checkConsume(utf);
}
}
}
static void checkConsume(byte[] utf) throws Exception {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
ObjectOutputStream oout = new ObjectOutputStream(bout);
oout.write(utf);
oout.writeByte(0); // leave one byte of padding
oout.close();
ObjectInputStream oin = new ObjectInputStream(
new ByteArrayInputStream(bout.toByteArray()));
try {
oin.readUTF();
throw new Error();
} catch (UTFDataFormatException ex) {
}
// if readUTF consumed padding byte, readByte will throw EOFException
oin.readByte();
}
}
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