J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* @test |
| 25 | * @bug 4450867 |
| 26 | * @summary Although technically the behavior of ObjectInputStream following a |
| 27 | * UTFDataFormatException is unspecified, verify that |
| 28 | * ObjectInputStream consumes at most the expected number of utf |
| 29 | * bytes, even if the last byte(s) of the utf string indicate that the |
| 30 | * string overflows its expected length. |
| 31 | */ |
| 32 | |
| 33 | import java.io.*; |
| 34 | import java.util.Random; |
| 35 | |
| 36 | public class CorruptedUTFConsumption { |
| 37 | |
| 38 | static Random rand = new Random(System.currentTimeMillis()); |
| 39 | |
| 40 | public static void main(String[] args) throws Exception { |
| 41 | StringBuffer sbuf = new StringBuffer(); |
| 42 | ByteArrayOutputStream bout = new ByteArrayOutputStream(); |
| 43 | DataOutputStream dout = new DataOutputStream(bout); |
| 44 | |
| 45 | for (int i = 0; i < 1200; i++) { |
| 46 | sbuf.append(i % 10); |
| 47 | bout.reset(); |
| 48 | dout.writeUTF(sbuf.toString()); |
| 49 | byte[] utf = bout.toByteArray(); |
| 50 | |
| 51 | // set last byte to first byte of 2-char sequence |
| 52 | utf[utf.length - 1] = (byte) (0xC0 | rand.nextInt() & 0x1F); |
| 53 | checkConsume(utf); |
| 54 | |
| 55 | // set last byte to first byte of 3-char sequence |
| 56 | utf[utf.length - 1] = (byte) (0xE0 | rand.nextInt() & 0x0F); |
| 57 | checkConsume(utf); |
| 58 | |
| 59 | if (utf.length >= 4) { // don't touch utf length bytes |
| 60 | // set last 2 bytes to first, second byte of 3-char sequence |
| 61 | utf[utf.length - 2] = (byte) (0xE0 | rand.nextInt() & 0x0F); |
| 62 | utf[utf.length - 1] = (byte) (0x80 | rand.nextInt() & 0x3F); |
| 63 | checkConsume(utf); |
| 64 | } |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | static void checkConsume(byte[] utf) throws Exception { |
| 69 | ByteArrayOutputStream bout = new ByteArrayOutputStream(); |
| 70 | ObjectOutputStream oout = new ObjectOutputStream(bout); |
| 71 | oout.write(utf); |
| 72 | oout.writeByte(0); // leave one byte of padding |
| 73 | oout.close(); |
| 74 | ObjectInputStream oin = new ObjectInputStream( |
| 75 | new ByteArrayInputStream(bout.toByteArray())); |
| 76 | try { |
| 77 | oin.readUTF(); |
| 78 | throw new Error(); |
| 79 | } catch (UTFDataFormatException ex) { |
| 80 | } |
| 81 | // if readUTF consumed padding byte, readByte will throw EOFException |
| 82 | oin.readByte(); |
| 83 | } |
| 84 | } |