88 lines
3.3 KiB
Java
88 lines
3.3 KiB
Java
/*
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* Copyright (c) 2003, 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 4806007
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* @summary Checks for vague exceptions from writeUTF/readUTF
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* @key randomness
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*/
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import java.io.*;
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import java.util.*;
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public class ReadUTF {
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private static Random generator = new Random();
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private static final int TEST_ITERATIONS = 1000;
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private static final int A_NUMBER_NEAR_65535 = 60000;
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private static final int MAX_CORRUPTIONS_PER_CYCLE = 3;
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public static final void main(String[] args) throws Exception {
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for (int i=0; i<TEST_ITERATIONS; i++) {
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try {
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writeAndReadAString();
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} catch (UTFDataFormatException utfdfe) {
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if (utfdfe.getMessage() == null)
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throw new RuntimeException("vague exception thrown");
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} catch (EOFException eofe) {
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// These are rare and beyond the scope of the test
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}
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}
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}
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private static void writeAndReadAString() throws Exception {
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// Write out a string whose UTF-8 encoding is quite possibly
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// longer than 65535 bytes
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int length = generator.nextInt(A_NUMBER_NEAR_65535) + 1;
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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StringBuffer testBuffer = new StringBuffer();
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for (int i=0; i<length; i++)
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testBuffer.append((char)generator.nextInt());
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String testString = testBuffer.toString();
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DataOutputStream dos = new DataOutputStream(baos);
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dos.writeUTF(testString);
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// Corrupt the data to produce malformed characters
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byte[] testBytes = baos.toByteArray();
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int dataLength = testBytes.length;
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int corruptions = generator.nextInt(MAX_CORRUPTIONS_PER_CYCLE);
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for (int i=0; i<corruptions; i++) {
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int index = generator.nextInt(dataLength);
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testBytes[index] = (byte)generator.nextInt();
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}
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// Pay special attention to mangling the end to produce
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// partial characters at end
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testBytes[dataLength-1] = (byte)generator.nextInt();
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testBytes[dataLength-2] = (byte)generator.nextInt();
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// Attempt to decode the bytes back into a String
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ByteArrayInputStream bais = new ByteArrayInputStream(testBytes);
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DataInputStream dis = new DataInputStream(bais);
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dis.readUTF();
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}
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}
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