Quelle ReadUTF.java Sprache: JAVA

/*
* Copyright (c) 2003, 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 4806007
* @summary Checks for vague exceptions from writeUTF/readUTF
* @key randomness
*/

import java.io.*;
import java.util.*;

public class ReadUTF {

    private static Random generator = new Random();

    private static final int TEST_ITERATIONS = 1000;

    private static final int A_NUMBER_NEAR_65535 = 60000;

    private static final int MAX_CORRUPTIONS_PER_CYCLE = 3;

    public static final void main(String[] args) throws Exception {
        for (int i=0; i<TEST_ITERATIONS; i++) {
            try {
                writeAndReadAString();
            } catch (UTFDataFormatException utfdfe) {
                if (utfdfe.getMessage() == null)
                    throw new RuntimeException("vague exception thrown");
            } catch (EOFException eofe) {
                // These are rare and beyond the scope of the test
            }
        }
    }

    private static void writeAndReadAString() throws Exception {
        // Write out a string whose UTF-8 encoding is quite possibly
        // longer than 65535 bytes
        int length = generator.nextInt(A_NUMBER_NEAR_65535) + 1;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        StringBuffer testBuffer = new StringBuffer();
        for (int i=0; i<length; i++)
            testBuffer.append((char)generator.nextInt());
        String testString = testBuffer.toString();
        DataOutputStream dos = new DataOutputStream(baos);
        dos.writeUTF(testString);

        // Corrupt the data to produce malformed characters
        byte[] testBytes = baos.toByteArray();
        int dataLength = testBytes.length;
        int corruptions = generator.nextInt(MAX_CORRUPTIONS_PER_CYCLE);
        for (int i=0; i<corruptions; i++) {
            int index = generator.nextInt(dataLength);
            testBytes[index] = (byte)generator.nextInt();
        }

        // Pay special attention to mangling the end to produce
        // partial characters at end
        testBytes[dataLength-1] = (byte)generator.nextInt();
        testBytes[dataLength-2] = (byte)generator.nextInt();

        // Attempt to decode the bytes back into a String
        ByteArrayInputStream bais = new ByteArrayInputStream(testBytes);
        DataInputStream dis = new DataInputStream(bais);
        dis.readUTF();
    }
}

quality90%

¤ Dauer der Verarbeitung: 0.15 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.