Quelle TransferTo.java Sprache: JAVA

/*
* Copyright (c) 2021, 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
* @library /test/lib
* @build jdk.test.lib.RandomFactory
* @run main TransferTo
* @bug 8272297
* @summary Test FileInputStream.transferTo(FileOutputStream)
* @key randomness
*/
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.Random;
import jdk.test.lib.RandomFactory;

public class TransferTo {
    private static int MIN_SIZE      = 10_000;
    private static int MAX_SIZE_INCR = 100_000_000 - MIN_SIZE;

    private static int ITERATIONS = 10;

    private static final Random RND = RandomFactory.getRandom();

    public static void main(String[] args) throws IOException {
        File dir = new File(".");
        File in = File.createTempFile("src", ".dat", dir);
        in.deleteOnExit();

        int length = MIN_SIZE + RND.nextInt(MAX_SIZE_INCR);
        byte[] bytes = new byte[length];

        try (RandomAccessFile rafi = new RandomAccessFile(in, "rw")) {
            rafi.write(bytes);
        }

        File out = File.createTempFile("dst", ".dat", dir);
        out.deleteOnExit();

        for (int i = 0; i < ITERATIONS; i++) {
            int posIn = RND.nextInt(length);
            int posOut = RND.nextInt(MIN_SIZE);

            try (RandomAccessFile rafo = new RandomAccessFile(out, "rw")) {
                rafo.setLength(posOut);
            }

            test(in, posIn, out, posOut);

            out.delete();
            out = File.createTempFile("dst", ".dat", dir);
            out.deleteOnExit();
        }
    }

    private static void test(File in, int posIn, File out, int posOut)
        throws IOException {
        try (FileInputStream fis = new FileInputStream(in)) {
            try (FileChannel fci = fis.getChannel()) {
                fci.position(posIn);
                long size = fci.size();
                long length = size - posIn;
                int count = Math.toIntExact(length);

                try (FileOutputStream fos = new FileOutputStream(out)) {
                    try (FileChannel fco = fos.getChannel()) {
                        fco.position(posOut);

                        long transferred = fis.transferTo(fos);
                        if (transferred != count)
                            fail(posIn, size, posOut,
                                "Transferred " + transferred +
                                ", expected " + count);

                        if (fci.position() != posIn + count)
                            fail(posIn, size, posOut,
                                "Input position " + fci.position() +
                                ", expected " + posIn + count);

                        if (fco.position() != posOut + count)
                            fail(posIn, size, posOut,
                                "Output position " + fco.position() +
                                ", expected " + posOut + count);

                        byte[] bytesIn = Files.readAllBytes(in.toPath());
                        byte[] bytesOut = Files.readAllBytes(out.toPath());
                        if (!Arrays.equals(bytesIn, posIn, posIn + count,
                                           bytesOut, posOut, posOut + count))
                            fail(posIn, size, posOut, "Contents unequal");
                    }
                }
            }
        }
    }

    private static void fail(int posIn, long size, int posOut,
                             String msg) {
        System.out.printf("Failure for posIn %s, size %d, posOut %d%n",
                          posIn, size, posOut);
        throw new RuntimeException(msg);
    }
}

quality91%

¤ Dauer der Verarbeitung: 0.0 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.