77 lines
3.0 KiB
Java
77 lines
3.0 KiB
Java
/*
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* Copyright (c) 2003, 2011, 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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/*
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*
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* Driven by: 3GBZipFiles.sh
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*/
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import java.io.RandomAccessFile;
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import java.io.IOException;
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import java.util.Random;
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public class FileBuilder {
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private static void usageError() {
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System.err.println("Usage: FileBuilder filetype filename filesize");
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System.err.println("");
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System.err.println("Makes a file named FILENAME of size FILESIZE.");
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System.err.println("If FILETYPE is \"MostlyEmpty\", the file contents is mostly null bytes");
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System.err.println("(which might occupy no disk space if the right OS support exists).");
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System.err.println("If FILETYPE is \"SlightlyCompressible\", the file contents are");
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System.err.println("approximately 90% random data.");
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System.exit(1);
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}
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public static void main (String[] args) throws IOException {
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if (args.length != 3)
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usageError();
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String filetype = args[0];
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String filename = args[1];
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long filesize = Long.parseLong(args[2]);
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if (! (filetype.equals("MostlyEmpty") ||
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filetype.equals("SlightlyCompressible")))
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usageError();
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try (RandomAccessFile raf = new RandomAccessFile(filename, "rw")) {
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if (filetype.equals("SlightlyCompressible")) {
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byte[] randomBytes = new byte[16384];
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byte[] nullBytes = new byte[randomBytes.length/10];
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Random rand = new Random();
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for (int i = 0; raf.length() < filesize; ++i) {
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rand.nextBytes(randomBytes);
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raf.write(nullBytes);
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raf.write(randomBytes);
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}
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}
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// Make sure file is exactly the requested size, and that
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// a unique identifying trailer is written.
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byte[] filenameBytes = filename.getBytes("UTF8");
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raf.seek(filesize-filenameBytes.length);
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raf.write(filenameBytes);
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raf.setLength(filesize);
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}
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}
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}
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