J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003 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 | /* |
| 25 | * |
| 26 | * Driven by: 3GBZipFiles.sh |
| 27 | */ |
| 28 | |
| 29 | import java.io.RandomAccessFile; |
| 30 | import java.io.IOException; |
| 31 | import java.util.Random; |
| 32 | |
| 33 | public class FileBuilder { |
| 34 | private static void usageError() { |
| 35 | System.err.println("Usage: FileBuilder filetype filename filesize"); |
| 36 | System.err.println(""); |
| 37 | System.err.println("Makes a file named FILENAME of size FILESIZE."); |
| 38 | System.err.println("If FILETYPE is \"MostlyEmpty\", the file contents is mostly null bytes"); |
| 39 | System.err.println("(which might occupy no disk space if the right OS support exists)."); |
| 40 | System.err.println("If FILETYPE is \"SlightlyCompressible\", the file contents are"); |
| 41 | System.err.println("approximately 90% random data."); |
| 42 | System.exit(1); |
| 43 | } |
| 44 | |
| 45 | public static void main (String[] args) throws IOException { |
| 46 | if (args.length != 3) |
| 47 | usageError(); |
| 48 | String filetype = args[0]; |
| 49 | String filename = args[1]; |
| 50 | long filesize = Long.parseLong(args[2]); |
| 51 | |
| 52 | if (! (filetype.equals("MostlyEmpty") || |
| 53 | filetype.equals("SlightlyCompressible"))) |
| 54 | usageError(); |
| 55 | |
| 56 | RandomAccessFile raf = new RandomAccessFile(filename, "rw"); |
| 57 | |
| 58 | if (filetype.equals("SlightlyCompressible")) { |
| 59 | byte[] randomBytes = new byte[16384]; |
| 60 | byte[] nullBytes = new byte[randomBytes.length/10]; |
| 61 | Random rand = new Random(); |
| 62 | for (int i = 0; raf.length() < filesize; ++i) { |
| 63 | rand.nextBytes(randomBytes); |
| 64 | raf.write(nullBytes); |
| 65 | raf.write(randomBytes); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | // Make sure file is exactly the requested size, and that |
| 70 | // a unique identifying trailer is written. |
| 71 | byte[] filenameBytes = filename.getBytes("UTF8"); |
| 72 | raf.seek(filesize-filenameBytes.length); |
| 73 | raf.write(filenameBytes); |
| 74 | raf.setLength(filesize); |
| 75 | raf.close(); |
| 76 | } |
| 77 | } |