| /* |
| * 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package build.tools.addjsum; |
| |
| import java.io.*; |
| import java.util.regex.*; |
| |
| /** Adds a checksum ("jsum") to the end of a text file. The algorithm |
| used is known to the JVM and prevents trivial tampering with the |
| class list used for class data sharing. |
| */ |
| |
| public class AddJsum { |
| private static final long JSUM_SEED = 0xCAFEBABEBABECAFEL; |
| |
| public static void main(String[] args) throws Exception { |
| if (args.length != 2) { |
| System.err.println("Usage: java AddJsum [input file name] [output file name]"); |
| System.exit(1); |
| } |
| |
| try { |
| File inFile = new File(args[0]); |
| File outFile = new File(args[1]); |
| BufferedReader reader = new BufferedReader(new FileReader(inFile)); |
| BufferedWriter writer = new BufferedWriter(new FileWriter(outFile)); |
| Pattern p = Pattern.compile("# [0-9A-Fa-f]*"); |
| long computedJsum = JSUM_SEED; |
| |
| String line = null; |
| while ((line = reader.readLine()) != null) { |
| if (line.length() > 0 && line.charAt(0) == '#') { |
| Matcher m = p.matcher(line); |
| if (!m.matches()) { |
| writer.write(line); |
| writer.newLine(); |
| } |
| } else { |
| computedJsum = jsum(computedJsum, line); |
| writer.write(line); |
| writer.newLine(); |
| } |
| } |
| String hex = Long.toHexString(computedJsum); |
| int diff = 16 - hex.length(); |
| for (int i = 0; i < diff; i++) { |
| hex = "0" + hex; |
| } |
| writer.write("# " + hex); |
| writer.newLine(); |
| reader.close(); |
| writer.close(); |
| } catch (IOException e) { |
| System.err.println("Error reading or writing file"); |
| throw(e); |
| } |
| } |
| |
| private static long jsum(long start, String str) { |
| long h = start; |
| int len = str.length(); |
| for (int i = 0; i < len; i++) { |
| char c = str.charAt(i); |
| if (c <= ' ') { |
| /* Skip spaces and control characters */ |
| continue; |
| } |
| h = 31 * h + c; |
| } |
| return h; |
| } |
| } |