1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 public class TransformUtil { 26 public static final String BeforePattern = "this-should-be-transformed"; 27 public static final String AfterPattern = "this-has-been--transformed"; 28 public static final String ParentCheckPattern = "parent-transform-check: "; 29 public static final String ChildCheckPattern = "child-transform-check: "; 30 31 /** 32 * @return the number of occurrences of the <code>from</code> string that 33 * have been replaced. 34 */ 35 public static int replace(byte buff[], String from, String to) { 36 if (to.length() != from.length()) { 37 throw new RuntimeException("bad strings"); 38 } 39 byte f[] = asciibytes(from); 40 byte t[] = asciibytes(to); 41 byte f0 = f[0]; 42 43 int numReplaced = 0; 44 int max = buff.length - f.length; 45 for (int i = 0; i < max; ) { 46 if (buff[i] == f0 && replace(buff, f, t, i)) { 47 i += f.length; 48 numReplaced++; 49 } else { 50 i++; 51 } 52 } 53 return numReplaced; 54 } 55 56 public static boolean replace(byte buff[], byte f[], byte t[], int i) { 57 for (int x = 0; x < f.length; x++) { 58 if (buff[x+i] != f[x]) { 59 return false; 60 } 61 } 62 for (int x = 0; x < f.length; x++) { 63 buff[x+i] = t[x]; 64 } 65 return true; 66 } 67 68 static byte[] asciibytes(String s) { 69 byte b[] = new byte[s.length()]; 70 for (int i = 0; i < b.length; i++) { 71 b[i] = (byte)s.charAt(i); 72 } 73 return b; 74 } 75 }