hotspot/test/testlibrary/jvmti/TransformUtil.java
author lana
Tue, 08 Aug 2017 22:52:18 +0000
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permissions -rw-r--r--
Merge
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/*
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 * Copyright (c) 2016, 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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public class TransformUtil {
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    public static final String BeforePattern = "this-should-be-transformed";
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    public static final String AfterPattern  = "this-has-been--transformed";
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    public static final String ParentCheckPattern = "parent-transform-check: ";
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    public static final String ChildCheckPattern = "child-transform-check: ";
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    /**
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     * @return the number of occurrences of the <code>from</code> string that
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     * have been replaced.
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     */
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    public static int replace(byte buff[], String from, String to) {
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        if (to.length() != from.length()) {
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            throw new RuntimeException("bad strings");
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        }
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        byte f[] = asciibytes(from);
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        byte t[] = asciibytes(to);
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        byte f0 = f[0];
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        int numReplaced = 0;
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        int max = buff.length - f.length;
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        for (int i = 0; i < max; ) {
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            if (buff[i] == f0 && replace(buff, f, t, i)) {
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                i += f.length;
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                numReplaced++;
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            } else {
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                i++;
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            }
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        }
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        return numReplaced;
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    }
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    public static boolean replace(byte buff[], byte f[], byte t[], int i) {
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        for (int x = 0; x < f.length; x++) {
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            if (buff[x+i] != f[x]) {
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                return false;
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            }
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        }
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        for (int x = 0; x < f.length; x++) {
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            buff[x+i] = t[x];
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        }
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        return true;
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    }
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    static byte[] asciibytes(String s) {
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        byte b[] = new byte[s.length()];
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        for (int i = 0; i < b.length; i++) {
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            b[i] = (byte)s.charAt(i);
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        }
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        return b;
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    }
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}