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/*
* Copyright (c) 2020, 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.
*
* 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 jdk.jfr.event.runtime;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
/**
* Helper class for working with class files and byte arrays
*/
public final class Bytes {
public final static byte[] WORLD = Bytes.asBytes("world");
public final static byte[] EARTH = Bytes.asBytes("earth");
public static byte[] asBytes(String string) {
byte[] result = new byte[string.length()];
for (int i = 0; i < string.length(); i++) {
result[i] = (byte)string.charAt(i);
}
return result;
}
public static byte[] classBytes(ClassLoader classLoader, String className) throws IOException {
String classFileName = className.replace(".", "/") + ".class";
try (InputStream is = classLoader.getResourceAsStream(classFileName)) {
if (is == null) {
throw new IOException("Could not find class file " + classFileName);
}
return is.readAllBytes();
}
}
public static byte[] classBytes(Class<?> clazz) throws IOException {
return classBytes(clazz.getClassLoader(), clazz.getName());
}
public static byte[] replaceAll(byte[] input, byte[] target, byte[] replacement) {
List<Byte> result = new ArrayList<>();
for (int i = 0; i < input.length; i++) {
if (hasTarget(input, i, target)) {
for (int j = 0; j < replacement.length; j++) {
result.add(replacement[j]);
}
i += target.length - 1;
} else {
result.add(input[i]);
}
}
byte[] resultArray = new byte[result.size()];
for (int i = 0; i < resultArray.length; i++) {
resultArray[i] = result.get(i);
}
return resultArray;
}
private static boolean hasTarget(byte[] input, int start, byte[] target) {
for (int i = 0; i < target.length; i++) {
if (start + i == input.length) {
return false;
}
if (input[start + i] != target[i]) {
return false;
}
}
return true;
}
}
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