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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tomcat.util.buf;
import java.nio.ByteBuffer;
public class ByteBufferUtils {
private ByteBufferUtils() {
// Hide the default constructor since this is a utility class.
}
/**
* Expands buffer to the given size unless it is already as big or bigger. Buffers are assumed to be in 'write to'
* mode since there would be no need to expand a buffer while it was in 'read from' mode.
*
* @param in Buffer to expand
* @param newSize The size t which the buffer should be expanded
*
* @return The expanded buffer with any data from the input buffer copied in to it or the original buffer if there
* was no need for expansion
*/
public static ByteBuffer expand(ByteBuffer in, int newSize) {
if (in.capacity() >= newSize) {
return in;
}
ByteBuffer out;
boolean direct = false;
if (in.isDirect()) {
out = ByteBuffer.allocateDirect(newSize);
direct = true;
} else {
out = ByteBuffer.allocate(newSize);
}
// Copy data
in.flip();
out.put(in);
if (direct) {
cleanDirectBuffer(in);
}
return out;
}
/**
* Clean specified direct buffer. This will cause an unavoidable warning on Java 24 and newer.
*
* @param buf the buffer to clean
*/
public static void cleanDirectBuffer(ByteBuffer buf) {
ByteBufferUtilsUnsafe.cleanDirectBuffer(buf);
}
}
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