corrupt a list of ByteBuffer - Java java.nio

Java examples for java.nio:ByteBuffer

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Description

corrupt a list of ByteBuffer

Demo Code

/**// w  w  w  . j a v a2  s.c  om
 * Licensed 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 com.java2s;

import java.nio.ByteBuffer;

public class Main {
    public static void corrupt(ByteBuffer[] byteBuffers) {
        for (int i = 0; i < byteBuffers.length; i++) {
            int remaining = byteBuffers[i].remaining();

            if (remaining >= 1) {
                ByteBuffer corrupt = byteBuffers[i].duplicate();
                int index = corrupt.position()
                        + (int) (Math.random() * remaining);
                assert index >= corrupt.position()
                        && index < (corrupt.position() + remaining);
                byte data = (byte) (~corrupt.get(index) & 0xff);
                corrupt.put(index, data);
            }
        }
    }

    public static long remaining(ByteBuffer[] bufs) {
        long byteCount = 0;

        for (int i = 0; i < bufs.length; i++) {
            byteCount += bufs[i].remaining();
        }

        return byteCount;
    }

    public static ByteBuffer[] duplicate(ByteBuffer[] byteBuffers) {
        ByteBuffer[] newByteBuffers = new ByteBuffer[byteBuffers.length];

        for (int i = 0; i < byteBuffers.length; i++) {
            newByteBuffers[i] = byteBuffers[i].duplicate();
        }

        return newByteBuffers;
    }
}

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