Java Convert via ByteBuffer intToByteArray(int someInt, int byteSize)

Description

Convert an int to an byte array

License

Open Source License

Parameter

Parameter	Description
someInt	int that should converted
byteSize	maximum length of the array

Return

the int as byte array

Declaration

public static byte[] intToByteArray(int someInt, int byteSize) 

Method Source Code

//package com.java2s;
/*/*from  w  w  w  . j a v a2  s. c o m*/
 * Copyright (c) 2004-2014 Frank Kubis
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is furnished
 * to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import java.nio.ByteBuffer;
import java.util.Arrays;

public class Main {
    /**
     * Convert an int to an byte array
     *
     * @param someInt  int that should converted
     * @param byteSize maximum length of the array
     *
     * @return the int as byte array
     */
    public static byte[] intToByteArray(int someInt, int byteSize) {
        if (byteSize < 0) {
            throw new RuntimeException("Invalid byte size");
        }

        ByteBuffer buff = resize(ByteBuffer.allocate(4).putInt(someInt), byteSize);

        return buff.array();
    }

    /**
     * Resize the buffer specific size, cut off the tail
     *
     * @param oldBuffer the old buffer
     * @param newSize the size of the new buffer
     *
     * @return a new buffer contains all entries of the old, but cut the end if there maximum is reached
     */
    public static ByteBuffer resize(ByteBuffer oldBuffer, int newSize) {
        ByteBuffer newBuffer = ByteBuffer.allocate(newSize);
        newSize = newSize - 1;
        int oldSize = oldBuffer.limit() - 1;
        int oldIndex = oldSize;
        int to = newSize > oldSize ? newSize - oldSize : 0;
        for (int newIndex = newSize; newIndex >= to; newIndex--) {
            newBuffer.put(newIndex, oldBuffer.get(oldIndex));
            oldIndex--;
        }

        return newBuffer;
    }

    public static byte[] resize(byte[] bytes, int newSize) {
        byte[] ret = Arrays.copyOfRange(bytes, 0, newSize);
        return ret;
    }
}

Related

1. IntToBArray(int src)
2. intToByte(int[] intArray)
3. intToByteArray(int integer)
4. intToByteArray(int l)
5. intToByteArray(int number)
6. intToBytes(final int i)
7. intToBytes(final int integer)
8. intToBytes(final int value)
9. intToBytes(final int x)