Java Array Unpack unpackInt(byte[] data, int offset)

Description

Unpack an int stored as MSB first in a byte array

License

Apache License

Parameter

Parameter	Description
data	Array from which to extract the int
offset	Offset in the array where the int is stored

Declaration

private static int unpackInt(byte[] data, int offset) 

Method Source Code

//package com.java2s;
/*/*from  w  w  w .  j  a  va2s  . c  om*/
 * Copyright 2012-2013 Mathias Herberts
 *
 *    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.
 */

public class Main {
    /**
     * Unpack an int stored as MSB first in a byte array
     * @param data Array from which to extract the int
     * @param offset Offset in the array where the int is stored
     * @return
     */
    private static int unpackInt(byte[] data, int offset) {
        int value = 0;
        value |= (data[offset] << 24) & 0xff000000;
        value |= (data[offset + 1] << 16) & 0x00ff0000;
        value |= (data[offset + 2] << 8) & 0x0000ff00;
        value |= data[offset + 3] & 0x000000ff;

        return value;
    }
}

Related

1. unpack(int[] sourcearray, int arraypos, int[] data, int datapos, int num, int b)
2. unpackBCD(byte[] source)
3. unpackDie(byte[] bytes)
4. UnpackFloat(byte[] bytes, float value)
5. UnpackFloatBuffer(byte[] buffer, long bytes_read, long num_loaded, float[] list)
6. unpackIntegerByWidth(int len, byte[] buf, int offset)
7. unpackLE(long aValue, byte[] aBuf, int aOffset)
8. UnpackLittle32(byte[] bytes, int integer)
9. unpackLittleEndianLong(byte[] bytes)