Java ByteBuffer to Long getUInt(ByteBuffer buffer)

Description

get U Int

License

Open Source License

Declaration

public static long getUInt(ByteBuffer buffer) 

Method Source Code

//package com.java2s;
/*/* ww  w.jav  a2 s.com*/
 * #%L
 * Organisation: mattjlewis
 * Project:      Device I/O Zero - Core
 * Filename:     IOUtil.java  
 * 
 * This file is part of the diozero project. More information about this project
 * can be found at http://www.diozero.com/
 * %%
 * Copyright (C) 2016 - 2017 mattjlewis
 * %%
 * 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.
 * #L%
 */

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

public class Main {
    public static final ByteOrder DEFAULT_BYTE_ORDER = ByteOrder.BIG_ENDIAN;

    public static long getUInt(ByteBuffer buffer) {
        return getUInt(buffer, buffer.capacity(), DEFAULT_BYTE_ORDER);
    }

    public static long getUInt(ByteBuffer buffer, ByteOrder order) {
        return getUInt(buffer, buffer.capacity(), order);
    }

    public static long getUInt(ByteBuffer buffer, int length) {
        return getUInt(buffer, length, DEFAULT_BYTE_ORDER);
    }

    public static long getUInt(ByteBuffer buffer, int length, ByteOrder order) {
        byte[] data = new byte[length];
        buffer.get(data);

        // Normal order:
        // ((data[0] << 8) & 0xFF00) | (data[1] & 0xFF);
        // Reverse order:
        // ((data[1] << 8) & 0xFF00) | (data[0] & 0xFF);

        long val = 0;
        for (int i = 0; i < length; i++) {
            val |= (data[order == ByteOrder.LITTLE_ENDIAN ? length - i - 1 : i] & 0xff) << (8 * (length - i - 1));
        }

        return val;
    }
}

Related

1. getUInt(ByteBuffer buffer)
2. getUInt(java.nio.ByteBuffer buffer)
3. getUInt16(ByteBuffer b, int n)
4. getUInt16(ByteBuffer buffer)
5. getUInt16(ByteBuffer buffer)