Java ByteBuffer to Long readLong(ByteBuffer in)

Description

read Long

License

Apache License

Declaration

public static long readLong(ByteBuffer in) 

Method Source Code

//package com.java2s;
/*// w  w  w  . j  ava 2  s  .  co m
 * 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.
 */

import java.nio.ByteBuffer;

public class Main {
    public static long readLong(byte[] bytes, int offset, int size) {
        long integer = 0;
        for (int i = offset, n = offset + size; i < n; i++) {
            integer <<= 8;
            integer |= (long) bytes[i] & 0xFF;
        }
        return integer;
    }

    public static long readLong(ByteBuffer in) {
        long integer = 0;
        int mask = 0xff;
        int shift = 0;
        for (int i = 0; i < 8; i++) {
            integer |= (in.get() << shift) & mask;
            mask = mask << 8;
            shift += 8;
        }
        return integer;
    }
}

Related

1. getUInt8(ByteBuffer b, int n)
2. getUInteger(ByteBuffer bb)
3. readLong(ByteBuffer buf, int length)
4. readLong(ByteBuffer buffer)
5. readLong(ByteBuffer buffer)
6. readLong(ByteBuffer in, final int fitInBytes)
7. readLong(ByteBuffer logBuf)
8. readLong64ls(int size, ByteBuffer byteBuf)
9. readLongArray(ByteBuffer bb)