Reads a signed 64 bit integer from an array coming from a device. - Android java.lang

Android examples for java.lang:Array Element

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Description

Reads a signed 64 bit integer from an array coming from a device.

Demo Code

/*//from w  ww. j  av a  2  s. c o  m
 * Copyright (C) 2007 The Android Open Source Project
 *
 * 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;

public class Main {
    /**
     * Reads a signed 64 bit integer from an array coming from a device.
     * @param value the array containing the int
     * @param offset the offset in the array at which the int starts
     *      Array length must be at least offset + 8
     * @return the integer read from the array
     */
    public static long swap64bitFromArray(byte[] value, int offset) {
        long v = 0;
        v |= ((long) value[offset]) & 0x00000000000000FFL;
        v |= (((long) value[offset + 1]) & 0x00000000000000FFL) << 8;
        v |= (((long) value[offset + 2]) & 0x00000000000000FFL) << 16;
        v |= (((long) value[offset + 3]) & 0x00000000000000FFL) << 24;
        v |= (((long) value[offset + 4]) & 0x00000000000000FFL) << 32;
        v |= (((long) value[offset + 5]) & 0x00000000000000FFL) << 40;
        v |= (((long) value[offset + 6]) & 0x00000000000000FFL) << 48;
        v |= (((long) value[offset + 7]) & 0x00000000000000FFL) << 56;

        return v;
    }
}

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