Converts a byte array into a long value - Java java.lang

Java examples for java.lang:byte Array Convert

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Description

Converts a byte array into a long value

Demo Code

/**//from w w w.  ja v a 2  s . c  om
 * 
 * Copyright (C) 2004-2008 FhG Fokus
 *
 * This file is part of the FhG Fokus UPnP stack - an open source UPnP implementation
 * with some additional features
 *
 * You can redistribute the FhG Fokus UPnP stack and/or modify it
 * under the terms of the GNU General Public License Version 3 as published by
 * the Free Software Foundation.
 *
 * For a license to use the FhG Fokus UPnP stack software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact Fraunhofer FOKUS by e-mail at the following
 * addresses:
 *   upnpstack@fokus.fraunhofer.de
 *
 * The FhG Fokus UPnP stack is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>
 * or write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        byte[] data = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        int offset = 2;
        int length = 2;
        System.out.println(byteArrayToInt64(data, offset, length));
    }

    /** Converts a byte array into a long value */
    public static long byteArrayToInt64(byte[] data, int offset, int length) {
        if (data == null || offset + length > data.length) {
            return 0;
        }
        long result = 0;
        for (int i = 0; i < length; i++) {
            result = (result << 8) + (data[offset + i] & 0xFF);
        }
        return result;
    }
}

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