Converts a 4-byte array into an int32 - Java java.lang

Java examples for java.lang:byte Array Convert

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Description

Converts a 4-byte array into an int32

Demo Code

/**/* w ww.j  a  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;
        System.out.println(byteArrayToInt32(data, offset));
    }

    /** Converts a 4-byte array into an int32 */
    public static int byteArrayToInt32(byte[] data, int offset) {
        return (int) byteArrayToUInt32(data, offset);
    }

    /** Converts a 4-byte array into an uint32 */
    public static long byteArrayToUInt32(byte[] data, int offset) {
        if (data == null || data.length < offset + 4) {
            return 0;
        }
        long result = ((data[offset] & 0xFF) << 24)
                + ((data[offset + 1] & 0xFF) << 16)
                + ((data[offset + 2] & 0xFF) << 8)
                + (data[offset + 3] & 0xFF);

        return result;
    }
}

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