Extracts an int from an array of bytes. - Java File Path IO

Java examples for File Path IO:Byte Array

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Description

Extracts an int from an array of bytes.

Demo Code

/*//  w  w w .ja v  a  2 s .  c  o m
 * Copyright The Sett Ltd, 2005 to 2014.
 *
 * 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 {
    public static void main(String[] argv) throws Exception {
        byte[] buf = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        int offset = 2;
        System.out.println(getIntFromBytes(buf, offset));
    }

    /**
     * Extracts an int from an array of bytes.
     *
     * @param  buf    The array of bytes to extract the int from.
     * @param  offset The offset of the start of the int in the byte array.
     *
     * @return An integer extracted from the 4 bytes of data.
     */
    public static int getIntFromBytes(byte[] buf, int offset) {
        int result = 0;

        result += buf[offset++] & 0xFF;
        result += ((buf[offset++] & 0xFF) << 8);
        result += ((buf[offset++] & 0xFF) << 16);
        result += ((buf[offset]) << 24);

        return result;
    }
}

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