Encodes an integer into up to 4 bytes in network byte order in the supplied buffer : byte « Data Type « Java






Encodes an integer into up to 4 bytes in network byte order in the supplied buffer

     
/*
 *  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.
 *
 */

/**
 * ByteUtilities.java - Byte manipulation functions.
 * 
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 * @since MINA 2.0.0-M3
 */     
public class Util{

    /**
     * Encodes an integer into up to 4 bytes in network byte order.
     * 
     * @param num the int to convert to a byte array
     * @param count the number of reserved bytes for the write operation
     * @return the resulting byte array
     */
    public static byte[] intToNetworkByteOrder(int num, int count) {
        byte[] buf = new byte[count];
        intToNetworkByteOrder(num, buf, 0, count);
        
        return buf;
    }
    
    /**
     * Encodes an integer into up to 4 bytes in network byte order in the 
     * supplied buffer starting at <code>start</code> offset and writing
     * <code>count</code> bytes.
     * 
     * @param num the int to convert to a byte array
     * @param buf the buffer to write the bytes to
     * @param start the offset from beginning for the write operation
     * @param count the number of reserved bytes for the write operation
     */
    public static void intToNetworkByteOrder(int num, byte[] buf, int start,
            int count) {
        if (count > 4) {
            throw new IllegalArgumentException(
                    "Cannot handle more than 4 bytes");
        }

        for (int i = count - 1; i >= 0; i--) {
            buf[start + i] = (byte) (num & 0xff);
            num >>>= 8;
        }
    }

}

   
    
    
    
    
  








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