Mega Code Archive
Encodes an integer into up to 4 bytes in network byte order in the supplied buffer
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/*
* 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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