/**
* Copyright 2010 JBoss Inc
*
* 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 bitronix.tm.utils;
/**
* Number to byte array and byte array to number encoder.
* <p>© <a href="http://www.bitronix.be">Bitronix Software</a></p>
*
* @author lorban
*/
public class Encoder {
public static byte[] longToBytes(long aLong) {
byte[] array = new byte[8];
for (int i=0; i<array.length ;i++) {
array[array.length - (i+1)] = (byte) ((aLong >> (8 * i)) & 0xff);
}
return array;
}
public static byte[] intToBytes(long anInt) {
byte[] array = new byte[4];
for (int i=0; i<array.length ;i++) {
array[array.length - (i+1)] = (byte) ((anInt >> (8 * i)) & 0xff);
}
return array;
}
public static byte[] shortToBytes(short aShort) {
byte[] array = new byte[2];
for (int i=0; i<array.length ;i++) {
array[array.length - (i+1)] = (byte) ((aShort >> (8 * i)) & 0xff);
}
return array;
}
public static long bytesToLong(byte[] bytes, int pos) {
if (bytes.length + pos < 8)
throw new IllegalArgumentException("a long can only be decoded from 8 bytes of an array (got a " + bytes.length + " byte(s) array, must start at position " + pos + ")");
long result = 0;
for(int i=0; i < 8 ;i++) {
result <<= 8;
result ^= (long) bytes[i + pos] & 0xFF;
}
return result;
}
}