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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
package org.openoffice.xmerge.util;
/**
* <p>Helper class providing static methods to convert data to/from
* Network Byte Order (Big Endian).</p>
*
* <p>With the introduction of <code>java.nio.ByteOrder</code> and
* <code>java.nio.ByteBuffer</code> in Java 1.4, it may no longer be
* necessary to use this class in the future.</p>
*
* @version 1.1
*/
public class EndianConverter {
/**
* <p>Convert a <code>short</code> to a Little Endian representation.</p>
*
* @param value The <code>short</code> to be converted.
*
* @return Two element <code>byte</code> array containing the converted
* value.
*/
public static byte[] writeShort (short value) {
byte[] leShort = new byte[2];
leShort[0] = (byte) value;
leShort[1] = (byte) (value >>> 8);
return leShort;
}
/**
* <p>Convert an integer to a Little Endian representation.</p>
*
* @param value The <code>int</code> to be converted.
*
* @return Four element <code>byte</code> array containing the converted
* value.
*/
public static byte[] writeInt (int value) {
byte[] leInt = new byte[4];
leInt[0] = (byte) value;
leInt[1] = (byte) (value >>> 8);
leInt[2] = (byte) (value >>> 16);
leInt[3] = (byte) (value >>> 24);
return leInt;
}
/**
* <p>Converts a <code>double</code> to a Little Endian representation
* of a float in IEEE-754 format.
*
* <p>An array with more than eight elements can be used, but only the first
* eight elements will be read.</p>
*
* @param value <code>double</code> containing the value to be converted
*
* @return <code>byte</code> array containing the LE representation of a IEEE-754 float
*/
public static byte[] writeDouble(double value) {
long myDouble = Double.doubleToLongBits(value);
byte[] leDouble = new byte[8];
leDouble[0] = (byte) (myDouble >>> 0);
leDouble[1] = (byte) (myDouble >>> 8);
leDouble[2] = (byte) (myDouble >>> 16);
leDouble[3] = (byte) (myDouble >>> 24);
leDouble[4] = (byte) (myDouble >>> 32);
leDouble[5] = (byte) (myDouble >>> 40);
leDouble[6] = (byte) (myDouble >>> 48);
leDouble[7] = (byte) (myDouble >>> 56);
return leDouble;
}
/**
* <p>Convert a Little Endian representation of a short to a Java
* <code>short</code> (Network Byte Order).</p>
*
* <p>An array with more than two elements can be used, but only the first
* two elements will be read.</p>
*
* @param value <code>byte</code> array containing the LE representation
* of the value.
*
* @return <code>short</code> containing the converted value.
*/
public static short readShort (byte[] value) {
int high, low;
high = value[1] & 0xFF;
low = value[0] & 0xFF;
return (short)(high << 8 | low);
}
/**
* <p>Convert a Little Endian representation of an integer to a Java
* <code>int</code> (Network Byte Order).</p>
*
* <p>An array with more than four elements can be used, but only the first
* four elements will be read.</p>
*
* @param value <code>byte</code> array containing the LE representation
* of the value.
*
* @return <code>int</code> containing the converted value.
*/
public static int readInt(byte[] value) {
int number = 0;
for (int i = 0; i < 4; i++) {
number |= (value[i] & 0xFF) << ( i * 8);
}
return number;
}
/**
* <p>Convert a Little Endian representation of a float in IEEE-754 Little
* Endian to a Java <code>double</code> (Network Byte Order).</p>
*
* <p>An array with more than eight elements can be used, but only the first
* eight elements will be read.</p>
*
* @param value <code>byte</code> array containing the LE representation
* of a IEEE-754 float.
*
* @return <code>double</code> containing the converted value.
*/
public static double readDouble(byte[] value) {
long lvalue = ( ((long)(value[7]) << 56) +
((long)(value[6]&0xFF) << 48) +
((long)(value[5]&0xFF) << 40) +
((long)(value[4]&0xFF) << 32) +
((long)(value[3]&0xFF) << 24) +
((long)(value[2]&0xFF) << 16) +
((long)(value[1]&0xFF) << 8) +
(value[0]&0xFF));
return Double.longBitsToDouble(lvalue);
}
}
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