endianhandler.java

来自「JAKE2用ＪＡＶＡ写的queck2的３Ｄ游戏开发引擎」· Java 代码 · 共 77 行

/*
 * AbstractEndianHandler.java
 * Copyright (C) 2003
 * 
 * $Id: EndianHandler.java,v 1.2 2004/07/08 15:58:43 hzi Exp $
 */
/*
Copyright (C) 1997-2001 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
package jake2.game;

public abstract class EndianHandler
{
	private static final int mask = 0xFF;

	abstract public float BigFloat(float f);
	abstract public short BigShort(short s);
	abstract public int BigLong(int i);
	abstract public float LittleFloat(float f);
	abstract public short LittleShort(short s);
	abstract public int LittleLong(int i);

	public static float swapFloat(float f)
	{
		int i = Float.floatToRawIntBits(f);
		i = swapInt(i);
		f = Float.intBitsToFloat(i);

		return f;
	}

	public static int swapInt(int i)
	{

		int a = i & mask;
		i >>>= 8;

		a <<= 24;

		int b = i & mask;

		i >>>= 8;
		b <<= 16;

		int c = i & mask;
		i >>>= 8;
		c <<= 8;

		return i | c | b | a;
	}

	public static short swapShort(short s)
	{
		int a = s & mask;
		a <<= 8;
		int b = (s >>> 8) & mask;

		return (short) (b | a);
	}
}