345 lines
11 KiB
Java
345 lines
11 KiB
Java
/* ByteBufferImpl.java --
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Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.nio;
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/**
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* @author Michael Koch (konqueror@gmx.de)
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*/
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final class ByteBufferHelper
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{
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public static char getChar (ByteBuffer buffer, ByteOrder order)
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{
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return (char) getShort (buffer, order);
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}
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public static void putChar (ByteBuffer buffer, char value, ByteOrder order)
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{
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putShort (buffer, (short) value, order);
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}
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public static char getChar (ByteBuffer buffer, int index, ByteOrder order)
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{
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return (char) getShort (buffer, index, order);
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}
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public static void putChar (ByteBuffer buffer, int index,
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char value, ByteOrder order)
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{
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putShort (buffer, index, (short) value, order);
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}
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public static short getShort (ByteBuffer buffer, ByteOrder order)
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{
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buffer.checkForUnderflow(2);
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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return (short) ((buffer.get() & 0xff)
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+ (buffer.get() << 8));
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}
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return (short) ((buffer.get() << 8)
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+ (buffer.get() & 0xff));
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}
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public static void putShort (ByteBuffer buffer, short value, ByteOrder order)
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{
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buffer.checkForOverflow(2);
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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buffer.put ((byte) value);
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buffer.put ((byte) (value >> 8));
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}
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else
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{
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buffer.put ((byte) (value >> 8));
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buffer.put ((byte) value);
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}
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}
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public static short getShort (ByteBuffer buffer,
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int index, ByteOrder order)
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{
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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return (short) ((buffer.get (index) & 0xff)
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+ (buffer.get (++index) << 8));
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}
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return (short) ((buffer.get (index) << 8)
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+ (buffer.get (++index) & 0xff));
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}
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public static void putShort (ByteBuffer buffer, int index,
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short value, ByteOrder order)
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{
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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buffer.put (index, (byte) value);
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buffer.put (++index, (byte) (value >> 8));
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}
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else
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{
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buffer.put (index, (byte) (value >> 8));
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buffer.put (++index, (byte) value);
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}
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}
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public static int getInt (ByteBuffer buffer, ByteOrder order)
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{
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buffer.checkForUnderflow(4);
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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return ((buffer.get() & 0xff)
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+ ((buffer.get() & 0xff) << 8)
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+ ((buffer.get() & 0xff) << 16)
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+ (buffer.get() << 24));
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}
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return (int) ((buffer.get() << 24)
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+ ((buffer.get() & 0xff) << 16)
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+ ((buffer.get() & 0xff) << 8)
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+ (buffer.get() & 0xff));
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}
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public static void putInt (ByteBuffer buffer, int value, ByteOrder order)
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{
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buffer.checkForOverflow(4);
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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buffer.put ((byte) value);
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buffer.put ((byte) (value >> 8));
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buffer.put ((byte) (value >> 16));
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buffer.put ((byte) (value >> 24));
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}
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else
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{
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buffer.put ((byte) (value >> 24));
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buffer.put ((byte) (value >> 16));
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buffer.put ((byte) (value >> 8));
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buffer.put ((byte) value);
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}
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}
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public static int getInt (ByteBuffer buffer, int index, ByteOrder order)
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{
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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return ((buffer.get (index) & 0xff)
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+ ((buffer.get (++index) & 0xff) << 8)
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+ ((buffer.get (++index) & 0xff) << 16)
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+ (buffer.get (++index) << 24));
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}
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return ((buffer.get (index) << 24)
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+ ((buffer.get (++index) & 0xff) << 16)
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+ ((buffer.get (++index) & 0xff) << 8)
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+ (buffer.get (++index) & 0xff));
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}
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public static void putInt (ByteBuffer buffer, int index,
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int value, ByteOrder order)
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{
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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buffer.put (index, (byte) value);
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buffer.put (++index, (byte) (value >> 8));
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buffer.put (++index, (byte) (value >> 16));
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buffer.put (++index, (byte) (value >> 24));
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}
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else
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{
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buffer.put (index, (byte) (value >> 24));
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buffer.put (++index, (byte) (value >> 16));
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buffer.put (++index, (byte) (value >> 8));
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buffer.put (++index, (byte) value);
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}
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}
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public static long getLong (ByteBuffer buffer, ByteOrder order)
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{
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buffer.checkForUnderflow(8);
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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return ((buffer.get() & 0xff)
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+ (((buffer.get() & 0xff)) << 8)
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+ (((buffer.get() & 0xff)) << 16)
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+ (((buffer.get() & 0xffL)) << 24)
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+ (((buffer.get() & 0xffL)) << 32)
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+ (((buffer.get() & 0xffL)) << 40)
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+ (((buffer.get() & 0xffL)) << 48)
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+ (((long) buffer.get()) << 56));
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}
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return ((((long) buffer.get()) << 56)
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+ ((buffer.get() & 0xffL) << 48)
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+ ((buffer.get() & 0xffL) << 40)
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+ ((buffer.get() & 0xffL) << 32)
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+ ((buffer.get() & 0xffL) << 24)
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+ ((buffer.get() & 0xff) << 16)
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+ ((buffer.get() & 0xff) << 8)
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+ (buffer.get() & 0xff));
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}
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public static void putLong (ByteBuffer buffer, long value, ByteOrder order)
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{
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buffer.checkForOverflow(8);
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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buffer.put ((byte) value);
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buffer.put ((byte) (value >> 8));
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buffer.put ((byte) (value >> 16));
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buffer.put ((byte) (value >> 24));
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buffer.put ((byte) (value >> 32));
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buffer.put ((byte) (value >> 40));
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buffer.put ((byte) (value >> 48));
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buffer.put ((byte) (value >> 56));
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}
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else
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{
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buffer.put ((byte) (value >> 56));
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buffer.put ((byte) (value >> 48));
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buffer.put ((byte) (value >> 40));
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buffer.put ((byte) (value >> 32));
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buffer.put ((byte) (value >> 24));
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buffer.put ((byte) (value >> 16));
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buffer.put ((byte) (value >> 8));
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buffer.put ((byte) value);
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}
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}
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public static long getLong (ByteBuffer buffer, int index, ByteOrder order)
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{
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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return ((buffer.get (index) & 0xff)
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+ ((buffer.get (++index) & 0xff) << 8)
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+ ((buffer.get (++index) & 0xff) << 16)
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+ ((buffer.get (++index) & 0xffL) << 24)
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+ ((buffer.get (++index) & 0xffL) << 32)
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+ ((buffer.get (++index) & 0xffL) << 40)
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+ ((buffer.get (++index) & 0xffL) << 48)
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+ (((long) buffer.get (++index)) << 56));
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}
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return ((((long) buffer.get (index)) << 56)
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+ ((buffer.get (++index) & 0xffL) << 48)
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+ ((buffer.get (++index) & 0xffL) << 40)
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+ ((buffer.get (++index) & 0xffL) << 32)
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+ ((buffer.get (++index) & 0xffL) << 24)
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+ ((buffer.get (++index) & 0xff) << 16)
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+ ((buffer.get (++index) & 0xff) << 8)
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+ (buffer.get (++index) & 0xff));
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}
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public static void putLong (ByteBuffer buffer, int index,
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long value, ByteOrder order)
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{
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if (order == ByteOrder.LITTLE_ENDIAN)
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{
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buffer.put (index, (byte) value);
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buffer.put (++index, (byte) (value >> 8));
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buffer.put (++index, (byte) (value >> 16));
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buffer.put (++index, (byte) (value >> 24));
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buffer.put (++index, (byte) (value >> 32));
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buffer.put (++index, (byte) (value >> 40));
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buffer.put (++index, (byte) (value >> 48));
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buffer.put (++index, (byte) (value >> 56));
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}
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else
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{
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buffer.put (index, (byte) (value >> 56));
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buffer.put (++index, (byte) (value >> 48));
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buffer.put (++index, (byte) (value >> 40));
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buffer.put (++index, (byte) (value >> 32));
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buffer.put (++index, (byte) (value >> 24));
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buffer.put (++index, (byte) (value >> 16));
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buffer.put (++index, (byte) (value >> 8));
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buffer.put (++index, (byte) value);
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}
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}
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public static float getFloat (ByteBuffer buffer, ByteOrder order)
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{
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return Float.intBitsToFloat (getInt (buffer, order));
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}
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public static void putFloat (ByteBuffer buffer, float value, ByteOrder order)
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{
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putInt (buffer, Float.floatToRawIntBits (value), order);
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}
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public static float getFloat (ByteBuffer buffer, int index, ByteOrder order)
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{
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return Float.intBitsToFloat (getInt (buffer, index, order));
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}
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public static void putFloat (ByteBuffer buffer, int index,
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float value, ByteOrder order)
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{
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putInt (buffer, index, Float.floatToRawIntBits (value), order);
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}
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public static double getDouble (ByteBuffer buffer, ByteOrder order)
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{
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return Double.longBitsToDouble (getLong (buffer, order));
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}
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public static void putDouble (ByteBuffer buffer, double value, ByteOrder order)
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{
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putLong (buffer, Double.doubleToRawLongBits (value), order);
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}
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public static double getDouble (ByteBuffer buffer, int index, ByteOrder order)
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{
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return Double.longBitsToDouble (getLong (buffer, index, order));
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}
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public static void putDouble (ByteBuffer buffer, int index,
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double value, ByteOrder order)
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{
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putLong (buffer, index, Double.doubleToRawLongBits (value), order);
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}
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} // ByteBufferHelper
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