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/* ByteBufferImpl.java --

   Copyright (C) 2003, 2004, 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)

any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.nio;

/**

 * @author Michael Koch (konqueror@gmx.de)

 */

final class ByteBufferHelper

{

  public static char getChar (ByteBuffer buffer, ByteOrder order)

  {

    return (char) getShort (buffer, order);

  }

  public static void putChar (ByteBuffer buffer, char value, ByteOrder order)

  {

    putShort (buffer, (short) value, order);

  }

  public static char getChar (ByteBuffer buffer, int index, ByteOrder order)

  {

    return (char) getShort (buffer, index, order);

  }

  public static void putChar (ByteBuffer buffer, int index,

                              char value, ByteOrder order)

  {

    putShort (buffer, index, (short) value, order);

  }

  public static short getShort (ByteBuffer buffer, ByteOrder order)

  {

    buffer.checkForUnderflow(2);

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        return (short) ((buffer.get() & 0xff)

                        + (buffer.get() << 8));

      }

    return (short) ((buffer.get() << 8)

                    + (buffer.get() & 0xff));

  }

  public static void putShort (ByteBuffer buffer, short value, ByteOrder order)

  {

    buffer.checkForOverflow(2);

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        buffer.put ((byte) value);

        buffer.put ((byte) (value >> 8));

      }

    else

      {

        buffer.put ((byte) (value >> 8));

        buffer.put ((byte) value);

      }

  }

  public static short getShort (ByteBuffer buffer,

                                      int index, ByteOrder order)

  {

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        return (short) ((buffer.get (index) & 0xff)

                        + (buffer.get (++index) << 8));

      }

    return (short) ((buffer.get (index) << 8)

                    + (buffer.get (++index) & 0xff));

  }

  public static void putShort (ByteBuffer buffer, int index,

                               short value, ByteOrder order)

  {

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        buffer.put (index, (byte) value);

        buffer.put (++index, (byte) (value >> 8));

      }

    else

      {

        buffer.put (index, (byte) (value >> 8));

        buffer.put (++index, (byte) value);

      }

  }

  public static int getInt (ByteBuffer buffer, ByteOrder order)

  {

    buffer.checkForUnderflow(4);

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        return ((buffer.get() & 0xff)

                + ((buffer.get() & 0xff) << 8)

                + ((buffer.get() & 0xff) << 16)

                + (buffer.get() << 24));

      }

    return (int) ((buffer.get() << 24)

                  + ((buffer.get() & 0xff) << 16)

                  + ((buffer.get() & 0xff) << 8)

                  + (buffer.get() & 0xff));

  }

  public static void putInt (ByteBuffer buffer, int value, ByteOrder order)

  {

    buffer.checkForOverflow(4);

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        buffer.put ((byte) value);

        buffer.put ((byte) (value >> 8));

        buffer.put ((byte) (value >> 16));

        buffer.put ((byte) (value >> 24));

      }

    else

      {

        buffer.put ((byte) (value >> 24));

        buffer.put ((byte) (value >> 16));

        buffer.put ((byte) (value >> 8));

        buffer.put ((byte) value);

      }

  }

  public static int getInt (ByteBuffer buffer, int index, ByteOrder order)

  {

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        return ((buffer.get (index) & 0xff)

                + ((buffer.get (++index) & 0xff) << 8)

                + ((buffer.get (++index) & 0xff) << 16)

                + (buffer.get (++index) << 24));

      }

    return ((buffer.get (index) << 24)

            + ((buffer.get (++index) & 0xff) << 16)

            + ((buffer.get (++index) & 0xff) << 8)

            + (buffer.get (++index) & 0xff));

  }

  public static void putInt (ByteBuffer buffer, int index,

                                   int value, ByteOrder order)

  {

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        buffer.put (index, (byte) value);

        buffer.put (++index, (byte) (value >> 8));

        buffer.put (++index, (byte) (value >> 16));

        buffer.put (++index, (byte) (value >> 24));

      }

    else

      {

        buffer.put (index, (byte) (value >> 24));

        buffer.put (++index, (byte) (value >> 16));

        buffer.put (++index, (byte) (value >> 8));

        buffer.put (++index, (byte) value);

      }

  }

  public static long getLong (ByteBuffer buffer, ByteOrder order)

  {

    buffer.checkForUnderflow(8);

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        return ((buffer.get() & 0xff)

                + (((buffer.get() & 0xff)) << 8)

                + (((buffer.get() & 0xff)) << 16)

                + (((buffer.get() & 0xffL)) << 24)

                + (((buffer.get() & 0xffL)) << 32)

                + (((buffer.get() & 0xffL)) << 40)

                + (((buffer.get() & 0xffL)) << 48)

                + (((long) buffer.get()) << 56));

      }

    return ((((long) buffer.get()) << 56)

            + ((buffer.get() & 0xffL) << 48)

            + ((buffer.get() & 0xffL) << 40)

            + ((buffer.get() & 0xffL) << 32)

            + ((buffer.get() & 0xffL) << 24)

            + ((buffer.get() & 0xff) << 16)

            + ((buffer.get() & 0xff) << 8)

            + (buffer.get() & 0xff));

  }

  public static void putLong (ByteBuffer buffer, long value, ByteOrder order)

  {

    buffer.checkForOverflow(8);

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        buffer.put ((byte) value);

        buffer.put ((byte) (value >> 8));

        buffer.put ((byte) (value >> 16));

        buffer.put ((byte) (value >> 24));

        buffer.put ((byte) (value >> 32));

        buffer.put ((byte) (value >> 40));

        buffer.put ((byte) (value >> 48));

        buffer.put ((byte) (value >> 56));

      }

    else

      {

        buffer.put ((byte) (value >> 56));

        buffer.put ((byte) (value >> 48));

        buffer.put ((byte) (value >> 40));

        buffer.put ((byte) (value >> 32));

        buffer.put ((byte) (value >> 24));

        buffer.put ((byte) (value >> 16));

        buffer.put ((byte) (value >> 8));

        buffer.put ((byte) value);

      }

  }

  public static long getLong (ByteBuffer buffer, int index, ByteOrder order)

  {

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        return ((buffer.get (index) & 0xff)

                + ((buffer.get (++index) & 0xff) << 8)

                + ((buffer.get (++index) & 0xff) << 16)

                + ((buffer.get (++index) & 0xffL) << 24)

                + ((buffer.get (++index) & 0xffL) << 32)

                + ((buffer.get (++index) & 0xffL) << 40)

                + ((buffer.get (++index) & 0xffL) << 48)

                + (((long) buffer.get (++index)) << 56));

      }

    return ((((long) buffer.get (index)) << 56)

            + ((buffer.get (++index) & 0xffL) << 48)

            + ((buffer.get (++index) & 0xffL) << 40)

            + ((buffer.get (++index) & 0xffL) << 32)

            + ((buffer.get (++index) & 0xffL) << 24)

            + ((buffer.get (++index) & 0xff) << 16)

            + ((buffer.get (++index) & 0xff) << 8)

            + (buffer.get (++index) & 0xff));

  }

  public static void putLong (ByteBuffer buffer, int index,

                                    long value, ByteOrder order)

  {

    if (order == ByteOrder.LITTLE_ENDIAN)

      {

        buffer.put (index, (byte) value);

        buffer.put (++index, (byte) (value >> 8));

        buffer.put (++index, (byte) (value >> 16));

        buffer.put (++index, (byte) (value >> 24));

        buffer.put (++index, (byte) (value >> 32));

        buffer.put (++index, (byte) (value >> 40));

        buffer.put (++index, (byte) (value >> 48));

        buffer.put (++index, (byte) (value >> 56));

      }

    else

      {

        buffer.put (index, (byte) (value >> 56));

        buffer.put (++index, (byte) (value >> 48));

        buffer.put (++index, (byte) (value >> 40));

        buffer.put (++index, (byte) (value >> 32));

        buffer.put (++index, (byte) (value >> 24));

        buffer.put (++index, (byte) (value >> 16));

        buffer.put (++index, (byte) (value >> 8));

        buffer.put (++index, (byte) value);

      }

  }

  public static float getFloat (ByteBuffer buffer, ByteOrder order)

  {

    return Float.intBitsToFloat (getInt (buffer, order));

  }

  public static void putFloat (ByteBuffer buffer, float value, ByteOrder order)

  {

    putInt (buffer, Float.floatToRawIntBits (value), order);

  }

  public static float getFloat (ByteBuffer buffer, int index, ByteOrder order)

  {

    return Float.intBitsToFloat (getInt (buffer, index, order));

  }

  public static void putFloat (ByteBuffer buffer, int index,

                                     float value, ByteOrder order)

  {

    putInt (buffer, index, Float.floatToRawIntBits (value), order);

  }

  public static double getDouble (ByteBuffer buffer, ByteOrder order)

  {

    return Double.longBitsToDouble (getLong (buffer, order));

  }

  public static void putDouble (ByteBuffer buffer, double value, ByteOrder order)

  {

    putLong (buffer, Double.doubleToRawLongBits (value), order);

  }

  public static double getDouble (ByteBuffer buffer, int index, ByteOrder order)

  {

    return Double.longBitsToDouble (getLong (buffer, index, order));

  }

  public static void putDouble (ByteBuffer buffer, int index,

                                double value, ByteOrder order)

  {

    putLong (buffer, index, Double.doubleToRawLongBits (value), order);

  }

} // ByteBufferHelper