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diff --git a/libjava/java/nio/MappedByteBufferImpl.java b/libjava/java/nio/MappedByteBufferImpl.java
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+++ b/libjava/java/nio/MappedByteBufferImpl.java
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+/* MappedByteBufferImpl.java -- 
+   Copyright (C) 2002, 2003, 2004 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;
+
+import gnu.gcj.RawData;
+
+import java.io.IOException;
+
+final class MappedByteBufferImpl extends MappedByteBuffer
+{
+  private final boolean readOnly;
+
+  /** Posix uses this for the pointer returned by mmap;
+   * Win32 uses it for the pointer returned by MapViewOfFile. */
+  public RawData implPtr;
+  /** Posix uses this for the actual length passed to mmap;
+   * Win32 uses it for the pointer returned by CreateFileMapping. */
+  public long implLen;
+  
+  public MappedByteBufferImpl(RawData address, int size, boolean readOnly)
+    throws IOException
+  {
+    super(size, size, 0, -1, address);
+    this.readOnly = readOnly;
+  }
+
+  public boolean isReadOnly()
+  {
+    return readOnly;
+  }
+  
+  public byte get()
+  {
+    checkForUnderflow();
+
+    int pos = position();
+    byte result = VMDirectByteBuffer.get(address, pos);
+    position(pos + 1);
+    return result;
+  }
+
+  public ByteBuffer put(byte value)
+  {
+    checkIfReadOnly();
+    checkForOverflow();
+
+    int pos = position();
+    VMDirectByteBuffer.put(address, pos, value);
+    position(pos + 1);
+    return this;
+  }
+
+  public byte get(int index)
+  {
+    checkIndex(index);
+
+    return VMDirectByteBuffer.get(address, index);
+  }
+
+  public ByteBuffer get(byte[] dst, int offset, int length)
+  {
+    checkArraySize(dst.length, offset, length);
+    checkForUnderflow(length);
+
+    int index = position();
+    VMDirectByteBuffer.get(address, index, dst, offset, length);
+    position(index+length);
+
+    return this;
+  }
+
+  public ByteBuffer put(int index, byte value)
+  {
+    checkIfReadOnly();
+    checkIndex(index);
+
+    VMDirectByteBuffer.put(address, index, value);
+    return this;
+  }
+
+  public ByteBuffer compact()
+  {
+    checkIfReadOnly();
+    mark = -1;
+    int pos = position();
+    if (pos > 0)
+      {
+	int count = remaining();
+	// Call shiftDown method optimized for direct buffers.
+	VMDirectByteBuffer.shiftDown(address, 0, pos, count);
+	position(count);
+	limit(capacity());
+      }
+    else
+      {
+	position(limit());
+	limit(capacity());
+      }
+    return this;
+  }
+
+  public boolean isDirect()
+  {
+    return true;
+  }
+
+  public ByteBuffer slice()
+  {
+    int rem = remaining();
+    if (isReadOnly())
+        return new DirectByteBufferImpl.ReadOnly
+      (this, VMDirectByteBuffer.adjustAddress(address, position()),
+       rem, rem, 0);
+    else
+        return new DirectByteBufferImpl.ReadWrite
+      (this, VMDirectByteBuffer.adjustAddress(address, position()),
+       rem, rem, 0);
+  }
+
+  private ByteBuffer duplicate(boolean readOnly)
+  {
+    int pos = position();
+    reset();
+    int mark = position();
+    position(pos);
+    DirectByteBufferImpl result;
+    if (readOnly)
+        result = new DirectByteBufferImpl.ReadOnly(this, address, capacity(),
+                                                   limit(), pos);
+    else
+        result = new DirectByteBufferImpl.ReadWrite(this, address, capacity(),
+                                                    limit(), pos);
+
+    if (mark != pos)
+      {
+	result.position(mark);
+	result.mark();
+	result.position(pos);
+      }
+    return result;
+  }
+
+  public ByteBuffer duplicate()
+  {
+    return duplicate(isReadOnly());
+  }
+
+  public ByteBuffer asReadOnlyBuffer()
+  {
+    return duplicate(true);
+  }
+
+  public CharBuffer asCharBuffer()
+  {
+    return new CharViewBufferImpl(this, remaining() >> 1);
+  }
+
+  public ShortBuffer asShortBuffer()
+  {
+    return new ShortViewBufferImpl(this, remaining() >> 1);
+  }
+
+  public IntBuffer asIntBuffer()
+  {
+    return new IntViewBufferImpl(this, remaining() >> 2);
+  }
+
+  public LongBuffer asLongBuffer()
+  {
+    return new LongViewBufferImpl(this, remaining() >> 3);
+  }
+
+  public FloatBuffer asFloatBuffer()
+  {
+    return new FloatViewBufferImpl(this, remaining() >> 2);
+  }
+
+  public DoubleBuffer asDoubleBuffer()
+  {
+    return new DoubleViewBufferImpl(this, remaining() >> 3);
+  }
+
+  public char getChar()
+  {
+    return ByteBufferHelper.getChar(this, order());
+  }
+  
+  public ByteBuffer putChar(char value)
+  {
+    ByteBufferHelper.putChar(this, value, order());
+    return this;
+  }
+  
+  public char getChar(int index)
+  {
+    return ByteBufferHelper.getChar(this, index, order());
+  }
+  
+  public ByteBuffer putChar(int index, char value)
+  {
+    ByteBufferHelper.putChar(this, index, value, order());
+    return this;
+  }
+
+  public short getShort()
+  {
+    return ByteBufferHelper.getShort(this, order());
+  }
+  
+  public ByteBuffer putShort(short value)
+  {
+    ByteBufferHelper.putShort(this, value, order());
+    return this;
+  }
+  
+  public short getShort(int index)
+  {
+    return ByteBufferHelper.getShort(this, index, order());
+  }
+  
+  public ByteBuffer putShort(int index, short value)
+  {
+    ByteBufferHelper.putShort(this, index, value, order());
+    return this;
+  }
+
+  public int getInt()
+  {
+    return ByteBufferHelper.getInt(this, order());
+  }
+  
+  public ByteBuffer putInt(int value)
+  {
+    ByteBufferHelper.putInt(this, value, order());
+    return this;
+  }
+  
+  public int getInt(int index)
+  {
+    return ByteBufferHelper.getInt(this, index, order());
+  }
+  
+  public ByteBuffer putInt(int index, int value)
+  {
+    ByteBufferHelper.putInt(this, index, value, order());
+    return this;
+  }
+
+  public long getLong()
+  {
+    return ByteBufferHelper.getLong(this, order());
+  }
+  
+  public ByteBuffer putLong(long value)
+  {
+    ByteBufferHelper.putLong(this, value, order());
+    return this;
+  }
+  
+  public long getLong(int index)
+  {
+    return ByteBufferHelper.getLong(this, index, order());
+  }
+  
+  public ByteBuffer putLong(int index, long value)
+  {
+    ByteBufferHelper.putLong(this, index, value, order());
+    return this;
+  }
+
+  public float getFloat()
+  {
+    return ByteBufferHelper.getFloat(this, order());
+  }
+  
+  public ByteBuffer putFloat(float value)
+  {
+    ByteBufferHelper.putFloat(this, value, order());
+    return this;
+  }
+  
+  public float getFloat(int index)
+  {
+    return ByteBufferHelper.getFloat(this, index, order());
+  }
+
+  public ByteBuffer putFloat(int index, float value)
+  {
+    ByteBufferHelper.putFloat(this, index, value, order());
+    return this;
+  }
+
+  public double getDouble()
+  {
+    return ByteBufferHelper.getDouble(this, order());
+  }
+
+  public ByteBuffer putDouble(double value)
+  {
+    ByteBufferHelper.putDouble(this, value, order());
+    return this;
+  }
+  
+  public double getDouble(int index)
+  {
+    return ByteBufferHelper.getDouble(this, index, order());
+  }
+  
+  public ByteBuffer putDouble(int index, double value)
+  {
+    ByteBufferHelper.putDouble(this, index, value, order());
+    return this;
+  }
+
+  // NOTE: In libgcj these methods are implemented in natFileChannelXxx.cc,
+  // because they're small, and to put them next to FileChannelImpl::mapImpl.
+  native void unmapImpl();
+  native boolean isLoadedImpl();
+    // FIXME: Try to load all pages into memory.
+  native void loadImpl();
+
+  native void forceImpl();
+}