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diff --git a/libjava/classpath/java/nio/ByteBuffer.java b/libjava/classpath/java/nio/ByteBuffer.java
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+/* ByteBuffer.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;
+
+/**
+ * @since 1.4
+ */
+public abstract class ByteBuffer extends Buffer
+  implements Comparable
+{
+  ByteOrder endian = ByteOrder.BIG_ENDIAN;
+
+  int array_offset;
+  byte[] backing_buffer;
+
+  ByteBuffer (int capacity, int limit, int position, int mark)
+  {
+    super (capacity, limit, position, mark);
+  }
+
+  /**
+   * Allocates a new direct byte buffer.
+   */ 
+  public static ByteBuffer allocateDirect (int capacity)
+  {
+    return DirectByteBufferImpl.allocate (capacity);
+  }
+
+  /**
+   * Allocates a new <code>ByteBuffer</code> object with a given capacity.
+   */
+  public static ByteBuffer allocate (int capacity)
+  {
+    return wrap(new byte[capacity], 0, capacity);
+  }
+
+  /**
+   * Wraps a <code>byte</code> array into a <code>ByteBuffer</code>
+   * object.
+   *
+   * @exception IndexOutOfBoundsException If the preconditions on the offset
+   * and length parameters do not hold
+   */
+  public static final ByteBuffer wrap (byte[] array, int offset, int length)
+  {
+    // FIXME: In GCJ and other implementations where arrays may not
+    // move we might consider, at least when offset==0:
+    // return new DirectByteBufferImpl(array,
+    //                                 address_of_data(array) + offset,
+    //                                 length, length, 0, false);
+    // This may be more efficient, mainly because we can then use the
+    // same logic for all ByteBuffers.
+
+    return new ByteBufferImpl (array, 0, array.length, offset + length, offset, -1, false);
+  }
+
+  /**
+   * Wraps a <code>byte</code> array into a <code>ByteBuffer</code>
+   * object.
+   */
+  public static final ByteBuffer wrap (byte[] array)
+  {
+    return wrap (array, 0, array.length);
+  }
+  
+  /**
+   * This method transfers <code>byte</code>s from this buffer into the given
+   * destination array. Before the transfer, it checks if there are fewer than
+   * length <code>byte</code>s remaining in this buffer.
+   *
+   * @param dst The destination array
+   * @param offset The offset within the array of the first <code>byte</code>
+   * to be written; must be non-negative and no larger than dst.length.
+   * @param length The maximum number of bytes to be written to the given array;
+   * must be non-negative and no larger than dst.length - offset.
+   *
+   * @exception BufferUnderflowException If there are fewer than length
+   * <code>byte</code>s remaining in this buffer.
+   * @exception IndexOutOfBoundsException If the preconditions on the offset
+   * and length parameters do not hold.
+   */
+  public ByteBuffer get (byte[] dst, int offset, int length)
+  {
+    checkArraySize(dst.length, offset, length);
+    checkForUnderflow(length);
+
+    for (int i = offset; i < offset + length; i++)
+      {
+        dst [i] = get ();
+      }
+
+    return this;
+  }
+
+  /**
+   * This method transfers <code>byte</code>s from this buffer into the given
+   * destination array.
+   *
+   * @param dst The byte array to write into.
+   *
+   * @exception BufferUnderflowException If there are fewer than dst.length
+   * <code>byte</code>s remaining in this buffer.
+   */
+  public ByteBuffer get (byte[] dst)
+  {
+    return get (dst, 0, dst.length);
+  }
+
+  /**
+   * Writes the content of the the <code>ByteBUFFER</code> src
+   * into the buffer. Before the transfer, it checks if there is fewer than
+   * <code>src.remaining()</code> space remaining in this buffer.
+   *
+   * @param src The source data.
+   *
+   * @exception BufferOverflowException If there is insufficient space in this
+   * buffer for the remaining <code>byte</code>s in the source buffer.
+   * @exception IllegalArgumentException If the source buffer is this buffer.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public ByteBuffer put (ByteBuffer src)
+  {
+    if (src == this)
+      throw new IllegalArgumentException ();
+
+    checkForOverflow(src.remaining());
+
+    if (src.remaining () > 0)
+      {
+        byte[] toPut = new byte [src.remaining ()];
+        src.get (toPut);
+        put (toPut);
+      }
+
+    return this;
+  }
+
+  /**
+   * Writes the content of the the <code>byte array</code> src
+   * into the buffer. Before the transfer, it checks if there is fewer than
+   * length space remaining in this buffer.
+   *
+   * @param src The array to copy into the buffer.
+   * @param offset The offset within the array of the first byte to be read;
+   * must be non-negative and no larger than src.length.
+   * @param length The number of bytes to be read from the given array;
+   * must be non-negative and no larger than src.length - offset.
+   * 
+   * @exception BufferOverflowException If there is insufficient space in this
+   * buffer for the remaining <code>byte</code>s in the source array.
+   * @exception IndexOutOfBoundsException If the preconditions on the offset
+   * and length parameters do not hold
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public ByteBuffer put (byte[] src, int offset, int length)
+  {
+    checkArraySize(src.length, offset, length);
+    checkForOverflow(length);
+
+    for (int i = offset; i < offset + length; i++)
+      put (src [i]);
+
+    return this;
+  }
+
+  /**
+   * Writes the content of the the <code>byte array</code> src
+   * into the buffer.
+   *
+   * @param src The array to copy into the buffer.
+   * 
+   * @exception BufferOverflowException If there is insufficient space in this
+   * buffer for the remaining <code>byte</code>s in the source array.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public final ByteBuffer put (byte[] src)
+  {
+    return put (src, 0, src.length);
+  }
+
+  /**
+   * Tells whether ot not this buffer is backed by an accessible
+   * <code>byte</code> array.
+   */
+  public final boolean hasArray ()
+  {
+    return (backing_buffer != null
+            && !isReadOnly ());
+  }
+
+  /**
+   * Returns the <code>byte</code> array that backs this buffer.
+   *
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   * @exception UnsupportedOperationException If this buffer is not backed
+   * by an accessible array.
+   */
+  public final byte[] array ()
+  {
+    if (backing_buffer == null)
+      throw new UnsupportedOperationException ();
+
+    checkIfReadOnly();
+    
+    return backing_buffer;
+  }
+
+  /**
+   * Returns the offset within this buffer's backing array of the first element.
+   *
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   * @exception UnsupportedOperationException If this buffer is not backed
+   * by an accessible array.
+   */
+  public final int arrayOffset ()
+  {
+    if (backing_buffer == null)
+      throw new UnsupportedOperationException ();
+
+    checkIfReadOnly();
+    
+    return array_offset;
+  }
+
+  /**
+   * Calculates a hash code for this buffer.
+   *
+   * This is done with <code>int</code> arithmetic,
+   * where ** represents exponentiation, by this formula:<br>
+   * <code>s[position()] + 31 + (s[position()+1] + 30)*31**1 + ... +
+   * (s[limit()-1]+30)*31**(limit()-1)</code>.
+   * Where s is the buffer data. Note that the hashcode is dependent
+   * on buffer content, and therefore is not useful if the buffer
+   * content may change.
+   *
+   * @return the hash code
+   */
+  public int hashCode ()
+  {
+    int hashCode = get(position()) + 31;
+    int multiplier = 1;
+    for (int i = position() + 1; i < limit(); ++i)
+      {
+	  multiplier *= 31;
+	  hashCode += (get(i) + 30)*multiplier;
+      }
+    return hashCode;
+  }
+
+  /**
+   * Checks if this buffer is equal to obj.
+   */
+  public boolean equals (Object obj)
+  {
+    if (obj instanceof ByteBuffer)
+      {
+        return compareTo (obj) == 0;
+      }
+
+    return false;
+  }
+
+  /**
+   * Compares two <code>ByteBuffer</code> objects.
+   *
+   * @exception ClassCastException If obj is not an object derived from
+   * <code>ByteBuffer</code>.
+   */
+  public int compareTo (Object obj)
+  {
+    ByteBuffer other = (ByteBuffer) obj;
+
+    int num = Math.min(remaining(), other.remaining());
+    int pos_this = position();
+    int pos_other = other.position();
+    
+    for (int count = 0; count < num; count++)
+      {
+        byte a = get(pos_this++);
+	byte b = other.get(pos_other++);
+      	 
+	if (a == b)
+	  continue;
+      	   
+	if (a < b)
+	  return -1;
+      	   
+	return 1;
+      }
+      
+    return remaining() - other.remaining();
+  }
+
+  /**
+   * Returns the byte order of this buffer.
+   */  
+  public final ByteOrder order ()
+  {
+    return endian;
+  }
+  
+  /**
+   * Modifies this buffer's byte order.
+   */
+  public final ByteBuffer order (ByteOrder endian)
+  {
+    this.endian = endian;
+    return this;
+  }
+  
+  /**
+   * Reads the <code>byte</code> at this buffer's current position,
+   * and then increments the position.
+   *
+   * @exception BufferUnderflowException If there are no remaining
+   * <code>byte</code>s in this buffer.
+   */
+  public abstract byte get ();
+
+  /**
+   * Writes the <code>byte</code> at this buffer's current position,
+   * and then increments the position.
+   *
+   * @exception BufferOverflowException If there no remaining 
+   * <code>byte</code>s in this buffer.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public abstract ByteBuffer put (byte b);
+
+  /**
+   * Absolute get method.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit.
+   */
+  public abstract byte get (int index);
+  
+  /**
+   * Absolute put method.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit.
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public abstract ByteBuffer put (int index, byte b);
+
+  /**
+   * Compacts this buffer.
+   * 
+   * @exception ReadOnlyBufferException If this buffer is read-only.
+   */
+  public abstract ByteBuffer compact ();
+
+  void shiftDown (int dst_offset, int src_offset, int count)
+  {
+    for (int i = 0; i < count; i++)
+      put(dst_offset + i, get(src_offset + i));
+  }
+
+  /**
+   * Tells whether or not this buffer is direct.
+   */
+  public abstract boolean isDirect ();
+
+  /**
+   * Creates a new <code>ByteBuffer</code> whose content is a shared
+   * subsequence of this buffer's content.
+   */
+  public abstract ByteBuffer slice ();
+
+  /**
+   * Creates a new <code>ByteBuffer</code> that shares this buffer's
+   * content.
+   */
+  public abstract ByteBuffer duplicate ();
+
+  /**
+   * Creates a new read-only <code>ByteBuffer</code> that shares this
+   * buffer's content.
+   */
+  public abstract ByteBuffer asReadOnlyBuffer ();
+ 
+  /**
+   * Creates a view of this byte buffer as a short buffer.
+   */
+  public abstract ShortBuffer asShortBuffer ();
+  
+  /**
+   * Creates a view of this byte buffer as a char buffer.
+   */
+  public abstract CharBuffer asCharBuffer ();
+  
+  /**
+   * Creates a view of this byte buffer as an integer buffer.
+   */
+  public abstract IntBuffer asIntBuffer ();
+  
+  /**
+   * Creates a view of this byte buffer as a long buffer.
+   */
+  public abstract LongBuffer asLongBuffer ();
+  
+  /**
+   * Creates a view of this byte buffer as a float buffer.
+   */
+  public abstract FloatBuffer asFloatBuffer ();
+  
+  /**
+   * Creates a view of this byte buffer as a double buffer.
+   */
+  public abstract DoubleBuffer asDoubleBuffer ();
+
+  /**
+   * Relative get method for reading a character value.
+   *
+   * @exception BufferUnderflowException  If there are fewer than two bytes
+   * remaining in this buffer.
+   */
+  public abstract char getChar ();
+  
+  /**
+   * Relative put method for writing a character value.
+   *
+   * @exception BufferOverflowException If this buffer's current position is
+   * not smaller than its limit.
+   */
+  public abstract ByteBuffer putChar (char value);
+  
+  /**
+   * Absolute get method for reading a character value.
+   *
+   * @exception IndexOutOfBoundsException If there are fewer than two bytes
+   * remaining in this buffer
+   */
+  public abstract char getChar (int index);
+  
+  /**
+   * Absolute put method for writing a character value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus one.
+   */
+  public abstract ByteBuffer putChar (int index, char value);
+  
+  /**
+   * Relative get method for reading a short value.
+   *
+   * @exception BufferUnderflowException If index is negative or not smaller
+   * than the buffer's limit, minus one.
+   */
+  public abstract short getShort ();
+  
+  /**
+   * Relative put method for writing a short value.
+   *
+   * @exception BufferOverflowException If this buffer's current position is
+   * not smaller than its limit.
+   */
+  public abstract ByteBuffer putShort (short value);
+  
+  /**
+   * Absolute get method for reading a short value.
+   *
+   * @exception IndexOutOfBoundsException If there are fewer than two bytes
+   * remaining in this buffer
+   */
+  public abstract short getShort (int index);
+ 
+  /**
+   * Absolute put method for writing a short value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus one.
+   */
+  public abstract ByteBuffer putShort (int index, short value);
+  
+  /**
+   * Relative get method for reading an integer value.
+   *
+   * @exception BufferUnderflowException If there are fewer than four bytes
+   * remaining in this buffer.
+   */
+  public abstract int getInt ();
+  
+  /**
+   * Relative put method for writing an integer value.
+   *
+   * @exception BufferOverflowException If this buffer's current position is
+   * not smaller than its limit.
+   */
+  public abstract ByteBuffer putInt (int value);
+  
+  /**
+   * Absolute get method for reading an integer value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus three.
+   */
+  public abstract int getInt (int index);
+  
+  /**
+   * Absolute put method for writing an integer value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus three.
+   */
+  public abstract ByteBuffer putInt (int index, int value);
+  
+  /**
+   * Relative get method for reading a long value.
+   *
+   * @exception BufferUnderflowException If there are fewer than eight bytes
+   * remaining in this buffer.
+   */
+  public abstract long getLong ();
+  
+  /**
+   * Relative put method for writing a long value.
+   *
+   * @exception BufferOverflowException If this buffer's current position is
+   * not smaller than its limit.
+   */
+  public abstract ByteBuffer putLong (long value);
+  
+  /**
+   * Absolute get method for reading a long value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus seven.
+   */
+  public abstract long getLong (int index);
+  
+  /**
+   * Absolute put method for writing a float value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus seven.
+   */
+  public abstract ByteBuffer putLong (int index, long value);
+  
+  /**
+   * Relative get method for reading a float value.
+   *
+   * @exception BufferUnderflowException If there are fewer than four bytes
+   * remaining in this buffer.
+   */
+  public abstract float getFloat ();
+  
+  /**
+   * Relative put method for writing a float value.
+   *
+   * @exception BufferOverflowException If there are fewer than four bytes
+   * remaining in this buffer.
+   */
+  public abstract ByteBuffer putFloat (float value);
+  
+  /**
+   * Absolute get method for reading a float value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus three.
+   */
+  public abstract float getFloat (int index);
+  
+  /**
+   * Relative put method for writing a float value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus three.
+   */
+  public abstract ByteBuffer putFloat (int index, float value);
+  
+  /**
+   * Relative get method for reading a double value.
+   *
+   * @exception BufferUnderflowException If there are fewer than eight bytes
+   * remaining in this buffer.
+   */
+  public abstract double getDouble ();
+  
+  /**
+   * Relative put method for writing a double value.
+   *
+   * @exception BufferOverflowException If this buffer's current position is
+   * not smaller than its limit.
+   */
+  public abstract ByteBuffer putDouble (double value);
+  
+  /**
+   * Absolute get method for reading a double value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus seven.
+   */
+  public abstract double getDouble (int index);
+  
+  /**
+   * Absolute put method for writing a double value.
+   *
+   * @exception IndexOutOfBoundsException If index is negative or not smaller
+   * than the buffer's limit, minus seven.
+   */
+  public abstract ByteBuffer putDouble (int index, double value);
+
+  /**
+   * Returns a string summarizing the state of this buffer.
+   */
+  public String toString ()
+  {
+    return getClass ().getName () +
+	    "[pos=" + position () +
+	    " lim=" + limit () +
+	    " cap=" + capacity () + "]";
+  }
+}