358 lines
9.7 KiB
Java
358 lines
9.7 KiB
Java
/* DirectByteBufferImpl.java --
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Copyright (C) 2003 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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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import gnu.classpath.Configuration;
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import gnu.gcj.RawData;
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class DirectByteBufferImpl extends ByteBuffer
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{
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static
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{
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// load the shared library needed for native methods.
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if (Configuration.INIT_LOAD_LIBRARY)
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{
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System.loadLibrary ("javanio");
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}
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}
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RawData address;
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private int offset;
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private boolean readOnly;
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public DirectByteBufferImpl (RawData address, long len)
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{
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this (address, 0, (int) len, (int) len, 0, -1, false);
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}
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public DirectByteBufferImpl (RawData address, int offset, int capacity,
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int limit, int position, int mark,
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boolean readOnly)
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{
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super (capacity, limit, position, mark);
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this.address = address;
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this.offset = offset;
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this.readOnly = readOnly;
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}
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private static native RawData allocateImpl (int capacity);
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private static native void freeImpl (RawData address);
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protected void finalize () throws Throwable
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{
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freeImpl (address);
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}
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public static ByteBuffer allocateDirect (int capacity)
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{
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RawData address = allocateImpl (capacity);
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if (address == null)
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throw new InternalError ("Not enough memory to create direct buffer");
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return new DirectByteBufferImpl (address, 0, capacity, capacity, 0, -1, false);
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}
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private native byte getImpl (int index);
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private native void putImpl (int index, byte value);
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public byte get ()
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{
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byte result = getImpl (position () + offset);
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position (position () + 1);
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return result;
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}
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public byte get (int index)
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{
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return getImpl (index);
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}
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public ByteBuffer put (byte value)
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{
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putImpl (position (), value);
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position (position () + 1);
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return this;
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}
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public ByteBuffer put (int index, byte value)
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{
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putImpl (index, value);
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return this;
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}
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public ByteBuffer compact ()
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{
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// FIXME this can sure be optimized using memcpy()
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int copied = 0;
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while (remaining () > 0)
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{
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put (copied, get ());
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copied++;
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}
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position (copied);
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return this;
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}
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public ByteBuffer duplicate ()
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{
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return new DirectByteBufferImpl (
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address, offset, capacity (), limit (), position (), -1, isReadOnly ());
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}
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public ByteBuffer slice ()
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{
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return new DirectByteBufferImpl (address, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
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}
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public ByteBuffer asReadOnlyBuffer ()
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{
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return new DirectByteBufferImpl (
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address, offset, capacity (), limit (), position (), -1, true);
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}
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public boolean isReadOnly ()
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{
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return readOnly;
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}
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public boolean isDirect ()
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{
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return true;
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}
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public CharBuffer asCharBuffer ()
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{
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return new CharViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
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}
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public DoubleBuffer asDoubleBuffer ()
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{
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return new DoubleViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
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}
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public FloatBuffer asFloatBuffer ()
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{
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return new FloatViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
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}
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public IntBuffer asIntBuffer ()
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{
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return new IntViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
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}
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public LongBuffer asLongBuffer ()
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{
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return new LongViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
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}
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public ShortBuffer asShortBuffer ()
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{
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return new ShortViewBufferImpl (this, position () + offset, remaining (), remaining (), 0, -1, isReadOnly ());
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}
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final public char getChar ()
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{
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// FIXME: this handles little endian only
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return (char) (((get () & 0xff) << 8)
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+ (get () & 0xff));
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}
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final public ByteBuffer putChar (char value)
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{
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// FIXME: this handles little endian only
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put ((byte) ((((int) value) & 0xff00) >> 8));
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put ((byte) (((int) value) & 0x00ff));
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return this;
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}
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final public char getChar (int index)
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{
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// FIXME: this handles little endian only
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return (char) (((get (index) & 0xff) << 8)
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+ (get (index + 1) & 0xff));
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}
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final public ByteBuffer putChar (int index, char value)
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{
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// FIXME: this handles little endian only
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put (index, (byte) ((((int) value) & 0xff00) >> 8));
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put (index + 1, (byte) (((int) value) & 0x00ff));
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return this;
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}
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final public short getShort ()
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{
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// FIXME: this handles little endian only
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return (short) (((get () & 0xff) << 8)
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+ (get () & 0xff));
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}
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final public ByteBuffer putShort (short value)
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{
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// FIXME: this handles little endian only
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put ((byte) ((((int) value) & 0xff00) >> 8));
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put ((byte) (((int) value) & 0x00ff));
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return this;
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}
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final public short getShort (int index)
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{
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// FIXME: this handles little endian only
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return (short) (((get (index) & 0xff) << 8)
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+ (get (index + 1) & 0xff));
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}
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final public ByteBuffer putShort (int index, short value)
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{
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// FIXME: this handles little endian only
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put (index, (byte) ((((int) value) & 0xff00) >> 8));
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put (index + 1, (byte) (((int) value) & 0x00ff));
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return this;
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}
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final public int getInt ()
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{
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// FIXME: this handles little endian only
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return (int) (((get () & 0xff) << 24)
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+ ((get () & 0xff) << 16)
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+ ((get () & 0xff) << 8)
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+ (get () & 0xff));
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}
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final public ByteBuffer putInt (int value)
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{
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// FIXME: this handles little endian only
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put ((byte) ((((int) value) & 0xff000000) >> 24));
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put ((byte) ((((int) value) & 0x00ff0000) >> 16));
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put ((byte) ((((int) value) & 0x0000ff00) >> 8));
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put ((byte) (((int) value) & 0x000000ff));
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return this;
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}
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final public int getInt (int index)
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{
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// FIXME: this handles little endian only
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return (int) (((get (index) & 0xff) << 24)
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+ ((get (index + 1) & 0xff) << 16)
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+ ((get (index + 2) & 0xff) << 8)
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+ (get (index + 3) & 0xff));
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}
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final public ByteBuffer putInt (int index, int value)
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{
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// FIXME: this handles little endian only
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put (index, (byte) ((((int) value) & 0xff000000) >> 24));
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put (index + 1, (byte) ((((int) value) & 0x00ff0000) >> 16));
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put (index + 2, (byte) ((((int) value) & 0x0000ff00) >> 8));
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put (index + 3, (byte) (((int) value) & 0x000000ff));
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return this;
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}
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final public long getLong ()
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{
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// FIXME: this handles little endian only
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return (long) (((get () & 0xff) << 56)
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+ ((get () & 0xff) << 48)
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+ ((get () & 0xff) << 40)
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+ ((get () & 0xff) << 32)
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+ ((get () & 0xff) << 24)
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+ ((get () & 0xff) << 16)
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+ ((get () & 0xff) << 8)
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+ (get () & 0xff));
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}
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final public ByteBuffer putLong (long value)
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{
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return ByteBufferHelper.putLong (this, value);
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}
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final public long getLong (int index)
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{
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return ByteBufferHelper.getLong (this, index);
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}
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final public ByteBuffer putLong (int index, long value)
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{
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return ByteBufferHelper.putLong (this, index, value);
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}
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final public float getFloat ()
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{
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return ByteBufferHelper.getFloat (this);
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}
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final public ByteBuffer putFloat (float value)
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{
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return ByteBufferHelper.putFloat (this, value);
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}
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public final float getFloat (int index)
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{
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return ByteBufferHelper.getFloat (this, index);
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}
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final public ByteBuffer putFloat (int index, float value)
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{
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return ByteBufferHelper.putFloat (this, index, value);
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}
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final public double getDouble ()
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{
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return ByteBufferHelper.getDouble (this);
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}
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final public ByteBuffer putDouble (double value)
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{
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return ByteBufferHelper.putDouble (this, value);
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}
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final public double getDouble (int index)
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{
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return ByteBufferHelper.getDouble (this, index);
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}
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final public ByteBuffer putDouble (int index, double value)
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{
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return ByteBufferHelper.putDouble (this, index, value);
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}
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}
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