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