0
|
1 /*
|
|
2 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
|
|
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
4 *
|
|
5 * This code is free software; you can redistribute it and/or modify it
|
|
6 * under the terms of the GNU General Public License version 2 only, as
|
|
7 * published by the Free Software Foundation.
|
|
8 *
|
|
9 * This code is distributed in the hope that it will be useful, but WITHOUT
|
|
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
12 * version 2 for more details (a copy is included in the LICENSE file that
|
|
13 * accompanied this code).
|
|
14 *
|
|
15 * You should have received a copy of the GNU General Public License version
|
|
16 * 2 along with this work; if not, write to the Free Software Foundation,
|
|
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
18 *
|
|
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
20 * CA 95054 USA or visit www.sun.com if you need additional information or
|
|
21 * have any questions.
|
|
22 *
|
|
23 */
|
|
24
|
|
25 package sun.jvm.hotspot.debugger;
|
|
26
|
|
27 import java.io.*;
|
|
28 import java.nio.*;
|
|
29
|
|
30 /** Implementation of DataSource using MappedByteBuffer. This works
|
|
31 around a performance problem in JDK 1.4 where ByteBuffer's
|
|
32 operations always become virtual calls rather than being inlined.
|
|
33 Need to fix this soon. */
|
|
34
|
|
35 public class MappedByteBufferDataSource implements DataSource {
|
|
36 private MappedByteBuffer buf;
|
|
37
|
|
38 public MappedByteBufferDataSource(MappedByteBuffer buf) {
|
|
39 this.buf = buf;
|
|
40 }
|
|
41
|
|
42 public byte readByte() throws IOException { return buf.get(); }
|
|
43 public short readShort() throws IOException { return buf.getShort(); }
|
|
44 public int readInt() throws IOException { return buf.getInt(); }
|
|
45 public long readLong() throws IOException { return buf.getLong(); }
|
|
46 public int read(byte[] b) throws IOException { buf.get(b); return b.length; }
|
|
47 public void seek(long pos) throws IOException {
|
|
48 try {
|
|
49 buf.position((int) pos);
|
|
50 } catch (IllegalArgumentException e) {
|
|
51 System.err.println("Error seeking to file position 0x" + Long.toHexString(pos));
|
|
52 throw(e);
|
|
53 }
|
|
54 }
|
|
55 public long getFilePointer() throws IOException { return buf.position(); }
|
|
56 public void close() throws IOException { buf = null; }
|
|
57 }
|