AddressDataSource.java revision 9883:903a2e023ffb 
1/*
2 * Copyright (c) 2002, 2004, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25package sun.jvm.hotspot.debugger.windbg;
26
27import java.io.*;
28import sun.jvm.hotspot.debugger.*;
29import sun.jvm.hotspot.debugger.win32.coff.*;
30
31public class AddressDataSource implements DataSource {
32  public AddressDataSource(Address addr) {
33    this.addr = addr;
34    offset = 0;
35  }
36
37  public byte readByte() throws IOException {
38    try {
39      byte res = (byte) addr.getCIntegerAt(offset, 1, false);
40      ++offset;
41      return res;
42    } catch (UnmappedAddressException e) {
43      throw (IOException) new IOException("Unmapped address at 0x" + Long.toHexString(e.getAddress())).initCause(e);
44    } catch (DebuggerException e) {
45      throw (IOException) new IOException().initCause(e);
46    }
47  }
48
49  public short readShort() throws IOException {
50    // NOTE: byte swapping is taken care of at the COFFFileImpl level
51    int b1 = readByte() & 0xFF;
52    int b2 = readByte() & 0xFF;
53    return (short) ((b1 << 8) | b2);
54  }
55
56  public int readInt() throws IOException {
57    // NOTE: byte swapping is taken care of at the COFFFileImpl level
58    int b1 = ((int) readByte()) & 0xFF;
59    int b2 = ((int) readByte()) & 0xFF;
60    int b3 = ((int) readByte()) & 0xFF;
61    int b4 = ((int) readByte()) & 0xFF;
62    return ((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
63  }
64
65  public long readLong() throws IOException {
66    // NOTE: byte swapping is taken care of at the COFFFileImpl level
67    long b1 = ((long) readByte()) & 0xFFL;
68    long b2 = ((long) readByte()) & 0xFFL;
69    long b3 = ((long) readByte()) & 0xFFL;
70    long b4 = ((long) readByte()) & 0xFFL;
71    long b5 = ((long) readByte()) & 0xFFL;
72    long b6 = ((long) readByte()) & 0xFFL;
73    long b7 = ((long) readByte()) & 0xFFL;
74    long b8 = ((long) readByte()) & 0xFFL;
75    return (((((b1 << 24) | (b2 << 16) | (b3 << 8) | b4)) << 32) |
76            ((((b5 << 24) | (b6 << 16) | (b7 << 8) | b8))));
77  }
78
79  public int read(byte[] b) throws IOException {
80    for (int i = 0; i < b.length; i++) {
81      b[i] = readByte();
82    }
83    return b.length;
84  }
85
86  public void seek(long pos) throws IOException {
87    offset = pos;
88  }
89
90  public long getFilePointer() throws IOException {
91    return offset;
92  }
93
94  public void close() throws IOException {
95  }
96
97  private Address addr;
98  private long offset;
99}
100