Java example source code file (AddressDataSource.java)

This example Java source code file (AddressDataSource.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

addressdatasource, debuggerexception, ioexception, unmapped, unmappedaddressexception

The AddressDataSource.java Java example source code

/*
 * Copyright (c) 2002, 2004, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.debugger.windbg;

import java.io.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.win32.coff.*;

public class AddressDataSource implements DataSource {
  public AddressDataSource(Address addr) {
    this.addr = addr;
    offset = 0;
  }

  public byte readByte() throws IOException {
    try {
      byte res = (byte) addr.getCIntegerAt(offset, 1, false);
      ++offset;
      return res;
    } catch (UnmappedAddressException e) {
      throw (IOException) new IOException("Unmapped address at 0x" + Long.toHexString(e.getAddress())).initCause(e);
    } catch (DebuggerException e) {
      throw (IOException) new IOException().initCause(e);
    }
  }

  public short readShort() throws IOException {
    // NOTE: byte swapping is taken care of at the COFFFileImpl level
    int b1 = readByte() & 0xFF;
    int b2 = readByte() & 0xFF;
    return (short) ((b1 << 8) | b2);
  }

  public int readInt() throws IOException {
    // NOTE: byte swapping is taken care of at the COFFFileImpl level
    int b1 = ((int) readByte()) & 0xFF;
    int b2 = ((int) readByte()) & 0xFF;
    int b3 = ((int) readByte()) & 0xFF;
    int b4 = ((int) readByte()) & 0xFF;
    return ((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
  }

  public long readLong() throws IOException {
    // NOTE: byte swapping is taken care of at the COFFFileImpl level
    long b1 = ((long) readByte()) & 0xFFL;
    long b2 = ((long) readByte()) & 0xFFL;
    long b3 = ((long) readByte()) & 0xFFL;
    long b4 = ((long) readByte()) & 0xFFL;
    long b5 = ((long) readByte()) & 0xFFL;
    long b6 = ((long) readByte()) & 0xFFL;
    long b7 = ((long) readByte()) & 0xFFL;
    long b8 = ((long) readByte()) & 0xFFL;
    return (((((b1 << 24) | (b2 << 16) | (b3 << 8) | b4)) << 32) |
            ((((b5 << 24) | (b6 << 16) | (b7 << 8) | b8))));
  }

  public int read(byte[] b) throws IOException {
    for (int i = 0; i < b.length; i++) {
      b[i] = readByte();
    }
    return b.length;
  }

  public void seek(long pos) throws IOException {
    offset = pos;
  }

  public long getFilePointer() throws IOException {
    return offset;
  }

  public void close() throws IOException {
  }

  private Address addr;
  private long offset;
}