1 /*
   2  * Copyright (c) 2000, 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 
  25 package sun.jvm.hotspot.debugger.win32;
  26 
  27 import java.io.*;
  28 import sun.jvm.hotspot.debugger.*;
  29 import sun.jvm.hotspot.debugger.win32.coff.*;
  30 
  31 class AddressDataSource implements DataSource {
  32   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(e.toString()).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 }