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 }