org/jpc/emulator/memory/codeblock/ByteSourceWrappedMemory.java

   1 /*
   2     JPC-RR: A x86 PC Hardware Emulator
   3     Release 1
   4
   5     Copyright (C) 2007-2009 Isis Innovation Limited
   6     Copyright (C) 2009 H. Ilari Liusvaara
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License version 2 as published by
  10     the Free Software Foundation.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License along
  18     with this program; if not, write to the Free Software Foundation, Inc.,
  19     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20
  21     Based on JPC x86 PC Hardware emulator,
  22     A project from the Physics Dept, The University of Oxford
  23
  24     Details about original JPC can be found at:
  25
  26     www-jpc.physics.ox.ac.uk
  27
  28 */
  29
  30 package org.jpc.emulator.memory.codeblock;
  31
  32 import org.jpc.emulator.memory.Memory;
  33
  34 /**
  35  *
  36  * @author Chris Dennis
  37  */
  38 class ByteSourceWrappedMemory implements ByteSource
  39 {
  40     private Memory source;
  41     private int offset, startingPosition;
  42
  43     public void set(Memory source, int offset)
  44     {
  45         this.source = source;
  46         this.offset = offset;
  47         startingPosition = offset;
  48     }
  49
  50     public int getOffset()
  51     {
  52         return offset;
  53     }
  54
  55     public byte getByte()
  56     {
  57         return source.getByte(offset++);
  58     }
  59
  60     public void skip(int count)
  61     {
  62         if(offset + count >= source.getSize())
  63             throw new IndexOutOfBoundsException();
  64         offset += count;
  65     }
  66
  67     public void reset()
  68     {
  69         offset = startingPosition;
  70     }
  71
  72     public String toString()
  73     {
  74         return "ByteSourceWrappedMemory: [" + source + "] @ 0x" + Integer.toHexString(startingPosition);
  75     }
  76 }