libjava/gnu/gcj/tools/gc_analyze/BytePtr.java

   1 /* BytePtr.java -- Container for bytes from a memory image.
   2    Copyright (C) 2007  Free Software Foundation
   3
   4    This file is part of libgcj.
   5
   6 This software is copyrighted work licensed under the terms of the
   7 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   8 details.  */
   9
  10 package gnu.gcj.tools.gc_analyze;
  11
  12 import java.nio.ByteBuffer;
  13
  14 public class BytePtr
  15 {
  16   ByteBuffer content;
  17   int wordSize;
  18
  19   BytePtr(ByteBuffer b, int ws)
  20   {
  21     content = b;
  22     wordSize = ws;
  23   }
  24
  25   public int getsize()
  26   {
  27     return content.limit();
  28   }
  29
  30   public int getByte(int offset)
  31   {
  32     return content.get(offset);
  33   }
  34
  35   public int getInt(int n)
  36   {
  37     return content.getInt(n * 4);
  38   }
  39
  40   public int getShort(int n)
  41   {
  42     return content.getShort(n * 2);
  43   }
  44
  45   public long getWord(int n)
  46   {
  47     if (4 == wordSize)
  48       return 0xffffffffL & content.getInt(n * 4);
  49     else
  50       return content.getLong(n * 8);
  51   }
  52
  53   public int intsPerWord()
  54   {
  55     return (4 == wordSize) ? 1 : 2;
  56   }
  57
  58   public BytePtr getRegion(int offset, int size)
  59   {
  60     int oldLimit = content.limit();
  61     content.position(offset);
  62     content.limit(offset + size);
  63     ByteBuffer n = content.slice();
  64     content.position(0);
  65     content.limit(oldLimit);
  66
  67     return new BytePtr(n, wordSize);
  68   }
  69
  70   public void setInt(int a, int n)
  71   {
  72     content.putInt(a * 4, n);
  73   }
  74
  75   public void dump()
  76   {
  77     // 38 5a f4 2a 50 bd 04 10 10 00 00 00 0e 00 00 00   8Z.*P...........
  78     int i;
  79     StringBuilder b = new StringBuilder(67);
  80     for (i = 0; i < 66; i++)
  81       b.append(' ');
  82     b.append('\n');
  83
  84     i = 0;
  85     do
  86       {
  87         for (int j = 0; j < 16; j++)
  88           {
  89             int k = i + j;
  90
  91             if (k < content.limit())
  92               {
  93                 int v = 0xff & getByte(k);
  94                 // hex
  95                 int v1 = v/16;
  96                 b.setCharAt(j * 3 + 0,
  97                             (char)(v1 >= 10 ? 'a' - 10 + v1 : v1 + '0'));
  98                 v1 = v % 16;
  99                 b.setCharAt(j * 3 + 1,
 100                             (char)(v1 >= 10 ? 'a' - 10 + v1 : v1 + '0'));
 101                 // ascii
 102                 b.setCharAt(j + 50, (char)((v >= 32 && v <= 127) ? v: '.'));
 103               }
 104             else
 105               {
 106                 b.setCharAt(j * 3 + 0, ' ');
 107                 b.setCharAt(j * 3 + 1, ' ');
 108                 b.setCharAt(j + 50, ' ');
 109               }
 110           }
 111         i += 16;
 112         System.out.print(b);
 113       } while (i < content.limit());
 114   }
 115 }