wvdotnet/wvhexdump.cs

   1 /*
   2  * Versaplex:
   3  *   Copyright (C)2007-2008 Versabanq Innovations Inc. and contributors.
   4  *       See the included file named LICENSE for license information.
   5  */
   6 using System;
   7 using System.Text;
   8 using System.Linq;
   9
  10 namespace Wv
  11 {
  12     public class WvDelayedString
  13     {
  14         Func<string> a;
  15
  16         public WvDelayedString(Func<string> a)
  17         {
  18             this.a = a;
  19         }
  20
  21         public override string ToString()
  22         {
  23             return a();
  24         }
  25     }
  26
  27     public partial class wv
  28     {
  29         static string hexbyte(WvBytes b, int ofs)
  30         {
  31             if (ofs >= b.start && ofs < b.start+b.len)
  32                 return b.bytes[ofs].ToString("x2");
  33             else
  34                 return "  ";
  35         }
  36
  37         static char printable(WvBytes b, int ofs)
  38         {
  39             if (ofs >= b.start && ofs < b.start+b.len)
  40             {
  41                 byte n = b.bytes[ofs];
  42                 if (31 < n && n < 127)
  43                     return (char)n;
  44                 else
  45                     return '.';
  46             }
  47             else
  48                 return ' ';
  49         }
  50
  51         public static string _hexdump(WvBytes b)
  52         {
  53             if (b.bytes == null)
  54                 return "(nil)";
  55
  56             var sb = new StringBuilder();
  57
  58             // This is overly complicated so that the body and header of
  59             // the same buffer can be printed separately yet still show the
  60             // proper alignment
  61
  62             int rowoffset = b.start & (~0xf);
  63
  64             // Note: it's important to set the right capacity when dealing
  65             // with large quantities of data.  Assume about 80 chars per line.
  66             sb.EnsureCapacity((b.len / 16 + 2) * 80);
  67
  68             for (int i = rowoffset; i < b.len; i += 16)
  69             {
  70                 sb.Append('[').Append(i.ToString("x4")).Append("]");
  71
  72                 for (int j = 0; j < 16; j++)
  73                 {
  74                     if ((j % 4)==0)
  75                         sb.Append(' ');
  76                     sb.Append(hexbyte(b, i+j));
  77                 }
  78
  79                 sb.Append(' ');
  80
  81                 for (int j = 0; j < 16; j++)
  82                 {
  83                     if ((j % 4)==0)
  84                         sb.Append(' ');
  85                     sb.Append(printable(b, i+j));
  86                 }
  87
  88                 sb.Append('\n');
  89             }
  90
  91             return sb.ToString();
  92         }
  93
  94         public static object hexdump(WvBytes b)
  95         {
  96             return new WvDelayedString(() => _hexdump(b));
  97         }
  98     }
  99 }