1  using System;
 2  using System.Text;
 3  
 4  namespace Ryujinx.Common
 5  {
 6      public static class HexUtils
 7      {
 8          private static readonly char[] _hexChars = "0123456789ABCDEF".ToCharArray();
 9  
10          private const int HexTableColumnWidth = 8;
11          private const int HexTableColumnSpace = 3;
12  
13          // Modified for Ryujinx
14          // Original by Pascal Ganaye - CPOL License
15          // https://www.codeproject.com/Articles/36747/Quick-and-Dirty-HexDump-of-a-Byte-Array
16          public static string HexTable(byte[] bytes, int bytesPerLine = 16)
17          {
18              if (bytes == null)
19              {
20                  return "<null>";
21              }
22  
23              int bytesLength = bytes.Length;
24  
25              int firstHexColumn =
26                    HexTableColumnWidth
27                  + HexTableColumnSpace;
28  
29              int firstCharColumn = firstHexColumn
30                  + bytesPerLine * HexTableColumnSpace
31                  + (bytesPerLine - 1) / HexTableColumnWidth
32                  + 2;
33  
34              int lineLength = firstCharColumn
35                  + bytesPerLine
36                  + Environment.NewLine.Length;
37  
38              char[] line = (new String(' ', lineLength - Environment.NewLine.Length) + Environment.NewLine).ToCharArray();
39  
40              int expectedLines = (bytesLength + bytesPerLine - 1) / bytesPerLine;
41  
42              StringBuilder result = new(expectedLines * lineLength);
43  
44              for (int i = 0; i < bytesLength; i += bytesPerLine)
45              {
46                  line[0] = _hexChars[(i >> 28) & 0xF];
47                  line[1] = _hexChars[(i >> 24) & 0xF];
48                  line[2] = _hexChars[(i >> 20) & 0xF];
49                  line[3] = _hexChars[(i >> 16) & 0xF];
50                  line[4] = _hexChars[(i >> 12) & 0xF];
51                  line[5] = _hexChars[(i >> 8) & 0xF];
52                  line[6] = _hexChars[(i >> 4) & 0xF];
53                  line[7] = _hexChars[(i >> 0) & 0xF];
54  
55                  int hexColumn = firstHexColumn;
56                  int charColumn = firstCharColumn;
57  
58                  for (int j = 0; j < bytesPerLine; j++)
59                  {
60                      if (j > 0 && (j & 7) == 0)
61                      {
62                          hexColumn++;
63                      }
64  
65                      if (i + j >= bytesLength)
66                      {
67                          line[hexColumn] = ' ';
68                          line[hexColumn + 1] = ' ';
69                          line[charColumn] = ' ';
70                      }
71                      else
72                      {
73                          byte b = bytes[i + j];
74  
75                          line[hexColumn] = _hexChars[(b >> 4) & 0xF];
76                          line[hexColumn + 1] = _hexChars[b & 0xF];
77                          line[charColumn] = (b < 32 ? '·' : (char)b);
78                      }
79  
80                      hexColumn += 3;
81                      charColumn++;
82                  }
83  
84                  result.Append(line);
85              }
86  
87              return result.ToString();
88          }
89      }
90  }