dune-grid  2.2.0
b64enc.hh
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1 // -*- tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 // vi: set et ts=8 sw=4 sts=4:
3 
4 #ifndef DUNE_GRID_IO_FILE_VTK_B64ENC_HH
5 #define DUNE_GRID_IO_FILE_VTK_B64ENC_HH
6 
7 #include <assert.h>
8 
9 namespace Dune {
10 
19 const char base64table[] =
20 {
21  'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
22  'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
23  'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
24  'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
25  '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
26 };
27 
29 struct b64txt
30 {
31  typedef unsigned char size_type;
33  char txt[3];
34  int read(const char* t, size_type s)
35  {
36  size = s>=3?3:s;
37  txt[2] = s>0?t[0]:0;
38  txt[1] = s>1?t[1]:0;
39  txt[0] = s>2?t[2]:0;
40  return size;
41  }
42  void put(const char c)
43  {
44  assert (size < 3);
45  txt[2-size++] = c;
46  }
47 };
48 
50 struct b64data
51 {
52  typedef unsigned char size_type;
54  unsigned A : 6;
55  unsigned B : 6;
56  unsigned C : 6;
57  unsigned D : 6;
58  void write(char* t)
59  {
60  t[3] = size>2?base64table[A]:'=';
61  t[2] = size>1?base64table[B]:'=';
62  t[1] = size>0?base64table[C]:'=';
63  t[0] = size>0?base64table[D]:'=';
64  size = 0;
65  }
66 };
67 
69 union b64chunk
70 {
73 };
74 
77 } // namespace Dune
78 
79 #endif // DUNE_GRID_IO_FILE_VTK_B64ENC_HH