Dune Core Modules (2.4.1)

b64enc.hh
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1// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2// vi: set et ts=4 sw=2 sts=2:
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
9namespace 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;
32 size_type size;
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;
53 size_type size;
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
70 {
71 b64txt txt;
72 b64data data;
73 };
74
77} // namespace Dune
78
79#endif // DUNE_GRID_IO_FILE_VTK_B64ENC_HH
Dune namespace.
Definition: alignment.hh:10
const char base64table[]
endoing table
Definition: b64enc.hh:19
Definition: b64enc.hh:51
struct with three bytes of text
Definition: b64enc.hh:30
union representing the three byte text aswell as the four 6 bit chunks
Definition: b64enc.hh:70
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