/usr/include/dune/grid/io/file/vtk/b64enc.hh is in libdune-grid-dev 2.5.1-1.
This file is owned by root:root, with mode 0o644.
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#ifndef DUNE_GRID_IO_FILE_VTK_B64ENC_HH
#define DUNE_GRID_IO_FILE_VTK_B64ENC_HH
#include <assert.h>
namespace Dune {
/** @file
@author Christian Engwer
@brief Simple base64 encode
We implement the base64 encoding (c.f. RFC 4648 https://tools.ietf.org/html/rfc4648).
@{
*/
/** @brief endoing table */
const char base64table[] =
{
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
/** @brief struct with three bytes of text */
struct b64txt
{
typedef unsigned char size_type;
size_type size;
char txt[3];
int read(const char* t, size_type s)
{
size = s>=3 ? 3 : s;
txt[2] = s>0 ? t[0] : 0;
txt[1] = s>1 ? t[1] : 0;
txt[0] = s>2 ? t[2] : 0;
return size;
}
void put(const char c)
{
assert (size < 3);
txt[2-size++] = c;
}
};
/** struct with four six bit chunks */
struct b64data
{
typedef unsigned char size_type;
size_type size;
unsigned A : 6;
unsigned B : 6;
unsigned C : 6;
unsigned D : 6;
void write(char* t)
{
t[3] = size>2 ? base64table[A] : '=';
t[2] = size>1 ? base64table[B] : '=';
t[1] = size>0 ? base64table[C] : '=';
t[0] = size>0 ? base64table[D] : '=';
size = 0;
}
};
/** @brief union representing the three byte text as well as the four 6 bit chunks */
union b64chunk
{
b64txt txt;
b64data data;
};
/** @} */
} // namespace Dune
#endif // DUNE_GRID_IO_FILE_VTK_B64ENC_HH
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