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base64.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /*
20  * Based on libavutil/base64.c
21  */
22 
23 #include <stdio.h>
24 
25 int main(void)
26 {
27  static const char b64[] =
28  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
29  unsigned i_bits = 0;
30  int i_shift = 0;
31  int out_len = 0;
32  int in;
33 
34 #define putb64() \
35  do { \
36  putchar(b64[(i_bits << 6 >> i_shift) & 0x3f]); \
37  out_len++; \
38  i_shift -= 6; \
39  } while (0)
40 
41  while ((in = getchar()) != EOF) {
42  i_bits = (i_bits << 8) + in;
43  i_shift += 8;
44  while (i_shift > 6)
45  putb64();
46  }
47  while (i_shift > 0)
48  putb64();
49  while (out_len++ & 3)
50  putchar('=');
51  putchar('\n');
52 
53  return 0;
54 }