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
main(void)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 }
55