ffmpeg/tests/base64.c

   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 }