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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. }
  55.