/*
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /*
  * Based on libavutil/base64.c
  */
 
 #include <stdio.h>
 
 int main(void)
 {
     static const char b64[] =
         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
     unsigned i_bits = 0;
     int i_shift = 0;
     int out_len = 0;
     int in;
 
 #define putb64() do {                                   \
         putchar(b64[(i_bits << 6 >> i_shift) & 0x3f]);  \
         out_len++;                                      \
         i_shift -= 6;                                   \
     } while (0)
 
     while ((in = getchar()) != EOF) {
         i_bits = (i_bits << 8) + in;
         i_shift += 8;
         while (i_shift > 6)
             putb64();
     }
     while (i_shift > 0)
         putb64();
     while (out_len++ & 3)
         putchar('=');
     putchar('\n');
 
     return 0;
 }