/* * 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;}