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 25int 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