| 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 | } |